KR20190017620A - Method and apparatus for radio link failure handling in the system using multiple reference signals - Google Patents

Abstract

The present disclosure relates to a communication technique for fusing a 5G communication system with an IoT technology to support a higher data transmission rate than that of a 4G system, and a system thereof. The present disclosure can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security- and safety-related services, etc.) based on a 5G communication system and an IoT-related technology. The present invention discloses an event detecting a radio link failure in a millimeter-wave (mmW) system. A control signal processing method in a wireless communication system comprises the following steps: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the process to the base station.

Description

METHOD AND APPARATUS FOR RADIO LINK FAILURE HANDLING IN THE SYSTEM USING MULTIPLE REFERENCE SIGNALS [0002]

The present invention relates to an event detecting a Radio Link Failure in an mmW system.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered connection network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

On the other hand, a method of finding a radio link failure is as follows. In case of existing LTE, the DL signal is monitored based on the CRS to detect the signal strength corresponding to the time frequency position of the cell reference signal for a specific time, and this intensity is averaged over a specific time period to correspond to a given SINR or SNR , It indicates to the upper layer that a DL radio link problem occurs.

The definition of radio link failure is different from the fast beam tracking of scheduling and the beam management of RRM for cell mobility. It is determined whether the link condition with the corresponding cell is good or not in a longer time range, Is the process of retrying itself. Generally, the process of reattaching to the cell starts from the cell search and performs the RACH and security related operations again. Therefore, it also involves work in the CN as well as in the radio. It is also necessary to send and receive data between the cells that have been reattached and those that have failed in the past. It is general to give the maximum monitoring time long considering the cost of this RRC reestablishment process.

In the case of Omni directional radiation, when measuring the strength of the time / frequency resource of the CRS, the effects of multipath are all taken into account. Once you measure, you already have an affecting element for directionality. Therefore, only time changes (how long the meaure will be merged, just averaging, averaging with moving avege, etc.) affect the measurement variation.

In the case of the mmW system, the reference signal (RS) must be transmitted on the analog beam because the radio link measure must be performed on all terminals in the coverage of the cell, rather than in the omni directional. Depending on the situation of the system, this analog beam may be multiplexed at the same time and may perform one transmission at a time. There may be a RS in the scheduled beam, and a measurement time slot containing a separate measurement signal. In the case of Omni, contrast and orientation are another axis affecting RLF decision. It is therefore an object of the present invention to newly define an event for transmitting a radio link problem to a higher layer through a combination of a specific analog beam indicating the directionality and a time axis.

According to an aspect of the present invention, there is provided a method of processing a control signal in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting the second control signal generated based on the process to the base station.

According to an embodiment of the present invention, there is an effect of defining an event for transmitting a radio link problem by providing a method of determining out of sync and in-sync according to the RS.

1 is a view showing an example of a measurement slot.
FIG. 2 is a diagram showing an example in which a measured value of an additional scheduled beam is added to a sample in addition to a measure of an existing measurement slot for a specific time.
3 is a diagram illustrating an example of transmitting SS by using a plurality of data transmission TX beams at the same time.
FIG. 4 is a diagram illustrating an example in which a base station constructs a separate reference signal for data TX beams forming a corresponding SS and transmits the resultant signal together with the information to the UE for the report of the SS result measured sequentially.
FIG. 5 illustrates the difference in RLM operation that occurs while operating a beam in NR versus LTE.
6 illustrates signaling to a base station using radio link monitoring of an xSS according to an embodiment of the present invention.
FIG. 7 is a diagram showing an example of adaptively operating the T_in value with respect to the number of operating beams.
FIG. 8 is a diagram illustrating an example in which an offset value is set for each DL TX beam, the value is transmitted to the system information by the base station, and the terminal is used every time the DL TX beam set is set.
FIG. 9 illustrates an example of transmitting offset information per beam through an RRC dedicated message. FIG. 10 illustrates a process of transmitting relevant offset value information to a physical layer control channel.
11 is a diagram showing an example of a case where relevant offset information is transmitted to the MAC CE.
FIG. 12 is a diagram illustrating a method in which a physical layer provides an indication to an upper layer (RRC) for each RS according to an embodiment of the present invention, or provides a combined indication.
13 is a diagram for explaining a case where the terminal CSI-RS is not the IS and the related SS is not the IS.
FIG. 14 is a diagram for explaining a case where a policy that prioritizes the CSI-RS to the RLM is set up at the moment when the CSI-RS is configured at a specific point in time after the RLM is performed through the SS according to an embodiment of the present invention .
FIG. 15 is a diagram for explaining a case where a policy for RLM preference of the CSI-RS is set at the instant when the CSI-RS is configured at a specific point in time after performing the RLM through the SS.
16 is a diagram illustrating an operation of a base station using a specific bandwidth part according to capability and service requirement of the terminal.
FIG. 17 is a diagram illustrating an example in which UE beam forming related capability information, required service feature related information, preferred bandwidth part information, and the like are transmitted in separate RRC messages after establishing a connection setup.
18 is a diagram illustrating a case where an RLM-RS according to an embodiment of the present invention exists in only one frequency region.
19 is a diagram for explaining RLM-RS signaling when the active BWP has RLM-RS and when not.
20 is a diagram illustrating a case where an RLM-RS according to an embodiment of the present invention exists in a plurality of frequency bands.
21 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.
22 is a diagram illustrating a structure of a UE according to an embodiment of the present invention.
23 is a view for explaining an operation in the case where the RLM / RLF parameter is set differently according to the type of service received by the terminal.
FIG. 24 is a diagram for explaining an operation in which a target cell receives service information of a corresponding UE from a serving cell and transmits an RLM RS setting, a BLER setting information, and an RLF parameter to a serving cell based on the received service information.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The measurement source can be used both to measure the RS of the measurement slot, to measure the RS of the scheduled beam, and to measure the DMRS value of the PDCCH, as shown below. . In this specification, the difference of the CRS relative to the beam measurement RS (BRS) is a measurement RS mounted on an analog beam, and is used when two or more analog beams disjointly cover the cell coverage for serving one cell. The beam and the beam are used to measure the RSRP / RSRQ / RSSI.

[First embodiment: when considering only the RS in the measurement slot (only the SS is set)]

The measurement slot shown in Fig. 1 can be considered. In the beam sweeping slot, the eNB TX transmits the BRS for each beam, and sequentially sweeps the beam. While an eNB is TX sweeping, RX receives a specific beam and measures the BRS. Other cases are possible. For example, if the eNB TX repeatedly transmits a BRS on the same beam, the UE RX beam may sweep. This method corresponds to both the source variation of all RSs proposed herein and the case of determining In-sync. In any case, if the combination of all TX and RX beams makes a measurement term 1, then the specific time mentioned below can be a number of terms.

A. [By 1TX-1RX beam pair calculation] When using the values per term separately: N best of the measured values of all TX-RX beam pairs measured without beam for a specific time. RX pair of term 2 and the measurement value of the same TX-RX pair of term 2 are treated differently when the measurement value is smaller than the threshold, i.e., the measurement value of the pair of TX-RX of term 1 and the measurement value of the same TX- If the value of N best is less than the out of sync (OOS) threshold.

B. [1 TX-M RX Beam Pair Calculation] When using the values for each term separately: first select the M RX beam for each TX beam for a specific time period, and then measure the multiple RX beams for that TX beam The average or linear combination of the values. And treats the average (or linear combination value) of each TX as a different value for each term, which means that the N best values are lower than the OOS threshold based on the calculated value of the total TX. At this time, M may be given or may be selected for each UE based on a specific metric.

C. [1TX-1RX beam pair calculation] When the value of each term is used separately: Derive the average of the N measures selected in the case of A above, or take a linear combination lower than the OOS threshold time.

D. [1 TX-M RX Beam Pair Calculation] When the value of each term is used separately: when it is lower than the average of the N measurement values selected in the above case B or the linear combination OOS threshold. At this time, M may be given or may be selected for each UE based on a specific metric.

E. [1TX-1RX beam pair calculation] For the term wise average: For a TX-RX beam pair measured during a certain time, the best N beam pair of linearly combined values per term-wise beam pair All values do not exceed the OOS threshold. At this time, M may be given or may be selected for each UE based on a specific metric.

F. [1 TX-M RX Beam Pair Calculation] For the term wise average: Using the linear combination of the measurement values of the M RX beams for each TX beam for each term, the term-wise If the N best value of each TX beam corresponding to the linear combination is less than the OOS threshold. At this time, M may be given or may be selected for each UE based on a specific metric.

G. [Calculated by 1TX-1RX beam pair] When the value of the best N beam pair is taken again in the case of E, this value does not exceed the OOS threshold. Where M may be given and may be selected per UE based on a particular metric.

H. [1 TX-M RX Beam Pair Calculation] When the value of N best calculated from F is smaller than OOS threshold. At this time, M may be given or may be selected for each UE based on a specific metric.

[Second embodiment: when RS exists in the scheduled analog beam other than the measurement slot (when CSI-RS exists)] [

In this case, the RS resource location information must already be shared with the corresponding scheduled TX beam.

Referring to FIG. 2, in addition to a measure of an existing measurement slot, a further scheduled beam measurement value is added to a sample during a specific time. In the remaining method, the above-described case (A.H) is applied as it is in the first embodiment. Since the TX beam scheduled at the BRS measurement result and the measurement of the received RX beam at that time are added in the case of the first embodiment, the measurement value of the corresponding TX-RX beam pair added at the time of performing each calculation is added do.

For example, a plurality of BRSs may be simultaneously transmitted to serve as a synchronization signal (SS). A subset of the TX beams for the data transmission of the base station can be simultaneously radiated for one SS transmission. In this case, the SS is measured and the TX beam is refined again as a result, Beam. In this case, the reference signal indicating the PDCCH hypothesis transmission may be the SS itself or the data TX beam forming the SS.

Referring to FIG. 3, SS is transmitted using a plurality of (three in this example) TX beams for data transmission as a composite beam. It is the same synchronization signal that is transmitted through this beam. In the coverage of this beam, the terminal sees the same sync signal. By measuring the SS transmitted through this composite beam, the UE adjusts the timing sync with the cell. At the same time, we perform a measurement to find the data TX beam in one composite beam, and find the data TX beam needed for the terminal in the composite beam.

Referring to FIG. 4, when the SS is sequentially measured and the result (the SS having the strongest received signal strength in this example) is reported, the BS adds a separate reference signal (here, additional) to the data TX beams constituting the SS RS, abbreviated as aRS), and transmits the information to the terminal. The terminal receiving the information measures the aRS constituting the SS, reports the value to the base station, and determines the beam for the final data / control TX. When the BS transmits the determined value to the UE, the UE recognizes that the corresponding beam is its DL TX beam. And receives the data / control with that beam. In this process, the OOS / IS determining RS may be either SS or aRS, or only one of them may be used. In this specification, aRS and CSI-RS are used in an intersecting manner.

If only SS is used, it can be used in consideration of SS instead of BRS in the method of OOS determination of BRS No. 1 in this specification. The following shows the signaling of the necessary information when using only the SS.

The following is a description of the beam-by-beam measurement in other respects.

For LTE radio link monitoring, if the Q_out threshold is not exceeded for T_out = 200ms, an OOS indication is generated. In this case, since RS is generated for each symbol in every subframe, it will be measured at different points in time and will have various values measured for 200 ms. Since it is a UE implementation to have a certain value as a representative value, various methods can be used, but most of them will assume the average value of each symbol. In the case of In-sync, an IS indication is generated if the Q_in threshold is exceeded for T_in = 100ms.

If the xSS is set as the target of the RLM, the symbol position (time and frequency) of the xSS may be known, or the network may be set to a broadcast channel or a dedicated signal. Based on this information, the reception strength of each symbol of xSS is measured. If it is known that the specific xSS symbol (s) among the network information is transmitted as one specific beam, the UE unconditionally does not compare the average value of the xSS symbols during T_out with the threshold value, but only the symbols transmitted in the beam unit If the value is larger than Q_in, it is regarded as a decision element of in-sync. If it is smaller than Q_out, it is considered as a decision element of out-of-sync.

FIG. 5 illustrates the difference in RLM operation that occurs while operating a beam in NR compared to the LTE mentioned above. it is checked whether the terminal can distinguish the beam carrying the xSS. If the terminal can not distinguish the beam, the terminal must give the base station information to identify the beam. XSSs transmitted in one xSS block or xSS block set may be defined as 'beam-specific xSSs'.

[Example 2-1 Example: Only SS is to be subjected to RLM]

More specifically, the received signal strength value of the xSSs transmitted by each beam is referred to as a 'received strength of the xSS per beam'. At this time, the 'reception intensity of beam-specific xSS' may be an average value of reception intensities of xSS transmitted in one beam, a linear combination having a specific weight value, or a terminal implementation. The condition for indicating the out-of-sync (OOS) by the UE is determined by considering the xSS transmitted during T_out by the UE, and whether or not the reception intensity of each x SS for each beam is larger or smaller than Q_out.

If all the 'receive intensity of beam-specific xSS' transmitted during T_out is less than Q_out, the terminal displays OOS in the upper layer. In another embodiment, the network may set an N value separately to indicate OOS when the N 'receive strengths of x SSs per beam' for x SS is greater than Q_out. This is because the number of beams carrying the xSS operating at each base station may be different, so that the OOS can be properly operated. Similarly, the base station can adaptively operate the T_out value with respect to the number of operating beams.

Likewise, in the case of IS, IS can be indicated using 'receive intensity of beam-specific xSS'. The condition for the terminal to indicate in-sync (IS) is whether the reception strength of each 'xSS for each beam' is larger or smaller than Q_in in consideration of all xSS transmitted during T_in. If one of the 'receive strengths of beam-specific xSS' transmitted during T_in is greater than Q_in, the terminal displays IS in the upper layer. In another embodiment, the network may set an N value separately to indicate OOS when the N 'receive strengths of x SSs per beam' for x SS is greater than Q_in. This is because the number of beams carrying the xSS operating in each base station may be different, so that the IS can be operated appropriately. Similarly, the base station can adaptively operate the T_in value with respect to the number of operating beams.

FIG. 6 illustrates a signaling for a base station to transmit a necessary factor when the above-mentioned xSS is used for radio link monitoring. As parameters, the SS setting information and the RLM / RLF parameters (the number of beams required to determine OOS and IS, the threshold information needed to determine OOS and IS, the time T_out required to generate one OOS indication, one IS indication The time required for generating T_in, the RLF timer value, and the number of consecutive indications required for the OOS / IS to start / stop the RLF timer, and at least one of the above factors). The base station may transmit this RLM / RLF factor as system information in broadcast signaling or UE dedicated signaling. Also, at least one of the RLM / RLF factors may use a default value if the UE has a default value in advance and is not further allocated by the BS. If additional allocation is made, update to the latest value and use.

The setting information of the xSS is the beam ID (or the corresponding time and frequency and resource information) carrying the SS to measure for the RLM, or the SS position information per time / frequency of the SS resource to be measured in the beam. T_out and T_in are time durations for measuring and generating one OOS / IS indication, and N is the number of beams when the result of one of the beam-by-beam measurements during one T_out or T_is is higher than the threshold That is, in the case of OOS, if N or more beams are higher than the threshold, it is not OOS, and in the case of IS, if N or more beams are higher than the threshold, IS is used). Also, the value of the RLF timer used at this time or the number of consecutive IS or OOS indications for operating the timer can be transmitted as a factor. If the xSS belongs to a band of one numerology, the necessary information can be transmitted at once without any additional setting in the connected state as shown in FIG. However, if the xSS spans a band with multiple numerologies based on one cell, and the terminal can access a limited number of bandwidth parts (BWP) at a time, each BWP may have a different numerology, The parameter values mentioned in FIG. 6 can be transmitted as a UE dedicated message to the active BWP allocated for use in the UE.

 As a detailed form related to the delivered threshold value, a threshold value (RSRP, RSRQ, SINR or RSSI value) of the measurement result of the RS corresponding to the given BLER is measured by measuring the xSSblock signal defined for the hypothetical PDCCH in the physical layer, Lt; / RTI > Alternatively, the target BLER of the hypothetical PDCCH can be delivered to the UE. The terminal receiving this value has mapping relation of xSSblock signal measure value corresponding to a given BLER, and generates OOS / IS by measuring xSSblock for a given BLER. For the above method, the base station may transmit an additional free threshold or BLER, and the base station may deliver a value selected from a set of a few predefined thresholds or BLER values.

In this case, OOS and IS can be generated independently according to each condition. There may be a minimum time gap for each indication due to UE signaling overhead or implementation problems.

[Example 2-2 Example: When CSI-RS becomes the object of RLM]

If the CSI-RS is used for radio link monitoring, the received signal strengths of the CSI-RSs included in the beam carrying the CSI-RS instead of the xSS are compared with threshold values to determine OOS or IS. In this case, the CSI-RS may be terminal-specific or cell-specific. In either case, the base station must forward the CSI-RS configuration information to the terminal. In a periodic case, or in an aperiodic event driven case, this CSI-RS setting can be performed. The UE should know whether the set CSI-RS belongs to a specific beam. Assuming that the UE knows the mapping of the beam and the CSI-RS, the UE considers the 'CSI-RS reception strength per beam' as in the case of the xSS defined above. 'Beam-specific CSI-RS reception strength' is a value obtained by the UE in a mean or linear combination of the reception strength of CSI-RSs transmitted in the corresponding beam.

The condition for the terminal to indicate out-of-sync (OOS) is determined by whether the reception strength of each CSI-RS for each beam is larger or smaller than Q_out in consideration of all CSI-RSs transmitted during T_out. If the 'reception intensity of CSI-RS for each beam' transmitted during T_out is less than Q_out, the terminal displays OOS in the upper layer. In another embodiment, the network may set an N value so as to display OOS when the N 'receive strengths of CSI-RSs per beam for CSI-RS' are larger than Q_out. This is because the number of beams carrying the CSI-RS operating in each base station may be different, so that the OOS can be properly operated. Similarly, the base station can adaptively operate the T_out value with respect to the number of operating beams.

Likewise, in the case of IS, IS can be indicated using 'receive intensity of beam-specific CSI-RS'. The condition for the terminal to indicate in-sync (IS) is determined by whether or not the reception strength of each CSI-RS for each beam is larger or smaller than Q_in in consideration of all CSI-RSs transmitted during T_in. If at least one of the 'reception strengths of CSI-RS per beam' transmitted during T_in is greater than Q_in, the terminal displays IS in the upper layer. In another embodiment, the network may set an N value separately to indicate OOS when the N 'receive strengths of CSI-RSs per beam for CSI-RS is larger than Q_in. This is because the number of beams carrying the CSI-RS operating in each base station may be different, so that the IS can be appropriately operated. Similarly, the base station can adaptively operate the T_in value with respect to the number of operating beams, as shown in FIG. Also, the RLF timer value used at this time or the number of consecutive IS or OOS indications for operating the timer can be transmitted as a factor.

In particular, whenever the UE specific CSI-RS is newly set, the base station can inform the RLM-related parameters together. In FIG. 7, when CSI-RS is set, setting information (CSIRS id set as corresponding setting information or time / frequency and resource position information of the corresponding beam) and RLM / RLF parameters (OOS and IS The RLF timer value, and the OOS / IS start / stop time of the RLF timer, the number of beams, the threshold value required for determining OOS and IS, the time T_out required for generating one OOS indication, the time T_in required for generating one IS indication, the number of consecutive indications required to stop the transmission, and at least one of the factors). The base station may transmit this RLM / RLF factor as system information in broadcast signaling or UE dedicated signaling. Also, at least one of the RLM / RLF factors may use a default value if the UE has previously set a default value and is not further allocated by the base station. If additional allocation is made, update to the latest value and use. If the terminal can access a limited number of bandwidth parts (BWPs) at a time, each BWP may have a different numerology, and accordingly different CSIRS settings may be given. The parameter values mentioned in FIG. 7 can be transmitted as a UE dedicated message to the active BWP allocated to use in the UE. In other words, in the case of FIG. 7, when the CSIRS setting is changed in the same BWP, it may be applied at the time of resetting, but when it is set to use another BWP, information shown in FIG. 7 may be carried in a message informing the corresponding BWP. Alternatively, after accessing the BWP after the new BWP is set to write, the information in FIG. 7 can be directed to a dedicated message.

As a detailed form related to the transmitted threshold value, the physical layer measures the CSIRS signal defined for the hypothetical PDCCH and transmits the threshold value (RSRP, RSRQ, SINR or RSSI value) of the measurement result of the RS corresponding to the given BLER to the base station Lt; / RTI > Alternatively, the target BLER of the hypothetical PDCCH can be delivered to the UE. The UE receiving this value has mapping relation of CSIRS signal measure value corresponding to a given BLER, and generates CS / IS by measuring CSIRS for a given BLER. For the above method, the base station may transmit an additional free threshold or BLER, and the base station may deliver a value selected from a set of a few predefined thresholds or BLER values.

If only aRS is used, aRS does not occur for a uniform period of time. Therefore, a DL TX is generated, the corresponding beam is received, and the aRS is measured to calculate a time average reception intensity value If the specified threshold value is not exceeded, it is determined to be OOS, and if it exceeds the specific IS threshold value, it is determined to be IS.

[Example 2-3: When SS and CSI-RS are used for RLM at the same time]

- Why the RLM / RLF parameters for each RS may be different

Since the SS must determine the OOS / IS by sweeping the beam in all directions over a wide beam, the T_out / T_in time window will be larger than for a narrow beam CSI-RS. Also, the CSI-RS beam is not all possible narrow beams, but rather is a small number of beams allocated to the data and control channels from the base station, so that T_out / T_in of the CSI-RS is often small depending on the number of beams . Thus, as an opportunity to check whether the current situation is in sync or out of sync, the time window of T_out / T-in will have the opportunity to be different for SS and CSI-RS for the same time. When the channel becomes bad, considering the SS or CSI-RS or the same waiting times, the RLF time value will also be large for SS and small for CSI-RS.

- If two RSs send the same indication to the RRC (ie, N is considered between the same RSs):

xSS and CSI-RS may be used for radio link monitoring at the same time. In this case, the setting information of each RS and the threshold value of the OOS / IS may be separately set for the xSS and the CSI-RS. The values of T_out and T_in and the value of N in OOS / IS may be set separately or may be integrated into one value. The timer value or the number of indications that should be displayed continuously can also be set separately. If all values are set separately, generation of OOS / IS can also occur independently of RS. In this case, when the RLF timer is activated in the RRC, the same indication is recognized regardless of the RS. That is, even if the OOS is informed again from the CSI-RS after the OSS is generated from the xSS, the RRC recognizes the two OOS as the same indication and recognizes it as a continuous OOS indication as in the LTE N310. Similarly, the IS recognizes the RRC as the same indication even if an IS occurs from a separate setting.

- If two RSs send one integrated indication to the RRC (that is, N is taken into account in the integrated RS view):

T_out and T_in values and N values in OOS / IS may be integrated settings, if they are not separate settings. In this case, considering all of the CSI-RS beam and the x SS beam intensity at the given T_out (where RS is both xSS and CSI-RS possible) If the intensity is greater than Q_out, OOS is generated. In this case, the OOS threshold value per x SS and CSI-RS can be set separately. Instead, it is N and T_out is the same regardless of RS.

Similarly, in the case of IS, the T_out and T_in values and the N value in OOS / IS may be integrated settings instead of the separate setting. In this case, considering all of the CSI-RS beam and the x-SS beam intensity of the RS of each beam during a given T_in (where RS is both xSS and CSI-RS possible) 'Is greater than Q_in, it generates IS. In this case, the IS threshold value per x SS and CSI-RS can be set separately. Instead, the N value and T_in are the same regardless of RS.

a. Averaging the measured values of both RSs before the OOS / IS decision

If both SS and aRS are used, the sample of SS is accumulated using the BRS OOS judgment method of the present patent, and the measured value of aRS is additionally accumulated in the calculated value of SS at the time when the aRS is transmitted and measured . At this time, the accumulate method takes the measured value of aRS in the cumulative value of the SS as a linear combination.

- When multiple RSs are configured simultaneously, giving priority

If two RSs are configured for RLM, then the network can signal which one of the RSs will take priority. Therefore, we can show the measure result of the RS corresponding to the priority at the signaling time and inform the RRC with OOS or IS. Alternatively, it is also possible to display the result of another RS according to the specific result of the specific RS, instead of giving priority to only the specific RS, to the RRC. The following is a hierarchical approach:

1) OOS of the SS should be prioritized.

Another way to use SS and aRS together is to make a hierarchical decision. If it is judged to be OOS based on the value obtained by measuring only SS, it is indicated as OOS in RRC without consideration of additional aRS. If the SS is the only IS, then the measure value of the aRS is determined again. If the measured value of the aRS is less than the given threshold value, the OOS is indicated on the RRC or the IS is indicated. In this case, the measured values of aRS take a linear combination among the aRS values, and the measure value of SS is obtained by accumulating the SS values by the first BRS OOS judgment method of the present patent.

2) SS of the SS shall be prioritized.

If it is judged to be IS based on the value obtained by measuring only the SS, it shall be indicated as IS in the RRC without consideration of the additional aRS. If SS alone is the OOS, the measure value of the aRS is determined again. If the measured value of aRS is less than the given threshold value, OOS is indicated on the RRC or IS is indicated. In this case, the measured values of aRS take a linear combination among the aRS values, and the measure value of SS is obtained by accumulating the SS values by the first BRS OOS judgment method of the present patent.

3) OOS of CSI-RS shall be prioritized.

If it is judged to be OOS based on a value obtained by measuring only CSI-RS, it is indicated as OOS in RRC without consideration of additional SS. If the CSI-RS alone is the IS, the measure value of the SS is determined again. If the measured value of the aRS is less than the given threshold value, the OOS is indicated on the RRC or the IS is indicated. In this case, the measured values of aRS take a linear combination among the aRS values, and the measure value of SS is obtained by accumulating the SS values by the first BRS OOS judgment method of the present patent.

4) IS of CSI-RS shall be prioritized.

If it is determined to be IS based on the value obtained by measuring only CSI-RS, it is indicated as IS in RRC without consideration of additional SS. If the CSI-RS alone is OOS, the measure value of the SS is determined again. If the measured value of the aRS is less than the predetermined threshold value, the OOS is indicated on the RRC or the IS is indicated. In this case, the measured values of aRS take a linear combination among the aRS values, and the measure value of SS is obtained by accumulating the SS values by the first BRS OOS judgment method of the present patent.

5) How to index

For the hierarchical method, an index for each combination may be created in advance, and the network may define a specific rule. The following [Table 1] may be an embodiment.

1 ^st check generates OOS when the corresponding result of the RS is generated, and 2 ^nd check if the result of 1 ^st check is not the result, and OOS when the result is obtained. Otherwise, the complementary result of OOS is generated. When the BS transmits the information, the cell wise RLM result is determined based on the RLM results of the two RSs based on the information, and the result is reported to the RRC.

6) When concurrently configured, if the delivered threshold is offset

When two RSs are used simultaneously, the threshold value corresponding to each RS may be an absolute value, but signaling is possible when one is an absolute value and the other is an offset.

When a BS transmits a parameter set corresponding to each RS to a UE, the threshold value may be an absolute threshold value or an offset value based on the threshold value may be transmitted when a threshold value of a specific RS is already given . For example, when aRS and SS are used simultaneously, since the beam width to which each signal is transmitted is different from the number of component beams, a measure value of aRS is added to the measured intensity value of the reception beam of SS, Offset value of the received signal strength may be needed. This offset value can be added to the measure value of the aRS to generate the SS received signal calculation value and the integrated metric. This integrated metric value can be compared with a given threshold value. For this purpose, the BS can transmit the offset value to the UE.

8, an offset value is set for each DL TX beam, the BS transmits the value to the system information, and whenever the DL signal is set, . The offset value is transmitted to the mobile station by the system information, and the base station transmits the SS in time or frequency sequence with always on. When the SS measures the SS and reports the best SS to the BS, the BS sets aRS for the DL TX beams constituting the SS and transmits the location information of the aRS to the MS. The UE measures through this information and transmits the result back to the BS. The BS finally selects the DL TX beam. In this case, knowing the number of the beams selected for the DL TX and the corresponding beam ID, the offset value to be applied can be known when the corresponding beam is measured. During this process, when calculating the aRS metric, when the DL TX beam is changed, the aRS metric calculation target should be changed from beam set 1 to beam set 2 based on this indication.

The following [Table 2] is an example of expressing related information.

If the last determined DL TX beam is determined to be 1 and 2 in 2, calculate the linear combination of the measured value of the SS with the measured value of the 1st and 2nd beams plus 5 dBm respectively. .

As another example of signaling, the information can be transmitted through an RRC dedicated message.

FIG. 9 shows an example of transmitting beam offset information through an RRC dedicated message. In this case, the BS can transmit the same information as when transmitting the offset value to the system information in the RRC dedicated message. Since the best SS has already been determined, the offset value is the offset value for the DL TX beams corresponding to the specific SS It can also be delivered. For example, if SS1 is selected and reported as the best SS, the BS can offset the DL TX beams corresponding to SS1 as shown in [Table 3].

FIG. 10 shows a process of transmitting relevant offset value information to a physical layer control channel. This embodiment has an advantage that it can be transmitted faster than the transmission in the other layer. For example, it is possible to notify the UE of the determined DL TX beam through the PDCCH and to transmit an offset value for each beam. In this case, it is not necessary to send the offset information to the DL TX included in another SS because the base station can select which DL TX beam to select and which one to select. Also, if the DL TX beam set is changed, it can also quickly deliver necessary offset information.

Alternatively, as shown in FIG. 11, the related offset information is transmitted to the MAC CE. When informing the DL TX beam, the offset value may be given to the number and ID of the determined DL TX beam in the MAC CE.

If only SS or CSI-RS is the object of RLM, RS can transmit the parameter set by RS, system information, or dedicated signaling. If the majority of terminals perform RLM through CSI-RS and SS, and the terminal capability does not have any problem in operating with two types of RS, information overhead can be reduced through system information.

However, if a particular terminal can only report on one of the RSs, or if a specific bandwidth part can only be configured with CSI-RS without an SS, the terminal operating in that bandwidth part can receive information corresponding to CSI- You may only need it. In addition, the CSI-RS configuration information allocated to the used bandwidth part and the threshold information required for the RLM may be different according to other numerology. The bandwidth part used by the UE may change with time. In this case, the base station transmits the setting information for the CSI-RS, as well as the OOS Information of the N value of / IS, a threshold value (absolute or offset), T_out, T_in, RLF timer value, and the number of consecutive indications.

7) How to apply RLF parameters when RS is configured concurrently

A continuous OOS or IS indication transmitted from the PHY must be sent to the RRC to start or stop the RLF timer. If only one RS is configured or two RSs are configured, if only one RS is continuously prioritized without change, the RLM and RLF operations can be performed by continuously inheriting the RLF parameters of the corresponding RS. However, when a plurality of RSs are configured, if the priority of the RS for RLM is changed from the previous RLM to the new RS, ignore whether to apply the existing RLF parameters and reset the existing parameter status, You must decide whether to apply the RLF parameter of RS.

To do this, the RRC must know which RS the indication originated from. A way to know this is to send an indication for each RS in the phy. That is, OOS and IS for SS are transmitted to RRC, and when CSI-RS is set, OOS and IS for CSI-RS are transmitted to RRC. Another way is that there is no distinction between OOS and IS, but from the viewpoint of RRC, the PHY indication is recognized from the RS when the prioritized RS is set according to the given prioritization rule.

As shown in FIG. 12, the physical layer can provide an indication for each RS to an upper layer (RRC), and a method of providing an integrated indication is also available. When an indication is given for each RS, phy performs RLM for all RSs regardless of the priority RS, and delivers each indication to an upper layer. RRC reports the indication and applies RLF parameter of priority RS do. If the physical layer assigns the aggregation indication to the upper layer, the physical layer does not perform the RLM for the RS other than the priority RS. The RRC distinguishes the indication coming up according to the set time of the priority RS and applies the related RLF parameter.

If the RRC distinguishes the indication in the above method, the corresponding RLF parameter application method is as follows.

- Conditions for applying different RLF parameters

If the terminal CSI-RS is an IS, there may be a case where the associated SS is not always IS. In the case of FIG. 13, the majority of the wide beam carrying the SS is blocked in the building, but one narrow beam of the beam may not be blocked in the building. In this case, the received power strength of the SS may be quite low, but the CSI-RS beam 1 may not be a problem at all. Therefore, it is a reason why an independent channel state should be grasped for the RS. This case will be solved by introducing RS parameter reset.

However, on the other hand, since the remaining CSI-RS beams share the same channel state (OOS) as the SS, and since T_IS, which also determines SS IS, is longer than CSI-RS T_IS, If all of them are satisfied, it is also meaningful to judge by in-sync. If the network determines that the three-period correlation of the received signal between the SS beam and the CSI-RS beam is high based on the existing beam measurement value, it instructs the terminal to inherit the existing parameters, It is possible to instruct the terminal in the method of resetting the parameter.

- Number of consecutive indication

There are a number of consecutive indications of the RLF parameters transmitted per RS. It can be assumed that the RLM is performed through the SS and the CSI-RS is set to the RLM-prioritized policy at the moment when the CSI-RS is configured at a certain point in time. As shown in the left drawing of FIG. 14, it can be assumed that the UE is allocated 3 as the number of consecutive OOS Indications for starting the RLF timer of the SS and 2 as the OOS number for the CSI-RS. When CSI-RS is configured, two OOSs are generated consecutively until the CSI-RS is configured. If there is only one OOS of CSI-RS after that, if the CSI-RS is configured, RRC is 3 And starts the timer. If it is reset rather than inheritance, the RRC must activate the timer by newly receiving two OOS from the CSI-RS.

As shown in the right diagram of FIG. 14, after the CSI-RS is configured, when the CSI-RS is released while the CSI-RS generates the IS while the RLF timer is operating, the SS performs the RLM again. In this case, in order to stop the timer, the number of OOSs of the CSI-RS is inherited, and when the SS generates the IS, the timer is stopped or reset by the cumulative number of consecutive numbers regardless of the RS, Count the number of ISs and stop the timer.

- timer value

Among the RLF parameters transmitted per RS, there are timer values. It can be assumed that the RLM is performed through the SS and the CSI-RS is set to the RLM-prioritized policy at the moment when the CSI-RS is configured at a certain point in time. As shown in the left drawing of FIG. 15, the terminal starts the RLF timer due to the OOS of the SS. Assuming that the CSI-RS has been established since then, if the parameter is inherited, the RLF timer value for the SS continues to be applied and the timer continues until the CSI-RS transmits the IS number or expires the timer.

In another embodiment, when the CSI-RS is set, only the timer value is changed for the CSI-RS and the elapsed timer value can be inherited as it is. However, if the parameter is reset, the old timer is reset at the time when the CSI-RS is set, and if the CSI-RS is measured by the IS, the timer does not operate and if a predetermined number of consecutive OOS occurs, the timer is started.

RS, the RLF timer for the CSI-RS is operated after the CSI-RS is configured. If the CSI-RS is released or unconfigured during the generation of the IS by the CSI-RS, the CSI- The RLF timer for SS can be newly applied or the value of the existing CSI-RS timer can be inherited and the SS can proceed to timer expiry until a predetermined number of consecutive ISs are generated. Alternatively, the elapsed timer value can be inherited to the present time, and the actual expired timer value can be changed for the SS. If you use the timer value for SS, if the elapsed time has already exceeded the timer value for SS, stop the timer immediately and declare the RLF. Otherwise, expire the timer value for SS.

- How to apply RLF parameters Signaling

For each of the two parameters, a static rule may be used, or the network may be dynamically set to inform the terminal. In this case, for each of the two parameters, an indication of the operation to reset / inherit can be displayed and transmitted in the same message as the RRC connection reconfiguration.

16 is a diagram illustrating an operation of a base station using a specific bandwidth part according to capability and service requirement of the terminal. If the terminal has one RS set in the currently active active BW part, it operates according to the RLM / RLF parameters and rules for that RS. If the RS set in the active BW part is more than one type, the UE determines the priority type of the RS in the specific BW part according to the predetermined priority or the priority between the RS types set by the base station, and the RLM / RLF parameter and the rule Lt; / RTI >

The base station permits the use of a specific bandwidth part, and transmits the SS setting information and the parameter value to the dedicated signaling according to whether the SS exists in the corresponding bandwidth part or only the CSI-RS exists. If CSI-RS needs to be set, it transmits CSI-RS configuration information and parameter values. If both of the RSs are to be set, that is, if the SS is transmitted to the corresponding bandwidth part and CSI-RS via a narrow band beam is required for data transmission / reception of the UE, RLM And displays the priority rule. Also, it is possible to set whether to inherit or reset the existing parameter when the RLF parameter changes.

As shown in FIG. 16, the SS-related configuration information and the RLM / RLF parameter set may be transmitted in a broadcast channel or a shared channel to which system information is transmitted as option 1, and the first SS-related RLM / RLF parameter It is given to the terminal and may be given as dedicated signaling to the RRCconnectionReconfiguration message after establishing the RRC connection.

When the UE informs the base station of its capability information (whether it is capable of beamforming TX / RX, available bandwidth and frequency) and service information (whether it is a delay sensitive service or not) , URLLC, mMTC, and so on. At the same time, it reports whether the SS is present in the corresponding bandwidth part and, if it exists, informs the setting information of the SS and RLM / RLF parameters again.

After that, it can receive the CSI-RS setting by measuring the SS in the corresponding bandwidth part and feedback the result, and if the SS does not exist in the corresponding bandwidth part, it transmits the SS to the cell or bandwidth part of the first RRCConnection, . Or without SS measure feedback. This CSI-RS will be used in the allocated bandwidth part.

 When the CSI-RS is established, it informs the corresponding configuration information and parameters, and at the same time indexes the RS prioritization rule. In addition, if it is determined that the correlation between the CSI-RS beam and the SS beam received signal strength is strong through the service characteristics received from the terminal and the beam feedback received from other terminals, an inherit indication is transmitted to the terminal when the RLF parameter is applied. Otherwise, a reset indication is given to the terminal.

After receiving the request, the terminal goes to the indicated bandwidth part, performs communication, and performs RLM according to a given prioritization rule.

If there is no SS in the bandwidth part, RLM / RLF can be performed using only CSI-RS configuration information and parameter information. Alternatively, measurement gap information for measuring the SS, the bandwidth part information (frequency, cell ID, or bandwidth part id and the like), SS of the corresponding bandwidth part, RLF parameter information and prioritization there may be a method in which the SS and CSI-RS are both measured while the terminal is presenting the presence / absence information of the reset, and the prioritization and reset are performed according to the command. If the bandwidth part in which the SS exists and the bandwidth part in which only the CSI-RS exists are not quasi co-located or co-located sites but TX is physically separated, the signal strength correlation between the SS and the CSI-RS may deteriorate. In this case, the base station can set a reset when the RLF parameter is applied.

In another embodiment, as shown in FIG. 17, the UE does not transmit the RB configuration information, the requested service feature related information, the preferred bandwidth part information, and the like through the RRCConnectionSetup message. Lt; / RTI > In this case, when the relevant information is transmitted before the CSI-RS setting, the prioritization rule and RLF parameter inherit or reset indication are transmitted based on this information.

If the UE beam forming related capability info, requested service characteristic related information, and preferred bandwidth part information are transmitted after the CSI-RS setting, the base station sets up the prioritization rule and the RLF parameter inherit or reset indication to a predetermined default value .

As another example, if the BS does not deliver the prioritization rule and the RLF parameter inherit or reset indication but the BS has a predetermined default value so that the BS does not transmit another value, Can be applied.

In another embodiment, when an RLF is declared or an RLF is declared while performing an RLM operation for each active BWP, the terminal switches itself to a predefined BWP, attempts to access the corresponding BWP, If the connection is successful, RLF is not declared, and if the connection fails, RLF declaration can be performed and a new cell can be found. This default BWP can be the default BWP, or it can be any other configured BWP. A method of accessing a predefined BWP may be a method through a RACH, or a dedicated preamble such as a reconnection indication or a scheduling request through the PUCCH.

In particular, when terminals are switched for each BWP, the following embodiments may be added with respect to the RLM / RLF operation.

(1) The network may set a radio link monitoring reference signal (RLM-RS) to the UE. The RLM-RS may be a synchronization signal (SS), a cell specific reference signal (CRS), a sounding reference signal (SRS), a channel state information reference signal (CSIRS), or a combination thereof. The RLM-RS set to the UE can notify the time, frequency resource location, and code information of the RS if the code is used. Or if the specific pattern is agreed on in the network with the terminal. The MS receiving the setup reads the time and frequency resources of the RLM-RS, applies the RLM parameter associated with the RS, and transmits the IS (in-sync) or OOS (out-of-sync) indication to the upper layer .

As the RLM parameter, a threshold value (RSRP, RSRQ, RSSI, or a BLER value considering a hypothesis PDCCH) for generating an IS if a reception power is higher than a specific threshold value is considered And a number of RSs or beams that should be higher than the threshold value, a threshold value for generating OOS when the reception power is lower than a specific threshold value, and information on the number of RSs or beams lower than the threshold value, And the time window value required to measure IS and OOS, and an interval for generating IS and OOS. This information can be known through dedicated signaling when each RS, such as SS or CSI-RS, is set, or can be known as broadcast signaling with system information in the first place.

(2) When the network establishes the RLM-RS to the UE, the corresponding RS may or may not exist among the entire set bandwidth parts (BWPs). In particular, when the MS uses a scheduled BWP (active BWP), if the RLM-RS does not exist in the BWP, the MS temporally moves to the BWP including the frequency location where the RLM-RS exists and receives the RLM- And a periodic indication can be generated.

[fallback or gap setting to RLM-RS BWP by active BWP] In the above case, in the originally scheduled active BWP, the movement to BWP with RLM-RS is called fallback. Information such as a fallback time, a stay time in a fallback BWP, a time to move back to the originally scheduled active BWP, and a repetition period of a pattern of this fallback may be given to the mobile station from the network. Or RLM-RS based on the time information of the RLM-RS, if the network schedules the terminal with any other established BWP that does not include the RLM-RS, the UE does not need to monitor the scheduled active BWP And the network can transmit to the terminal. This measurement gap can be given information such as the start point of the gap, the duration of the gap, and the measurement gap repetition period.

The terminal that has set the measurement gap for RLM monitors the currently active active BWP, moves to the BWP where the RLM-RS is set at the time when the gap starts, receives the RLM-RS for the predetermined gap duration, Return to BWP and perform communication.

18 is a diagram illustrating a case where an RLM-RS according to an embodiment of the present invention exists in only one frequency region.

If only one of the RLM-RSs is present in FIG. 18, the RLM-RS can be set by the base station to the UE regardless of the active BWP currently being monitored by the UE (i.e. absolute RLM-RS information). The BS schedules the active BWP to the MS and determines whether the active BWP is the BWP having the RLM-RS, and if so, does not transmit the fallback information or the RLM-RS measurement gap information of the separate RLM-RS BWP have.

In this case, the terminal performs RLM without moving to another BWP. If there is no RLM-RS in the active BWP scheduled by the base station, the base station simultaneously transmits fallback information or RLM measurement gap information of the RLM-RS BWP to the mobile station. The terminal can fall back to the RLM-RS BWP during the monitoring of the active BWP through the transmitted information or receive and measure the RLM-RS through the gap information and return to the original active BWP. FIG. 19 is a diagram for explaining RLM-RS signaling when the active BWP has the RLM-RS as described above and the RLM-RS signaling when the active BWP has the RLM-RS.

20 is a diagram illustrating a case where an RLM-RS according to an embodiment of the present invention exists in a plurality of frequency bands.

As shown in FIG. 20, if there are a plurality of RLM-RSs, a different kind of RLM-RS may be used in correlation with an active BWP, and thus a different kind of RLM BWP may be used.

For example, an RLM-RS close to the active BWP in the frequency domain can be selected and used. Accordingly, in the case of option 2 in FIG. 19, an RLM-RS based on active BWP can be newly set instead of the initially set RLM-RS. Also, a BWP for RLM fallback based on a newly set RLM-RS can be set. This information can be selected and informed to the mobile station when the base station sets active BWP.

For example, if the active BWP is BWP3, the RLM-RS at that time would be the RLM-RS present in BWP4, and the RLM fallback BWP could be BWP4. If the active BWP is 1, the fallback BWP can be newly set to the RLM-RS existing in the BWP0 and the BWP0 and the RLM-RS. In FIG. 19, RLM-RS configuration and RLM fallback are indicated as BWP based on scheduled BWP. The RLM-RS, which is the second signaling in FIG. 19, may mean all information of the RLM-RS existing in the corresponding cell. When the active BWP is used, the RLM- RS is limited and informed. The latter updates the information of the former.

(3) In addition to the case where the RLM-RS mentioned in item (2) does not exist in all BWPs, in some cases, there may be RLM-RSs in all BWPs. In this case, instead of measuring the RLM-RS by moving to a specific BWP, the RLM-RS present in each scheduled active BWP is measured and the corresponding RLM parameter is applied to generate an OOS / IS indication.

Since all RLM-RS information is given in the first figure of FIG. 19, and the base station knows that this RLM-RS exists in all BWPs, the base station does not give RLM-RS information specific to the active BWP. The UE compares the location information of the RLM-RS and the frequency information of the active BWP, recognizes that the RLM-RS exists in the corresponding active BWP, and performs RLM operation within the active BWP without performing fallback or measurement gap- .

(4) If there is a BWP or RLM measurement gap setting for the RLM fallback, the UE generates an indication by measuring the RLM-RS at the corresponding point in time, and operates the RLF timer by applying the layer 3 parameter based thereon. However, when an active BWP is scheduled (or switched) when there is an indication of RLM-RS present for each active BWP as in item (3), there is a variation of whether to apply or reset the L3 parameter do.

If the BWP channel correlation is not large, it can be reset, and if the correlation is large, it can be succeeded. Considering the case of the number of consecutive IS or OOS indications used to start or stop the RLF timer among the L3 parameters, the RLF parameter state received from the previous BWP (the number of consecutive IS indications displayed from the previous active BWP and the previous active The number of consecutive OOS indications displayed in the BWP), the UE shall inherit from the switched active BWP.

If the RLF timer has been started in the previous active BWP, it will stop the timer when it receives a predetermined number of consecutive ISs (considers succession) from the switched active BWP, Once the OOS has been acknowledged (considered to be inherited), the timer continues to operate. If the channel correlation per BWP is not large, it can be reset.

In this case, if the number of consecutive IS indications generated up to the previous active BWP and the number of consecutive OOS indications generated until the active BWP are switched to 0 If the RLF timer is started in the previous BWP, the corresponding timer value is also reset to the original setting value and stopped. When an RLM indication is received from a switched (or scheduled) active BWP, the RLF timer is activated if the predefined IS / OOS consecutive indication number parameter is satisfied.

(5) RLM-RS Since the various RSs mentioned in 1) above can be used, different RLF parameters can be set for different BWPs. When the active BWP is newly scheduled to the terminal, the base station may transmit at least a part of the following values as the RLF parameter. (RSRP, RSRQ, RSSI, SINR or hypothetical PDCCH BLER value) required for the IS generation, a threshold value (RSRP, RSRQ, RSSI, SINR or hypothetical PDCCH BLER value) The interval to transmit the IS / OOS indication to the upper layer, the number of beams or RSs to be considered when making the indication (how many of the total number of RSs exceeds the threshold of IS, The number of consecutive OOSs to start the RLF timer, the number of consecutive OOSs to start the RLF timer, and the number of consecutive OOSs to start the RLF timer. The number of consecutive ISs, etc.)

21 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

Referring to FIG. 21, the base station may include a transmission / reception unit 2110, a control unit 2120, and a storage unit 2130.

In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transceiver 2110 can transmit and receive signals with other network entities. The transmission / reception unit 2110 can transmit system information to the terminal, for example, and can transmit a synchronization signal or a reference signal.

The controller 2120 can control the overall operation of the terminal according to the embodiment of the present invention. For example, the controller 2120 may control the signal flow between each block to perform an operation according to the flowcharts described above.

Specifically, the controller 2120 can control the operation proposed by the present invention to transmit a radio link problem to an upper layer according to an embodiment of the present invention.

The storage unit 2130 may store at least one of information transmitted and received through the transceiver 2110 and information generated through the controller 2120.

For example, the storage unit 2130 may store information related to an event defined to deliver a radio link problem.

22 is a diagram illustrating a structure of a UE according to an embodiment of the present invention.

22, the terminal may include a transmission / reception unit 2210, a control unit 2220, and a storage unit 2230.

In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transceiver 2210 can transmit and receive signals with other network entities. The transmission / reception unit 2210 can receive system information from, for example, a base station and can receive a synchronization signal or a reference signal.

The controller 2220 can control the overall operation of the terminal according to the embodiment of the present invention. For example, the control unit 2220 may control the signal flow between each block to perform the operation according to the flowcharts described above.

Specifically, the control unit 2220 can control the operation of measuring the SS, the BRS, and the like with respect to the radio link according to the embodiment of the present invention.

The storage unit 2230 may store at least one of information transmitted and received through the transceiver 2210 and information generated through the controller 2220.

For example, the storage unit 2230 may store information for radio link monitoring according to an embodiment of the present invention.

RLM / RLF parameters may be set differently depending on the service type, irrespective of the type of the RS for the RLM if the RLM / RLF parameters can be set differently according to the type of the RS. 23 shows an operation in the case where the RLM / RLF parameter is set differently according to the type of service received by the terminal. When the base station recognizes a desired service, the RLM-RS is set and the RLM and RLF parameters associated with the RLM-RS are set. Upon receiving the setup information, the UE performs RLM using this value, and performs timer operation according to the IS / OOS using the RLF parameter to declare the RLF. In this case, the RLM factors transmitted by the base station include RLM-RS setting (type of RS, time and frequency position of RS, threshold value information for comparing with the measurement value of each RS, etc.) and RLF parameter (RLF timer value, indication number, the number of consecutive OOS indications, etc.). The MS receiving this value determines the position of the RS and transmits a periodic indication of IS or OOS to the RRC through a given RLM parameter. When the RRC layer receives this indication, it can stop or start the RLF timer if the set IS or OOS indication is satisfied.

There are various ways that the base station knows the service type of the terminal. If the bearer of the terminal is set, if the 5 tuple of the IP packet of the E-RAB or the flow is seen, the IP address and the port of the corresponding server can be known, or the type of traffic can be recognized through the QoS flow information . The base station learns the service type for each bearer through the recognized traffic type. If a terminal has multiple bearers that perform different types of services, the base station can set RLM / RLF based on services that have more restrictive service constraints. For example, if VoIP and generic eMBB data services coexist in a terminal, RLM / RLF configuration can be set based on VoIP, which is more susceptible to failure due to the nature of voice traffic.

The following embodiment can be considered as a structure that can be entered into the ASN.1 of the RRC. Since the Pcell or Pscell performs the RLM / RLF operation, the following IE can be carried in the container for setting the Pcell / Pscell among the RRC messages. Alternatively, it can be placed in the measConfig IE containing the configuration of the RS for mobility.

PCellConfig or measConfig>

RLM-config

- List of RLM-RS

■ List of RLM-resource-config-SS ex. {SSB1, SSB2, SSB5}

■ List of RLM-resource-config-CSIRS ex. {1-2 (for 2 level) or 1-1-3 (for 3 level) etc.}

- Threshold info

■ Pair_of_BLER_ID                ex. {0 or 1}

The list of RLM-resource-config-SS may include a list or time of SSB index used in the RLM-RS, frequency position information, and repeated pattern information. In the list of RLM-resource-config-CSIRS, the pointer of the CSIRS resource belonging to some or all of the CSI-RSs currently set in the Pcell or Pscell is entered as a list, or the resource time, Frequency position information, and repeated pattern information can be included in the list. Pair_of_BLER_ID indicates the pair of the target hypothetical PDCCH BLER value of the received signal for each used RS when determining IS and OOS by ID as to which one of the predefined pair values is to be used. This indication may indicate the BLER indication to be used as well as the service mapped to that BLER. For example, if it is 0, it uses the BLER pair value used in LTE and can mean general service. 1, it means the case of eMBB service or VoIP service, and the predefined BLER value can be indicated to use. The service-specific threshold value or BLER value information can be given by the BS through dedicated signaling. Or may be defined on a service-by-service basis rather than on a per-terminal basis. When defined on a per-terminal basis, an RRC message or MAC CE may be used for this indication. In another embodiment, when the BLER value is not set, a default BLER value to be always applied may be defined. For example, if the default is LTE BLER, the terminal receives the RS configuration through the RLM-config in the connected state, but if the Pair_of_BLER_ID is not set, it uses the LTE BLER value by default and can override it if the Pair_of_BLER_ID is given later have. In this case, the service type also defaults to the service type corresponding to the default BLER.

The RLF parameter signaling is related to the number of consecutive IS / OOS values and timer value for the timer operation according to the service type identified in the system, the RS measurement time window (or occurrence interval) for OOS, and the RS measurement time window for IS Or occurrence interval) may also be given to the terminal. This parameter can be passed to the RLF-TimersandConstants signaling of the CellGroup configuration container among the RRC messages, and the parameters can be set and transmitted for each service. The terminal can select and use the RLF parameter corresponding to the service type mapped to the BLER value selected according to the value displayed in the Pair_of_BLER_ID of the RLM-config among the values predefined and transmitted for each service.

For example, the RLF parameter corresponding to normal service and VoIP is transmitted in advance as follows.

The base station can transmit the RLM setting when the UE moves from idle to connected or when it makes the first RRC connection. In case of handover to another cell as shown in FIG. 24, the target cell receives the service information of the corresponding UE from the serving cell, and transmits the RLM RS setting and BLER setting information and the RLF parameter to the serving cell based on the received service information. The serving cell can send this to the RRC message. If the serving cell learns that the service type of the UE has changed as described in the above paragraph while the UE is connected, the serving cell sends new BLER information through the RRC reconfiguration message or newly sets the BLER information together with the BLER information And transmits RLM-RS information.

Upon receiving the setting information, the MS confirms the RLM RS setting information and measures a sample value of a predetermined number of received signal strengths (RSRQ, RSRP, SINR, etc.) After generating one representative value, if the corresponding representative values for all RLM RSs exceed the predetermined number of RSs or exceed the predetermined number of RSs, an IS indication is given to the RRC, otherwise an OOS indication is given to the RRC. The RRC stops / starts the RLF timer determined in the RLF parameter when the number of consecutive IS / OOS values determined in the RLF parameter is satisfied in consideration of the IS / OOS indication received from the physical layer.

In another embodiment, the BS may instruct the MS to monitor only the RLM-RS included in the corresponding subset by transmitting an indication message including a part of the RS set as a subset. In this case, the indication message may be an RRC message, a MAC-CE message, or a DCI message. It goes without saying that the message may include an absolute or relative indicator of the RS.

It should be noted that the indication message may instruct the RLM-RS included in the per-message to perform a Radio Link Monitoring operation. In this case, the UE may measure and monitor other RLM-RSs as well as the corresponding RLM-RS, but may generate a Radio Link Monitoring operation, for example, an out-of-sync indication or an in- It should be understood that the operation may be performed using only the RLM-RS included in the indication message.

In another embodiment, the BS does not monitor all of the RSs set as the RLM-RS set in the terminal, but when the specific BWP is set in the terminal, the RLM- RS, or specific RSs dedicated to the BWP. In this case, the indication message may be an RRC message, a MAC-CE message, or a DCI message. It goes without saying that the message may include an absolute or relative indicator of the RS.

It should be noted that the indication message may instruct the RLM-RS included in the per-message to perform a Radio Link Monitoring operation. In this case, the UE may measure and monitor other RLM-RSs as well as the corresponding RLM-RS, but may generate a Radio Link Monitoring operation, for example, an out-of-sync indication or an in- It should be understood that the operation may be performed using only the RLM-RS included in the indication message.

Also, when the UE changes its BWP, the RLM-RS may detect an RLM-RS corresponding to each BWP and monitor the corresponding RLM-RS or transmit an out-of-sync indication or an in-sync- Indication may be generated and forwarded to an upper layer.

In another embodiment, it is a matter of course that the BS may transmit the RLM operation of the UE by including any number in the indication message. In this case, the indication message may be an RRC message, a MAC-CE message, or a DCI message. The UE measures RLM-RSs that can be measured by the UE when the UE has received the indication message, lists the measured values and RS IDs of the RSs in order of performance, For example, an out-of-sync indication or an in-sync-indication may be generated and transmitted to an upper layer.

In the above embodiment, when signaling the RLF timer and the constants value according to the threshold value corresponding to the specific service, the base station sets timers and constants for each service threshold value in advance and transmits them to the UE in the ue-TimersAndConstants IE Or if the base station detects a change in the service type while transmitting it in the rlf-TimersAndConstants IE, and transmits only the indication of the BLER threshold pair for IS / OOS judgment by changing the value to another value, the base station transmits the RLF timer and constants Value may not be delivered with the threshold pair indication signaling. In this case, it is not necessary to transmit all the changed values of the other factors of the RLF according to the change of the service type, so that the signaling overhead can be reduced. In this case, all of the timers affected by the service change can set timers and constants for the thresholds as described above. For example, it is applicable to T301, T310, T313, T311 and N310, N311, N313, N314.

In the above embodiments, when a specific BWP is set in the UE, it is not necessary to monitor all the RSs set in the RLM-RS. Instead, the RS corresponding to the frequency range of the corresponding BWP in the RS set of the RLM-RS, As an example, detailed signaling will be described as an example of transmitting an instruction message to allow the UE to monitor only specific RSs. When the BS sets and directs the RLM-RS to the UE, it can indicate the factor that each RS is associated with a specific bandwidth part. When the BWP factor for each RS is indicated, the UE can use only the RLM-RS corresponding to the currently set BWP for the RLM operation. The ASN.1 level signaling for this is as follows. The RLM-RS list set by the base station is a set of RLM-RSs, and each RLM-RS can indicate the RS type, thereby indicating SSB or CSI-RS.

In addition, each RLM-RS may include a BWP index to be activated. If SSB is used as RLM, RS can be specified as an index of the SSB operated by the corresponding serving cell. If the CSI-RS is used as an RLM, a part of the set CSI-RSs for beam management of the corresponding Spcell can be used as a CSI-RS for RLM, and a predefined CSI-RS resource ID May be used to indicate a CSI-RS for RLM. When referring to CSI-RS, the location information and the repeated information in the frequency and time axes of the corresponding CSI-RS can be transmitted together. In addition, a threshold value which is a criterion for determining strength / weakness of the reception strength of RSs for expressing IS or OOS may be transmitted from the BS. In this case, the threshold value pair index connected with the predefined threshold value Lt; / RTI > The UE then selects one of the thresholds defined in the standard and applies it to the RLM.

These parameters can be passed to the RRC message and to the MAC CE or DCI. Table 4 below shows the cases included in the RRC message, especially in the SpCell configuration.

SpCellConfig :: = SEQUENCE {
- Parameters for the synchronous reconfiguration to the target SpCell:
reconfigurationWithSync   SEQUENCE {
    spCellConfigCommon     ServingCellConfigCommon,
    newUE-Identity  RNTI-Value,
    t304  ENUMERATED {ms50, ms100, ms150, ms200, ms500, ms1000, ms2000, ms10000-v1310}
    rach-ConfigDedicated  RACH-ConfigDedicated OPTIONAL - Need M
}            OPTIONAL, - Cond SpCellChange
   rlm - config RLM - RSConfig OPTIONAL , - Need M

     spCellConfigDedicated     ServingCellConfigDedicated       OPTIONAL - Need M
}

SCellToReleaseList :: = SEQUENCE (SIZE (1..maxNrofSCells)) OF SCellIndex
SCellToAddModList :: = SEQUENCE (SIZE (1..maxNrofSCells)) OF SCellConfig

SCellConfig :: = SEQUENCE {
     sCellIndex    SCellIndex,
     sCellConfigCommon    ServingCellConfigCommon   OPTIONAL, - Cond SCellAdd
     sCellConfigDedicated  ServingCellConfigDedicated OPTIONAL - Cond SCellAddMod
}
RLM - RSConfig :: = SEQUENCE {
rlmInSyncOutOfSyncThrehold INTEGER ( 0..1) OPTIONAL, - Need M
rlmRSList SEQUENCE (SIZE ( 1..8 )) OF RLM - RS
}
RLM - RS :: = CHOICE {
RLM -SSB INTEGER ( 0.63 )
RLM - CSIRS INTEGER ( 0. NZP -CSI- RS - ResourceMax - One)

}

The RLM-RS is an IE that sets the characteristics of the individual RLM-RSs included in the rlmRSList. Each RLM-RS may be an SSB or a CSI-RS, and in the case of SSB, it may be designated using an SSB index used in the corresponding cell. The CSI-RS can be specified using the CSI-RS resource index set for beam management or RRM in the corresponding cell. In this case, each SSB or CSI-RS may further include information on which RSs are assigned to which BWPs. For example, the base station can indicate the bandwidth part ID in which the SSB or CSI-RS is used together with the RS index in this signaling IE. Also, in case of CSI-RS, time related information of the corresponding RS can be further included. For example, periodicity information, a slot offset value at which a repetition pattern based on a reference subframe starts, may be added.

The network can set a maximum and minimum number of RLM-RS for each set BWP, and the UE can monitor only the RLM-RS currently set in the active BWP. In this case, the maximum and minimum numbers may be defined in the specification, the capability signaling of the terminal, and the number of RSs that can be simultaneously monitored may be determined by the base station. In order to perform the RLM operation of the current active BWP, the minimum number of values may be one or more.

Claims (1)

A method for processing a control signal in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting the second control signal generated based on the process to the base station.

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