CN110035443B

CN110035443B - Method, device and base station for auxiliary configuration of measurement gap in dual connectivity

Info

Publication number: CN110035443B
Application number: CN201810027237.7A
Authority: CN
Inventors: 邓云
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2018-01-11
Filing date: 2018-01-11
Publication date: 2022-08-02
Anticipated expiration: 2038-01-11
Also published as: CN110035443A

Abstract

The invention provides a method and a device for assisting in configuring a measurement gap during dual connectivity and a base station. The UE establishes EN-DC dual connection with a first base station and a second base station, and the method is applied to the first base station and comprises the following steps: determining an NR measurement frequency related to a measurement gap configuration of a UE which needs to be indicated to the second base station; and sending the NR measuring frequency and time window information of the reference signal of the adjacent area on the NR measuring frequency to the second base station, so that the second base station determines the measuring gap or modifies the configured measuring gap according to the time window information. The invention can realize that the main base station and the auxiliary base station provide necessary information for the other side when configuring the measurement gap so as to configure a reasonable measurement gap, so that the UE can measure the pilot frequency adjacent region during the measurement gap.

Description

Method, device and base station for auxiliary configuration of measurement gap in dual connectivity

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method, an apparatus, and a base station for assisting in configuring a measurement gap during dual connectivity.

Background

For a UE (User Equipment) in a connected state, if there is a service requirement, a base station may configure carrier aggregation for the UE. In carrier aggregation, the UE may use resources of multiple component carriers simultaneously for the purpose of high data transmission rate. The component carriers that typically implement carrier aggregation are all located at the same base station.

Dual connectivity (dual connectivity) is introduced in Release 12 and LTE (Long Term Evolution), so that the UE can simultaneously utilize resources of two base stations to perform data transmission, which not only can improve data throughput rate, but also can improve mobility performance, and data interaction between the two base stations requires a Long time, such as more than 2 ms.

For a UE in dual connectivity, a MeNB (Master eNB, a Master base station, or called a Master Node), MN, connected to the UE, is responsible for transmission of Radio Resource Control (RRC) signaling, and a SeNB (Secondary eNB, a Secondary base station, or called a Secondary Node), SN) is responsible for configuration of a SCG (Secondary Cell Group), and the SCG Cell configured by the SeNB needs to be sent to the UE through the MeNB by RRC signaling. Both MeNB and SeNB may configure multiple serving cells to the UE.

In 5G, since NR (New Radio, New air interface) is only used as a hot spot coverage, when data transmission needs to be performed using Radio resources of 5G, a terminal needs to support dual connectivity of LTE and NR, for example, a UE first accesses a base station of LTE and is in a connected state, and if there is a high-speed data transmission need, an available NR cell is configured for the UE by a base station (eNB) of LTE, so that the UE is in a dual connectivity state of LTE and NR, and Radio resources of LTE and NR can be fully utilized. Since NR and LTE belong to different Radio Access Technologies (RATs), when the NR base station (gNB) is used as a secondary base station, it needs to have a partial control function, such as generating a signaling for configuring parameters for the UE on the NR side and configuring measurement for the UE.

After the UE establishes LTE-NR dual connectivity (abbreviated as EN-DC), both the primary and secondary base stations configure the UE with measurements, such as the measurements that the UE needs to perform for certain NR frequencies. When NR pilot frequency measurement is configured, a measurement GAP (GAP) needs to be configured, so that the UE tunes its radio frequency to the pilot frequency to be measured during the measurement GAP to perform measurement tasks. The UE tunes its radio frequency to the serving frequency at the end of the measurement gap and then communicates with the serving cell. The measurement gap is periodic and may take different values of periodicity, or the measurement gap length may take different values such as 6ms, 4ms or 3 ms.

For a UE in EN-DC (E-UTRAN-NR Dual Connectivity ), if the UE only needs to measure LTE pilot frequency and NR pilot frequency lower than 6GHz (FR1), configuring the measurement gap of the UE by the main base station; if the UE needs to measure the NR pilot frequency (FR2) above 6GHz and measure the NR pilot frequency (or LTE frequency) below 6GHz, the primary base station configures the UE for measuring GAP1 of the NR pilot frequency (or LTE frequency) below 6GHz, and the secondary base station configures the GAP2 for measuring FR2, i.e. when the UE has two measurement GAPs.

Currently, only the main base station side in dual connectivity in LTE can configure measurement, and the measurement gap is configured by the main base station without the need for the secondary base station to provide any information. In LTE and NR dual connectivity, when an LTE base station is used as a primary base station, since both the primary base station and a secondary base station can configure inter-frequency measurement for the UE, if a measurement gap for FR1 needs to be configured, the measurement requirement of the secondary base station for the inter-frequency needs to be considered; meanwhile, when the LTE master base station needs to configure measurement for FR2, it needs to provide necessary information to the NR secondary base station so that the NR secondary base station can reasonably configure the measurement gap. Therefore, it is a problem to be solved that the main base station and the secondary base station provide which auxiliary information to each other when configuring the measurement gap.

Disclosure of Invention

The method, the device and the base station for auxiliary configuration of the measurement gap during dual connectivity provided by the invention can realize that the main base station and the auxiliary base station provide necessary information for the opposite side to configure a reasonable measurement gap when the measurement gap is configured, so that the UE can measure the pilot frequency adjacent region during the measurement gap.

In a first aspect, the present invention provides a method for assisting in configuring a measurement gap during dual connectivity, where a UE establishes an EN-DC dual connectivity with a first base station and a second base station, and the method is applied to the first base station, and the method includes:

determining an NR measurement frequency related to a measurement gap configuration of a UE which needs to be indicated to the second base station;

and sending the NR measuring frequency and time window information of the reference signal of the adjacent area on the NR measuring frequency to the second base station, so that the second base station determines the measuring gap or modifies the configured measuring gap according to the time window information.

Optionally, the sending, to the second base station, the NR measurement frequency and information of a time window of a reference signal in a vicinity of the NR measurement frequency includes: after receiving the measurement gap configured by the second base station and determining the NR measurement frequency related to the measurement gap configuration of the UE, which needs to be indicated to the second base station, when the measurement gap configured by the second base station cannot meet the requirement of inter-frequency measurement; or when the measurement gap configured by the second base station is not received, sending the NR measurement frequency and the time window information of the reference signal of the adjacent region on the NR measurement frequency to the second base station. Optionally, the time window information includes: and sending a time window of the reference signal by the adjacent cell, wherein the time window comprises the initial position, the duration and the period of the reference signal.

Optionally, the starting position, duration and period of the reference signal sent by the neighboring cell are set according to different neighboring cells; or the initial position, the duration and the period of the reference signal sent by the adjacent cells are the initial position, the duration and the period of a plurality of integrated reference signals sent by the adjacent cells; or the initial position, the duration and the period of the reference signal sent by the neighboring cell are respectively set according to different frequencies.

Optionally, the time window information includes: a proposed measurement gap configuration comprising a starting position of a measurement gap, a duration and a period of a measurement gap, or an offset value of a starting position of a measurement gap.

Optionally, the time window information includes: and the neighbor cell lists are respectively set according to different frequencies.

Optionally, the measurement gap is a measurement gap configured by the second base station for the UE;

the first base station configures NR measurement frequency for the UE, wherein the NR measurement frequency comprises NR pilot frequency, or comprises NR pilot frequency and NR co-frequency.

Optionally, the method further comprises:

and when the second base station configures the measurement gap or adjusts the current measurement gap, receiving the configured or adjusted measurement gap sent by the second base station.

In a second aspect, the present invention provides an apparatus for assisting in configuring a measurement gap during dual connectivity, where a UE establishes an EN-DC dual connectivity with a first base station and a second base station, the apparatus is located at the first base station, and the apparatus includes:

a determining unit, configured to determine an NR measurement frequency related to a measurement gap configuration of a UE that needs to be indicated to the second base station;

a sending unit, configured to send, to the second base station, the NR measurement frequency and time window information of a reference signal in an adjacent region on the NR measurement frequency, so that the second base station determines, according to the time window information, a measurement gap or whether to modify a configured measurement gap.

Optionally, the sending unit is configured to, after receiving the measurement gap configured by the second base station and determining an NR measurement frequency related to the measurement gap configuration of the UE and needing to be indicated to the second base station, determine that the measurement gap configured by the second base station cannot meet the requirement of inter-frequency measurement; or sending the NR measurement frequency and the time window information of the reference signal of the neighboring cell on the NR measurement frequency to the second base station when the measurement gap configured by the second base station is not received. Optionally, the time window information includes: and sending a time window of the reference signal by the adjacent cell, wherein the time window comprises the initial position, the duration and the period of the reference signal.

Optionally, the apparatus further comprises:

a receiving unit, configured to receive the configured or adjusted measurement gap sent by the second base station when the second base station configures the measurement gap or adjusts the current measurement gap.

In a third aspect, the present invention provides a base station, where the base station includes the above apparatus for assisting in configuring a measurement gap during dual connectivity.

The method, the device and the base station for auxiliary configuration of the measurement gap during dual connectivity provided by the embodiment of the invention can comprehensively consider the time windows of the reference signals sent by the adjacent regions on the pilot frequency to be measured, and realize that the main base station and the auxiliary base station provide necessary information for the opposite side to configure a reasonable measurement gap when the measurement gap is configured, so that the UE can measure the pilot frequency adjacent regions by using the configured measurement gap, and the requirement on mobility is met.

Drawings

Fig. 1 is a flowchart illustrating a method for assisting in configuring a measurement gap during dual connectivity according to an embodiment of the present invention; FIG. 2 is a diagram illustrating an EN-DC establishment procedure of a UE;

FIG. 3 is a diagram of SS block (PSS/SSS and PBCH) transmission by a cell at F3/F4;

fig. 4 is a schematic structural diagram of an apparatus for assisting in configuring a measurement gap during dual connection according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a method for assisting in configuring a measurement gap during dual connectivity, where UE establishes an EN-DC dual connectivity with a first base station and a second base station, and the method is applied to the first base station, and as shown in fig. 1, the method includes:

s11, determining the NR measuring frequency related to the UE measuring gap configuration which needs to be indicated to the second base station.

S12, sending the NR measurement frequency and time window information of the reference signal in the vicinity of the NR measurement frequency to the second base station, so that the second base station determines a measurement gap or whether to modify the configured measurement gap according to the time window information.

In this embodiment, when the inter-frequency measurement lower than 6GHz needs to be configured, the first base station is an NR base station (secondary base station), and the second base station is an LTE base station (primary base station); when the pilot frequency measurement higher than 6GHz needs to be configured, the first base station is an LTE base station (main base station), and the second base station is an NR base station (auxiliary base station).

The method for auxiliary configuration of the measurement gap during dual connectivity provided by the embodiment of the invention can comprehensively consider the time windows of the reference signals sent by the adjacent cells on the different frequency to be measured, and realize that the main base station and the auxiliary base station provide necessary information for the opposite side to configure a reasonable measurement gap when the measurement gap is configured, so that the UE can measure the different frequency adjacent cells by using the configured measurement gap, and the mobility requirement is met.

The method for assisting in configuring the measurement gap in dual connectivity according to the present invention is described in detail with reference to specific embodiments.

In the embodiment, the UE establishes EN-DC, and the LTE base station is used as a master base station, denoted by MeNB; the NR base station is denoted by SgNB as a secondary base station.

As shown in FIG. 2, the EN-DC establishment procedure is as follows:

1. the MeNB decides to request the SgNB to allocate resources for the E-RAB (Evolved Radio Access Bearer), indicating E-RAB characteristics (E-RAB parameters and transport network layer address information corresponding to the Bearer type). The MeNB indicates the requested SCG configuration information, including the complete UE capability and the UE capability negotiation result. The MeNB provides the latest measurement results for the SgNB to select the SCG cell. The MeNB may request the SgNB to allocate resources for a split SRB (Signaling Radio Bearer). SgNB decides whether to establish SRB 3. For SCG split bearers, the MeNB provides TNL (transport network layer) addresses and the maximum QoS (Quality of Service) levels that can be supported.

For MCG split bearer, the MeNB may request a certain amount of resources from the SgNB, and only the total resources allocated by the two base stations are required to meet the QoS requirement, and the QoS parameter indicated by the MeNB to the SgNB may not be consistent with the parameter received by the S1 interface.

For a certain E-RAB, the MeNB can directly request the SgNB to establish the SCG bearer or the MCG/SCG separated bearer without establishing the MCG bearer first.

2. If the SgNB accepts the request, it allocates radio resources and transport network resources for certain bearers. The SgNB determines PSCell (Primary Scell) and other SCG cells, and indicates SCG radio resource configuration to the MeNB by a SgNB request acknowledgement including an NR RRC configuration message. For SCG bearers and SCG split bearers, SgNB also needs to indicate the security algorithm and S1 downlink TNL address information. For a split bearer, TNL address information for data transmission also needs to be transferred between the two base stations.

For the SCG split bearer, the SgNB may request a certain amount of radio resources from the MeNB, and only the total resources allocated by the two base stations are required to meet the QoS requirement.

3. The MeNB sends an RRC connection reconfiguration to the UE, including unmodified NR RRC configuration information.

4. The UE applies the configuration and returns an RRC connection reconfiguration confirmation to the MeNB, including an NR RRC response. If the UE cannot apply the configuration therein, the UE performs a reconfiguration failure procedure.

5. The MeNB sends an SgNB reconfiguration complete containing an NR RRC response to the SgNB.

6. The UE synchronizes to the PSCell and initiates a random access procedure.

7. The MeNB sends sn (sequence number) state transitions to the SgNB.

8. The MeNB sends the forwarded data to the SgNB.

9-12, the MeNB triggers the core network to execute the path switching.

The core network includes an MME (Mobility Management Entity) and an S-GW (Serving Gateway).

The UE first accesses the MeNB, which configures the UE with measurements of certain NR frequencies (NR F1, F2, and F3). When the UE establishes dual connectivity, as in step 1 above, when the SgNB receives the secondary base station addition request, if dual connectivity establishment is allowed, the NR frequencies that the UE needs to measure may be configured at the same time (NRF1, F2, and F4). Assuming that the SgNB configures the SCG cell to include two serving cells on NR F1 and F2, for NR F3 and F4 to be measured are inter-frequency frequencies, and the UE measures adjacent cells on the two frequencies, it needs to perform measurement through a measurement gap. It should be noted that as the serving cell of the UE changes, the inter-frequency also changes. Here all frequencies lie below 6 GHz.

The following three possible schemes for measurement gap configuration are possible:

scheme 1: the MeNB configures the measurement gap when configuring the UE to perform measurements of NR F1, F2, F3. And then sending the configuration of the measurement gap to the SgNB by a secondary base station increase request. SgNB decides SCG cells and decides to increase the measurement of NR F4. The UE measures SS Block (synchronization signal Block) and/or CSI-RS (Channel State Information Reference Signals) of an adjacent cell on F4, the SS Block and CSI-RS of a cell are not transmitted by each slot base station, and are transmitted according to a certain period, such as a period of 10ms, 20ms, 40ms, 80ms, and the like, each time the SS Block and CSI-RS of a cell transmit a part of symbols occupying one slot or a plurality of slots, the length of the slot is related to the subcarrier interval, one slot is 1ms at the subcarrier interval of 15kHz, and one slot is 0.5ms at the subcarrier interval of 30 kHz. Therefore, in order for the UE to measure the neighbor cell on F4, it is necessary to make the neighbor cell transmit SS Block or CSI-RS exactly within the measurement gap window. As shown in fig. 3, which is a schematic diagram of transmitting SS Block (PSS/SSs and PBCH) in a cell of F3/F4, the transmission timings of SS Block or CSI-RS in different adjacent cells on the same frequency are not necessarily the same. The SgNB expects the UE to measure the neighbor on NR F4, and therefore, the SgNB determines whether the current measurement gap can satisfy the measurement of NR F4 according to the current measurement gap and the time when the neighbor on F4 sends SS Block or CSI-RS, if so, the SgNB does not need to provide any information to the MeNB to assist the MeNB in configuring the measurement gap, that is, no additional information for configuring the measurement gap needs to be indicated in the secondary base station increase response, and the MeNB maintains the current measurement gap configuration after receiving the secondary base station increase response; if not, the SgNB needs to indicate NR F4 frequency information that needs to be measured and time window information that needs to measure SS Block or CSI-RS of the neighborhood on F4. Specific possibilities for time window information:

(1) and the time window of the neighbor cell sending the SS Block or the CSI-RS, such as the starting position, the duration and the period of the SS Block or the CSI-RS. Duration and period are optionally provided. The initial position, duration and period of sending the reference signal by the adjacent cell can be set according to different frequencies; or providing a starting position, duration and period of a plurality of comprehensive neighbor cell sending reference signals. The time window provided is not necessarily the same as the window for transmitting the reference signal at the time of the neighboring cell, and for example, the time duration may be longer and the period may be a multiple of the actual transmission of the reference signal.

(2) Directly indicating a proposed measurement gap configuration, such as the start position, duration and period of the measurement gap (or a Pattern indicating the measurement gap), the duration and period being optionally provided. An offset value (offset value from system frame number 0) of the start position of the measurement gap can be given.

(3) And indicating the neighbor cell list needing to be measured, and determining whether to modify the configuration of the measurement gap by the MeNB according to the neighbor cell list to be measured and the self-mastered time for sending the reference signals of the neighbor cells.

For certain intra-frequency NR measurement frequencies (i.e. the frequency measured by the UE is configured to be the same as the current serving frequency of the UE), if the Numerology of the neighbor cell on the frequency is different from the Numerology of the serving cell (i.e. Scell) on the frequency, the UE needs to measure the neighbor cell on the frequency for a measurement gap, so the secondary base station needs to provide the time window information of SS Block or CSI-RS of the neighbor cells on these intra-frequency frequencies to the primary base station. For the same-frequency frequencies which can be measured without measuring gaps, the secondary base station does not need to provide the time window information of SS Block or CSI-RS of the adjacent regions on the same-frequency frequencies to the main base station.

Scheme 2: the SgNB receives the measurement gap currently configured by the MeNB and determines that the UE needs to be configured to measure the pilot frequency NR F4, and the SgNB does not determine whether the current measurement gap can meet the measurement requirement of F4, and always provides the frequency information of the NR F4 that needs to be measured and the time window information of the SSBlock or CSI-RS that needs to be measured in the adjacent area on F4 to the MeNB.

Scheme 3: when the MeNB does not configure the measurement gap, but the MeNB expects to configure the measurement gap for inter-frequency measurement, at this time, the SgNB needs to indicate to the MeNB the measurement gap needed, and also indicates the NR inter-frequency needed to be measured and the time window of the reference signal in the adjacent region on the frequency.

The MeNB receives the information of the auxiliary configuration measurement gap sent by the SgNB, and the MeNB may adjust the current measurement gap or maintain the current measurement gap. If the measurement gap is adjusted, the MeNB needs to send the adjusted measurement gap to the SgNB.

The three schemes are the scenarios in which the MeNB needs to configure the inter-frequency measurement lower than 6GHz, and for the scenarios in which the MeNB needs to configure the inter-frequency measurement higher than 6GHz, the MeNB needs to provide the SgNB with information for configuring the FR2 measurement gap in an auxiliary manner (i.e., the measurement gap applied to the FR2 frequency that needs to be measured higher than 6 GHz).

An embodiment of the present invention further provides a device for assisting in configuring a measurement gap during dual connectivity, where a UE establishes an EN-DC dual connectivity with a first base station and a second base station, the device is located at the first base station, and as shown in fig. 4, the device includes:

a determining unit 11, configured to determine an NR measurement frequency related to a measurement gap configuration of a UE that needs to be indicated to the second base station;

a sending unit 12, configured to send the NR measurement frequency and time window information of the reference signal in the vicinity of the NR measurement frequency to the second base station, so that the second base station determines a measurement gap according to the time window information or determines whether to modify the configured measurement gap.

The device for auxiliary configuration of the measurement gap during dual connectivity provided by the embodiment of the invention can comprehensively consider all time windows of reference signals sent by adjacent cells on different frequencies to be measured, and realize that the main base station and the auxiliary base station provide necessary information for the opposite side to configure reasonable measurement gaps when the measurement gaps are configured, so that the UE can measure the adjacent cells of different frequencies by using the configured measurement gaps, and the mobility requirement is met.

Optionally, the sending unit 12 is configured to, after receiving the measurement gap configured by the second base station and determining an NR measurement frequency related to the measurement gap configuration of the UE and needing to be indicated to the second base station, when it is determined that the measurement gap configured by the second base station cannot meet the requirement of inter-frequency measurement; or when the measurement gap configured by the second base station is not received, sending the NR measurement frequency and the time window information of the reference signal of the adjacent region on the NR measurement frequency to the second base station.

Optionally, the time window information includes: and sending a time window of the reference signal by the adjacent cell, wherein the time window comprises the initial position, the duration and the period of the reference signal.

Optionally, the apparatus further comprises:

The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.

The embodiment of the invention also provides a base station which comprises the device for assisting in configuring the measurement gap during the double connection.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for assisting in configuring a measurement gap during dual connectivity, wherein a UE establishes an EN-DC dual connectivity with a first base station and a second base station, and the method is applied to the first base station, and the method comprises:

after receiving the measurement gap configured by the second base station and determining the NR measurement frequency related to the measurement gap configuration of the UE that needs to be indicated to the second base station, determining whether the measurement gap configured by the second base station can meet the requirement for inter-frequency measurement, and when determining that the measurement gap configured by the second base station cannot meet the requirement for inter-frequency measurement or when not receiving the measurement gap configured by the second base station, sending time window information of the NR measurement frequency and a reference signal in an adjacent region on the NR measurement frequency to the second base station, so that the second base station determines the measurement gap or whether to modify the configured measurement gap according to the time window information.

2. The method of claim 1, further comprising:

when the measurement gap configured by the second base station is judged to meet the requirement of inter-frequency measurement, no information is required to be provided for the second base station to assist the second base station to configure the measurement gap.

3. The method of claim 1 or 2, wherein the time window information comprises: and sending a time window of the reference signal by the adjacent cell, wherein the time window comprises the initial position, the duration and the period of the reference signal.

4. The method of claim 3, wherein the starting position, duration and period of the reference signal sent by the neighboring cells are set according to different neighboring cells; or the initial position, the duration and the period of the reference signal sent by the adjacent cell are the initial position, the duration and the period of a plurality of integrated reference signals sent by the adjacent cells; or the initial position, the duration and the period of the reference signal sent by the neighboring cell are respectively set according to different frequencies.

5. The method of claim 1 or 2, wherein the time window information comprises: a proposed measurement gap configuration comprising a starting position of a measurement gap, a duration and a period of a measurement gap, or an offset value of a starting position of a measurement gap.

6. The method of claim 1 or 2, wherein the time window information comprises: and the neighbor cell lists are respectively set according to different frequencies.

7. The method according to claim 1 or 2, wherein the measurement gap is a measurement gap configured by the second base station for the UE;

8. The method of claim 2, further comprising:

9. An apparatus for assisting in configuring a measurement gap during dual connectivity, wherein a UE establishes an EN-DC dual connectivity with a first base station and a second base station, and wherein the apparatus is located at the first base station, the apparatus comprising:

a sending unit, configured to determine whether the measurement gap configured by the second base station can meet a requirement for inter-frequency measurement after receiving the measurement gap configured by the second base station and determining an NR measurement frequency related to measurement gap configuration of the UE that needs to be indicated to the second base station, and send, when determining that the measurement gap configured by the second base station cannot meet the requirement for inter-frequency measurement or when not receiving the measurement gap configured by the second base station, time window information of the NR measurement frequency and a reference signal in an adjacent area on the NR measurement frequency to the second base station, so that the second base station determines the measurement gap or whether to modify the configured measurement gap according to the time window information.

10. The apparatus of claim 9, wherein the sending unit is further configured to, when it is determined that the measurement gap configured by the second base station can meet the requirement of inter-frequency measurement, not need to provide any information to the second base station to assist the second base station in configuring the measurement gap.

11. The apparatus of claim 9 or 10, wherein the time window information comprises: and sending a time window of the reference signal by the adjacent cell, wherein the time window comprises the initial position, the duration and the period of the reference signal.

12. The apparatus of claim 11, wherein the starting position, duration and period of the reference signal transmitted by the neighboring cells are set according to different neighboring cells; or the initial position, the duration and the period of the reference signal sent by the adjacent cell are the initial position, the duration and the period of a plurality of integrated reference signals sent by the adjacent cells; or the initial position, the duration and the period of the reference signal sent by the neighboring cell are respectively set according to different frequencies.

13. The apparatus of claim 9 or 10, wherein the time window information comprises: a proposed measurement gap configuration comprising a starting position of a measurement gap, a duration and a period of a measurement gap, or an offset value of a starting position of a measurement gap.

14. The apparatus of claim 9 or 10, wherein the time window information comprises: and the neighbor cell lists are respectively set according to different frequencies.

15. The apparatus according to claim 9 or 10, wherein the measurement gap is a measurement gap configured by the second base station for a UE;

16. The apparatus of claim 10, further comprising:

17. A base station, characterized in that it comprises means for assisting in configuring measurement gaps in case of dual connectivity according to any of claims 9 to 16.