KR102016106B1 - Methods for changing connection status and Apparatuses thereof - Google Patents
Methods for changing connection status and Apparatuses thereof Download PDFInfo
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- KR102016106B1 KR102016106B1 KR1020170044062A KR20170044062A KR102016106B1 KR 102016106 B1 KR102016106 B1 KR 102016106B1 KR 1020170044062 A KR1020170044062 A KR 1020170044062A KR 20170044062 A KR20170044062 A KR 20170044062A KR 102016106 B1 KR102016106 B1 KR 102016106B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/34—Selective release of ongoing connections
Abstract
The present invention relates to a control plane signaling method and apparatus for reducing signaling due to a change of a terminal state, and more particularly, to a method of efficiently changing a terminal connection state in a wireless network without changing the mobility or state transition of the terminal in a core network. According to an embodiment of the present invention, in a method of changing a connection state of a terminal, the terminal transmits terminal capability information indicating that the terminal supports light connection to the base station and instructs a state change from the base station to the light connection state. It provides a method and apparatus comprising the step of receiving an RRC message including the indication information and the operation of changing the connection state of the terminal from the RRC connection state to the light connection state based on the indication information.
Description
The present invention relates to a control plane signaling method and apparatus for reducing signaling due to a change of a terminal state, and more particularly, to a method of efficiently changing a terminal connection state in a wireless network without changing the mobility or state transition of the terminal in a core network.
As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals. Mobile communication systems such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series are high-speed, high-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services. The development of technology capable of transferring large amounts of data is required.
In addition, due to an increase in terminals using machine type communication (hereinafter, referred to as "MTC" communication), data transmission and reception through a mobile communication system is rapidly increasing. Meanwhile, in case of MTC communication, it is necessary to periodically transmit and receive a small amount of data, and a low power low cost terminal may be used.
Therefore, a technique for transmitting and receiving data by a plurality of terminals is required while reducing power consumption.
In particular, in the case of a terminal transmitting a small amount of data periodically or aperiodically, it is necessary to change the RRC connection state in order to transmit a small amount of data. However, in order to change the RRC connection state by the conventional method, the data transmission / reception procedure of the terminal, the base station, the base station, and the core network is very complicated.
This transmission and reception procedure causes a relatively very high data load compared to a small amount of data to be transmitted by the terminal. That is, there is a problem that unnecessary data overload occurs in the RRC connection state change procedure for transmitting a small amount of data.
This problem will result in increasing the data load on the entire communication system as more terminals for periodically transmitting a small amount of data.
Therefore, according to such a change in the wireless communication environment, a study on a method and procedure for changing a specific terminal connection state capable of transmitting and receiving a small amount of data without seriously increasing the data load of the entire communication system is required.
In the above-described background, an embodiment of the present invention adds a light connection state to an RRC connection and an RRC idle in addition to the RRC connection and RRC idle, thereby reducing the load of the entire communication system and speeding data transmission and reception. It is intended to propose a method and an apparatus for configuring to be made.
In addition, an embodiment is to propose a specific procedure for the terminal to perform the connection state transition, including the light connection connection state.
In order to solve the above-mentioned problems, an embodiment of the present invention provides a method for changing a connection state of a terminal, the method comprising: transmitting terminal capability information indicating that the terminal supports light connection to the base station and writing from the base station; Receiving an RRC message including instruction information indicating a state change to a connection state and changing the connection state of the terminal from the RRC connection state to the light connection state based on the indication information; To provide.
In addition, according to an embodiment of the present invention, a method of changing a connection state of a terminal by a terminal, the method comprising: receiving terminal capability information indicating that the terminal supports a light connection state from the terminal and entering the light connection state to the terminal; Transmitting the RRC message including the indication information indicating the state change of the step and changing the connection state with the terminal from the RRC connection state to the light connection state, the light connection state is the base station and the core network for the terminal The connection state is maintained, but all SRBs and DRBs of the UE provide a method in which a state is suspended.
In addition, an embodiment of the present invention provides a terminal for changing a connection state, wherein the terminal transmits terminal capability information indicating support for light connection to a base station and an instruction for indicating a state change from a base station to a light connection state. It provides a terminal device including a receiving unit for receiving an RRC message including information and a control unit for performing an operation for changing the connection state of the terminal from the RRC connection state to the light connection state based on the indication information.
In addition, according to an embodiment of the present invention, in a base station for changing a connection state of a terminal, a state in a light connection state to a receiver and a terminal that receives terminal capability information indicating that the terminal supports a light connection state from the terminal And a control unit for transmitting an RRC message including the indication information indicating the change and a controller for changing a connection state from the RRC connection state to the light connection state, wherein the light connection state is a connection between the base station and the core network for the terminal. The base station apparatus maintains a state, but all SRBs and DRBs of the terminal are in a suspended state.
The embodiments described above provide an effect of reducing the data load of the entire communication system by providing a reduced signaling procedure for a terminal that performs frequent connection state changes.
In addition, the present embodiments provide data load reduction through fast connection state change of a terminal and reduction of core network signaling.
1 is a diagram illustrating a specific procedure for changing the connection state of a conventional terminal by way of example.
2 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment.
3 is a flowchart illustrating an operation of a terminal according to another embodiment.
4 is a flowchart illustrating an operation of a base station according to an embodiment.
5 is a flowchart illustrating an operation of a base station according to another embodiment.
6 is a diagram illustrating a terminal configuration according to another embodiment.
7 is a diagram illustrating a configuration of a base station according to another embodiment.
Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.
In the present specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In the present specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, in the present specification, the MTC terminal may mean a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
In other words, in the present specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations. Alternatively, in the present specification, the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or supports UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or lower power consumption). low complexity) can mean UE category / type.
The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition, user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
A base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS. Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.
In other words, in the present specification, a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.
Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station. The eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, and the like, according to the configuration of the radio region, become an embodiment of the base station. In ii), the base station may indicate the radio area itself to receive or transmit a signal from the viewpoint of the user terminal or the position of a neighboring base station.
Therefore, megacells, macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit and receive points, transmit points, and receive points are collectively referred to as base stations do.
In the present specification, the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to. The user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
In addition, in a system such as LTE and LTE-advanced, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. The uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like. Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
On the other hand, control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
A wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal. antenna transmission system), a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission / reception points and terminals.
The multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
In the following, downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal, and uplink refers to a communication or communication path from a terminal to multiple transmission / reception points. In downlink, a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.'
In addition, hereinafter, a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.
That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
In addition, for convenience of description, the EPDCCH, which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the EPDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.
Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.
The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.
Connection state transition procedure of terminal
In the conventional mobile communication technology, the terminal and the network state are divided into a terminal idle state and a connected state. The terminal and the network state are consistent. For example, states in the wireless network (E-UTRAN) and the core network (for example, the RRC state and the ECM state) coincide. That is, when the UE transitions to the RRC-IDLE state, the UE enters the ECM-IDLE state. When the UE transitions to the RRC-CONNECTED state, the UE enters the ECM-CONNECTED state. According to the terminal state, in order to transmit data, the terminal in the idle state has to perform a complicated signaling process as shown in FIG. 1. In particular, when a terminal transmits a small amount of data, it becomes a large overhead.
1 is a diagram illustrating a specific procedure for changing the connection state of a conventional terminal by way of example.
Referring to FIG. 1, the terminal 100 transmits a random access preamble to the
The
When the RRC connection setup is completed to the terminal 100, the
The
Thereafter, the
The terminal 100 transmits a UDP / IP packet to the base station 110 (S115), and the
Through this procedure, the terminal 100 delivers the packet to the core network.
Thereafter, the terminal 100 transmits a measurement report to the
After the
Through this procedure, the RRC connection terminal may transition to the RRC idle state.
As described above, in the prior art, a plurality of signaling procedures are required between the terminal and the base station, the base station, and the core network in order for the terminal to transition from the RRC idle state to the RRC connected state or from the RRC connected state to the RRC idle state. In this procedure, when the UE periodically transmits a small amount of data, overhead occurs continuously. On the other hand, in order to reduce the overhead due to the state transition, the terminal can be kept connected, but in this case, even when there is no data transmission, the network state must be periodically measured according to the measurement configuration, and the unnecessary power such as reporting the measurement result. Consumption may be caused. In addition, when maintaining the RRC connection state, there is a problem in that the handover signaling overhead increases according to the movement of the terminal.
NB- IoT Connection state transition for terminal Procedure
The narrow band IoT terminal is operated in a fixed state and may be installed at a specific location or located within a specific range. Due to this characteristic, the NB-IoT terminal and the base station support the Suspend / Resume procedure. In the RRC connection release message, the base station may request that the terminal maintains an AS context in the RRC_IDLE state. When the terminal receives the RRC connection release message including the RRC suspend information and transitions to the RRC IDLE state (or before the base station sends the message to the terminal), the base station sends an S1 message requesting the state transition of the terminal to the core network. Send ECM IDLE state.
The RRC connection resume procedure is used for an RRC Connected transition in RRC IDLE where information previously stored in the terminal and the base station is used to resume the RRC connection. When the UE transitions to the RRC Connected state by initiating the RRC connection resume procedure (after the base station sends the RRC connection resume message to the UE), the base station sends an S1 message to the core network requesting the state transition of the UE to the ECM CONNECTED state. Enter
However, even in this case, the RRC connection state and the ECM connection state are made the same, and thus there is a problem in that unnecessary overhead is generated between the base station and the core network. That is, as described above, in the conventional mobile communication technology, there is a signaling overhead problem due to a state transition, and the suspend / resume procedure for the fixed location terminal that can reduce the problem can be applied only to the NB-IoT terminal. . Accordingly, when the terminal leaves the cell (or base station) provided with the previously stored AS context, the terminal had to perform a service request procedure as shown in FIG. 1 to transmit the uplink data. In addition, since the UE transitions from the Suspend state to the Resume state is the same as the transition between the IDLE state and the CONNECTED state, there is a problem of continuously inducing core network signaling (S1 signaling).
In order to solve this problem, a specific procedure of shifting only the wireless network connection state without core network signaling is proposed.
In the prior art, the terminal and the base station have a core network because a state of a wireless network connection has occurred based on signaling and user data generated at an upper layer (eg, Non Access Stratum, IP, GTP, etc.) of an AS (Access Stratum). In order to shift only the wireless network connection state without signaling, a specific operation procedure is required.
In addition, when only the network connection state is changed without the core network signaling, the incoming data for the corresponding terminal may not be properly received. As a solution to this problem, a method of triggering paging itself in a wireless network can be considered, but this method has not been suggested. In particular, paging according to the prior art is triggered through the core network. Therefore, a method of triggering paging in a wireless network may have a problem in that it cannot sufficiently provide a paging function triggered through the core network.
The present invention devised to solve the above-mentioned problem is to provide a method and apparatus for effectively transmitting and receiving data by performing a wireless network state transition without accompanying core network signaling to reduce core network signaling overhead. The purpose.
Embodiments described below may be applied to a terminal using any mobile communication technology. For example, the present embodiments may be applied to next generation mobile communication (eg, 5G mobile communication) terminals as well as mobile communication terminals to which LTE technology is applied. For convenience of description, the base station may refer to an eNode-B of LTE / E-UTRAN, and the base station (CU, DU, or CU) in a 5G wireless network in which a central unit (CU) and a distribution unit (DU) are separated from each other. DU may represent an entity implemented as one logical entity).
Core network Signaling How to perform stateless wireless network transition
In order to reduce signaling due to a state transition of the terminal, the base station maintains a connection between the base station and the core network (for example, an S1 connection in LTE or an interface connection between the base station and the core network entity in 5G) to the terminal. Some or all of the UE's operation in the RRC idle state (eg, cell reselection, paging, radio resource release / suspend / suspend, some radio resource maintenance / standby) to consume terminal power similar to the idle state. Can be instructed to perform
For convenience of description, in the present specification, a state in which a part or all operations of an RRC idle state is performed in a state in which a control plane or a user plane connection is maintained on a base station and a core network interface with respect to a terminal is represented as a light connection state. The light connection state includes a new RRC state, a substate of an RRC connection, a terminal mobility providing connection state, a wireless network paging state, a connection waiting state, an RRC idle state maintaining an S1 connection, an RRC idle state maintaining a core network connection, and an S1 connection. It may be referred to in various terms such as a standby state, a light connection state, and there is no limitation on the name.
Further, in the light connection state, when the base station instructs to switch the RRC connected terminal to the light connection state, it is possible not to send a terminal context release request message to the core network. That is, signaling for releasing the connection on the interface between the core network and the base station is not performed. Or (S1) connection on the interface between the core network and the base station is maintained. For reference, in the related art, when the base station releases the RRC connection state to the terminal, the base station sends a terminal context release request message to request the MME to release the logical S1 connection associated with the terminal.
As described above, in the present specification, the connection state of the newly defined terminal is described as a light connection state, but as described above, the light connection state is a state of the RRC idle state while the base station and the core network connection to the terminal are maintained. The present invention corresponds to an exemplary name indicating a state of performing some operations, but the present invention is not limited to the corresponding name.
Hereinafter, a method of transitioning a write connection state of a terminal according to the present embodiment will be described in detail.
2 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment.
Referring to FIG. 2, the terminal transmits terminal capability information indicating that the terminal supports light connection to the base station (S210). For example, the terminal may transmit information on whether the terminal supports the light connection state to the base station. That is, the terminal may transmit to the base station that the RRC connection, the RRC idle, and the light connection state are supported.
For example, the terminal capability information may be delivered to the base station or the core network through the AS capability or the NAS capability. As another example, the terminal capability information may be included in the terminal radio access capability or the terminal core network capability.
The terminal may deliver the terminal capability information to the base station through RRC signaling.
The light connection state means a state in which a connection state between a base station and a core network for a terminal is maintained, but all signaling radio bearers (SRBs) and data radio bearers (DRBs) of the terminal are suspended. That is, the write connection state may mean a state in which the RRC and ECM states are inconsistent.
The terminal performs the step of receiving an RRC message including the indication information indicating the state change to the light connection state from the base station (S220). For example, the RRC message may be an RRC connection reconfiguration message or an RRC connection release message. Alternatively, the indication information may be included in a newly defined RRC message.
The terminal performs an operation of changing the connection state of the terminal from the RRC connection state to the light connection state based on the indication information (S230). For example, when the terminal receives indication information indicating a state change to the light connection state from the base station, the terminal stops all SRBs and DRBs for the base station. However, unlike the RRC idle state, the terminal may store the terminal context. In this case, the base station also stores the terminal context for the terminal. Through this, when the UE in the light connection state transitions to the RRC connection state, the UE and the base station may perform fast data transmission and reception using the stored UE context again.
In addition, the UE in the write connection state may perform a cell reselection operation instead of handover. That is, since the RRC connection of the terminal is similar to the released state with the base station, when the terminal is moved, the terminal may perform a procedure of reselecting a cell.
3 is a flowchart illustrating an operation of a terminal according to another embodiment.
Referring to FIG. 3, the terminal may change back to the RRC connection state from the state in which the terminal has transitioned to the light connection state through the above-described steps S210 to S230.
To this end, the terminal may transmit an RRC connection resumption request message to the base station (S340). For example, when a transition to the RRC connection state is triggered, the UE in the light connection state may transmit an RRC connection resumption request message to the base station to perform a transition operation from the light connection state to the RRC connection state.
For example, the state change to the RRC connected state may be triggered by any one of paging message reception, origination data trigger, and origination signaling trigger. Specifically, when the paging message for the terminal in the light connection state is received, the terminal may perform a transition operation to the RRC connected state. Alternatively, when outgoing data to be transmitted to the base station is triggered from the terminal in the light connection state, the terminal may perform a transition operation to the RRC connected state. Alternatively, when the outgoing signaling to be transmitted to the base station is triggered by the terminal in the light connection state, the terminal may perform a transition operation to the RRC connected state.
Meanwhile, the RRC connection resume request message may include cause information that causes a state change trigger to the RRC connection state. The cause information that causes the trigger may include information on whether paging, outgoing data trigger, or outgoing signaling trigger.
4 is a flowchart illustrating an operation of a base station according to an embodiment.
Referring to FIG. 4, the base station may perform a step of receiving terminal capability information indicating that the terminal supports a light connection state from the terminal (S410). The base station may receive the terminal capability information from the terminal to confirm that the terminal supports the RRC connection, RRC idle and light connection state.
For example, the terminal capability information may be delivered to the base station or the core network through the AS capability or the NAS capability. As another example, the terminal capability information may be included in the terminal radio access capability or the terminal core network capability. The base station may receive the terminal capability information through RRC signaling.
As described above, the write connection state may mean a state in which the connection state between the base station and the core network for the terminal is maintained, but all SRBs and DRBs of the terminal are suspended.
The base station may perform the step of transmitting an RRC message including the indication information indicating the state change to the light connection state to the terminal (S420). The base station may transmit an RRC message to transition the terminal to the light connection state. For example, the RRC message may be an RRC connection reconfiguration message or an RRC connection release message. Alternatively, the indication information may be included in a newly defined RRC message.
The base station may perform the step of changing the connection state with the terminal from the RRC connection state to the light connection state (S430). The base station stops all the SRB and DRB for the terminal when the terminal transitions to the right connection state. However, unlike the RRC idle state, the base station may store the terminal context of the terminal. Through this, when the UE in the light connection state transitions to the RRC connection state, the UE and the base station may perform fast data transmission and reception using the stored UE context again.
The base station may also control the transition to the RRC connected state for the terminal in the light connection state. This will be described with reference to FIG. 5 below.
5 is a flowchart illustrating an operation of a base station according to another embodiment.
Referring to FIG. 5, the base station may transition the terminal to the light connection state through steps S410 to S430. Thereafter, the UE may transition back to the RRC connection state.
For example, the base station may receive an RRC connection resumption request message requesting a state change from the light connection state to the RRC connection state from the terminal (S540). For example, when a transition to the RRC connection state is triggered for the UE in the light connection state, the base station may receive an RRC connection resumption request message and perform an RRC connection state transition operation of the UE.
For example, the state change to the RRC connected state may be triggered by any one of a paging message reception, an originating data trigger, and an originating signaling trigger of the terminal. Specifically, when the paging message for the terminal in the light connection state is transmitted, the terminal may perform a transition operation to the RRC connected state. Alternatively, when outgoing data to be transmitted to the base station is triggered from the terminal in the light connection state, the terminal may perform a transition operation to the RRC connected state. Alternatively, when the outgoing signaling to be transmitted to the base station is triggered by the terminal in the light connection state, the terminal may perform a transition operation to the RRC connected state.
Meanwhile, the RRC connection resume request message may include cause information that causes a state change trigger to the RRC connection state. The cause information that causes the trigger may include information on whether paging, outgoing data trigger, or outgoing signaling trigger.
2 to 5 described above may be changed in order, or some steps may be omitted or added.
Hereinafter, various embodiments of individual step operations of the embodiments described with reference to FIGS. 2 to 5 will be described.
Terminal light connection To pass support or not Example
The base station should accurately recognize the capability of the terminal (hereinafter, referred to as UE or terminal for convenience of description, which may mean a 5G terminal as well as an LTE terminal) in order to provide a proper configuration to the terminal. RRC signaling carries AS capabilities and NAS signaling carries NAS capabilities. The core network control plane entity (for example, MME, hereinafter referred to as core network control plane entity as MME) stores UE capabilities (or terminal capability consisting of UE Radio Access Capability and UE Core Network Capability).
For example, UE Core Network Capability may be indicated by the UE through NAS signaling (attach procedure, etc.). As another example for this purpose, UE Radio Access Capability may be delivered from the terminal to the base station using the UE capability transfer procedure and may be delivered through the S1 interface. As another example for this purpose, the UE Radio Access Capability may be indicated by the terminal to the MME through NAS signaling (attach procedure, etc.) and delivered to the base station through the S1 interface.
If available, the MME transmits UE Radio Access Capability to the base station whenever the UE enters RRC Connected. For example, the MME may transmit UE radio capability to the base station through an S1 Initial context setup request message.
The base station may request UE capability information from the terminal if necessary. For example, after the handover is completed, the base station may obtain UE capability information from the terminal using a UE capability transfer procedure and then transfer it to the MME.
For example, information for indicating that the write connection is supported may be defined in UE capability information (eg, UE radio capability information). As another example, the information indicating that the write connection is supported may be defined by modifying / extending UE capability information for NB-IoT suspend / resume (or AS context caching).
The base station may receive information for indicating that the terminal supports the write connection by using the above-described methods.
light connection Configuration Example
The base station may indicate the light connection state to the terminal individually or in combination with the following method.
1) Define a new release cause in the RRC Connection Release message and indicate it.
When the base station recognizes that the terminal supports the write connection, the base station may transmit to the terminal an RRC connection release message indicating the release of the write connection (releasecause).
Upon receiving the RRC connection release message indicating the cause of the light connection, the terminal may perform an operation for the light connection state.
The terminal operation for the write connection state indicates that one or more of the following operations are performed.
Terminal context storage
-Stores the terminal information on the light connection status
Perform some or all operations (eg, cell reselection, paging, radio resource release / suspend / suspend) of the RRC IDLE terminal;
1-1) Embodiment of Processing Without Instructing Light Connection Status to Upper Layer
The UE that has received the RRC connection release message indicating the cause of the light connection to release the light connection state to a higher layer to hide a state transition to a higher layer (NAS: Non Access Stratum and / or a user plane radio bearer higher layer). May not be indicated. In this case, the upper layer cannot distinguish between the light connection states.
As an example, when outgoing data (MO data) to be transmitted in the light connection state is generated, the data is transferred to the PDCP buffer mapped to the bearer in consideration of the RRC connected state. If a radio resource suspend operation is performed according to the light connection state transition and the PDCP entity is suspend, data transmission cannot be performed. Therefore, if the terminal receiving the RRC connection release message indicating the cause of the release of the light connection does not indicate the state of the light connection to the upper layer, the PDCP must be maintained in the light connection state (or the PDCP must be kept the same as the connection state). do). When data is received in the PDCP buffer, it must be able to initiate a transition to the RRC connection. For example, when the terminal receives the PDCP SDU from the PDCP entity in the light connection state, the UE may request a transition from the light connection state to the connected state in the RRC.
As another example, when outgoing signaling (for example, MO signaling and NAS signaling) to be transmitted in the write connection state occurs, the UL Information Transfer RRC message may be transmitted to the base station in consideration of the RRC connected state. Since the UE RRC entity may know that the UE is in the light connection state, when an outgoing signaling (for example, MO signaling or NAS signaling) to be transmitted may occur, the UE may initiate a transition to the RRC connection state.
1-2) An embodiment of indicating a light connection state to an upper layer and switching only the RRC connection state
Upon receiving the RRC connection release message indicating the cause of the release of the light connection, the UE may indicate the light connection state to a higher layer. In this case, the upper layer may distinguish the light connection state.
For example, when outgoing data (MO data) to be transmitted in the light connection state occurs, the upper layer (eg, NAS) of the terminal may not trigger the service request procedure. When sending data (MO data) occurs in the light connection state (pending data to be sent), the upper layer (eg, NAS) of the terminal is a lower layer (eg, RRC) to the lower layer (eg, RRC) in the RRC connection state The transition to the furnace can be indicated. The RRC may initiate a transition from the light connection state to the RRC connected state when receiving a transition indication from the upper layer to the RRC connected state.
As another example, when outgoing signaling (eg, MO signaling or NAS signaling) to be transmitted in the light connection state occurs, the upper layer (eg, NAS) of the terminal may not trigger a service request procedure. When outgoing signaling to be transmitted in the light connection state occurs, the upper layer (eg, NAS) of the terminal may indicate a transition from the light connection state to the RRC connection state to the lower layer (eg, RRC). The RRC may initiate a transition from the light connection state to the RRC connection state when receiving a transition indication from the upper layer to the RRC connection state in the light connection state. That is, upon receiving a transition indication from the upper layer to the connected state in the light connection state on the RRC, the RRC may initiate the transition from the light connection state to the connected state.
When the UE initiates the transition to the RRC connected state by receiving a transition indication from the upper layer to the connected state in the light connection state, the terminal transmits corresponding NAS signaling information (eg, the transition indication to the light connection state) to the base station. There is no need to pass it through to the core network.
1-3) An embodiment of indicating a light connection state to an upper layer and performing an upper layer procedure
Upon receiving the RRC connection release message indicating the cause of the release of the light connection, the UE may indicate the light connection state to a higher layer. In this case, the upper layer may distinguish the light connection state.
As an example, when outgoing data (MO data) to be transmitted in the light connection state is generated, an upper layer (eg, NAS) of the terminal may trigger a service request procedure.
As another example, when outgoing data (MO data) to be transmitted in the light connection state occurs, an upper layer (eg, NAS) of the terminal may trigger a NAS procedure (eg, an attach procedure or a TAU procedure).
As another example, when outgoing data (MO data) to be transmitted in the light connection state occurs, the upper layer (eg, NAS) of the terminal may trigger a new NAS procedure for transitioning from the light connection state to the RRC connection state. .
When initiating the above-described NAS procedure (one of a service request procedure, an attach procedure, a TAU procedure, and a new NAS procedure) from an upper layer, the UE may recognize that the RRC is in the light connection state, and thus the UE is in the RRC connection state in the light connection state. The transition to the furnace can be performed. For example, the above-described NAS procedure may be performed between the terminal and the core network entity. As another example, the above-described NAS procedure may not be performed between the terminal and the core network entity, and only a transition to the RRC connection state may occur, and then the RRC may respond to the NAS. For example, only the transition to the RRC connection state is performed, and the terminal does not need to transmit corresponding NAS signaling information (eg, a transition indication to the light connection state) through the base station to the core network.
2) A method of defining and indicating information for indicating a write connection in an RRC Connection Reconfiguration message.
When the base station recognizes that the terminal supports the write connection, the base station may define information for indicating the write connection in the RRC connection reconfiguration message and indicate it to the terminal.
Upon receiving the RRC connection reconfiguration message indicating the right connection, the UE may perform an operation for the right connection state.
The terminal operation for the write connection state indicates that one or more of the following operations are performed.
Terminal context storage
-Stores the terminal information on the light connection status
Perform some or all of the operations of the RRC IDLE terminal (eg, one or more of cell reselection, paging, and suspend of radio resources);
On the other hand, the base station may include additional configuration information for instructing the terminal further detailed operation in the light connection state.
If the terminal receives the RRC Connection Reconfiguration message indicating the write connection state and suspends radio resources according to the indication information, the terminal cannot transmit the RRC Connection Reconfiguration Complete message to the base station. For example, if the SRB for delivering the RRC message is suspend, the RRC signaling cannot be delivered. Alternatively, if the MAC is reset or if the radio configuration information of the cell is suspend, the RRC connection reconfiguration confirmation message cannot be delivered to the base station.
2-1) RRC Connection Reconfiguration Directing Light Connection Reconstruction check for messages An embodiment that does not send a message
For example, the terminal that has received the RRC connection reconfiguration message including information for indicating the right connection may not transmit the RRC connection reconfiguration confirmation message to the base station.
2-2) light Connection An embodiment of sending a reconfiguration confirmation message and transitioning to a light connection upon receiving an indicating RRC connection reconfiguration message
For example, the terminal that receives the RRC connection reconfiguration message including information for indicating the light connection may first respond to the RRC connection reconfiguration confirmation message to the base station and then apply the light connection.
2-3) An embodiment of transition to the light connection through a new RRC connection configuration message that is distinct from the RRC connection reconfiguration message
For example, the information for indicating the write connection may be received through a downlink RRC message distinguished from the RRC connection reconfiguration message. This downlink RRC message may be defined as a message that does not require a success or confirmation message. The terminal may enter the light connection state by receiving this downlink message.
The terminal does not need to deliver an acknowledgment or failure message for this downlink RRC message to the base station.
2-4) An embodiment of supporting some communication functions when receiving an RRC connection reconfiguration message indicating a light connection and applying the corresponding operation
For example, when a terminal receiving an RRC connection reconfiguration message including information for indicating a light connection transitions to a light connection state, a function for performing an operation for indicating an RRC connection reconfiguration confirmation message to a base station (for example, , L2 entity, MAC maintenance) can be maintained until a certain time or until a certain criterion is satisfied.
2-5) Receive the RRC connection reconfiguration message indicating the light connection and set a timer to apply the operation. By connection Switching Example
For example, a terminal that receives an RRC connection reconfiguration message including information for indicating a light connection may operate a timer for transitioning to a light connection. When the terminal receives the RRC connection reconfiguration message including information for indicating the right connection, the terminal starts the timer. When the timer expires, it transitions to the light connection. The terminal may transmit an RRC connection reconfiguration confirmation message to the base station until the timer expires.
light connection Status terminal identification information
As described above, the terminal in the write connection state is not in the RRC connection state, and thus does not perform the handover operation. Accordingly, the write connection state terminal may perform a cell reselection operation according to the movement of the terminal.
To this end, even when the light connection state terminal moves, it must be able to identify the terminal in the network. In addition, when the terminal moves, in order to query / fetch / interrogate a terminal context for the terminal and process the terminal, the base station identification information and / or cell identification information configured to the light connection state may be required.
In order to effectively perform the state transition and data transmission for the terminal, the following information may be used individually or in combination with the light connection state terminal identification information.
One) Core Save terminal identification information as terminal identification information
The terminal identification information of the core network includes a core network entity code and identification information temporarily assigned by the core network entity. Therefore, the terminal can be uniquely identified within the core network entity.
2) Cell identification information Wireless network temporary identification information as terminal identification information
If a cell in the network can be uniquely identified through the cell identification information, the terminal can be uniquely combined with the cell identification information and the wireless network temporary identification information temporarily assigned by the base station accommodating the cell.
3) Storing base station identification information and wireless network temporary identification information as terminal identification information
If the base station in the network can be uniquely identified through the base station identification information, the terminal can be uniquely combined with the base station identification information and the wireless network temporary identification information temporarily assigned by the base station.
4) Store CU identification information and wireless network temporary identification information as terminal identification information
If the CU in the network can be uniquely identified through the CU identification information, the terminal can be uniquely combined with the CU identification information and the wireless network temporary identification information temporarily allocated by the CU.
light connection State of terminal Uplink Data or Signaling Transmission way
The UE in the right connection state may transmit and receive data by performing a transition to the RRC connection state. To this end, when a transition to the RRC connected state is triggered, the terminal in the light connection state performs the transition operation to the RRC connected state.
For example, when there is uplink data or signaling in the UE in the light connection state (for MO data or MO signaling) or when the UE in the light connection state receives paging, the UE switches to the RRC connection state in the cell. (Alternatively, the RRC connection may be resumed or the transition to the RRC connection state may be described as a transition from the light connection state to the RRC connection state or the transition to the RRC connection state for convenience of explanation.)
Hereinafter, a detailed procedure for the UE to transition to the RRC connected state will be described by dividing the embodiment.
1) Using RRC Connection request message Example
The terminal may transmit the RRC Connection request message to the base station through a common control channel (eg, CCCH).
If the transition from the light connection state to the RRC connection state is triggered by the upper layer, and if the upper layer provided S-TMSI, a value received from the upper layer may be set as a terminal identifier (ue-Identity).
If a transition from the light connection state to the RRC connection state is triggered in the AS, it is possible to set a stored value received from the base station as the terminal identifier. This will be described later.
If the transition from the light connection state to the RRC connection state is triggered by the upper layer, a setting cause value corresponding to the information received from the upper layer may be set. The setting cause value may mean information about a trigger cause that causes a transition to the RRC connection state. As an example, the terminal may add information indicating a transition from the light connection state to the RRC connection state. As another example, the UE may add information indicating a transition from the light connection state to the RRC connection state to the RRC Connection setup complete message.
If the transition from the light connection state to the RRC connection state is triggered in the AS, a value indicating the transition from the light connection state to the RRC connection state can be set as a setting cause.
2) Using RRC Connection re-establishment Request message Example
The terminal may transmit the RRC Connection Reset Request message to the base station through a common control channel (eg, CCCH).
The terminal sets the C-RNTI used in the cell indicating the write connection state to c-RNTI.
The terminal sets the physical cell identifier in the cell indicating the write connection state to phyCellId.
The terminal sets the MAC-I to the calculated MAC-I 16 least significant bits.
The terminal may set a value indicating a redirection cause (reestablishmentsCause) from the light connection state to the RRC connection state.
As another example, if a transition from the light connection state to the RRC connection state is triggered in the AS, the terminal identifier may set a stored value received from the base station. This will be described later.
3) Using the RRC Connection resume Request message Example
The terminal may transmit an RRC Connection Resumption Request message to the base station through a common control channel (eg, CCCH).
The terminal identifier may set a stored value received from the base station. This will be described later.
If the transition from the light connection state to the RRC connection state is triggered by the higher layer, a value of establishmentcause corresponding to the information received from the upper layer may be set. The setting cause value may include cause information that triggers a transition to the RRC connection state. For example, the setting cause value may include information indicating any one of paging message reception, origination data trigger, or origination signaling trigger. As an example, the terminal may add information indicating a transition from the light connection state to the RRC connection state. As another example, the UE may add information indicating a transition from the write connection state to the RRC connection state to the RRC Connection resume complete message.
If a transition from the light connection state to the RRC connection state is triggered in the AS, a value indicating the transition from the light connection state to the connected state can be set as a setting cause.
The terminal sets the MAC-I to the calculated MAC-I 16 least significant bits.
4) Embodiment using a new RRC Connection request message using a common control channel
The terminal may transmit a new RRC Connection request message to the base station through a common control channel (eg, CCCH).
The terminal identifier may set a stored value received from the base station. This will be described later.
If a transition from the light connection state to the RRC connection state is triggered by the higher layer, a setting cause value corresponding to the information received from the upper layer may be set. As an example, the terminal may add information indicating a transition from the light connection state to the RRC connection state. As another example, the UE may add information indicating a transition from the write connection state to the RRC connection state in the RRC Connection resume complete message.
If a transition from the light connection state to the RRC connection state is triggered in the AS, a value indicating the light connection transition may be set as a setting cause.
The terminal sets the MAC-I to the calculated MAC-I 16 least significant bits.
As described above, the embodiments can take less processing effort for the terminal performing frequent connection setup and can make more capacity available to the network node. In addition, there is an effect that can also reduce the battery consumption of the terminal.
Hereinafter, the configuration of a terminal and a base station capable of performing some or all of the embodiments described with reference to FIGS. 1 to 5 will be described with reference to the drawings.
6 is a diagram illustrating a terminal configuration according to another embodiment.
Referring to FIG. 6, the terminal 600 for changing the connection state changes the state from the base station to the light connection state and the
For example, the
For example, the terminal capability information may be delivered to the base station or the core network through the AS capability or the NAS capability. As another example, the terminal capability information may be included in the terminal radio access capability or the terminal core network capability. The
The light connection state means a state in which a connection state between a base station and a core network for a terminal is maintained, but all signaling radio bearers (SRBs) and data radio bearers (DRBs) of the terminal are suspended. That is, the write connection state may mean a state in which the RRC and ECM states are inconsistent.
In addition, the
The
The
In addition, when the terminal in the light connection state moves, the
In addition, the
7 is a diagram illustrating a configuration of a base station according to another embodiment.
Referring to FIG. 7, the
The
For example, the terminal capability information may be delivered to the base station or the core network through the AS capability or the NAS capability. As another example, the terminal capability information may be included in the terminal radio access capability or the terminal core network capability. The
The
When the terminal transitions to the write connection state, the
Meanwhile, the receiving
In addition, the
In addition, the
The standard contents or standard documents mentioned in the above embodiments are omitted to simplify the description of the specification and form a part of the present specification. Therefore, the addition of the contents of the standard and part of the standard documents to the specification or the description in the claims should be interpreted as falling within the scope of the present invention.
The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.
Claims (24)
Transmitting terminal capability information indicating that the terminal supports the light connection to the base station;
Receiving a radio resource control (RRC) message including indication information indicating a state change from the base station to a light connection state; And
And performing an operation of changing the connection state of the terminal from the RRC connection state to the light connection state based on the indication information.
RRC message including the indication information,
RRC disconnection message,
The method may further include transmitting an RRC connection resumption request message to the base station requesting to change the connection state of the terminal from the light connection state to the RRC connection state.
The performing of the operation of changing to the light connection state may include:
Stop the Signaling Radio Bearer (SRB) and Data Radio Bearer (DRB) of the terminal, but stores the terminal context,
Instructs the termination of the RRC connection state to a higher layer;
The step of transmitting the RRC connection resumption request message to the base station,
Set a setting cause value corresponding to the information received from the upper layer or the AS layer, set the MAC-I value to the 16 least significant bits of the calculated MAC-I, and include the setting cause value in the RRC connection resume request message. To send,
The terminal in the light connection state,
Identified by the light connection state terminal identification information,
The light connection state terminal identification information,
And a base station identification information configured to configure the terminal in the light connection state and a wireless network temporary identification information temporarily allocated by the base station.
The light connection state is,
The connection state between the base station and the core network for the terminal is maintained, characterized in that all the signaling radio bearer (SRB) and data radio bearer (DRB) of the terminal is in a suspended state (suspend).
The state change to the RRC connected state,
And triggered by any one of a paging message reception, an origination data trigger, and an origination signaling trigger.
Receiving, from the terminal, terminal capability information indicating that the terminal supports a light connection state;
Transmitting a Radio Resource Control (RRC) message including indication information indicating a state change to a light connection state to the terminal; And
Changing the connection state with the terminal from the RRC connection state to the light connection state;
The light connection state is,
The connection state between the base station and the core network for the terminal is maintained, but all signaling radio bearers (SRBs) and data radio bearers (DRBs) of the terminal are suspended.
RRC message including the indication information,
RRC disconnection message,
Receiving an RRC connection resumption request message requesting a state change from the light connection state to the RRC connection state from the terminal,
The step of changing to the light connection state,
Save the terminal context of the terminal, but stop all SRB and DRB with the terminal,
The terminal,
When the indication information is received, instructs to stop the RRC connection state to a higher layer,
When a state change from the light connection state to the RRC connection state is triggered,
Set a setting cause value corresponding to the information received from the upper layer or the AS layer, set the MAC-I value to the 16 least significant bits of the calculated MAC-I, and include the setting cause value in the RRC connection resume request message. To send,
The terminal in the light connection state,
Identified by the light connection state terminal identification information,
The light connection state terminal identification information,
And a base station identification information configured to configure the terminal in the light connection state and a wireless network temporary identification information temporarily allocated by the base station.
A transmitter for transmitting terminal capability information indicating to support a light connection to a base station;
A receiver configured to receive a radio resource control (RRC) message including indication information indicating a state change from the base station to a light connection state; And
And a controller configured to change the connection state of the terminal from the RRC connection state to the light connection state based on the indication information.
RRC message including the indication information,
RRC disconnection message,
The transmitting unit,
Further transmitting to the base station an RRC connection resume request message requesting to change the connection state of the terminal from the light connection state to the RRC connection state,
The control unit,
Stop the Signaling Radio Bearer (SRB) and Data Radio Bearer (DRB) of the terminal, and stores the terminal context,
Instructing an upper layer to stop the RRC connection state and performing an operation of changing to the light connection state;
The control unit,
When a change request for changing the connection state of the terminal from the light connection state to the RRC connection state is triggered, a setting cause value corresponding to the information received from the higher layer or the AS layer is set, and the MAC-I value is calculated. Set to 16 least significant bits of MAC-I,
The transmitter, including the set cause value in the RRC connection resumption request message and transmits,
The terminal in the light connection state,
Identified by the light connection state terminal identification information,
The light connection state terminal identification information,
And a base station identification information configured to configure the terminal in the light connection state and a wireless network temporary identification information temporarily allocated by the base station.
The light connection state is,
The connection state between the base station and the core network to the terminal is maintained, all of the signaling radio bearer (SRB) and data radio bearer (DRB) of the terminal characterized in that the suspended state (suspend).
The state change to the RRC connected state,
A terminal characterized in that triggered by the operation of any one of paging message reception, outgoing data trigger, and outgoing signaling trigger.
A receiver configured to receive terminal capability information indicating that the terminal supports a light connection state from the terminal;
A transmitter for transmitting a radio resource control (RRC) message including indication information indicating a state change to a light connection state to the terminal; And
It includes a control unit for changing the connection state with the terminal from the RRC connection state to the light connection state,
The light connection state is,
The connection state between the base station and the core network for the terminal is maintained, but all signaling radio bearers (SRBs) and data radio bearers (DRBs) of the terminal are suspended.
RRC message including the indication information,
RRC disconnection message,
The receiving unit,
Further receiving an RRC connection resumption request message for requesting a state change from the light connection state to the RRC connection state from the terminal,
The control unit,
Save the terminal context of the terminal, but stop all SRB and DRB with the terminal,
The terminal,
When the indication information is received, instructs to stop the RRC connection state to a higher layer,
When a state change from the light connection state to the RRC connection state is triggered,
Set a setting cause value corresponding to the information received from the upper layer or the AS layer, set the MAC-I value to the 16 least significant bits of the calculated MAC-I, and include the setting cause value in the RRC connection resume request message. To send,
The terminal in the light connection state,
Identified by the light connection state terminal identification information,
The light connection state terminal identification information,
And a base station identification information configured to configure the terminal in the light connection state and a wireless network temporary identification information temporarily allocated by the base station.
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| CN201710282167.5A CN107360561B (en) | 2016-05-03 | 2017-04-26 | Method for changing connection state and apparatus therefor |
| US15/498,607 US10420067B2 (en) | 2016-05-03 | 2017-04-27 | Method of changing connection state and apparatus therefor |
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| CN110612777A (en) * | 2018-04-02 | 2019-12-24 | Oppo广东移动通信有限公司 | RRC state control method and device and computer storage medium |
| EP3726923A1 (en) * | 2019-03-28 | 2020-10-21 | LG Electronics Inc. | Operation method of sidelink tx ue for transmitting rrc message related to rlf after rrc resumption in wireless communication system |
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| 3gpp R2-162885 |
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