CN112584426A

CN112584426A - SFTD (space frequency division) measuring method for system frame number and frame timing deviation

Info

Publication number: CN112584426A
Application number: CN201910945457.2A
Authority: CN
Inventors: 金乐; 邝奕如; 王洲
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-03-30
Anticipated expiration: 2039-09-30
Also published as: WO2021063198A1; CN112584426B

Abstract

The method comprises the steps that the terminal equipment receives a first message, wherein the first message is used for indicating the terminal equipment to carry out the system frame number and the frame timing deviation SFTD in an IDLE RRC _ IDLE state and an INACTIVE RRC _ INACTIVE state, the first message further comprises a target frequency point list, each target frequency point optionally comprises a target cell list on the frequency point, when the terminal equipment is in the RRC _ IDLE state and the INACTIVE RRC _ INACTIVE state, the SFTD measurement is executed, and further, the terminal equipment reports the measurement result of the SFTD measurement.

Description

SFTD (space frequency division) measuring method for system frame number and frame timing deviation

Technical Field

The application relates to the technical field of wireless communication, in particular to an SFTD measuring method.

Background

In a mobile communication network, mobility management of a terminal device is an important issue. The terminal reselects and switches among cells with different coverage areas, so that continuous service of the wireless network is obtained. According to the difference of RRC (Radio Resource Control) connection states between the terminal and the base station, the terminal may be in an IDLE RRC _ IDLE state, an INACTIVE RRC _ INACTIVE state, or a CONNECTED RRC _ CONNECTED state. In the RRC _ IDLE state and the RRC _ INACTIVE state, there is no RRC link between the terminal and the base station. When the serving cell where the terminal resides meets a predetermined condition, for example, when the signal of the serving cell is lower than a certain threshold, the terminal measures the signal quality of the serving cell and the neighboring cell according to the information of the same frequency, different frequency and/or different system neighboring cells configured in the system message by the base station, and determines whether the signal quality meets a reselection condition. And if so, reselecting the cell of the adjacent cell and residing in the adjacent cell. In the RRC _ CONNECTED state, RRC connection exists between the terminal and the base station, and the base station configures the terminal to perform same-frequency, different-frequency and/or different-system neighbor cell measurement through RRC signaling. The terminal reports the measurement results of the serving cell and the neighbor cell to the base station through RRC signaling, and the base station switches the terminal to the cell with better signal quality according to the measurement results. Therefore, cell reselection in RRC _ IDLE state or RRC _ INACTIVE state, or cell handover in RRC _ CONNECTED state is based on the measurement results of the serving cell and the neighboring cell.

Disclosure of Invention

Based on this, embodiments of the present application provide an SFTD measurement method, a terminal device, a chip system, a network system, a readable storage medium, and a computer storage product, which are used to improve the measurement capability of the terminal device and can accurately measure SFTD of a current camped cell and an adjacent cell.

In one aspect, an embodiment of the present application provides a method for measuring a system frame number and a frame timing deviation (SFTD), where the method is applicable to a terminal device, and the method includes: the method comprises the steps that the terminal equipment receives first information, wherein the first information comprises a first frequency point list and a Physical Cell Identity (PCI) list contained in each frequency point; when the terminal equipment is in an IDLE state (RRC _ IDLE) or a non-activated state (RRC _ INACTIVE), the terminal equipment performs SFTD measurement according to the first information; when the terminal device is in a CONNECTED state (RRC _ CONNECTED), the terminal device transmits the SFTD measurement report. Thereby realizing SFTD measurement in a non-connection state.

In one possible design, the first information includes at least one of a SIB, SIB2, SIB3, SIB4, SIB5, SIB 24.

In one possible design, the sending, by the terminal device, the SFTD measurement report includes: and the terminal equipment sends an RRC Connection setup Complete message (RRC Connection Complete) to a network side, wherein the message comprises the SFTD measurement report.

In one possible design, the first information includes at least one or more of: a first cell maxsfstdidilemeascarriers for indicating the maximum frequency point number of the first frequency point list; a second cell carrierFreq for indicating the frequency point number of the first frequency point; a third cell measCellList-r15, for indicating the cell PCI list on each frequency point.

In one possible design, before the terminal device is in a CONNECTED state (RRC _ CONNECTED), the method includes: the terminal equipment initiates an RRC Connection Request message.

In one possible design, when the RRC Connection Complete message includes at least one or more of the following: a fourth cell SFTDMeasResultIdle, wherein the fourth cell is used for indicating the SFTD measurement result between the resident cell and the target cell; a fifth cell SFTDMeasResultListIdle, the fifth cell for indicating the SFTD measurement report; a sixth information element phySCELId for indicating the PCI list of the target cell; the seventh information element is for indicating the SFTD measurement report; a seventh information element SFN-OffsetResult-r15, the seventh information element for indicating the SFN offset of the camped cell and the target cell; an eighth information element, frame boundaryaOffsetResult-r 15, for indicating a timing offset between the camping cell and the frame boundary of the target cell, wherein the target cell is a neighbor cell where a terminal device needs to perform SFTD.

In one possible design, before the terminal device is in a CONNECTED state (RRC _ CONNECTED), the method includes: and the terminal equipment initiates to send an RRC Connection Resume Request message.

In one possible design, the sending, by the terminal device, the SFTD measurement report includes: and the terminal equipment sends an RRC Connection establishment completion message (RRC Connection Resume Complete) to a network side, wherein the message comprises the SFTD measurement report.

In one possible design, the sending, by the terminal device, the SFTD measurement report includes: the terminal equipment sends an RRC Connection setup Complete message (RRC Connection Complete) to a network side, wherein the message comprises a ninth cell SFTDIdleMeasAvailable, and the first cell indicates the terminal equipment to obtain the SFTD measurement report.

In one possible design, the terminal device receives a first request, where the first request is used to instruct the terminal to report the SFTD measurement report.

In one possible design, in response to the first request, the terminal device sends a first response that includes the SFTD measurement report.

In one possible design, the sending, by the terminal device, the SFTD measurement report includes: the terminal device sends an RRC Connection setup recovery message (RRC Connection Resume Complete) to a network side, where the RRC Connection Resume Complete includes a first information element, and the first information element indicates the terminal device to obtain the SFTD measurement report.

In a possible design, the first information is an RRC Connection Reconfiguration message, and the Reconfiguration message includes a target frequency point list, and each target frequency point optionally includes a PCI list of a target cell on the frequency point.

In one possible design, before the terminal device is in a CONNECTED state (RRC _ CONNECTED), the method includes: the terminal equipment sends an RRC Connection Request message; the terminal device receives an RRC Connection Setup message.

In one possible design, the terminal device sends an RRC ConnectionSetup Complete message that includes the SFTD measurement report.

In one possible design, before the terminal device is in a CONNECTED state (RRC _ CONNECTED), the method includes: the terminal equipment initiates sending of an RRC Connection Resume Request message; the terminal device sends an RRC connectionresponse message.

In one possible design, the terminal device sends an RRC Connection response Complete message that includes the SFTD measurement report.

On the other hand, the embodiment of the present application further provides a chip, including: a memory storing instructions;

the processor is used for receiving the code instructions and transmitting the code instructions to the processor, and the processor is used for operating the code instructions to perform the method.

In a third aspect, an embodiment of the present application further provides an electronic device, which includes: one or more processors; a memory; a plurality of application programs;

and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions, which when executed by the electronic device, cause the electronic device to perform the above steps.

In a fourth aspect, an embodiment of the present application further provides a method, where the method includes: the method comprises the steps that terminal equipment receives first information sent by a network side, wherein the first information indicates that a terminal base station supports RRC _ IDLE/RRC _ INACTIVE state SFTD measurement capability; after RRC connection is established, a network side sends UE Capability inquiry to carry out Capability inquiry on the terminal equipment; the terminal equipment returns the UE capability information to the network side, wherein the UE capability information comprises a field for indicating that the terminal equipment supports the measurement of the SFTD in the RRC _ IDLE/RRC _ INACTIVE state; when the RRC connection is released, the terminal equipment sends RRC connection release to the network side, wherein the RRC connection release message carries a target frequency point list measured by the SFTD in an RRC _ IDLE/RRC _ INACTIVE state, and each target frequency point optionally comprises a PCI list of a target cell on the frequency point. The SFTD measurement is performed when the terminal device is in a state when the terminal device is in RRC _ IDLE/RRC _ INACTIVE. When the terminal device completes RRC connection, the terminal device may send an RRC ConnectionSetup Complete message to the network side, where the RRC ConnectionSetup Complete message indicates that the base station terminal obtains the SFTD measurement result; responding to UE Information Request Information sent by a network side, wherein the Information indicates a terminal to report an SFTD measurement result, and the terminal equipment sends UE Information Response to the network side, and the Information carries SFTD Information measured before RRC connection.

In a fifth aspect, an embodiment of the present application further provides an electronic device, which includes: one or more processors; a memory; a plurality of application programs;

In a sixth aspect, an embodiment of the present application further provides a chip, including: a memory storing instructions;

In a seventh aspect, an embodiment of the present application further provides a method, where the method includes: the method comprises the steps that terminal equipment receives first information sent by a network side, wherein the first information indicates that a terminal base station supports RRC _ IDLE/RRC _ INACTIVE state SFTD measurement capability; after RRC connection is established, a network side sends UE Capability inquiry to carry out Capability inquiry on the terminal equipment; the terminal equipment returns the UE capability information to the network side, wherein the UE capability information comprises a field for indicating that the terminal equipment supports the measurement of the SFTD in the RRC _ IDLE/RRC _ INACTIVE state; when the RRC connection is released, the terminal equipment sends RRC connection release to the network side, wherein the RRC connection release message carries a target frequency point list measured by the SFTD in an RRC _ IDLE/RRC _ INACTIVE state, and each target frequency point optionally comprises a PCI list of a target cell on the frequency point. The SFTD measurement is performed when the terminal device is in a state when the terminal device is in RRC _ IDLE/RRC _ INACTIVE. When the terminal equipment performs RRC Connection, the terminal equipment may send an RRC Connection Response Complete message to the network side, indicate in an RRC signaling rrcconnectionresummecomplete that the base station terminal obtains an SFTD measurement result, after the RRC Connection is established, the network side may initiate UE Information Request Information to the terminal equipment, indicate the terminal to report the SFTD measurement result, respond to the UE Information Request Information sent by the network side, indicate the terminal to report the SFTD measurement result, and send the UE Information Response to the network side, where the Information carries the SFTD Information measured before the RRC Connection.

In an eighth aspect, an embodiment of the present application further provides an electronic device, which includes: one or more processors; a memory; a plurality of application programs;

In a ninth aspect, an embodiment of the present application further provides a chip, including: a memory storing instructions;

In a tenth aspect, an embodiment of the present invention provides a readable storage medium for storing computer software instructions for implementing the above-described implementation.

In an eleventh aspect, an embodiment of the present invention provides a readable storage medium for storing computer software instructions for implementing the above-described implementation.

Drawings

Fig. 1 is a schematic diagram of a first system according to an embodiment of the present application.

Fig. 2 is a schematic view of a first measurement gap provided according to an embodiment of the present application.

Fig. 3 is a schematic view of a second measurement gap provided according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a second system according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a first SFTD measurement provided in an embodiment of the present application.

Fig. 6 is a schematic diagram of a second SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 7 is a schematic diagram of a third SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 8 is a schematic diagram of a fourth SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 9 is a schematic diagram of a fifth SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 10 is a schematic diagram of a sixth SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 11 is a schematic diagram of a seventh SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 12 is a schematic diagram of an eighth SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 13 is a schematic diagram of a ninth SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 14 is a schematic diagram of a tenth SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 15 is a schematic diagram of an eleventh SFTD measurement provided in accordance with an embodiment of the present application.

Fig. 16 is a schematic diagram of a chip system according to an embodiment of the present disclosure.

Detailed Description

As shown in fig. 1, a schematic diagram of reselection or handover of a typical terminal on different cells is provided. For example, the current terminal device resides in the cell1, and when a preset condition is met, the base station may send an instruction for measuring the neighboring cell, for example, to measure the

cell

2 or 3, and further, the base station performs operations such as cell handover according to a measurement report reported by the terminal.

For the inter-frequency/inter-system measurement in the RRC _ CONNECTED state, a measurement requiring gap (measurement gap) or a measurement not requiring gap may be employed according to the capability of the terminal. If the terminal has a plurality of sets of radio frequency channels, the terminal can support the simultaneous signal receiving and sending on the service cell and the signal receiving on the different-frequency/different-system adjacent cell, and the terminal supports the measuring mode without gap; otherwise, a measurement mode requiring gap is needed, the signal receiving and sending on the service cell are stopped in the gap, the radio frequency channel is adjusted to the frequency point of the different frequency/different system, and the signals of the adjacent cell of the different frequency/different system are received. The measurement gap is configured by the base station, and the base station does not schedule the terminal to receive downlink and transmit uplink in the gap on the serving cell, so that uplink and downlink error codes cannot be caused in the gap.

As shown in fig. 2, a diagram of a typical measurement gap is provided, which includes an MGRP parameter, a gap offset parameter, and an MGL. The configuration of the measurement gap is mainly composed of 3 parameters: configuring a Measurement Gap Period by an MGRP (Measurement Gap Repetition Period); MGL (Measurement Gap Length) configures the Length of Measurement Gap; the gap offset configuration measures the start position of the gap. From these 3 parameters, it can be determined that the measurement gap start position is on SFN (System Frame Number) and subframe (subframe) that satisfy the following condition:

SFN mod T＝FLOOR(gap offset/10)；

subframe＝gap offset mod 10；

T＝MGRP/10；

the above SFNs and subframes are SFNs and subframes of PCell (Primary Cell). MGL is maximum 6 ms. Table 1 shows two different types of Gap specified in the protocol, as shown in the table:

as can be seen from table 1, the length of Gap is 6ms, and the period is 40ms or 80ms, which is used for measuring network parameters of inter-frequency or inter-system cells. Generally, due to the Gap, when the terminal device cannot transmit and receive data of the serving cell, that is, when the terminal device measures the network quality of the neighboring cell according to the Gap allocated by the network side, the terminal device cannot generally transmit and receive data of the serving cell.

However, measurement of a New Radio (NR) neighbor cell may be based on a Synchronization Signal Block (SSB), but due to the special design of the SSB Signal, if measurement is performed in a manner requiring gap (RRC _ CONNECTED inter-frequency/inter-system measurement), the base station needs to configure an accurate gap location to include the SSB of the neighbor cell. As shown in fig. 3, the SSBs of the NR cells are transmitted in a period, which may be 5ms, 10ms, 20ms, 40ms, 80ms, or 160 ms. Multiple SSBs may be sent in one cycle, but all SSBs are collectively sent in 15 ms, forming one SSB burst. For example: when the SSB period is 20ms, there are 4 5ms in one period, and all SSBs are concentrated in 1 of the 5ms for transmission, and no SSB is transmitted in the other 3 5 ms. Therefore, when the base station configures the measurement gap, the gap needs to include the SSB transmission time (gap indicated by a solid line in fig. 3), otherwise, the terminal cannot receive the SSB (gap indicated by a dotted line in fig. 3) of the NR neighboring cell in the gap, and thus cannot detect the cell. This is different from LTE Cell measurement, and since the Reference Signal CRS (Cell Reference Signal) of an LTE (Long Term Evolution) Cell is uniformly distributed on each subframe, the CRS can be received in the gap at any position.

In order to configure a correct gap position, a base station needs to know the timing deviation between the PCell and the NR neighboring cell, so as to determine that the SFN and the subframe number of the SSB of the NR neighboring cell correspond to the SFN and the subframe number of the PCell. This can be achieved by measuring SFTD (SFN and frame timing difference) of the terminal to obtain the timing deviation of two cells and reporting the timing deviation to the base station. The SFTD measurement includes deviation of SFN and timing deviation of frame boundary. In the protocol, SFTD measurements between LTE PCell and NR PSCell (primary cell of a secondary cell group) under EN-DC (EUTRA-NR Dual Connectivity), between NR PCell and LTE PSCell under NE-DC (NR-EUTRA Dual Connectivity), between NR PCell and NR PSCell under NR-DC (NR Dual Connectivity), and between LTE PCell and NR neighbor under non-DC (Dual Connectivity) may be supported later along with development of the standard protocol, between NR PCell and NR neighbor, between NR PSCell and NR neighbor, and between PCell or LTE PSCell and NR neighbor under LTE DC.

When performing SFTD measurement, the terminal needs to receive a signal of another measured cell except for PCell to acquire timing information of the cell. Under the DC dual link, as the terminal can support the simultaneous work on the PCell and the PSCell and know the timing information of the PCell and the PSCell at any time, the SFTD measurement between the PCell and the PSCell has no difficulty; the SFTD measurement between the PCell and the NR adjacent area under non-DC, if the radio frequency path of the terminal does not support receiving and sending signals on the PCell and receiving signals on the NR adjacent area, the SFTD measurement has certain difficulty, and the following two modes are supported according to the current protocol: both SFTD measurements requiring gap and those requiring a CDRX (CONNECTED Discontinuous Reception) inactive period, there is a possibility that no NR neighbor SSB can be measured. Similarly, under Dual Connectivity (DC) (including EN-DC, NE-DC, NR-DC, LTE DC, etc.), SFTD measurement between a PCell or a PSCell and an NR neighbor cell also has the same problem as shown in table 2, and according to the difference between the currently camped cells and the difference between target cells that need to be measured, the UE may have an SSB scenario in which no NR cell can be measured during measurement.

As shown in table 2, several scenarios are illustrated. For example, in a scenario where the camping scenario is LTE, when a network side or a terminal device needs to measure a neighboring cell (e.g., an NR cell), that is, SFTD parameters of an LTE PCell cell and an NR neighboring cell need to be measured, an SSB scenario where NR cannot be measured may exist in an LTE cell where the current terminal device camps; for another example, in an EN-DC scenario, the primary cell currently camped on is an LTE cell, the secondary cell is an NR cell, and when a network side or a terminal device needs to measure a neighboring cell (e.g., an NR cell), an SFTD parameter of an LTE PCell cell and an NR neighboring cell or an SFTD parameter of an NR PSCell cell and an NR neighboring cell need to be measured, there may be a scenario where an SSB where NR cannot be measured.

As shown in fig. 4, a system is provided, which includes but is not limited to a terminal device 1, a terminal device 2, and a cell1, a cell 2, and a cell 3, where the cell1 and the cell 2 have overlapping coverage (possibly one of the cells has larger coverage than the other), such as an LTE cell and an NR cell in an NSA (Non-Standalone networking) network; while cell1 and cell 3 have different coverage areas and overlap at their cell edges, e.g. two NR cells that are adjacent to each other. The terminal 1 can measure the SFTD between the cell1 and the cell 2 within the coverage of the cell1 and the cell 2; terminal 2 may measure the SFTD between cell1 and cell 3 within the coverage of cell1 and cell 3.

Taking SFTD measurement between LTE PCell and NR neighbor under non-DC as an example. Generally, if the radio frequency path of the terminal (generally speaking, the measurement capability of whether the inter-frequency or inter-system measurement requires Gap is often determined by the number of receiving channels of the radio frequency processing unit RFIC) does not support receiving and transmitting signals on the PCell while receiving signals on the NR neighbor cell, the base station is required to allocate the measurement Gap, and the terminal receives the NR neighbor cell signals within the measurement Gap to acquire timing information of the NR neighbor cell. Generally, as shown in fig. 5:

step 501: in the RRC _ CONNECTED state, for example, the UE enters the RRC _ CONNECTED state through an RRC establishment procedure in the RRC _ IDLE state or enters the RRC _ CONNECTED state through an RRC recovery procedure in the RRC _ INACTIVE state, and the base station configures the SFTD measurement through signaling RRCConnectionReconfiguration. In the measurement report configuration associated with the frequency point of the cell to be measured, setting the field reportSFTD-Meas in the cell reportSFTD to be 'true', and simultaneously configuring the measurement gap in the cell measGapConfig.

Step 502: the terminal replies to the base station RRCConnection Reconfiguration complete after receiving the signaling RRCConnection Reconfiguration.

Step 503: and the terminal detects the SSB of the target neighbor cell in a certain measurement gap, obtains the timing information of the target neighbor cell, and calculates the SFTD result between the LTE PCell and the target neighbor cell.

Step 504: and the terminal reports the SFTD measurement result in a signaling Measurementreport.

Generally, after the base station receives the SFTD measurement result reported by the terminal, when the base station needs to initiate measurement of the neighboring cell, the base station configures the location of the measurement gap according to the timing offset, so that the measurement gap includes the SSB of the neighboring cell, and the terminal can receive the SSB of the neighboring cell in the measurement gap, thereby measuring the signal quality of the neighboring cell.

If the terminal wants to obtain the timing information of the NR neighbor, it must receive the SSB of the neighbor. Obtaining symbol Synchronization through a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) in the SSB, and obtaining a Physical Cell Identity (PCI) of the Cell; frame synchronization and system frame number are obtained through DMRS (Demodulation Reference Signal) and PBCH (Physical Broadcast Channel) in SSB. However, as described above, due to the specificity of NR SSB signal design, the base station is required to configure the correct location of the gap so that the gap contains the SSBs of the NR neighbor. The original purpose of the SFTD measurement is to provide timing deviation information for the base station to configure the correct gap location, and the SFTD measurement itself needs the base station to configure the correct gap location, so that the SFTD measurement requiring the gap cannot be performed.

In addition, the protocol supports SFTD measurements using an inactive period of CONNECTED Discontinuous Reception (CDRX) in RRC _ CONNECTED state. In the CDRX inactive period, the terminal does not need to transmit and receive data on the serving cell, and can adjust the radio frequency path to the frequency point where the NR adjacent cell is located, receive the NR adjacent cell signal and obtain the timing information of the NR adjacent cell. Whether the terminal can enter into CDRX inactivity period depends on the current traffic situation. If the uplink and downlink data services continuously exist, the terminal cannot enter a CDRX (compact disc radio network controller) inactive period, so that SFTD measurement cannot be completed before the reporting timing of the SFTD measurement is overtime.

Furthermore, the protocol supports lossy measurement without gap, i.e. the terminal interrupts the signal transmission and reception on the serving cell for a period of time, and receives the signal of the NR neighbor cell for measuring SFTD. However, this method is lossy, and on the one hand, data cannot be transmitted and received during the interruption, and on the other hand, RRC signaling cannot be received during the interruption, so that states between the base station and the terminal are inconsistent, and after the interruption is completed, data traffic between the terminal and the base station cannot be resumed.

Based on the situation that the SFTD measurement cannot be implemented in some scenes in the RRC _ CONNECTED state SFTD measurement, a new method is provided for the SFTD measurement. A network side broadcasts a target frequency point list measured by SFTD in an SIB (System Information Block), and each target frequency point optionally includes a PCI (Physical Cell Identity) list of a target Cell on the frequency point, and a UE measures SFTD in an RRC _ IDLE/RRC _ INACTIVE state and reports an SFTD result when or after the RRC _ CONNECTED state is established, as shown in fig. 6, the method specifically includes the following steps:

step 601: the terminal equipment receives first information sent by a network side, wherein the first information is used for indicating a target frequency point list of the terminal equipment for carrying out RRC _ IDLE/RRC _ INACTIVE state SFTD measurement, and each target frequency point optionally comprises a PCI list of a target cell on the frequency point. In some embodiments, the first information may be periodically transmitted by the base station in a broadcast manner, and the terminal device reads the first information in the process of camping on the cell. In some embodiments, the terminal may receive a system message, such as a SIB message, for the target cell before camping on the target cell.

In one possible design, the first message may further include a first indication bit, where the indication bit is used to indicate the terminal device to perform SFTD measurement of the neighboring cell.

Step 602: the terminal device performs the SFTD measurement.

The terminal reads the first message of the cell. And if the first information indicates the SFTD measurement target frequency point list, the terminal equipment carries out SFTD measurement on each target frequency point in the target frequency point list in an RRC _ IDLE/RRC _ INACTIVE state. When a certain target frequency point in the target frequency point list does not contain the PCI list of a target cell on the frequency point, the terminal equipment detects NR adjacent cells possibly existing on the frequency point in an RRC _ IDLE/RRC _ INACTIVE state, selects N strongest adjacent cells as target cells, and measures the SFTD between the currently resident PCell and the target adjacent cells; and if a certain target frequency point in the target frequency point list contains the PCI list of the target cell on the frequency point, the terminal equipment measures the SFTD between the PCell and the target cell contained in the PCI list in an RRC _ IDLE/RRC _ INACTIVE state.

In the RRC _ IDLE/RRC _ INACTIVE state, the terminal device detects the SSB of the target cell at an IDLE time. Obtaining symbol synchronization through PSS and SSS in SSB; frame synchronization and system frame number are obtained through DMRS and PBCH in SSB, so that the terminal obtains synchronization with the target cell. As shown in fig. 7, the terminal obtains an SFTD result by calculating the SFN of the PCell and the SFN deviation of the target cell corresponding to the same time, and the frame boundary deviation.

SFN offset (SFN offset) — (n-m +1024) mod 1024

Frame boundary offset (Frame boundary offset) is downwardly evidence ((TS)₁-TS₂)/5)

Where n and m are the SFN of PCell and the SFN of the target cell at a certain time, respectively, and frame n starts earlier than frame m; TS (transport stream)₁And TS₂The start times of frame n and frame m, respectively, are in units of Ts.

Step 603: when the terminal device sends an RRC connection request.

The terminal device initiates an RRC Connection to the network side, for example, sends an RRC Connection Request message to the network side, and generally, when the terminal device needs to be transferred from an RRC _ IDLE state to an RRC _ CONNECTED state, the terminal device triggers an RRC Connection Request, for example, when the terminal device needs to perform actions such as responding to paging, TAU, Attach, and the like.

Step 604: the terminal device receives a response message of the RRC connection request.

When the network side receives the RRC Connection request initiated by the terminal device, the network side may initiate a message of RRC Connection Setup, for example, send a message of RRC Connection Setup to the terminal device.

Step 605: the RRC connection setup is completed.

In this embodiment, the terminal device may carry the SFTD measurement result before RRC establishment in the RRC Connection Complete message, or in some embodiments, may report the SFTD measurement result after the RRC establishment is completed.

In this embodiment of the present application, in step 601, the network side may further send the measured frequency point and PCI Information of the target cell in an SIB message (System Information Block), where the cell is as follows:

the meaning of each field is as follows:

the terminal can read the SIB information from the network side when camping on the cell. The terminal can initiate SFTD measurement in an RRC _ IDLE state before initiating registration to the cell, and reports an SFTD measurement result in an RRC connection establishment process of initiating registration; or initiating the SFTD measurement in other RRC _ IDLE state/RRC _ INACTIVE state, and reporting the SFTD measurement result in the next RRC connection establishment process.

In some embodiments, the terminal may report the SFTD measurement result in the RRC signaling RRC ConnectionSetupComplete of the RRC connection establishment procedure, where the SFTD measurement result information element is as follows:

the meaning of each field is as follows:

there are a number of SIBs in both LTE and NR. In some embodiments, the first information may be collectively placed in SIB1, SIB2, or SIB3 in LTE, or placed in SIB4, SIB5, or SIB24 according to the target frequency point being an intra-frequency, inter-frequency, or inter-system frequency point, respectively, and the terminal needs to read the 3 SIB messages to acquire complete SFTD target frequency point information. In the NR, the first information may be collectively placed in SIB1 or SIB2, or placed in SIB3 and SIB4 respectively according to whether the target frequency point is the same frequency or different frequency, and the terminal needs to read the 2 SIB messages to obtain complete SFTD target frequency point information.

In the implementation of the application, the terminal device is instructed to perform SFTD measurement through an SIB message, and in each frequency point information of an SFTD measurement target frequency point list in an RRC _ IDLE/RRC _ INACTIVE state sent in the SIB, or in PCI information of each frequency point, a signal strength Threshold SFTD-Threshold, a delay Threshold timeToTrigger, and a trigger relationship triggerrelationship may be included, which indicates that SFTD measurement is triggered when the continuous timeToTrigger of the signal strength of the PCell is lower than or higher than the Threshold SFTD-Threshold.

sftd-Threshold RSRP-Range OPTIONAL

timeToTrigger TimeToTrigger OPTIONAL

triggerRelation ENUMERATED{bigger} OPTIONAL。

In the above method, it is considered that there are a large number of IDLE times in the RRC _ IDLE/RRC _ INACTIVE states, and the terminal does not need to transmit and receive signals on the serving cell, and these IDLE times are available for receiving signals of the neighboring cell. Since the timing offset between the two cells is fixed, SFTD is measured in RRC _ IDLE/RRC _ INACTIVE state and can also be used when the base station configures measurement gap in RRC _ CONNECTED state. The large amount of IDLE time in the RRC _ IDLE/RRC _ INACTIVE state can measure the timing deviation between the PCell and a plurality of adjacent regions on a plurality of frequency points. And as long as one user in the RRC IDLE/RRC INACTIVE state measures the timing offset between two cells, it can be applied to all other users in the cell. And meanwhile, the SFTD is measured in an RRC _ IDLE/RRC _ INACTIVE state, so that the problem that the RRM measurement delay is increased and the call drop risk is caused by untimely switching in a high-speed moving scene due to the fact that the base station initiates the SFTD measurement for configuring the measurement gap before the RRM measurement is configured is avoided. For the inter-frequency/inter-system measurement in the RRC _ IDLE state or the RRC _ INACTIVE state, since the terminal is in the IDLE state for most of the time and does not need to transmit or receive data on the serving cell, these IDLE times can be used for the inter-frequency/inter-system measurement, and therefore the measurement gap is not configured.

In the RRC _ IDLE/RRC _ INACTIVE state, the terminal may reselect from cell1 to cell 2 as the terminal location moves, and if both cells are configured with SFTD measurements in the RRC _ IDLE/RRC _ INACTIVE state, the terminal will obtain the SFTD measurement result between cell1 and its neighboring cells, and the SFTD measurement result between cell 2 and its neighboring cells. When the terminal enters the RRC _ CONNECTED state and reports the SFTD measurement result, only reporting the SFTD measurement result related to the current PCell of the terminal, namely: if the terminal reselects to the cell 2 and enters the RRC _ CONNECTED state on the cell 2, only the SFTD measurement result between the cell 2 and the adjacent cell is reported when the SFTD result is reported.

In another embodiment according to the present application, as shown in fig. 8, another method of SFTD measurement is provided. The difference from the RRC IDLE state SFTD measurement is that the transition from RRC _ INACTIVE state to RRC _ CONNECTED state uses an RRC recovery procedure. Therefore, the terminal reports the SFTD measurement result in the RRC signaling RRCConnection response Complete. The specific process is as follows:

step 801: the terminal equipment receives first information sent by a network side, wherein the first information is used for indicating a target frequency point list of the terminal equipment for carrying out RRC _ IDLE/RRC _ INACTIVE state SFTD measurement, and each target frequency point optionally comprises a PCI list of a target cell on the frequency point. In some embodiments, the terminal receives a system message, such as an SIB message, of the target cell before camping on the target cell, and enters an RRC _ CONNECTED state after the terminal device completes camping.

In the RRC _ CONNECTED state, when there is no uplink and downlink traffic data transmission between the terminal and the base station for a period of time, the base station may select to switch the terminal from the RRC _ CONNECTED state to the RRC _ INACTIVE state, so as to save power consumption of the terminal. Meanwhile, when the uplink and downlink service data transmission needs to be recovered between the terminal and the base station, the base station can rapidly enter the RRC _ CONNECTED state through RRC connection.

The use of the information element in the SIB message in this step may be the same as in the corresponding embodiment of fig. 6.

Step 802: the terminal device performs the SFTD measurement.

The specific measurement procedure for SFTD may be the same as step 602.

Step 803: the terminal device sends an RRC connection recovery request.

Generally, the terminal device needs to initiate an RRC recovery procedure from the RRC _ INACTIVE state to the RRC connected state, for example, sending an RRC Connection response Request to the network side.

Step 804: the terminal device receives a response message of the RRC connection request.

After receiving the RRC recovery request initiated by the terminal device, the network side initiates an RRC Connection Resume procedure to the terminal device.

Step 805: the RRC ConnectionResume flow is complete.

In this embodiment, the terminal device may carry an SFTD measurement result before the RRC establishment is completed in the RRC Connection response Complete message, or in some embodiments, may separately carry the SFTD measurement result before the RRC establishment is completed.

The above embodiment is an example of the RRC _ INACTIVE state SFTD measurement, and the difference from the RRC _ IDLE state SFTD measurement is that the conversion from the RRC _ INACTIVE state to the RRC _ CONNECTED state uses the RRC recovery procedure. Therefore, the terminal reports the SFTD measurement result in the RRC signaling RRCConnectionResumeCommplete.

In some embodiments, an information element may be added in the RRC Connection resource Complete message, which is described as follows:

the meaning and function of the above-mentioned cells can be the same as the corresponding embodiment of fig. 6.

sftd-Threshold RSRP-Range OPTIONAL

timeToTrigger TimeToTrigger OPTIONAL

triggerRelation ENUMERATED{bigger} OPTIONAL。

As shown in fig. 9, another embodiment of the present application further provides a method for measuring SFTD, where the measurement result of SFTD in RRC _ IDLE state may be reported to the base station through RRC signaling after the RRC connection is restored.

Step 901: the terminal equipment receives first information sent by a network side, wherein the first information is used for indicating a target frequency point list of the terminal equipment for carrying out RRC _ IDLE/RRC _ INACTIVE state SFTD measurement, and each target frequency point optionally comprises a PCI list of a target cell on the frequency point. In some embodiments, the terminal receives a system message, such as an SIB message, of the target cell before camping on the target cell, and enters an RRC _ CONNECTED state after the terminal device completes camping.

Step 902: the terminal device performs the SFTD measurement.

The specific measurement procedure for SFTD may be the same as 602.

Step 903: when the terminal device sends an RRC connection request.

Generally, when the terminal device needs a state Connection state from an IDLE state, the terminal device may trigger an RRC Connection Request, for example, when the terminal device needs to perform an action, such as paging, TAU, Attach, and the like, and respond to the action.

Step 904: the terminal device receives a response message of the RRC connection request.

When the network side receives the RRC Connection request initiated by the terminal device, the network side may initiate a message of RRC Connection Setup, for example, a message of RRC Connection Setup is sent to the terminal device.

Step 905: the RRC connection setup is completed.

The terminal device may send an RRC Connection Complete message to the network side to indicate that the RRC Connection is established, and indicate that the base station terminal obtains the SFTD measurement result, for example, add cell sftdldlemeasavailable and set to TRUE.

Step 906: the network side initiates a request to the terminal equipment to obtain the SFTD measurement result.

After the RRC connection is established, the network side may initiate UE Information Request Information to the terminal device, and instruct the terminal to report the SFTD measurement result, for example, add cell sftdldlemeasreq and set to TRUE.

Step 907: and the terminal equipment returns a response and reports the SFTD measurement result.

In this embodiment, the terminal device may further carry SFTD Information measured before RRC connection in the UE Information Response Information. So that the network side configures the neighbor measurement gap according to the result of the SFTD measurement.

Wherein, one form of the cell SFTDIdleMeasAvailable and the cell SFTDIdleMeasReq is as follows:

SFTDIdleMeasAvailable ENUMERATED{true}OPTIONAL

SFTDIdleMeasReq ENUMERATED{true}OPTIONAL

the sftdldlemeasavailable field is optional and if it is included in the RRCConnectionSetupComplete signaling, it is set to true, indicating that the terminal has obtained the SFTD measurement result; if not included in the RRCConnectionSetupComplete signaling, it indicates that the standard terminal has not obtained the SFTD measurement result.

The SFTDIdleMeasReq field is optional, and if the field is contained in UEInformationRequest signaling, the field is set to true to indicate that the base station indicates the terminal to report the SFTD measurement result; and if the measurement result is not contained in the UEInformationRequest signaling, the base station does not require the terminal to report the SFTD measurement result.

sftd-Threshold RSRP-Range OPTIONAL

timeToTrigger TimeToTrigger OPTIONAL

triggerRelation ENUMERATED{bigger}OPTIONAL。

As shown in fig. 10, the embodiment of the present application further provides another embodiment, which is basically the same as the reporting process of the SFTD measurement result in the RRC _ IDLE state, and the difference is that an RRC recovery process is used for the conversion from the RRC _ INACTIVE state to the RRC _ CONNECTED state. Therefore, the terminal indicates in the RRC signaling rrcconnectionresummemplete that the base station terminal obtains the SFTD measurement result (cell sftdldlemeasavailable is set to TRUE), the method includes the following steps:

step 1001: the terminal equipment receives first information sent by a network side, wherein the first information is used for indicating a target frequency point list of the terminal equipment for carrying out RRC _ IDLE/RRC _ INACTIVE state SFTD measurement, and each target frequency point optionally comprises a PCI list of a target cell on the frequency point. In some embodiments, the terminal receives a system message, such as an SIB message, of the target cell before camping on the target cell, and enters an RRC _ CONNECTED state after the terminal device completes camping.

Step 1002: the terminal device performs the SFTD measurement.

This step may employ the same method as step 602.

Step 1003: the terminal device sends an RRC connection recovery request.

Step 1004: the terminal device receives a response message of the RRC connection request.

Step 1005: the RRC ConnectionResume flow is complete.

In this embodiment, in an RRC signaling rrcconnectionresummeomplete, it indicates that the base station terminal obtains an SFTD measurement result, for example, an sftdldlemeasavailable cell is added and set as TRUE.

Step 1006: the network side initiates a request to the terminal equipment.

Step 1007: the terminal device returns a response.

SFTDIdleMeasAvailable ENUMERATED{true}OPTIONAL

SFTDIdleMeasReq ENUMERATED{true}OPTIONAL

sftd-Threshold RSRP-Range OPTIONAL

timeToTrigger TimeToTrigger OPTIONAL

triggerRelation ENUMERATED{bigger} OPTIONAL。

And the base station sets a threshold value according to the coverage range of the cell. As shown in fig. 4, when the RSRP of the PCell measured by the terminal is lower than a certain threshold, it indicates that the terminal is at the edge of the cell1 and may be in the coverage of the cell 3, and thus the SFTD measurement between the PCell and the cell 3 is configured, the triggering condition is configured that the RSRP of the PCell is lower than a certain threshold; when the RSRP of the PCell measured by the terminal is higher than a certain threshold, it indicates that the terminal is in the center of the cell1 and may be in the coverage of the cell 2, and therefore, when configuring SFTD measurement between the PCell and the cell 2, the triggering condition is configured such that the RSRP of the PCell is higher than a certain threshold.

The terminal device measures SFTD in an RRC _ IDLE/RRC _ INACTIVE state, and reports the measurement result in an RRC _ CONNECTED state. And the terminals positioned in different coverage areas report the PCell and SFTD of part of adjacent intervals, and the base station side can obtain the PCell and the SFTD of all the adjacent intervals. As shown in fig. 4, terminal 1 reports SFTD of cell1 and cell 2, and terminal 2 reports SFTD of cell1 and cell 3, so that the base station has complete SFTD information of cell1 and all neighboring cells (cell 2 and cell 3). Compared with an SFTD measuring mode in an RRC _ CONNECTED CDRX INACTIVE period, the method has the advantages that a large amount of IDLE time exists in the RRC _ IDLE/RRC _ INACTIVE states, and the problem that the SFTD measurement cannot be implemented due to the fact that no CDRX INACTIVE period exists does not exist; compared with an SFTD measuring mode in which the RRC _ CONNECTED state needs a gap, the IDLE time in the RRC _ IDLE/RRC _ INACTIVE state is used for measuring the adjacent region, the gap does not need to be distributed by the base station, the IDLE time reaches a second level, and the terminal can receive signals of the whole SSB period no matter how large the SSB period is, so that the SSB is detected. The large amount of idle time also means that more target frequency points and cells can be measured than in the RRC _ CONNECTED state.

The embodiment of the application also provides another SFTD measurement method, which is characterized in that the SFTD measurement in the RRC _ CONNECTED state is configured with the RRC _ IDLE/RRC _ INACTIVE state, and the measurement result is reported when/after the RRC connection is established next time. As shown in fig. 11, the specific method includes the following steps:

step 1101: the network side initiates an RRC Connection Reconfiguration message.

When the terminal device and the network side are in an RRC _ CONNECTED state, the network side may initiate an RRC Connection Reconfiguration message to the terminal device, and may indicate, in the message, a target frequency point list configured with RRC _ IDLE/RRC _ INACTIVE SFTD measurements, and each target frequency point may optionally include a PCI list of a target cell on the frequency point.

Step 1102: the terminal device completes RRC Connection Reconfiguration.

The terminal device transmits an RRC Connection Reconfiguration Complete message to the network side.

Step 1103: and the network side releases the RRC connection.

Generally, the network side triggers the procedure when it wants to release the RRC connection of the UE.

Step 1104: the terminal device performs the SFTD measurement.

When the terminal device is in the unconnected state, the SFTD measurement is performed, and the measurement method may be the same as step 602.

Step 1105: when the terminal device sends an RRC connection request.

Step 1106: the terminal device receives a response message of the RRC connection request.

Step 1107: the RRC connection setup is completed.

The terminal device may send an RRC Connection setup Complete message to the network side to indicate that RRC Connection setup is completed, in this embodiment of the present application, the terminal device may carry an SFTD measurement result before RRC setup is completed in the RRC Connection Complete message, or may separately carry the SFTD measurement result before RRC setup is completed in some embodiments.

the meaning and function of the above-described cells may be the same as in the corresponding embodiment of fig. 6.

The embodiment of the application also provides another SFTD measurement method, which is characterized in that the SFTD measurement in the RRC _ CONNECTED state is configured with the RRC _ IDLE/RRC _ INACTIVE state, and the measurement result is reported when/after the RRC connection is established next time. As shown in fig. 12, the specific method includes the following steps:

step 1201: the network side initiates RRC Connection Reconfiguration message;

when the terminal device and the network side are in an RRC connected state, the network side may reconfigure a message to the terminal device RRC Connection Reconfiguration, may indicate in the message a target frequency point list configured with RRC _ IDLE/RRC _ INACTIVE state SFTD measurements, and each target frequency point may optionally include a PCI list of a target cell on the frequency point, and the set cells may be the same as in the above embodiments.

Step 1202: the terminal device completes RRC Connection Reconfiguration.

Step 1203: the network side suspends the RRC connection.

Generally, the procedure is triggered when the network side wishes to suspend the RRC connection with the UE.

Step 1204: the terminal device performs the SFTD measurement.

Step 1205: the terminal device sends an RRC connection recovery request.

Step 1206: the terminal device receives a response message of the RRC connection request.

Step 1207: the RRC ConnectionResume flow is complete.

In some embodiments, the terminal may report the SFTD measurement result in an RRC signaling RRC Connection result Complete of the RRC Connection establishment procedure, where the SFTD measurement result information element is as follows:

the function and meaning of the above-mentioned cells can be the same as those of the embodiment corresponding to fig. 6.

In this embodiment, the terminal completes the SFTD measurement in the RRC _ IDLE state, and reports the SFTD measurement result in the RRC signaling RRCConnectionSetupComplete in the RRC connection establishment process. Or reporting the SFTD measurement result to the base station through RRC signaling after the RRC connection establishment is completed, for example, reporting the SFTD measurement result in RRC signaling UEInformationResponse. The terminal completes SFTD measurement in an RRC _ INACTIVE state, and reports the SFTD measurement result in an RRC signaling RRCConnectionResumeCommittee in an RRC connection recovery process. Or reporting the SFTD measurement result to the base station through RRC signaling after the RRC connection establishment is completed, for example, reporting the SFTD measurement result in RRC signaling UEInformationResponse. As shown in fig. 11 and 12, in the embodiment, the terminal device measures SFTD at RRC _ IDLE/RRC _ INACTIVE, and reports the measurement result at RRC _ CONNECTED. The embodiments shown in fig. 6 to 10 are to send a target frequency point list of SFTD through a broadcast mode (SIB message), and each target frequency point optionally includes a PCI list of a target cell on the frequency point, and all terminals in the cell need to perform SFTD measurement on the same frequency point and cell. In the embodiments shown in fig. 10 and fig. 11, the network side may selectively select a part of the termination points to perform SFTD measurement on part of the frequency points and cells. And the terminals positioned in different coverage areas report the PCell and SFTD of part of adjacent intervals, and the base station side can obtain the PCell and the SFTD of all the adjacent intervals. In the network structure shown in fig. 4, the base station can know that the terminal 1 is located inside the Cell1 (because RSRP of the Cell1 is high) according to RSRP of the Cell1 reported by the terminal 1 and the terminal 2, and configures the terminal 1 to measure SFTD between the Cell1 and the Cell 2 in the coverage area of the Cell 2; terminal 2 is at the edge of Cell1 (because RSRP of Cell1 is low), and may be in the coverage of Cell 3, and terminal 2 is configured to measure SFTD between Cell1 and Cell 3. The target frequency points and/or target cells measured by the terminal 1 and the terminal 2 are fewer, so that the power consumption is more saved. In addition, the base station may determine that it is not necessary to trigger a certain terminal to perform SFTD measurement according to the currently obtained SFTD condition. In the example shown in fig. 4, the base station obtains complete information of SFTD between adjacent zones in the network through terminal 1 and terminal 2, and for other terminals, the base station no longer needs to trigger SFTD measurement.

The embodiment of the application also provides another SFTD measurement method, and the support for the RRC _ IDLE/RRC _ INACTIVE state SFTD measurement is increased by multiplexing the current protocol RRC _ IDLE/RRC _ INACTIVE state RRM measurement mechanism. As shown in fig. 13, the specific steps include:

step 1301: the terminal device receives first information sent by a network side, and indicates that a terminal base station supports the RRC _ IDLE/RRC _ INACTIVE state SFTD measurement.

The first information may be a system message, for example, an SIB message, which includes a field indicating that the terminal base station supports RRC _ IDLE/RRC _ INACTIVE state SFTD measurement.

Step 1302: after the RRC connection is established, the network side inquires the capability of the terminal equipment.

The network side sends the UE Capability inquiry to the terminal equipment, and the UE Capability inquiry is used for inquiring the Capability of the terminal, including but not limited to measurement Capability.

Step 1303: the terminal equipment returns the UE capability information to the network side, wherein the UE capability information comprises a field for indicating that the terminal equipment supports the RRC _ IDLE/RRC _ INACTIVE state SFTD measurement.

Step 1304: and the network side releases the RRC connection.

Generally, the network side triggers the procedure when it wants to release the RRC connection of the UE. The RRC connection release message may also carry a target frequency point list measured by RRC _ IDLE/RRC _ INACTIVE SFTD, and each target frequency point may optionally include a PCI list of a target cell on the frequency point.

In this step, an information element may be added to the RRC connection release message, where the information element may be as follows:

Step 1305: the terminal device performs the SFTD measurement.

The SFTD measurement is performed while the terminal device is in RRC _ IDLE/RRC _ INACTIVE state.

The measurement method of this step may be the same as that of step 602.

Step 1306: when the terminal device sends an RRC connection request.

Step 1307: the terminal device receives a response message of the RRC connection request.

Step 1308: the RRC connection setup is completed.

The terminal device may send an RRC ConnectionSetup Complete message to the network side to indicate that the RRC connection establishment is Complete. The base station terminal is instructed in the RRC ConnectionSetup Complete message that SFTD measurement results are obtained.

Step 1309: the network side initiates a request to the terminal equipment.

After the RRC connection is established, the network side may initiate UE Information Request Information to the terminal device, and instruct the terminal to report the SFTD measurement result.

Step 1310: the terminal device returns a response.

In this embodiment, the terminal device may further carry SFTD Information measured before RRC connection in the UE Information Response Information. So that the network side configures the cell measurement gap according to the result of the SFTD measurement.

SFTDIdleMeasAvailable ENUMERATED{true}OPTIONAL

SFTDIdleMeasReq ENUMERATED{true}OPTIONAL

Fig. 13 shows an example of the RRC _ IDLE state SFTD measurement, which multiplexes the RRC _ IDLE state RRM measurement procedures supported by the current protocol.

1) In SIB2, the base station is instructed by the information element to support RRC IDLE state/RRC INACTIVE state SFTD measurements. The existing information element idlemodmeasurement in the current protocol can be multiplexed, and the meaning of the information element idlemodmeasurement is expanded to simultaneously indicate that the base station supports the SFTD measurement of RRC _ IDLE state/RRC _ INACTIVE state; or define a new cell, for example: the field is OPTIONAL, if contained in SIB2, the field is set to true, indicating that the base station supports RRC _ IDLE state/RRC _ INACTIVE state SFTD measurements; if not included in the SIB2, this indicates that the base station does not support RRC _ IDLE/RRC _ INACTIVE SFTD measurements, and the base station does not configure the RRC _ IDLE/RRC _ INACTIVE SFTD measurements.

2) In the UE capability reporting signaling UECapabilityInformation, the terminal is indicated to have RRC _ IDLE state/RRC _ INACTIVE state SFTD measurements, for example, including cell idlemodstdmeas, one form is as follows: IDLE mode SFTDMeas estimated supported option field, which is OPTIONAL and set to true if included in the signaling UECapabilityInformation, indicating that the terminal supports RRC _ IDLE state/RRC _ INACTIVE state SFTD measurements; if not included in SIB2, this indicates that the terminal does not support RRC _ IDLE/RRC _ INACTIVE SFTD measurements, and when the base station obtains this indication, the terminal device RRC _ IDLE/RRC _ INACTIVE SFTD measurements will not be configured.

3) SFTD measurement information is configured in RRC signaling RRCConnectionRelease, and one form of the SFTD measurement information is the cell SFTDMeasResultListIdle described in the first embodiment. And the RRC signaling RRCConnectionRelease simultaneously releases the RRC connection, so that the terminal enters an RRC _ IDLE state.

4) The terminal completes the SFTD measurement in the RRC _ IDLE state.

5) The terminal indicates the base station terminal to obtain the SFTD measurement result in the signaling RRCConnectionSetupComplete established by the RRC connection, for example, a cell sftdldlemeasavailable is added and set as TRUE, the base station indicates the terminal to report the SFTD measurement result in the RRC signaling UEInformationRequest, for example, the cell sftdldlemeasreq is set as TRUE, and the terminal reports the SFTD measurement result in the RRC signaling UEInformationResponse.

The embodiment of the application also provides another SFTD measurement method, and the support for the RRC _ IDLE/RRC _ INACTIVE state SFTD measurement is increased by multiplexing the current protocol RRC _ IDLE/RRC _ INACTIVE state RRM measurement mechanism. As shown in fig. 14, the specific steps include:

step 1401: the terminal device receives first information sent by a network side, and indicates that a terminal base station supports the RRC _ IDLE/RRC _ INACTIVE state SFTD measurement.

Step 1402: after the RRC connection is established, the network side inquires the capability of the terminal equipment.

Step 1403: the terminal equipment returns the UE capability information to the network side, wherein the UE capability information comprises a field for indicating that the terminal equipment supports the RRC _ IDLE/RRC _ INACTIVE state SFTD measurement.

Step 1404: the network side suspends the RRC connection.

Generally, the procedure is triggered when the network side wishes to suspend the RRC connection with the UE. The RRC connection release message may also carry a target frequency point list measured by RRC _ IDLE/RRC _ INACTIVE SFTD, and each target frequency point may optionally include a PCI list of a target cell on the frequency point.

Step 1405: the terminal device performs the SFTD measurement.

When the terminal device is in the unconnected state, the SFTD measurement is performed.

Step 1406: the terminal device sends an RRC connection recovery request.

Step 1407: the terminal device receives a response message of the RRC connection request.

Step 1408: the RRC ConnectionResume flow is complete.

The terminal device may send an RRC Connection response Complete message to the network side to indicate that the RRC Connection establishment is completed, and indicate in the RRC signaling rrcconnectionresummecomplete that the base station terminal obtains the SFTD measurement result, for example, add the cell sftdeldemeaseavailable, and set as TRUE.

Step 1409: the network side initiates a request to the terminal equipment.

Step 1410: the terminal device returns a response.

SFTDIdleMeasAvailable ENUMERATED{true}OPTIONAL

SFTDIdleMeasReq ENUMERATED{true}OPTIONAL

Fig. 14 is an example of RRC _ INACTIVE state SFTD measurement, which also multiplexes the RRC _ INACTIVE state RRM measurement procedure supported in the current protocol, and the difference from the RRC _ IDLE state SFTD measurement procedure is:

1) the RRC signaling RRCConnectionRelease suspends the RRC connection, so that the terminal enters an RRC _ INACTIVE state, but not releases the RRC connection and enters an RRC _ IDLE state. The SFTD measurement information is also configured in the signaling, and one form of the SFTD measurement information is the cell SFTDMeasResultListIdle described in the first embodiment.

2) The terminal enters the RRC _ CONNECTED state through the RRC connection recovery procedure, and the signaling rrcconnectionresummecomplete indicates that the base station terminal obtains the SFTD measurement result. Then, as in the SFTD measurement procedure in the RRC _ IDLE state, the base station instructs the terminal to report the SFTD measurement result in the RRC signaling UEInformationRequest, and the terminal reports the SFTD measurement result in the RRC signaling UEInformationResponse.

In the above embodiment, the terminal device measures the SFTD at RRC _ IDLE/RRC _ INACTIVE, and reports the measurement result at RRC _ CONNECTED state. And the terminals positioned in different coverage areas report the PCell and SFTD of part of adjacent intervals, and the base station side can obtain the PCell and the SFTD of all the adjacent intervals. The existing RRC _ IDLE/RRC _ INACTIVE RRM measurement processes are multiplexed, only the support for SFTD measurement is added, the protocol modification is small, and the standardization is easy.

In the above embodiment, except for the manner that the base station issues the UE Information Request message to instruct the terminal device to report the SFTD measurement, and the terminal device reports the SFTD measurement in the UE Information Response message, if the base station configures the RRM measurement in the RRC _ CONNECTED state, the measurement result of the SFTD may also be reported in a measurement report message MeasurementReport, for example, the measurement report carries the cell SFTDMeasResultListIdle.

Current SFTD measurements are optional UE capabilities, so the network may not have any UE on which to rely to obtain the time difference. On the other hand, SFTD measurements may be based on gaps or no gaps (i.e., interrupt based) with respect to the requirements of RAN 4. Further, for NRSA SFTD measurements, DRX may also be based, where the UE performs measurements during DRX idle periods. Based on the current deployment, when the gNB/eNB cannot ensure that the UE can obtain the SFTD result using the configured gap, it is likely that the UE will not be configured with a gap for SFTD measurement. In this case, the UE must perform interrupt-based or DRX-based SFTD. For interrupt-based devices, the scheduling of the UE will be affected; for DRX based devices, SFTD performance cannot be guaranteed due to uncertainty of DRX idle time. Observation result 2: the interruption-based SFTD measurement may have a negative impact on the UE, while the DRX-based SFTD measurement may have poor performance. As mentioned above, current SFTD measurement mechanisms have certain limitations. Therefore, we propose a possible alternative that has less impact on the UE and may provide the network with an additional way to obtain timing difference information. Observation result 3: the UE in RRC _ IDLE/RRC _ INACTIVE does not need to perform data transmission and has more time to perform SFTD measurement, so SFTD measurement performance can be improved without affecting UE scheduling.

A better solution is that the SFTD measurement is in RRC _ IDLE/RRC _ INACTIVE state, and currently, the SFTD measurement should be performed by the UE in RRC _ CONNECTED state, and thus the measurement may interrupt the data transmission of the UE. However, for a UE in RRC IDLE/RRC INACTIVE state, such a problem does not occur because the UE is not scheduled to transmit data in IDLE mode, which means that SFTD measurements can be performed by the UE without negatively impacting the scheduling. In addition, the UE in the idle mode has more time to perform SFTD than the UE in the RRC _ CONNECTED state, and thus measurement performance of SFTD may be guaranteed (e.g., the UE may obtain a result of SFTD in a short time, and thus the network may acquire time difference information more promptly). Therefore, we suggest that SFTD measurements may be performed by UEs in RRC _ IDLE/RRC _ INACTIVE states.

Fig. 15 illustrates the general procedure of the proposed solution. As shown, there may be four steps, which may be specifically referred to the specific embodiment described in fig. 6-14 of the present application.

Step 1501: the network provides the SFTD measurement configuration or indication to the UE through an RRC release message or system information, which may include the target cell/frequency for the SFTD measurement.

Step 1502: the UE performs SFTD measurements in RRC _ IDLE/RRC _ INACTIVE state.

Step 1503: the network may ask the UE to report the SFTD result if necessary. The detailed mechanism remains to be studied further. For example, the network may send a query indication/message to a particular UE or in system information.

Step 1504: the UE reports the SFTD result according to a request of the network or a request without the network.

Please allow the UE to perform SFTD measurement in RRC _ IDLE state or RRC _ INACTIVE state.

Here, we should note that one thing, considering the mobility of the UE, other criteria may be needed in step 1504 to ensure that the SFTD result is reported to the correct gNB/eNB. For example, if the UE is camped on a cell that is not the earlier serving cell providing the SFTD measurement configuration/indication or is not the target cell for the SFTD measurement, the UE should discard the SFTD result rather than send it to an unrelated cell.

To avoid reporting the SFTD result to unrelated cells, the UE should discard the SFTD result when the current serving cell of the UE is not an earlier serving cell providing the SFTD measurement configuration/indication or is not a target cell for the SFTD measurement.

Current SFTD measures and presents two possible alternatives that provide the network with other ways to obtain timing difference information. Current SFTD measurements are optional UE capabilities, so the network may not have any UE on which to rely to obtain the time difference. The interruption-based SFTD measurement may have a negative impact on the UE, while the DRX-based SFTD measurement may have poor performance. The UE in RRC _ IDLE/RRC _ INACTIVE does not need to perform data transmission and has more time to perform SFTD measurement, so SFTD measurement performance can be improved without affecting UE scheduling.

Based on the above analysis, the embodiments of the present application allow the UE to perform SFTD measurements in the RRC _ IDLE state or the RRC _ INACTIVE state. Further, to avoid reporting the SFTD result to unrelated cells, the UE should discard the SFTD result when the current serving cell of the UE is not an earlier serving cell providing the SFTD measurement configuration/indication or is not a target cell for the SFTD measurement.

For example: when the terminal obtains the SFTD measurement configuration information in the SIB message of the cell1 on the cell1, the SFTD results of the cell1 and the cell 2 are measured. Before reporting the SFTD measurement result, the terminal reselects to the cell 3, obtains the SFTD measurement configuration information in the SIB message of the cell 3, and measures the SFTD measurement results of the cell 3 and the cell 2, and the cell 3 and the cell 4. The terminal enters an RRC _ CONNECTED state on the cell 3, and at the moment, SFTD measurement results of the cell 3, the cell 2 and the cell 3 and the cell 4 are only reported. When the terminal reselects back to the cell1 again and enters the RRC _ CONNECTED state on the cell1, the terminal can directly report the SFTD results of the cell1 and the cell 2.

For example, when the terminal obtains the SFTD measurement configuration information through RRC signaling on the cell1, the SFTD results of the cell1 and the cell 2 are measured in an RRC _ IDLE state. Before reporting the SFTD measurement result, the terminal reselects to the cell 3, enters the RRC _ CONNECTED state on the cell 3, and does not report the SFTD results of the cell1 and the cell 2. If the terminal obtains the SFTD measurement configuration information of the cell 3 through RRC signaling, the SFTD measurement results of the cell 3 and the cell 2 and the cell 3 and the cell 4 are measured in the RRC _ IDLE state, and when the terminal enters the RRC _ CONNECTED state again on the cell 3, the SFTD measurement results of the cell 3 and the cell 2 and the cell 3 and the cell 4 are reported. And if the terminal returns to the cell1 to reside and enters the RRC _ CONNECTED state, the terminal reports the SFTD results of the cell1 and the cell 2.

In the embodiment of the application, the SFTD measurement is carried out in the RRC _ IDLE state or the RRC _ INACTIVE state, and the SFTD measurement result is reported in the RRC _ CONNECTED state. Broadcasting a frequency point and a PCI list of a target cell in SIB information, measuring SFTD by a terminal in an RRC _ IDLE state or an RRC _ INACTIVE state, and reporting a result when/after RRC link establishment; and configuring SFTD measurement in an RRC _ IDLE state or an RRC _ INACTIVE state in the RRC _ CONNECTED state, measuring the SFTD by the terminal in the RRC _ IDLE state or the RRC _ INACTIVE state, and reporting a measurement result when/after RRC link establishment next time. The base station can configure an RSRP threshold and a time delay threshold more in actual network arrangement condition, when the RSRP of the serving cell is smaller than the RSRP threshold and the duration time of the RSRP is larger than the time delay threshold, the terminal carries out SFTD measurement in an RRC _ IDLE state or an RRC _ INACTIVE state, otherwise, the terminal does not carry out SFTD measurement;

the base station can configure an RSRP threshold and a time lag threshold according to the more practical network arrangement situation, when the duration that the RSRP of the serving cell is larger than the RSRP threshold is larger than the time lag threshold, the terminal carries out the SFTD measurement in the RRC _ IDLE state or the RRC _ INACTIVE state, otherwise, the SFTD measurement is not carried out.

As shown in fig. 16, the chip or chip system 1600 includes a baseband processor 1601, a transceiver or an interface 1602, a memory 1603, and the like, where the interface 1602 is configured to receive a code instruction and send the received code instruction to the processor 1601, and the processor 1610 executes the received code instruction sent by the interface, and executes a method and an action for improving a measurement capability of a terminal device according to an embodiment of the present application, and a specific manner of the measurement capability of the terminal device may be referred to in the embodiment of the present application and is not described herein again.

In some embodiments, the terminal device (or UE or terminal) 100 may be a mobile phone, a tablet Computer, a handheld Computer, a notebook Computer, an Ultra-mobile Personal Computer (UMPC), a netbook, a cellular phone, a Personal Digital Assistant (PDA), a wearable device (such as a smart watch), an Augmented Reality (AR) \ Virtual Reality (VR) device, and the like, and the embodiment does not specially limit the specific form of the device; the network device may be a base station (e.g., a GSM base station, an NB base station, an eNB base station, an NR base station, etc.), a server, a network element, etc., in this embodiment, an LTE (Long Term Evolution Advanced ("LTE") network system is taken as an example, that is, the network device and the user equipment are devices supporting LTE functions, and this embodiment may be extended to other network systems.

The network device 1 is a 4G base station, that is, an eNB, which supports an LTE function, and generally may include at least one serving cell (cell), that is, a serving cell1, according to a radio coverage of the eNB, where the cell is an area providing a wireless communication service for a user and is a basic component unit of a wireless network, and the eNB may also be divided into multiple cells, where each cell may use different wireless carriers, and each wireless carrier uses a certain carrier frequency point. For convenience of description, each cell corresponds to one network device, but not limited to this, one network device may also correspond to a plurality of different cells, including one primary cell and a plurality of secondary cells.

The method is used for SFTD measurement among cells in a mobile communication network, and comprises SFTD measurement between LTE PCell and NR PSCell under EN-DC supported by the current protocol, between NR PCell and LTE PSCell under NE-DC, between NR PCell and NR PSCell under NR-DC, between LTE PCell and NR adjacent cell under non-DC, and between cells of other systems.

It is clear to those skilled in the art that the embodiments of the present application can be implemented in hardware, or firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: the computer-readable medium may include RAM, ROM, an Electrically Erasable Programmable Read Only Memory (EEPROM), a compact disc read-Only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, the method is simple. Any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, the coaxial cable, the fiber optic cable, the twisted pair, the DSL, or the wireless technologies such as infrared, radio, and microwave are included in the fixation of the medium. Disk and disc, as used in accordance with embodiments of the present application, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

Claims

1. A method of system frame number and frame timing deviation (SFTD) measurement, the method being applicable to a terminal device, comprising:

the terminal equipment receives first information, wherein the first information comprises a first frequency point list and a Physical Cell Identity (PCI) list contained in each frequency point;

when the terminal equipment is in an IDLE state (RRC _ IDLE) or a non-activated state (RRC _ INACTIVE), the terminal equipment performs SFTD measurement according to the first information;

when the terminal device is in a CONNECTED state (RRC _ CONNECTED), the terminal device transmits an SFTD measurement report.

2. The method of claim 1, wherein the first information comprises at least one of a SIB, SIB2, SIB3, SIB4, SIB5, SIB 24.

3. The method of claim 1 or 2, wherein the terminal device sending the SFTD measurement report comprises:

and the terminal equipment sends an RRC Connection setup Complete message (RRC Connection Complete) to a network side, wherein the message comprises the SFTD measurement report.

4. The method of claim 1 or 2, wherein the first information comprises at least one or more of: the first information element is used for indicating the maximum frequency point number of the first frequency point list; the second cell is used for indicating the frequency point number of the first frequency point; and the third cell is used for indicating the cell PCI list on each frequency point.

5. The method according to claim 1 or 2, characterized in that before the terminal device is in CONNECTED state (RRC _ CONNECTED), the method comprises:

the terminal equipment initiates an RRC Connection Request message.

6. The method of claim 3, wherein when the RRC Connection Complete message comprises at least one or more of: a fourth information element for indicating SFTD measurement results between the camping cell and the target cell; a fifth information element for indicating the SFTD measurement report; a sixth information element for indicating a PCI list of the target cell; the seventh information element is for indicating the SFTD measurement report; a seventh information element for indicating SFN offset of the camped cell and a target cell; an eighth cell, configured to indicate a timing offset between the frame boundaries of the camped cell and the target cell, where the target cell is a neighboring cell for which a terminal device needs to perform SFTD.

7. The method according to claim 1 or 2, characterized in that before the terminal device is in CONNECTED state (RRC _ CONNECTED), the method comprises:

and the terminal equipment initiates to send an RRC Connection Resume Request message.

8. The method of claim 1 or 2, wherein the terminal device sending the SFTD measurement report comprises: and the terminal equipment sends an RRC Connection establishment completion message (RRC Connection Resume Complete) to a network side, wherein the message comprises the SFTD measurement report.

9. The method of claim 1 or 2, wherein the terminal device sending the SFTD measurement report comprises: the terminal device sends an RRC Connection Complete message (RRC Connection Complete) to the network side, where the message includes a ninth cell, and the first cell indicates the terminal device to obtain the SFTD measurement report.

10. The method of claim 3, wherein the method further comprises:

and the terminal equipment receives a first request, wherein the first request is used for indicating the terminal to report the SFTD measurement report.

11. The method of claim 10, wherein the method further comprises:

in response to the first request, the terminal device sends a first response, the first response comprising the SFTD measurement report.

12. The method of claim 1 or 2, wherein the terminal device sending the SFTD measurement report comprises:

the terminal device sends an RRC Connection setup recovery message (RRC Connection Resume Complete) to a network side, where the RRC Connection Resume Complete includes a first information element, and the first information element indicates the terminal device to obtain the SFTD measurement report.

13. The method of any of claims 1 or 2, further comprising:

14. The method of any of claims 1 or 2, further comprising:

15. The method of claim 1, wherein the first information is an RRC Connection Reconfiguration message, the Reconfiguration message summary includes a list of target frequency points, and each target frequency point optionally includes a PCI list of target cells on the frequency point.

16. The method of claim 15, wherein before the terminal device is in a CONNECTED state (RRC _ CONNECTED), the method comprises:

the terminal equipment sends an RRC Connection Request message;

the terminal device receives an RRC Connection Setup message.

17. The method of claim 16, wherein the method further comprises:

the terminal equipment sends an RRC ConnectionSetup Complete message, wherein the message comprises the SFTD measurement report.

18. The method according to claim 1 or 2, characterized in that before the terminal device is in CONNECTED state (RRC _ CONNECTED), the method comprises:

the terminal equipment initiates sending of an RRC Connection Resume Request message;

the terminal device sends an RRC connectionresponse message.

19. The method of claim 18, wherein the method further comprises:

and the terminal equipment sends an RRC Connection Resume Complete message, wherein the message comprises the SFTD measurement report.

20. An electronic device, comprising:

one or more processors;

a memory;

a plurality of application programs;

and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions which, when executed by the electronic device, cause the electronic device to perform the steps of:

receiving first information, wherein the first information comprises a first frequency point list and a Physical Cell Identity (PCI) list contained in each frequency point;

when the terminal device is in a CONNECTED state (RRC _ CONNECTED), the terminal device transmits the SFTD measurement report.

21. The method of claim 20, wherein the first information comprises at least one of a SIB, SIB2, SIB3, SIB4, SIB5, SIB 24.

22. The method of claim 20 or 21, wherein the terminal device sending the SFTD measurement report comprises:

23. The method of claim 20 or 21, wherein the first information comprises at least one or more of: a first cell maxsfstdidilemeascarriers for indicating the maximum frequency point number of the first frequency point list; a second cell carrierFreq for indicating the frequency point number of the first frequency point; a third cell measCellList-r15, for indicating the cell PCI list on each frequency point.

24. The method according to claim 20 or 21, wherein before the terminal device is in a CONNECTED state (RRC _ CONNECTED), the method comprises:

the terminal equipment initiates an RRC Connection Request message.

25. A chip system, comprising:

a memory storing instructions;

a processor for processing the received data, wherein the processor is used for processing the received data,

an interface for receiving code instructions and transmitting them to the processor, the processor being configured to execute the code instructions to perform a method comprising:

26. The method of claim 24, wherein the first information comprises at least one of a SIB, SIB2, SIB3, SIB4, SIB5, SIB 24.

27. The method of claim 23 or 24, wherein the terminal device sending the SFTD measurement report comprises: