CN112601274B

CN112601274B - Method and device for detecting indication information

Info

Publication number: CN112601274B
Application number: CN202110026264.4A
Authority: CN
Inventors: 孙霏菲; 付景兴; 苏迪
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-07-31
Filing date: 2017-11-28
Publication date: 2023-06-06
Anticipated expiration: 2037-11-28
Also published as: CN112601274A

Abstract

The application discloses a method and apparatus for performing communication by a User Equipment (UE) in a wireless communication system, the method comprising: receiving configuration information including time domain information of the indication information via higher layer signaling; based on the time domain information, identifying a time interval between the indication information and a position of the UE starting to monitor a first physical downlink control channel, PDCCH, in a discontinuous reception, DRX, time; listening on a search space of a second PDCCH for receiving the indication information, wherein a time domain position 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

Method and device for detecting indication information

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

Technical Field

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

Background

For the internet of things IoT (Internet of thing) terminal, power consumption and battery life are very important. In a narrowband internet of things NB-IoT (narrow band IoT) or enhanced machine type communication eMTC (enhanced machine type communication) system, power saving for the terminal device can be achieved by configuring the power save mode PSM (power saving mode) or extended discontinuous reception eDRX (extended DRX). However, during sleep periods in PSM or eDRX mode, the UE cannot listen to paging messages. For some internet of things applications, the UE is required to 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 to a PSM or eDRX mode with longer periods.

In the enhanced version of Rel-15 NB-IoT and eMTC, it is decided to introduce wake-up or sleep signals/channels through learning studies in order to enable UEs to be paged while at the same time saving power. The wake-up signal/channel is used to wake up the UE, i.e. the UE needs 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 monitor the MPDCCH for indicating subsequent paging messages.

In a multi-carrier system, the carrier that carries the synchronization signal is referred to as 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 sending paging messages on non-anchor carriers is introduced. In eMTC system, a plurality of narrowband (narrow band) is defined, one of which has 6 PRBs, and the concept of paging narrowband is introduced. In addition, in an eMTC system, a downlink control channel MPDCCH for MTC is used to indicate paging messages, and different UEs may monitor the MPDCCH on different narrowband. Similarly, an ongoing new air interface NR (new radio) of 5G also has a scenario that the bandwidth of the UE is smaller than the system bandwidth, and multiple partial bandwidths (bandwidths) may 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 detection method of indication information, which can effectively realize equipment power saving.

In order to achieve the above purpose, the present application adopts the following technical scheme:

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 paging messages at one or more paging moments PO or indicates a downlink control channel of the paging messages;

and detecting the indication information on the determined carrier/narrowband position and the 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 location where the indication information is located includes:

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

or alternatively, the process may be performed,

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

or alternatively, the process may be performed,

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

Preferably, the preset carrier position is an anchor carrier;

And/or the number of the groups of groups,

the determining the carrier/narrowband location 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 number of the groups of groups,

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, there is an indication before each paging message or group of paging messages or each downlink control channel or group of downlink control channels; each piece of indication information is used for indicating whether all corresponding UE of one paging message or one downlink control channel monitors on PO corresponding to the UE or not; or, each indication information is used for indicating whether all corresponding UEs of 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 perform the monitoring on a PO corresponding to the part of UEs.

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

Preferably, there is more than one indication information 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 a PO 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 a starting or ending system frame SFN where the indication information is located according to the period of the indication information, and determining subframe position information of the indication information.

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

or determining a start or end system frame SFN of the indication information according to the period of the indication information, determining the start or end subframe position of the indication information, and determining the time domain position according to the start or end SFN and the start or end subframe position;

or determining the SFN where the indication information is located according to the period of the indication information, 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 start or end SFN of the indication information according to the period of the indication information, determining the start 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 start or end SFN, the start or end subframe position and the subframe information actually occupied.

Preferably, the determining the starting or ending 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 start or end subframe position of the indication information according to the period of the indication information includes: 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 the paging DRX period, or the period of the indication information and the paging DRX period are configured independently.

Preferably, the indicating information is used for indicating whether the UE listens for paging messages at one or more paging occasions PO or indicates a downlink control channel of the paging messages, and includes: and the indication information is positioned in front of any PO, the distance between the indication information and the PO meets the protection interval, and the indication information is nearest to the PO and is used 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 or the starting position or the ending position of the downlink control channel or the paging message includes:

determining the time domain position according to the position or starting position of the downlink control channel or paging message and the time domain resource information of the indication information; or alternatively, the process may be performed,

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

Preferably, the determining the time domain position according to the position or the starting 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 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 paging message and the subframe information actually occupied;

or determining the initial 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 initial position of the downlink control channel or paging message, the initial or ending subframe 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 occupied time of 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 a base station or is predefined.

Preferably, the repetition number of the indication information is determined according to the Rmax of the system configuration, where the Rmax is the maximum repetition number of the downlink control channel search space.

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

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

Preferably, the determining the start or end subframe position of the indication information includes: 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 subframe position of a predefined or base station configuration.

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

Preferably, the method further comprises: when the UE generates timing offset, calculating the SFN and the subframe number of the detected indication information, and carrying out timing synchronization again according to the calculated SFN and subframe number.

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

and/or, the method further comprises: carrying out channel estimation on a carrier wave/narrow band where the indication information is located 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 of the indication information; the indication information is used for indicating whether the UE monitors paging messages at one or more paging moments PO or indicates a downlink control channel of the paging messages;

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

As can be seen from the above technical solution, in the present application, the carrier/narrowband location and the time domain location where the indication information is located are determined; 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 occasions PO. And detecting indication information on the determined carrier 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 downlink control channel does not need to be monitored all the time, or the paging message is decoded, but the monitoring of the downlink control channel and the decoding of the paging message can be carried out only when the downlink control channel is required, so that the electricity saving of the equipment is effectively realized.

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 the indication information via higher layer signaling; based on the time indication information, identifying a time interval between the indication information and a position of the UE starting to monitor a first physical downlink control channel PDCCH in Discontinuous Reception (DRX) time; listening on a search space of a second PDCCH for receiving the indication information, wherein a time domain position 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 by a Base Station (BS) in a wireless communication system, the method comprising: transmitting configuration information including time domain information of indication information to User Equipment (UE) via high 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 position of the UE starting to monitor a first physical downlink control channel PDCCH in Discontinuous Reception (DRX) time; the indication information is transmitted 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: the apparatus includes means for receiving configuration information including time domain information of indication information via higher layer signaling, means for identifying a time interval between the indication information and a location where the UE starts listening to a first physical downlink control channel, PDCCH, in discontinuous reception, DRX, time based on the time indication information, means for listening to a second PDCCH on a search space of the second PDCCH for receiving the indication information based on the identified time interval, wherein the time domain location of the search space is determined based on the identified time interval, and means for identifying a wake-up indication included in the indication information in the second PDCCH.

A Base Station (BS) that performs communication in a wireless communication system, the BS comprising: the apparatus includes means for transmitting configuration information comprising time domain information of indication information to a user equipment, UE, via higher layer signaling, wherein the indication information comprises a wake-up indication, means for identifying a time interval between the indication information and a location where the UE starts listening to a first physical downlink control channel, PDCCH, in a discontinuous reception, DRX, time based on the time indication information, and means for transmitting the indication information to the UE via a second PDCCH over a search space of the second PDCCH, wherein the time domain location of the search space is determined based on the identified time interval.

Drawings

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

fig. 2 is a schematic diagram of the basic structure of the indication information detecting apparatus in the present application;

fig. 3 is a schematic diagram one of determining carrier/narrowband location of indication information;

fig. 4 is a schematic diagram two of determining carrier/narrowband location of indication information;

FIG. 5 is a schematic diagram I of determining a time domain position of indication information according to a period of the indication information;

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

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

fig. 8 is a schematic diagram one of determining a time domain location of indication information according to a paging location a;

fig. 9 is a schematic diagram two of determining a time domain position of indication information according to a paging position a;

fig. 10 is a schematic diagram III of determining a time domain position of indication information according to a paging position A;

fig. 11 is a schematic diagram IV of determining a time domain position of indication information according to a paging position A;

fig. 12 is a schematic diagram five of determining a time domain position of indication information according to a paging position a;

fig. 13 is a diagram six of determining a time domain location of indication information according to a paging location a;

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

Detailed Description

In order to make the objects, technical means and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings.

First, a relationship between the indication information and the paging signal in the present application is explained. In this application, the information transmitted by the wake-up or sleep signal or channel mentioned in the foregoing background art is referred to as indication information of the paging signal, where the indication information may be used to indicate whether the UE (herein denoted as UE) needs to monitor the 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 monitor the 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). Wherein, the downlink control channel is used for indicating a downlink data channel (PDSCH) carrying paging messages, and the downlink control channel and the downlink data channel may be different specific channels for different systems. For example, downlink data control channel (PDCCH), enhanced downlink data control channel (EPDCCH), MPDCCH, PDCCH of narrowband downlink control channel NPDCCH or NR, or narrowband downlink control channel NPDSCH. The downlink control channel and PDSCH may be on the same carrier or narrowband, or may be on different carriers or narrowband, where the carrier or narrowband on which the PDCCH or PDSCH is transmitted is called a paging carrier or paging narrowband, and may be predefined in the standard, or may be calculated according to a predefined method. Some parameters required in the calculation process can be configured through RRC. The carrier or the narrowband where the PDSCH is located may be further indicated by DCI, in addition to the above method.

For different systems, the downlink control channel may be transmitted on a carrier or narrowband. In eMTC system, the concept of paging narrowband (paging narrowband) is introduced, UE determines the narrowband where MPDCCH is located by the following formula (1), and UE listens to 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 PO in paging frame

Nn: number of paging narrowbands

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, the downlink control channel is transmitted on a carrier, further introducing weights on different paging carriers (carriers). The goal is to give the base station sufficient flexibility to adjust the paging load on each carrier. Especially considering NB-IoT UEs for Rel-13 and Rel-14 UE that do not support non-anchor carriers, paging channels can only be received from the anchor carrier (anchor carrier).

The smallest n satisfying the following formula is the paging carrier monitored by the UE:

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

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

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

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

The indication information is used for indicating whether the UE needs to monitor the paging message on one or more POs or indicating a downlink control channel of the paging message.

And 102, detecting the indication information at the determined carrier/narrowband position and the 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 application also provides a detection device for 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 of the indication information. And the detection unit is used for detecting the indication information at the determined carrier/narrowband position and the 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, it is described how to determine the carrier/narrowband location of the indication information.

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

Wherein the predefined carrier may be an anchor carrier.

The second method is as follows: the indication information is transmitted on the carrier/narrowband where the paging message or the downlink control channel (e.g., PDCCH) is located. The UE may obtain configuration information for transmitting the carrier/narrowband on which the paging message is located through higher layer signaling (e.g., SIB or UE-specific RRC message), thereby determining 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).

And a third method: 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 transmission of the indication information on a designated carrier/narrowband of the plurality of carriers/narrowband by configuration information of the base station. Wherein the designated carrier/narrowband may be one or more carriers/narrowband. Or, for example, the UE is informed of the carrier/narrowband location of the indication information by the configuration information of the base station in the manner of the first or second method. Preferably, whether the indication information is monitored only on the anchor carrier or whether the indication information is monitored on the non-anchor carrier may be configured through higher layer signaling. Its configuration method and calculation method may refer to the manner of multi-carrier paging in NB-IoT or eMTC. Furthermore, its configuration may be subordinate to or independent of the configuration of multi-carrier paging.

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

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

Several specific examples are given below.

For example, a method one is employed to determine the carrier/narrowband location of indication information indicating whether to detect PDSCH carrying paging messages on one or more POs and/or downlink control channels (PDCCH in the following examples) indicating their scheduling information. 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, carrier 1 is an anchor carrier). At this time, each UE monitors 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 a 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 the corresponding PO has no PDCCH or PDSCH transmission, the UE does not monitor the PDCCH or decode the PDSCH of the corresponding PO, and continues to detect the indication information on the time-frequency resource position of the next indication information 2. In the first period, if there is a PDCCH for indicating paging message or PDSCH transmission of the bearer paging channel on the POs of UE1 to UE3, the base station indicates that there is a PDCCH or PDSCH transmission on the corresponding PO by using the indication information 1. From the UE perspective, after detecting the indication information 1, the UE then continues to monitor the PDCCH on the corresponding PO or tries to decode the PDSCH. More specifically, if the POs of UE1 and UE2 are on carrier 1, UE1 and UE2 will continue to monitor the respective POs on carrier 1, and if the POs of UE3 is on the second carrier, UE3 detects indication information 1 on carrier 1, monitors the PDCCH for indicating paging signals on the corresponding POs of carrier 2, or decodes PDSCH on semi-statically scheduled resources. If the UE is a narrowband UE, e.g., NB-IoT UE, eMTC UE or narrowband UE in NR system, the UE re-adjusts the center frequency (return) to the carrier on which its PO is located (e.g., carrier 2), continues to monitor PDCCH or tries to decode PDSCH.

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

For example, the carrier/narrowband location of the indication information is determined by the method two, where the indication information is used to indicate whether there is a downlink control channel indicating PDSCH or PDSCH carrying paging message on one or more POs. Specifically, as shown in fig. 4, the UE acquires configuration information of a paging carrier or a paging narrowband; the indication information is determined to be transmitted on the paging carrier. It is assumed that the indication information 1 and the indication information 3 are transmitted on two carriers, carrier 1 and carrier 2, respectively. Paging carriers of UE1 and UE2 are carrier 1, and paging carrier of UE3 is carrier 2. At this time, UE1 and UE2 monitor the indication information 1 and the indication information 2 corresponding to the next indication information period on carrier 1, and UE3 monitors the indication information 3 on carrier 2. In one example, different carriers have different indication information/channel periods, e.g., indication information period on carrier 1 coincides with the DRX period, while indication information period on carrier 2 is an integer multiple, e.g., 2 times, of the DRX period. If the indication information indicates that there is a PDCCH transmission or a 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 carrier 1, if there is only one PDCCH transmission for indicating a paging message or PDSCH transmission carrying a paging channel on the PO of UE1, the base station indicates on indication information 1 that there is a PDCCH transmission or PDSCH transmission carrying a paging channel on the corresponding PO. From the perspective of the UE, after detecting the indication on the indication information 1, the UE continues to monitor the downlink control channel on its corresponding PO or tries to decode the PDSCH on the pre-allocated resources. 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, where the indication information 3 indicates whether there is PDCCH or PDSCH decoding in 2 POs in the period, and at this time, if the indication information is detected, the UE3 needs to detect two POs in its period if there is PDCCH transmission in the corresponding PO or PDSCH transmission carrying paging message on the semi-statically scheduled resource, 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 multiple POs or attempt to decode PDSCH.

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

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

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

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

The base station can configure different methods to determine the position of the indication information according to different requirements and scenes.

The time domain position refers to the 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 time slot position. The following description will take a system frame position and a subframe position as examples.

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 period of paging (e.g., by a DRX period of one or several times or several fractions of the DRX period) or unrelated (the period of the indication information and the period of DRX are independently configured, respectively).

In particular, 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, SFN satisfying SFN mod t2= (T2 div N) (ue_id mod N2) is a system frame of indication information, where T2 is a period of the indication information (which may be obtained by base station configuration), and N2 is a minimum value of periods T2 and nB 2. Where nB2 is a parameter of the higher layer configuration, for example, nB2 may take the value of: 4T2,2T2, 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 will correspond to a different SFN or subframe due to the different UE IDs. In fig. 5, in one indication period, different UEs may obtain the time domain position where the indication information 2 is located and the time domain position where the indication information 3 is located. Preferably, the method of calculating the indication information system frame may be independent of the UE ID, such as SFN mod t2=0. Further, when calculating the system frame where the indication information is located, it may be performed according to the initial offset of the system configuration. The starting offset may be cell-specific, or user group-specific. For example, SFN satisfying SFN mod t2=offset is a system frame indicating information. The offset is a starting offset, and may be specifically configured by an eNB (e.g. RRC), or may be predefined, or may be calculated by using a ue_id, and/or a carrier/narrowband ID, etc. Special offset=0, or T2-1 or T2-M, where M is a base station configured value. M may be a Duration (Duration) of the actual indication information transmission or a Duration of the actual indication information transmission plus one 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 indicated by indication 1 in fig. 5. For another example, in fig. 6, the period T2 of the indication information is the same as the paging DRX period T. At this time, it is convenient to define the transmission mode with the absolute SFN and/or the subframe number. In one DRX cycle, the POs (SFN and subframe number) of different UEs may be different, e.g. the POs of UE1 and UE2 are different, but are indicated by the same indication information in one DRX cycle, i.e. the indication information cycle. The offset may also be combined with the first way to determine the system frame in which the indication information is located. Specifically, one offset value may be offset on the basis of the SFN calculated using 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 method, the initial system frame SFN where the indication information is located can be determined according to the period of the indication information. In the specific implementation, after determining other system frames where the indication information is located, determining the subframe position where the indication information is located by adopting a subsequent mode B, where the specific processing mode is introduced together in the mode B.

In order to keep the low complexity terminal, a certain time is reserved between the indication information and the paging location a, i.e. the PO, for the UE to detect the indication information. Then for the indication information that has no time interval with the PO, the UE cannot quickly determine whether the PO immediately following the indication information exists in the downlink control channel or the downlink data channel carrying the paging information, where the PO may be defined as being indicated by the previous indication information (i.e., nearest to the PO and satisfying the guard interval). As shown in fig. 7, since there is not enough Guard Period (GP) between the indication information 2 and the paging location A1, whether the PDCCH exists at the paging location A1 is indicated by the previous indication information 1.

The above is a method of determining the SFN in which the indication information is located in the case a. 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 can determine the paging position A (SFN and subframe) according to the prior art, and further determine the time domain position of the indication information according to the time domain resource information of the indication information or further according to the subframe position information of the indication information. As shown in fig. 8, the base station sends an indication message before each paging message or the downlink control channel indicating the paging message. As shown in fig. 8, UE1 and UE2 respectively calculate respective paging positions a, i.e., POs, according to predefined criteria and configured parameters, and are applicable to UE1 in indication information 1 and indication information 3, and are applicable to UE2 in indication information 2 and indication information 4.

Preferably, there are two specific ways of processing:

1. and determining time domain resource information of the indication information, and determining the 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 the protocol. In more detail, when determining the time domain position of the indication information according to the time domain resource information of the indication information and the paging position A, determining the time domain position of the indication information according to the repetition number 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 position a, the time domain position where the indication information is located may be determined only according to the repetition number of the indication information and the time length occupied by the indication information. The time interval between the indication information and the paging position a may be the number of available subframes or the number of absolute subframes, or the number of available subframes plus one absolute subframe (time). Further, a subframe may be a slot or other time unit.

The number of repetitions of the indication information in the time domain resource information may be estimated from the maximum number of repetitions Rmax in the PDCCH search space indicating the 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, e.g. defined in a standard. X may also be configured by the base station. Furthermore, the UE may need to listen to one or more channels or signals carrying indication information for a possible number of repetitions, which may need to be monitored for the number of repetitions, or the maximum number of repetitions may be configured by the base station or specified in the protocol. Specific designs may refer to the design of MPDCCH or NPDCCH search spaces. Then the start position of its indication information may be determined by the maximum number of repetitions. Different starting points can be found according to different repetition times.

2. Determining the 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.

In the above-described embodiment a, the subframe position information of the instruction information is also determined, and in the present embodiment, the subframe position information may be the same as the subframe position information in the above-described embodiment a, and the determination method may be the same. Therefore, the description is made below together.

In particular, the subframe location information of the indication information may include a starting subframe location of the indication information and/or actually occupied subframe information.

When the subframe position information of the indication information includes the starting subframe position, it may be determined in several ways as follows:

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

The UE may directly calculate the starting subframe position for transmitting the indication information through a predefined rule. Specifically, the method of paging subframes in LTE may be adopted, that is, determined by a table defined in advance with UE ID and n2=min (T2, nB 2), and specifically: i_s2=floor (ue_id/N2) mod Ns2. Where T2 is an instruction information period, nB2 is a parameter configured by a higher layer, ns2=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.

Predefined: for example, the starting subframe location is fixed as one or more subframes, such as subframe 9 (avoiding NSSS in NB-IoT systems) per odd frame, or as subframes 3,4,9, or the first subframe of each SFN, subframe 0.

RRC configuration: the base station may specifically configure the subframe number. The specific subframe number may be the indicated starting subframe position. The actually occupied subframe position may be from the start 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 determining the initial subframe position in the above manner, for the manner a, the SFN and the initial subframe position may be combined to determine the time domain position where the indication information is located; for the mode B, the time domain position where the indication information is located may be determined by combining the paging position a and the starting subframe position, for example, a starting subframe position which is closest to the paging position a before the paging position a and can complete transmission of the indication information with the starting subframe of the downlink control channel or the PDSCH carrying the paging message is used as the starting subframe position 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 alternatively

Wherein n is _f Index of SFN, n _s For time slot index, i.e.)>

Is a subframe index. In the above formula, the offset value may be a value configured independently 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 and the paging location a, and may further be calculated from the available subframes. The method of calculating the subframe start position is not applicable to the method B but only to the method a.

The subframe position information of the indication information may further include subframe information actually occupied by the indication information. When the indication information is transmitted, the transmission may need to be repeated for multiple times, 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 may need to be determined, so as to finally determine the time domain position occupied by the indication information.

Specifically, the actually occupied subframe information may refer to: the indication information may occupy only the available subframes of the downlink, or the indication information may occupy only the partially specified unavailable subframes of the downlink.

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

(a) The subframe is not used for NPSS/NSSS/NPBCH/NB-SIB1 transmission, and other SIB transmissions

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

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

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

The advantage of transmitting the indication information in the partially unavailable subframes in the downlink is that the potential collision between the transmission of other signals of the UE of the previous version (note: the UE of the previous version does not know the transmission of the indication information) and the transmission of the new indication information can be effectively avoided. This approach is more applicable to the case of connected mode.

When determining the time domain position of the indication information according to the paging position a in the above manner B, each paging position a is referred to before having an indication information for indicating whether to monitor at the corresponding position. Specifically, the above situation may be that one indication information indicates whether the UE corresponding to one paging location a needs to monitor, or that one indication information indicates whether some UEs among all UEs corresponding to one paging location a need to monitor. Such a case is described in detail below.

As shown in fig. 6, the method may also be implemented by using the B method, for example, each group of UEs (including UE1 and UE 2) has a PO in front of it to transmit an indication, and the location a of the indication is determined according to the location of the PO of the first UE in the group of UEs, i.e. UE 1. At this time, the first UE in the group of UEs may be calculated 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=n×ns (where n×ns represents the number of POs in each DRX cycle), 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, i.e. a plurality of indication information corresponds to one PO, so that UEs in each PO need to be further grouped; when Y < n×ns, it indicates that a plurality of POs correspond to one indication information in one DRX cycle. In particular, when y=1, i.e. there is only one indication per DRX cycle, for indicating UEs on all the carriers. For the case of Y > n×ns, the time domain position of the indication signal may be determined in a manner of grouping UEs further as described later.

For the case of Ns >1, it may be difficult to find the indication signal position before each PO, in which case the PO described above may be replaced by a PF, and then the number of PFs N replaces the number of POs n×ns in each DRX cycle 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=1, for the case of Y < N, the UE of multiple POs needs to find the same location of the indication information. The specific implementation method comprises the following steps:

group number y=ue_id mod Y of the indication information.

The position of one PF nearest to the indication information is (tdiv N) floor ((ue_id mod N)/(Y/N))floor (Y/N). The location of the first PO of the PF is paging location A. The time domain position of the indication information may be continued to be judged according to the following method.

For mode a, the time domain position of the indication information may be determined in combination with the SFN, the starting subframe position of the indication information and the actually occupied subframe information. For mode B, the time domain position of the indication information may be determined in combination with the paging position a and the actually occupied subframe information, or the time domain position of the indication information may be determined in combination with the paging position a, the starting subframe position of the indication information, and the actually occupied subframe information.

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 the paging location a, that is, the SFN where the PO is located and the subframe, such as sfn=m, subframe k, where the PO is the start location in case there is a repetition of the downlink control channel indicating the paging message or the downlink data channel carrying the paging message. And then, the UE determines the initial subframe of the indication information as the subframe k-N according to the number N of subframes occupied by the indication information or the interval between the initial subframe of the indication information and the paging position A. In practice, the actual subframe number range may be only 0-9, and SFN needs to be introduced for calculation. For example, the position of PO is sfn=m subframe number k, where k=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 the standard.

As shown in fig. 10, the UE determines the paging position a, that is, SFN N and subframe k where PO is located, and determines that the starting subframe of the indication information is 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 position a. In one example, there are N available subframes in total from m to k. Furthermore, in order to guarantee low complexity of the UE, to ensure 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, may be reserved between the indication information (end position in case of repetition) and the paging position a. Especially when different hardware units are adopted for PDCCH decoding and indication information detection, a certain time is reserved for waking up a new hardware unit.

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

If the UE is in idle state, either CSI-RS (Channel State Information Reference Signal) or PRS (position reference signal) is not visible to the UE (transmission), i.e., the UE may assume that there is no CSI-RS and no PRS transmission. From the perspective of the base station, when the CSI-RS and the indication channel/signal are transmitted at the same time-frequency resource position, the indication channel/signal is punched, namely, the indication channel/signal is not transmitted by the transmission CSI-RS. Furthermore, 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 PRS or CSI-RS as an unavailable subframe. Or the UE considers that the indication channel/signal will puncture or rate match the CSI-RS, thereby ensuring performance.

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

Preferably, the symbol may be predefined: for example, all symbols within one subframe, or the first three OFDM symbols within one subframe. The first three OFDM symbols of anchor carrier subframe 0,5,9 (even frame) are idle due to NB-IoT system, stand alone deployment mode. Thus, these three OFDM symbols may be used to transmit the indication information/channel.

The above gives a way of determining the time domain position where the indication information is located. Further, with the location information of the indication information as above, when the UE is timing-shifted (out of synchronization), values of SFN, subframe, and 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 of SFN mod 256=0. After the UE is out of synchronization, the location where the indication information was successfully detected may be set to the SFN in the UE memory and/or the value of the subframe is the nearest one. Such as sfn=0 and the position of subframe 0. That is, the UE may re-synchronize timing through the indication information, and a time-dependent counter in the UE memory.

Pilot signals, such as CRS of an LTE system or NRS of an NB-IoT system, need to be avoided when indicating information resource element (resource element RE) mapping. Since in NB-IoT idle state, anchor carrier specific subframes, and non-anchor carriers, the presence of NRS need to be assumed on the first few subframes of each PO, and the presence of NRS need not be assumed on the other subframes. At this time, the indication information may be mapped on REs that originally transmit NRS, i.e., assuming no transmission of NRS. This can better maintain the correlation of sequences and improve the detection performance. When the transmission format of the indication information is a channel, it is assumed that NRS is present consistently in its transmission subframe, and the UE needs to perform channel estimation and decoding of the indication channel through the NRS. Further, the UE may assume that several subframes exist all the time before the indication channel transmission subframe, and the UE may perform frequency offset estimation through NRS, etc.

For NB-IoT systems, the UE may decide mobility in idle state, e.g., cell attach or reselection, through channel state indicators such as RSRP and/or RSRQ and/or RSSI of the anchor carrier. The channel state of the carrier RSRP can be easily obtained if the UE only needs to monitor the indication information or channel at the anchor carrier. In particular, due to the limitation of the RF capability of the base station, power boosting (power boosting) may be performed on the anchor carrier only, and if all UEs are monitoring the indication information on the anchor carrier, the same mobility management criteria, such as the same RSRP threshold, may be used to perform cell attachment or reselection. For example, in NB-IoT systems, idle state mobility management is determined in accordance with the channel state of the anchor carrier. Similarly, the indication information may be used in eMTC, NR, LTE and 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 is better than that of the non-anchor carrier/narrowband, for example, the anchor carrier/narrowband can perform Power boosting of 6dB, and the transmission duration (or the repetition number, or the occupied time-frequency domain resource, or the sequence length) of the required indication information is shorter, for example, only 1/4 of the length is required. This is more advantageous for power saving of the UE. However, an indication information of the method indicates whether paging messages exist on multiple carriers, if the paging traffic of the cell is busy, the UE is frequently awakened, and the meaning of power saving is lost. In case of heavy paging traffic, the indication information/channel indication may be transmitted on each carrier separately whether or not a paging message is present. Preferably, the base station may configure the period (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 the UE of the same PO may be grouped according to the UE ID even further by the indication information, that is, as described above, when the number of groups Y > n×ns of the UE, it indicates that a plurality of indication information corresponds to one PO position, so that the UE 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 UE IDs, and respectively correspond to instruction information 1 and instruction information 2. 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, 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, respectively. As shown in fig. 11, the UE deduces 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 the indication information 1, configuration { transmission duration 1, interval 1 with position a }; for the indication information 2, a { transmission duration 2, interval 2 with position a }. 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 transmission duration with the position a. Since the UE wakes up from IDLE state and possibly has a certain time offset from the base station, an interval is required for every two adjacent sets of indication information in order to avoid detecting other PO indication signals. Alternatively, at least two adjacent sets of indication information employ different sequences to reduce the false alarm probability. In another example, the start position of the indication information 1 may be determined according to the interval between the indication information 2 and the PO, the transmission time period of the indication information 2, the interval between the indication information 1 and the indication information 2, and the transmission time period of the indication information 1. But this method is more complex than the former method.

Furthermore, the above-described method for determining the time domain position of the indication signal may be applicable to the case of further grouping UEs by performing multiple groups of configuration by the base station.

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

PF is SFN satisfying SFN mod t= (tdiv N) (ue_id mod N). Where n=min (T, nB), T is the DTX period and nB is the RRC parameter configured by the base station.

PO is i_s satisfying i_s=floor (UE_ID/N) mod Ns, ns=max (1, nB/T), and PO is obtained according to a table look-up mode.

As described above, to reduce the probability of the UE being awakened (due to paging other UEs), UEs belonging to one PO may be further divided into M groups. The UE may determine, according to the configuration of the base station, the packet m to which the UE belongs first, and then further determine, according to the above method, the time domain resource location of the indication signal. For example, the group number may be determined from the UE ID: m=floor (ue_id/n×ns) mod M. For the details, as shown in fig. 11, m=2, n=4, then UE with UE ID 0 belongs to the first group of PO1, UE with UE ID 4 belongs to the second group of PO1, UE with UE ID 1 belongs to the first group of PO2, UE with UE ID 5 belongs to the second group of PO2, and so on.

For systems supporting multiple carriers/narrowband, for example:

pnb=floor (ue_id/(n×ns)) mod Nn for eMTC system, where PNB is the number of narrowband, nn is the number of paging narrowband.

At this time, in the first specific scheme, the number m=floor (ue_id/n×ns)/Nn) mod M further grouped with UEs belonging to one PO.

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

At this time, in the second group of embodiments, m=floor (ue_id/n×ns)/W) mod M.

In addition, in addition to transmitting multiple indication signals for the same group of POs at different time domain positions in sequence, a subset in each PO may be indicated by a method of configuring multiple sequences. Alternatively, multiple indication signals may be transmitted alternately over different time units (e.g., subframes, or primary sequence transmission units) for better time diversity gain. In both cases, the start position of each corresponding different indicator signal in one PO may be determined by the same parameter or method, and then the actual time domain resource position of each indicator signal is determined according to a predefined rule (e.g., each subframe, or each sequence is transmitted alternately). As shown in fig. 12, the indication signals 1 and 2 are alternately transmitted, and the UE may determine a time domain start position according to the base station configuration, and further determine a time domain transmission position of the indication signal to be monitored. For the above configuration information for further grouping 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 broadcasted in System Information (SIB), or configured directly by MME through UE-specific RRC signaling, or through higher layer (NAS) signaling, etc.

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

Since the transmission of the indication information needs to occupy additional downlink resources, in order to reduce the downlink resource occupation, at the same time, whether to use more resources for paging can be determined according to whether paging is successful, so that the concept similar to the concept of PDCCH search space can be supported. That is, the base station may configure the maximum indication information transmission duration (or the number of repetitions), 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 point of view, the detection position can be determined according to the downlink channel state (coverage condition). 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 required is shorter, and detection may begin from detection position 3. It is also possible to start the detection just from the detection position 2, i.e. to actually indicate the signal transmission position. If the UE starts to detect from the detection position 1, the probability of successful detection may be low, and if the base station does not receive the random access request of the UE, the maximum transmission duration may be selected to transmit the indication information to ensure the detection performance at the next PO. However, it is possible that a UE with poor coverage can successfully detect the indication information of only N' sub-stations, compared to the base station transmitting the indication information due to overhead consideration of the system.

Furthermore, in order 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. a certain time interval (predefined or base station configured by RRC) is met with the PO. Thus, if the UE needs a shorter detection time, it may wake up later, thereby saving more power. In addition, the design of the end position alignment can reduce the probability of transmitting PDCCH or PDSCH in the previous PO. Under this design, the UE determines a 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 based on the length of time it needs for its actual detection. Specifically, the UE determines the position of the indication information for starting to detect by the UE according to the duration and the guard time interval required to detect. If the position is before the earliest possible transmission start position, 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, skipping the indication information and directly detecting the PDCCH. Further, the UE may decide an actual detection position according to the available subframe information.

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

If the UEs of one PO are further divided into two or more groups, as shown in fig. 11, the UE monitoring the first indication information needs to wake up to detect the position according to the earliest possible transmission start position of the second indication information, and further calculates the position (according to the detection duration required by the UE) of the UE. 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 required to be reserved between the two information, and then finally determines the position of the start detection indication information of the UE 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 measured value of RSRP or RSRQ or RSSI by measuring CRS signals, and/or NRS signals, and/or the indication information or channel, and/or synchronization signals, and/or channels or signals such as downlink broadcast channels (e.g., PBCH or SIB 1) on the carrier. In addition, in order to measure a channel state through the indication information or the channel, the UE needs to obtain a power difference of the indication information or the channel from other pilot signals. The power difference may be predefined in the protocol or configured by RRC signaling. In particular, the protocol may specify a default value and further configure other values via RRC. Further, for joint measurement, the indication information or channel may be transmitted through one or more antenna ports. For example, the indication information may be defined to use the same antenna port as SSS or PSS, or the signal or channel may be defined to use the same transmission format and antenna port as PBCH, or the signal or signal may be defined to have a one-to-one correspondence with CRS or NRS or DMRS. For a multi-antenna system, when the indication information is transmitted between different units (such as different repetition and different subframes), different antenna ports can be assumed. Further, the signal or channel may be used to perform channel estimation to help improve demodulation performance of subsequent downstream channels.

Further, to support measurement of neighbor cells, the base station may configure indication information of neighbor cells. The UE may obtain configuration information of the neighbor cell indication information, such as a time-frequency resource location, a period location, a start location, carrier information, an indication information sequence, or a neighbor cell ID, etc., through system information or other RRC signaling. The UE may obtain the channel state of the neighbor cell(s) by measuring the indication information of the neighbor cell(s), e.g., RSRP, RSRQ, RSSI, etc.

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

Fig. 13 shows 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 terminology 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. a cell or cell sector area. In some systems, one or more BSs are communicatively coupled (coupled to) to a controller forming an access network, the controller being communicatively coupled to one or more core networks. The present disclosure is 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 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 (Orthogonal Frequency Division Multiplexing, OFDM)/orthogonal frequency division multiplexing access (Orthogonal Frequency Division Multiple Access, OFDMA) system including a plurality of base stations including base station 101, base station 102, and a plurality of UEs including UE 103 and UE 104. Base station 101 communicates with UE 103 via uplink communication signals 111 and downlink communication signals 112. When a base station has downlink packets to send to UEs, each UE obtains a downlink allocation (resource), such as a set of radio resources in a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) or a narrowband downlink shared channel NPDSCH. When the user equipment needs to send a packet in uplink to the base station, the UE obtains an grant from the base station, wherein the grant allocation contains a physical downlink uplink shared channel (Physical Uplink Shared Channel, PUSCH) or a narrowband uplink shared channel NPUSCH of 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 are referred to as downlink control information (Downlink Control Information, DCI). Fig. 11 also shows different physical channels for the 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 (Physical Control Formation Indicator Channel, PCFICH) 123, a physical multicast channel (Physical Multicast Channel, PMCH) 124, a physical broadcast channel (Physical Broadcast Channel, PBCH) or narrowband physical broadcast channel NPBCH125, a physical hybrid automatic request retransmission indicator channel (Physical Hybrid Automatic Repeat Request Indicator Channel, PHICH) 126, and a primary synchronization signal (Primary Synchronization Signal, PSS), a second synchronization signal (Secondary Synchronization Signal, SSS), or a narrowband primary-secondary synchronization signal NPSS/NSSS127. The downlink control channel 121 transmits a downlink control signal to a user. DCI 120 is carried over downlink control channel 121. PDSCH122 transmits data information to UEs. PCFICH 123 transmits information for decoding PDCCH, such as a number of symbols dynamically indicating the number of symbols used by PDCCH 121. PMCH 124 carries broadcast multicast information. The PBCH or NPBCH125 carries a master information block (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 receives the transmission signal thereon. The uplink 111 includes a physical uplink control channel (Physical Uplink Control Channel, PUCCH) 131, a PUSCH132, and a physical random access channel (Physical Random Access Channel, PRACH) 133 carrying random access information.

In one embodiment, wireless communication network 100 uses an OFDMA or multicarrier architecture, including adaptive modulation and coding (Adaptive Modulation and Coding, AMC) on the downlink and a next generation single carrier FDMA architecture or multicarrier OFDMA architecture for UL transmissions. FDMA-based single carrier architectures include Interleaved Frequency Division Multiple Access (IFDMA), localized FDMA (LFDMA), IFDMA, or extended discrete fourier transform orthogonal frequency division multiplexing (DFT-spread OFDM, DFT-SOFDM) of LFDMA. In addition, various enhanced Non-interleaved multiple access NOMA architectures of the OFDMA system are included, such as PDMA (Pattern division multiple access), SCMA (Sparse code multiple access), MUSA (Multi-user shared access), LCRS FDS (Low code rate spreading Frequency domain spreading), NCMA (Non-orthogonal coded multiple access), RSMA (Resource spreading multiple access), IGFA (Interleave-grid multiple access), LDS-SVE (Low density spreading with signature vector extension), LSSA (Low code rate and signature based shared access), NOCA (Non-orthogonal coded access), IDMA (Interleave division multiple access), RDMA (Repetition division multiple access), GOCA (Group orthogonal coded access), WSMA (Welch-bound equality based spread MA), and the like.

In an OFDMA system, a remote unit is served by allocating downlink or uplink radio resources, which typically contain a set of subcarriers over one or more OFDM symbols. Example OFDMA protocols include the LTE and IEEE 802.16 standards of the evolution 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 code division multiple access (multi-carrier direct sequence CDMA, MC-DS-CDMA), orthogonal frequency code division multiplexing (Orthogonal Frequency and Code Division Multiplexing, OFCDM) for one-or two-dimensional transmission. Alternatively, it 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 foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.

Claims

1. 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 the indication information via higher layer signaling;

based on the time domain information, identifying a time interval between the indication information and a position of the UE starting to monitor a first physical downlink control channel, PDCCH, in a discontinuous reception, DRX, time;

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

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 PDCCH during a time before the UE starts monitoring a location of the first PDCCH in the DRX time.

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

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 by a base station BS in a wireless communication system, the method comprising:

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

the indication information is transmitted 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, PDCCH need not be monitored by the UE during a time before the UE starts monitoring a location of the first PDCCH in the DRX time.

7. The method of claim 5, wherein the second PDCCH is listened to 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, performing communication in a wireless communication system, the UE comprising:

a module configured to receive configuration information including time domain information of the indication information via higher layer signaling,

a module configured to identify, based on the time domain information, a time interval between the indication information and a location where the UE starts listening to a first physical downlink control channel, PDCCH, in a discontinuous reception, DRX, time,

means configured to listen to a second PDCCH on a search space of the second PDCCH for receiving the indication information, wherein a time domain position of the search space is determined based on the identified time interval, and

and a module configured to identify a wake-up indication included in the indication information in the second PDCCH.

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

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

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, performing communication in a wireless communication system, the BS comprising:

a module configured to send configuration information comprising time domain information of indication information to a user equipment, UE, via higher layer signaling, wherein the indication information comprises a wake-up indication,

means configured to identify, based on the time domain information, a time interval between the indication information and a location where the UE starts listening to a first physical downlink control channel, PDCCH, in a discontinuous reception, DRX, time, and

the apparatus includes means for transmitting the indication information to the UE via a second PDCCH over 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, PDCCH does not need to be monitored by the UE during a time before the UE starts to monitor a location of the first PDCCH in the DRX time.

15. The BS of claim 13, wherein the second PDCCH is listened to 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.