JPWO2019215381A5 - - Google Patents

Description

Cross-reference of related applications

This application claims the benefit of US Patent Application No. 62 / 669,719, filed May 10, 2018, which is incorporated herein by reference in its entirety.

Certain embodiments may relate to wireless communication systems. For example, some embodiments may relate to beamforming techniques for secondary cells.

Explanation of background technology

Due to beam failure recovery technology for the primary cell, User Equipment (UE) is either Contention-Free Random Access (CFRA) or Contention-Based Random Access (CBRA). ) Etc. (Random Access Channel: RACH) procedure may be started. Beam failure recovery techniques, also known as link reconfiguration, can recover lost link connections. For example, a beam failure recovery procedure may detect that one or more serving control channel (PDCCH) links are in a failed state and seek recovery. To recover a failed PDCCH link, the UE may send a signal to the network to indicate the link failure and the alternative link .

However, there is a problem in beam failure recovery techniques with reference signals between carriers in which the primary cell and one or more secondary cells operate on different beam failure detection reference signals.

Description

A method according to an embodiment may include the user equipment determining that the beam failure in the secondary cell is at least determined by the medium access control layer. The method may further include the user equipment determining one or more other secondary cell candidates based on at least candidate beam measurements of the primary cell. The method may further include the user equipment transmitting one or more data packets associated with one or more selected other secondary cell candidates.

A method according to an embodiment may include receiving a sign of failure of a primary cell and / or a secondary cell by a network entity. In this method, the network entity determines a user equipment spatial receive filter for receiving a response to beam failure recovery in the secondary cell in response to receiving a control element of secondary cell beam failure recovery medium access control. May be further included. The method may further include the network entity selecting candidate beam measurements from the physical layer of the secondary cell.

A method according to an embodiment may include making one or more measurements of one or more serving cells by a user device. The one or more serving cells are primary and / or secondary serving cells. The method may further include receiving from the network a channel state information reference signal resource index, one or more synchronization signals / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurements. The one or more corresponding reference signal measurement results include one or more of the reference signal received power, the received power measurement value, the reference signal reception quality, the virtual block error rate, and the signal-to-interference + noise ratio. The method further comprises monitoring the physical downlink control channel of the secondary cell for receiving downlink control information based on transmitted measurement results or markings based on the obtained measurement results. good. The method may further include reporting the one or more channel state information reference signal resource index, one or more sync signal / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurement results. ..

A device according to an embodiment may include means for determining that the secondary cell beam failure is at least determined by the medium access control layer. The apparatus may further comprise means for determining one or more other secondary cell candidates based on at least candidate beam measurements of the primary cell. The device may further comprise means for transmitting one or more data packets associated with one or more other selected secondary cell candidates.

A device according to an embodiment may include means for receiving a failure indication of a primary cell and / or a secondary cell. The apparatus may further comprise means for determining a user equipment spatial receive filter for receiving a response to beam failure recovery in said secondary cell in response to receiving a control element of secondary cell beam failure recovery medium access control. good. The apparatus may further include means for selecting candidate beam measurements from the physical layer of the secondary cell.

A device according to an embodiment may include means for making one or more measurements of one or more serving cells. The one or more serving cells are primary and / or secondary serving cells. The device may further comprise means for receiving from the network a channel state information reference signal resource index, one or more synchronization signals / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurement results. The one or more corresponding reference signal measurement results include one or more of the reference signal received power, the received power measurement value, the reference signal reception quality, the virtual block error rate, and the signal-to-interference + noise ratio. The apparatus further comprises means for monitoring the physical downlink control channel of the secondary cell for receiving downlink control information based on transmitted measurement results or receiving markings based on the obtained measurement results. May be good. The device may further comprise one or more channel state information reference signal resource indexes, one or more sync signal / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurement results. good.

A device according to an embodiment may include at least one processor and at least one memory containing computer program code. The computer program code is configured to, when executed by the at least one processor, cause the device to determine at least that the secondary cell beam failure is determined by at least the medium access control layer. May be good. When the computer program code is executed on the at least one processor, the device further performs to determine one or more other secondary cell candidates based on at least the candidate beam measurements of the primary cell. It may be configured to cause. The computer program code, when executed on the at least one processor, further implements sending to the device at least one or more data packets associated with one or more selected other secondary cell candidates. It may be configured to cause.

A device according to an embodiment may include at least one processor and at least one memory containing computer program code. The computer program code may be configured to cause the device to receive at least a primary cell and / or a secondary cell failure indication when executed by the at least one processor. When the computer program code is executed on the at least one processor, the device is at least responsive to beam failure recovery in the secondary cell in response to receiving a control element of the secondary cell beam failure recovery medium access control. It may be configured to further determine the user equipment spatial receive filter for reception. The computer program code may be configured to, when executed by the at least one processor, further cause the device to select at least a candidate beam measurement from the physical layer of the secondary cell.

A device according to an embodiment may include at least one processor and at least one memory containing computer program code. The computer program code may be configured to, when executed by the at least one processor, cause the device to perform one or more measurements of at least one or more serving cells. The one or more serving cells are primary and / or secondary serving cells. When the computer program code is executed on the at least one processor, the device has at least a channel state information reference signal resource index, one or more synchronization signals / physical broadcast channel configuration indexes, and one or more from the network. It may be configured to further perform receiving the corresponding reference signal measurement result of. The one or more corresponding reference signal measurement results include one or more of the reference signal received power, the received power measurement value, the reference signal reception quality, the virtual block error rate, and the signal-to-interference + noise ratio. When the computer program code is executed on the at least one processor, at least for receiving downlink control information based on the measurement result transmitted to the device, or for receiving a sign based on the obtained measurement result. , The secondary cell may be configured to further monitor the physical downlink control channel. When the computer program code is executed on the at least one processor, the device has at least one or more channel state information reference signal resource indexes, one or more synchronization signals / physical broadcast channel setting indexes, and one. It may be configured to further perform reporting of one or more corresponding reference signal measurements.

A computer program according to an embodiment may embody the following method when executed by a hardware processing means. This method may determine that the secondary cell beam failure is at least determined by the medium access control layer. The method may further determine one or more other secondary cell candidates based on at least candidate beam measurements of the primary cell. The method may further transmit one or more data packets associated with one or more selected other secondary cell candidates.

A computer program according to an embodiment may embody the following method when executed by a hardware processing means. This method may receive a failure indication of the primary cell and / or the secondary cell. The method may further determine a user equipment spatial receive filter for receiving a response to beam failure recovery in the secondary cell in response to receiving a control element of secondary cell beam failure recovery medium access control. This method may further select candidate beam measurements from the physical layer of the secondary cell.

A computer program according to an embodiment may embody the following method when executed by a hardware processing means. This method may make one or more measurements of one or more serving cells. The one or more serving cells are primary and / or secondary serving cells. The method may further receive from the network a channel state information reference signal resource index, one or more sync signals / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurements. The one or more corresponding reference signal measurement results include one or more of the reference signal received power, the received power measurement value, the reference signal reception quality, the virtual block error rate, and the signal-to-interference + noise ratio. The method may further monitor the physical downlink control channel of the secondary cell for receiving downlink control information based on transmitted measurement results or for receiving markings based on the obtained measurement results. The method may further report the one or more channel state information reference signal resource index, one or more sync signal / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurement results.

A computer program product according to an embodiment may embody the following method. This method may determine that the secondary cell beam failure is at least determined by the medium access control layer. The method may further determine one or more other secondary cell candidates based on at least candidate beam measurements of the primary cell. The method may further transmit one or more data packets associated with one or more selected other secondary cell candidates.

A computer program product according to an embodiment may embody the following method. This method may receive a failure indication of the primary cell and / or the secondary cell. The method may further determine a user equipment spatial receive filter for receiving a response to beam failure recovery in the secondary cell in response to receiving a control element of secondary cell beam failure recovery medium access control. This method may further select candidate beam measurements from the physical layer of the secondary cell.

A computer program product according to an embodiment may embody the following method. This method may make one or more measurements of one or more serving cells. The one or more serving cells are primary and / or secondary serving cells. The method may further receive from the network a channel state information reference signal resource index, one or more sync signals / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurements. The one or more corresponding reference signal measurement results include one or more of the reference signal received power, the received power measurement value, the reference signal reception quality, the virtual block error rate, and the signal-to-interference + noise ratio. The method may further monitor the physical downlink control channel of the secondary cell for receiving downlink control information based on transmitted measurement results or for receiving markings based on the obtained measurement results. The method may further report the one or more channel state information reference signal resource index, one or more sync signal / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurement results.

A device according to an embodiment may comprise a circuit body configured to determine that the secondary cell beam failure is at least determined by the medium access control layer. The circuit may further determine one or more other secondary cell candidates based on at least candidate beam measurements of the primary cell. The circuit may further transmit one or more data packets associated with one or more selected other secondary cell candidates.

A device according to an embodiment may comprise a circuit body configured to receive a failure indication of a primary cell and / or a secondary cell. The circuit may further determine a user equipment spatial receive filter for receiving a response to beam failure recovery in the secondary cell in response to receiving a control element of secondary cell beam failure recovery medium access control. The circuit body may further select a candidate beam measurement value from the physical layer of the secondary cell.

A device according to an embodiment may comprise a circuit body configured to make one or more measurements of one or more serving cells. The one or more serving cells are primary and / or secondary serving cells. The circuit may further receive from the network a channel state information reference signal resource index, one or more sync signals / physical broadcast channel configuration indexes, and one or more corresponding reference signal measurements. The one or more corresponding reference signal measurement results include one or more of the reference signal received power, the received power measurement value, the reference signal reception quality, the virtual block error rate, and the signal-to-interference + noise ratio. The circuit body may further monitor the physical downlink control channel of the secondary cell for receiving the downlink control information based on the transmitted measurement result or the indication based on the obtained measurement result. .. The circuit may further report the one or more channel state information reference signal resource index, one or more synchronization signal / physical broadcast channel setting indexes, and one or more corresponding reference signal measurement results.

Please refer to the attached figure below for a correct understanding of this disclosure.
An example of the system which concerns on a specific embodiment is shown. An example of a method implemented by a user device according to a specific embodiment is shown. An example of a method implemented by a network entity according to a particular embodiment is shown. An example of a method for link resetting performed by a user device according to a specific embodiment is shown. An example of the system which concerns on a specific embodiment is shown.

Detailed explanation

The properties, configurations, or features of the particular embodiments described throughout this specification may be combined in any way in one or more embodiments. For example, "specific embodiments," "partial embodiments," "another embodiment," or similar expressions described throughout the specification are specific embodiments described in connection with such embodiments. It is shown that the characteristics, configurations, or characteristics of the above may be included in at least one embodiment of the present invention. Accordingly, "specific embodiments," "partial embodiments," "another embodiments," or similar expressions described throughout the specification necessarily indicate the same group of embodiments. Rather, the described properties, configurations, or features may be combined in any suitable form in one or more embodiments.

The particular embodiments described herein can provide significant technical advantages. For example, certain embodiments may avoid panel activity delays when the network presents the hypothesized candidate as a new Transmission Configuration Indication (TCI) state. In addition, secondary cell signaling is used to send a MAC CE that confirms that the link is available and that the primary cell must be used to authenticate the control element (CE) of the medium access control (MAC). Can be used.

If the network determines that the user equipment is not currently aligned or activates the PDCCH TCI state (for example, the alignment does not correspond to the new TCI state indicated by the network), the network uses the primary cell downlink, The new TCI status may be signaled to the user equipment.

For example, in the example shown in FIG. 1, in the failed state, the secondary cell does not have a sync signal block in the failed state based on the channel state information reference signal (CSI-RS), and the UE is new in the secondary cell. No CSI-RS candidates can be shown. Since the secondary cell does not have a synchronization signal block, the user equipment cannot assume a fallback candidate due to the periodic signal unique to the transmitted secondary cell. In this example, in a dual connectivity situation, it is assumed that the primary secondary cell of the primary cell, master cell group, or secondary cell group is available for the secondary recovery procedure. In such a communication system, a base station such as an evolved node B (eNB), a next generation node B (gNB), or other network entity may be responsible for communication with the user equipment.

When the primary cell and the secondary cell are operating at the same frequency and band, the new radio (NR) technology can configure carrier aggregation in which the secondary cell does not transmit a sync signal block. Synchronization Signal Block (SSB) and Synchronization Signal / Physical Broadcast Channel (SS / PBCH) blocks include PSS and SSS signals. Physical broadcast channels include PBCH and DMRS. Further, the SSB may carry a cell identifier (Physical Cell ID (PCI)), and a specific SSB of a cell can be identified based on the SSB index or SSB resource index, or the SSB time position index. The CSI-RS configuration for beam management of the primary and secondary cells is performed between component carriers that do not transmit a sync signal block in the secondary cell, using the primary cell sync signal block for spatial and / or other types of QCL references. Can be.

CSI-RS can be set for UE carriers, especially if the PDCCH-TCISTate setting is carrier-specific. As a result, the network can set each cell / carrier without duplication of PDCCH-TCISTate. This provides a beam failure detection resource that can be referred to as a set of q _0s . This set may include SSB and / or CSI-RS resource indexes that do not overlap between cells. That is, q _{0_PCell} ! = Q _{0_S Cell} . Here, q _{0_PCell} indicates a PCell failure detection resource, q _{0_SCell} indicates a SCell failure detection resource, and the implicit setting of q ₀ is based on PDCCH beam marking. Similarly, the failure detection resources of PCell and _SCell may differ depending on the explicit q0 setting. For example, different PDCCH beam / TCI states are used for PCell and SCell. In some embodiments, the failure detection resources of the two serving cells (SCell or PCell) can be different. Therefore, the primary cell failure does not automatically correspond to the secondary cell failure.

As an example, FIG. 2 shows a method performed by a user device such as the user device 510 of FIG. In step 201, the user equipment may determine in the medium access control layer (and other layers are not excluded) that a secondary cell beam failure has occurred. In step 203, the user equipment may perform a candidate beam measurement with a secondary cell downlink reference signal , eg, a CSI-RS and SS / PBCH block (beam specific measurement) . Candidate beam measurements may include L1 measurements such as RSRP, RSRQ, SINR, virtual PDCCH BLER, or other L1 measurements. In some embodiments, the physical layer of the user equipment may perform candidate beam measurements with a secondary cell signal such as an SSB. In step 205, the user device may determine that there are no candidates available in the secondary cell and that the primary cell is not in a failed state. If the primary cell is in a failed state, the UE may prioritize recovery of the primary cell first. In step 207, the user equipment may determine one or more other candidate beams in the secondary cell, at least based on the candidate beam measurements in the primary cell. At step 209, the user equipment may determine if non-competitive random access (CFRA) resources are available for beam failure recovery corresponding to one or more candidate beams in the secondary cell. .. In step 211, the user equipment may select one or more non-competitive random access resources depending on the determination that the non-competitive random access resources corresponding to one or more secondary cell candidates are available. .. At step 213, the user equipment may transmit one or more markings of one or more selected other secondary cell candidate beams. These CFRA signals may be mapped to a SCell uplink signaling resource or a PCell signaling resource (or any serving cell uplink resource).

FIG. 3 shows a method performed on a network entity such as network entity 520 and / or network entity 530 in FIG. At step 301, the network entity may receive a failure sign. In some embodiments, this failure indication may indicate a secondary cell beam failure. In another embodiment, the failure indication may include a control element of medium access control indicating one or more new candidate resources of the failed secondary cell. In step 303, in response to receiving the control element of the secondary cell beam failure recovery medium access control, the network entity may determine the user equipment spatial receive filter to receive the response to the beam failure recovery in the secondary cell. ..

In step 305, the network entity may select one or more primary cells and one or more secondary cells for transmitting the new transmission setting display state setting (for PDCCH). In various embodiments, if the sync signal block index is indicated by the UE as a new candidate beam, the network entity may provide the channel state information reference signal setting corresponding to the sync signal block. In this way, the network can initiate beam refinement based on the SS block candidates indicated by the UE. Alternatively, the UE may indicate CSI-RS and the network may initiate beam refinement by setting additional reference signals corresponding to the improved beam. Beam improvement indicates a procedure in which the UE is required to provide feedback on measurements for a better or narrower beam (typically with higher beamforming gain but narrower spatial coverage). This can improve the communication quality.

FIG. 4 shows another example of a method performed by a user device such as the user device 510 of FIG. In some embodiments, the method described in FIG. 4 may be performed in combination with the method described in FIG. In step 401, the user device may perform candidate beam measurements on one or more primary cells such as network entity 520 and / or secondary cells such as network entity 530. In one example, the MAC layer of a user device may require the PHY (physical layer) to perform the measurement for a particular signal. Alternatively, without request, the PHY performs the measurement. That is, when the measurement result is obtained for a specific signal, the UE executes the measurement on the detected signal.

In step 403, the user device reports measurements for one or more primary and / or secondary cells to one or more of the serving cells (eg, PCell and / or one or more SCell), or each. May be good. In some embodiments, this report is one or more channel state information reference signal resource indexes, one or more sync signal / physical broadcast channel resource indexes, and one or more corresponding reference signal received power measurements (L1-). RSRP, RSRP, etc.) may be included. Measurements may also be performed using MAC control elements or RRC sigling. Measured quantity The measured value may include RSRP, RSRQ, virtual PDCCH BLER, SINR and the like.

In some embodiments, the user equipment fails, depending on the determination that the user equipment does not have an available secondary cell candidate signal (such as when indicated using CFRA sigling or MAC CE). It may provide one or more measurements of a primary cell reference signal with a pseudo-co-locating assumption between carriers associated with a secondary cell. The pseudo-same position may be a spatial RX assumption. That is, when the UE determines a signal having a spatial RX assumption for the SCell (or any serving cell based on another serving cell) to be received in the same RX beam as the PCell. Other types of QCL are not excluded. If the signals share the same QCL assumptions with each other, it means that they share the same indication characteristics such as delay spread, Doppler spread, Doppler shift, average delay, and / or spatial reception parameters. As an example, if the signal has a spatial RX QCL assumption, it means that the UE can assume the same RX beam (RX spatial filter setting) when receiving the signal. The determination of the spatial RX filter setting may be based on the indicated resource for the beam failure recovery request and / or the selected resource indication by the upper layer (ie, the MAC indicates to the PHY layer which resource was selected). ..

In some embodiments, SCell beam failure may be detected based on one or more CSI-RS configured as BFD-RS. Failure such that the PCell and / or SCell with a valid uplink connection associated with the failed SCell is not in a failed state and there is no suitable CSI-RS candidate beam on the SCell (ie, undetectable). Can be detected. The UE may detect a SCell beam failure based on the CSI-RS in the q ₀ SCell set, and the UE cannot explicitly indicate any new candidate beam by CSI-RS measurement on the SCell. This may allow the UE to assume a spatial QCL for the PCell SSB and / or CSI-RS signals of one or more SCells and use one or more techniques to determine one or more SCell candidates. .. This will be described later.

For example, for a PDCCH for a PCell, if the SSB (SS / PBCH block) currently configured as a valid TCISTate is determined to have an intercarrier space QCL of the failed SCell, the UE selects that SSB as a candidate. May be marked. If multiple SSBs are configured as TCISTates for PDCCH, the UE may select the SSB with the highest signal quality based on the measurements.

In another example, if the intercarrier spatial QCL is determined to be a CSI-RS configured as a valid TCISTate for the PCell's PDCCH, the UE may select the corresponding SSB as a new candidate based on the QCL determination. In this example, the SSB may be set as a source QCL reference for the CSI-RS. That is, it is a case of sharing the same indicated QCL parameter such as a spatial RX.

Another exemplary situation is when an intercarrier spatial QCL is assumed for an SSB configured as a valid TCISTate for the PCell's PDCCH and there is a spatial QCL associated with the CSI-RS resource in the PCell. .. In this example, the UE may select one or more combinations of SSB and CSI-RS available. This SSB / CSI-RS group shares the same spatial QCL assumptions as the PCell, depending on the L1-RSRP aggregated between the QCL SSB and CSI-RB resources within the group. The aggregated L1-RSRP can consist of both SSB and CSI-RS RSRP measurements in the same group.

Further, if the intercarrier spatial QCL is assumed for the CSI-RS currently set as the effective TCISTatePDCCH of the PCell, the UE may select the corresponding SS block as a new candidate according to the QCL assumption.

Finally, the SCell detects a beam failure, an intercarrier spatial QCL is assumed for the PCell SS block (or a serving cell with an uplink to the beam failure recovery signaling), and one or more corresponding to the failed CSI-RS beam. If the SS block of is above one or more thresholds such as TH1, one or more SS blocks may be selected as new candidates and shown to the network. In some embodiments, the threshold may be fixed or may respond to a particular SS block set as an effective TCISTatePDCCH or through a QCL. This exemplary threshold can be set by the network. TH1 can also be a candidate beam threshold set for the CFRA BFR, or can be a TH set in the RACH procedure for selecting the appropriate SS block for random access. Another threshold is not excluded. Multiple SSBs may be shown on the network. Also, for the spatial RX assumption for the failed SCell (the UE sets the RX spatial filter for the SCell according to the RX assumption of the SSB on the PCell), the UE selects the best reported SSB. You may. In this case, only one selected SSB is shown as a candidate. The above method may be applied to CSI-RS signals as well.

Finally, if the SCell detects a beam failure, an intercarrier spatial QCL is assumed for the SS block, and the SS block corresponding to the failed CSI-RS beam exceeds one or more thresholds, such as TH1, the SS block. Can be selected as a new candidate. In some embodiments, the threshold may be fixed or may depend on the signal level of a particular SS block configured as an effective TCISTatePDCCH or through a QCL. Thus, the threshold may depend on a particular SSB (eg, where the network can set a relative offset, such as X dB / mW relative to a particular SSB signal level) or an absolute value set by the network.

In some embodiments, the UE receive spatial filter is spatially configured by SCell's PDCCH DMRS with a selected PCell SS block, CSI-RS, and / or SS block of the indicated CSI-RS through spatial QCL assumptions. Can be configured to assume pseudo-same position.

In step 405, the user equipment receives downlink control information in response to the user equipment exhibiting one or more channel state information reference signal resources and / or synchronization signals / physical broadcast channel block indexes from the primary cell. Monitor the secondary cell physical downlink control channel for. Downlink control information can be transmitted using a UE-specific identifier for the secondary cell (eg, a cyclic redundancy check scrambled with a wireless network temporary identifier). The UE may start monitoring the network response to the candidate marking (eg, starting after the next slot or N slot after sending the marking, or starting after the next PDCCH monitoring after marking the recovery request, or Response monitoring may take into account the NW configuration delay . In one example, this delay is indicated as an antenna panel activation delay, i.e., after marking, the UE takes K milliseconds before SCell can be received. ) Based on the reference signal (candidate beam), the UE tells the SCell a selected periodic channel state information reference for one or more of the delay spread, Doppler spread, Doppler shift, average delay, and / or spatial reception parameters. It can be assumed that the demodulation reference signal antenna port is associated with PDCCH reception in the UE-specific search space if it is quasi-coordinated with the signal resource or sync signal / physical broadcast channel block index. In some embodiments, signals that share the same QCL assumptions with each other may share one or more characteristics such as delay spreads, Doppler spreads, Doppler shifts, average delays, and / or spatial reception parameters.

In some embodiments, in response to a SCell failure, the user equipment makes a pseudo-coordinate assumption prior to beam failure before presenting the network with one or more channel state information reference signals or SS blocks as new candidate beams. PDCCH can be monitored.

In step 407, the user equipment is in the antenna port pseudo-coordinate position to monitor the PDCCH on the primary or secondary cell until the user equipment receives the TCI-Status enablement for the TCI state and / or PDCCH parameters. Assume that the parameter is valid. In step 409, upon receiving the PDCCH, the user equipment has the same antenna port pseudo-coordinate parameter for PDCCH monitoring until the user equipment receives TCI-States enablement for the TCI state and / or PDCCH parameter from the upper layer. Can be used.

In one embodiment, one or more non-competitive preambles for one or more secondary cells may be secured on the primary cell or secondary cell uplink. In the serving cell uplink, the serving cell can be another PCell in dual connectivity (also referred to as SpCell). This can be referred to as the physical random access channel of the preamble resource (PRACH resource set). The reserved preamble can be mapped to a sync signal block / CSI-RS with a Quasi Co-Location (QCL) assumption for the failed secondary cell. In some embodiments, signals that share the same QCL assumptions with each other may share one or more characteristics such as delay spreads, Doppler spreads, Doppler shifts, average delays, and / or spatial reception parameters.

In one embodiment, the UE may be configured with a CFRA (Non-Competitive Random Access) signal solely for the purpose of indicating a SCell failure. In this case, the failure indicated implies that the UE assumes the current TCISTate of the PDCCH (either SSB, CSI-RS, or SSB through the CSI-RS QCL assumption) for the SCell candidate. If the UE has only one TCI state for the PDCCH, the candidate (with respect to the spatial QCL assumption for reception on the SCell) is implied to be that TCI state. If the PDCCH has more than one TCI state, the CFRA signal may be unique to the TCI state. Further, if the UE assumes the same spatial QCL assumption for a signal between one or more component carriers or bands, the UE receives the signal at each component carrier for which the QCL assumption holds, but the same spatial filter. Can be used. Similarly, if two signals, such as a CSI-RS, share a spatial RX QCL assumption, the UE may assume the same spatial reception filter, such as an RX beam, for reception of both signals. Further, the UE may determine one or more characteristics of one or more signals based on another signal when the QCL is indicated by a Doppler spread or the like. The mapping may be done directly on the reference signal or through the CSI-RS QCL assumptions currently set for the primary PDCCH-TCISTate.

In another embodiment, the user equipment may use MAC CE to indicate that the secondary cell has failed and there is no valid candidate beam to show on the secondary cell. In another embodiment, the user equipment uses a SCell candidate beam to indicate one or more primary cell sync signal blocks that exceed the first threshold and is the highest reported SSB (SSB resource index, or SSB time position index). , Each signal quality measurement is also possible) may be selected as a candidate and the receive space filter may be set according to the highest reported SSB block RX direction. In some embodiments, the threshold TH1 can be a network configuration candidate beam selection threshold such as SS / PBCH block (SSB) signal quality including RSRP, RSRQ, SINR. In some embodiments, the UE may consider the SSB as a potential beam failure recovery candidate if the candidate beam selection exceeds the threshold. If the user equipment showed multiple candidates by MAC CE sigling, the user equipment was used to receive the highest reported SSB index of the primary cell SS block, i.e. the primary cell SSB, for SCell PDCCH reception. It may be assumed that a spatial filter corresponding to the same RX beam / spatial filter setting as is used for receiving PDCCH on the SCell. Alternatively, the signal of the above-described embodiment may also be a CSI-RS signal. The user equipment may prioritize a particular non-competitive recovery resource if the corresponding downlink reference signal exceeds a predetermined threshold. However, if not available, the user device switches to MAC CE based on the secondary cell failure indication and the new candidate, if any. MAC CEs are used as described above to indicate SCell candidates using measurements on the PCell signal when the PCell signal has an intercarrier QCL assumption, as described herein. obtain.

FIG. 5 shows an example of a system according to a particular embodiment. In one embodiment, the system may include a plurality of devices such as, for example, user equipment 510, network entity 520, and network entity 530. The network entity 520 and the network entity 530 may be the primary serving cell and / or the secondary serving cell, respectively.

The network entity 520 and the network entity 530 are base stations such as evolved node B (eNB) or next generation node B (gNB), next-generation radio access networks (NG RAN), and serving gateways. , Server, and / or any other access node, or one or more of these combinations. In addition, a citizen broadband radio service (CBRS) device (CBSD) may include one or more serving cells such as network entity 520 and network entity 530. The UE 510 includes mobile phones, smartphones, personal digital assistants (PDAs), tablets, portable media players, digital cameras, pocket video cameras, video game machines, Global Positioning System (GPS) devices, and the like. It may be equipped with a single location device such as a navigation unit, a desktop or notebook computer, a sensor or a smart meter, or one or more mobile devices such as any combination thereof.

One or more of these devices may include at least one processor, designated as 511, 521, 513, respectively. At least one memory may be provided to one or more devices designated as 512, 522, 532. The memory may be fixed or removable. The memory may contain internally stored computer program instructions or computer code. Processors 511, 521, 513 and memories 512, 522, 532, or subsets thereof, may be configured to provide means corresponding to the various blocks of FIGS. 1-4. Although not shown, the device may further include positioning hardware such as GPS or Micro Electrical Mechanical System (MEMS) hardware used to determine its position. Further, other sensors may be provided to determine the position, altitude, direction, etc., and examples thereof include a barometer, a compass, and the like.

As shown in FIG. 5, transceivers 513, 523, 533 may be provided and one or more devices may further include at least one antenna, designated as 514, 524, 534, respectively. The device may have a large number of antennas, such as an array of antennas configured for Multiple Input Multiple Output (MIMO) communication, or multiple antennas for multiple wireless access technologies. For example, other configurations of these devices may be further provided.

The transmitter / receiver 513, 523, 533 may be a transmitter, a receiver, both a transmitter and a receiver, or a unit or device that may be configured for transmission and reception.

Processors 511, 521, and 513 are implemented by any computational or data processing device, such as a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or an equivalent device. May be done. The processor may be implemented as a single controller or as multiple controllers or processors.

The memories 512, 522, and 532 may be independently any suitable storage device such as a non-temporary computer-readable medium. A hard disk drive (HDD), random access memory (RAM), flash memory, or other suitable memory may be used. These memories may be combined with one integrated circuit as a processor, or may be provided separately from one or more processors. In addition, computer program instructions that are stored in memory and can be processed by the processor take the form of any suitable computer program code, such as a compiled or integrated computer program written in any suitable programming language. May be good. The memory may be removable or non-detachable.

Computer program instructions are configured to cause a hardware device, such as a user device, to perform one of the processes described below (eg, see FIGS. 1 to 4) by means of a processor for an individual device. May be good. Thus, in certain embodiments, non-temporary computer-readable media, when implemented in hardware, may be encoded by computer instructions that perform processes such as one of the processes described herein. Alternatively, certain embodiments may be implemented entirely in hardware.

In certain embodiments, the device may comprise a circuit body configured to perform any of the processes or functions shown in FIGS. 1-4. For example, the circuit body may be a hardware-only circuit implementation such as an analog and / or digital circuit body. In another example, the circuit body is a hardware processor (s) comprising a combination of analog and / or digital hardware circuits (s) and software or firmware, and / or software (including a digital signal processor (s)). Possible) Any part of the hardware circuit and software, such as any part of the software, any part of at least one memory that works together to cause the device to perform various processes or functions. You may. In yet another example, the circuit body may be a hardware circuit (s) or processor (s), such as a microprocessor (s) or a portion thereof, including software such as firmware for operation. good. The software in the circuit may not be present when it is not necessary for the hardware to operate.

Those skilled in the art will readily appreciate that certain embodiments described above may be implemented in out-of-order steps and / or on hardware elements in configurations different from those disclosed. You will understand. Therefore, it will be obvious to those skilled in the art that a particular modification, modification, or alternative structure will be apparent without departing from the gist and scope of the invention. Therefore, in order to define the scope of the present invention, please refer to the appended claims.

Part of the term 3GPP (3rd Generation Partnership Project) 3rd Generation Partnership Project BFD-RS (Beam Failure Detection Reference Signal) Beam Failure Detection Reference Signal BFR (Beam Failure Recovery) Beam Failure Recovery BFRQ (Beam Failure Recovery Request) Beam Failure Recovery Request Request BLER (Block Error Rate) Block Error Rate CBRA (Contention-Based Random Access) Competitive Random Access CBRACH (Contention-Based Random Access Channel) Competitive Random Access Channel CE (Control Element) Control Element CFRA (Contention Free Random Access) Non-conflict random access CORESET (Control Resource Set) Control resource set CSI-RS (Channel State Information Reference Signal) Channel state information reference signal DCI (Downlink Control Information) Downlink control information DMRS (Demodulation Reference Signal) Demolition reference signal FR (Frequency) Range) Frequency band gNB (5G Node B) 5G Node B
MAC (Medium Access Control) Medium Access Control NR (New Radio) New Radio PBCH (Physical Broadcast Channel) Physical Broadcast Channel PCell (Primary Cell) Primary Cell PDCCH (Physical Downlink Control Channel) Physical Downlink Control Channel PDSCH (Physical Downlink Shared Channel) ) Physical downlink shared channel PRACH (Physical Random Access Channel) Physical random access channel QCL (Quasi Co-Location) Pseudo-same location QoS (Quality of Service) Service quality RNTI (Radio Network Temporary Identifier) Radio network temporary identifier RRC (Radio Resource) Control) Radio resource control RSRP (Reference Signal Receive Power) Reference signal reception power RSRQ (Reference Signal Receive Quality) Reference signal reception quality Rx (Reception) Reception SCell (Secondary Cell) Secondary cell SINR (Signal-to-Interference-Plus-Noise) Ratio) Signal vs. Interference + Noise Ratio SS (Synchronization Signal) Synchronization Signal SSB (Synchronization Signal Block) Synchronization Signal Block SpCell (Special Cell) Special Cell TCI (Transmission Configuration Indication) Transmission Setting Marking TH1 (First Threshold) First Threshold Tx (Transmission) Transmission UE (User Equipment) User equipment