Network controlled repeater, base station and method

Abstract

The present disclosure relates to a network controlled repeater for a mobile telecommunications network, where the network controlled repeater comprises circuitry configured to: detect a radio link failure in a connection between the network controlled repeater and a cell provided by a base station of the mobile telecommunications network; and releasing a first configuration of a forwarding function of the network-controlled repeater based on the detected radio link failure.

Description

Technical Field

[0001] The present disclosure generally relates to network controlled repeaters, base stations and methods. Background Art

[0002] Several generations of mobile telecommunication systems are known, e.g. the third generation (3G) based on the International Mobile Telecommunications 2000 (IMT-2000) specifications, the fourth generation (4G) providing capabilities defined in the International Mobile Telecommunications Advanced standard (IMT-Advanced standard), and the fifth generation (5G) which has recently been put into practice and is still under further development.

[0003] The wireless communication technology required to provide 5G is called New Radio (NR) access technology. A certain aspect of NR is based on Long Term Evolution (LTE) technology, which is a wireless communication technology that allows mobile phones and data terminals to communicate at high speeds and is already used in 4G mobile telecommunications systems. LTE and NR are standardized under the control of 3GPP (3rd Generation Partnership Project).

[0004] In addition, a new research project on network-controlled repeaters for 5G, also known as smart repeaters, was agreed upon.

[0005] While the technology exists for network controlled repeaters, it is generally desirable to provide improved technology for network controlled repeaters. Summary of the invention

[0006] According to a first aspect, the present disclosure provides a network-controlled repeater for a mobile telecommunications network, wherein the network-controlled repeater comprises a circuit configured to perform the following steps: detecting a radio link failure in a connection between the network-controlled repeater and a cell provided by a base station of the mobile telecommunications network; and based on the detected radio link failure, releasing a first configuration of a forwarding function of the network-controlled repeater.

[0007] According to a second aspect, the present disclosure provides a base station for a mobile telecommunication network, wherein the base station comprises a circuit configured to: detect a radio link failure in a connection between a network-controlled repeater of the mobile telecommunication network and a cell provided by the base station; and based on the detected radio link failure, release a first configuration of a forwarding function of the network-controlled repeater.

[0008] According to a third aspect, the present disclosure provides a method for a mobile telecommunication network, wherein the mobile telecommunication network comprises a network-controlled repeater and a base station; wherein the method comprises detecting a radio link failure in a connection between the network-controlled repeater and a cell provided by the base station; and based on the detected radio link failure, releasing a first configuration of a forwarding function of the network-controlled repeater.

[0009] According to a fourth aspect, the present disclosure provides a network-controlled repeater for a mobile telecommunications network, wherein the network-controlled repeater comprises a circuit configured to perform the following steps: detecting a radio link failure in a connection between the network-controlled repeater and a cell provided by a base station of the mobile telecommunications network; and sending a connection re-establishment request message to the base station, the connection re-establishment request message including an indication of the radio link failure of the network-controlled repeater as a re-establishment cause.

[0010] According to a fifth aspect, the present disclosure provides a user equipment for a mobile telecommunication network, wherein the user equipment comprises a circuit configured to perform the following steps: detecting a radio link failure in a connection between the user equipment and a cell provided by a base station of the mobile telecommunication network; and sending a connection re-establishment request message to the base station, the connection re-establishment request message comprising an indication of the radio link failure of the user equipment as a re-establishment cause.

[0011] According to a sixth aspect, the present disclosure provides a base station for a mobile telecommunication network, wherein the base station comprises a circuit configured to perform the following steps: detecting a radio link failure in a connection between a network entity of the mobile telecommunication network and a cell provided by the base station; and receiving a connection re-establishment request message from the network entity, the connection re-establishment request message comprising an indication of a radio link failure of the network entity as a re-establishment cause.

[0012] According to a seventh aspect, the present disclosure provides a method for a mobile telecommunication network, wherein the mobile telecommunication network comprises a base station and a network entity; wherein the method comprises: detecting a radio link failure in a connection between the network entity and a cell provided by the base station; and sending a connection re-establishment request message from the network entity to the base station, the connection re-establishment request message comprising an indication of a radio link failure of the network entity as a re-establishment cause.

[0013] Further aspects are set out in the dependent claims, the drawings and the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Embodiments are explained by way of example with reference to the accompanying drawings, in which:

[0015] Figure 1 shows a network controlled relay connected to a gNB and a user equipment according to an embodiment;

[0016] Figure 2 A first method of a mobile telecommunication system according to an embodiment is shown;

[0017] Figure 3 A second method of a mobile telecommunication system according to an embodiment is shown;

[0018] Figure 4 A third method of a mobile telecommunication system according to an embodiment is shown;

[0019] Figure 5 A fourth method of a mobile telecommunication system according to an embodiment is shown;

[0020] Figure 6 A fifth method of a mobile telecommunication system according to an embodiment is shown;

[0021] Figure 7 A sixth method of a mobile telecommunication system according to an embodiment is shown;

[0022] Figure 8 shows a user equipment, a network controlled relay and a base station according to an embodiment; and

[0023] Fig. 9 A general purpose computer according to an embodiment is shown. DETAILED DESCRIPTION

[0024] In giving reference Figure 2 Before describing in detail the embodiments of the present invention, an overall explanation is given.

[0025] As mentioned at the beginning, a new research project on Network Controlled Repeaters (NCR; also called Smart Repeaters) for 5G was agreed upon. The research project has the following objectives:

[0026] “The study of NR network-controlled repeaters will focus on the following scenarios and assumptions:

[0027] - Network controlled repeaters are in-band RF repeaters used for extension of network coverage in both FR1 and FR2 bands, while during the study, FR2 deployments were preferred for both outdoor and O2I scenarios.

[0028] - For repeaters controlled by a single-hop fixed network only

[0029] - Network controlled relays are transparent to UE

[0030] - Network-controlled relays can maintain both gNB-relay links and relay-UE links

[0031] Note 1: Cost effectiveness is a key consideration for network-controlled repeaters.

[0032] Investigate and confirm which of the following auxiliary control information is necessary for network controlled repeaters, including assumptions about maximum transmit power [RAN1]

[0033] -Beamforming information

[0034] - Timing information used to align transmit / receive boundaries of network controlled repeaters

[0035] - Information about UL-DL TDD configuration

[0036] -ON-OFF information for efficient interference management and improved energy efficiency

[0037] -Power control information for efficient interference management (as a second priority)

[0038] Study and confirm L1 / L2 signalling (including its configuration) for carrying auxiliary control information [RAN1]

[0039] Study the following aspects of network controlled repeater management

[0040] -Confirmation and authorization of network controlled repeaters [RAN2, RAN3]

[0041] NOTE 2: Coordination with SA3 may be required.”

[0042] Figure 1 FIG. 4 shows an NCR connected to a gNB and a user equipment according to an embodiment. In some embodiments, as Figure 1 As shown in FIG, a network controlled repeater (NCR) 1 is divided into an NCR mobile terminal (NCR-MT) function 2 and an NCR forwarding (NCR-Fwd) function 3. The NCR-MT 2 can be configured with beam configuration, time division duplex (TDD) configuration, power control (if agreement is reached) and on / off configuration, and the configuration is used for the NCR-Fwd link.

[0043] NCR 1 is connected to gNB 4 (which is a New Radio (NR) base station) and user equipment (UE) 5. NCR-MT 2 is connected to gNB 4 via a control link 6. NCR-Fwd 3 is connected to gNB 4 via a backhaul link 7 and to UE 5 via an access link 8.

[0044] NCR-Fwd 3 forwards the connection between gNB 4 and UE 5 via backhaul link 7 and access link 8. NCR-MT 2 receives the configuration of NCR-Fwd 3 via control link 6. For example, the configuration of NCR-Fwd 3 may include the beam configuration, TDD configuration, power control, and on / off configuration mentioned above.

[0045] That is, although the configuration mentioned above is used for access link 8, it is received from gNB 4 via control link 6 (using radio resource control (RRC) or other signaling) in the NCR-MT 2 function.

[0046] In some embodiments, the NCR access link 8 may always relay a common beam for all UEs 5 connected to the NCR 1 .

[0047] It is recognized that the NCR may suffer from a radio link failure (RLF) in its connection with the gNB, and it is necessary to specify how the NCR recovers from the RLF.

[0048] In some instances where the NCR-MT suffers RLF while the NCR is serving UEs over an access link, all UEs on the NCR access link will also suffer RLF, as the cell to which the NCR is connected will simply disappear and uplink / downlink (UL / DL) transmission / reception (tx / rx) will no longer be possible. The NCR-MT may declare RLF, perform cell selection and perform a re-establishment procedure with the cell (or a new cell) based on the existing RLF procedure. All UEs served by the NCR may also suffer RLF, perform cell selection and perform a re-establishment procedure.

[0049] There are two cases for reestablishing NCR-MT: NCR reestablishes on an earlier serving cell (temporary RLF) or on another cell. If NCR reestablishes on the same cell where it resided before RLF, the reestablishment performed by the UE served by NCR when the access link RLF is detected may be unnecessary and may bring signaling bursts when all UEs start to perform the reestablishment process.

[0050] In some instances, there is no need to expedite the re-establishment of these UEs under the NCR. These UEs are most likely to return to the same cell and the same NCR. In addition, if the re-establishment request from the NCR-MT and from these UEs includes the same cell id as the previous cell id in the UE context, then no security change may be required.

[0051] The current re-establishment procedure is specified in 3GPP Technical Specification (TS) 38.331 Version 16.8.0 dated March 2022:

[0052] “The purpose of this procedure is to re-establish an RRC connection. A UE in RRC_CONNECTED (set up with SRB2 and at least one DRB or with AS security activated for IAB, SRB2) may initiate this procedure in order to continue an RRC connection. Connection re-establishment is successful if the network is able to find and verify a valid UE context, or if no UE context can be retrieved and the network responds with RRCSetup as per clause 5.3.3.4.

[0053] The network application process is as follows:

[0054] - When AS security is activated and the network retrieves or verifies the UE context:

[0055] - Reactivate AS security without changing the algorithm;

[0056] - Re-establish and restore SRB1;

[0057] - When the UE is re-establishing an RRC connection and the network is unable to retrieve or verify the UE context:

[0058] - discard the stored AS context and release all RB and BH RLC channels;

[0059] - Fall back to establish a new RRC connection.

[0060] If AS security has not been activated, the UE shall not initiate this procedure but instead moves directly to RRC_IDLE with release cause "other". If AS security is activated but SRB2 and at least one DRB or, for IAB, SRB2 are not established, the UE shall not initiate this procedure but instead moves directly to RRC_IDLE with release cause "RRC connection failure".

[0061] Therefore, the current re-establishment procedure does not cover the NCR, and further, there is room for improvement in failure handling of UEs connected to the NCR.

[0062] In some instances, the NCR-MT may be identified as an Integrated Access and Backhaul (IAB)-MT, and the process may be as follows:

[0063] The NCR-MT may be allowed to initiate a re-establishment procedure without a Data Radio Bearer (DRB), i.e., if Access Stratum (AS) security is activated, then Signaling Radio Bearer 2 (SRB2) may be sufficient. If SRB2 is not established but AS security is established, the NCR-MT may move to IDLE mode. If AS security is not established, the NCR-MT may move to IDLE mode. This may be the same as for IAB-MT.

[0064] As mentioned, the RLF processing at NCR-MT can be shown to be similar to IAB-MT, but there are some differences. IAB supports multi-hop, and routing is implemented in the Backhaul Adaptation Protocol (BAP) layer. NCR supports only single hop, and routing is done in the physical layer at NCR.

[0065] Therefore, when RLF occurs, the physical layer configuration of the NCR should be released so that the NCR is ready to accept the new configuration. In addition, the RLF processing at the NCR can be optimized so that the power outage of the UE on the access link of the NCR can be avoided or minimized.

[0066] Therefore, in some embodiments, when initiating the RLF procedure and before sending the re-establishment request message, the NCR-MT may (this is necessary for NCR operation and may be a new aspect) release the beam configuration, on / off configuration and TDD configuration so that the NCR-MT can accept the new configuration from the new cell. This may allow the gNB to release the NCR configuration after a certain period of time. This period of time may be equal to the duration of the RLF timer for a specific NCR-MT or gNB implementation.

[0067] Accordingly, some embodiments relate to a network controlled repeater (NCR) for a mobile telecommunications network, wherein the network controlled repeater comprises a circuit configured to: detect a radio link failure (RLF) in a connection between the network controlled repeater and a cell provided by a base station of the mobile telecommunications network; and based on the detected RLF, release a first configuration of a forwarding function of the network controlled repeater.

[0068] The mobile telecommunication network may be based on 5G and new radio (NR). The base station may include a 5G gNB and may provide a cell according to 5G. For example, the cell may include an NR cell. In some embodiments, the base station may provide multiple NR cells.

[0069] As discussed above, the NCR may include an NCR-MT function connected to a base station via a control link. The NCR may also include an NCR-Fwd function connected to the base station via a backhaul link and connected to a user equipment (UE) via an access link. The NCR-Fwd function may include a forwarding function that forwards a connection between a base station and a UE according to a first configuration via a backhaul link and an access link. Thus, the first configuration may be a configuration of the forwarding function of the NCR-Fwd. The NCR-MT function may include receiving a first configuration of the forwarding function from a base station via a control link, for example based on radio resource control (RRC) or similar signaling.

[0070] The NCR-Fwd function may be connected to a plurality of UEs, and the forwarding function may include forwarding a connection between the base station and each of the plurality of UEs.

[0071] The NCR may detect RLF if its RRC receives a predetermined number of out-of-sync (OOS) indications from the physical layer and then a predetermined duration of the NCR's RLF timer expires before synchronization is restored. Alternatively, the NCR may detect RLF based on a received signal strength indicator (RSSI), received signal received power (RSRP), and / or received signal received quality (RSRQ) and an RLF timer. For example, the NCR may detect RLF if RSSI, RSRP, and / or RSRQ drop below a predetermined threshold for a predetermined duration indicated by the RLF timer.

[0072] The NCR may release the first configuration in response to detecting the RLF, for example, before performing cell selection or before sending a connection reestablishment request message or a connection establishment request message to the selected cell selected in the cell selection. The release may include marking the first configuration as deleted, overwritten, or reused based on signaling (e.g., RRC signaling) received from the selected cell. For example, the release may include setting a release flag indicating that the first configuration is released.

[0073] For example, a serving cell may support configuration via OAM (Operations, Administration, and Maintenance; same vendor), but may select another cell after RLF and cell selection, and that other cell may indicate via RRC signaling a second configuration of NCR-Fwd that is different from the first configuration. Therefore, in some embodiments, it is important that the NCR-MT releases the previous (first) configuration. In some embodiments, a base station (such as a gNB) cannot maintain UE or NCR-MT contexts forever. For example, if the NCR suffers a power outage that lasts for several hours, it may not make sense for the gNB to maintain the NCR-MT context because all connected UEs may have moved elsewhere. Alternatively, the NCR-MT may maintain the NCR-MT and NCR-Fwd configurations in the hope that the old serving cell and the new serving cell may be the same or may be provided by the same base station.

[0074] In some embodiments, releasing the first configuration includes: deleting the first configuration. For example, if the selected cell is not the same cell as the cell provided by the base station whose connection has been detected RLF interrupted, or if the selected cell is not provided by the (same) base station, the NCR may delete the first configuration. For example, if the base station providing the selected cell provides the NCR with a second configuration of the forwarding function, or if the base station providing the selected cell does not indicate to the NCR to reuse the first configuration, the NCR may delete the first configuration. Therefore, the NCR may delete the first configuration during or after RRC signaling with the base station providing the selected cell.

[0075] In some embodiments, the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0076] The beam configuration may indicate a beam used for communication in a backhaul link and / or in an access link. For example, the beam configuration may indicate a beam index, a frequency range of a beam, and / or a timing of a beam. When an intelligent reflecting surface (IRS) is used, the beam configuration may control the reflection amplitude and / or phase shift of the IRS.

[0077] The on / off configuration may indicate the on / off state of the NCR. For example, the on / off configuration may indicate the on / off mode of the NCR, the cycle of the on / off state, the schedule of the on / off state, and / or the on / off state of the currently requested NCR.

[0078] The time division multiplexing configuration may indicate different time periods for uplink (UL) and downlink (DL) transmissions via a backhaul link and / or an access link. For example, the time division multiplexing configuration may indicate a period, mode or schedule of UL / DL transmissions of time division duplex (TDD) and TDD.

[0079] In some embodiments, the circuit is configured to release the first configuration to accept a second configuration of the forwarding function. The NCR may release the first configuration that was the basis of the connection before the RLF occurred because the NCR cannot know whether the first configuration will be reused after reestablishing the connection with the base station, or whether a second configuration different from the first configuration will be used to reestablish the connection.

[0080] In some embodiments, the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. The second configuration may replace the first configuration for reestablishing a connection with the base station. Thus, the second configuration may configure aspects of the connection with the base station similar to the first configuration (e.g., beam, on / off, and / or time division multiplexing). For example, the second configuration may configure a different value or option from the first configuration for at least one aspect of the connection with the base station.

[0081] In some embodiments, the circuit is further configured to perform cell selection in response to the detected RLF; and determine that the cell selected in the cell selection is provided by the base station. For example, the determination may include that the selected cell is the same cell as the cell whose connection has been interrupted by the RLF. For example, the determination may include that the selected cell is another cell other than the cell whose connection has been interrupted by the RLF, but the selected cell is also provided by the (same) base station.

[0082] For example, the cell selection may be based on RSSI, RSRP and / or RSRQ of one or more cells received by the NCR. The cell selection may also be based on the mobile network operator, radio access technology, state, cell identifier, frequency range and / or maximum possible data rate of one or more cells. For example, the NCR may preferably select a cell that has been disconnected by RLF or a cell provided by a base station that has been disconnected by RLF.

[0083] For example, if the selected cell is the same cell whose connection has been interrupted by RLF, the base station may retrieve a first configuration and / or context associated with the NCR and / or associated with a UE connected to the base station via the NCR. Similarly, if the selected cell is another cell other than the cell whose connection has been interrupted by RLF but provided by the same base station, the base station may internally coordinate contexts associated with the NCR and / or associated with a UE connected to the base station via the NCR so that the base station may retrieve a first configuration and / or context associated with the NCR and / or associated with a UE connected to the base station via the NCR.

[0084] For example, in cell selection, the NCR may be provided with a list of cells where the NCR may expect to reuse a previous configuration and / or accelerate re-establishment, e.g., because the cells may be provided by a base station. For example, the list may be shared in a security protection message to establish trust later. The NCR may preferably select a cell from the list.

[0085] In some embodiments, the determination is based on a cell identifier of the selected cell. For example, the determination may include determining that the cell identifier of the selected cell is equal to the cell identifier of the cell whose connection has been interrupted by RLF. For example, the determination may include determining that the cell identifier of the selected cell is associated with the (same) base station. The cell identifier may include a CellIdentity included in minimum system information (MSI) (e.g., system information block 1 (SIB1)) and may be unique.

[0086] In some implementations, the circuit is further configured to send a connection reestablishment request message to the base station. The connection reestablishment request message may include an RRCReestablishmentRequest message.

[0087] In some embodiments, the circuit is further configured to receive a second configuration from the base station. For example, the NCR may receive the second configuration when connected to the selected cell. For example, the NCR may receive the second configuration via RRC signaling.

[0088] In some embodiments, the circuit is further configured to request the second configuration from the base station. For example, the NCR may request the second configuration via RRC signaling. However, in some embodiments, the NCR may not send a request for the second configuration to the base station, and the base station may determine to send the second configuration to the NCR without receiving a request for the second configuration, and may send the second configuration to the NCR after receiving a connection reestablishment request message or a connection reestablishment completion message.

[0089] In some embodiments, the request includes sending a request for the second configuration in a connection re-establishment request message. For example, the request may be indicated by a bit set by the NCR in the connection re-establishment request message or by a value included by the NCR in the connection re-establishment request message.

[0090] In some embodiments, the request includes sending a request for the second configuration in a connection reestablishment complete message. The connection reestablishment complete message may include an RRCReestablishmentComplete message. For example, the request may be indicated by a bit set by the NCR in the connection reestablishment complete message or a value inserted by the NCR into the connection reestablishment complete message.

[0091] In some embodiments, the receiving includes: receiving the second configuration in a connection reestablishment message. The connection reestablishment message may include an RRCReestablishment message received from a base station for connecting to the selected cell. For example, the NCR may be configured to extract the second configuration from the connection reestablishment message.

[0092] In some embodiments, the receiving includes: receiving the second configuration in a connection reconfiguration message. The connection reconfiguration message may include an RRCReconfiguration message received from a base station for connecting to the selected cell. For example, the NCR may be configured to extract the second configuration from the connection reconfiguration message.

[0093] In some embodiments, the connection re-establishment request message includes an indication of the RLF of the NCR as the re-establishment cause. The re-establishment cause may include ReestablishmentCause. The indication may include a value associated with the RLF in the NCR (e.g., in the NCR-MT). This can be indicated by using an existing cause value or a new cause value. For example, in addition to the re-establishment causes "reconfigurationFailure", "handoverFailure", "otherFailure", and "spare1" defined for the conventional 5G RRC re-establishment request message, a new re-establishment cause value may be defined, which may indicate to the base station that the connection re-establishment request message is from the NCR. The new re-establishment cause value may also indicate that the selected cell to which the connection re-establishment request message is sent is the same cell as the previous cell where the connection has been interrupted by RLF, and that the NCR is ready to reuse the first configuration.

[0094] For example, fast recovery may be useful for situations where a rapid change in radio conditions has triggered an RLF. In this case, the NCR-MT may indicate to the base station (e.g., to the gNB) that it is able to recover quickly by including an indication of RLF as the re-establishment cause.

[0095] In some embodiments, the circuit is further configured to receive a connection re-establishment message from the base station; and determine whether the connection re-establishment message includes a reuse indication for continuing to provide the forwarding function based on the first configuration.

[0096] The connection re-establishment message may include an RRCReestablishment message.The reuse indication may include a bit or value associated with an instruction to reuse the first configuration to re-establish a connection with the base station.

[0097] In some embodiments, the circuit is further configured to continue to provide the forwarding function based on the first configuration if the connection re-establishment message includes a reuse indication.

[0098] For example, if the NCR detects a reuse indication in the connection re-establishment message, the NCR may configure the NCR-Fwd function according to the first configuration that was previously released.

[0099] For example, after receiving a connection reestablishment message including a reuse indication, the NCR may respond to the base station with a connection reestablishment complete message (e.g., including an RRCReestablishmentComplete message) and may stop expecting connection reconfiguration messages (e.g., RRCReconfiguration messages) from the base station.

[0100] For example, after receiving a connection reestablishment message including a reuse indication, the NCR may respond to the base station with a connection reconfiguration complete message (eg, an RRCReconfigurationComplete message) indicating that the NCR does not expect to receive a connection reconfiguration message (eg, an RRCReconfiguration message).

[0101] For example, in response to a connection reconfiguration message (e.g., an RRCReconfiguration message) received after a connection reestablishment message including a reuse indication, the NCR may respond to the base station with a connection reconfiguration complete message (e.g., an RRCReconfigurationComplete message) without extracting configuration information from the connection reconfiguration message (i.e., the connection reconfiguration message may be a "dummy" reconfiguration message) or at least without extracting any configuration information related to the configuration of the NCR-Fwd function from the connection reconfiguration message.

[0102] In some embodiments, the circuit is further configured to receive the second configuration if the connection re-establishment message does not include a reuse indication. For example, in response to detecting that the connection re-establishment message does not include a reuse indication, the NCR may extract configuration information indicating the second configuration from the connection re-establishment message and / or from a subsequently received connection reconfiguration message (e.g., an RRCReconfiguration message).

[0103] In some embodiments, the circuit is further configured to receive a connection reconfiguration message from the base station in response to the connection reestablishment request message, instead of the connection reestablishment message. The connection reconfiguration message may include an RRCReconfiguration message following the connection reestablishment request, instead of the RRCReestablishment message. For example, omitting the connection reestablishment message (e.g., the RRCReestablishment message) may speed up recovery from RLF so that the forwarding function of the NCR-Fwd can be available again more quickly.

[0104] In some embodiments, the circuit is further configured to trust the base station; and after resuming the provision of the forwarding function, perform other security processes. For example, in order to make the forwarding function of the NCR-Fwd available again more quickly, the mutual verification and / or authentication of the NCR and the base station can be postponed from the connection re-establishment signaling to the time when the forwarding function of the NCR-Fwd has been restored. In the event of a failure of the postponed mutual verification and / or authentication, the NCR and / or the base station can stop trusting the corresponding other, respectively, the NCR can enter an idle state (e.g., RRC_IDLE) and / or the base station can release the connection (e.g., based on an RRCRelease message).

[0105] In some implementations, the detection of RLF is based on the RLF timer of the NCR. For example, if the RRC of the NCR receives an out-of-sync (OOS) indication from the physical layer and then a predetermined duration of the RLF timer expires, the NCR may detect the RLF. For example, if the NCR does not receive a message from the base station within a predetermined duration indicated by the RLF timer, or if the RSSI, RSRP, and / or RSRQ are less than a predetermined threshold within a predetermined duration indicated by the RLF timer, the NCR may detect the RLF.

[0106] In some embodiments, the RLF timer of the NCR is configured to indicate RLF after a shorter duration than the RLF timer of a UE connected to the NCR via the forwarding function.

[0107] For example, the duration of the RLF timer of the NCR for detecting RLF can be configured so that the NCR can perform cell selection, connection reestablishment and connection reconfiguration and restore the forwarding function of the NCR-Fwd after detecting the RLF, so that the user equipment (UE) connected to the base station via the NCR cannot detect the RLF at all during the above duration.

[0108] For example, in order to avoid all UEs under the NCR from performing re-establishment, the RLF timer of the NCR-MT may be smaller than that for normal UEs, so that the NCR declares RLF before the UE. If the NCR selects the same cell as before the RLF, RLF can be avoided for multiple UEs. On the other hand, in some embodiments, a too short duration of the RLF timer of the NCR may result in frequent RLF. Therefore, the duration of the RLF timer in the NCR may need to be balanced, but the duration may be shorter than the RLF timer of the UE connected to the base station via the NCR. In some embodiments, the RLF criteria of the NCR may include a more sensitive threshold for the value of the OOS indication from the physical layer to the RRC compared to the corresponding RLF criteria of the UE connected to the base station via the NCR. In some embodiments, this is a network-specific implementation and has no impact on 3GPP or other mobile telecommunications standard specifications.

[0109] Therefore, some embodiments relate to a base station for a mobile telecommunications network, wherein the base station includes a circuit configured to perform the following steps: detecting RLF in a connection between an NCR of the mobile telecommunications network and a cell provided by the base station; and based on the detected RLF, releasing a first configuration of a forwarding function of the NCR. In some embodiments, releasing the first configuration includes: deleting the first configuration. In some embodiments, the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. In some embodiments, releasing the first configuration is based on a release timer of the base station. In some embodiments, the release timer is configured to indicate that the first configuration is released after a time period corresponding to the duration of the RLF timer of the NCR. In some embodiments, the circuit is further configured to receive a connection re-establishment request message from the NCR. In some embodiments, the circuit is further configured to provide a second configuration of the forwarding function to the NCR. In some embodiments, the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. In some embodiments, the circuit is further configured to receive a request for the second configuration from the NCR. In some embodiments, the receiving includes receiving a request for the second configuration in a connection re-establishment request message. In some embodiments, the receiving includes receiving a request for a second configuration in a connection reestablishment complete message. In some embodiments, the providing includes sending the second configuration in a connection reestablishment message. In some embodiments, the providing includes sending the second configuration in a connection reconfiguration message. In some embodiments, the connection reestablishment request message includes an indication of RLF of the NCR as a reestablishment cause. In some embodiments, the circuit is further configured to send a reuse indication to the NCR in the connection reestablishment message for continuing to provide a forwarding function based on the first configuration. In some embodiments, the circuit is configured to send the reuse indication if the base station maintains a UE context of a UE connected to the NCR according to the first configuration. In some embodiments, the circuit is configured to send the reuse indication if the base station maintains an NCR mobile terminal context of the NCR according to the first configuration. In some embodiments, the circuit is configured not to send the reuse indication if the base station does not maintain a UE context of a UE connected to the NCR according to the first configuration. In some embodiments, the circuit is configured not to send the reuse indication if the base station does not maintain an NCR mobile terminal context of the NCR according to the first configuration. In some embodiments, the circuit is further configured to send a connection reconfiguration message to the NCR instead of a connection reestablishment message in response to the connection reestablishment request message. In some embodiments, the circuit is further configured to trust the NCR; and perform other security procedures after the NCR resumes providing forwarding functions.In some embodiments, the circuit is further configured to configure, for the RLF timer of the NCR, a shorter duration for detecting RLF than the RLF timer of a UE connected to the NCR via the forwarding function.

[0110] Thus, some embodiments relate to a method for a mobile telecommunications network, wherein the mobile telecommunications network includes an NCR and a base station; wherein the method includes: detecting RLF in a connection between the NCR and a cell provided by the base station; and based on the detected RLF, releasing a first configuration of a forwarding function of the NCR. In some embodiments, releasing the first configuration includes: deleting the first configuration. In some embodiments, the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. In some embodiments, releasing the first configuration at the base station is based on a release timer of the base station. In some embodiments, the release timer indicates that the first configuration is released after a time period corresponding to the duration of the RLF timer of the NCR. In some embodiments, the method includes: releasing the first configuration at the NCR to accept a second configuration of the forwarding function. In some embodiments, the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. In some embodiments, the method includes: performing cell selection in response to the detected RLF; and determining that the cell selected in the cell selection is provided by the base station. In some embodiments, the determination is based on a cell identifier of the selected cell. In some embodiments, the method further comprises: sending a connection re-establishment request message from the NCR to the base station. In some embodiments, the method further comprises: providing a second configuration from the base station to the NCR. In some embodiments, the method further comprises: requesting the second configuration from the NCR to the base station. In some embodiments, the request comprises: sending a request for the second configuration in a connection re-establishment request message. In some embodiments, the request comprises: sending a request for the second configuration in a connection re-establishment complete message. In some embodiments, the providing comprises: sending the second configuration in a connection re-establishment message. In some embodiments, the providing comprises: sending the second configuration in a connection re-configuration message. In some embodiments, the connection re-establishment request message comprises an indication of RLF of the NCR as a re-establishment cause. In some embodiments, the method further comprises: sending a reuse indication from the base station to the NCR in the connection re-establishment message for continuing to provide a forwarding function based on the first configuration. In some embodiments, the base station sends the reuse indication if the base station maintains a UE context of a UE connected to the NCR according to the first configuration. In some embodiments, the base station sends the reuse indication if the base station maintains an NCR mobile terminal context of the NCR according to the first configuration. In some embodiments, if the base station does not maintain a UE context of a UE connected to the NCR according to the first configuration, the base station does not send a reuse indication. In some embodiments, if the base station does not maintain an NCR mobile terminal context of the NCR according to the first configuration, the base station does not send a reuse indication.In some embodiments, the method further comprises: if the connection re-establishment message includes a reuse indication, continuing to provide the forwarding function based on the first configuration by the NCR. In some embodiments, the method further comprises: if the connection re-establishment message does not include a reuse indication, receiving a second configuration. In some embodiments, the method further comprises: in response to the connection re-establishment request message, sending a connection reconfiguration message instead of a connection re-establishment message from the base station to the NCR. In some embodiments, the method further comprises: trusting the NCR and the base station; and performing other security procedures after the NCR resumes providing the forwarding function. In some embodiments, detecting the RLF by the NCR is based on an RLF timer of the NCR. In some embodiments, detecting the RLF by the NCR comprises: indicating the RLF by the RLF timer of the NCR after a shorter duration than the RLF timer of the UE connected to the NCR via the forwarding function. In some embodiments, the method further comprises: configuring, by the base station, a shorter duration for detecting the RLF than the RLF timer of the UE for the RLF timer of the NCR.

[0111] Therefore, some embodiments relate to a mobile telecommunication system comprising an NCR as described above; and a base station as described above; wherein the circuitry of the NCR and the circuitry of the base station are configured to perform the method as described above.

[0112] Return to Figure 2 , Figure 2 A first method of a mobile telecommunication system according to an embodiment is shown. The mobile telecommunication system includes an NCR 1 with an NCR-MT 2 and an NCR-Fwd 3. The mobile telecommunication system also includes a gNB 4, which is an NR base station according to 5G, and user equipment (UE) UE1 5a and UE2 5b. The NCR 1 is connected to a 5G cell provided by the gNB 4.

[0113] At S10, gNB 4 receives a signal via control link 6 ( Figure 2 S10 occurs when the NCR-MT 2 is in RRC_Connected mode and has been authorized by the network to operate as NCR 1.

[0114] User equipment UE1 5a and UE2 5b are connected to gNB 4 via NCR 1.

[0115] At S11a, gNB 4 connects to the backhaul link 7 ( Figure 2 (not shown) sends data for UE1 5a to NCR-Fwd 3, and NCR-Fwd 3 receives the data. At S11b, NCR-Fwd 3 receives the data via access link 8 ( Figure 2 ) forwards the data to UE1 5a, and UE1 5a receives the data.

[0116] Likewise, at S12a, gNB 4 sends data for UE2 5b to NCR-Fwd 3 via backhaul link 7, and NCR-Fwd 3 receives the data. At S12b, NCR-Fwd 3 receives data for UE2 5b via access link 8 ( Figure 2 ) forwards the data to UE2 5b, and UE2 5b receives the data.

[0117] Similarly, NCR-Fwd 3 can receive data from UE1 5a or UE2 5b via access link 8, and can forward the data to gNB 4 via backhaul link 7.

[0118] At S13, a radio link failure (RLF) occurs in the control link 6 and in the backhaul link 7; that is, an RLF occurs in the connection between the NCR 1 and the gNB 4. Figure 2 In the case of RLF, the RLF is triggered by a rapid change in radio conditions that briefly interrupts the connection between NCR 1 and gNB 4. During the interruption, NCR 1 does not receive data sent by gNB 4, and gNB 4 does not receive data sent by NCR 1.

[0119] At S14, NCR 1 detects and declares RLF. The RLF detection of NCR 1 is based on the RLF timer of NCR 1, and if NCR 1 receives a predetermined number of out-of-sync (OOS) indications and does not restore synchronization with gNB 4 within a predetermined duration indicated by the RLF timer of NCR 1, the RLF timer of NCR 1 indicates RLF.

[0120] In some embodiments, gNB 4 also detects the RLF and deletes the first configuration, which is an example of releasing the first configuration. In some embodiments, a release timer of gNB 4 indicates that the first configuration is released (e.g., deleted) after a time period equal to the duration of the RLF timer of NCR 1.

[0121] At S15, NCR 1 performs cell selection and deletes the first configuration of NCR-Fwd 3 to accept the second configuration of NCR Fwd 3. Deleting the first configuration is an example of releasing the first configuration.

[0122] In cell selection, NCR 1 selects a cell provided by gNB 4 to which it was connected before the RLF occurred and to which the connection has been interrupted by RLF. NCR 1 determines that the cell selected in cell selection is the same as the cell to which it was connected before the RLF. This determination is based on determining that the CellIdentity, which is a cell identifier, of the selected cell is equal to the CellIdentity of the cell to which it was previously connected. Alternatively, the selected cell is another cell provided by (e.g., controlled by) the same gNB 4 as the cell to which the connection has been interrupted by RLF.

[0123] At S16, NCR-MT 2 sends an RRC re-establishment request message to gNB 4 via control link 6, and gNB 4 receives the RRC re-establishment request message. The RRC re-establishment request message is an example of a connection re-establishment request message. Because NCR 1 has determined that it was connected to the cell before RLF, NCR 1 requests to re-establish the connection instead of establishing the connection.

[0124] At S17a, gNB 4 sends an RRC re-establishment message to NCR-MT 2 via control link 6, and NCR-MT 2 receives the RRC re-establishment message. The RRC re-establishment message is an example of a connection re-establishment message. The RRC re-establishment message includes a configuration of NCR 1, which includes a second configuration of NCR-Fwd 3. Like the first configuration, the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. NCR 1 configures NCR-Fwd 3 according to the second configuration.

[0125] At S18, NCR-MT 2 sends an RRC Re-establishment Complete message to gNB 4 via control link 6, and gNB 4 receives the RRC Re-establishment Complete message. The RRC Re-establishment Complete message is an example of a connection re-establishment complete message.

[0126] At S19a, gNB 4 sends an RRC reconfiguration message to NCR-MT 3 via control link 6, and NCR-MT 3 receives the RRC reconfiguration message. The RRC reconfiguration message is an example of a connection reconfiguration message.

[0127] At S20, NCR-MT 2 sends an RRC reconfiguration complete message to gNB 4 via control link 6, and gNB 4 receives the RRC reconfiguration complete message. The RRC reconfiguration complete message is an example of a connection reconfiguration complete message.

[0128] After S20, NCR 1 and gNB 4 can communicate with each other via control link 6 and via backhaul link 7, and can forward communications via access link 8, NCR-Fwd 3 and backhaul link 7.

[0129] At the same time, i.e., between S13 and S20, UE1 5a detects and declares RLF at S21 and performs cell selection at S22. When NCR-Fwd 3 has resumed its forwarding function based on the second configuration, UE1 5a selects the cell provided by gNB 4 and forwarded by NCR-Fwd 3.

[0130] Likewise, between S13 and S20, UE2 5b detects and declares RLF at S23 and performs cell selection at S24. Similar to UE1 5a, UE2 5b selects the cell provided by gNB 4 and forwarded by NCR-Fwd3.

[0131] At S25, UE1 5a connects to the selected cell via access link 8, NCR-Fwd3 and backhaul link 7 by exchanging messages with gNB 4. The connection includes: sending an RRC re-establishment request message, receiving an RRC re-establishment message, sending an RRC re-establishment complete message, receiving an RRC reconfiguration message, and sending an RRC reconfiguration complete message.

[0132] Likewise, at S26, UE2 5b connects to the selected cell via access link 8, NCR-Fwd 3, and backhaul link 7 by exchanging messages with gNB 4. The connection includes sending an RRC re-establishment request message, receiving an RRC re-establishment message, sending an RRC re-establishment complete message, receiving an RRC reconfiguration message, and sending an RRC reconfiguration complete message.

[0133] Therefore, in some embodiments, Figure 1 The method allows reestablishing the connection between NCR 1 and gNB 4 after RLF. In some embodiments, performing connection reestablishment and connection reconfiguration allows NCR 1 to recover from RLF faster and restore NCR-Fwd 3 forwarding functionality faster than a new connection establishment and connection configuration.

[0134] Figure 3 A second method of a mobile telecommunication system according to an embodiment is shown. Figure 3 Methods and Figure 2 The method is similar to . Figure 3 The method of Figure 2 Features of the method having the same reference numerals correspond to Figure 2 For detailed description, refer to Figure 2 The corresponding description of .

[0135] Figure 3 Methods and Figure 2 The difference between the methods of FIG. 1 and FIG. 2 is that gNB 4 sends an NCR configuration including a second configuration of NCR-Fwd 3 in an RRC reconfiguration message instead of an RRC reestablishment message at S19b, and NCR-MT 2 receives the second configuration at S19b. Therefore, at S17b, gNB 4 sends an RRC reestablishment message without the NCR configuration.

[0136] Therefore, in some embodiments, Figure 3 In the method, the reception of the second configuration can be more easily achieved because the second configuration is sent together with other configurations in the RRC reconfiguration message.

[0137] However, in some embodiments, Figure 2 In the method, NCR-Fwd 3 can resume providing the forwarding function earlier because NCR-MT 2 receives the second configuration earlier, so that NCR-Fwd 3 can be configured according to the second configuration starting from S17a.

[0138] In some embodiments, NCR 1 (including NCR-MT 2 and NCR-Fwd 3) and gNB 4 include a Figure 2 and / or Figure 3 The method is a circuit for corresponding processing.

[0139] Some embodiments relate to a network controlled repeater (NCR) for a mobile telecommunications network, wherein the NCR includes circuitry configured to: detect a radio link failure (RLF) in a connection between the NCR and a cell provided by a base station of the mobile telecommunications network; and send a connection re-establishment request message to the base station, the connection re-establishment request message including an indication of the RLF of the NCR as a re-establishment cause.

[0140] As discussed above, the mobile telecommunications network may be based on 5G and new radio (NR). The base station may include a 5GgNB and may provide a cell according to 5G. For example, the cell may include an NR cell. In some embodiments, the base station may provide multiple NR cells.

[0141] As discussed above, the NCR may include an NCR-mobile terminal (NCR-MT) connected to a base station via a control link and an NCR-Fwd connected to the base station via a backhaul link and connected to one or more user equipments (UEs) via an access link. The NCR-Fwd may include a forwarding function for forwarding communications between one or more UEs and a base station via an access link and a backhaul link. The NCR-MT may receive a first configuration of a forwarding function for a connected NCR based on radio resource control (RRC) signaling, for example, via a control link. For example, the first configuration may include a configuration of the NCR-MT for communicating with a base station via a control link. For example, the first configuration may include a configuration of the NCR-Fwd for forwarding communications between a base station and one or more UEs via a backhaul link and an access link, and the NCR may configure the NCR-Fwd according to the first configuration.

[0142] The NCR-Fwd may be connected to a plurality of UEs via an access link and may forward communications between the base station and each of the plurality of UEs.

[0143] The RLF may be an RLF in an NCR (e.g., in an NCR-MT). The NCR may detect an RLF if its RRC receives a predetermined number of out-of-sync (OOS) indications from the physical layer and then a predetermined duration of an RLF timer of the NCR expires before synchronization is restored. Alternatively, the NCR may detect an RLF based on a received signal strength indicator (RSSI), received signal received power (RSRP), and / or received signal received quality (RSRQ) and an RLF timer. For example, the NCR may detect an RLF if the RSSI, RSRP, and / or RSRQ drop below a predetermined threshold for a predetermined duration indicated by the RLF timer.

[0144] The NCR may release the first configuration in response to detecting the RLF, for example, before performing cell selection or before sending a connection reestablishment request message to the selected cell selected in the cell selection. The release may include marking the first configuration as deleted, overwritten, or reused based on signaling (e.g., RRC signaling) received from the selected cell. For example, the release may include setting a release flag indicating that the first configuration is released.

[0145] The connection re-establishment message may include an RRCReestablishmentRequest message. The connection re-establishment message may include an indication of RLF as a re-establishment cause as a bit or a value, the bit may be set to indicate RLF as a re-establishment cause, the value may be inserted into the connection re-establishment message to indicate RLF as a re-establishment cause. For example, in addition to the re-establishment causes "reconfigurationFailure", "handoverFailure", "otherFailure" and "spare1" defined for the conventional 5G RRC re-establishment request message, a new re-establishment cause value may be defined, which may indicate to the base station that the connection re-establishment request message is from the NCR. The new re-establishment cause value may also indicate that the selected cell to which the connection re-establishment request message is sent is the same cell as the previous cell where the connection has been interrupted by RLF, and that the NCR is ready to reuse the first configuration.

[0146] For example, fast recovery may be useful for situations where a rapid change in radio conditions has triggered an RLF. In this case, the NCR-MT may indicate to the base station (e.g., to the gNB) that it is able to recover quickly by including an indication of RLF as the re-establishment cause.

[0147] In some embodiments, the circuit is further configured to perform cell selection in response to the detected RLF; and determine that the cell selected in the cell selection is provided by the base station. For example, the determination may include that the selected cell is the same cell as the cell whose connection has been interrupted by the RLF. For example, the determination may include that the selected cell is another cell other than the cell whose connection has been interrupted by the RLF, but the selected cell is also provided by the (same) base station.

[0148] For example, the cell selection may be based on RSSI, RSRP and / or RSRQ of one or more cells received by the NCR. The cell selection may also be based on the mobile network operator, radio access technology, state, cell identifier, frequency range and / or maximum possible data rate of one or more cells. For example, the NCR may preferably select a cell that has been disconnected by RLF or a cell provided by a base station that has been disconnected by RLF.

[0149] For example, if the selected cell is the same cell whose connection has been interrupted by RLF, the base station may retrieve a first configuration and / or context associated with the NCR and / or associated with a UE connected to the base station via the NCR. Similarly, if the selected cell is another cell other than the cell whose connection has been interrupted by RLF but provided by the same base station, the base station may internally coordinate contexts associated with the NCR and / or associated with a UE connected to the base station via the NCR so that the base station may retrieve a first configuration and / or context associated with the NCR and / or associated with a UE connected to the base station via the NCR.

[0150] For example, in cell selection, the NCR may be provided with a list of cells where the NCR may expect to reuse a previous configuration and / or accelerate re-establishment, e.g., because the cells may be provided by a base station. For example, the list may be shared in a security protection message to establish trust later. The NCR may preferably select a cell from the list.

[0151] In some embodiments, the determination is based on a cell identifier of the selected cell. For example, the determination may include determining that the cell identifier of the selected cell is equal to the cell identifier of the cell whose connection has been interrupted by RLF. For example, the determination may include determining that the cell identifier of the selected cell is associated with the (same) base station. The cell identifier may include a CellIdentity included in minimum system information (MSI) (e.g., system information block 1 (SIB1)) and may be unique.

[0152] In some embodiments, the circuit is further configured to receive, from the base station, a reuse indication for connecting to the base station based on the first configuration of the connection for which the RLF has been detected.

[0153] For example, the first configuration may include configuration of NCR-MT and / or NCR-Fwd. The first configuration may include configuration of how NCR-MT communicates with the base station via a control link. The first configuration may include configuration of how NCR-Fwd forwards communications between the base station and one or more UEs via a backhaul link and an access link.

[0154] The reuse indication may make the sending of the second configuration of the NCR unnecessary so that the NCR may reuse the first configuration for connecting to the base station and less signaling is necessary for the connection. Thus, the NCR may connect to the base station more quickly than if the NCR had to receive the second configuration instead of reusing the first configuration.

[0155] The reuse indication may, for example, comprise a bit that may be set in, or a value inserted into, a message from the base station to the NCR.

[0156] For example, the base station may store the first configuration for a predetermined period of time after RLF. Upon receiving a connection reestablishment request message indicating RLF as a reestablishment cause from the NCR, the base station may determine that the base station has stored the first configuration and may include a reuse indication in the connection reestablishment message.

[0157] In some embodiments, the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration, as described in more detail above.

[0158] In some implementations, the first configuration corresponds to a forwarding function of the NCR, for example, corresponds to NCR-Fwd.

[0159] In some embodiments, the detection of RLF is based on a RLF timer of the NCR, wherein the RLF timer is configured to indicate RLF after a shorter duration than a RLF timer of a UE connected to the NCR via the forwarding function.

[0160] For example, to avoid all UEs under the NCR from performing re-establishment, the RLF timer of the NCR-MT can be smaller than that for normal UEs, so that the NCR declares RLF before the UE. If the NCR selects the same cell as before the RLF, RLF can be avoided for multiple UEs. In some embodiments, this is a network-specific implementation and has no impact on 3GPP or other mobile telecommunication standard specifications.

[0161] In some embodiments, the reuse indication is included in a connection re-establishment message.The connection re-establishment message may include an RRCReestablishment message sent from the base station to the NCR-MT in response to the Connection Re-establishment Request message.

[0162] For example, if the old serving cell is the same as the new serving cell, the network may send an RRC re-establishment message with information that the NCR-MT and / or NCR-Fwd should continue to use its previous configuration (i.e., the first configuration). The NCR-MT may then resume the suspended (i.e., released) configuration, and the NCR may configure the NCR-MT and / or NCR-Fwd according to the first configuration. If no such indication is received in the re-establishment message, the NCR-MT may continue the old re-establishment process.

[0163] In some embodiments, the circuit is further configured to connect to the base station based on the first configuration if the NCR receives a connection re-establishment message with a reuse indication. For example, the NCR can connect to the base station based on the first configuration when receiving a connection re-establishment message with a reuse indication without expecting another configuration from the base station.

[0164] In some embodiments, the circuit is further configured to send a connection reestablishment complete message to the base station in response to the connection reestablishment message with the reuse indication. The connection reestablishment complete message may include an RRCReestablishmentComplete message. The connection reestablishment complete message may indicate to the base station that the NCR has received the reuse indication and / or that the NCR is connecting to the base station based on the first configuration.

[0165] In some embodiments, the circuit is further configured to send a connection reconfiguration complete message to the base station in response to the connection reestablishment message with the reuse indication. The connection reconfiguration complete message may include an RRCReconfigurationComplete message. For example, the NCR may send a connection reconfiguration complete message instead of a connection reestablishment complete message (and not receive a connection reconfiguration message, such as an RRCReconfiguration message) to indicate to the base station that the NCR reuses the first configuration and the base station does not need to send any additional configurations.

[0166] In some embodiments, the circuit is further configured to determine that the connection reestablishment message received from the base station does not include a reuse indication; and send a connection reestablishment complete message to the base station. The connection reestablishment message may include an RRCReestablishment message, and the connection reestablishment complete message may include an RRCReestablishmentComplete message.

[0167] For example, if the base station does not store the first configuration, the base station may send a connection re-establishment message without a reuse indication.

[0168] For example, a problem may be that the network may have deleted the context of the NCR, for example, in the case where the NCR returns after a few hours (e.g., the NCR can only be used during busy hours). In this case, the network may not send the above-mentioned reuse indication in the connection re-establishment message.

[0169] For example, the connection re-establishment complete message may indicate to the base station that the NCR did not receive a reuse indication and / or that the NCR expects further configuration from the base station.

[0170] In some embodiments, the circuit is further configured to receive, from the base station in response to the connection reestablishment complete message, a connection reconfiguration message indicating a second configuration for connecting to the base station. The connection reconfiguration message may include an RRCReconfiguration message.

[0171] In some embodiments, the circuit is further configured to receive a connection reconfiguration message instead of a connection reestablishment message from the base station in response to the connection reestablishment request message; wherein the connection reconfiguration message indicates a second configuration for connecting to the base station. The connection reconfiguration message may include an RRCReconfiguration message, and the connection reestablishment message may include an RRCReestablishment message.

[0172] For example, the content of the RRC re-establishment message may be skipped and a reconfiguration message may be sent instead.

[0173] Therefore, the NCR-MT can receive the second configuration earlier than when the RRC re-establishment message and the RRC re-establishment complete message are sent.

[0174] In some embodiments, the circuit is further configured to trust the base station; and perform other security procedures after connecting to the base station based on the second configuration.

[0175] For example, RRC re-establishment messages may be required for security (mutual authentication). However, if the NCR selects the same cell as before the RLF or a cell provided by the (same) base station, the base station (e.g., gNB) and NCR can trust each other. Additional security procedures may occur later, as it may be critical to first resume UE communications (e.g., forwarding communications between one or more UEs and the base station by the NCR-Fwd).

[0176] In some embodiments, the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. For example, the second configuration may configure aspects similar to the first configuration.

[0177] In some embodiments, the NCR-MT enhancements described above may also be applied to ordinary UEs and may be supported by UEs implementing Rel-18 or later versions. In such embodiments, the first configuration and / or the second configuration may, for example, include a configuration of how the UE is connected to a base station. In addition, in such embodiments, the indication of the UE's RLF as a re-establishment cause may indicate that the UE has not deleted the configuration of the previous connection that has been interrupted by the RLF, and is ready to reconnect based on the configuration of the previous connection.

[0178] Thus, some embodiments relate to a user equipment (UE) for a mobile telecommunications network, wherein the UE includes a circuit configured to: detect RLF in a connection between the UE and a cell provided by a base station of the mobile telecommunications network; and send a connection re-establishment request message to the base station, the connection re-establishment request message including an indication of the RLF of the user equipment as a re-establishment cause. In some embodiments, the circuit is further configured to perform cell selection in response to the detected RLF; and determine that the cell selected in the cell selection is provided by the base station. In some embodiments, the determination is based on a cell identifier of the selected cell. In some embodiments, the circuit is further configured to receive from the base station a reuse indication for connecting to the base station based on a first configuration of the connection in which the RLF has been detected. In some embodiments, the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. In some embodiments, the reuse indication is included in the connection re-establishment message. In some embodiments, the circuit is further configured to connect to the base station based on the first configuration if the UE receives a connection re-establishment message with a reuse indication. In some embodiments, the circuit is further configured to send a connection re-establishment complete message to the base station in response to the connection re-establishment message with a reuse indication. In some embodiments, the circuit is further configured to send a connection re-configuration complete message to the base station in response to the connection re-establishment message with a reuse indication. In some embodiments, the circuit is further configured to determine that the connection re-establishment message received from the base station does not include a reuse indication; and send a connection re-establishment complete message to the base station. In some embodiments, the circuit is further configured to receive a connection re-configuration message indicating a second configuration for connecting to the base station from the base station in response to the connection re-establishment complete message. In some embodiments, the circuit is further configured to receive a connection re-configuration message from the base station instead of a connection re-establishment message in response to a connection re-establishment request message; wherein the connection re-configuration message indicates a second configuration for connecting to the base station. In some embodiments, the circuit is further configured to trust the base station; and perform other security procedures after connecting to the base station based on the second configuration. In some embodiments, the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0179] Thus, some embodiments relate to a base station for a mobile telecommunications network, wherein the base station comprises a circuit configured to: detect RLF in a connection between a network entity of the mobile telecommunications network and a cell provided by the base station; and receive a connection re-establishment request message from the network entity, the connection re-establishment request message comprising an indication of the RLF of the network entity as a re-establishment cause. In some embodiments, the network entity comprises at least one of an NCR and a UE. In some embodiments, the circuit is further configured to send a reuse indication to the network entity for connecting to the base station based on a first configuration of the connection in which the RLF has been detected. In some embodiments, the circuit is configured to send the reuse indication if the base station maintains a context associated with the network entity. In some embodiments, the first configuration comprises at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. In some embodiments, the network entity comprises an NCR; and the first configuration corresponds to a forwarding function of the NCR. In some embodiments, the base station is further configured to configure, for an RLF timer of the NCR, a duration for detecting the RLF that is shorter than an RLF timer of a UE connected to the NCR via the forwarding function. In some embodiments, the reuse indication is included in the connection re-establishment message. In some embodiments, the circuit is further configured to receive a connection reestablishment complete message from the network entity in response to the connection reestablishment message with a reuse indication. In some embodiments, the circuit is further configured to receive a connection reconfiguration complete message from the network entity in response to the connection reestablishment message with a reuse indication. In some embodiments, the circuit is further configured to receive a connection reestablishment complete message from the network entity in response to sending a connection reestablishment message that does not include a reuse indication to the network entity. In some embodiments, the circuit is further configured to send a connection reconfiguration message indicating a second configuration for connecting to the base station to the network entity in response to the connection reestablishment complete message. In some embodiments, the circuit is further configured to send a connection reconfiguration message to the network entity in response to the connection reestablishment request message instead of the connection reestablishment message; wherein the connection reconfiguration message indicates the second configuration for connecting to the base station. In some embodiments, the circuit is further configured to trust the network entity; and after the network entity is connected to the base station based on the second configuration, perform other security procedures. In some embodiments, the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0180] Thus, some embodiments relate to a method for a mobile telecommunications network, wherein the mobile telecommunications network comprises a base station and a network entity; wherein the method comprises: detecting RLF in a connection between the network entity and a cell provided by the base station; and sending a connection re-establishment request message from the network entity to the base station, the connection re-establishment request message comprising an indication of the RLF of the network entity as a re-establishment cause. In some embodiments, the network entity comprises at least one of an NCR and a UE. In some embodiments, the method further comprises: performing cell selection in response to the detected RLF; and determining that the cell selected in the cell selection is provided by the base station. In some embodiments, the determination is based on a cell identifier of the selected cell. In some embodiments, the method further comprises: sending a reuse indication from the base station to the network entity for connecting to the base station based on a first configuration of the connection in which the RLF has been detected. In some embodiments, the base station sends the reuse indication if the base station maintains a context associated with the network entity. In some embodiments, the first configuration comprises at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration. In some embodiments, the network entity comprises an NCR; and the first configuration corresponds to a forwarding function of the NCR. In some embodiments, detecting the RLF by the NCR is based on an RLF timer of the NCR, wherein the RLF timer is configured to indicate the RLF after a shorter duration than the RLF timer of the UE connected to the NCR via the forwarding function. In some embodiments, the method further comprises: configuring, by the base station, a shorter duration for detecting the RLF for the RLF timer of the NCR than the RLF timer of the UE. In some embodiments, the reuse indication is included in the connection re-establishment message. In some embodiments, the method further comprises: if the network entity receives a connection re-establishment message with a reuse indication, connecting to the base station based on the first configuration. In some embodiments, the method further comprises: in response to the connection re-establishment message with the reuse indication, sending a connection re-establishment complete message from the network entity to the base station. In some embodiments, the method further comprises: in response to the connection re-establishment message with the reuse indication, sending a connection reconfiguration complete message from the network entity to the base station. In some embodiments, the method further comprises: determining that the connection re-establishment message received by the network entity from the base station does not include the reuse indication; and sending a connection re-establishment complete message from the network entity to the base station. In some embodiments, the method further comprises: in response to the connection reestablishment complete message, sending a connection reconfiguration message from the base station to the network entity indicating a second configuration for connecting to the base station. In some embodiments, the method further comprises: in response to the connection reestablishment request message, sending a connection reconfiguration message instead of a connection reestablishment message from the base station to the network entity; wherein the connection reconfiguration message indicates the second configuration for connecting to the base station.In some embodiments, the method further comprises: trusting the network entity and the base station; and performing other security procedures after the network entity is connected to the base station based on the second configuration. In some embodiments, the second configuration comprises at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0181] Therefore, some embodiments relate to a mobile telecommunication system comprising a base station as described above; and at least one of an NCR as described above and a UE as described above; wherein the circuitry of the base station and the circuitry of at least one of the NCR and the UE are configured to perform the method as described above.

[0182] Figure 4 A third method of a mobile telecommunication system according to an embodiment is shown. The processing from S10 to S13 corresponds to Figure 2 and Figure 3 S10 to S13 of the method, and therefore, for the sake of brevity, are no longer described with respect to Figure 4 Have a discussion.

[0183] At S30, NCR-Fwd 3 detects and declares RLF, similar to Figure 2 and Figure 3 However, at S30, the RLF timer of NCR 1 is configured to detect RLF after a shorter duration than the RLF timers of UE 5a and 5b. Therefore, at S30, NCR 1 detects RLF before UE1 5a and UE2 5b will detect RLF.

[0184] At S31, NCR-Fwd 3 executes Figure 2 and Figure 3 The cell selection at S15 of the method is similar to the cell selection at S15 of the method. In some embodiments, at S31, NCR-Fwd 3 releases or deletes its configuration during or after cell selection.

[0185] The NCR 1 determines, based on a comparison of CellIdentity as an example of a cell identifier, that the cell selected at S31 is the same cell to which the NCR 1 had been connected before the RLF and to which the connection was disconnected by the RLF.

[0186] Therefore, at S32, NCR-MT 2 sends an RRC re-establishment request message to gNB 4 for requesting to re-establish the connection that has been interrupted by RLF. The RRC re-establishment request message is an example of a connection re-establishment request message. In some embodiments, the RRC re-establishment request message also includes an indication indicating RLF as the re-establishment cause.

[0187] gNB 4 determines that NCR 1 is capable of quickly recovering from RLF based on the RRC re-establishment request message and data associated with the connection that has been interrupted by RLF.

[0188] At S33, gNB 4 sends an RRC reconfiguration message including a configuration for connecting to gNB 4 to NCR-MT 2. The RRC reconfiguration message is an example of a connection reconfiguration message.

[0189] NCR 1 and gNB 4 maintain data about the security of the connection that has been interrupted by RLF, for example, data related to the mutual authentication of NCR 1 and gNB 4.

[0190] Therefore, in order to recover from RLF faster, NCR 1 and gNB 4 trust each other based on stored data about the security of the connection that has been interrupted by RLF, and skip the RRC Re-establishment message and the RRC Re-establishment Complete message.

[0191] NCR-MT 2 receives the RRC reconfiguration message and applies the configuration indicated in the RRC reconfiguration message.

[0192] At S34, NCR-MT 2 sends an RRC reconfiguration complete message to gNB 4. The RRC reconfiguration complete message is an example of a connection reconfiguration complete message.

[0193] After sending the RRC Reconfiguration Complete message, NCR 1 easily connects to gNB 4 and the forwarding function of NCR-Fwd 3 is restored.

[0194] Therefore, at S35 and S36, UE1 5a and UE2 5b have not detected or declared RLF, respectively, and can communicate with gNB 4 via access link 8, NCR-Fwd 3 and backhaul link 7.

[0195] Because the RLF timer of NCR 1 indicates RLF after a shorter duration than the RLF timers of UE1 5a and UE2 5b connected to gNB 4 via NCR-Fwd 3, NCR 1 can reconnect to gNB 4 and restore the forwarding function of NCR-Fwd 3 before the RLF timers of UE1 5a and UE2 5b detect RLF.

[0196] Therefore, communication between UE1 5a or UE2 5b and gNB 4 can continue after RLF at the backhaul link 7 without performing connection reestablishment and reconfiguration procedures for UE1 5a or UE2 5b.

[0197] In some embodiments, when the forwarding function of NCR-Fwd 3 is restored, after the RRC reconfiguration complete message at S34, other security procedures are performed by skipping the RRC re-establishment message and the RRC re-establishment complete message.

[0198] In some embodiments, the NCR 2, the gNB 4, and the UEs 5a and 5b each include a device configured to perform the above Figure 4 The method circuit.

[0199] However, the present disclosure is not limited to NCR. The improved recovery from RLF according to the present disclosure may be applied to a connection between a base station and any network entity (eg, NCR or UE).

[0200] Figure 5 A fourth method of a mobile telecommunication system according to an embodiment is shown. The mobile telecommunication system comprises a gNB 4 as an example of a base station and a network entity 40.

[0201] The gNB 4 provides a 5G cell according to New Radio (NR). The network entity 40 may include any entity capable of connecting to the 5G cell and capable of communicating with the gNB 4 according to NR. In some embodiments, the network entity 40 includes an NCR that connects to the gNB 4 via a control link and forwards communications between the gNB 4 and another network entity via a backhaul link and an access link. For example, the network entity 40 may include Figures 1 to 4 In some embodiments, the network entity 40 includes a UE connected to the gNB 4 directly or via the NCR. For example, the network entity 40 may include Figure 1 UE 5 Figures 2 to 4 UE1 5a and / or Figures 2 to 4 UE2 5b. In an embodiment where the network entity includes a UE or is configured as a UE, implemented or represented as a UE, it may also be a UE. For example, in some embodiments, the network entity 40 is represented as Figure 1 UE 5 Figures 2 to 4 UE15a and / or Figures 2 to 4 UE2 5b.

[0202] At S41, the network entity 40 and the gNB 4 are connected to each other and communicate with each other. The connection is based on the configuration sent from the gNB 4 to the network entity 40.

[0203] At S42, RLF occurs. The network entity 40 and the gNB 4 can no longer communicate with each other.

[0204] At S43, similar to Figure 2 and Figure 3 S14 of the method and Figure 4 In S30 of the method, the network entity 40 detects and declares RLF.

[0205] At S44, the network entity 40 executes Figure 4 S30 of the method is similar to the cell selection, and based on the comparison of CellIdentity as an example of a cell identifier, it is determined that the cell selected in the cell selection is the same cell to which the network entity 40 has been connected before the RLF occurs.

[0206] The network entity 40 does not delete its configuration at S44. Alternatively, the network entity 40 keeps its configuration, or in some embodiments, releases its configuration without deleting it.

[0207] At S45, the network entity 40 sends an RRC re-establishment request message to the gNB 4 to request to re-establish the connection that has been interrupted by RLF. The RRC re-establishment request message is an example of a connection re-establishment request message. The RRC re-establishment request message also includes an indication indicating RLF as the re-establishment cause.

[0208] gNB 4 receives the RRC re-establishment request with an indication indicating RLF as the re-establishment cause. gNB 4 determines based on the indication that the RLF is only temporary and that network entity 40 is able to recover quickly from the RLF because network entity 40 has not deleted its configuration.

[0209] At S46, gNB 4 determines whether the context associated with the connection to network entity 40 is still available or has been deleted, whether network entity 40 is an NCR-MT, and whether network entity 40 is a UE.

[0210] After the RLF, the gNB 4 releases the context associated with the connection to the network entity 40, but does not delete the context within a predetermined time period. Therefore, if the gNB 4 receives the RRC re-establishment request message within the predetermined time period, the gNB 4 finds the context. Figure 5 This is the case in .

[0211] In some embodiments, the release timer of gNB 4 indicates that the configuration of network entity 40 or the context associated with network entity 40 is released after a time period equal to the duration of the RLF timer of network entity 40.

[0212] At S47a, gNB 4 sends an RRC re-establishment message to network entity 40. The RRC re-establishment message is an example of a connection re-establishment message. The RRC re-establishment message includes a reuse indication indicating that network entity 40 should reuse the configuration of the connection that has been interrupted by RLF.

[0213] The network entity 40 receives the RRC re-establishment message and extracts the reuse indication. Based on the reuse indication, the network entity 40 applies the configuration of the connection that has been interrupted by RLF.

[0214] In an embodiment of a configuration in which the network entity 40 has released the connection to the gNB 4, the network entity 40 reactivates the released configuration.

[0215] The network entity 40 includes an NCR (such as Figures 1 to 4 In some embodiments of NCR 1), the configuration includes NCR (such as Figures 1 to 4 Configuration of the forwarding function of NCR-Fwd 3).

[0216] At S48a, the network entity 40 sends an RRC re-establishment complete message to the gNB 4. The RRC re-establishment complete message is an example of a connection re-establishment complete message. The RRC re-establishment complete message indicates to the gNB 4 that the network entity 40 is configured according to the reuse configuration of the connection that has been interrupted by the RLF, and that the network entity 40 does not expect any additional configuration.

[0217] In some embodiments, if the RRC re-establishment message at S47a does not include a reuse indication, the old reconfiguration process is performed, for example, gNB 4 sends an RRC reconfiguration message including a configuration for connecting to gNB 4 to network entity 40 after receiving the RRC re-establishment complete message, and network entity 40 sends an RRC reconfiguration complete message to gNB 4 after receiving the RRC reconfiguration message.

[0218] Figure 6 A fifth method of a mobile telecommunication system according to an embodiment is shown. Figure 6 S41 to S47a correspond to Figure 5 S41 to S47a; therefore, for the sake of brevity, their description is not repeated. Figure 6 Methods and Figure 5 The method is different in that it is performed at S48b instead of S48a.

[0219] At S48b, the network entity 40 sends an RRC reconfiguration complete message to the gNB 4. The RRC reconfiguration complete message is an example of a connection reconfiguration complete message. The RRC reconfiguration complete message indicates to the gNB 4 that the network entity 40 has received the reuse indication from S47a, that the network entity 40 is configured according to the reuse configuration of the connection that has been interrupted by the RLF, and that the network entity 40 does not expect any additional configuration. Therefore, in order to recover from the RLF faster, the RRC reestablishment complete message and the RRC reconfiguration message are skipped.

[0220] In some embodiments, if the RRC re-establishment message at S47a does not include a reuse indication, the old re-establishment and reconfiguration process is performed, for example, the network entity 40 sends an RRC re-establishment complete message instead of an RRC reconfiguration complete message to gNB 4 at S48b, gNB 4 sends an RRC reconfiguration message including a configuration for connecting to gNB 4 to the network entity 40 after receiving the RRC re-establishment complete message, and the network entity 40 sends an RRC reconfiguration complete message to gNB 4 after receiving the RRC reconfiguration message.

[0221] Figure 7 A sixth method of a mobile telecommunication system according to an embodiment is shown. Figure 7 S41 to S46 correspond to Figure 5 and Figure 6 S41 to S46; therefore, for the sake of brevity, their description is not repeated. Figure 7 Methods and Figure 6 The method of is different in that it is performed at S47b instead of S47a.

[0222] At S47b, gNB 4 sends an RRC reconfiguration message to network entity 40. The RRC reconfiguration message is an example of a connection reconfiguration message. If gNB 4 finds a context associated with a connection to network entity 40 at S46 (this is Figure 7 In the case where the configuration of the connection that has been interrupted by RLF is no longer applicable, the RRC reconfiguration message includes a new configuration for connecting to gNB 4. In the case where the configuration of the connection that has been interrupted by RLF is still applicable, the RRC reconfiguration message includes the configuration of the interrupted connection, or in some embodiments, includes a reuse indication to indicate to the network entity 40 that the configuration of the interrupted connection should be reused.

[0223] The network entity 40 receives the RRC reconfiguration message and applies the configuration included or indicated in the RRC reconfiguration message.

[0224] At S48b, the network entity 40 sends a signal to the gNB 4. Figure 6 However, if the RRC reconfiguration message of S47b includes a new configuration that is different from the configuration of the interrupted connection, the RRC reconfiguration complete message instructs gNB 4 to configure the network entity 40 according to the new configuration.

[0225] In some embodiments, if gNB 4 does not find a context associated with the connection to network entity 40 at S46, the old reestablishment and reconfiguration process is performed, for example, gNB 4 sends an RRC reestablishment message to network entity 40 before the RRC reconfiguration message at S47b, network entity 40 sends an RRC reestablishment complete message to gNB 4 before the RRC reconfiguration message at S47b after receiving the RRC reestablishment message, and gNB 4 sends the RRC reconfiguration message at S47b only after receiving the RRC reestablishment complete message.

[0226] In some embodiments, a base station (such as Figures 1 to 7 The gNB 4) includes a gNB configured to perform Figures 5 to 7 In some embodiments, a network entity (such as Figures 5 to 7 The network entity 40) includes a Figures 5 to 7 In some embodiments, the method comprises a circuit configured to perform at least one of the following steps. Figures 5 to 7 The network entity of the circuit of at least one of the methods includes a user equipment (such as a user equipment) that can be directly connected to the base station or can be connected to the base station via an NCR Figure 1 UE5 and / or Figures 2 to 4 UE1 5a and UE2 5b). In some embodiments, the Figures 5 to 7 At least one network entity in the method includes an NCR (such as Figures 1 to 4 NCR 1).

[0227] In some embodiments, Figure 2 and Figure 3 UE1 5a and / or UE2 5b are respectively Figures 5 to 7 Instead of performing cell selection at S22 and / or S24, cell selection is performed at S44 of gNB 4, and the cell selection is performed at S22 and / or S24, respectively, for connecting to gNB 4. Figures 5 to 7 One of the methods, rather than the re-establishment / reconfiguration process at S25 and / or S26.

[0228] Figure 8 A user equipment (UE), a network controlled relay (NCR) and a base station (BS) according to an embodiment are shown.

[0229] refer to Figure 8The embodiments of the UE 90 according to the present disclosure (which may also be implemented as the network entity discussed herein), the NCR 92 according to the present disclosure (which may also be implemented as the network entity discussed herein), the base station (BS) 95 according to the present disclosure (e.g., NR eNB / gNB), the communication path 104 between the UE 90 and the NCR 92, and the communication path 108 between the NCR 92 and the BS 95 are discussed for implementing the embodiments of the present disclosure.

[0230] The UE 90 has a transmitter 101, a receiver 102, and a controller 103, wherein, generally, the technical functions of the transmitter 101, the receiver 102, and the controller 103 are known to a skilled person, and therefore, a more detailed description of these elements is omitted.

[0231] The UE 92 has a transmitter 105, a receiver 106 and a controller 107, wherein, generally, the technical functions of the transmitter 105, the receiver 106 and the controller 107 are known to the skilled person and therefore, a more detailed description of these elements is omitted.

[0232] The BS 95 has a transmitter 109, a receiver 110 and a controller 111, wherein, also here, generally, the functions of the transmitter 109, the receiver 110 and the controller 111 are known to the skilled person and therefore, a more detailed description of these elements is omitted.

[0233] The communication path 104 has an uplink path 104a from the UE 90 to the NCR 92 and a downlink path 104b from the NCR 92 to the UE 90. According to the present disclosure, the communication path 104 includes an access link.

[0234] The communication path 108 has an uplink path 108a from the NCR 92 to the BS 95 and a downlink path 108b from the BS 95 to the NCR 92. According to the present disclosure, the communication path 108 includes a control link and a backhaul link.

[0235] During operation, the controller 103 of the UE 90 controls reception of downlink signals at the receiver 102 over the downlink path 104 b , and the controller 103 controls reception of uplink signals via the transmitter 101 over the uplink path 104 a .

[0236] Similarly, during operation, the controller 107 of NCR 92 controls the reception of uplink signals via the uplink path 104a and the reception of downlink signals via the downlink path 108b at the receiver 106, and the controller 107 controls the sending of downlink signals via the downlink path 104b and the sending of uplink signals via the uplink path 108a via the transmitter 105.

[0237] Similarly, during operation, controller 111 of BS 95 controls transmission of downlink signals at transmitter 109 via downlink path 108 b , and controller 111 controls reception of uplink signals at receiver 110 via uplink path 108 a .

[0238] Note that in some embodiments, UE 90 is directly connected to BS 95 without NCR 92 in between. In this case, communication path 104 coincides with communication path 108.

[0239] Below, reference Fig. 9 Describing an embodiment of a general purpose computer 130, Fig. 9 A general purpose computer according to an embodiment is shown.

[0240] The computer 130 can be implemented so that it can be used as substantially any type of user equipment, network-controlled repeaters, base stations or new radio base stations, transmission and reception points, or network entities, as discussed herein. The computer has components 131 to 141, which can form circuits (such as any of the circuits of a network-controlled repeater, base station, network entity, and user equipment, etc.), as described herein.

[0241] Implementations of the methods described herein using software, firmware, programs, etc. may be installed on the computer 130, which is then configured as appropriate for the particular implementation.

[0242] The computer 130 has a CPU 131 (central processing unit) that can execute various types of processes and methods as described herein, for example, based on programs stored in a read-only memory (ROM) 132, stored in a memory 137 and loaded into a random access memory (RAM) 133, stored on a medium 140 that can be inserted into a corresponding drive 139, and the like.

[0243] The CPU 131, ROM 132 and RAM 133 are connected to a bus 141, which in turn is connected to an input / output interface 134. The number of CPUs, memories and storage devices is merely exemplary, and the skilled person will appreciate that when the computer 130 is used as a network-controlled repeater, base station, network entity or user equipment, it can be adapted and configured accordingly to meet the specific requirements that arise.

[0244] At the input / output interface 134 several components are connected: input 135, output 136, memory 137, communication interface 138 and drive 139 into which a medium 140 (optical disc, digital video disc, compact flash memory, etc.) can be inserted.

[0245] The input 135 may be a pointer device (mouse, chart, etc.), a keyboard, a microphone, a camera, a touch screen, etc.

[0246] The output 136 may include a display (liquid crystal display, cathode ray tube display, light emitting diode display, electronic ink, etc.), a speaker, etc.

[0247] The storage 137 may have a hard disk, a solid state drive, or the like.

[0248] The communication interface 138 may be adapted to communicate, for example, via a local area network (LAN), a wireless local area network (WLAN), a mobile telecommunication system (GSM, UMTS, LTE, NR, etc.), Bluetooth, infrared, near field communication, etc.

[0249] It should be noted that the above description relates only to an example configuration of the computer 130. Alternative configurations may be implemented with additional or other sensors, storage devices, interfaces, etc. For example, the communication interface 138 may support other radio access technologies in addition to UMTS, LTE, NR, etc.

[0250] When the computer 130 is used as a base station, the communication interface 138 may also have a corresponding air interface (providing, for example, E-UTRA protocols OFDMA (downlink) and SC-FDMA (uplink)) and a network interface (implementing, for example, protocols such as S1-AP, GTP-U, S1-MME, X2-AP, etc.). The computer 130 is also implemented to transmit data according to TCP. In addition, the computer 130 may have one or more antennas and / or antenna arrays. The present disclosure is not limited to any particularity of such protocols.

[0251] The method described herein is also implemented in some embodiments as a computer program that causes a computer and / or processor to perform the method when executed on a computer and / or processor. In some embodiments, a non-transitory computer-readable recording medium is also provided, which stores a computer program product therein, which, when executed by a processor (such as the above-mentioned processor), causes the method described herein to be performed.

[0252] It should be appreciated that the embodiments describe methods with an exemplary ordering of method steps. However, the specific ordering of method steps is given for illustrative purposes only and should not be interpreted as binding. For example, Figures 2 to 4 The order of S11a / S11b and S12a / S12b in the embodiment of can be interchanged. Figure 2 and Figure 3 The order of S21 / S22 and S23 / S24 in the embodiment can be interchanged. In addition, Figure 2 and Figure 3 The order of S25 and S26 in the embodiment of can also be interchanged. Other changes in the order of the method steps may be obvious to the technician.

[0253] To the extent that the above disclosed embodiments are implemented at least in part using software controlled data processing apparatus, it will be appreciated that providing such software controlled computer programs and transmission, storage or other media providing such computer programs are contemplated as aspects of the present disclosure.

[0254] Note that the present technology can also be configured as described below.

[0255] (A1) A network controlled repeater for a mobile telecommunications network, wherein the network controlled repeater comprises circuitry configured to perform the following steps:

[0256] detecting a radio link failure in a connection between a network controlled repeater and a cell provided by a base station of a mobile telecommunications network; and

[0257] Based on the detected radio link failure, a first configuration of a forwarding function of a network controlled repeater is released.

[0258] (A2) The network-controlled repeater of (A1), wherein releasing the first configuration comprises: deleting the first configuration.

[0259] (A3) The network-controlled repeater of (A1) or (A2), wherein the first configuration comprises at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0260] (A4) A network-controlled repeater according to any one of (A1) to (A3), wherein the circuit is configured to release the first configuration to accept a second configuration of the forwarding function.

[0261] (A5) The network-controlled repeater of (A4), wherein the second configuration comprises at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0262] (A6) The network-controlled repeater according to (A4) or (A5), wherein the circuit is further configured to:

[0263] In response to the detected radio link failure, performing cell selection; and

[0264] It is determined that the cell selected in the cell selection is provided by the base station.

[0265] (A7) The network-controlled repeater of (A6), wherein the determination is based on a cell identifier of the selected cell.

[0266] (A8) The network-controlled repeater according to (A6) or (A7), wherein the circuit is further configured to send a connection re-establishment request message to the base station.

[0267] (A9) The network-controlled repeater of (A8), wherein the circuit is further configured to receive a second configuration from the base station.

[0268] (A10) The network-controlled repeater of (A9), wherein the circuit is further configured to request a second configuration from the base station.

[0269] (A11) The network-controlled repeater of (A10), wherein the request comprises: sending a request for the second configuration in a connection re-establishment request message.

[0270] (A12) The network-controlled repeater of (A10) or (A11), wherein the request comprises sending a request for the second configuration in a connection re-establishment complete message.

[0271] (A13) The network-controlled repeater of any one of (A9) to (A11), wherein the receiving comprises: receiving the second configuration in a connection re-establishment message.

[0272] (A14) The network-controlled repeater of any one of (A9) to (A13), wherein the receiving comprises: receiving the second configuration in a connection reconfiguration message.

[0273] (A15) A network-controlled repeater according to any one of (A8) to (A14), wherein the connection re-establishment request message includes an indication of a radio link failure of the network-controlled repeater as a re-establishment cause.

[0274] (A16) The network-controlled repeater according to any one of (A8) to (A15), wherein the circuit is further configured to:

[0275] receiving a connection re-establishment message from a base station; and

[0276] It is determined whether the connection re-establishment message includes a reuse indication for continuing to provide the forwarding function based on the first configuration.

[0277] (A17) The network-controlled repeater of (A16), wherein the circuit is further configured to continue to provide the forwarding function based on the first configuration if the connection re-establishment message includes a reuse indication.

[0278] (A18) The network-controlled repeater of (A16) or (A17), wherein the circuit is further configured to receive a second configuration if the connection re-establishment message does not include a reuse indication.

[0279] (A19) A network-controlled repeater according to any one of (A8) to (A15), wherein the circuit is further configured to receive a connection reconfiguration message instead of a connection reestablishment message from the base station in response to the connection reestablishment request message.

[0280] (A20) The network-controlled repeater according to (A19), wherein the circuit is further configured to:

[0281] Trust the base station; and

[0282] After the forwarding function is restored, other security procedures are performed.

[0283] (A21) The network-controlled repeater of any one of (A1) to (A20), wherein the detection of the radio link failure is based on a radio link failure timer of the network-controlled repeater.

[0284] (A22) A network-controlled repeater as described in (A21), wherein the radio link failure timer of the network-controlled repeater is configured to indicate a radio link failure after a duration shorter than the radio link failure timer of a user equipment connected to the network-controlled repeater via a forwarding function.

[0285] (B1) A base station for a mobile telecommunications network, wherein the base station comprises circuits configured to perform the following steps:

[0286] detecting a radio link failure in a connection between a network controlled repeater of a mobile telecommunications network and a cell provided by a base station; and

[0287] Based on the detected radio link failure, a first configuration of a forwarding function of a network controlled repeater is released.

[0288] (B2) The base station according to (B1), wherein releasing the first configuration includes: deleting the first configuration.

[0289] (B3) The base station according to (B1) or (B2), wherein the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0290] (B4) The base station according to any one of (B1) to (B3), wherein releasing the first configuration is based on a release timer of the base station.

[0291] (B5) The base station according to (B4), wherein the release timer is configured to indicate that the first configuration is released after a time period corresponding to a duration of a radio link failure timer of the network-controlled relay.

[0292] (B6) The base station according to any one of (B1) to (B5), wherein the circuit is further configured to receive a connection re-establishment request message from a network-controlled repeater.

[0293] (B7) The base station according to (B6), wherein the circuit is further configured to provide a second configuration of forwarding functionality to a network-controlled repeater.

[0294] (B8) The base station according to (B7), wherein the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0295] (B9) The base station of (B7) or (B8), wherein the circuit is further configured to receive a request for the second configuration from a network-controlled repeater.

[0296] (B10) The base station according to (B9), wherein the receiving includes: receiving a request for the second configuration in a connection re-establishment request message.

[0297] (B11) The base station according to (B9) or (B10), wherein the receiving includes: receiving a request for the second configuration in a connection reestablishment complete message.

[0298] (B12) The base station according to any one of (B7) to (B10), wherein the providing includes: sending the second configuration in a connection re-establishment message.

[0299] (B13) The base station according to any one of (B7) to (B12), wherein the providing includes: sending the second configuration in a connection reconfiguration message.

[0300] (B14) The base station according to any one of (B6) to (B13), wherein the connection re-establishment request message includes an indication of a radio link failure of a network-controlled repeater as a re-establishment cause.

[0301] (B15) A base station according to any one of (B6) to (B14), wherein the circuit is further configured to send a reuse indication to a network-controlled repeater in a connection re-establishment message for continuing to provide the forwarding function based on the first configuration.

[0302] (B16) The base station of (B15), wherein the circuit is configured to send a reuse indication if the base station maintains a user equipment context of a user equipment connected to the network-controlled relay according to the first configuration.

[0303] (B17) A base station according to (B15) or (B16), wherein the circuit is configured to send a reuse indication if the base station maintains a network-controlled repeater mobile terminal context of the network-controlled repeater according to the first configuration.

[0304] (B18) A base station according to any one of (B15) to (B17), wherein the circuit is configured to not send a reuse indication if the base station does not maintain a user equipment context of a user equipment connected to the network-controlled relay according to the first configuration.

[0305] (B19) A base station according to any one of (B15) to (B18), wherein the circuit is configured to not send a reuse indication if the base station does not maintain a network-controlled repeater mobile terminal context for the network-controlled repeater according to the first configuration.

[0306] (B20) A base station according to any one of (B6) to (B14), wherein the circuit is further configured to send a connection reconfiguration message instead of a connection reestablishment message to a network-controlled repeater in response to a connection reestablishment request message.

[0307] (B21) The base station according to (B20), wherein the circuit is further configured to:

[0308] Trusting the relays controlled by the network; and

[0309] After the network controlled repeater resumes providing forwarding functions, other security procedures are performed.

[0310] (B22) A base station according to any one of (B1) to (B21), wherein the circuit is further configured to: for a radio link failure timer of a network-controlled repeater, configure a duration for detecting a radio link failure that is shorter than a radio link failure timer of a user equipment connected to the network-controlled repeater via a forwarding function.

[0311] (C1) A method for use in a mobile telecommunications network,

[0312] Wherein, the mobile telecommunications network includes network-controlled repeaters and base stations;

[0313] Among them, the method includes:

[0314] detecting a radio link failure in a connection between a network controlled repeater and a cell provided by a base station; and

[0315] Based on the detected radio link failure, a first configuration of a forwarding function of a network controlled repeater is released.

[0316] (C2) The method according to (C1), wherein releasing the first configuration includes: deleting the first configuration.

[0317] (C3) The method according to (C1) or (C2), wherein the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0318] (C4) The method according to any one of (C1) to (C3), wherein releasing the first configuration at the base station is based on a release timer of the base station.

[0319] (C5) The method of (C4), wherein the release timer indicates that the first configuration is released after a time period corresponding to a duration of a radio link failure timer of the network-controlled relay.

[0320] (C6) A method according to any one of (C1) to (C5), wherein the method includes: releasing the first configuration at the network-controlled repeater to accept a second configuration of the forwarding function.

[0321] (C7) The method according to (C6), wherein the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0322] (C8) The method according to (C6) or (C7), further comprising:

[0323] In response to the detected radio link failure, performing cell selection; and

[0324] It is determined that the cell selected in the cell selection is provided by the base station.

[0325] (C9) The method according to (C8), wherein the determination is based on a cell identifier of the selected cell.

[0326] (C10) The method according to (C8) or (C9), further comprising: sending a connection re-establishment request message from a network-controlled repeater to the base station.

[0327] (C11) The method according to (C10), further comprising: providing a second configuration from the base station to the network-controlled repeater.

[0328] (C12) The method according to (C11) further includes: the network-controlled relay requests the base station for a second configuration.

[0329] (C13) The method according to (C12), wherein the request includes: sending a request for the second configuration in a connection re-establishment request message.

[0330] (C14) The method of (C12) or (C13), wherein the request includes sending a request for the second configuration in a connection reestablishment complete message.

[0331] (C15) The method according to any one of (C11) to (C13), wherein the providing includes: sending the second configuration in a connection re-establishment message.

[0332] (C16) The method of any one of (C11) to (C15), wherein the providing comprises: sending the second configuration in a connection reconfiguration message.

[0333] (C17) The method of any one of (C10) to (C16), wherein the connection re-establishment request message includes an indication of a radio link failure of the network-controlled repeater as a re-establishment cause.

[0334] (C18) The method according to any one of (C10) to (C17) further includes: sending a reuse indication for continuing to provide the forwarding function based on the first configuration in a connection re-establishment message from the base station to the network-controlled repeater.

[0335] (C19) The method according to (C18), wherein if the base station maintains the user equipment context of the user equipment of the network-controlled relay according to the first configuration, the base station sends the reuse indication.

[0336] (C20) The method of (C18) or (C19), wherein if the base station maintains the network-controlled relay mobile terminal context of the network-controlled relay according to the first configuration, the base station sends the reuse indication.

[0337] (C21) A method according to any one of (C18) to (C20), wherein if the base station does not maintain a user equipment context of a user equipment connected to the network-controlled relay according to the first configuration, the base station does not send a reuse indication.

[0338] (C22) A method according to any one of (C18) to (C21), wherein if the base station does not maintain a network-controlled relay mobile terminal context for the network-controlled relay according to the first configuration, the base station does not send a reuse indication.

[0339] (C23) The method according to any one of (C18) to (C22), further comprising: if the connection re-establishment message includes a reuse indication, the repeater controlled by the network continues to provide the forwarding function based on the first configuration.

[0340] (C24) The method according to any one of (C18) to (C23), further comprising: receiving a second configuration if the connection re-establishment message does not include a reuse indication.

[0341] (C25) The method according to any one of (C10) to (C17) further includes: in response to the connection reestablishment request message, sending a connection reconfiguration message instead of a connection reestablishment message from the base station to the network-controlled repeater.

[0342] (C26) The method according to (C25), further comprising:

[0343] Trusting the repeaters and base stations controlled by the network; and

[0344] After the network controlled repeater resumes providing forwarding functions, other security procedures are performed.

[0345] (C27) The method of any one of (C1) to (C26), wherein the network-controlled repeater detects the radio link failure based on a radio link failure timer of the network-controlled repeater.

[0346] (C28) A method according to (C27), wherein the detection of radio link failure by the network-controlled repeater includes: the radio link failure timer of the network-controlled repeater indicates a radio link failure after a duration shorter than the radio link failure timer of a user device connected to the network-controlled repeater via a forwarding function.

[0347] (C29) The method according to (C28) also includes: the base station configures a radio link failure timer of the network-controlled relay to have a duration for detecting a radio link failure that is shorter than the radio link failure timer of the user equipment.

[0348] (D1) A mobile telecommunication system comprising:

[0349] A network-controlled repeater according to any one of (A1) to (A22); and

[0350] A base station according to any one of (B1) to (B22);

[0351] The circuit of the network-controlled repeater and the circuit of the base station are configured to perform a method according to any one of (C1) to (C29).

[0352] (E1) A network controlled repeater for a mobile telecommunications network, wherein the network controlled repeater comprises circuitry configured to:

[0353] detecting a radio link failure in a connection between a network controlled repeater and a cell provided by a base station of a mobile telecommunications network; and

[0354] A connection re-establishment request message is sent to the base station, the connection re-establishment request message including an indication of a radio link failure of the network controlled repeater as a re-establishment cause.

[0355] (E2) The network-controlled repeater according to (E1), wherein the circuit is further configured to:

[0356] In response to the detected radio link failure, performing cell selection; and

[0357] It is determined that the cell selected in the cell selection is provided by the base station.

[0358] (E3) The network-controlled repeater of (E2), wherein the determination is based on a cell identifier of the selected cell.

[0359] (E4) A network-controlled repeater according to any one of (E1) to (E3), wherein the circuit is further configured to receive a reuse indication from the base station for connecting to the base station based on the first configuration of the connection in which the radio link failure has been detected.

[0360] (E5) The network-controlled repeater of (E4), wherein the first configuration comprises at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0361] (E6) A network-controlled repeater according to (E4) or (E5), wherein the first configuration corresponds to a forwarding function of the network-controlled repeater.

[0362] (E7) A network-controlled repeater as described in (E6), wherein the detection of the radio link failure is based on a radio link failure timer of the network-controlled repeater, wherein the radio link failure timer is configured to indicate the radio link failure after a duration shorter than a radio link failure timer of a user equipment connected to the network-controlled repeater via a forwarding function.

[0363] (E8) A network-controlled repeater according to any one of (E4) to (E7), wherein the reuse indication is included in a connection re-establishment message.

[0364] (E9) The network-controlled repeater of (E8), wherein the circuit is further configured to connect to the base station based on the first configuration if the network-controlled repeater receives a connection re-establishment message with a reuse indication.

[0365] (E10) A network-controlled repeater according to (E8) or (E9), wherein the circuit is further configured to send a connection re-establishment complete message to the base station in response to the connection re-establishment message with a reuse indication.

[0366] (E11) A network-controlled repeater according to (E8) or (E9), wherein the circuit is further configured to send a connection reconfiguration complete message to the base station in response to a connection reestablishment message with a reuse indication.

[0367] (E12) The network-controlled repeater according to any one of (E8) to (E11), wherein the circuit is further configured to:

[0368] determining that a connection re-establishment message received from the base station does not include a reuse indication; and

[0369] Send a connection re-establishment completion message to the base station.

[0370] (E13) The network-controlled repeater of (E12), wherein the circuit is further configured to receive a connection reconfiguration message indicating a second configuration for connecting to the base station from the base station in response to the connection reestablishment complete message.

[0371] (E14) The network-controlled repeater according to any one of (E1) to (E11), wherein the circuit is further configured to receive a connection reconfiguration message instead of a connection reestablishment message from the base station in response to the connection reestablishment request message;

[0372] The connection reconfiguration message indicates a second configuration for connecting to the base station.

[0373] (E15) The network-controlled repeater according to (E14), wherein the circuit is further configured to:

[0374] Trust the base station; and

[0375] After connecting to the base station based on the second configuration, other security procedures are performed.

[0376] (E16) A network-controlled repeater according to any one of (E13) to (E15), wherein the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0377] (F1) A user equipment for a mobile telecommunications network, wherein the user equipment comprises circuitry configured to:

[0378] detecting a radio link failure in a connection between a user equipment and a cell provided by a base station of a mobile telecommunications network; and

[0379] A connection re-establishment request message is sent to the base station, the connection re-establishment request message including an indication of a radio link failure of the user equipment as a re-establishment cause.

[0380] (F2) The user equipment according to (F1), wherein the circuit is further configured to:

[0381] In response to the detected radio link failure, performing cell selection; and

[0382] It is determined that the cell selected in the cell selection is provided by the base station.

[0383] (F3) The user equipment of (F2), wherein the determination is based on a cell identifier of the selected cell.

[0384] (F4) The user equipment according to any one of (F1) to (F3), wherein the circuit is further configured to receive a reuse indication from the base station for connecting to the base station based on the first configuration of the connection in which the radio link failure has been detected.

[0385] (F5) The user equipment according to (F4), wherein the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0386] (F6) The user equipment according to (F4) or (F5), wherein the reuse indication is included in a connection re-establishment message.

[0387] (F7) The user equipment according to (F6), wherein the circuit is further configured to connect to the base station based on the first configuration if the user equipment receives a connection re-establishment message with a reuse indication.

[0388] (F8) The user equipment according to (F6) or (F7), wherein the circuit is further configured to send a connection re-establishment complete message to the base station in response to the connection re-establishment message with a reuse indication.

[0389] (F9) The user equipment according to (F6) or (F7), wherein the circuit is further configured to send a connection reconfiguration complete message to the base station in response to a connection reestablishment message with a reuse indication.

[0390] (F10) The user equipment according to any one of (F6) to (F9), wherein the circuit is further configured to:

[0391] determining that a connection re-establishment message received from the base station does not include a reuse indication; and

[0392] Send a connection re-establishment completion message to the base station.

[0393] (F11) The user equipment according to (F10), wherein the circuit is further configured to receive, from the base station, a connection reconfiguration message indicating a second configuration for connecting to the base station in response to the connection reestablishment complete message.

[0394] (F12) The user equipment according to any one of (F1) to (F9), wherein the circuit is further configured to receive a connection reconfiguration message instead of a connection reestablishment message from the base station in response to the connection reestablishment request message;

[0395] The connection reconfiguration message indicates a second configuration for connecting to the base station.

[0396] (F13) The user equipment according to (F12), wherein the circuit is further configured to:

[0397] Trust the base station; and

[0398] After connecting to the base station based on the second configuration, other security procedures are performed.

[0399] (F14) The user equipment according to any one of (F11) to (F13), wherein the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0400] (G1) A base station for a mobile telecommunications network, wherein the base station comprises circuitry configured to:

[0401] detecting a radio link failure in a connection between a network entity of a mobile telecommunications network and a cell provided by a base station; and

[0402] A connection re-establishment request message is received from a network entity, the connection re-establishment request message including an indication of a radio link failure of the network entity as a re-establishment cause.

[0403] (G2) The base station according to (G1), wherein the network entity includes at least one of a network-controlled relay and a user equipment.

[0404] (G3) The base station according to (G1) or (G2), wherein the circuit is further configured to send a reuse indication to the network entity for connecting to the base station based on the first configuration of the connection in which the radio link failure has been detected.

[0405] (G4) The base station of (G3), wherein the circuit is configured to send a reuse indication if the base station maintains a context associated with the network entity.

[0406] (G5) The base station according to (G3) or (G4), wherein the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0407] (G6) The base station of any one of (G3) to (G5), wherein the network entity comprises a network-controlled relay; and

[0408] Among them, the first configuration corresponds to the forwarding function of the repeater controlled by the network.

[0409] (G7) The base station according to (G6) is also configured to: for the radio link failure timer of the network-controlled repeater, configure a duration for detecting a radio link failure that is shorter than the radio link failure timer of a user equipment connected to the network-controlled repeater via a forwarding function.

[0410] (G8) The base station according to any one of (G3) to (G7), wherein the reuse indication is included in a connection re-establishment message.

[0411] (G9) The base station according to (G8), wherein the circuit is further configured to receive a connection re-establishment complete message from the network entity in response to the connection re-establishment message with a reuse indication.

[0412] (G10) The base station of (G8), wherein the circuit is further configured to receive a connection reconfiguration complete message from the network entity in response to the connection reestablishment message with a reuse indication.

[0413] (G11) A base station according to any one of (G8) to (G10), wherein the circuit is further configured to receive a connection re-establishment completion message from the network entity in response to sending a connection re-establishment message that does not include a reuse indication to the network entity.

[0414] (G12) The base station of (G11), wherein the circuit is further configured to send a connection reconfiguration message indicating a second configuration for connecting to the base station to the network entity in response to the connection reestablishment complete message.

[0415] (G13) The base station according to any one of (G1) to (G11), wherein the circuit is further configured to send a connection reconfiguration message to the network entity instead of a connection reestablishment message in response to the connection reestablishment request message;

[0416] The connection reconfiguration message indicates a second configuration for connecting to the base station.

[0417] (G14) The base station according to (G13), wherein the circuit is further configured to:

[0418] Trust network entities; and

[0419] After the network entity is connected to the base station based on the second configuration, other security procedures are performed.

[0420] (G15) A base station according to any one of (G12) to (G14), wherein the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0421] (H1) A method for use in a mobile telecommunications network,

[0422] Wherein, the mobile telecommunication network includes base stations and network entities;

[0423] Among them, the method includes:

[0424] detecting a radio link failure in a connection between a network entity and a cell provided by a base station; and

[0425] A connection re-establishment request message is sent from the network entity to the base station, the connection re-establishment request message including an indication of a radio link failure of the network entity as a re-establishment cause.

[0426] (H2) The method of (H1), wherein the network entity comprises at least one of a network-controlled relay and a user equipment.

[0427] (H3) The method according to (H1) or (H2), further comprising:

[0428] In response to the detected radio link failure, performing cell selection; and

[0429] It is determined that the cell selected in the cell selection is provided by the base station.

[0430] (H4) The method according to (H3), wherein the determination is based on a cell identifier of the selected cell.

[0431] (H5) The method according to any one of (H1) to (H4), further comprising: sending, from the base station to the network entity, a reuse indication for connecting to the base station based on the first configuration of the connection in which the radio link failure has been detected.

[0432] (H6) The method of (H5), wherein the base station sends the reuse indication if the base station maintains the context associated with the network entity.

[0433] (H7) The method according to (H5) or (H6), wherein the first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0434] (H8) The method of any one of (H5) to (H7), wherein the network entity comprises a network-controlled relay; and

[0435] Among them, the first configuration corresponds to the forwarding function of the repeater controlled by the network.

[0436] (H9) A method according to (H8), wherein detection of radio link failure by a network-controlled repeater is based on a radio link failure timer of the network-controlled repeater, wherein the radio link failure timer is configured to indicate a radio link failure after a duration shorter than a radio link failure timer of a user device connected to the network-controlled repeater via a forwarding function.

[0437] (H10) The method according to (H9) also includes: the base station configures a radio link failure timer of the network-controlled relay to have a duration for detecting a radio link failure that is shorter than the radio link failure timer of the user equipment.

[0438] (H11) The method according to any one of (H5) to (H10), wherein the reuse indication is included in a connection re-establishment message.

[0439] (H12) The method according to (H11) further includes: if the network entity receives a connection re-establishment message with a reuse indication, connecting to the base station based on the first configuration.

[0440] (H13) The method according to (H11) or (H12) further includes: sending a connection re-establishment complete message from the network entity to the base station in response to the connection re-establishment message with the reuse indication.

[0441] (H14) The method according to (H11) or (H12) also includes: sending a connection reconfiguration complete message from the network entity to the base station in response to the connection reestablishment message with the reuse indication.

[0442] (H15) The method according to any one of (H11) to (H14), further comprising:

[0443] determining that a connection re-establishment message received by the network entity from the base station does not include a reuse indication; and

[0444] A connection re-establishment complete message is sent from the network entity to the base station.

[0445] (H16) The method according to (H15) also includes: in response to the connection reestablishment complete message, sending a connection reconfiguration message indicating a second configuration for connecting to the base station from the base station to the network entity.

[0446] (H17) The method according to any one of (H1) to (H14), further comprising: sending a connection reconfiguration message instead of a connection reestablishment message from the base station to the network entity in response to the connection reestablishment request message;

[0447] The connection reconfiguration message indicates a second configuration for connecting to the base station.

[0448] (H18) The method according to (H17), further comprising:

[0449] Trusting network entities and base stations; and

[0450] After the network entity is connected to the base station based on the second configuration, other security procedures are performed.

[0451] (H19) A method according to any one of (H16) to (H18), wherein the second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

[0452] (I1) A mobile telecommunication system comprising:

[0453] A base station according to any one of (G1) to (G15); and

[0454] at least one of a network-controlled relay according to any one of (E1) to (E16) and a user equipment according to any one of (F1) to (F14);

[0455] The circuit of the base station and the circuit of at least one of the network-controlled relay and the user equipment are configured to perform the method according to any one of (H1) to (H19).

Claims

1. A network controlled repeater for a mobile telecommunications network, wherein: The network controlled repeater includes circuitry configured to: detecting a radio link failure in a connection between the network controlled repeater and a cell provided by a base station of the mobile telecommunications network; and Based on the detected radio link failure, a first configuration of a forwarding function of the network controlled repeater is released.

2. The network controlled repeater according to claim 1, wherein: Releasing the first configuration includes: deleting the first configuration.

3. The network controlled repeater according to claim 1, wherein: The first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

4. The network controlled repeater according to claim 1, wherein: The circuitry is configured to release the first configuration to accept a second configuration of the forwarding function.

5. The network controlled repeater according to claim 4, wherein: The second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

6. The network controlled repeater according to claim 4, wherein: The circuit is also configured to: responsive to said detected radio link failure, performing cell selection; and It is determined that the cell selected in the cell selection is provided by the base station.

7. The network controlled repeater according to claim 6, wherein: The determination is based on a cell identifier of the selected cell.

8. The network controlled repeater according to claim 6, wherein: The circuit is further configured to send a connection re-establishment request message to the base station.

9. The network controlled repeater according to claim 8, wherein: The circuit is further configured to receive the second configuration from the base station.

10. The network controlled repeater according to claim 9, wherein: The circuit is further configured to request the second configuration from the base station.

11. The network controlled repeater according to claim 10, wherein: The request includes: The request for the second configuration is sent in the connection re-establishment request message.

12. The network controlled repeater according to claim 10, wherein: The request includes: The request for the second configuration is sent in a connection re-establishment complete message.

13. The network controlled repeater according to claim 9, wherein: Receiving includes: The second configuration is received in a connection re-establishment message.

14. The network controlled repeater according to claim 9, wherein: Receiving includes: The second configuration is received in a connection reconfiguration message.

15. The network controlled repeater according to claim 8, wherein: The connection re-establishment request message includes an indication of a radio link failure of the network controlled repeater as a re-establishment cause.

16. The network controlled repeater according to claim 8, wherein: The circuit is also configured to: receiving a connection re-establishment message from the base station; and It is determined whether the connection re-establishment message includes a reuse indication for continuing to provide the forwarding function based on the first configuration.

17. The network controlled repeater according to claim 16, wherein: The circuit is further configured to continue providing the forwarding function based on the first configuration if the connection re-establishment message includes the reuse indication.

18. The network controlled repeater according to claim 16, wherein: The circuit is further configured to receive the second configuration if the connection re-establishment message does not include the reuse indication.

19. The network controlled repeater according to claim 8, wherein: The circuit is further configured to receive a connection reconfiguration message instead of a connection reestablishment message from the base station in response to the connection reestablishment request message.

20. The network controlled repeater according to claim 19, wherein: The circuit is also configured to: trusting the base station; and After the forwarding function is restored, other security procedures are performed.

21. The network controlled repeater of claim 1, wherein: The detection of the radio link failure is based on a radio link failure timer of the network controlled repeater.

22. The network controlled repeater of claim 21, wherein: The radio link failure timer of the network controlled relay is configured to indicate the radio link failure after a shorter duration than a radio link failure timer of a user equipment connected to the network controlled relay via the forwarding function.

23. A base station for a mobile telecommunications network, wherein: The base station comprises circuitry configured to: detecting a radio link failure in a connection between a network controlled repeater of the mobile telecommunications network and a cell provided by the base station; and Based on the detected radio link failure, a first configuration of a forwarding function of the network controlled repeater is released.

24. The base station according to claim 23, wherein: Releasing the first configuration includes deleting the first configuration.

25. The base station according to claim 23, wherein: The first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

26. The base station according to claim 23, wherein: Releasing the first configuration is based on a release timer of the base station.

27. The base station according to claim 26, wherein: The release timer is configured to indicate that the first configuration is released after a time period corresponding to a duration of a radio link failure timer of the network controlled relay.

28. The base station according to claim 23, wherein: The circuit is also configured to receive a connection re-establishment request message from the network-controlled repeater.

29. The base station according to claim 28, wherein: The circuitry is further configured to provide a second configuration of the forwarding functionality to the network-controlled repeater.

30. The base station according to claim 29, wherein: The second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

31. The base station according to claim 29, wherein: The circuit is also configured to receive a request for the second configuration from the network-controlled repeater.

32. The base station according to claim 31, wherein: Receiving includes: A request for the second configuration is received in the connection re-establishment request message.

33. The base station according to claim 31, wherein: Receiving includes: A request for the second configuration is received in a connection re-establishment complete message.

34. The base station according to claim 29, wherein: Offer includes: The second configuration is sent in a connection re-establishment message.

35. The base station according to claim 29, wherein: Offer includes: The second configuration is sent in a connection reconfiguration message.

36. The base station according to claim 28, wherein: The connection re-establishment request message includes an indication of a radio link failure of the network controlled repeater as a re-establishment cause.

37. The base station according to claim 28, wherein: The circuit is further configured to send a reuse indication in a connection re-establishment message to the network-controlled repeater for continuing to provide the forwarding function based on the first configuration.

38. The base station according to claim 37, wherein: The circuitry is configured to send the reuse indication if the base station maintains a user equipment context of a user equipment connected to the network controlled relay according to the first configuration.

39. The base station according to claim 37, wherein: The circuitry is configured to send the reuse indication if the base station maintains a network controlled repeater mobile terminal context for the network controlled repeater according to the first configuration.

40. The base station according to claim 37, wherein: The circuitry is configured to not send the reuse indication if the base station does not maintain a user equipment context for a user equipment connected to the network controlled relay according to the first configuration.

41. The base station according to claim 37, wherein: The circuit is configured to not send the reuse indication if the base station does not maintain a network controlled repeater mobile terminal context for the network controlled repeater according to the first configuration.

42. The base station according to claim 28, wherein: The circuit is further configured to send a connection reconfiguration message instead of a connection reestablishment message to the network-controlled repeater in response to the connection reestablishment request message.

43. The base station according to claim 42, wherein: The circuit is also configured to: trusting the network controlled relays; and After the network controlled repeater resumes providing the forwarding function, other security procedures are performed.

44. The base station according to claim 23, wherein: The circuit is further configured to configure, for a radio link failure timer of the network controlled relay, a shorter duration for detecting a radio link failure than a radio link failure timer of a user equipment connected to the network controlled relay via the forwarding function.

45. A method for a mobile telecommunications network, in, The mobile telecommunications network includes network-controlled repeaters and base stations; Wherein, the method comprises: detecting a radio link failure in a connection between the network controlled repeater and a cell provided by the base station; and Based on the detected radio link failure, a first configuration of a forwarding function of the network controlled repeater is released.

46. ​​The method of claim 45, wherein: Releasing the first configuration includes: deleting the first configuration.

47. The method of claim 45, wherein: The first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

48. The method of claim 45, wherein: Releasing the first configuration at the base station is based on a release timer of the base station.

49. The method of claim 48, wherein: The release timer indicates that the first configuration is released after a time period corresponding to a duration of a radio link failure timer of the network controlled relay.

50. The method of claim 45, wherein: The method includes releasing the first configuration at the network controlled repeater to accept a second configuration of the forwarding function.

51. The method of claim 50, wherein: The second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

52. The method of claim 50, further comprising: responsive to said detected radio link failure, performing cell selection; as well as It is determined that the cell selected in the cell selection is provided by the base station.

53. The method of claim 52, wherein: The determination is based on a cell identifier of the selected cell.

54. The method of claim 52, further comprising: A connection re-establishment request message is sent from the network controlled repeater to the base station.

55. The method of claim 54, further comprising: The second configuration is provided from the base station to the network controlled repeater.

56. The method of claim 55, further comprising: The repeater controlled by the network requests the second configuration from the base station.

57. The method of claim 56, wherein: The request includes: The request for the second configuration is sent in the connection re-establishment request message.

58. The method of claim 56, wherein: The request includes: The request for the second configuration is sent in a connection re-establishment complete message.

59. The method of claim 55, wherein: Offer includes: The second configuration is sent in a connection re-establishment message.

60. The method of claim 55, wherein: Offer includes: The second configuration is sent in a connection reconfiguration message.

61. The method of claim 54, wherein: The connection re-establishment request message includes an indication of a radio link failure of the network controlled repeater as a re-establishment cause.

62. The method of claim 54, further comprising: In a connection re-establishment message from the base station to the network-controlled repeater, a reuse indication for continuing to provide the forwarding function based on the first configuration is sent.

63. The method of claim 62, wherein: The base station sends the reuse indication if the base station maintains a user equipment context of a user equipment connected to the network controlled relay according to the first configuration.

64. The method of claim 62, wherein: The base station sends the reuse indication if the base station maintains a network controlled repeater mobile terminal context of the network controlled repeater according to the first configuration.

65. The method of claim 62, wherein: If the base station does not maintain the user equipment context of the user equipment connected to the network controlled relay according to the first configuration, the base station does not send the reuse indication.

66. The method of claim 62, wherein: If the base station does not maintain a network controlled relay mobile terminal context for the network controlled relay according to the first configuration, the base station does not send the reuse indication.

67. The method of claim 62, further comprising: If the connection re-establishment message includes the reuse indication, the repeater controlled by the network continues to provide the forwarding function based on the first configuration.

68. The method of claim 62, further comprising: If the connection re-establishment message does not include the reuse indication, the second configuration is received.

69. The method of claim 54, further comprising: In response to the connection re-establishment request message, a connection reconfiguration message is sent from the base station to the network-controlled repeater instead of a connection re-establishment message.

70. The method of claim 69, further comprising: trusting the network controlled repeater and the base station; as well as After the network controlled repeater resumes providing the forwarding function, other security procedures are performed.

71. The method of claim 45, wherein: The network controlled repeater detecting the radio link failure is based on a radio link failure timer of the network controlled repeater.

72. The method of claim 71, wherein: Detecting the radio link failure by the network controlled repeater comprises: the radio link failure timer of the network controlled repeater indicating the radio link failure after a duration shorter than a radio link failure timer of a user equipment connected to the network controlled repeater via the forwarding function.

73. The method of claim 72, further comprising: The base station configures, for the radio link failure timer of the network-controlled relay, a duration for detecting a radio link failure that is shorter than the radio link failure timer of the user equipment.

74. A network controlled repeater for a mobile telecommunications network, wherein: The network controlled repeater includes circuitry configured to: detecting a radio link failure in a connection between the network controlled repeater and a cell provided by a base station of the mobile telecommunications network; and A connection re-establishment request message is sent to the base station, the connection re-establishment request message including an indication of a radio link failure of the network controlled repeater as a re-establishment cause.

75. The network controlled repeater of claim 74, wherein: The circuit is also configured to: In response to the detected radio link failure, performing cell selection; and It is determined that the cell selected in the cell selection is provided by the base station.

76. The network controlled repeater of claim 75, wherein: The determination is based on a cell identifier of the selected cell.

77. The network controlled repeater of claim 74, wherein: The circuit is further configured to receive, from the base station, a reuse indication for connecting to the base station based on a first configuration of the connection in which the radio link failure has been detected.

78. The network controlled repeater of claim 77, wherein: The first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

79. The network controlled repeater of claim 77, wherein: The first configuration corresponds to a forwarding function of the network-controlled repeater.

80. The network controlled repeater of claim 79, wherein: Detecting the radio link failure is based on a radio link failure timer of the network controlled repeater, wherein the radio link failure timer is configured to indicate the radio link failure after a duration shorter than a radio link failure timer of a user equipment connected to the network controlled repeater via the forwarding function.

81. The network controlled repeater of claim 77, wherein: The reuse indication is included in a connection re-establishment message.

82. The network controlled repeater of claim 81, wherein: The circuit is further configured to connect to the base station based on the first configuration if the network controlled repeater receives the connection re-establishment message with the reuse indication.

83. The network controlled repeater of claim 81, wherein: The circuit is further configured to send a connection re-establishment complete message to the base station in response to the connection re-establishment message with the reuse indication.

84. The network controlled repeater of claim 81, wherein: The circuit is further configured to send a connection reconfiguration complete message to the base station in response to the connection reestablishment message with the reuse indication.

85. The network controlled repeater of claim 81, wherein: The circuit is also configured to: determining that the connection re-establishment message received from the base station does not include the reuse indication; and Sending a connection re-establishment completion message to the base station.

86. The network controlled repeater of claim 85, wherein: The circuit is further configured to receive, in response to the connection reestablishment complete message, from the base station a connection reconfiguration message indicating a second configuration for connecting to the base station.

87. The network controlled repeater of claim 74, wherein: The circuit is further configured to receive a connection reconfiguration message instead of a connection reestablishment message from the base station in response to the connection reestablishment request message; The connection reconfiguration message indicates a second configuration for connecting to the base station.

88. The network controlled repeater of claim 87, wherein: The circuit is also configured to: trusting the base station; and After connecting to the base station based on the second configuration, other security procedures are performed.

89. The network controlled repeater of claim 87, wherein: The second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

90. A user equipment for a mobile telecommunications network, wherein: The user equipment comprises circuitry configured to: detecting a radio link failure in a connection between the user equipment and a cell provided by a base station of a mobile telecommunications network; and A connection re-establishment request message is sent to the base station, the connection re-establishment request message including an indication of a radio link failure of the user equipment as a re-establishment cause.

91. The user equipment according to claim 90, wherein: The circuit is also configured to: In response to the detected radio link failure, performing cell selection; and It is determined that the cell selected in the cell selection is provided by the base station.

92. The user equipment according to claim 91, wherein: The determination is based on a cell identifier of the selected cell.

93. The user equipment according to claim 90, wherein: The circuit is further configured to receive, from the base station, a reuse indication for connecting to the base station based on a first configuration of the connection in which the radio link failure has been detected.

94. The user equipment according to claim 93, wherein: The first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

95. The user equipment of claim 93, wherein: The reuse indication is included in a connection re-establishment message.

96. The user equipment according to claim 95, wherein: The circuit is further configured to connect to the base station based on the first configuration if the user equipment receives the connection re-establishment message with the reuse indication.

97. The user equipment of claim 95, wherein: The circuit is further configured to send a connection re-establishment complete message to the base station in response to the connection re-establishment message with the reuse indication.

98. The user equipment according to claim 95, wherein: The circuit is further configured to send a connection reconfiguration complete message to the base station in response to the connection reestablishment message with the reuse indication.

99. The user equipment according to claim 95, wherein: The circuit is also configured to: determining that the connection re-establishment message received from the base station does not include the reuse indication; and Sending a connection re-establishment completion message to the base station.

100. The user equipment according to claim 99, wherein: The circuit is further configured to receive, in response to the connection reestablishment complete message, from the base station a connection reconfiguration message indicating a second configuration for connecting to the base station.

101. The user equipment according to claim 90, wherein: The circuit is further configured to receive a connection reconfiguration message instead of a connection reestablishment message from the base station in response to the connection reestablishment request message. The connection reconfiguration message indicates a second configuration for connecting to the base station.

102. The user equipment according to claim 101, wherein: The circuit is also configured to: trusting the base station; and After connecting to the base station based on the second configuration, other security procedures are performed.

103. The user equipment according to claim 101, wherein: The second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

104. A base station for a mobile telecommunications network, wherein: The base station comprises circuitry configured to: detecting a radio link failure in a connection between a network entity of the mobile telecommunication network and a cell provided by the base station; and A connection re-establishment request message is received from the network entity, the connection re-establishment request message including an indication of a radio link failure of the network entity as a re-establishment cause.

105. The base station according to claim 104, wherein: The network entity includes at least one of a network-controlled relay and a user equipment.

106. The base station according to claim 104, wherein: The circuit is further configured to send a reuse indication to the network entity for connecting to the base station based on a first configuration of the connection in which the radio link failure has been detected.

107. The base station according to claim 106, wherein: The circuitry is configured to send the reuse indication if the base station maintains a context associated with the network entity.

108. The base station according to claim 106, wherein: The first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

109. The base station according to claim 106, wherein: The network entity comprises a network controlled repeater; and The first configuration corresponds to the forwarding function of the network-controlled repeater.

110. The base station according to claim 109 is also configured to configure a radio link failure timer for the network-controlled repeater, and a duration for detecting a radio link failure that is shorter than the radio link failure timer of a user equipment connected to the network-controlled repeater via the forwarding function.

111. The base station according to claim 106, wherein: The reuse indication is included in a connection re-establishment message.

112. The base station according to claim 111, wherein: The circuit is further configured to receive a connection re-establishment complete message from the network entity in response to the connection re-establishment message with the reuse indication.

113. The base station according to claim 111, wherein: The circuitry is further configured to receive a connection reconfiguration complete message from the network entity in response to the connection reestablishment message with the reuse indication.

114. The base station according to claim 111, wherein: The circuit is further configured to, in response to sending the connection re-establishment message that does not include the reuse indication to the network entity, receive a connection re-establishment complete message from the network entity.

115. The base station according to claim 114, wherein: The circuit is further configured to send, in response to the connection re-establishment complete message, to the network entity a connection reconfiguration message indicating a second configuration for connecting to the base station.

116. The base station according to claim 104, wherein: The circuit is further configured to send a connection reconfiguration message instead of a connection reestablishment message to the network entity in response to the connection reestablishment request message; The connection reconfiguration message indicates a second configuration for connecting to the base station.

117. The base station according to claim 116, wherein: The circuit is also configured to: trusting the network entity; and After the network entity is connected to the base station based on the second configuration, other security procedures are performed.

118. The base station according to claim 116, wherein: The second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

119. A method for a mobile telecommunications network, in, The mobile telecommunication network comprises a base station and a network entity; Wherein, the method comprises: detecting a radio link failure in a connection between the network entity and a cell provided by the base station; and A connection re-establishment request message is sent from the network entity to the base station, the connection re-establishment request message including an indication of a radio link failure of the network entity as a re-establishment cause.

120. The method of claim 119, wherein: The network entity includes at least one of a network-controlled relay and a user equipment.

121. The method of claim 119, further comprising: performing cell selection in response to a detected radio link failure; as well as It is determined that the cell selected in the cell selection is provided by the base station.

122. The method of claim 121, wherein: The determination is based on a cell identifier of the selected cell.

123. The method of claim 119, further comprising: A reuse indication is sent from the base station to the network entity for connecting to the base station based on a first configuration of the connection in which the radio link failure was detected.

124. The method of claim 123, wherein: The base station sends the reuse indication if the base station maintains the context associated with the network entity.

125. The method of claim 123, wherein: The first configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

126. The method of claim 123, wherein: The network entity comprises a network controlled repeater; and The first configuration corresponds to the forwarding function of the repeater controlled by the network.

127. The method of claim 126, wherein: The network controlled repeater detects the radio link failure based on a radio link failure timer of the network controlled repeater, wherein the radio link failure timer is configured to indicate the radio link failure after a duration shorter than a radio link failure timer of a user equipment connected to the network controlled repeater via the forwarding function.

128. The method of claim 127, further comprising: The radio link failure timer of the network-controlled relay is configured by the base station with a shorter duration for detecting a radio link failure than the radio link failure timer for the user equipment.

129. The method of claim 123, wherein: The reuse indication is included in a connection re-establishment message.

130. The method of claim 129, further comprising: If the network entity receives the connection re-establishment message with the reuse indication, it connects to the base station based on the first configuration.

131. The method of claim 129, further comprising: In response to the connection re-establishment message with the reuse indication, a connection re-establishment complete message is sent from the network entity to the base station.

132. The method of claim 129, further comprising: In response to the connection re-establishment message with the reuse indication, a connection reconfiguration complete message is sent from the network entity to the base station.

133. The method of claim 129, further comprising: determining that a connection re-establishment message received by the network entity from the base station does not include the reuse indication; as well as A connection re-establishment complete message is sent from the network entity to the base station.

134. The method of claim 133, further comprising: In response to the connection re-establishment complete message, a connection reconfiguration message indicating a second configuration for connecting to the base station is sent from the base station to the network entity.

135. The method of claim 119, further comprising: In response to the connection reestablishment request message, sending a connection reconfiguration message instead of a connection reestablishment message from the base station to the network entity; The connection reconfiguration message indicates a second configuration for connecting to the base station.

136. The method of claim 135, further comprising: trusting the network entity and the base station; as well as After the network entity is connected to the base station based on the second configuration, other security procedures are performed.

137. The method of claim 135, wherein: The second configuration includes at least one of a beam configuration, an on / off configuration, and a time division multiplexing configuration.

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