KR20190095341A - Method, apparatus, and system for distinguishing terminals in power saving mode and paging signal transmission for waking terminal operating in power saving mode - Google Patents

Abstract

The present disclosure relates to a communication technique and a system for fusing a 5G communication system with IoT technology for supporting a higher data rate after a 4G system. The present disclosure is based on 5G communication technology and IoT-related technologies, such as intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety related services, etc.) ) Can be applied.
The present invention is a method for operating a power saving mode of a terminal for a system including one or more base stations and one or more terminals, and a method of distinguishing a terminal of a base station for transmitting paging to the terminal.

Description

Method, apparatus, and system for distinguishing terminals in power saving mode and paging signal transmission for waking terminal operating in power saving mode

The present invention relates to a next-generation wireless communication system, and in particular, distinguishes between a power saving mode operation procedure of a terminal for a system including at least one base station and at least one terminal, and a terminal of a base station for transmitting paging to the terminal. The present invention relates to a method, a terminal recognition method, and a method, procedure, and system for transmitting paging information by multiple base stations in a certain area to individual terminals.

In order to meet the increasing demand for wireless data traffic since the commercialization of 4G communication systems, efforts are being made to develop improved 5G communication systems or pre-5G communication systems. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE). In order to achieve high data rates, 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the propagation distance of radio waves, beamforming, massive array multiple input / output (FD-MIMO), and FD-MIMO are used in 5G communication systems. Array antenna, analog beam-forming, and large scale antenna techniques are discussed. In addition, in order to improve the network of the system, 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation The development of such technology is being done. In addition, in 5G systems, Hybrid FSK and QAM Modulation (FQAM) and Slide Window Superposition Coding (SWSC), Advanced Coding Modulation (ACM), and FBMC (Filter Bank Multi Carrier) and NOMA are advanced access technologies. (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans create and consume information, and an Internet of Things (IoT) network that exchanges and processes information between distributed components such as things. The Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers and the like, is emerging. In order to implement the IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between things, a machine to machine , M2M), Machine Type Communication (MTC), etc. are being studied. In an IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.

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), machine type communication (MTC), and the like, are implemented by techniques such as beamforming, MIMO, and array antennas. It is. Application of cloud radio access network (cloud RAN) as the big data processing technology described above may be an example of 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 enhanced mobile broad band (eMBB), ultra-reliable and low latency communication (URLLC), and massive device-to-device communication (mMTC). machine type communication), a next-generation broadcast service (eMBMS: evolved multimedia broadcast / multicast service), and the like. The system providing the URLLC service may be referred to as a URLLC system, the system providing the eMBB service, the eMBB system, and the system providing the mMTC service. In addition, the terms service and system may be used interchangeably.

This disclosure is intended to address at least the above mentioned problems and / or disadvantages and to provide at least the advantages described below.

Accordingly, the present invention provides a method for operating a power saving mode of a terminal for a system including one or more base stations and one or more terminals, a method of identifying a terminal of a base station for transmitting paging to the terminal, a terminal recognition method, and It is an object of the present invention to provide a method, procedure, and system for transmitting paging information by a plurality of base stations in a certain area to individual terminals.

According to an embodiment of the present invention, in a method of operating a base station in a wireless communication system, receiving beam measurement information from a terminal, determining a transmission beam change of the base station for the terminal based on the beam measurement information And changing the transmission beam of the base station based on the relationship between the current reception beam of the terminal and the new transmission beam of the base station included in the beam measurement information.

In addition, according to an embodiment of the present invention, the base station receives beam measurement information from a transceiver and a terminal for transmitting and receiving a signal, and determines the transmission beam change of the base station for the terminal based on the beam measurement information And a control unit for controlling to change the transmission beam of the base station based on the relationship between the current reception beam of the terminal and the new transmission beam of the base station included in the beam measurement information.

Further, according to an embodiment of the present invention, in a method of operating a terminal in a wireless communication system, performing beam measurement on at least one transmission beam of the base station and at least one beam of the terminal, based on the beam measurement And transmitting beam measurement information to the base station and receiving downlink information transmitted from a new transmission beam of the base station, wherein the new transmission beam of the base station is included in the beam measurement information of the terminal. The method may be changed based on a relationship between a current reception beam and a new transmission beam of the base station.

In addition, according to an embodiment of the present invention, in the terminal, at least one transmission beam of the transceiver and the base station for transmitting and receiving signals and beam measurement for at least one beam of the terminal, and based on the beam measurement And a control unit which transmits beam measurement information to the base station and controls to receive downlink information transmitted from a new transmission beam of the base station, wherein the new transmission beam of the base station is included in the beam measurement information. It is possible to provide a terminal that is changed based on the relationship between the current reception beam of and the new transmission beam of the base station.

It is an object of the present invention to provide a system, method, and apparatus for performing beam tracking and beam feedback operations in a beamforming based system.

It is still another object of the present invention to provide a system, method, and apparatus for performing beam tracking and beam feedback operations in a beamforming based system.

Another object of the present invention is to provide a beam feedback and beam management method in a wireless system in which a base station and a terminal using multiple antennas exist.

Another object of the present invention is to provide a beam feedback and tracking method in which a terminal informs a base station of beam measurement information through an indicator in a system and an environment using multi-antenna-based beamforming.

Another object of the present invention is to provide a beam feedback and beam management method in a wireless system in which a base station and a terminal using multiple antennas exist.

Another aspect of the present invention provides a system including at least one base station and at least one terminal, wherein the terminal operates in a power saving state, and the base station identifies and recognizes an individual terminal and transmits a paging signal thereto. will be.

The above and other aspects, features and advantages of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.
1A illustrates one embodiment of a RAN Paging procedure.
1B illustrates an example of a paging receiving method operation procedure of a power saving state operation terminal.
1C illustrates a new RNTI usage method for RAN paging.
1D shows various methods of constructing RP-TMSI (or new TMSI).
FIG. 1E illustrates RAN and CN Paging procedures and respective UE operations when RP-TMSI is added.
1F illustrates an embodiment using both RP-RNTI and RP-TMSI.
1G shows an example in which the last serving base station simplifies paging using C-RNTI.
FIG. 1H shows an example in which the last serving base station includes a C-RNTI in a paging message and transmits it.
FIG. 1I illustrates an example of an environment in which CN Paging and RAN Paging coexist with different periods and Pagin Occasion.
1J shows an example of an environment in which CN Paging and RAN Paging coexist with the same period and Pagin Occasion.
1K illustrates one embodiment of a Minimum / Additional SI modification Period operation.
1L illustrates one embodiment of SIU Update operation.
1M illustrates an embodiment of uplink transmission resource allocation in a paging PDCCH for fast re-connection.
1n illustrates another embodiment of uplink transmission resource allocation in a paging PDCCH for fast re-connection.
FIG. 1O illustrates another embodiment of uplink transmission resource allocation in a paging PDCCH for fast re-connection.
Figure 1p is a Paging PCH Config including UL-SCH. A fast network reconnection method is shown.
1Q illustrates an embodiment of uplink transmission resource allocation and indicator addition in a paging PDCCH for fast re-connection
1r illustrates another embodiment of uplink transmission resource allocation and indicator addition in a paging PDCCH for fast re-connection.
FIG. 1S illustrates another embodiment of uplink transmission resource allocation and indicator addition in a paging PDCCH for fast re-connection.
Figure 1t is a Paging PCH Config including UL-SCH and Indicator. A fast network reconnection method is shown.
1U is a diagram illustrating an example of a RNTI + Preamble transmission method.
1V illustrates a Paging PCH Config including Dedicated RACH Preamble. 4 is a diagram illustrating a fast network reconnection method.
1W is a diagram illustrating an example of a paging message + preamble transmission method.
1x illustrates 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 according to an embodiment of the present invention.
2B 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.
2C is a diagram illustrating a frame structure for feeding back multiple beam IDs and beam measurement values according to an embodiment of the present invention.
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.
2E is a diagram illustrating an example of beam change through beam feedback.
2F and 2G illustrate frame structures for transmitting beam feedback.
FIG. 2H is a diagram illustrating operations of a base station and a terminal for changing from a base station beam currently being used as a (on, 1) base station beam with corresponding indicator turned on.
FIG. 2I illustrates an operation of the base station and the terminal when the indicator is an indicator indicating that the base station can freely change the base station without sending a BCI.
2J is a diagram illustrating operations of a base station and a terminal for a first beam feedback transmission method according to beam selection for initial access.
2K is a diagram illustrating a method in which a terminal attempts to transmit a beam recovery request when a condition2 condition is satisfied according to an embodiment of the present invention in association with an RLF operation.

Embodiments of the present invention are described in detail with reference to the accompanying drawings, wherein like reference numerals may be used to refer to like elements. It is to be understood, however, that there is no intention to limit the specification to the specific forms disclosed herein. Rather, the present disclosure should be construed to cover various modifications, equivalents, and / or alternatives to embodiments of the present disclosure.

In this specification, the term "base station" may be used interchangeably with "eNB". Also, "terminal" can be used interchangeably with "user equipment".

Example A: INACTIVE UE ID

With the advent of smart phones, the usage of smart phones by users is increasing exponentially, and the demand for increasing battery life for the continuous use of smart phones by these users is increasing. This means that an efficient power saving technology is required, which requires a power saving mode operation of the terminal. For efficient terminal power savings, various techniques have been proposed and standardized to allow terminals to operate in a power saving mode more frequently and to reestablish connection with the network more quickly.

Representative technologies for power saving in smartphones are as follows: Power Saving State UE operation in sub-state of RRC Connected State, Power Saving State UE operation in sub-state of RRC IDLE State, new RRC state There are Power Saving State UE operation, LTE Lightly Connected State operation, 5G NR RRC_INACTIVE State operation, WLAN (IEEE 802.11) Power Save Mode operation.

If there is no transmission / reception information for a predetermined time or other conditions are satisfied, the terminal transitions to a power saving state (LC: Lightly Connected State, INACTIVE: RRC_INACTIVE State). At this time, the difference between the IDLE mode and the base station is that the base station and the terminal maintain the network connection information (S1 information) and the terminal information of the terminal, and the terminal still appears to be connected (RRC_Connected) in the view of the Core Network. Is the point. The reason for maintaining the S1 information is to perform a network re-connection very quickly. In this way, the terminal operating in the power saving state wakes up and reconnects to the network if there is information that needs to be transmitted.

In order to perform paging (RAN based paging) of a base station, a bundle of base stations transmitting such paging is defined as a RAN paging area and corresponding information is provided to the terminal. The UE, which knows the RAN paging area information, wakes up periodically during the power saving state operation to determine whether it is in the RAN paging area that it still knows, and if it is in the corresponding RAN paging area, it examines the promised sub-frame and downlink paging information. You should judge if there is any. If the UE leaves the RAN Paging Area while the UE is sleeping, the UE should reestablish the connection to the neighboring BS and perform the RAN Paging Area Update.

1A illustrates an example of a structure of a core network, a base station, and a terminal for such RAN paging transmission according to an embodiment of the present disclosure.

As such, in order to transmit paging information to a terminal operating in a power saving state, a delimiter of a terminal capable of specifying a terminal may be required, and a procedure of transmitting a paging message including the delimiter may be required.

In the case of IDLE mode paging (= CN Paging) transmitted by the MME, the P-RNTI is used to specify a sub-frame in which paging exists.

If there is a terminal to receive any paging, the P-RNTI value is included in the physical downlink control channel (PDCCH) of the sub-frame that the terminal periodically wakes up and receives at a predetermined paging occasion.

1B illustrates an example of a paging receiving method operating procedure of a power saving state operating terminal according to an embodiment of the present disclosure.

Referring to FIG. 1B, in operation 1b-05, the base station may receive a paging message for a specific terminal from the MME.

In operation 1b-10, the base station transmits the P-RNTI to the PDCCH of the subframe that the terminal periodically wakes up and receives at a predetermined paging occasion.

Upon receiving the P-RNTI in operation 1b-15, the UE determines that the corresponding subframe includes a paging message transmitted to any UE.

In operation 1b-20, the base station transmits a paging message through a physical downlink shared channel (PDSCH) of the same subframe or a PDSCH of a subframe indicated by the PDCCH. The paging message may include a system architecture evolution (SAE) -temporary mobile subscriber identity (S-TMSI) or an international mobile subscriber identity (IMSI) that is a unique ID in the MME of the terminal.

In operation 1b-25, the UE checks whether the corresponding S-TMSI or IMSI is included in the corresponding subframe. If it is included, the operation proceeds to the operation 1b-30. If it is not included, the operation proceeds to the operation 1b-35. In operation 1b-30, the terminal performs an operation for network reconnection. In operation 1b-35, the terminal resumes the sleep operation. The terminal may perform a sleep operation until the next paging occasion.

<How to specify RAN paging subframe by defining new RNTI>

A method for defining a new RNTI different from the P-RNTI (RAN Paging RNTI: RP-RNTI) and enabling the base station to paging the terminal using the same.

The base station may transmit the P-RNTI and / or the RP-RNTI through the PDCCH of the subframe that the terminal periodically wakes up at a predetermined paging occasion. The transmission method may be a method of scrambling a CRC of a transmitting DCI. Terminals receiving PDCCH in one sub-frame can distinguish CN paging and RAN paging through P-RNTI and RP-RNTI, and are terminals corresponding to CN paging and RAN paging, respectively, P-RNTI and RP-RNTI. Can be divided into At this time, only terminals that receive their P-RNTI or RP-RNTI additionally decode the PDSCH, and terminals not applicable can quickly return to the sleep mode.

Table 1 shows new RNTI values, and Table 2 shows new RNTI usage examples.

1C also illustrates a novel RNTI usage method for RAN paging.

Referring to FIG. 1C, a base station, a RAN paging terminal, and an IDLE terminal are included.

In operation 1c-05, the base station may receive a paging message for a specific terminal from the MME or a paging request including a paging message and terminal ID information for the specific terminal from the base station in the RAN paging area.

In operation 1c-10, the base station may transmit the RP-RNTI through the PDCCH of the subframe, which is a paging occasion of the terminal. The base station may transmit the RP-RNTI to the RAN paging terminal and / or the IDLE terminal on the PDCCH of the subframe that is the paging occasion of the terminal.

Upon receiving the RP-RNTI, the IDLE terminal may recognize that the RP-RNTI is different from the P-RNTI in operation 1c-20 and resume the sleep operation. The IDLE terminal may maintain a sleep state until the next paging occasion.

Upon receiving the RP-RNTI, the RAN paging terminal may confirm that the subframe receiving the RP-RNTI includes a paging message transmitted to any terminal in operation 1c-15.

In operation 1c-25, the base station transmits a paging message through a PDSCH of the same subframe as the subframe in which the RP-RNTI is transmitted or a subframe indicated by the PDCCH including the RP-RNTI. The paging message may include S-TMSI or IMSI, which is a unique ID in the MME of the terminal. Operation 1c-25 may be performed simultaneously with operation 1c-10. That is, information corresponding to 1c-10 may be transmitted in the PDCCH of the same subframe, and information corresponding to operation 1c-25 may be transmitted in the PDSCH. The same may be applied to other embodiments of the present invention.

In operation 1c-30, the RAN paging terminal checks whether its S-TMSI or IMSI is included in the paging message. If the paging message includes the S-TMSI or IMSI corresponding to the RAN paging terminal itself, the operation proceeds to 1c-40. If the paging message does not include the S-TMSI or IMSI corresponding to the RAN paging terminal itself, the procedure 1c- 45 Proceed to operation.

In operation 1c-40, the RAN paging terminal recognizes that the paging message is for itself and performs network reconnection. In operation 1c-45, the RAN paging terminal recognizes that the paging message is not about itself and resumes the sleep operation. The RAN paging terminal may maintain a sleep state until the next paging occasion.

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

A method of defining a new UE Specific ID different from S-TMSI and IMSI (RAN Paging TMSI: RP-TMSI), and using this to enable a base station to paging UE.

A terminal receiving a paging message through a PDSCH in one sub-frame may recognize that the corresponding paging message specifies itself operating as RAN paging.

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

TABLE 3

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

1D illustrates various methods of configuring RP-TMSI (or new TMSI) in accordance with one embodiment of the present disclosure.

The method of configuring RP-TMSI may be the same as that of FIG. 1D.

FIG. 1E illustrates RAN and CN Paging procedures and respective UE operations when RP-TMSI is added.

The procedure when the system uses the same RNTI (P-RNTI) as the RNTI for CN Paging and RAN Paging, and uses a method of classifying UEs by a UE unique ID thereafter is shown in FIG. 1E.

Referring to FIG. 1E, in operation 1e-05, a base station receives a paging message for a specific terminal from an MME or a paging request including a paging message and terminal ID information for a specific terminal from a base station in a RAN paging area. Can be received.

In operation 1e-10, the base station may transmit the P-RNTI on the PDCCH of the subframe, which is a paging occasion of the terminal. The base station may transmit the P-RNTI to the RAN paging terminal and / or the IDLE terminal on the PDCCH of the subframe that is the paging occasion of the terminal.

Upon receiving the P-RNTI, the RAN paging terminal may confirm that the subframe receiving the P-RNTI includes a paging message transmitted to any terminal in operation 1e-15. Upon receiving the P-RNTI, the IDLE terminal may confirm that the subframe receiving the P-RNTI includes a paging message transmitted to any terminal in operation 1e-15.

In operation 1e-25, the base station transmits a paging message through a PDSCH of the same subframe as the subframe transmitting the P-RNTI or a subframe indicated by the PDCCH including the P-RNTI. The paging message may include RP-TMSI, S-TMSI or IMSI, which is a unique ID in the MME of the UE.

In operation 1e-30, the RAN paging terminal checks whether its RP-TMSI or IMSI is included in the paging message. If the paging message includes RP-TMSI or IMSI corresponding to the RAN paging terminal itself, the operation proceeds to 1e-35. If the paging message does not include the RP-TMSI or IMSI corresponding to the RAN paging terminal itself, 1e- Proceed to operation 40.

In operation 1e-35, the RAN paging terminal recognizes that the paging message is for itself and performs network reconnection. In operation 1e-40, the RAN paging terminal recognizes that the paging message is not about itself and resumes the sleep operation. The RAN paging terminal may maintain a sleep state until the next paging occasion.

In operation 1e-45, the IDLE terminal checks whether its S-TMSI or IMSI is included in the paging message. If the paging message includes the S-TMSI or IMSI corresponding to the IDLE terminal itself, the operation proceeds to 1e-50. If the paging message does not include the S-TMSI or IMSI corresponding to the IDLE terminal itself, the operation 1e-55. Proceed to

In operation 1e-50, the IDLE UE recognizes that the paging message is for itself and performs network reconnection. In operation 1e-55, the IDLE terminal recognizes that the paging message is not about itself and resumes the sleep operation. The IDLE terminal may maintain a sleep state until the next paging occasion.

How to use both the new RNTI and the new UE Specific ID

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

The UE operation procedure in the case of performing RAN Paging using the proposed new RNTI (RP-RNTI) and the new UE Specific ID (RP-TMSI) simultaneously is shown in FIG. 1F.

Referring to FIG. 1F, in operation 1f-05, a base station receives a paging message for a specific terminal from an MME or a paging request including a paging message and terminal ID information for a specific terminal from a base station in a RAN paging area. Can be received.

In operation 1f-10, the base station may transmit the RP-RNTI through the PDCCH of the subframe, which is a paging occasion of the terminal. The base station may transmit the RP-RNTI to the RAN paging terminal and / or the IDLE terminal on the PDCCH of the subframe that is the paging occasion of the terminal.

Upon receiving the RP-RNTI, the IDLE UE may recognize that the RP-RNTI is different from the P-RNTI in operation 1f-20 and resume the sleep operation. The IDLE terminal may maintain a sleep state until the next paging occasion.

Upon receiving the RP-RNTI, the RAN paging terminal may check that the subframe receiving the RP-RNTI includes a paging message transmitted to a certain terminal in operation 1f-15.

In operation 1f-25, the base station transmits a paging message through a PDSCH of the same subframe as the subframe transmitting the RP-RNTI or a subframe indicated by the PDCCH including the RP-RNTI. The paging message may include RP-TMSI or IMSI, which is a unique ID in the MME of the terminal.

In operation 1f-30, the RAN paging terminal checks whether its RP-TMSI or IMSI is included in the paging message. If the paging message includes RP-TMSI or IMSI corresponding to the RAN paging terminal itself, the operation proceeds to 1f-40. If the paging message does not include the RP-TMSI or IMSI corresponding to the RAN paging terminal itself, 1f- 45 Proceed to operation.

In operation 1f-40, the RAN paging terminal recognizes that the paging message is for itself and performs network reconnection. In operation 1f-45, the RAN paging terminal recognizes that the paging message is not about itself and resumes the sleep operation. The RAN paging terminal may maintain a sleep state until the next paging occasion.

<Base stations in the RAN paging area allocate unique terminal IDs in the RAN paging area>

(One). How to set up a single principal and assign it to a principal

(A). Select one base station

(B). MME allocation

(2). How to randomly assign without a principal

(3). How Base Stations Distribute and Assign Unique ID Pools

(4). How Base Stations Assign IDs Distributedly and Announce Each Other

(A). Need conflict resolution

<Method of last serving base station and neighboring base station paging terminal using different RNTI>

In the case of the last serving base station that the terminal accessed last before transitioning to the power saving state, it retains the C-RNTI of the terminal as it is and maintains the S1 connection for information exchange between the terminal and the core network. Using this feature, the last serving base station can be more efficiently paging using a method that is different from other base stations in the RAN paging area of the terminal.

The operation of the base station and the terminal for this is as follows: The terminal operating in the power saving state wakes up periodically to check whether the paging information has been received by the sub-frame at the promised time. To this end, the UE periodically wakes up, resets downlink synchronization before sub-frame reception, and selects a cell to receive the sub-frame (which may be the same as or similar to the cell reselection operation in IDLE mode). Will be chosen.

1G illustrates an example in which the last serving base station simplifies paging using C-RNTI according to an embodiment of the present disclosure.

Referring to FIG. 1G, base stations in other RAN paging areas other than the last serving base station to which the terminal is connected cannot use the C-RNTI of the terminal, so Paging the terminal using P-RNTI, RP-RNTI, etc. The serving base station may paging using the C-RNTI knowing the terminal. At this time, the C-RNTI may be transmitted (by scrambling the CRC of the DCI) included in the PDCCH, and the resource scheduling size (RB size) in the PDCCH including the corresponding C-RNTI may be set to 0. As described above, if a UE operating in a power saving mode has a PDCCH message (scrambled with C-RNTI) including a C-RNTI in a sub-frame in a paging occasion that is periodically generated and received, there is downlink data to be received. You can then try to reconnect to the network (assuming that paging received successfully). In this case, in addition to the C-RNTI, if the resource scheduling size is 0 as an additional condition, the terminal may perform the above operation.

Referring to FIG. 1G, in operation 1g-05, the last serving base station may receive a paging message for a specific terminal from the MME.

In operation 1g-10, the last serving base station may transmit a paging request including a specific terminal message and terminal ID information to the base station in the RAN PA (paging area).

In operation 1g-15, the last serving base station may transmit the C-RNTI to the terminal in the last serving base station area through the PDCCH of the subframe, which is the paging occasion of the terminal. At this time, the RB size in the PDCCH including the corresponding C-RNTI may be set to zero.

In operation 1g-20, the base station in the RAN PA may transmit a P-RNTI or an RP-RNTI to a terminal in its own area. The base station in the RAN PA may transmit the RP-RNTI or P-RNTI on the PDCCH of the subframe that is the paging occasion of the terminal.

The terminal in the region of the last serving base station receiving the message in the PDCCH including the C-RNTI or the C-RNTI having the RB size set to 0 may recognize that it is paging itself in the corresponding subframe in operation 1g-25. If there is a PDCCH message (scrambled with C-RNTI) including the C-RNTI, the UE determines that there is downlink data to be received (determined that paging has been successfully received). You can try to reconnect to the network.

Upon receiving the P-RNTI or RP-RNTI, the UE may confirm that the subframe receiving the P-RNTI or RP-RNTI includes a CN paging message or a RAN paging message transmitted to any UE in operation 1g-30. .

In operation 1g-35, the base station transmits a paging message through a PDSCH of the same subframe as the subframe in which the P-RNTI or the RP-RNTI is transmitted or a subframe indicated by the PDCCH including the P-RNTI or the RP-RNTI. The paging message may include RP-TMSI, S-TMSI or IMSI, which is a unique ID in the MME of the UE.

In operation 1g-45, the terminal in the base station area of the RAN PA checks whether its RP-TMSI, S-TMSI or IMSI is included in the paging message. If the paging message includes the RP-TMSI, S-TMSI or IMSI corresponding to the terminal itself, the operation proceeds to 1g-50, and the paging message does not include the RP-TMSI, S-TMSI or IMSI corresponding to the terminal itself. If so, proceed to operation 1g-55.

In operation 1g-50, the UE recognizes that the paging message is for itself and performs network reconnection. In operation 1g-55, the UE recognizes that the paging message is not about itself and resumes the sleep operation. The terminal may maintain a sleep state until the next paging occasion.

1ha and 1hb illustrate an example in which the last serving base station transmits a C-RNTI in a paging message according to an embodiment of the present disclosure.

1ha and 1hb, when the base stations in the RAN paging area paging the terminal using P-RNTI, RP-RNTI, etc., and transmits the paging message of the PDSCH for identifying the terminal, the last serving base station knows the terminal. An example of transmission including C-RNTI can be considered. In this case, other base stations in the RAN paging area may use RP-TMSI, S-TMSI, IMSI, etc., rather than C-RNTI.

In operation 1h-05, the last serving base station may receive a paging message for a specific terminal from the MME.

In operation 1h-10, the last serving base station may transmit a paging request including specific terminal message and terminal ID information to the base station in the RAN PA (paging area).

In operation 1h-15, the last serving base station may transmit a P-RNTI or an RP-RNTI to a terminal in the last serving base station region through a PDCCH of a subframe, which is a paging occasion of the terminal. In operation 1h-20, the base station in the RAN PA may transmit a P-RNTI or an RP-RNTI to a terminal in its own area. The base station in the RAN PA may transmit the RP-RNTI or P-RNTI to the PDCCH of the subframe, which is a paging occasion of the terminal. The terminal in the last serving base station area that receives the P-RNTI or RP-RNTI may receive P in operation 1h-25. It can be confirmed that the subframe receiving the -RNTI or RP-RNTI includes a CN paging message or a RAN paging message transmitted to any UE. Upon receiving the P-RNTI or RP-RNTI, the UE may confirm that the subframe receiving the P-RNTI or RP-RNTI includes a CN paging message or a RAN paging message transmitted to any UE in operation 1h-30. .

In operation 1h-35, the last serving base station transmits a paging message through a PDSCH of the same subframe as the subframe in which the P-RNTI or the RP-RNTI is transmitted or a subframe indicated by the PDCCH including the P-RNTI or the RP-RNTI. do. The paging message may include the C-RNTI.

In operation 1h-45, the terminal in the last serving base station region checks whether the C-RNTI which is the terminal ID is included in the paging message. If the C-RNTI is included in the paging message, the operation proceeds to operation 1h-50. If the C-RNTI is not included, the operation proceeds to operation 1h-55. In operation 1h-50, the UE recognizes that the paging message is for the UE and performs network reconnection. In operation 1h-55, the UE recognizes that the paging message is not about itself and resumes the sleep operation. The terminal may maintain a sleep state until the next paging occasion.

In operation 1h-40, the base station in the RAN PA transmits a paging message through a PDSCH of the same subframe as the subframe transmitting the P-RNTI or RP-RNTI or a subframe indicated by the PDCCH including the P-RNTI or RP-RNTI. send. The paging message may include RP-TMSI, S-TMSI or IMSI, which is a unique ID in the MME of the UE.

In operation 1h-60, the terminal in the base station area of the RAN PA checks whether its RP-TMSI, S-TMSI, or IMSI is included in the paging message. If the paging message includes the RP-TMSI, S-TMSI or IMSI corresponding to the terminal itself, the operation proceeds to 1h-65, and the paging message does not include the RP-TMSI, S-TMSI or IMSI corresponding to the terminal itself. If so, proceed to operation 1h-70.

In operation 1h-65, the UE recognizes that the paging message is for the UE and performs network reconnection. In operation 1h-70, the UE recognizes that the paging message is not about itself and resumes the sleep operation. The terminal may maintain a sleep state until the next paging occasion.

<How to distinguish between RAN based paging by adding Indicators>

Instead of using the new RNTI and TMSI, there may be a way to use the RNTI and TMSI and add an indicator to another field to distinguish paging.

The method of adding a 1 bit indicator to the DCI in the PDCCH is as follows.

Table 4 shows One Bit RAN Paging indicator for DCI format 1A / 1C, and Table 5 shows Two bits RAN Paging indicator for DCI format 1A / 1C.

The method of distinguishing between RAN Paging and CN Paging by adding 1 bit indicator in addition to UE Identity in PDSCH is as follows. Table 6 shows the One Bit RAN Paging indicator after Paging UE-Identity.

TABLE 6

The UE receiving this by using the indicator can distinguish whether the corresponding PagingUE-Identity and Paging message is RAN paging or CN paging, perform an operation according to its own state, and ignore the paging transmitted for other state purposes. .

<New RAN Paging Discontinuous Reception (DRX) Configuration>

In the new power saving state, the UE performs a sleep-wake operation with a certain rule similar to the IDLE mode operation. Such a discontinuous reception operation of the terminal is called DRX, and the terminal DRX operation in the power saving state should be signaled and controlled by the base station.

The DRX Cycle of such a UE may be signaled and controlled in the following manner.

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

TABLE 7

TABLE 8

In the environment where two kinds of paging coexist, CN paging and Ran paging, when RAN paging is newly defined and signaled as above, the system (base station and terminal) has CN paging with different paging occasion and paging cycle. You can also configure and use RAN paging. In this case, the terminal operating in the power saving state may use only the RAN paging period, and the terminal operating in the IDLE mode may use only the CN paging period. In addition, a terminal that desires more frequent and faster paging reception, such as SI Update or radio link failure recovery (cell reselection), may look at both paging occasions regardless of the state of the terminal. Of course, in this case, power consumption may be added as compared to the case of receiving only one type of paging due to the frequent paging reception of the terminal.

1I illustrates an example of an environment in which CN Paging and RAN Paging coexist with different periods and Pagin Occasion according to an embodiment of the present disclosure.

Config so that CN Paging and RAN paging have different cycles. An example of a UE operating and working is shown in FIG. 1I.

On the other hand, configure CN Paging and Ran Paging in the same cycle. And may have terminals with different states (IDLE and power saving) wake up at the same time. In this case, if a new RAN Paging Drx config exists, it can be set and signaled by setting the same value as CN Paging, and a new DRX config. You can also use CN Paging Config for RAN Paging without adding.

In this embodiment, config for reusing CN Paging to RAN Paging. Examples of are described in [FIG. 1J] and [Table 9].

FIG. 1J illustrates 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

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

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

TABLE 10

TABLE 11

<How terminal, base station and network delete terminal information>

The unique information and the network connection information of the terminal operating in the power saving state should be deleted from the terminal and the base station when the terminal is no longer available due to a transition to the IDLE state or a change that cannot be made. The information deletion time of the terminal and the network may be a case that satisfies various conditions, 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 transmitted a signal to the last serving cell that 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 transmitted a signal to the last serving cell that the UE is updated RAN paging area.

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

By the eNB indication signal (RRC message, MAC message,…)

-By the channel quality degradation is measured

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

-if the current measured 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 is measured

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

-if the current measured 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) responses reaches the max. threshold4

<How to send paging for System Information Update>

In 5G, system information can be divided into two or more components. Among these, the minimum system information for periodically transmitted network access may be referred to as the minimum SI, and the system information that may be transmitted by other broadcasting or unicasting (on-demand) may be called additional SI. In this case, the minimum SI and the additional SI may have the same update period, and only one of them may be updated.

In order to update the different system information, the next standard may set two or more different system information update periods. In this 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

1K illustrates one embodiment of Minimum / Additional SI modification Period operation in accordance with one embodiment of the present disclosure.

Operation of the period for updating the different system information may be individually assigned so that different periods do not overlap at different times, such an embodiment may be as shown in FIG. When the system information update and the change notification for this is made at the time that does not overlap, the terminal can update only the corresponding information in a corresponding period after receiving the specific change notification, thereby having the advantage of not having to update all the system information. In addition, the operation of the period may be assigned so that different periods overlap at the same time.

In order to update the different system information, the system may actually send paging messages including a change notification in the period immediately before the modification period for updating the system information. This paging message may be CN paging, RAN paging, or both.

Terminals connected to the network, operating in a power saving mode in the network, or camped on the network receive this paging information and update system information in the next Modification Period.

In this case, the system information change notification included in the paging message may be classified into minimum SI and additional SI, respectively, which may be reflected in the terminal operation as follows.

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

TABLE 14

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

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

TABLE 15

In addition, in receiving paging information including a change notification indicating that the system information will be changed soon, it may be considered that the reception period of each paging information is smaller than a modification period in which the change notification is continuously transmitted. Paging Cycle <modification period. In this case, the terminal receives a paging message each time including the same change notification, and this information is not only redundant but also brings power consumption of the terminal. Therefore, if the terminal decodes only the paging message including the first announcement, and later, among the paging messages transmitted within the same modification period, paging messages including only the same SI Update change notification can be distinguished and ignored, the power of the terminal Can reduce the cost.

To this end, an embodiment of the present invention proposes 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 shows new RNTI values for SI Update according to one embodiment of the present disclosure, and FIG. 1L shows one embodiment of SIU Update operation.

TABLE 16

<Method for quickly reconnecting to a terminal operating in power saving state>

There may be various methods for the UE operating in the power saving state to quickly reconnect to the network. The methods considered in this patent can be used when the distance between the transmitting and receiving end is relatively short and the characteristics of the uplink and downlink channels are similar, and the synchronization is similar, and occupies uplink resources in the downlink paging information. In this case, the UE performs a UL transmission immediately without a special UL synchronization operation (eg, RACH). The detailed procedure is as follows:

The uplink transmission resource allocation method in the paging PDCCH for fast re-connection is as follows.

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

According to the embodiment of the present invention, C-RNTI + Paging PCH + UL SCH configuration may be applied.

1M illustrates an embodiment of uplink transmission resource allocation in a paging PDCCH for fast re-connection according to an embodiment of the present invention.

The base station in which the C-RNTI previously used (or promised) exists (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI, thereby accessing the network to the terminal operating in the corresponding power saving state. Ask to resume. (connection resume)

At this time, the UL-SCH config resource is timed paging PCH config. It should be allocated after 3 TTI more than paging message transmission resource allocated by.

The terminal receiving the message receives the paging information through the paging PCH, and transmits a network resume connection request (connection resume request) to the UL-SCH.

Connection resume request When the transmission / reception is successful, the network and the terminal immediately recognize that the connection is completed, and the terminal transitions to RRC_CONNECTED.

C-RNTI + UL SCH configuration may be applied according to an embodiment of the present disclosure.

1N illustrates another embodiment of uplink transmission resource allocation in a paging PDCCH for fast re-connection according to an embodiment of the present disclosure.

The base station in which the C-RNTI previously used (or promised) exists (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI, thereby accessing the network to the terminal operating in the corresponding power saving state. Ask to resume. (connection resume)

The terminal receiving the message transmits a connection resume request through the UL-SCH.

Connection resume request When the transmission / reception is successful, the network and the terminal immediately recognize that the connection is completed, and the terminal transitions to RRC_CONNECTED.

According to an embodiment of the present disclosure, RNTI + Paging PCH + UL SCH configuration may be applied.

1O illustrates another embodiment of uplink transmission resource allocation in a paging PDCCH for fast re-connection according to an embodiment of the present disclosure.

The base station transmits a paging PDCCH using the RNTI, and requests the terminal operating in the corresponding power saving state to resume access to the network. (connection resume)

At this time, the UL-SCH config resource is timed paging PCH config. It should be allocated after 3 TTI more than paging message transmission resource allocated by.

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

Connection resume request When the transmission / reception is successful, the network and the terminal immediately recognize that the connection is completed, and the terminal transitions to RRC_CONNECTED.

1P illustrates a Paging PCH Config including UL-SCH according to an embodiment of the present disclosure. A fast network reconnection method is shown.

Referring to FIG. 1P, the system includes a base station and a terminal. The terminal may be a terminal in a light connection (LC) state or an inactive state.

In operation 1p-05, the base station transmits a paging PDCCH using RNTI to the terminal. The RNTI may be at least one of P-RNTI, C-RNTI, or RP-RNTI as described in each of the above embodiments. The paging PDCCH may include a paging PCH config and may include a UL-SCH config. The UL-SCH config resource is paging PCH config. It may be allocated to a subframe or TTI that is later in time than the paging message transmission resource allocated by. For example, the UL-SCH resource may be allocated after 3 TTI or more than the paging message transmission resource.

In operation 1p-10, the base station may transmit a paging message to the terminal. The paging message may include a terminal identifier. The terminal identifier may include at least one of IMSI, S-TMSI, C-RNTI, RP-TMSI, and the like.

In operation 1p-15, the terminal receives paging information through the paging PCH, and checks whether the terminal identifier is included in the received information.

If the terminal does not include its own terminal identifier proceeds to operation 1p-20. In operation 1p-20, the terminal performs a sleep operation until the next paging occasion.

The terminal proceeds to operation 1p-25 when the terminal identifier is included. In operation 1p-25, the UE transmits an RRC connection resume request through the UL-SCH. The UL-SCH transmission resource may use the UL-SCH resource allocated in the 1p-10 operation.

In operation 1p-30, the base station may transmit a random access response (RAR) and an RRC connection resume to the terminal. The UE may receive the RAR through the PDSCH. When the RRC connection resume request and the RRC connection resume are successfully transmitted / received as described above, the network and the terminal immediately recognize that the connectivity is completed, and the terminal state can be changed to RRC_CONNECTED.

Uplink transmission resource allocation and indicator addition method in paging PDCCH for fast re-connection will be described below.

The base station transmits a UL-SCH resource reservation for a response of the terminal (or for transmitting a resume request of the terminal) in the paging PDCCH, and transmits an indicator requesting the terminal to reconnect using the corresponding resource. Upon receipt of this, the UE recognizes that the message is a network reconnection request of the UE (explicit indication). At this time, the indicator may be included in the UL-SCH config.

According to an embodiment of the present disclosure, C-RNTI + Paging PCH + UL SCH configuration may be applied.

1Q illustrates an embodiment of uplink transmission resource allocation and indicator addition in a paging PDCCH for fast re-connection according to an embodiment of the present disclosure.

The base station in which the C-RNTI previously used (or promised) exists (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI, thereby accessing the network to the terminal operating in the corresponding power saving state. Ask to resume. (connection resume)

At this time, the UL-SCH config resource is timed paging PCH config. It should be allocated after 3 TTI more than paging message transmission resource allocated by.

The terminal receiving the message receives the paging information through the paging PCH, and if the reconnection request indicator is a promised value (usually 1), and transmits the network resume connection request (connection resume request) to the UL-SCH.

When the network reconnection request is successfully transmitted / received, the network and the terminal immediately recognize that the connection is completed, and the terminal state changes to RRC_CONNECTED.

According to an embodiment of the present disclosure, C-RNTI + UL SCH configuration may be applied.

FIG. 1R illustrates another embodiment of uplink transmission resource allocation and indicator addition in a paging PDCCH for fast re-connection according to an embodiment of the present disclosure.

The base station in which the C-RNTI previously used (or promised) exists (eg, the last serving eNB) transmits a paging PDCCH using the C-RNTI, thereby accessing the network to the terminal operating in the corresponding power saving state. Ask to resume. (connection resume)

The terminal receiving the message transmits a connection resume request to the UL-SCH if the reconnection request indicator is a promised value (usually 1).

When the network reconnection request is successfully transmitted / received, the network and the terminal immediately recognize that the connection is completed, and the terminal state changes to RRC_CONNECTED.

According to an embodiment of the present disclosure, P-RNTI + Paging PCH + UL SCH configuration may be applied.

1S illustrates another embodiment of uplink transmission resource allocation and indicator addition in a paging PDCCH for fast re-connection according to an embodiment of the present disclosure.

The base station transmits a paging PDCCH using the RNTI, and requests the terminal operating in the corresponding power saving state to resume access to the network. (connection resume)

At this time, the UL-SCH config resource is timed paging PCH config. It should be allocated after 3 TTI more than paging message transmission resource allocated by.

The terminal receiving the message receives the paging information through the paging PCH, if the re-connection request indicator is a promised value (usually 1) and if the UE specific id is included in the received information UL-SCH Sends a network resume request.

When the network reconnection request is successfully transmitted / received, the network and the terminal immediately recognize that the connection is completed, and the terminal state changes to RRC_CONNECTED.

1T illustrates a Paging PCH Config including UL-SCH and Indicator according to an embodiment of the present disclosure. A fast network reconnection method is shown.

Referring to FIG. 1T, the system includes a base station and a terminal. The terminal may be a terminal in a light connection (LC) state or an inactive state.

In operation 1t-05, the base station transmits a paging PDCCH using RNTI to the terminal. The RNTI may be at least one of P-RNTI, C-RNTI, or RP-RNTI as described in each of the above embodiments. The paging PDCCH may include a paging PCH config and may include a UL-SCH config and a connection request indicator (or connection resume request indicator). The UL-SCH config resource is paging PCH config. It may be allocated to a subframe or TTI that is later in time than the paging message transmission resource allocated by. For example, the UL-SCH resource may be allocated after 3 TTI or more than the paging message transmission resource.

In operation 1t-10, the base station may transmit a paging message to the terminal. The paging message may include a terminal identifier. The terminal identifier may include at least one of IMSI, S-TMSI, C-RNTI, RP-TMSI, and the like.

In operation 1t-15, the terminal receives paging information through the paging PCH, and checks whether the terminal identifier is included in the received information.

If the terminal does not include its own terminal identifier proceeds to operation 1t-20. In operation 1t-20, the UE performs a sleep operation until the next paging occasion.

The terminal proceeds to operation 1t-25 when its terminal identifier is included. In operation 1t-25, if the reconnection request indicator is a promised value (usually 1), the UE transmits an RRC connection resume request through the UL-SCH. The UL-SCH transmission resource may use the UL-SCH resource allocated in the 1t-10 operation.

In operation 1t-30, the base station may transmit a random access response (RAR) and an RRC connection resume to the terminal. The UE may transmit the RAR through the PDSCH. When the RRC connection resume request and the RRC connection resume are successfully transmitted / received as described above, the network and the terminal immediately recognize that the connectivity is completed, and the terminal state can be changed to RRC_CONNECTED.

Method for allocating a dedicated resource (time, frequency, code (Preamble)) that can be used for a limited uplink access request so that a corresponding terminal can quickly perform network access

RNTI + Preamble Transmission Method

1u is a diagram illustrating a RNTI + Preamble transmission method.

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

The base station receiving the dedicated RACH preamble recognizes that the terminal performs the network reconnection request, reconfigures the connection, and resumes the connection.

1V illustrates a Paging PCH Config including Dedicated RACH Preamble. 4 is a diagram illustrating a fast network reconnection method.

Referring to FIG. 1V, the system includes a base station and a terminal. The terminal may be a terminal in a light connection (LC) state or an inactive state.

In operation 1v-05, the base station transmits a paging PDCCH using RNTI to the terminal. The RNTI may be at least one of P-RNTI, C-RNTI, or RP-RNTI as described in each of the above embodiments. The paging PDCCH may include a paging PCH config and may include a dedicated RACH preamble.

In operation 1v-10, the base station may transmit a paging message to the terminal. The paging message may include a terminal identifier. The terminal identifier may include at least one of IMSI, S-TMSI, C-RNTI, RP-TMSI, and the like.

In operation 1v-15, the terminal receives paging information through the paging PCH, and checks whether the terminal identifier is included in the received information.

If the terminal does not include its own terminal identifier proceeds to operation 1v-20. In operation 1p-20, the terminal performs a sleep operation until the next paging occasion.

The terminal proceeds to operation 1v-25 when its terminal identifier is included. In operation 1v-25, the UE may start a RACH using a dedicated preamble, and may indicate that the corresponding RACH is a RACH for an RRC connection resume request.

Receiving the dedicated RACH preamble, the base station recognizes that the terminal performs the network reconnection request, reestablishes the connection with the terminal and resumes the connection with the terminal in operation 1v-30. The base station may transmit a random access response (RAR) and an RRC connection resume to the terminal. The UE may transmit the RAR through the PDSCH. When the RRC connection resume request and the RRC connection resume are successfully transmitted / received as described above, the network and the terminal immediately recognize that the connectivity is completed, and the terminal state can be changed to RRC_CONNECTED.

Paging Message + resource (time, frequency, code (Preamble)) transmission method is described below.

1W is a diagram illustrating a paging message + preamble transmission method.

The UEs receiving the paging message through the paging PCH start the RACH using the dedicated resource if the UE specific id is included in the received information, and indicate that the RACH is the RACH for the uplink reconnection request.

The base station receiving the dedicated RACH preamble recognizes that the terminal performs the network reconnection request, reconfigures the connection, and resumes the connection.

1x illustrates a fast network reconnection method using a paging message including a dedicated RACH preamble.

Referring to FIG. 1x, the system includes a base station and a terminal. The terminal may be a terminal in a light connection (LC) state or an inactive state.

In operation 1x-05, the base station transmits a paging PDCCH using RNTI to the terminal. The RNTI may be at least one of P-RNTI, C-RNTI, or RP-RNTI as described in each of the above embodiments. The paging PDCCH may include a paging PCH config.

In operation 1x-10, the base station may transmit a paging message to the terminal. The paging message may include a terminal identifier. The terminal identifier may include at least one of IMSI, S-TMSI, C-RNTI, RP-TMSI, and the like. The paging message may include a dedicated preamble. Alternatively, the dedicated preamble may be transmitted together with the paging message.

In operation 1x-15, the terminal receives paging information through the paging PCH, and checks whether the terminal identifier is included in the received information.

If the terminal does not include its own terminal identifier proceeds to operation 1x-20. In 1x-20 operation, the UE performs sleep until the next paging occasion.

The terminal proceeds to operation 1x-25 when its terminal identifier is included. In operation 1x-25, the UE may start a RACH using a dedicated preamble, and may indicate that the corresponding RACH is a RACH for an RRC connection resume request.

Receiving the dedicated RACH preamble, the base station recognizes that the terminal performs the network reconnection request, reestablishes the connection with the terminal and resumes the connection with the terminal in operation 1x-30. The base station may transmit a random access response (RAR) and an RRC connection resume to the terminal. The UE may transmit the RAR through the PDSCH. When the RRC connection resume request and the RRC connection resume are successfully transmitted / received as described above, the network and the terminal immediately recognize that the connectivity is completed, and the terminal state can be changed to RRC_CONNECTED.

<DL data direct transmission method using RNTI>

In order to transmit short information in downlink to a terminal operating in a power saving state, the network specifies the terminal using a known C-RNTI (or another new RNTI), and allocates downlink resources to the corresponding terminal to provide information. Can be transferred.

In this case, if the terminal does not need to synchronize uplink through random access, the base station allocates uplink ACK / NACK resources to the downlink transmission, receives a response from the terminal, performs retransmission and HARQ operation to perform DL transmission. It can increase the success rate.

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

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

Referring to FIG. 1Y, the terminal may include a transceiver 1y-10 and a controller 1y-30 for transmitting and receiving signals. The terminal may transmit and / or receive signals, information, messages, and the like through the transceiver 1y-10. The controller 1y-30 may control the overall operation of the terminal. The controller 1y-30 may include at least one processor. The controller 1y-30 may control the operation of the terminal described with reference to FIGS. 1A through 1X. The controller 1y-30 may include at least one processor.

In addition, the controller 1y-30 receives the beam feedback trigger condition, determines whether the beam feedback trigger condition is satisfied, and determines that the beam feedback trigger condition is satisfied, the medium access control (MAC) layer of the terminal. Triggers a beam feedback, and may control to transmit a MAC CE (control element) including beam feedback information based on the beam feedback trigger. The beam feedback trigger condition may include a case where the channel measurement value of at least one beam is greater than the sum of the preset threshold value and the channel measurement value of the current serving beam.

In addition, the controller 1y-30 may control to transmit the beam feedback information by using an uplink allocation resource received through a scheduling request (SR) procedure when the uplink of the terminal is synchronized. have. The terminal may transmit the SR, and may receive information about resources allocated for beam feedback based on the SR transmission. Resource allocation may be performed periodically or aperiodically.

In addition, if the uplink of the terminal is not synchronized, the controller 1y-30 may control to transmit the beam feedback information through a random access procedure. When the beam feedback is triggered, a random access preamble is transmitted, a random access response is received in response to a random access preamble transmission, the beam feedback information is transmitted based on receiving a random access response, and in response to the beam feedback information transmission Control to receive a random access contention result. The message for transmitting the beam feedback information may be MSG3 in a random access procedure.

In addition, the controller 1y-30 may receive the beam change indication information and, when receiving the beam change indication information, control to change the beam based on the beam feedback information after a preset time.

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

Referring to FIG. 1z, the base station may include a transceiver 1z-10 and a controller 1z-30 for transmitting and receiving signals. The base station may transmit and / or receive signals, information, messages, and the like through the transceiver unit 1z-10. The controller 1z-30 may control the overall operation of the base station. The controller 1z-30 may include at least one processor. The controller 1z-30 may control the operation of the base station described with reference to FIGS. 1A through 1X. The controller 1z-30 may include at least one processor.

In addition, the controller 1z-30 may transmit a beam feedback trigger condition to the terminal, and control the terminal 1z-30 to receive a medium access control (MAC) control element (CE) including beam feedback information from the terminal. The beam feedback information may be triggered when it is determined that the beam feedback condition is satisfied in the MAC layer of the terminal. That is, the beam feedback condition may be triggered according to the determination of the MAC layer of the terminal. The beam feedback trigger condition may include a case where the channel measurement value of at least one beam is greater than the sum of the preset threshold value and the channel measurement value of the current serving beam.

In addition, when the uplink of the terminal is synchronized, the controller 1z-30 allocates an uplink resource to the terminal through a scheduling reauest (SR) procedure and transmits the beam feedback from the allocated uplink resource. Control to receive information.

In addition, if the uplink of the terminal is not synchronized, the controller 1z-30 may control to receive the beam feedback information through a random access procedure. Receive a random access preamble from the terminal, transmit a random access response based on a random access preamble reception, receive the beam feedback information in response to the transmission of a random access response, random access contention based on the beam feedback information reception You can control to send the result. The message receiving the beam feedback information may be MSG3 in a random access procedure.

In addition, the controller 1z-30 transmits the beam change indication information based on the reception of the beam feedback information, and when the beam change indication information is transmitted, controls to change the beam based on the beam feedback information after a preset time. can do.

Example B Beam Grouping

According to an embodiment of the present invention, in a beam management method of a terminal and a base station, the terminal transmits beam measurement information to the base station, selecting a beam to use based on the beam measurement information of the terminal received by the base station, the base station is The method may include notifying beam information to be used to the terminal, and changing a beam currently used by the base station and the terminal to a new beam.

In addition, according to an embodiment of the present invention, in the terminal, in the step of transmitting the beam measurement information to the base station, if the base station changes the beam to each beam, the method comprising an indicator indicating whether it is necessary to send a beam change message And a beam changing method of the base station using such an indicator.

The wireless communication system considers a structure in which one base station including a large number of transmitting / receiving terminals capable of transmitting / receiving supports a large physical area in order to improve delays caused by frequent exchange of terminal information and to efficiently use resources.

Distributed Antenna System (DAS), which transmits or receives the same signal by simply implementing different transmitting / receiving terminals under one base station as a physical antenna,

Remote radio head (RRH) system capable of transmitting or receiving different signals by implementing different transmitting / receiving terminals under one base station in a structure including an antenna and a simple radio frequency (RF) stage,

Different transmitters / receivers under one or different base stations simultaneously transmit and receive the same information to one user, or the other transmitter / receiver is silent while one transmitter / receiver transmits / receives information. An example is a managed multi-point transmission / reception technology (CoMP) system.

Analog beamforming transmits different transmission powers and phases by using a plurality of array antennas to overlap the radiation patterns of the antennas, thereby forming a beam that obtains antenna gain with directivity in a specific direction.

Analog beamforming can set the beam in the desired direction without the channel information of the desired receiver from multiple antennas, only transmit / receive in one direction at a time (radiation pattern in the other direction is canceled). Strong straightness allows for longer beams with the same power and a large antenna gain (beam width / length differential depending on the number of antennas)

Digital beamforming utilizes multi-channel information between antennas having different strengths in a multi-antenna transmission / reception environment to apply a plurality of orthogonal beams to offset the desired inter-channel interference by applying different coding for each antenna to information before transmission. It is a technique to form.

Digital beamforming utilizes pre-coding techniques to transmit data to each antenna to make the best use of different channel characteristics.

In addition, single-user MIMO and multi-user MIMO can be supported.

Hybrid beamforming is a technology that uses analog beamforming and digital beamforming at the same time.

Hybrid beamforming is a technique that uses digital beamforming by using different pre-coding techniques for each antenna for beams and transmission antennas formed by analog beamforming.

The technique described in the embodiment of the present invention may be one of the techniques using the beam and the beamforming formed by the analog beamforming, the digital beamforming, and the hybrid beamforming. In addition, a method of occupying and transmitting any resource that can be divided into physical or frequency / time / code / signal for information transmission is called beamforming, and the applicable resource is applicable to all systems that call beam.

In addition, the characteristics of the associated technology used in the wireless communication technology conforming to the 3GPP standard are as follows.

Uplink, uplink (uplink: transmission from a station to a base station) transmission should be transmitted using resources reserved through the resource allocation of the base station (eNB).

A UE requiring uplink transmission transmits a scheduling request (SR) previously allocated by the base station to receive a resource for uplink transmission (specifically, a resource allocated by the base station after SR transmission). transmit a report, BSR) to inform the amount of data to be transmitted uplink, and then allocate resources and perform uplink transmission.) A random access channel (RACH) that can transmit contention-based contention with other UEs. Must be sent via).

The channel measurement information feedback includes a technique of informing the base station of channel information measured by the terminal, and includes channel measurement and feedback performed at the physical layer. Examples of such information include channel received signal strength (RSRP), reference signal received quality (RSRQ), signal-to-noise ratio (SNR), signal-to-noise ratio, and interference. Signal-to-interference-plus-noise ratio (SINR), channel quality quantization information (CQI), channel state inforamtion-reference signal (CSI-RS), etc. . Such information can be obtained by the UE by measuring any signal transmitted by the base station (CRS (cell specific reference signal or common reference signal), DRS (dedicated reference signal), CSI-RS, DMRS (demodulataion reference signal)).

The terminal may transmit the obtained information using the resources allocated by the base station according to the uplink transmission rule. If there is no resource allocated by the base station, there is no method or need to provide such information to the base station.

In order to improve efficiency, a wireless communication system transmits signals for maintaining connectivity, such as control signals and reference signals, using a common receivable frequency channel and time resource so that all users can hear them.

On the other hand, in the case of a multi-antenna using beamforming system in which resources such as frequency channel, time, beam, and code are allocated and used differently for different beams, beam characteristics (direction, The use of resources may not be possible due to the change of channel).

For example, in a system using a plurality of analog beams for transmission and reception, the terminal and the base station select and transmit specific information by selecting a specific beam estimated to have good performance. At this time, the base station reserves the resource advance reservation for uplink transmission of the terminal to use the best (or the most trouble-free) beam resources known at the time when the base station reserves resources. However, a change may occur in the channel of the reserved beam resource due to the movement of the terminal or other variables (eg, an obstacle such as a sudden appearance of a car, a climate change, etc.). When the uplink information transmission fails due to the change in the characteristics of the reserved beam resources, there is no way to solve this quickly with the existing technology.

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

In addition, in the case of the existing technology in which signals for maintaining connectivity, such as a control signal and a reference signal, are transmitted using a common receivable frequency channel and time resource for all users to listen to, the channel condition that is being used is overcome. The only method is to change to another channel of different frequency when there is another channel of different frequency, or to attempt to reconnect to the network after declaring a failure if the radio link failure condition is satisfied. .

However, in the case of a multi-antenna beamforming system in which resources such as frequency channel, time, beam, and code are allocated and used differently for different beams, other beams that can be used in the same position may not Since there is a high probability of existence and an opportunity to maintain connectivity through the terminal, a technology capable of utilizing the terminal is needed.

In the case of existing technology (Omni antenna use, digital beamforming use system, etc.), if the channel condition is not good, the way to overcome this is to change to another channel of different frequency or radio link failure ( If the RLF) condition is satisfied, the only way is to declare a failure and then reconnect to the network.

However, in a system using analog beamforming, even if the beam state of the beam being used is not good, there is a high possibility that there is another beam available in the same position, thereby maintaining the connection.

In the prior art, the terminal is a channel information feedback in which a method for informing the base station of a resource, particularly a channel state change, used in the base station is possible only in the physical layer. In the prior art, the terminal receives a specific signal (CRS, DRS, RS, Beam RS, CSI-RS, etc.) transmitted by the base station to determine the channel state, and then processes and packages the channel state information as feedback information (eg, : CQI, RI, PMI, etc.) and then using the uplink transmission resources allocated by the base station to the base station (eg, pshsical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), etc.), or UE The UE may transmit an uplink transmission request (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 using beamforming system in which resources such as frequency channel, time, beam, and code are allocated and used differently for different beams, unique resources (eg, analog beams and hybrid beams) used by the terminal / base station are used. In case of poor performance, a new procedure is needed to inform the base station of other available resource information and to allocate and use the corresponding resource in the future.

2A is a diagram illustrating a multi-beam system according to an embodiment of the present disclosure.

Referring to FIG. 2A, the system is composed of a base station and a terminal for forming an analog beam 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 in one direction may be performed by using one antenna array group at a time. In this case, when one or more antenna array groups that can be operated simultaneously are included, wireless transmission / reception may be performed in one or more directions at a time.

In an embodiment of the present disclosure, one or more base stations (or transmitting / receiving end) are included in a multi-antenna using beamforming system that allocates and uses resources such as frequency channels, times, beams, and codes differently for different beams. The environment is considered as an environment in which one or more beams are used to transmit / receive a pair of beams at a time. In addition, the base station or the terminal does not use a plurality of beams, for example, if one or more base stations, the terminal uses a single beam or if the base station uses one, the terminal uses more than one beam A possible beam information exchange method is proposed.

In a more detailed operation scheme, the UE measures beam information, provides beam information, and changes a beam in use, and then exchanges and changes beam information in use in the same base station (or transmitter / receiver). At that time, you can find a suitable beam and use that beam. In a multi-antenna-enabled beamforming system that allocates and uses resources such as frequency channels, times, beams, and codes differently for different beams, the base station and the terminal identify, track, and use the channel status of the transmit / receive beams in real time. It must be possible to maintain and change the beam.

Beam measurement is performed to measure the channel of beam pairs (beam pairs) that can come out of a combination of various beams between the terminal and the adjacent base station.

Beam measurement may be performed periodically or aperiodically, and may be performed by a terminal or a base station.

An embodiment of the present disclosure is not limited to any beam measuring method, and may be assumed to be an environment in which a terminal or a base station can measure channel states of beam pairs with each other.

According to an embodiment of the present invention, it is assumed that the terminal continuously performs an operation of measuring beam information by any method. As a result, it is assumed that the terminal performs an operation of updating and recognizing a measured value according to the measurement of beam information. can do.

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

Since downlink (or uplink) beam information is unknown to a base station (or terminal), which is a transmitting end, feedback from a terminal (or base station) is essential.

Beam information feedback may be performed periodically or aperiodically, and may be performed by a terminal or a base station.

An embodiment of the present disclosure provides an operation of delivering beam information measured by a terminal to a base station. However, the scope of the present disclosure is not limited to the beam feedback or the reporting of the terminal, and may be applied to correspond to the operation of transmitting the beam information measured by the base station to the terminal. Therefore, the following procedure for the beam feedback and the beam change of the terminal can be applied to the same / similar to the operation of the base station.

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

In order to perform the beam change, the base station or the terminal may determine a beam pair to be used in the future based on the received beam feedback information.

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

A terminal (UE) refers to a beam measurement entity that performs beam measurement, and a base station (eNB) transmits a reference signal for beam measurement and allocates resources to the beam measurement entity. For example, when the beam measuring entity informs the beam information through the measurement through the feedback, it means the beam using entity.

Although 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, the role is not limited to the terminal and the base station. The base station may be a subject that performs beam measurement and feedback, and the terminal may be a subject that transmits a beam reference signal or allocates resources.

The best beam (or best beams) is determined by the beam of the beam measuring entity and the beam of the beam using entity, which is estimated to have the best performance among the beam measuring subjects and the analog beams available to the beam using entity. When used, it may mean one beam pair (or beam pairs) consisting of beams of these two subjects, or two beams in the beam pair (or beam pairs), respectively. In the embodiment of the present invention, the best beam is generally used by the beam using entity (base station) to communicate with the beam measuring entity (terminal) within a best beam pair measured according to a reference signal transmitted by the beam using entity (base station). The beam may be the best beam performance of the subject, but is not limited thereto.

The beam measuring entity may inform the beam using entity of the information of the best beam pair (or beam pairs) through feedback, or may inform only the beam information of a single beam information to be used by the beam using entity. (For example, the terminal may inform only one beam information belonging to the base station to be used when the base station transmits / receives information to the corresponding terminal.)

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

Referring to FIG. 2B, one embodiment of a MAC-CE structure for transmitting N beam information (ID 9 bits and BRSRP 7 bits) may be identified.

BI (9-bit) is a field indicating the beam index.

BRSRP (7-bit): This field indicates the RSRP of the beam.

 Although FIG. 2B illustrates the BI as 9 bits and the BRSRP as 7 bits, each field may have a different number of bits.

2C is a diagram illustrating a frame structure for feeding back multiple beam ID and beam measurement values according to the present disclosure.

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

RBI (3-bit) is a field indicating the beam index.

RB-RSRP (7-bit) is a field indicating the reception RSRP of the beam.

R is reserved bit, set to "0".

Although FIG. 2C illustrates the RBI as 9 bits and the RB-RSRP as 7 bits, each field may have a different number of bits.

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 disclosure.

Referring to FIG. 2D, a MAC-CE structure for transmitting N beam information (eNB ID 9bit, UE ID 5bit, BRSRP 7bit) may be identified.

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

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

BRSRP (7-bit) is a field indicating the RSRP of the beam.

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

A method of adding an indicator for requesting transmission of Beam Change information is described below.

FIG. 2E is a diagram illustrating beam change through beam feedback, and FIGS. 2F and 2G are diagrams showing frame structures for transmitting beam feedback.

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 observed and measured information. Based on the channel measurement values, the UE feeds back measurement values and base station beam ID information for the top few or the best base station beams. As such, when the terminal provides only the information on the base station beam to the base station, when the base station receiving the information uses which beam, the terminal does not have information on which beam is received. In other words, when the base station wants to change from the current beam to a new beam at the time when the corresponding beam feedback information is received, the base station notifies the terminal that it will always attempt to change to the corresponding beam when changing to any beam. The UE and the terminal wait until the time promised to each other to perform the operation of changing the beam.

When a beam change request message is referred to as a beam change indication message (BCI), an example of the operation procedure is illustrated 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 every beam change, and the beam must be changed by waiting until a promised time. However, if the beam of the base station needs to be changed, but the terminal does not need to change the beam even if the base station beam is changed, the waiting time for the transmission of the beam change request message and the beam change is wasted. In fact, in a system environment that considers multi-paths and separated transmission reception points, the terminal may receive multiple beams of the same cell using one Rx beam. At this time, if the Rx beam information of the terminal is not included in the beam measurement information fed back to the base station, it becomes impossible to distinguish the case where it is not necessary to send the beam change request message (BCI) as described above. After the BCI is transmitted, a beam change is performed.

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

2F and 2G show examples of a method of transmitting by adding an indicator of 1 bit for one base station beam feedback according to an embodiment of the present disclosure.

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

When the base station changes the used beam to the corresponding beam, the indicator is set as an indicator indicating that the beam change request message should be transmitted to the terminal.

The terminal may manage the measured beam pair information in the following table:

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

TABLE 17

The UE generates beam feedback information to be transmitted to the network by arranging beam pairs having the best performance (best quality, best RSRP, RSRQ, CQI, SNR, SINR, ...) in descending order in the beam pair measurement information. :

 [Table 18] is an example of feedback information on beam pair measurement of K terminals.

TABLE 18

If the UE Rx beam ID in the beam measurement information feedback table is the same as the serving beam ID (the last beam ID) currently being used, the indicator is represented as 0, and in the other case, the indicator is represented as 1.

Alternatively, the same indicator may be allocated when the UE Rx beam IDs of the beam measurement information feedback tables are Rx beams that can be simultaneously received by the UE, and different indicators may be allocated when the Rx beams cannot be simultaneously received.

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

* Table 19

If the UE Rx beam ID is removed from the information, beam feedback information is completed.

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

TABLE 20

FIG. 2H is a diagram illustrating an operation of a base station and a terminal for changing from a base station beam currently being used as a (on, 1) base station beam whose indicator is turned on according to an embodiment of the present disclosure.

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

At this time, when the beam is changed from the base station beam currently being used by the (0) base station beam whose indicator is turned off, the base station may arbitrarily change without providing any information to the terminal. When the base station arbitrarily changes the beam without providing any information as described above, time consumption such as promising and waiting for BCI transmission and beam change to the UE is reduced, thereby enabling efficient and fast beam change.

In various embodiments of the present disclosure, 0 and 1 may be applied as the value of the indicator in the opposite manner to that described above, and the indicator is not limited to 1-bit information.

In addition, if the indicator is the same value, this may indicate the base station beams that the terminal can simultaneously receive. In this case, this may indicate that the terminal can simultaneously receive base station beams indicated by the indicator using the same rx beam (or usable simultaneous reception rx beams). In this case, the base station may transmit to the terminal using two or more base station beams indicated by the corresponding indicator at the same time.

2H is a diagram illustrating operations of a base station and a terminal for changing a base station beam used in accordance with one embodiment of the present disclosure to a base station beam having an indicator set to on.

Referring to FIG. 2H, in operation 2h-05, the UE may transmit beam measurement reporting to the base station. The terminal may generate beam measurement report information by measuring channel quality between the reception beam of the terminal and the transmission beam of the base station. The beam measurement report may include the information described in Tables 17 to 20. In addition, the beam measurement report information may include a transmission beam ID of the base station, a beam RSRP (or RSRQ, CQI, SNR, SINR, etc.) and an indicator.

In operation 2h-10, the base station may determine to change the beam currently being used for the terminal. The base station may determine whether to change the beam based on the beam measurement report received from the terminal.

In operation 2h-15, the base station may check the indicator included in the beam measurement report information. The base station may determine whether the transmission of the BCI message is necessary or whether it is necessary to wait for a predetermined time when changing the beam based on the indicator. For example, it may be determined whether the indicator for the beam to be changed is 1 or not. If the indicator is 0, the operation proceeds to 2h-20, and if the indicator is 1, the operation proceeds to 2h-25. The base station may recognize beam pairs having an indicator of 0 as one group and beam pairs having an indicator of 1 as one group.

If the indicator is 0, in operation 2h-20, the base station may change the beam without transmitting the BCI message to the terminal. Indicator 0 may indicate the transmission beam of the base station that can be received by the reception beam of the current terminal.

If the indicator is 1, in operation 2h-25, the base station may transmit a BCI message to the terminal. The BCI message may include identification information (eg, Beam ID) for the beam to be changed by the base station. Indicator 1 may indicate a transmission beam of a base station that is not receivable by the reception beam of the current terminal. In this case, when the base station changes to the corresponding transmission beam, the terminal needs to change the reception beam.

In operation 2h-30, the base station may wait for a predetermined time (or preset TTI, subframe) after transmitting the BCI message and then use the new beam. In operation 2h-35, the UE may wait for a predetermined time (or preset TTI, subframe) after receiving a BCI message and then use a new beam. The base station may use the changed transmission beam, and the terminal may use the changed reception beam.

The base station transmits downlink information using the changed transmission beam, and the terminal may receive downlink information transmitted by the base station using the current reception beam when the changed reception beam or the reception beam change of the terminal is unnecessary.

If the indicator changes to a beam other than 1, the BCI transmission / success and latency can be omitted, resulting in reduced latency.

In addition, the indicator may indicate the base station beams that the terminal can receive at the same time. In this case, this may indicate that the terminal can simultaneously receive base station beams indicated by the indicator using the same rx beam (or rx beams). In this case, the base station may transmit to the terminal using two or more base station beams indicated by the corresponding indicator at the same time.

When the base station changes the used beam with the corresponding beam, an indicator is provided that indicates that the base station can freely change the beam at any time without a special message.

FIG. 2I illustrates an operation of a base station and a terminal when the indicator is an indicator indicating that the base station can freely change the BCI without sending a BCI to the terminal according to an embodiment of the present disclosure.

In contrast to FIG. 2H, the Indicator may be an indicator indicating that the base station can freely change the base station without sending a BCI message.

The base station transmission beams having the indicator 0 may be used simultaneously for MIMO transmission to the terminal by the determination of the base station.

Referring to FIG. 2I, in operation 2i-05, the UE may transmit beam measurement reporting information to the base station. The terminal may generate a beam measurement report by measuring channel quality between the reception beam of the terminal and the transmission beam of the base station. The beam measurement report may include the information described in Tables 17 to 20. In addition, the beam measurement report is not limited thereto, and may include one of the beam pair measurement information feedback of the present invention. For example, the base station may include a transmission beam ID of the base station, a beam RSRP (or RSRQ, CQI, SNR, SINR, etc.) and an indicator. The indicator may be an indicator indicating that the base station can freely change without sending a BCI to the terminal.

In operation 2i-10, the base station may determine to change the beam currently being used for the terminal. The base station may determine whether to change the beam based on the beam measurement report received from the terminal.

In operation 2i-15, the base station may check the indicator included in the beam measurement report. The base station may determine whether the transmission of the BCI message is necessary or whether it is necessary to wait for a predetermined time when changing the beam based on the indicator. For example, it may be determined whether the indicator for the beam to be changed is 1 or not. If the indicator is 0, the operation proceeds to operation 2i-20, and if the indicator is 1, the operation proceeds to operation 2i-25. The base station may recognize beam pairs having an indicator of 0 as one group and beam pairs having an indicator of 1 as one group.

If the indicator is 0, in operation 2i-20, the base station may change the beam without transmitting the BCI to the terminal. Indicator 0 may indicate the transmission beam of the base station that can be received by the reception beam of the current terminal.

If the indicator is 1, in operation 2i-25, the base station may transmit a BCI to the terminal. The BCI message may include identification information (eg, Beam ID) for the beam to be changed by the base station. Indicator 1 may indicate a transmission beam of a base station that is not receivable by the reception beam of the current terminal. In this case, when the base station changes to the corresponding transmission beam, the terminal needs to change the reception beam.

In operation 2i-30, the base station may wait for a predetermined time (or preset TTI, subframe) after transmitting the BCI message and then use the new beam. In operation 2i-35, the UE may wait for a preset time (or preset TTI, subframe) after receiving the BCI and then use a new beam. The base station may use the changed transmission beam, and the terminal may use the changed reception beam.

The base station transmits downlink information using the changed transmission beam, and the terminal may receive downlink information transmitted by the base station using the current reception beam when the changed reception beam or the reception beam change of the terminal is unnecessary.

Indicator that the terminal can receive at the same time even if the base station is used as the transmission beam at the same time

When the indicator indicates that the terminal can simultaneously receive: This may indicate that the terminal can simultaneously receive base station beams indicated by the indicator using the same rx beam (or rx beams). In this case, the base station may simultaneously transmit two or more base station beams indicated by the indicator to the terminal.

In addition, the indicator is not necessarily 1 bit, the indicator of the same value may indicate a plurality of beams that can be transmitted at the same time.

In addition, the indicator may be used as any beam group ID set by the terminal. In this case, the base station recognizes that the terminal divides the base station beam into groups and distinguishes different groups to perform specific operations (eg, beam measurement and reporting). ) May be indicated.

When a terminal can operate one Rx beam at a time and can simultaneously receive beam transmissions of different base stations using the corresponding Rx beam, a method of preparing feedback information including beam indications of the terminal is as follows.

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

TABLE 21

The UE generates beam feedback information to be transmitted to the network by arranging beam pairs having the best performance (best quality, best RSRP, RSRQ, CQI, SNR, SINR, ...) in descending order in the beam pair measurement information. :

 [Table 22] is an example of feedback information on beam pair measurement of K terminals.

Table 22

Table 22 is a table listing measurement information grouped by a base station Tx beam and a terminal Rx beam pair in order of good performance. For example, in the example of Table 22, the channel performance (RSRP) of the 2nd base station Tx beam and the 1st terminal Rx beam is the best, and the channel performance (RSRP) of the 4th base station Tx beam and the 4th terminal Rx beam is the best. That means it was good next time.

The terminal that has completed the ordering according to the received signal strength of the beam pairs may allocate a beaming indicator by grouping beam pairs that can be simultaneously received by the same indicator.

[Table 23a] A table that allocates indicators by grouping beams that can be simultaneously received by the current terminal in order of performance

TABLE 23a

In Table 23a, the terminal allocates groups in the same order as their Rx beam IDs to distinguish base station-terminal beam pairs belonging to the corresponding group, and assigns them to the same indicator.

In Table 23a, the terminal assigns the indicator of the group to which the best base station-terminal beam pair belongs to 0, and then confirms that the good base station-terminal beam pair does not belong to indicator 0, and then assigns a new group indicator to 1. The third good base station-terminal beam pair has the same rx beam as the second good base station-terminal beam pair, so that the same group indicator as the second good base station-terminal beam pair is assigned. . With this rule, the terminal may sequentially group the information of the base station terminal beam pairs to which it will send (transmit) to the network.

In this case, it is appropriate that the terminal rx beam id column is removed and transmitted to the information actually fed back to the base station. Of course, a method of including and transmitting the corresponding terminal rx beam id may also be considered.

[Table 23b] A table for allocating indicators by grouping beams that can be simultaneously received by a current terminal in order of terminal reception beams

TABLE 23b

In [Table 23b], the terminal allocates groups in the same order as their Rx beam IDs to distinguish base station-terminal beam pairs belonging to the group, and assigns them to the same indicator.

In Table 23b, the terminal allocates an indicator of a group of each beam pair by using its Rx beam ID. For example, in the case of the base station-terminal beam pair having the terminal Rx beam ID of 4, the indicator is also assigned to 4. The disadvantage of this method is that the number of bits for indicator transmission must be guaranteed by the number of rx beams of the terminal regardless of the amount of beam information transmitted by the terminal in feedback. For example, if a terminal has 12 rx beams and only sends 4 beam measurement information each time, 4bit should be guaranteed so that the number of bits in the signal for the indicator can be 12 at maximum.

In this case, it is appropriate that the terminal rx beam id column is removed and transmitted to the information actually fed back to the base station. Of course, a method of including and transmitting the corresponding terminal rx beam id may also be considered.

*

[Table 23c] A table for configuring feedback transmission by grouping the same number of beams that can be simultaneously received by the current terminal for each group

TABLE 23c

In [Table 23c], the UE assigns beam pairs having the same Rx beam ID to the group indicator in the same order as in the performance order, and then includes the same number of beam pair information in the corresponding groups. Reconstructed.

In [Table 23a], the group indicators of the terminals are allocated in the performance order, but here [Table 23c] is assigned to the group indicator as shown in [Table 23a] (or [Table 23b] or by using any method). After allocating a), the number of beam pairs fed back to the base station in the corresponding group is equally adjusted to two and rearranged.

When providing the network with the same number of beam information for each group as described above, the network may transmit the number of beam pairs to be transmitted for each group in the downlink signal to the terminal.

For example, a base station that wants to receive two beam pair information for each group, as in the example of Table [23c], may deliver the number of beam pairs per group to the terminal using one of the following methods.

RRM measurement report configuration The total number of beam pairs to report, the number of beam pairs to report per group, and the number of groups to report may be transmitted. In this case, the UE transmits the group and the number of beam pairs to report per group in the RRM measurement report transmitted according to the condition. For example, when the total number of beam pairs to report is K, the number of beam pairs to report per group is L, and the number of groups to report is M, the UE can report in the following manner.

In the case of K> L x M, the UE provides the total L x M beam pair information to the network by L pieces for M groups.

If K <L x M, the terminal lists the beam pairs in order of good performance of each beam pair, and each group includes a maximum of L beams within a limit not exceeding the maximum M beam groups. The report signal is constructed so that the number is K and information is provided to the network.

When L = 0, M = 0, or L = ∞, M = ∞, the UE does not care about the number of beams per beam group, and K pairs of beam pairs in order of good performance, as shown in Table 23a and Table 23b. The reporting signal is configured as much as possible to provide information to the network.

The beam measurement information provided by the terminal may include information such as a base station transmission beam id, a terminal reception beam id, a beam measurement quantity (RSRP, RSRQ, SNR, SINR, CQI, ...), a group indicator, and the like.

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

In the case of K> L x M, the UE provides the total L x M beam pair information to the network by L pieces for M groups.

If K <L x M, the terminal lists the beam pairs in order of good performance of each beam pair, and each group includes a maximum of L beams within a limit not exceeding the maximum M beam groups. The report signal is constructed so that the number is K and information is provided to the network.

When L = 0, M = 0, or L = ∞, M = ∞, the UE does not care about the number of beams per beam group, and K pairs of beam pairs in order of good performance, as shown in Table 23a and Table 23b. The reporting signal is configured as much as possible to provide information to the network.

The beam measurement information provided by the terminal may include information such as a base station transmission beam id, a terminal reception beam id, a beam measurement quantity (RSRP, RSRQ, SNR, SINR, CQI, ...), a group indicator, and the like.

On the other hand, it is suitable to remove and transmit the terminal rx beam id column for information actually fed back to the base station. Of course, a method of including and transmitting the corresponding terminal rx beam id may also be considered.

A method of adding an indicator for requesting transmission of beam change information of a terminal that can simultaneously use multiple Rx beams will be described below.

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 observed and measured as described above.

As described above, the terminal may feed back the measured values and the base station beam ID information of the top few or the best base station beams by adding an indicator.

As such, in the method of providing beam feedback information in which an indicator is added to the base station, when the terminal can operate two or more different reception beams at the same time, the indicator and the beam feedback information may be configured as follows.

A.  If the terminal needs to change to a reception beam other than two or more reception beams currently being used for wireless communication, a method of transmitting beam feedback by displaying an indicator as ON (= 1, true)

An indicator is displayed as 0 for a transmission beam of a base station that can be received using a beam that the terminal is using to transmit. For other beams, the indicator is indicated by 1 to transmit.

[Table 24] When the UE rx beam IDs currently used by the UE are 1 and 2, the table includes indicators in feedback information of beam pair measurement information of the K terminals.

TABLE 24

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

*

[Table 25] When the UE rx beam IDs currently in use by the UE are 1 and 2, this is a table including an indicator in the completed beam feedback.

TABLE 25

In order to change from the currently used base station beam to the (1) base station beam whose corresponding indicator is turned on, the base station must change the beam through a procedure such as transmitting a BCI message to the terminal.

In this case, the corresponding indicator is an indicator indicating that communication is possible only when a beam in which the indicator is turned on uses a terminal beam different from the terminal beam currently being used by the terminal.

At this time, when changing from the base station beam currently being used to the (off, 0) base station beam that the indicator is turned off, the base station can change arbitrarily without providing any special information to the terminal. When the base station arbitrarily changes the beam without such a special procedure, it is possible to efficiently and fast change the beam by reducing time waste such as waiting for a BCI message transmission and waiting for the beam change.

In addition, the indicator may indicate the base station beams that the terminal can receive at the same time. In this case, this may indicate that the terminal can simultaneously receive base station beams indicated by the indicator using the same rx beam (or rx beams). In this case, the base station may transmit to the terminal using two or more base station beams indicated by the corresponding indicator at the same time.

On the other hand, it is suitable to remove and transmit the terminal rx beam id column for information actually fed back to the base station. Of course, a method of including and transmitting the corresponding terminal rx beam id may also be considered.

Provided are a method of using beam change / beam simultaneously using an indicator of a base station.

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

On the other hand, if the indicator indicates that the UE can receive using the same rx beam, so that the BCI message for the beam change is to be used, the beam does not need to be transmitted and the beam change procedure is not performed. The beam can be used freely.

In addition, the indicator may indicate the base station beams that the terminal can receive at the same time. In this case, this may indicate that the terminal can simultaneously receive base station beams indicated by the indicator using the same rx beam (or rx beams). In this case, the base station may transmit to the terminal using two or more base station beams indicated by the corresponding indicator at the same time.

On the contrary, a method used as an indicator indicating a case where simultaneous reception is impossible is described below.

The indicator may indicate base station beams that are not simultaneously received by the terminal. In this case, this may indicate that the base station beams indicated by the corresponding indicator by the terminal using the same rx beam (or rx beams) cannot be simultaneously received. The base station may transmit to the terminal by using two or more base station beams included in different indicator groups at the same time.

Alternatively, when the terminal can use multiple Rx beams at the same time, base station beams that cannot be simultaneously received should not be used for the base station in order to obtain diversity gain using these different rx beams based on the same rx beam or maximize diversity gain. It can also be grouped and indicated in a way that makes it possible.

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

A method of transmitting the first beam feedback according to the beam selection for initial connection will be described below.

FIG. 2J is a diagram illustrating operations of a base station and a terminal for a first beam feedback transmission method according to beam selection for initial access according to an embodiment of the present disclosure.

Referring to FIG. 2J, in order to select an indicator to be included in the beam feedback, the UE needs to recognize an rx beam currently being used. To this end, we propose a method of selecting the first rx beam when the terminal first accesses the network, and then select an indicator in the beam feedback to be transmitted based on this.

When the terminal and the base station specifies a usable beam using a method other than beam feedback,

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

When the terminal performs random access in any way and successfully receives the RAR from the base station using a specific beam

When the terminal successfully receives the UE specific message from the base station in any way

When the terminal and the base station specify the available beam using beam feedback,

The UE indicates that a beam change message is required (eg, 1) and transmits all indicators in beam feedback transmitted before the beam is specified.

A transmission scheme including beam group information in the beam change indication of the base station is described below.

When the terminal configures and transmits beam information to the base station in a group, the base station may select the following methods when transmitting a beam change indication for using a new beam in downlink to the corresponding terminal.

How to send beam ID to change and beam group ID to which beam to change belongs together

The network may transmit a beam ID and a beam group ID to be changed to the UE. For example, if the beam group ID is an ID indicating a bundle of beams that can be simultaneously received by the mobile station, if the base station transmits such a beam group ID, the mobile station uses the received base station by using the received beam by identifying the beam group ID. You can determine if you need to receive the transmission. In a multi-antenna transmit / receive structure, which may occur even when one base station beam can be received by two or more terminal beams, such beam classification may be performed because the same base station beam may belong to two or more different terminal beam groups. This terminal has a merit of simplifying the operation of the terminal by giving a clear message that it should be received using any beam group. On the other hand, there is an overhead that the base station must perform an additional operation of identifying and selecting such a terminal group. Considering a battery operated terminal, there may be an advantage in that the network may perform such an operation and not perform the terminal to increase 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 mobile station, if the base station transmits such a beam group ID, the mobile station uses the received base station by using the received beam by identifying the beam group ID. You can determine if you need to receive the transmission. The terminal only needs to be able to successfully receive information from the base station and transmit its own information, so that only the terminal beam can be selected properly. This method has the advantage of simplifying the operation of the terminal by giving the terminal a clear message that it should be received using any beam group. In addition, there is an advantage that the beam can be superimposed or changed in the group at any time the base station desires.

The terminal receiving the beam group ID performs later communication using a terminal Rx beam (or Rx beams) capable of receiving base station information transmitted by the corresponding beam group ID. This operation may be the same as the beam changing operation of FIG. 2E, and may be transmitting the signal including the beam group ID instead of the beam ID in the downlink information transmitted only for beam change.

According to an embodiment of the present disclosure, the terminal may measure a performance degradation of a beam or beams in use and use the same to trigger a beam recovery procedure for recovering to another beam. At this time, the procedure for determining the degradation of the beam being used is called a beam failure detection procedure, and the conditions for triggering the beam recovery procedure including the beam failure detection procedure can be performed as follows.

According to the Beam Failure Detection method, the beam may be any beam (base station beam, terminal beam, or pair of base station beam and terminal beam) that the terminal and the base station are in use, or the terminal and the base station explicitly (or implicitly). It may be any set of beams in use.

Herein, the beam may be a physical antenna configuration or may be a measurement unit (eg, SS block, SS burst, SS burst set, CSI-RS block, CSI-RS burst, CSI-RS burst set) of any terminal.

Resource / RS configuration is achieved by beam recovery transmission resource allocation (i.e., RACH time / frequency / sequence, or any dedicated / common resource).

The beam (or beams) information (beam ID, RS location, frequency, time, etc.) to which the UE compares Condition 1 may be a threshold, offset, etc. required by the UE.

L1 detection may be performed.

If the beam (s) measured by the physical layer satisfy Condition 1, beam failure is determined.

The physical layer sends the indication to the upper layer for later operation.

The upper layer starts the beam recovery procedure after receiving the indication.

L2 detection with L1 indication may be performed.

When the beam (s) measured by the physical layer satisfy Condition 1, the corresponding indication is transmitted to the upper layer.

When the L2 layer receives one or more indications from the physical layer and the reception of the indications satisfies Condition 2, the L2 layer determines beam failure and / or beam recovery triggering.

The L2 layer starts the beam recovery procedure.

L3 detection with L1 indication may be performed.

When the beam (s) measured by the physical layer satisfy Condition 1, the corresponding indication is transmitted to the upper layer.

When the L3 layer receives one or more indications from the physical layer and reception of the indications satisfies Condition 2, the L3 layer determines beam failure and / or beam recovery triggering.

The L3 layer starts the beam recovery procedure.

L2 detection with L1 indication may be performed.

When the beam (s) measured by the physical layer satisfy Condition 1, the corresponding indication is transmitted to the upper layer.

When the UE receives one or more indications from the physical layer and the reception of the indications satisfies Condition 2, the UE may attempt to transmit the UL beam feedback using L1 feedback and / or L2 feedback.

The L2 layer determines beam failure and / or beam recovery triggering when certain Condition 3 is satisfied.

The L2 layer starts the beam recovery procedure.

*

L3 detection with L1 indication may be performed.

When the beam (s) measured by the physical layer satisfy Condition 1, the corresponding indication is transmitted to the upper layer.

When 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 a UL beam feedback using a previously allocated resource (L1 feedback and / or L2 feedback and / or L3 reporting). )do.

The L3 layer determines beam failure and / or beam recovery triggering when any condition 3 is satisfied.

The L3 layer begins the beam recovery procedure.

The condition 1 may be a measurement value of the base station control channel including beam (s) measured by the terminal <Threshold1.

Condition 1 may be an estimated DL signal reception error probability> N1%.

Condition 1 may be a beam (s) measurement <Threshold1 (AND) any one beam measurement> Threshold 2.

Condition 1 may be any set1 of beams measurement value <Threshold1 previously agreed with the base station (or configured from the base station).

The Condition 1 may be any condition created by a combination of the conditions.

The condition 2 may be to receive (i.e., L1 OOS) N2 indications that are the same as or consecutive to condition1.

The condition 2 may be the reception of more than N3 indications (i.e., L1 OOS) within a predetermined time (timer2).

Condition 2 may be any one beam measurement> Threshold 2.

Condition 2 may be a measure of any beam> Threshold2 in any set2 of beams previously promised (or configured from a base station).

If any timer1 triggered immediately after the condition1 is satisfied expires

The timer1 may be a value set by the terminal implementation.

In case that IS is not received from L1 in timer1.

: When the UL signal transmission is not successful in the timer1

: Condition1 is maintained in timer1

The timer1 may be a value configured by the base station.

* The timer1 may be canceled when receiving an indication (i.e., In-sync-indicaiton) from the lower layer.

The timer1 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

Condition 3 may be continuous N4 indication reception (i.e., L1 OOS) or N5 or more indication reception (i.e., L1 OOS) within a predetermined time (timer2).

Condition 3 may be any one beam measurement> Threshold3.

Condition 3 may be a measurement value of Threshold3 of any beam in any set2 of beams previously promised (or configured from the base station).

If any timer2 triggered immediately after the condition2 is satisfied expires

The timer2 may be a value set by the terminal implementation.

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

When not receiving IS from L1 in timer2

: When the UL signal transmission is not successful in the timer2

Condition1 and / or conditon2 conditions are maintained in timer2

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

The timer2 is a time value greater than any Threshold4, and may be a timer indicating a position of an uplink transmittable resource (PRACH, SR resource, etc.) to arrive within the closest time after the time exceeding the threshold4.

The timer2 may be canceled when receiving an indication (i.e., In-sync-indicaiton) from the lower layer.

The timer2 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 Beam Recovery Request signal Transmission method is described below.

The terminal may perform a beam recovery operation when the beam failure condition is satisfied. Specifically, the terminal may transmit an uplink beam recovery request signal for beam recovery.

To this end, the terminal may immediately trigger the UL beam recovery request signal when the beam failure condition 2 is satisfied.

FIG. 2K illustrates a method in which a UE attempts to transmit a beam recovery request when a condition2 condition is satisfied according to an embodiment of the present disclosure in association with an RLF operation.

Referring to FIG. 2K, if the condition (Condition2) is satisfied, the UE immediately triggers an uplink beam recovery request signal transmission to arrive within the closest time. At this time, if the difference between the resource to perform the uplink transmission and the triggered time is large, it waits for the corresponding time to determine whether the corresponding triggering condition is satisfied or not resolved.

In addition, between the Trigger time point and the actual transmission time point, the UE continuously transmits a UL signal by using a pre-allocated uplink resource. At this time, even if the measured value of the corresponding resource is less than any threshold (condition1), uplink transmission (beam resumption) may be attempted to increase the success rate.

If the triggered uplink beam recovery request signal (BRR) transmission time has not arrived, if the triggering condition (Condition1) is resolved (if no longer satisfied), the UE can cancel all the ongoing procedures. For example, even if the received signal strength of a beam is below a certain threshold and the corresponding uplink BRR signal transmission is triggered, if it is observed again that the received signal strength of the beam is above the threshold before the transmission time arrives, Uplink BRR signal transmission may be canceled.

The terminal may trigger the UL beam recovery request signal after condition 3 is satisfied after the beam failure condition is satisfied.

FIG. 2L illustrates a method in which a UE attempts to transmit a beam recovery request when a condition2 condition is satisfied according to an embodiment of the present disclosure in association with an RLF operation. Figure 2l is an example of performing the operation just waiting for the time until the arrival of the PRACH, when the fixed timer is over.

Referring to FIG. 2L, if the condition (condition2) is satisfied, the UE sets a condition3 (for example, a timer), waits for the condition to be satisfied, and continuously transmits a UL signal by using an allocated uplink resource. At this time, even if the measured value of the corresponding resource is less than any threshold value (condition1) may be attempted uplink transmission to increase the success rate.

The terminal triggers an uplink beam recovery request signal transmission that will arrive within the closest time immediately after Condition3 is satisfied.

At this time, if there is a difference between the time when the condition 3 is satisfied and the resource to perform the UL beam recovery request transmission, the operation performed when the condition 2 is satisfied while waiting for the corresponding time (beam resumption) Link feedback) and determine whether condition1 is not resolved.

If Condition3 is not satisfied and the corresponding triggering condition (Condition1) is resolved (no longer satisfied), the UE can cancel all the procedures in progress. For example, even if the received signal strength of a beam is below a certain threshold and the corresponding uplink BRR signal transmission is triggered, if it is observed again that the received signal strength of the beam is above the threshold before the transmission time arrives, Uplink BRR signal transmission may be canceled. If a resource time point for performing UL beam recovery request transmission has not arrived, if the corresponding triggering condition (Condition1) is resolved (if no longer satisfied), the UE may cancel all the procedures in progress. For example, even if the received signal strength of a beam is below a certain threshold and the corresponding uplink BRR signal transmission is triggered, if it is observed again that the received signal strength of the beam is above the threshold before the transmission time arrives, Uplink BRR signal transmission may be canceled.

In addition, if Radio Link Failure (RLF) is performed first when Condition 3 is not satisfied, or Radio Link Failure is declared before Condition 3 is satisfied but the closest PRACH arrives, the UE cancels all beam recovery operations in progress. And perform an operation according to the RLF.

FIG. 2M illustrates a method in which a UE attempts to transmit a beam recovery request when certain condition 2 conditions are satisfied according to an embodiment of the present disclosure in association with an RLF operation.

Referring to FIG. 2M, the UE performs a BRT declared by Condition1 or Condition2 and performs a beam resumption operation (ie, allocated resource utilization uplink feedback) until any condition3 is satisfied (ie, fixed timer expiration). An example of performing beam resumption operation (ie, pre-allocated resource use uplink feedback) while attempting beam recovery using a PRACH when condition 3 is satisfied (ie, timer expire) is shown. At this time, beam recovery using PRACH may be continuously performed when the condition 1 is satisfied, may be attempted only during the timer with any timer_br, or may be attempted until successive (or discontinuous) N_max_br failures are made. have.

FIG. 2N illustrates a method in which a UE attempts to transmit a beam recovery request when a condition2 condition is satisfied according to an embodiment of the present disclosure in association with an RLF operation.

Referring to FIG. 2N, a UE declares a BRT by Condition 1 or Condition 2 and attempts beam recovery using PRACH while simultaneously performing a beam resumption operation (i.e., pre-allocated resource use uplink feedback). At this time, beam recovery using PRACH may be continuously performed when the condition 1 is satisfied, may be attempted only during the timer with any timer_br, or may be attempted until successive (or discontinuous) N_max_br failures are made. have.

FIG. 2o illustrates a method in which a terminal attempts to transmit a beam recovery request when a condition2 condition is satisfied according to an embodiment of the present disclosure in association with an RLF operation.

Referring to FIG. 2O, the UE sets a certain condition3 (eg, a timer), waits for a corresponding condition to be satisfied, and continuously transmits a UL signal by using an allocated uplink resource (beam resumption). At this time, even if the measured value of the corresponding resource is less than any threshold value (condition1) may be attempted uplink transmission to increase the success rate.

Even if the fixed timer has ended, the UE may continue to perform beam resumption until a PRACH arrival time or a Radio Link Faillure declaration time. The terminal triggers an uplink beam recovery request signal transmission that will arrive within the closest time immediately after Condition3 is satisfied.

In addition, if Radio Link Failure (RLF) is performed first when Condition 3 is not satisfied, or Radio Link Failure is declared before Condition 3 is satisfied but the closest PRACH arrives, the UE cancels all beam recovery operations in progress. And perform an operation according to the RLF.

FIG. 2P illustrates a method in which a UE attempts to transmit a beam recovery request when certain condition 2 conditions are satisfied according to an embodiment of the present disclosure in association with an RLF operation.

Referring to FIG. 2P, when the T310 timer for the RLF is triggered, the UE may simultaneously trigger a beam recovery request. To this end, 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 condition 1 or condition 2, the terminal may transmit it to the upper layer to trigger the T310 timer. To this end, 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 (RSs) for measuring each channel may be RSs and channels previously scheduled by the base station.

The candidates for the beam failure detection RSs include a UE-specific resource scheduled CSI-RS with dedicated signal configured including a CSI-RS having resources / characteristics allocated only for the corresponding UE.

Alternatively, candidates for beam failure detection RSs include a cell-specific resource scheduled CSI-RS with dedicated signal configured including a CSI-RS having resources / characteristics allocated for an unspecified multiple terminal.

Alternatively, the candidates for the beam failure detection RSs include an NR-Sync Signal (PSS, SSS, PBCH) including a synchronization signal and a broadcast channel signal having resources / characteristics allocated for an unspecified multiple terminal.

The beams used to perform the beam recovery (such as a new candidate beam or a RACH performing beam) may be RSs previously scheduled by the base station or RSs that the UE can measure by itself.

Candidates of the beam recovery identification RSs include a UE-specific resource scheduled CSI-RS with dedicated signal configured including a CSI-RS having resources / characteristics allocated only for the corresponding UE.

Candidates of the corresponding beam recovery identification RSs include a cell-specific resource scheduled CSI-RS with dedicated signal configured including a CSI-RS having resources / characteristics allocated for an unspecified multiple terminal.

Candidates of the corresponding beam recovery identification RSs include an NR-Sync signal (PSS, SSS, PBCH) including a synchronization signal and a broadcast channel signal having resources / characteristics allocated for an unspecified multiple terminal.

The reference signals (RSs) used to perform the cell level problem detection may be RSs that are previously scheduled by the base station or are measurable by the terminal.

The RLF declaration method due to the beam recovery failure is described below.

According to an embodiment of the present disclosure, the terminal may declare an RLF when the performed beam recovery operations continuously fail. Specifically, the UE may declare an RLF when beam recovery has failed N_RLF1 times consecutively (NACK count count or failure indication count count).

In addition, the UE may declare an RLF if it fails in Timer_RLF1.

In addition, the UE may declare an RLF when N_RLF2 fails in Timer_RLF2. (Even if discontinuous)

In addition, the UE may declare the RLF when receiving the RLF declaration request DL signal from the network (or from Node-B) for the recovery attempt.

In addition, the UE may declare an RLF after a beam failure declaration (by Condition 1 or Condition 2) when no attempt is made to perform beam recovery more than Timer_RLF3 (when dissatisfaction of Condition 3).

Referring to FIG. 1Y, the transceiver 1y-10 of the terminal may transmit and receive a signal. The transceiver 1y-10 may transmit and receive signals under the control of the controller 1y-30. The controller 1y-30 of the terminal may control the overall operation of the terminal. The controller 1y-30 may control the terminal to perform the operation described with reference to FIGS. 2A through 2P.

For example, the controller 1y-30 performs beam measurement on at least one transmission beam of the base station and at least one beam of the terminal, and transmits beam measurement information to the base station based on the beam measurement. It may be controlled to receive downlink information transmitted from the new transmission beam of the base station. The new transmission beam of the base station may be changed based on the relationship between the current reception beam of the terminal and the new transmission beam of the base station included in the beam measurement information.

If the new transmission beam of the base station corresponds to the current reception beam of the terminal, the transmission beam of the base station may be changed without receiving a beam change indication message from the base station. If the new transmission beam of the base station does not correspond to the current reception beam of the terminal, the controller 1y-30 may control to receive a beam change indication message from the base station.

In addition, after the preset time elapses after transmitting the beam change indication message, the reception beam of the terminal and the transmission beam of the base station may be changed. The beam measurement information includes an indicator, and the indicator may indicate whether the terminal can receive the transmission beam of the base station as the current reception beam of the terminal.

The transceiver 1z-10 of the base station 1z-00 may transmit and receive signals. The transceiver 1z-10 may transmit and receive signals under the control of the controller 1z-30. The controller 1z-30 of the base station may control the overall operation of the base station. The controller 1z-30 may control the base station to perform the operation described with reference to FIGS. 2A through 2P.

For example, the controller 1z-30 receives beam measurement information from a terminal, determines a change of a transmission beam of the base station for the terminal based on the beam measurement information, and includes the beam measurement information. It is possible to control to change the transmission beam of the base station based on the relationship between the current reception beam of the terminal and the new transmission beam of the base station.

In addition, if the new transmission beam of the base station corresponds to the current reception beam of the terminal, it is possible to change the transmission beam of the base station without transmitting a beam change indication message. In addition, the controller 1z-30 may control to transmit a beam change instruction message to the terminal if the new transmission beam of the base station does not correspond to the current reception beam of the terminal. In addition, after the predetermined time elapses after transmitting the beam change indication message, the transmission beam of the base station may be changed.

In addition, the beam measurement information includes an indicator,

The indicator may indicate whether the terminal can receive the transmission beam of the base station as the current reception beam of the terminal.

The embodiments disclosed in the specification and the drawings are only specific examples to easily explain the contents of the present invention and assist in understanding, and are not intended to limit the scope of the present invention. Therefore, the scope of the present invention should be construed that all changes or modifications derived based on the technical spirit of the present invention are included in the scope of the present invention in addition to the embodiments disclosed herein.

Claims (20)

In the method of operation of a base station in a wireless communication system,
Receiving beam measurement information from a terminal;
Determining a transmission beam change of the base station for the terminal based on the beam measurement information; And
And changing the transmission beam of the base station based on the relationship between the current reception beam of the terminal and the new transmission beam of the base station included in the beam measurement information. The method of claim 1, wherein if the new transmission beam of the base station corresponds to the current reception beam of the terminal, the transmission beam of the base station is changed without transmitting a beam change indication message. The method of claim 1, further comprising: transmitting a beam change indication message to the terminal if the new transmission beam of the base station does not correspond to the current reception beam of the terminal. The method of claim 3, wherein after transmitting a beam change indication message and a preset time elapses, the transmission beam of the base station is changed. The method of claim 1, wherein the beam measurement information includes an indicator,
And the indicator indicates whether the terminal can receive the transmission beam of the base station as the current reception beam of the terminal. In the base station,
Transmitting and receiving unit for transmitting and receiving a signal; And
Receive beam measurement information from the terminal, determine the transmission beam change of the base station for the terminal based on the beam measurement information, the current reception beam of the terminal and the new transmission beam of the base station included in the beam measurement information And a control unit controlling to change the transmission beam of the base station based on the relationship of the base station. The base station according to claim 6, wherein if the new transmission beam of the base station corresponds to the current reception beam of the terminal, the transmission beam of the base station is changed without transmitting a beam change indication message. The method of claim 6, wherein the control unit,
And if the new transmission beam of the base station does not correspond to the current reception beam of the terminal, controls to transmit a beam change indication message to the terminal. The base station according to claim 8, wherein the transmission beam of the base station is changed after a preset time elapses after transmitting the beam change indication message. The method of claim 6, wherein the beam measurement information includes an indicator,
And the indicator indicates whether the terminal can receive a transmission beam of the base station as a current reception beam of the terminal. In the method of operation of a terminal in a wireless communication system,
Performing beam measurements on at least one transmit beam of a base station and at least one beam of the terminal;
Based on the beam measurement, transmitting beam measurement information to the base station; And
Receiving downlink information transmitted from the new transmission beam of the base station,
The new transmission beam of the base station is changed based on the relationship between the current reception beam of the terminal and the new transmission beam of the base station included in the beam measurement information. 12. The method of claim 11, wherein if the new transmission beam of the base station corresponds to the current reception beam of the terminal, the transmission beam of the base station is changed without receiving a beam change indication message from the base station. 12. The method of claim 11, further comprising receiving a beam change indication message from the base station if the new transmit beam of the base station does not correspond to the current receive beam of the terminal. The method of claim 13, wherein after receiving a predetermined time after transmitting the beam change indication message, a reception beam of the terminal and a transmission beam of the base station are changed. The method of claim 11, wherein the beam measurement information includes an indicator,
And the indicator indicates whether the terminal can receive the transmission beam of the base station as the current reception beam of the terminal. In the terminal,
Transmitting and receiving unit for transmitting and receiving a signal; And
Perform beam measurement on at least one transmission beam of the base station and at least one beam of the terminal, transmit beam measurement information to the base station based on the beam measurement, and transmit downlink transmitted from the new transmission beam of the base station A control unit for controlling to receive link information,
And the new transmission beam of the base station is changed based on the relationship between the current reception beam of the terminal and the new transmission beam of the base station included in the beam measurement information. The terminal of claim 16, wherein when the new transmission beam of the base station corresponds to the current reception beam of the terminal, the transmission beam of the base station is changed without receiving a beam change indication message from the base station. The method of claim 16, wherein if the new transmission beam of the base station does not correspond to the current reception beam of the terminal,
And the control unit controls to receive a beam change instruction message from the base station. 19. The terminal of claim 18, wherein after receiving a predetermined time after transmitting the beam change indication message, a reception beam of the terminal and a transmission beam of the base station are changed. The method of claim 16, wherein the beam measurement information includes an indicator,
And the indicator indicates whether the terminal can receive the transmission beam of the base station as the current reception beam of the terminal.

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