KR20180080972A - Method, Apparatus, and System for UE Identification and Paging signal transmission for a UE in a Power Saving State - Google Patents

Abstract

The present disclosure relates to a communication method and system for fusing a 5G communication system for supporting a higher data transmission rate than a 4G system with an IoT technology. The present disclosure can be applied to intelligent services (e.g. smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security- and safety-related services, etc.) based on a 5G communication technology and an IoT-related technology. In particular, the present invention relates to a method for performing an operating procedure of a power saving mode of a terminal for a system including one or more base stations and one or more terminals, and distinguishing a terminal of a base station for transmitting paging to the terminal.

Description

TECHNICAL FIELD The present invention relates to a method for distinguishing a terminal in a power saving mode and a method, an apparatus, and a system for paging signal transmission that wakes up a terminal operating in a power saving mode Power Saving State}

The present invention relates to a next generation wireless communication system and more particularly to a power saving mode operation procedure of a terminal for a system including one or more base stations and one or more terminals and a terminal of a base station for transmitting paging to the terminal Method, a method of recognizing a terminal, and a method, a procedure, and a system in which a plurality of base stations transmit paging information to an individual terminal in an area.

The present invention also relates to a system, method and apparatus for performing beam tracking and beam feedback operations in a beamforming based system. The present invention also relates to beam feedback and beam management in a wireless system in which a base station and a terminal using multiple antennas are present. The present invention relates to a beamforming method and a beamforming method, and more particularly to a beamforming method and a beamforming method in a beamforming system using a beamforming method, A beam-feedback operation including an indicator for informing a beam-using subject (base station) and a continuous beam-beam tracking method using the beam-feedback operation are designed.

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 (CoMP) Have been developed. In addition, in the 5G system, advanced coding modulation (ACM), hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), advanced connection technology such as FBMC (filter bank multi carrier) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet has evolved into an Internet of things (IoT) network in which information is exchanged among distributed components such as objects in a human-centered connection network in which humans generate and consume information. IoE (internet of everything) technology combining IoT technology such as big data processing technology through connection with cloud server is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required. In recent years, sensor network for connecting objects, machine to machine , M2M), and machine type communication (MTC). In the IoT environment, an intelligent IT (internet technology) service can be provided that collects and analyzes data generated from connected objects and creates 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 sensor network, machine to machine (M2M), and 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.

The 5G system considers support for various services compared to the existing 4G system. For example, the most representative services are mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), massive machine type communication, and evolved multimedia broadcast / multicast service (eMBMS). The system providing the URLLC service may be referred to as URLLC system, the system providing eMBB service as eMBB system, and the system providing mMTC service as mMTC system. In addition, the terms service and system can be used interchangeably.

The present invention relates to a power saving mode operation procedure of a terminal for a system including one or more base stations and one or more terminals, a method for distinguishing a terminal of a base station for transmitting paging to the terminal, Procedures and systems for transmitting paging information to a plurality of base stations in an area.

SUMMARY OF THE INVENTION The present invention provides a system, method, and apparatus for performing beam tracking and beam feedback operations in a beamforming based system. In addition, the present invention provides a beam feedback and beam management method in a wireless system in which a base station and a terminal using multiple antennas are present.

It is another object of the present invention to provide a method and apparatus for measuring a reference signal for selection of a beam and a transmitting / receiving terminal in an environment in which transmission / reception points having different protocol structures exist in the same base station in which an RRC connection state of the terminal is maintained A feedback method of measured information, and a method of changing a beam and a transmitting / receiving end, and a method for feeding back measurement information of a beam reference signal by a terminal in the system, which comprises a base station and a transmitting / And a method of changing the beam and the transmitting / receiving end which are in use.

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, a power saving mode operation procedure of a terminal for a system including one or more base stations and one or more terminals, a method for distinguishing a terminal of a base station for transmitting paging to the terminal, Method, and a method, a procedure, and a system in which a plurality of base stations in an area transmit paging information to an individual terminal.

Embodiments of the present invention can provide a system, method, and apparatus for performing beam tracking and beam feedback operations in a beamforming based system. In addition, according to an embodiment of the present invention, a beam management method such as beam measurement information sharing, new beam selection, and beam change in use can be provided in a wireless system in which a base station and a terminal using multiple antennas exist.

1A shows an embodiment of a RAN Paging procedure.
FIG. 1B shows an example of an existing operation procedure of a paging reception method of a power saving state operation terminal.
1C shows a method of using a new RNTI for RAN Paging.
Figure ID shows various methods of constructing RP-TMSI (or new TMSI).
FIG. 1E shows the RAN and CN Paging procedures and the operation of each terminal when RP-TMSI is added.
FIG. 1F shows an embodiment using both RP-RNTI and RP-TMSI.
FIG. 1G shows an example in which the last serving BS simplifies paging using the C-RNTI.
FIG. 1H shows an example in which the last serving BS transmits a C-RNTI in a paging message.
FIG. 1I shows an example of an environment where CN Paging and RAN Paging coexist with different periods and Pagin Occasion.
FIG. 1J shows an example of an environment in which CN Paging and RAN Paging coexist with the same period and Pagin Occasion.
Figure 1K illustrates one embodiment of Minimum / Additional SI modification Period operations.
FIG. 11 illustrates one embodiment of SIU Update operation.
1 m illustrates an embodiment of uplink transmission resource allocation in a paging PDCCH for fast Re-connection.
1n shows another embodiment of the uplink transmission resource allocation in the paging PDCCH for fast Re-connection.
FIG. 10 shows another embodiment of the uplink transmission resource allocation in the paging PDCCH for fast Re-connection.
FIG. 1P shows a Paging PCH Config. FIG. 2 illustrates a fast network reconnection method using the method of FIG.
1 q shows an embodiment of the uplink transmission resource allocation and indicator addition in the paging PDCCH for fast Re-connection
FIG. 1 r shows another embodiment of the uplink transmission resource allocation and indicator addition in the paging PDCCH for fast Re-connection.
FIG. 1 S shows another embodiment of the uplink transmission resource allocation and indicator addition in the paging PDCCH for fast Re-connection.
FIG. 1 (a) shows a paging PCH Config including UL-SCH and Indicator. FIG. 2 illustrates a fast network reconnection method using the method of FIG.
1U is a diagram illustrating an example of a RNTI + Preamble transmission method.
1V shows a Paging PCH Config containing a Dedicated RACH Preamble. FIG. 4 is a diagram illustrating a fast network reconnection method using a network.
1w is a diagram illustrating an example of a Paging Message + Preamble transmission method.
1x shows a fast network reconnection method using a paging message including a Dedicated RACH Preamble.
1Y is a diagram illustrating a terminal according to an embodiment of the present invention.
1Z is a diagram illustrating a base station according to an embodiment of the present invention.
2A is a diagram illustrating a multi-beam system in accordance with an embodiment of the present invention.
FIG. 2B is a diagram illustrating a frame structure for feeding back multi-beam ID and beam measurement values according to an embodiment of the present invention.
2C is a diagram illustrating a frame structure for feedbacking multi-beam ID and beam measurement values according to an embodiment of the present invention.
FIG. 2D is a diagram illustrating a frame structure for feeding back multiple beam ID and beam measurement values according to an embodiment of the present invention. Referring to FIG.
FIG. 2E is a diagram showing an example of a beam change through beam feedback. FIG.
2F and 2G are diagrams showing frame structures for transmitting beam feedback.
FIG. 2H is a view for explaining the operation of the base station and the terminal for changing from the base station beam currently used as the (on, 1) base station beam with the corresponding indicator turned on.
FIG. 2I is a view for explaining the operation of the base station and the terminal when the indicator is an indicator for specifying that the base station can freely change without sending the BCI to the terminal.
FIG. 2J is a view for explaining the operation of the base station and the terminal for the first beam feedback transmission method in accordance with the selection of the used beam at the initial connection.
Referring to FIG. 2K, FIG. 2P is a diagram illustrating a method in which a UE attempts to transmit a beam recovery request when an RLF operation is performed in accordance with a condition2 condition according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with 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 scope 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.

At this point, it will be appreciated that the combinations of blocks and flowchart illustrations in the process flow diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, so that those instructions, which are executed through a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing functions. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory The instructions stored in the block diagram (s) are also capable of producing manufacturing items containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block (s).

In addition, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially concurrently, or the blocks may sometimes be performed in reverse order according to the corresponding function.

Herein, the term " part " used in the present embodiment means a hardware component such as software or an FPGA or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card. Also, in an embodiment, 'to' may include one or more processors.

[Embodiment A: INACTIVE UE ID]

Due to the advent of smartphones, users' smartphone usage is increasing exponentially and there is a growing demand for battery life for these users to continue to use smartphones. This means that efficient power saving technology is required, which requires power saving mode operation of the terminal. Various techniques have been proposed and standardized so that the terminal can operate more power-saving mode more frequently, and to reset the connection with the network more quickly for efficient terminal power saving.

Typical examples are the following systems:

Power Saving State UE operation in sub-state of RRC Connected State.

Power Saving State UE operation in sub-state of RRC IDLE State.

Power Saving State UE operation in new RRC state

LTE Lightly Connected State Operation

5G NR RRC_INACTIVE State Operation

WLAN (IEEE 802.11) Power Save Mode Operation

An embodiment of the base station-based paging method (existing technology) considered in the present patent is as follows. If there is no transmission / reception information for a certain period of time, or if another condition is satisfied, the terminal transits to a lightly connected state (LC: INACTIVE: RRC_INACTIVE state). At this time, the existing IDLE mode and the differentiating point are that the base station and the terminal maintain the terminal connection information (S1 context) and the terminal information without discarding it, and the terminal is still in the RRC_Connected state . The reason for keeping the S1 information in this way is to perform the network reconnection of the terminal very quickly. The MS operating in the power saving state automatically awakens if there is information to be transmitted and reconnects to the network. When the BS receives certain downlink information from the network, the MS reestablishes the connection through the paging of the BS.

In order to perform Paging (RAN based Paging) of a base station, a bundle of base stations transmitting the paging is defined as a RAN Paging Area, and the corresponding information is provided to the UE. A UE that knows the RAN Paging Area information periodically wakes up during a power saving state operation to determine whether it is in a RAN Paging Area that is still known. If the UE is in the RAN Paging Area, it looks at the promised Sub- Or not. If the UE is out of the RAN Paging Area while sleeping, the UE must reconnect to the neighbor BS and perform a RAN Paging Area Update.

FIG. 1A shows an example of the structure of a core network, a base station, and a terminal for RAN paging transmission.

In order to transmit the paging to the UE operating in the power saving state, it is needless to say that a procedure for transmitting the paging message including the delimiter is required.

In the case of the IDLE mode Paging (= CN Paging) transmitted by the existing MME, the P-RNTI is used to specify a sub-frame in which paging exists. A brief procedure is as follows: If there is a terminal to receive any paging, the terminal periodically transmits the P-RNTI value to the PDCCH of the sub-frame received at the predetermined paging occasion.

FIG. 1B shows an example of an existing operation procedure of a paging reception method of a power saving state operation terminal.

≪ Method of specifying RAN paging subframe by defining new RNTI >

A new RNTI different from the existing P-RNTI is defined (RAN Paging RNTI: RP-RNTI), and the base station can paging the terminal using the RP-RNTI.

The UE receiving the PDCCH in one sub-frame can distinguish between CN paging and RAN paging through the P-RNTI and the RP-RNTI, and the corresponding PDSCH is additionally decoded by the corresponding UEs. I can go back. At this time, the P-RNTI and the RP-RNTI may be included in the PDCCH (by scrambling the CRC of the DCI).

[Table 1] shows a new RNTI value, [Table 2] shows an example of using a new RNTI, and FIG. 1C shows a method of using a new RNTI for RAN Paging.

[Table 1]

[Table 2]

<How to distinguish RAN Paging by defining new UE Specific ID>

A new UE Specific ID (RAN Paging TMSI: RP-TMSI) different from the existing S-TMSI and IMSI is defined and the base station can paging the UE using the RP-TMSI.

It can be recognized that the terminal receiving the paging message through the PDSCH in one sub-frame specifies the paging message itself to operate in RAN paging.

Table 3 shows the value of the PagingUE-Identity field including the new UE ID.

[Table 3]

The RP-TMSI may be a unique UE ID under the MME, a unique UE ID in the RAN Paging Area, or a unique UE ID in the eNB.

Figure ID shows various methods of constructing RP-TMSI (or new TMSI).

The method of constructing the RP-TMSI may be as shown in FIG.

FIG. 1E shows the RAN and CN Paging procedures and the operation of each terminal when RP-TMSI is added.

The system uses the same RNTI (P-RNTI) as the RNTI for CN Paging and RAN Paging, and the method for distinguishing the UE by the UE unique ID is shown in FIG. 1E.

<How to use both new RNTI and new UE Specific ID>

FIG. 1F shows an embodiment using both RP-RNTI and RP-TMSI.

The terminal operation procedure in the case of performing RAN paging using both the proposed new RNTI (RP-RNTI) and the new UE Specific ID (RP-TMSI) is as shown in FIG.

&Lt; A method in which base stations in a RAN Paging Area allocate a unique UE ID in a RAN Paging Area >

1. How to set up a management entity and assign it to the management entity

A. Selection of a base station

B. Allocation of MME

2. How to randomly assign without management

3. How the base stations divide the Unique ID Pool and allocate it within it

4. A method in which base stations allocate IDs in a distributed manner and mutually announce them

A. Conflict Resolution Needed

&Lt; Method of Paging a UE Using Different RNTIs between the Last Serving Node and the Neighboring Node >

In the case of the last serving base station that was last accessed before the UE transits to the power saving state, the serving base station carries the C-RNTI of the corresponding UE and maintains the S1 connection for exchanging information between the UE and the Core Network. With this feature, the last serving BS can perform more efficient paging using a different method from other BSs in the RAN Paging Area of the corresponding MS.

The basic operation of the assumption and the terminal is as follows: A terminal operating in a power saving state periodically awakes to check whether the paging information is received by checking the sub-frame promised at the appointed time. For this, the UE periodically re-establishes the downlink synchronization before receiving the sub-frame, selects the cell to receive the sub-frame (same as the cell reselection operation in the conventional IDLE mode), and selects the Camping Cell.

FIG. 1G shows an example in which the last serving BS simplifies paging using the C-RNTI.

Referring to FIG. 1G, BSs in the RAN Paging Area can not use the C-RNTI of the corresponding UE, and thus need to paging the UE using P-RNTI or RP-RNTI. However, You can use paging. In this case, the C-RNTI may be included in the PDCCH (by scrambling the CRC of the DCI), and the Resource Scheduling size (RB size) of the PDCCH including the C-RNTI may be set to zero. The UE operating in the power saving mode periodically generates downlink data to be received when a PDCCH message including a C-RNTI (scrambled with C-RNTI) exists in a sub-frame in the paging occasion to be received. (Assuming that the paging has been successfully received) and attempt to reconnect the network. In this case, it is needless to say that the terminal can perform the above operation when the resource scheduling size is 0 under the additional condition besides the C-RNTI.

FIG. 1H shows an example in which the last serving BS transmits a C-RNTI in a paging message.

Referring to FIG. 1H, when base stations in a RAN Paging Area paging a UE using a P-RNTI, an RP-RNTI, and the like, and transmit a PDSCH Paging Message for specifying a UE, the last serving BS transmits a C- And the like. In this case, other base stations in the RAN Paging Area may use RP-TMSI, S-TMSI, IMSI, etc. instead of C-RNTI.

<How to distinguish RAN based paging by adding Indicator>

There may be a way to distinguish paging by using the existing RNTI and TMSI instead of using the new RNTI and TMSI, and adding indicators to other fields.

To add a 1-bit indicator to the DCI in the PDCCH:

Table 4 shows one-bit RAN Paging indicator for DCI format 1A / 1C, and Table 5 shows two-bit RAN Paging indicator for DCI format 1A / 1C.

[Table 4]

[Table 5]

A method of distinguishing between RAN Paging and CN Paging by adding a 1-bit indicator in addition to the UE identity in the PDSCH is as follows. [Table 6] shows one-bit RAN Paging indicator after Paging-

[Table 6]

Using the indicator, the terminal can distinguish the paging-identity and the paging message from the RAN paging or the CN paging, perform operations according to their own state, and ignore the paging transmitted for other state applications .

<New RAN Paging Discontinuous Reception (DRX) Configuration>

In the new power saving state, the terminal performs a sleep-wake up operation similar to the conventional IDLE mode operation. The discontinuous reception operation of such a terminal is called DRX, and the terminal DRX operation in this power saving state must be signaled and controlled by the base station.

The DRX cycle of such a terminal may be signaled and controlled in the following manner.

[Table 7] shows INACTIVE Paging Cycle under DRX-Config, and Table 8 shows INACTIVE Paging Cycle under PDCCH-Config.

[Table 7]

[Table 8]

In the case where two types of paging such as CN paging and Ran paging coexist, when RAN paging is newly defined and signaling is performed as described above, the system (base station and terminal) can perform a paging occasion and a paging cycle And RAN paging can be configured and used. In this case, the UE operating in the Power Saving State may use only the RAN Paging period, and the UE operating in the IDLE mode may use only the CN paging period. In addition, it is needless to say that a terminal desiring more frequent and quick paging reception such as SI Update or radio link failure recovery (cell reselection) can examine both paging occasions regardless of the state of the terminal. Of course, in this case, power consumption may be added to the case of receiving only one type of paging due to frequent paging of the terminal.

FIG. 1I shows an example of an environment where CN Paging and RAN Paging coexist with different periods and Pagin Occasion.

CN paging and RAN paging have different cycles. An example of a UE operating in and out is shown in FIG.

On the other hand, configuring CN Paging and Ran Paging in the same period. So that terminals having different states (IDLE and power saving) can be simultaneously awakened. In this case, if there is a new RAN Paging Drx config, the value can be set to be the same as that of CN Paging. It is needless to say that it is also possible to utilize the existing CN Paging Config for RAN paging.

This embodiment and config. &Lt; RTI ID = 0.0 &gt; reusing &lt; / RTI &gt; CN Paging to RAN Paging. Are described in [Fig. 1J] and [Table 9].

FIG. 1J shows an example of an environment in which CN Paging and RAN Paging coexist with the same period and Pagin Occasion, and Table 9 shows RadioResourceConfigCommon field descriptions.

[Table 9]

Alternatively, an indicator may be provided to inform the UE that the CN Paging and RAN Paging in the PCCH Config are the same.

Table 10 shows the INACTIVE Paging Cycle under PDCCH-Config with indicator, and Table 11 shows RadioResourceConfigCommon field descriptions.

[Table 10]

[Table 11]

&Lt; Method of deleting terminal information from terminal, base station and network >

The unique information and the network connection information of a terminal operating in a power saving state must be deleted from the terminal and the base station when the terminal transits to the IDLE state or is unable to use the network due to unavoidable change. The information deletion timing of the terminal and the network may be a case of satisfying various conditions, and these conditions are as follows:

1) When the UE is re-connected to the other cell

- When the UE itself is re-connected to the other cell and reconfigured

- When the other cell is transmitted to the UE, the UE is re-connected.

2) When the UE updated paging area

- When the UE itself is moved out of the RAN paging area and successfully updated paging area

- When the other cell transmits a signal to the RAN paging area.

3) When UE state changes into IDLE mode (UE operation)

- By the eNB indication signal (RRC message, MAC message, ...)

- By the channel quality degradation measurements.

- if RSRP, RSRQ, CQI, SINR, SNR, of the serving channel <threshold1

RSRP, RSRQ, CQI, SINR, SNR, of the serving channel <last measured RSRP, RSRQ, CQI, SINR, SNR, of the serving channel threshold2

- By a timer expiration

- Timer started at the last successful data tx / rx, at the last channel measurement, at the last channel measurement result> threshold, ...

4) When the eNB detects a UE is no longer in the power saving state

- By the number of paging retransmission reaches the max. threshold3

- By the channel quality degradation measurements.

- if RSRP, RSRQ, CQI, SINR, SNR, of the serving channel <threshold1

RSRP, RSRQ, CQI, SINR, SNR, of the serving channel <last measured RSRP, RSRQ, CQI, SINR, SNR, of the serving channel threshold2

- By a timer expiration

- By a number of NACK (or No ACK). threshold4

<How to send paging for System Information Update>

In 5G, System Information can be divided into two or more Components. Among them, the minimum system information for the network connection periodically transmitted may be referred to as Minimum SI, and the system information that can be transmitted by other broadcasting or unicasting (on-demand) may be referred to as an additional SI. In this case, the Minimum SI and the Additional SI may be updated at the same cycle, and only one of them may be updated.

In order to update the different system information, the next standard may set the system information update period to two or more different. In such a case, different system information update cycles may be as follows.

[Table 12] shows minimum / additional SI update periods in TS36.331, and Table 13 shows minimum / additional SI update periods in TS36.331.

[Table 12]

[Table 13]

Figure 1K illustrates one embodiment of Minimum / Additional SI modification Period operations.

The operation of updating the different system information may be separately performed so that different periods are not overlapped with each other at different times. One such embodiment may be as shown in FIG. 1k. If the system information update and the change notification for the system information are performed in such a non-overlapping time, the terminal can update only the corresponding information in the period after receiving the specific change notification, so that it is not necessary to update all the system information. In addition, it is needless to say that the operation of such a period can be allocated such that different periods overlap at the same time.

In order to update the different system information, the system may transmit paging messages including a change notification immediately before the modification period in which the system information is actually updated. The paging message may be CN paging, RAN paging, or both.

The terminals connected to the network, operating in the power saving mode in the network, or camped in the network receive the paging information and update the system information in the next modification period.

At this time, the system information update notification included in the paging message can be divided into a minimum SI and an additional SI application, which can be reflected in the terminal operation as follows.

Table 14 shows the Minimum / Additional SI update of UE in TS36.331.

[Table 14]

Alternatively, if the reception of additional SI information is operated on-demand by a UE request:

Table 15 shows the Minimum / Additional SI update of UE in TS36.331.

[Table 15]

In addition, when receiving the paging information including the change notice indicating that the system information is to be changed soon, it can be considered that the paging information receiving period is smaller than the modification period in which the change notification is continuously transmitted (Paging cycle <modification period). In this case, the UE receives a paging message including the same change notification every time, and this information is not only redundant but also consumes power of the UE. Therefore, if only the paging message including the first notification is decoded by the UE and paging messages including only the same SI Update change notification are distinguishable and can be ignored among the paging messages transmitted within the same modification period, Of course, can be saved.

To this end, we propose the following new paging information separator (SIU-RNTI). SIU - RNTI is used if the paging is only for SI update notification

- If the paging contains other info. such as data paging, SIU-RNTI can not be used (P-RNTI can be used)

- UE which received SI update once, can ignore the other SIU-RNTI during the same BCCH modification period.

Table 16 is the new RNTI value for SI Update, and FIG. 11 shows one embodiment of the SIU Update operation.

[Table 16]

&Lt; a method in which a terminal operating in a power saving state quickly reconnects to a network &

There are various ways for a terminal operating in a power saving state to quickly reconnect to a network. The methods considered in this patent are methods that can be used when the distance between the transmitting / receiving end is relatively short so that the characteristics of the uplink and the downlink channel are similar and the synchronization is similar. In this method, uplink resources are occupied in the downlink paging information , The UE directly performs uplink transmission without a special uplink synchronization operation ( e.g. , RACH ) . The detailed procedure is as follows:

1. Uplink transmission resource allocation method in paging PDCCH for fast re-connection:

The base station transmits an UL-SCH resource reservation for a response of the UE (or a resume request transmission of the UE) in the paging PDCCH, and the receiving UE recognizes that the corresponding paging message is the UE's network reconnection request indication via UL-SCH config.)

A. Example 1) C-RNTI + Paging PCH + UL SCH config.

1 m illustrates an embodiment of uplink transmission resource allocation in a paging PDCCH for fast Re-connection.

i. A base station in which a C-RNTI previously used (or promised) is present (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI to a terminal operating in a corresponding power saving state . (connection resume)

ii. In this case, the UL-SCH config resource is paged in PCH config. The paging message shall be allocated more than 3 TTIs later than the transmission resource allocated by the paging message.

iii. The MS receiving the message receives paging information through the paging PCH and transmits a connection resume request to the UL-SCH.

iv. Connection resume request Upon successful completion of transmission / reception, the network and the UE recognize that the connection is completed, and transit the UE state to RRC_CONNECTED.

B. Embodiment 2) C-RNTI + UL SCH config.

1n shows another embodiment of the uplink transmission resource allocation in the paging PDCCH for fast Re-connection.

i. A base station in which a C-RNTI previously used (or promised) is present (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI to a terminal operating in a corresponding power saving state . (connection resume)

ii. The MS receiving the message transmits a connection resume request to the UL-SCH.

iii. Connection resume request Upon successful completion of transmission / reception, the network and the UE recognize that the connection is completed, and transit the UE state to RRC_CONNECTED.

B. Example 3) RNTI + Paging PCH + UL SCH config.

FIG. 10 shows another embodiment of the uplink transmission resource allocation in the paging PDCCH for fast Re-connection.

i. The base station transmits a paging PDCCH using the RNTI, thereby requesting the terminal operating in the power saving state to resume connection to the network. (connection resume)

ii. In this case, the UL-SCH config resource is paged in PCH config. The paging message shall be allocated more than 3 TTIs later than the transmission resource allocated by the paging message.

iii. Upon receiving the message, the UE receives the paging information through the paging PCH, and transmits a connection resume request to the UL-SCH if the received UE- specific id is included in the received information .

iv. Connection resume request Upon successful completion of transmission / reception, the network and the UE recognize that the connection is completed, and transit the UE state to RRC_CONNECTED.

FIG. 1P shows a Paging PCH Config. FIG. 2 illustrates a fast network reconnection method using the method of FIG.

The above operation is shown in FIG.

1. Paging for Fast Re-connection In the uplink transmission resource allocation and indicator addition method in the PDCCH,

The BS transmits an UL-SCH resource reservation for a response of the UE (or a resume request transmission of the UE) in the paging PDCCH, and transmits an indicator including a request for reconnection to the UE using the resource. The receiving terminal recognizes that the corresponding message is a network reconnection request of the terminal (an explicit indication). In this case, the indicator may be included in the UL-SCH config.

A. Example 1) C-RNTI + Paging PCH + UL SCH config.

FIG. 1Q shows an embodiment of an uplink transmission resource allocation and indicator addition in a paging PDCCH for fast Re-connection.

i. A base station in which a C-RNTI previously used (or promised) is present (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI to a terminal operating in a corresponding power saving state . (connection resume)

ii. In this case, the UL-SCH config resource is paged in PCH config. The paging message shall be allocated more than 3 TTIs later than the transmission resource allocated by the paging message.

iii. The MS receiving the message receives the paging information through the paging PCH, and transmits a connection resume request to the UL-SCH if the re-connection request indicator is a predetermined value (usually 1).

iv. Upon successful transmission / reception of the network reconnection request, the network and the terminal recognize that the connectivity is completed, and transit the terminal state to RRC_CONNECTED.

B. Embodiment 2) C-RNTI + UL SCH config.

FIG. 1 r shows another embodiment of the uplink transmission resource allocation and indicator addition in the paging PDCCH for fast Re-connection.

i. A base station in which a C-RNTI previously used (or promised) is present (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI to a terminal operating in a corresponding power saving state . (connection resume)

ii. The MS receiving the message transmits a connection resume request to the UL-SCH if the re-connection request indicator is a predetermined value (usually 1).

iii. Upon successful transmission / reception of the network reconnection request, the network and the terminal recognize that the connectivity is completed, and transit the terminal state to RRC_CONNECTED.

C. Example 3) P-RNTI + Paging PCH + UL SCH config.

FIG. 1 S shows another embodiment of the uplink transmission resource allocation and indicator addition in the paging PDCCH for fast Re-connection.

i. The base station transmits a paging PDCCH using the RNTI, thereby requesting the terminal operating in the power saving state to resume connection to the network. (connection resume)

ii. In this case, the UL-SCH config resource is paged in PCH config. The paging message shall be allocated more than 3 TTIs later than the transmission resource allocated by the paging message.

iii. The UE receiving the message receives the paging information through the paging PCH. If the re-connection request indicator is the promised value (usually 1) and the UE's specific id is included in the received information, the UL-SCH A connection resume request is transmitted.

iv. Upon successful transmission / reception of the network reconnection request, the network and the terminal recognize that the connectivity is completed, and transit the terminal state to RRC_CONNECTED.

FIG. 1 (a) shows a paging PCH Config including UL-SCH and Indicator. FIG. 2 illustrates a fast network reconnection method using the method of FIG.

The operation procedure is shown in Fig.

1. Dedicated preamble that can be used for limited uplink access request is allocated to allow the terminal to perform fast network connection

A. RNTI + Preamble transmission method

1U is a diagram illustrating an example of a RNTI + Preamble transmission method.

i. The RNTI receiving terminals, if their UE specific id is included in the received information , start the RACH using the dedicated preamble and indicate that the corresponding RACH is the RACH for the UL reconnection request.

ii. The BS receiving the Dedicated RACH Preamble recognizes that the UE performs the network reconnection request, reconfigures and resumes the connection.

 1V shows a Paging PCH Config containing a Dedicated RACH Preamble. FIG. 4 is a diagram illustrating a fast network reconnection method using a network.

B. Paging Message + Preamble transmission method

1w is a diagram illustrating an example of a Paging Message + Preamble transmission method.

i. The UEs receiving the paging message in the paging PCH start the RACH using the dedicated preamble when the UE specific id is included in the received information, and indicate that the corresponding RACH is the RACH for the UL reconnection request.

ii. The BS receiving the Dedicated RACH Preamble recognizes that the UE performs the network reconnection request, reconfigures and resumes the connection.

1x shows a fast network reconnection method using a paging message including a Dedicated RACH Preamble.

<Direct transmission method of DL data using RNTI>

When short information is to be transmitted in downlink to a terminal operating in a power saving state, the network identifies a terminal using a known C-RNTI (or another new RNTI), assigns downlink resources to the terminal, Can be transmitted.

In this case, if the UE does not need uplink synchronization through random access, the base station allocates uplink ACK / NACK resources for downlink transmission, receives a response from the UE, and performs retransmission and HARQ operations to perform DL transmission The success rate can be increased.

In this case, if the UE needs to perform uplink synchronization through random access, the base station can increase the success rate by repeatedly transmitting the downlink transmission using a repetition over a predetermined number of times.

1Y is a diagram illustrating a terminal according to an embodiment of the present invention.

Referring to FIG. 1 Y, the terminal 5000 may include a transmission / reception unit 5010 and a control unit 5030 for transmitting and receiving signals. The terminal 5000 can transmit and / or receive signals, information, messages, and the like through the transmission / reception unit 5010. The control unit 5030 can control the overall operation of the terminal 5000. The control unit 5030 may include at least one processor. The controller 5030 can control the operations of the terminal described with reference to FIGS. 1A through 1X.

The controller 5030 receives the beam feedback trigger condition and determines whether the beam feedback trigger condition is satisfied. If it is determined that the beam feedback trigger condition is satisfied, Based on the beam feedback trigger, to transmit a control element (MAC CE) including beam feedback information. The beam feedback trigger condition may include a case where the channel measurement value of at least one beam is greater than a sum of a predetermined threshold value and a channel measurement value of the current serving beam.

In addition, if the uplink of the UE is synchronized, the controller 5030 can control to transmit the beam feedback information using the UL allocation resources received through a scheduling re-order (SR) procedure. The terminal may transmit the SR and receive information on resources allocated for beam feedback based on the SR transmission. Resource allocation may be performed periodically or non-periodically.

In addition, if the uplink of the UE is not synchronized, the controller 5030 may control to transmit the beam feedback information through a random access procedure. When the beam feedback is triggered, transmitting a random access preamble, receiving a random access response in response to a random access preamble transmission, transmitting the beam feedback information based on receiving a random access response, It is possible to control to receive the random access contention result. The message transmitting the beam feedback information may be MSG3 in the random access procedure.

In addition, the controller 5030 receives the beam change instruction information, and upon receiving the beam change instruction information, controls the beam controller 5030 to change the beam based on the beam feedback information after a predetermined time.

1Z is a diagram illustrating a base station according to an embodiment of the present invention.

Referring to FIG. 1Z, the base station 5100 may include a transmission / reception unit 5110 and a control unit 5130 for transmitting and receiving signals. The base station 5100 can transmit and / or receive signals, information, messages, and the like through the transmission / reception unit 5110. The control unit 5130 can control the overall operation of the base station 5100. The control unit 5130 may include at least one processor. The controller 5130 can control the operation of the base station described with reference to FIGs. 1A through 1X.

In addition, the controller 5130 may transmit a beam-feedback triggering condition to the terminal and control the terminal to receive a medium access control (CE) control element (CE) including beam-feedback information. The beam-feedback information may be triggered when it is determined that the beam-feedback condition is satisfied in the MAC layer of the UE. That is, the beam feedback condition can be triggered according to the determination of the MAC layer of the UE. The beam feedback trigger condition may include a case where the channel measurement value of at least one beam is greater than a sum of a predetermined threshold value and a channel measurement value of the current serving beam.

In addition, if the uplink of the UE is synchronized, the controller 5130 allocates uplink resources to the UE through a scheduling re-order (SR) procedure, and outputs the beam feedback information from the allocated uplink resources Can be controlled.

In addition, if the uplink of the UE is not synchronized, the controller 5130 can control to receive the beam feedback information through a random access procedure. Receiving a random access preamble from the terminal, transmitting a random access response based on a random access preamble reception, receiving the beam feedback information in response to a random access response transmission, And control the transmission of the results. The message receiving the beam feedback information may be MSG3 in the random access procedure.

In addition, the controller 5130 transmits the beam change instruction information based on the reception of the beam feedback information. When the beam change instruction information is transmitted, the controller 5130 controls to change the beam based on the beam feedback information after a predetermined time have.

[Example B: Beam Grouping]

According to an embodiment of the present invention, there is provided a beam management method for a terminal and a base station, the method comprising: transmitting a beam measurement information to a base station by a terminal; selecting a beam to be used based on beam measurement information of the terminal received by the base station; Informing the terminal of the beam information to be used, and changing the beam currently used by the base station and the terminal to a new beam.

According to an embodiment of the present invention, there is also provided a method of transmitting a beam change message to a base station, the method comprising: an indicator for indicating whether a beam change message needs to be transmitted when the base station changes the beam to each beam in the step of transmitting the beam measurement information to the base station And a beam changing method of a base station using such an indicator.

Hereinafter, embodiments of the present invention will be described in detail.

With the advent of smart phones and the like, the amount of user data usage is increasing exponentially, and the demand for such data usage is increasing. This means that high bandwidth is needed and high frequency usage is required. However, the higher the frequency, the higher the signal attenuation by distance. That is, if a center frequency of 30 GHz or more is used, reduction of coverage of the base station due to signal attenuation is inevitable. There is also a problem that the use of a large number of beams is required due to the reduction of the coverage and the delay due to the use of many beams increases.

The wireless communication system considers a structure in which a single base station including a plurality of transmitting / receiving terminals capable of transmitting / receiving to support a wide physical area for improving the delay due to frequent exchange of terminal information and efficiently using resources.

Typically, there are the following systems:

A Distributed Antenna System (DAS) that transmits or receives the same signal by simply implementing a different physical transmission / reception terminal under one base station,

A remote radio head (RRH) system capable of transmitting and receiving different signals by implementing different transmit / receive stations under one base station with an antenna and a simple radio frequency (RF)

When one transmitter / receiver under one or different base stations synchronizes and transmits the same information to one user at the same time, or while one transmitter / receiver is transmitting / receiving information, the other transmitter / And Coordinated Multi-point Transmission / Reception (CoMP) systems.

The beamforming techniques and systems contemplated in embodiments of the present invention are as follows:

A. Analog Beam Forming:

Beamforming, which uses multiple array antennas to transmit different transmit powers and phases to superimpose the radiation patterns of the antennas to physically obtain antenna gain with directionality in a specific direction

Beam can be set from multiple antennas in desired direction without channel information of target receiver

Only transmit / receive in one direction at a time (radiation pattern in the other direction is offset

It is possible to form a beam with a large antenna gain (beam width / length difference according to the number of antennas)

B. Digital Beam Forming:

A technique of forming a plurality of orthogonal beams that cancel different interchannel interference by applying different coding to each pre-transmission information by using multi-channel information between antennas having different intensities in a multi-antenna transmission / reception environment

Using the pre-coding for the data transmitted by each antenna, the different channel characteristics are utilized as much as possible.

Single-user MIMO support and multi-user MIMO support

C. Hybrid Beam Forming:

A technology that uses analog beamforming and digital beamforming simultaneously.

A technique of using digital beamforming using different pre-coding techniques for each antenna for beam and transmission antennas formed by analog beamforming.

The techniques described in the embodiments of the present invention can be one of techniques using beam and beamforming formed by the analog beamforming, the digital beamforming, and the hybrid beamforming. Also, a method for occupying and transmitting any resource that can be classified into physical or frequency / time / code / signal for information transmission is referred to as beamforming, and applicable to all systems in which the occupied resources are called beams.

In addition, the related technologies used in the wireless communication technology conforming to the 3GPP standard are as follows.

A. Uplink, uplink transmission (transmission from a station to base station) transmission:

Basically, it should be transmitted using reserved resources through resource allocation of base station (eNB)

A UE requiring uplink transmission may receive a resource for uplink transmission by transmitting a resource allocation request (SR) allocated in advance by the base station (specifically, a resource allocated to a base station a random access channel (RACH) capable of transmitting contention-based data with other UEs, and transmitting the random access channel (RACH) ) Must be sent via

B. Channel measurement information feedback:

A conventional technique for notifying the base station of channel information measured by the UE includes channel measurement and feedback performed in the physical layer. Examples of such information include reference signal received power (RSRP), reference signal received quality (RSRQ), signal-to-noise ratio (SNR), signal to noise and interference (SINR), a channel quality indicator (CQI), a channel state inforamtion-reference signal (CSI-RS), and the like . This information can be obtained by measuring the signal (CRS (cell specific reference signal or common reference signal), dedicated reference signal (DRS), CSI-RS, or demodulation reference signal (DMRS)) transmitted from the base station.

The UE can transmit the acquired information using resources allocated by the BS according to the UL transmission rule. Without the resources allocated by the base station, it is a conventional wireless communication technology that there is no need to provide or provide such information to the base station.

In order to improve the efficiency of existing wireless communication systems, signals for maintaining connectivity such as control signals and reference signals are transmitted using common frequency channels and time resources for all users to listen to.

On the other hand, in the case of a multi-antenna using beamforming system in which resources such as frequency channels, time, beams, and codes are differently allocated and used for different beams, a beam characteristic (direction, Channel, etc.) may cause the resource to be unusable.

For example, in a system in which a plurality of analog beams are used for transmission / reception, a terminal and a base station transmit / receive information by selecting a specific beam estimated to have a high performance. At this time, the base station reserves the best (or most problematic) beam resource known to the base station at the time of reserving the resource, in order to reserve resources for uplink transmission of the terminal. However, changes in the channel of the reserved beam resource may occur due to terminal movement or other variables (e.g., sudden traffic obstacles, climate change, etc.). When the uplink information transmission fails due to the change in the characteristics of the reserved beam resource, there is no way to quickly solve the problem with the existing technology.

Therefore, in the case of a multi-antenna beamforming system in which different resources such as frequency channel, time, beam and code are allocated and used for different beams, beam status information exchange between the terminal and the base station and fast beam changes can be tracked and applied A beam management technique is required.

In addition, in the case of the existing technology for transmitting the signals for maintaining the connectivity such as the control signal and the reference signal using the frequency channels and the time resources that are commonly receivable for all users, if the channel state being used becomes poor, The method is a method of changing to another channel of the other frequency when another channel of another frequency exists, or attempting to reconnect to the network after declaring a failure if the radio link failure condition is satisfied .

However, in the case of a beamforming system using multiple antennas in which different resources such as frequency channels, time, beams, and codes are allocated and used differently for different beams, even if the characteristics of the beams used are poor, There is a high probability of existence, and an opportunity to maintain the connectivity through this is given to the terminal, and a technology that can utilize it is needed.

In the case of existing technologies (such as Omni antenna use, digital beamforming systems, etc.), if the channel conditions are getting worse, the way to overcome them is to change to another channel of another frequency, RLF) condition is satisfied, there is no way to attempt to reconnect to the network after the failure is declared.

However, in a system using analog beamforming, even if the channel state of the beam used is bad, there is a high possibility that another beam usable at the same position exists and the connection can be maintained.

In the prior art, a UE is a channel information feedback in which only a physical layer can provide a resource that is being used in a Node B, in particular, a channel state change notification to the Node B. In this conventional technique, the UE receives the specific signal (CRS, DRS, RS, Beam RS, CSI-RS, etc.) transmitted from the base station and grasps the channel state, (PUCCH), a physical uplink shared channel (PUSCH), or the like) to the base station by using a resource capable of uplink transmission, which is allocated by the base station after the CQI, RI, PMI, (Or a resource allocation request for uplink transmission) to the base station and then allocate resources and transmit channel state information.

However, in the case of a multi-antenna beamforming system in which different resources such as frequency channel, time, beam, and code are allocated and used differently for different beams, unique resources (e.g., analog beams, hybrid beams Etc.), it is necessary to notify the base station of other available resource information and allocate the resource to the base station in the future.

2A is a diagram illustrating a multi-beam system in accordance with an embodiment of the present invention.

Referring to FIG. 2A, a system according to an exemplary embodiment of the present invention includes a base station and an MS to form analog beams having various directions. Here, the analog beam used by the base station and the terminal may be composed of a plurality of small antenna arrays, and wireless transmission / reception can be performed in one direction using one antenna array group at a time. At this time, if one or more antenna array groups are simultaneously operable, radio transmission / reception can be performed in more than one direction at a time.

In the embodiment of the present invention, in a multi-antenna using beamforming system in which resources such as a frequency channel, time, beam, and code are differently allocated and used for different beams, one or more base stations (or transmitting / And an environment in which one or more beams are used to transmit / receive using a pair of beams at a time is considered as a basis. In addition to this, the base station or the terminal does not use a plurality of beams, for example, one or more base stations, one terminal uses one beam, or one base station and one terminal uses one or more beams A possible beam information exchange method is proposed.

In more detailed operation, the terminal exchanges beam information in use in the same base station (or transmitting / receiving end) through three steps of 1) measurement of beam information, 2) provision of beam information, and 3) At which time a suitable beam is found and the corresponding beam can be used. In a multi-antenna beamforming system that allocates and uses resources such as frequency channel, time, beam, and code differently for different beams, the base station and the terminal detect the channel status of the transmit / receive beam in real time, Be able to maintain and change the beam. The following actions are required for this.

A. Beam Measurement

- The beam measurement is performed to measure the channel of beam pairs that can result in a combination of various beams between the terminal and the neighboring base station.

The beam measurement may be periodic or aperiodic, and may be performed by a terminal or a base station.

The embodiment of the present invention is not limited by any beam measuring method, and it can be assumed that the terminal or the base station can measure the channel state of the beam pairs with each other.

In the embodiment of the present invention, the terminal performs an operation of measuring beam information in a certain manner, and as a result, performs an operation of updating and measuring the measured value according to each beam information measurement The environment can be assumed.

B. Beam Feedback or Beam Reporting

- Beam feedback is an act of informing the base station of the beam information measured by the terminal.

- Feedback from the terminal (or base station) is essential because the base station (or terminal) that is the transmitting terminal can not know the downlink (or uplink) beam information.

The beam information feedback may be periodic or aperiodic, and may be performed by a terminal or a base station.

- The embodiment of the present invention mainly describes the operation of transmitting the beam information measured by the terminal to the base station. However, the scope of the present invention is not limited to the beam feedback of the terminal or the reporting, but may be applied correspondingly to the operation of transmitting the measured beam information to the terminal. Therefore, procedures for beam feedback and beam modification of the terminal below can be applied equally / similarly to the operation of the base station.

In the embodiment of the present invention, the beam feedback information, the beam feedback information may be beam state information (BSI), and may be beam refinement information (BRI).

C. Change Beam

The base station or the terminal can determine a beam pair to be used in future based on the received beam feedback information.

The base station or terminal may perform various operations to use the determined beam pairs.

The operation and proposed procedures of the present invention will be described below using various specific embodiments.

A terminal (UE), which is referred to in the following embodiments, refers to a beam measurement subject that performs beam measurement, and a base station (eNB) transmits a reference signal for beam measurement, It refers to a beam-using subject that uses the beam information through measurement, when the subject informs the beam through feedback, and allocates resources to the subject.

In the embodiment of the present invention, the terminal and the base station are used as a beam measurement and feedback performing entity, a beam reference signal transmission and a resource allocation entity, but their roles are not limited to the terminal and the base station. The base station may be a subject performing beam measurement and feedback, and the terminal may be a subject that transmits a beam reference signal or allocates resources.

In the following embodiments, the best beam (or the best beams) refers to a beam measuring subject and a beam-using subject, which are assumed to have the best performance among the analog beams that can be used by the beam- (Or pairs of beams) consisting of the beams of these two subjects when one beam of beams is determined, or may mean two beams in a beam pair (or beam pairs), respectively. In the embodiment of the present invention, the best beam is generally used in order to communicate with a beam measuring subject (terminal) in a beam-using subject (base station) within a best beam pair measured according to a reference signal transmitted by a beam- However, the present invention is not limited to this, and may mean various examples of the best beam described in the embodiment of the present invention.

The beam measuring subject may inform all the information of the best beam pair (or pairs of beams) to the beam-using subject through feedback, or may notify only one beam information to be used by the beam-using subject to the corresponding beam-measuring subject. (E.g., the terminal may inform only one beam information belonging to the base station to be used when the base station transmits / receives information to / from the terminal)

FIG. 2B is a diagram illustrating a frame structure for feeding back multi-beam ID and beam measurement values according to an embodiment of the present invention.

Referring to FIG. 2B, an embodiment of a MAC-CE structure for transmitting N beam information (ID 9 bits, BRSRP 7 bits) can be confirmed.

- BI (9-bit): Field indicating the beam index.

- BRSRP (7-bit): Field indicating the RSRP of the beam.

In the embodiment of FIG. 2B, the BI is represented by 9 bits and the BRSRP by 7 bits. However, the fields may be of different sizes.

2C is a diagram illustrating a frame structure for feedbacking multi-beam ID and beam measurement values according to an embodiment of the present invention.

Referring to FIG. 2C, an embodiment of a MAC-CE structure for transmitting N beam information (eNB beam ID 3 bits, BRSRP 7 bits) can be confirmed.

- RBI (3-bit): A field indicating the beam index.

- RB-RSRP (7-bit): field indicating the receiving RSRP of the beam.

- R: reserved bit, set to "0". In the embodiment of FIG. 3, the RBI is 9 bits and the RB-RSRP is 7 bits. However, each of the fields may be a different number of bits.

FIG. 2D is a diagram illustrating a frame structure for feeding back multiple beam ID and beam measurement values according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 2D, an embodiment of a MAC-CE structure for transmitting N beam information (eNB ID 9 bits, UE ID 5 bits, BRSRP 7 bits) can be confirmed.

- BI_1 (9-bit): field indicating the beam index of the base station.

- BI_2 (9-bit): field indicating the beam index of the terminal.

- BRSRP (7-bit): Field indicating the RSRP of the beam.

5 is a diagram illustrating a frame structure for feeding back multi-beam ID and beam measurement values according to an embodiment of the present invention.

In an embodiment of the present invention, the following method is proposed to improve information exchange efficiency with a base station while minimizing information transmitted from the terminal to the base station.

<How to Add an Indicator to Request Beam Change Information Sending>

Fig. 2E is a diagram showing an example of beam changing through beam feedback, and Figs. 2F and 2G are diagrams showing frame structures for transmitting beam feedback. Fig.

The terminal has channel pair / link measurement values for the transmission beam of each base station and the reception beam pair of the terminal through the measured and measured information. Based on the channel measurement values, the UE feeds back measurement values and base station beam ID information for several top or most good base station beams. When providing only the base station beam information to the base station, When a certain base station uses a beam, it does not have information about which beam the terminal uses to receive the beam. In other words, if the base station desires to change to a new beam from the currently used beam at the time of receiving the corresponding beam feedback information, the base station informs the terminal that the beam should be changed to the corresponding beam, It is needless to say that it is necessary to perform the operation of changing the beam by waiting until the time when the terminal and the terminal agree with each other.

When the beam change request message is a Beam Change Indication message (BCI), an example of a corresponding operation procedure is shown in FIG. 2E.

As shown in FIG. 2E, when only the beam information of the base station is fed back without the beam information of the terminal, the beam change request message is transmitted / received for each beam change and the beam is changed by waiting until the appointed time. However, if the terminal does not need to specifically change the beam, the waiting time for transmitting the beam change request message and changing the beam is wasted. Actually, in a system environment considering multi-path and separated transmission reception points, a terminal may receive multiple beams of the same cell using one Rx beam. In this case, if the Rx beam information of the corresponding terminal is not included in the beam measurement information fed back to the base station, it is impossible to distinguish the case where the beam change request message (BCI) is not sent as described above. The BCI is transmitted and the beam change is performed after a predetermined time.

In order to eliminate the waste, the present invention proposes a method of transmitting beam feedback by adding an indicator of one bit to the beam information of the base station as shown in FIGS. 2F and 2G.

FIGS. 2F and 2G show examples of a method of adding a 1-bit indicator to one base station beam feedback and transmitting the same.

The indicator may provide terminal beam information to the base station and may be used in the following manner.

A. When the base station changes the used beam with the corresponding beam, it is an indicator that the beam change request message should be transmitted to the terminal.

The terminal can manage the measured beam pair information with the following table:

[Table 17] is a beam pair measurement information management table of the terminal.

[Table 17]

The terminal generates beam-feedback information to be transmitted to the network in a descending order of beam pairs having the best performance (best quality, best RSRP, RSRQ, CQI, SNR, SINR, ...) :

 Table 18 is an example of beam-pair measurement information feedback of K terminals.

[Table 18]

If the UE Rx beam ID of the beam measurement information feedback table is equal to the currently used serving beam ID (the last beam ID), the indicator is set to 0, and in other cases, the indicator is set to 1.

Alternatively, when the UE Rx beam ID of the beam measurement information feedback table is Rx beams that can be received by the UE at the same time, the same indicator may be allocated, and in the case of Rx beams that can not be simultaneously received, different indicators may be allocated.

[Table 19] shows an example in which an indicator is included in the beam-pair measurement information feedback of the K terminals when the serving beam ID currently used by the terminal is 1.

[Table 19]

Removing the UE Rx beam ID from the information completes the beam feedback information.

Table 20 is an example of beam-pair measurement information feedback of the K terminals when the serving beam ID currently being used by the terminal is 1.

[Table 20]

FIG. 2H is a view for explaining the operation of the base station and the terminal for changing from the base station beam currently used as the (on, 1) base station beam with the corresponding indicator turned on.

In this case, the corresponding indicator (1) is an indicator indicating that communication is possible when the corresponding indicator is on, in the case of a beam, using a terminal beam different from the terminal beam currently being used by the terminal.

At this time, when the indicator is turned off (off, 0) from the currently used base station beam as the base station beam, the base station can arbitrarily change it without providing any information to the terminal. When the base station arbitrarily changes the beam without providing any information, the time consuming time such as promising and waiting for the BCI transmission and the beam change is reduced to the terminal, and efficient and fast beam change becomes possible.

In addition, if the indicator is the same, it is also possible that the terminal may indicate the base station beams simultaneously receivable. In this case, it is of course also possible that the UE may indicate that it can simultaneously receive base beams indicated by the corresponding rx beam (or available simultaneously receivable rx beams) by the corresponding indicator. In this case, it is needless to say that the base station can perform transmission to the mobile station by utilizing two or more base station beams simultaneously indicated by the indicator.

The operation procedure in the case of using the proposed technique is shown in FIG. 2H.

In this case, if the indicator changes to a non-1 beam, the BCI transmission / success and latency can be omitted, reducing latency.

In addition, it is needless to say that the indicator may indicate the base station beams simultaneously received by the terminal. In this case, it is to be understood that the UE may indicate that it can simultaneously receive the base station beams indicated by the corresponding rx beams (or rx beams). In this case, it is needless to say that the base station can perform transmission to the mobile station by utilizing two or more base station beams simultaneously indicated by the indicator.

B. If the base station changes the beam using the corresponding beam, an indicator indicating that the beam can be freely changed at any time without any special message

FIG. 2I is a view for explaining the operation of the base station and the terminal when the indicator is an indicator for specifying that the base station can freely change without sending the BCI to the terminal.

2I, in contrast to FIG. 2H, the indicator may be an indicator that the BS can freely change the BS without sending the BCI to the MS.

It is a matter of course that the base station transmission beams having the indicator of 0 may be simultaneously used by the base station and used for MIMO transmission to the mobile station.

C. Indicator that indicates that the terminal can receive at the same time even if the base station simultaneously uses the beam as a transmission beam.

When the indicator indicates that the UE can simultaneously receive: It is of course possible to indicate that the UE can simultaneously receive the base station beams indicated by the corresponding indicator using the same rx beam (or rx beams). In this case, it is needless to say that the base station can simultaneously transmit two or more base station beams indicated by the indicator to the mobile station.

In addition, the indicator does not necessarily have to be 1 bit, and an indicator of the same value may indicate a plurality of beams that can be simultaneously transmitted.

Also, the indicator may be used as any arbitrary beam group ID set by the terminal. In this case, the BS recognizes that the BS has divided the BS beam into groups, identifies different groups, and performs a specific operation Of course).

If the UE can operate one Rx beam at a time and beam transmission of different base stations can be simultaneously received using the corresponding Rx beam, a method of generating feedback information including the beam indication of the UE is as follows

[Table 21] is a beam pair measurement information management table of the terminal.

[Table 21]

The terminal generates beam-feedback information to be transmitted to the network in a descending order of beam pairs having the best performance (best quality, best RSRP, RSRQ, CQI, SNR, SINR, ...) :

 Table 22 is an example of beam-pair measurement information feedback of K terminals.

[Table 22]

Table 22 is a table in which measured information grouped into base station Tx beam and terminal Rx beam pairs are arranged in order of performance. For example, in the example of Table 22, the channel performance (RSRP) of the second base station Tx beam and the first terminal Rx beam is the best, and the channel performance (RSRP) of the fourth base station Tx beam and the fourth terminal Rx beam is It means that the next thing is good.

After completion of the ordering according to the received signal strength of the beam pairs, the UE can gently allocate the indicators to the same indicator by simultaneously receiving beam pairs.

[Table 23a] An example of a method of allocating indicators by combining the beams that can be simultaneously received by the current terminal in order of performance

[Table 23a]

In an example of Table 23a, the UE allocates groups in the same order of their Rx beam IDs, Terminal beam pairs and assign them to the same indicator.

In the example of Table 23a, the terminal is the best base station? The indicator of the group to which the terminal beam pair belongs is assigned as 0, and the next good indicator of the terminal-terminal beam is not included in the indicator 0, and a new group indicator is assigned as 1. In the case of the third base station-terminal beam pair, the same rx beam as the second base station-terminal beam pair can be received at the same time, and the same group indicator 1 as the second base-station beam pair is allocated . With such a rule, it is needless to say that the UE can sequentially group the information of the base station UE beam pairs to be transmitted (transmitted) to the network.

In this case, it is appropriate to remove the terminal rx beam id column from the information that the terminal actually feeds back to the base station. It goes without saying that a method of including the terminal rx beam id and transmitting the terminal rx beam id may also be considered.

[Table 23b] An example of a method in which indicators are allocated by bundling beams that can be simultaneously received by a terminal in order of a terminal receive beam

[Table 23b]

In an example of Table 23b, a UE allocates a group in the same order as its Rx beam ID, Terminal beam pairs and assign them to the same indicator.

In the example of [Table 23b], the terminal allocates the indicator of each beam pair group using its Rx beam ID. For example, in the case of a base station-terminal beam pair having a terminal Rx beam ID of 4, the indicator is allocated as 4 in FIG. The disadvantage of this method is that, regardless of the amount of beam information transmitted by the UE, the number of bits for indicator transmission must be guaranteed by the number of rx beams of the UE. For example, if a terminal has 12 rx beams and only 4 beam measurement information is sent, the number of bits in the signal for the indicator should be 4 bits so that the number of bits in the signal can be maximum 12.

In this case, it is appropriate to remove the terminal rx beam id column from the information that the terminal actually feeds back to the base station. It goes without saying that a method of including the terminal rx beam id and transmitting the terminal rx beam id may also be considered.

[Table 23c] An example of a method of constructing feedback transmission by grouping the beams that can be simultaneously received by the terminal into groups of the same number

[Table 23c]

In the example of Table 23c, the UE allocates the beam indicators of the same Rx beam ID to the UEs in the same order as that of Table 23a in the order of performance, and then the same number of beam pairs .

In the example of [Table 23a], the group indicator of the terminal is allocated in the order of performance, but the example of [Table 23c] is the same as that of [Table 23a] And the number of beam pairs fed back to the base station belongs to the same group and is rearranged to the same two.

If the same number of beam information is included in each group, the network may transmit the number of beam pairs to be transmitted to each terminal by including the number of beam pairs to be transmitted by each terminal in the downlink signal.

For example, as shown in Table 23c, a BS desiring to receive two beam-pair information for each group can transmit the number of beam pairs per group to the MS using one of the following methods.

Example Aa) RRM can be transmitted including the number of beam pairs to be reported in the measurement report configuration signal, the number of beam pairs to be reported per group, and the number of groups to report. In this case, the UE transmits the group and the number of beam pairs to be reported per group in the RRM measurement report transmitted by the uplink according to the condition. For example, if the total number of beam pairs to be reported is K, the number of beam pairs to be reported per group is L, and the number of groups to be reported is M, the UE can report in the following manner

If K> L x M, then the terminal provides a total of L x M beam-pairs information to the network for L groups of M groups.

If K < L x M, then the terminal arranges the beam pairs in order of performance of each beam pair, and each group includes at most L beams within a limit of not exceeding M number of beam groups, Provide the information to the network by constructing a report signal so that the number of pairs is K.

In the case of L = 0, M = 0 or L = ∞ and M = ∞, the UE does not care about the number of beams per beam group, (K), and provide information to the network.

The beam measurement information provided by the terminal may include information on a base station transmission beam id, a terminal reception beam id, a beam measurement quantity (RSRP, RSRQ, SNR, SINR, CQI, Of course.

Embodiment Ab) The number of beam pairs to be reported, the number of beam pairs to be reported per group, and the number of groups to be reported in the downlink physical layer control signal (DCI on PDCCH) or the MAC-CE signal may be transmitted. In this case, the UE includes the number of beam pairs to be reported per group and group in the uplink control signal (UCI on PUCCH), the uplink data signal (Data on PUSCH), or the uplink MAC- send. For example, if the total number of beam pairs to be reported is K, the number of beam pairs to be reported per group is L, and the number of groups to be reported is M, the UE can report in the following manner

If K> L x M, then the terminal provides a total of L x M beam-pairs information to the network for L groups of M groups.

If K < L x M, then the terminal arranges the beam pairs in order of performance of each beam pair, and each group includes at most L beams within a limit of not exceeding M number of beam groups, Provide the information to the network by constructing a report signal so that the number of pairs is K.

In the case of L = 0, M = 0 or L = ∞ and M = ∞, the UE does not care about the number of beams per beam group, (K), and provide information to the network.

The beam measurement information provided by the terminal may include information on a base station transmission beam id, a terminal reception beam id, a beam measurement quantity (RSRP, RSRQ, SNR, SINR, CQI, Of course.

On the other hand, it is proper to remove the terminal rx beam id column and transmit the terminal rx beam id to the information that the terminal actually feeds back to the base station. It goes without saying that a method of including the terminal rx beam id and transmitting the terminal rx beam id may also be considered.

<How to add an indicator to request beam transmission of Beam Change information of a terminal that can simultaneously use multiple Rx beams>

The terminal has a beam pair channel / link measurement value for the transmission beam of each base station and the reception beam pair of the terminal through the information measured and measured as described above.

Based on the channel measurement values, the UE can feedback the measurement values and the base station beam ID information of the top few or the best base station beams by adding an indicator.

In the method of providing the beam feedback information with the indicator added to the base station, when the terminal can simultaneously operate two or more different reception beams, the indicator and the beam feedback information may be configured in the following manner.

A.  When the terminal needs to change to a reception beam other than two or more reception beams currently used for wireless communication, the indicator is ON (= 1, true) to transmit beam feedback

An indicator of the transmission beam of a base station that can be received using the beam being used by the terminal is indicated by 0 and transmitted. For other beams, the indicator is set to 1 and transmitted.

[Table 24] This is an example in which, if the UE rx beam IDs currently being used by the UE are 1 and 2, an indicator is included in the beam-pair measurement information feedback of the K UEs.

[Table 24]

When the UE Rx beam ID is removed from the information, the beam feedback information is completed as follows.

[Table 25] The case where UE rx beam IDs currently being used by UEs are 1 and 2, this is an example including the indicator in the completed beam feedback.

[Table 25]

In order to change from the base station beam currently being used as the (on, 1) base station beam whose indicator is on, the base station must transmit the beam change request message (BCI) to the terminal and change the beam .

In this case, the corresponding indicator is an indicator indicating that communication is possible when the corresponding indicator is turned on in the case of the beam with the terminal being different from the terminal beam being used by the terminal.

At this time, when the indicator is turned off (off, 0) from the base station beam currently being used as the base station beam, the base station can arbitrarily change the terminal without providing special information to the terminal in advance. If the base station arbitrarily changes the beam without such a special procedure, it is possible to efficiently and quickly change the beam by reducing time wasted such as promising and waiting for BCI transmission and beam change to the terminal.

In addition, it is needless to say that the indicator may indicate the base station beams simultaneously received by the terminal. In this case, it is to be understood that the UE may indicate that it can simultaneously receive the base station beams indicated by the corresponding rx beams (or rx beams). In this case, it is needless to say that the base station can perform transmission to the mobile station by utilizing two or more base station beams simultaneously indicated by the indicator.

On the other hand, it is proper to remove the terminal rx beam id column and transmit the terminal rx beam id to the information that the terminal actually feeds back to the base station. It goes without saying that a method of including the terminal rx beam id and transmitting the terminal rx beam id may also be considered.

&Lt; Method of Using Beam Change / Beam Simultaneously Using Indicator of Base Station >

The base station (eNB, gNB, TRP, etc.) can select and change a beam to be used for communication with the terminal through the information received as described above. At this time, if the indicator is intended to use a beam indicated to require the transmission of a beam change request message (BCI) for beam change, after the beam change request message is transmitted and the beam change procedure is performed, shall.

On the other hand, if the indicator indicates that the UE is capable of receiving using the same rx beam, and the transmission of the beam change request message (BCI) for beam change is to use an unnecessary beam, the transmission of the beam change request message and the beam It goes without saying that the beam can be used freely without any modification procedure.

In addition, it is needless to say that the indicator may indicate the base station beams simultaneously received by the terminal. In this case, it is to be understood that the UE may indicate that it can simultaneously receive the base station beams indicated by the corresponding rx beams (or rx beams). In this case, it is needless to say that the base station can perform transmission to the mobile station by utilizing two or more base station beams simultaneously indicated by the indicator.

<How to use it as an indicator to indicate when simultaneous reception is impossible>

It should be noted that the indicator may indicate the base station beams that the terminal can not simultaneously receive. In this case, it is needless to say that the terminal may indicate that the base stations beams indicated by the corresponding indicator using the same rx beam (or rx beams) can not be simultaneously received. In this case, it is needless to say that the base station may perform transmission to the mobile station by utilizing two or more base station beams included in different indicator groups at the same time.

Or, if the UE can use multiple Rx beams simultaneously, it is necessary to use the same rx beam as the base station beams that can not be used simultaneously with the base station to obtain diversity gain using these different rx beams, or to maximize the diversity gain It is also possible to grouping and indicating in the direction that it can be done.

For example, referring to Table 23a, the UE indicates to the network by grouping the transmission beams of the network that can be received using the same rx beam. In this case, if the UE is capable of receiving and using different rx beams simultaneously, beams that can be simultaneously transmitted using this information should be selected from base station beams belonging to different group indications rather than the same group indication, It is possible to simultaneously receive these base station beams using another rx beam.

<First Beam Feedback Transmission Scheme according to Beam Selection in Initial Connection>

FIG. 2J is a view for explaining the operation of the base station and the terminal for the first beam feedback transmission method in accordance with the selection of the used beam at the initial connection.

Referring to FIG. 2J, in order for the UE to select the indicator to be included in the beam feedback, it is necessary to recognize the currently used rx beam. To do this, we propose a method to select the first rx beam when the terminal first connects to the network, and select the indicator in beam feedback to be transmitted based on this.

A. If the terminal and the base station specify a usable beam using a method other than beam feedback,

A.1. When the terminal selects the beam pair with the highest success rate through the pre-beam measurement result and performs random access using the corresponding beam pair and succeeds

A.2. When the UE performs random access in any way and successfully receives a RAR from a base station using a specific beam

A.3. If the UE has successfully received a UE specific message from the base station in any manner

B. When the terminal and the base station specify the usable beam using the beam feedback,

B.1. The terminal sends all indicators in the beam feedback to indicate that the beam change messaging is required (eg, 1) before the beam is specified.

&Lt; Base Station Beam Change Indication &lt; RTI ID = 0.0 &gt;

In the case where the mobile station constructs a group of beam information to the base station and transmits the beam information to the base station, the base station can select the following methods when transmitting the beam change indication for use of the new beam to the corresponding mobile station in the downlink.

A. How to transfer the beam ID to be changed and the beam group ID to which the beam to be changed belongs together

● The network can transmit beam ID and beam group ID to be changed to the terminal. For example, if the beam group ID is an ID indicating a bundle of beams that can be simultaneously received by the terminal, if the base station transmits the beam group ID, the terminal knows the beam group ID, It is possible to know whether or not to receive the transmission. In a multi-antenna transmission / reception structure in which one base station beam can be received by two or more terminal beams, if the same base station beam may belong to two or more different terminal beam groups, There is an advantage that a clear message that the mobile station can receive using a certain beam group is provided to simplify the operation of the mobile station. On the other hand, the base station has an overhead to perform additional operations to identify and select such terminal groups. It is needless to say that considering the terminal operating with the battery, the network performs this operation and does not perform the terminal, thereby increasing the battery usage time of the terminal.

● The network may transmit only the beam group ID without transmitting the beam ID to be changed to the terminal. For example, if the beam group ID is an ID indicating a bundle of beams that can be simultaneously received by the terminal, if the base station transmits the beam group ID, the terminal knows the beam group ID, It is possible to know whether or not to receive the transmission. It is needless to say that the terminal needs only to receive information successfully from the base station and to transmit its own information, so that information can be selected so that only the terminal beam can be properly selected. This method has an advantage of simplifying the operation of the terminal by giving a clear message to the terminal that a beam group can be received. In addition, there is an advantage that the base station can use or change the beam in the group whenever desired.

After receiving the beam group ID, the terminal performs communication using the terminal Rx beam (or Rx beams) capable of receiving the base station information transmitted in the corresponding beam group ID. This operation may be the same as the beam changing operation of FIG. 2E, and it is also possible to transmit the signal including the beam group ID instead of the beam ID in the downlink information to be transmitted for beam change only.

[Example C]

The UE may measure the degradation of the beam or beams in use and trigger a beam recovery procedure to recover the beam or beams using another beam. The procedure for determining the performance degradation of the beam in use at this time is referred to as Beam Failure Detection procedure, and the condition for triggering the beam recovery procedure including the beam failure detection procedure is as follows.

Beam Failure Detection Method

Where the beam can be any beam (base station beam, terminal beam, or pair of base station beam and terminal beam) that the terminal and base station are using, or any beam group that the terminal and base station have explicitly (or implicitly) or a set of beams.

In this case, the beam may be a physical antenna setting and may be a measurement unit of a terminal (for example, SS block, SS burst, SS burst set, CSI-RS block, CSI-RS burst, CSI-RS burst set).

0. Resource / RS Configuration

- beam recovery transmission resource allocation (i.e., RACH time / frequency / sequence, or any dedicated / common resource)

- beam (or beam) information (beam ID, RS position, frequency, time, etc.)

  : The beams may be the beams set through the second embodiment.

- Threshold, offset, etc. required for the terminal to perform Condition 1/2

1. L1 detection

- If the beam (s) measured by the physical layer satisfy Condition 1,

- The physical layer sends a corresponding indication to the upper layer for later operation

- The upper layer starts beam recovery procedure after receiving indication

2. L2 detection with L1 indication

- If the beam (s) measured by the physical layer satisfy Condition 1, transmit the indication to the upper layer

- The L2 layer receives one or more indications from the physical layer and, if the reception of the indications satisfies Condition 2, detects beam failure and / or Beam recovery triggering

- L2 layer starts beam recovery procedure

3. L3 detection with L1 indication

- If the beam (s) measured by the physical layer satisfy Condition 1, transmit the indication to the upper layer

- The L3 layer receives one or more indications from the physical layer and, if the reception of the indications satisfies Condition 2, the beam failure and / or beam recovery triggering judgment

- L3 layer starts beam recovery procedure

4. L2 detection with L1 indication

- If the beam (s) measured by the physical layer satisfy Condition 1, transmit the indication to the upper layer

- If the UE receives one or more indications from the physical layer and the reception of the indications satisfies Condition 2, the UE attempts to transmit UL beam feedback (L1 feedback and / or L2 feedback) using pre-

- The L2 layer can determine the beam failure and / or beam recovery triggering if Condition 3 is satisfied.

- L2 layer starts beam recovery procedure

5. L3 detection with L1 indication

- If the beam (s) measured by the physical layer satisfy Condition 1, transmit the indication to the upper layer

- If the UE receives one or more indications from the physical layer and the reception of the indications satisfies Condition 2, the UE attempts UL beam feedback and / or L2 feedback and / or L3 reporting)

- L3 layer satisfies any Condition 3, and if beam failure and / or Beam recovery triggering judgment

- L3 layer starts beam recovery procedure

The Condition 1 may be as follows:

- Base station control channel with measurable terminal beam (s) Measure <Threshold1

- Estimated DL signal reception error probability> N1%

- Beam (s) Measure <Threshold1 (AND) Any One Beam Measure> Threshold 2

- Any set 1 of beams measured < RTI ID = 0.0 &gt; &lt; Threshold1 &lt; / RTI &

- Any condition created by a combination of the above conditions

The Condition 2 can be as follows:

- Same as condition1

- Consecutive N2 indication receivings (i.e., L1 OOS)

- Reception of N3 or more indications within a predetermined time (timer2) (i.e., L1 OOS)

- Any one beam measurement> Threshold 2

- The measured value of any beam in any set 2 of beams that was previously promised (or configured from the base station) to the base station> Threshold2

- When any timer 1 triggered immediately after the condition 1 is satisfied is expired

: The timer1 may be a value set in the terminal implementation

: If IS is not received from L1 in the timer1

: If UL signal transmission is not successful in the timer 1

: If the condition1 condition is continuously maintained in the timer1

: The timer 1 may be a value configured by the base station

: The timer1 may be canceled if it receives any indication (ie, In-sync-indicator) from the lower layer.

: The timer 1 may be canceled when receiving an indication (i.e., RLF triggering indication, RLF declaration indication) from the upper layer.

- Any condition created by a combination of the above conditions

The Condition 3 may be as follows:

- Consecutive N4 indication receivings (i.e., L1 OOS)

- Reception of N5 or more indications within a predetermined time (timer2) (i.e., L1 OOS)

- Any one beam measurement> Threshold3

- The measured value of any beam in any set 2 of beams previously promised to the base station (or configured from the base station)> Threshold3

- When any timer 2 triggered immediately after the condition 2 is satisfied is expired

: The timer2 may be a value set in the terminal implementation

: The timer2 may be a value configured by the base station

: If IS is not received from L1 in the timer2

: If UL signal transmission is not successful in the timer 2

: If condition1 and / or conditon2 conditions are maintained in timer2

: The timer2 may be a value configured by the base station

: The timer 2 may be a timer indicating a position of the uplink transmittable resource (PRACH, SR resource, etc.) to arrive within the nearest time after the time of the threshold 4 or more,

: The timer 2 may be canceled if it receives any indication (eg, In-sync-indicator) from the lower layer.

: The timer 2 may be canceled when receiving an indication (i.e., RLF triggering indication, RLF declaration indication) from the upper layer.

- Any condition created by a combination of the above conditions

Beam Recovery Request signal transmission method - Embodiments

The terminal may perform a beam recovery operation when the beam failure condition is satisfied. Specifically, the MS may transmit an uplink beam recovery request signal for beam recovery. To do this, the terminal can perform the following operations.

One. Trigger UL beam recovery request signal immediately if the beam failure condition2 is met

FIG. 2K shows a method of attempting to transmit a beam recovery request when a condition 2 condition is satisfied, in association with an RLF operation.

Referring to FIG. 2K, if the condition (Condition 2) is satisfied, the UE immediately triggers transmission of an uplink beam recovery request signal to arrive within the nearest time. At this time, if there is a large difference between the resource for performing the uplink transmission and the triggered point of time, it waits for a predetermined time and continues to determine whether the triggering condition is satisfied or not.

Also, between the trigger point and the actual transmission point, the UE continuously transmits the UL signal using the uplink resource allocated in advance. In this case, it is needless to say that the uplink transmission (beam resumption) may be attempted to increase the success rate even if the measured value of the resource is less than a certain threshold value (condition 1).

If the triggering condition (Condition 1) is canceled (if it is no longer satisfied), the UE can cancel all the procedures in progress even though the triggered uplink beam recovery request signal (BRR) transmission time has not arrived yet . For example, if the received signal strength of a certain beam is below a predetermined threshold so that transmission of the corresponding uplink BRR signal is triggered, if it is again observed that the received signal strength of the corresponding beam is equal to or higher than the threshold before arriving at the transmitting time, The transmission of the uplink BRR signal can be canceled.

2. Trigger UL beam recovery request signal after condition 3 is met after the beam failure condition is met

FIG. 2L illustrates how a UE attempts to transmit a beam recovery request when a condition2 condition is satisfied, in association with an RLF operation. FIG. 21 is an example of performing an operation of waiting for a time until the PRACH arrives at the end of a fixed timer.

Referring to FIG. 2L, if the condition (condition 2) is satisfied, the UE sets a condition 3 (e.g., a timer) and waits for the condition to be satisfied, and transmits the UL signal using the continuously allocated uplink resource. At this time, it is needless to say that the uplink transmission may be attempted to increase the success rate even if the measured value of the resource is less than a certain threshold value (condition 1).

If the Condition 3 is satisfied, the MS immediately triggers transmission of the uplink beam recovery request signal to arrive within the nearest time.

At this time, if there is a difference between the time at which the condition 3 is satisfied and the resource to be transmitted the UL beam recovery request, there is an operation to be performed when the condition 2 is satisfied (beam resumption: Link feedback) and judge whether the condition1 is not solved. .

If Condition 3 is not satisfied and the corresponding triggering condition (Condition 1) is canceled (if it is no longer satisfied), the UE can cancel all the procedures in progress. For example, if the received signal strength of a certain beam is below a predetermined threshold so that transmission of the corresponding uplink BRR signal is triggered, if it is again observed that the received signal strength of the corresponding beam is equal to or higher than the threshold before arriving at the transmitting time, The transmission of the uplink BRR signal can be canceled.

It is needless to say that if the triggering condition (Condition1) is canceled (if it is no longer satisfied), the UE can cancel all the procedures in progress, even though the resource time to perform UL beam recovery request transmission has not come yet. For example, if the received signal strength of a certain beam is below a predetermined threshold so that transmission of the corresponding uplink BRR signal is triggered, if it is again observed that the received signal strength of the corresponding beam is equal to or higher than the threshold before arriving at the transmitting time, The transmission of the uplink BRR signal can be canceled.

FIG. 2m shows a method of attempting to transmit a beam recovery request when a condition 2 condition is satisfied, in association with an RLF operation.

Referring to FIG. 2M, the UE performs a Beam resumption operation (i.e., pre-allocated resource utilization uplink feedback) until a Condition 3 is satisfied (i.e., a fixed timer expiration) until the BRT is declared according to Condition 1 or Condition 2 (I.e., Timer expire) when Condition 3 is satisfied (i.e., pre-allocated resource utilization uplink feedback) while attempting beam recovery using the PRACH. At this time, PRACH beam recovery may be continuously performed when the condition 1 is satisfied, or may be attempted only for a corresponding timer with a certain timer_br, or until a failure of consecutive (or discontinuous) N_max_br is attempted Of course it is.

FIG. 2n shows how a UE attempts to transmit a beam recovery request when a condition2 condition is satisfied, in association with an RLF operation.

Referring to FIG. 2n, the UE displays BRT by Condition 1 or Condition 2, and performs a beam resumption operation (i.e., pre-allocated resource use uplink feedback) while attempting beam recovery using the PRACH. At this time, PRACH beam recovery may be continuously performed when the condition 1 is satisfied, or may be attempted only for a corresponding timer with a certain timer_br, or until a failure of consecutive (or discontinuous) N_max_br is attempted Of course it is.

FIG. 20 shows a method of attempting to transmit a beam recovery request when a condition 2 condition is satisfied, in association with an RLF operation.

Referring to FIG. 20, the UE may perform the beam resumption operation continuously until the arrival of the PRACH even if the fixed timer is ended

FIG. 2P shows how a UE attempts to transmit a beam recovery request when condition 2 is satisfied, in association with an RLF operation.

Referring to FIG. 2P, when the T310 timer for RLF is triggered, the MS may trigger a beam recovery request at the same time. For this purpose, the UE may transmit a beam recovery request trigger message from the RRC layer to the MAC / PHY layer or from the MAC layer to the PHY layer.

Conversely, if the beam problem is detected by the above condition1 or condition2, the terminal may transmit the detected T310 timer to the upper layer to trigger the T310 timer. For this purpose, the UE may transmit a T310 trigger message from the PHY layer to the MAC / RRC layer or from the MAC layer to the RRC layer.

Control channels used to declare the beam failure and reference signals (RS) for measurement of each channel may be pre-scheduled RSs and channels of the base station.

The candidates for the corresponding beam failure detection RSs are:

- UE-specific resource scheduled CSI-RS with dedicated signal configured

 -> CSI-RS with resources / characteristics assigned for that terminal only

- Cell-specific resource scheduled CSI-RS with dedicated signal configured

 -> CSI-RS with allocated resources / characteristics for unspecified multiple terminals

- NR-Sync Signal (PSS, SSS, PBCH)

 -> Synchronous signals and broadcast channel signals with allocated resources / characteristics for unspecified multiple terminals

The beams (such as a new candidate beam or an RACH performed beam) used for performing the beam recovery may be pre-scheduled RSs of the base station or RSs capable of self-measurement by the terminal.

The candidates for the corresponding beam recovery identification RS are:

- UE-specific resource scheduled CSI-RS with dedicated signal configured

 -> CSI-RS with resources / characteristics assigned for that terminal only

- Cell-specific resource scheduled CSI-RS with dedicated signal configured

 -> CSI-RS with allocated resources / characteristics for unspecified multiple terminals

- NR-Sync Signal (PSS, SSS, PBCH)

 -> Synchronous signals and broadcast channel signals with allocated resources / characteristics for unspecified multiple terminals

The reference signals RS used for performing the cell level problem detection may be RSs that have been scheduled in advance by the base station or can be self-measured by the user equipment.

Beam Recovery failure RLF  Declaration Method - Examples

The terminal can declare the RLF when the beam recovery operations performed continuously fail. More specifically, the UE can declare an RLF in the following cases.

- RLF declaration (NACK count or failure indication count) when N_RLF1 consecutive beam recovery fails

- Declare RLF if Timer_RLF1 fails

- RLF declaration when N_RLF2 times failed in Timer_RLF2 (regardless of whether it is discontinuous)

- RLF Declaration Request from Network (or Node-B) for Recovery Attempt RLF Declaration Upon Receiving DL Signal

- After Beam failure declaration (by Condition1 or Condition2 above) Timer_RLF3 or above If beam recovery can not be attempted at all (Condition3 dissatisfied) RLF declaration

The apparatus configuration of the terminal described with reference to FIG. 1Y and the apparatus configuration of the base station described with reference to FIG. 1Z are also applicable to the embodiments B and C of the present invention.

The transmission / reception unit 5010 of the terminal 5000 can transmit and receive signals. The transmission / reception unit 5010 can transmit and receive signals under the control of the control unit 5030. [ The control unit 5030 of the terminal 5000 can control the overall operation of the terminal described in Embodiment B and Embodiment C. [ The control unit 5030 can control the terminal to perform the operations described with reference to FIGS. 2A to 2P.

The transmission / reception unit 5110 of the base station 5100 can transmit and receive signals. The transmission / reception unit 5110 can transmit and receive signals under the control of the control unit 5130. The controller 5130 of the base station 5100 can control the overall operation of the terminal described in the second and third embodiments. The controller 5130 may control the base station to perform the operations described with reference to FIGS. 2A through 2P.

The embodiments disclosed in the present specification and drawings are merely illustrative of specific examples for the purpose of easy explanation and understanding of the present invention and are not intended to limit the scope of the present invention. Accordingly, the scope of the present invention should be construed as being included in the scope of the present invention, all changes or modifications derived from the technical idea of the present invention.

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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