CN103118408A - Small region measuring method and method, device and system of small region measuring and switching - Google Patents

Abstract

The invention provides a method of small region measuring and switching. The method comprises that user unified equipment (UE) respectively measures receipt signals of different sector antennas by utilizing at least two sector antennas; a small region is not required to be switched when a wireless far-end unit remote radio unit (RRU) belongs to a same distributed base unit (BBU), wherein the UE is located in the RRU; a base station confirms that whether the small region needs to be switched when the RRU belongs to different BBUs. The invention further discloses a small region measuring method, device and system of small region measuring and switching. When embodiments of the small region measuring method and the method, a device and a system of the small region measuring and switching are utilized, small region search time is reduced and accordingly call drop rate is reduced.

Description

Cell measurement method, cell measurement and handover method, device and system

technical field

The present invention relates to the field of communication technologies, and more specifically, to a cell measurement method, a method, a device and a system for cell measurement and handover.

Background technique

In the communication system, a distributed baseband unit (BBU) + wireless remote unit (RRU) solution can be used for networking. The number of RRUs can be adjusted according to the coverage of a single cell. See accompanying drawing 1 for specific embodiment. In Figure 1, one BBU contains two RRUs, and the coverage of different RRUs belongs to the same cell. In this way, compared with the networking solution of a single RRU, the coverage of a single cell can be expanded, thereby reducing the number of UE handovers, reducing the call drop rate, and improving user communication experience. At the same time, since the number of BBUs is reduced, the cost of network deployment can also be reduced for operators.

For the UE in the high-speed railway communication system, due to the high-speed movement of the train, the UE moves relatively fast. In the same time, the UE needs to pass through multiple different cells, so frequent cell searches and handovers are required. , to ensure continuous communication of the UE. The distributed BBU+RRU solution is especially suitable for private network communication systems, such as the high-speed rail private network communication system specially established for the communication needs of users on trains. The number of RRUs under one BBU can be selected according to needs.

In a common distributed BBU+RRU networking solution, the signal overlapping coverage area of two RRUs is about 500 meters, as shown in Figure 1 . If the two RRUs belong to different BBUs, the two RRUs belong to two different cells. Since the UE moves faster on the high-speed train, and the overlapping coverage area of two RRUs of different cells is small, the UE needs to be handed over from one cell to another cell in a short period of time. In this case, the UE needs to switch from one cell to another in a short period of time, and the UE will experience multiple different cells in the same time, so the UE needs to perform frequent cell search and handover, thereby increasing The call drop rate is reduced, and the user communication experience is reduced.

Contents of the invention

The embodiment of the present invention proposes a cell measurement method. The UE uses at least two sectorized antennas to measure the received signals respectively to obtain signal measurement results in different directions, which increases the uplink transmission link of the UE in different directions. At the same time, the number of measurements on adjacent cells is increased, and the UE can complete the cell search in a relatively long period of time, which increases the success rate of handover, thereby reducing the call drop rate of the UE call.

The embodiment of the present invention also proposes a method for cell measurement and handover. The UE uses at least two sectorized antennas to measure the received signals respectively to obtain signal measurement results in different directions, which increases the UE's ability to measure uplink signals in different directions. The selectivity and accuracy of the transmission link; at the same time, the number of measurements on adjacent cells is increased, and the UE can complete the cell search in a relatively long time, which increases the success rate of handover, thereby reducing the call drop rate of the UE call .

The embodiment of the present invention also proposes a device for cell measurement and handover. The UE uses at least two sectorized antennas to measure the received signals respectively to obtain signal measurement results in different directions, which increases the UE's ability to measure uplink signals in different directions. The selectivity and accuracy of the transmission link; at the same time, the number of measurements on adjacent cells is increased, and the UE can complete the cell search in a relatively long time, which increases the success rate of handover, thereby reducing the call drop rate of the UE call .

The embodiment of the present invention also proposes a system for cell measurement and handover. The UE uses at least two sectorized antennas to measure the received signals respectively to obtain signal measurement results in different directions, which increases the UE's ability to measure uplink signals in different directions. The selectivity and accuracy of the transmission link; at the same time, the number of measurements on adjacent cells is increased, and the UE can complete the cell search in a relatively long time, which increases the success rate of handover, thereby reducing the call drop rate of the UE call .

The technical scheme of the embodiment of the present invention is as follows:

A method for cell measurement, the method comprising:

The user UE uses at least two sectorized antennas to measure the received signals of different sectorized antennas respectively;

The UE determines the measurement result.

The determination of the measurement result by the UE includes: the wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, then the UE takes the maximum value according to the sectorized antenna, the sectorized antenna for uplink data transmission or the sector for downlink data reception For a regionalized antenna, one measurement is selected among at least two measurements.

The UE determining the measurement results includes: the RRU where the UE is located belongs to different BBUs, and the UE obtains at least two measurement results and corresponding IDs by measuring received signals of sectorized antennas.

A method for cell measurement and handover, the method comprising:

The user UE uses at least two sectorized antennas to measure the received signals of different sectorized antennas respectively;

The wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, and it is determined that no cell handover is required;

The RRU where the UE is located belongs to different BBUs, and the base station determines whether cell handover is required.

The determining by the base station whether cell handover is required includes:

Reporting the measurement results of at least two cells obtained through measurement and the cell identities corresponding to the cells to the base station;

The base station determines whether to perform cell handover according to the measurement result and the cell flag.

The determining that cell handover is not required includes: reporting one of the at least two measurement results and the cell identifier to the base station.

A device for cell measurement and handover, the device comprising:

A sectorized antenna is used for receiving downlink data;

The control module is used to measure the received signals of different sector antennas respectively, and send the measurement results to the base station;

The handover module is used to receive an instruction sent by the base station to perform cell handover.

The control module includes a measurement unit and a reporting unit,

The measuring unit is used to measure the received signals of different sector antennas respectively;

The reporting unit, when the wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, sends one of the at least two measurement results and the cell identity to the base station; when the RRU where the UE is located does not belong to the same BBU, Then at least two measurement results and corresponding cell identities are sent to the base station.

A system for cell measurement and handover, said system comprising: a device for cell measurement and handover and a base station,

The device for cell measurement and switching includes a sectorized antenna, a control module and a switching module;

A sectorized antenna is used for receiving downlink data;

The control module is used to measure the received signals of different sector antennas respectively, and send the measurement results to the base station;

A handover module, configured to receive instructions sent by the base station to perform cell handover;

The base station is used for receiving measurement results and sending instructions to the switching module.

The control includes a measurement unit and a reporting unit,

The measuring unit is used to measure the received signals of different sector antennas respectively;

The reporting unit, when the wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, sends one of the at least two measurement results and the cell identity to the base station; when the RRU where the UE is located does not belong to the same BBU, Then at least two measurement results and corresponding cell identities are sent to the base station.

It can be seen from the above technical solutions that in the embodiment of the present invention, the UE uses at least two sectorized antennas, and measures the received signals of different sectorized antennas respectively; if the received signals of different sectorized antennas of the UE Belonging to the same cell, that is, the same BBU, without cell handover, select one measurement result from at least two measurement results and report it to the base station together with the cell ID. If the signals received by different sectorized antennas of the UE belong to different cells, that is, different BBUs, the UE reports the measurement results of at least two cells and the corresponding cell IDs to the base station. The base station receives the measurement results of at least two cells reported by the UE, and the base station decides whether the UE performs cell handover. If the corresponding conditions are met, the UE is notified to perform cell handover.

The UE uses at least two sectorized antennas to measure the received signals separately to obtain signal measurement results in different directions, which increases the selectivity and accuracy of the UE for uplink transmission links in different directions; The number of measurements of adjacent cells allows the UE to complete cell search within a relatively long period of time, thereby increasing the success rate of handover and reducing the call drop rate of UE calls.

Description of drawings

FIG. 1 is a schematic diagram of a distributed BBU+RRU network in the prior art;

FIG. 2 is a schematic flowchart of a method for cell measurement and handover according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of UEs in the same BBU according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a UE in different BBUs according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a system for cell measurement and handover according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the embodiment of the present invention, the UE uses at least two sectorized antennas, and measures the received signals of different sectorized antennas separately; if the received signals of different sectorized antennas of the UE belong to the same cell, that is, the same BBU, Then select one of the at least two measurement results and report it to the base station together with the cell ID; if the received signals of different sectorized antennas of the UE belong to different cells, that is, different BBUs, then the UE will report the measurement results of at least two cells and the corresponding cell ID are reported to the base station. The base station receives the measurement results of at least two cells reported by the UE, and the base station decides whether the UE performs cell handover. If the corresponding conditions are met, the base station notifies the UE to perform cell handover.

The UE uses at least two sectorized antennas to measure the received signals separately to obtain signal measurement results in different directions, which increases the selectivity and accuracy of the UE for uplink transmission links in different directions; The number of measurements of adjacent cells allows the UE to complete cell search within a relatively long period of time, thereby increasing the success rate of handover and reducing the call drop rate of UE calls.

It should be noted that: for the private network communication system of the high-speed railway, the UE can be an on-board system on the train, and its sectorized antenna is an antenna installed outside the train.

Referring to accompanying drawing 2, it is a schematic flow diagram of a method for cell measurement and handover, which specifically includes the following steps:

In step 201, the UE uses at least two sectorized antennas to measure received signals of different sectorized antennas respectively.

In the present invention, the UE uses at least two sectorized antennas to measure the received signals of different sectorized antennas respectively. Since the sectorized antenna has a certain directionality, the UE can only measure the received signal in a certain direction by using the sectorized antenna.

In step 202, the UE selects one measurement result and its corresponding cell ID from at least two measurement results, and reports it to the base station.

The received signals of different sectorized antennas belong to the same BBU, that is, the same cell, and one of the measurement results among the measurement results of different sectorized antennas and its corresponding cell ID are reported to the base station.

When the received signals of different sectorized antennas of UE belong to the same cell, according to the principle of taking the maximum value of different sectorized antennas, the sectorized antenna for uplink data transmission or the sectorized antenna for downlink data reception, in at least two measurements Select a measurement result from the results and report it to the base station together with the cell ID.

Taking the maximum value for different sectorized antennas: compare the measurement results of at least two sectorized antennas of the UE, and take the largest measurement result and report it together with the corresponding cell ID.

Sectorized antenna for uplink data transmission: If the UE performs antenna selection for uplink data transmission, that is, the UE selects one of at least two sectorized antennas for uplink data transmission during uplink transmission, and selects for uplink data transmission. The downlink measurement results of the data transmission antennas are reported together with the corresponding cell IDs.

Sectorized antenna for downlink data reception: If the UE performs antenna selection when receiving downlink data, that is, when the UE performs downlink data reception processing, it only selects the downlink data of at least one of the two sectorized antennas for processing , the downlink measurement result of the antenna for downlink data transmission is selected and the corresponding cell ID is reported together.

Referring to FIG. 3 , UE receives downlink data through sectorized antenna 1 and sectorized antenna 2 respectively. The two sectorized antennas receive signals in different directions, and the UE performs measurements separately. Among the two measurement results, the maximum value is taken according to the different sectorized antennas, the sectorized antenna for uplink data transmission or the sector for downlink data reception. The regionalized antenna principle selects a measurement result, and reports the measurement result together with the cell ID to the base station. Since the RRU0, RRU1, RRU2 and RRU3 where the UE is located belong to the same BBU, that is, belong to the same cell, the measurement results of different sectorized antennas of the UE belong to the same cell. The base station adjusts the modulation and coding scheme (MCS) and the quality indicator (CQI) according to the measurement results reported by the UE.

Step 203, the UE reports different measurement results and corresponding cell IDs to the base station.

The received signals of different sectorized antennas belong to different BBUs, that is, different cells, and the measurement results of different sectorized antennas are processed as follows.

When signals received by different sectorized antennas of the UE belong to different cells, the measurement results of at least two cells and corresponding cell IDs are reported to the base station together. Referring to FIG. 4 , the UE receives downlink data through sectorized antenna 1 and sectorized antenna 2 respectively. The two sectorized antennas respectively receive signals from different directions, and the UE performs measurement respectively, and reports the different measurement results together with the corresponding cell ID to the base station among the two measurement results. The RRU2 and RRU3 where the UE is located belong to the BBU1, and the RRU0 and RRU1 mentioned by the UE belong to the BBU2, so the measurement results of different sectorized antennas of the UE belong to different cells.

Wherein, the technical solutions in steps 201 to 203 can also be used to perform cell measurement.

Step 204, the base station determines whether the UE performs handover according to the measurement result reported by the UE.

The base station determines whether the UE performs handover according to the measurement result reported by the UE. Specifically, according to criteria such as whether the measured signal of the adjacent cell is greater than a certain threshold value, whether the signal quality of the adjacent cell is better than that of the current cell, and whether the measured signal of the current cell is worse than a certain threshold value, the Whether the UE performs cell handover. If the corresponding conditions are met, the UE is notified to perform cell handover. It is the prior art to decide whether the UE performs handover according to the above criteria.

Since the UE uses a sectorized antenna to measure signals in different directions, the cell measurement results are reported to the base station, and the base station determines the cell handover. By adopting the above solution, the accuracy of measurement is increased, the time for UE handover is prolonged, the call drop rate is further reduced, and the success rate of UE handover is increased at the same time.

Referring to accompanying drawing 5 is a schematic diagram of the system structure of cell measurement and handover, including:

The system includes a cell measurement and switching device and a base station. Wherein, the device for cell measurement and handover includes: a sectorized antenna 501 , a control module 502 and a handover module 503 .

The sectorized antenna 501 is used for receiving downlink data.

The control module 502 is configured to measure the received signals of different sector antennas respectively, and send the measurement results to the base station.

The control module 502 includes a measuring unit 5021 and a reporting unit 5022 .

The measuring unit 5021 is configured to measure signals of different sectorized antennas, and send the measurement results and corresponding cell identities to the reporting unit 5022 .

The reporting unit 5022, when the wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, sends one of the at least two measurement results and the cell identity to the base station; when the RRU where the UE is located does not belong to the same BBU , then at least two measurement results and corresponding cell identities are sent to the base station.

The handover module 503 is configured to receive an instruction sent by the base station to perform cell handover.

The base station 504 is configured to receive the measurement result and send an instruction to the switching module 503 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A method for cell measurement, characterized in that the method comprises: The user UE uses at least two sectorized antennas to measure the received signals of different sectorized antennas respectively; The UE determines the measurement result. 2. The method for cell measurement according to claim 1, wherein the determination of the measurement result by the UE comprises: the wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, then the UE takes The maximum value, the sectorized antenna for uplink data transmission or the sectorized antenna for downlink data reception, select one measurement result from at least two measurement results. 3. The method for cell measurement according to claim 1, wherein the determination of the measurement result by the UE comprises: the RRU where the UE is located belongs to different BBUs, and the UE obtains at least two measurement results by measuring the received signal of the sectorized antenna Result and corresponding ID. 4. A method for cell measurement and handover, characterized in that the method comprises: The user UE uses at least two sectorized antennas to measure the received signals of different sectorized antennas respectively; The wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, and it is determined that no cell handover is required; The RRU where the UE is located belongs to different BBUs, and the base station determines whether cell handover is required. 5. The method for cell measurement and handover according to claim 4, characterized in that, determining whether a cell handover is required by the base station comprises: Reporting the measurement results of at least two cells obtained through measurement and the cell identities corresponding to the cells to the base station; The base station determines whether to perform cell handover according to the measurement result and the cell flag. The method for cell measurement and handover according to claim 4, wherein the determining that no cell handover is required comprises: reporting one of the at least two measurement results and the cell identity to the base station. 7. A device for cell measurement and handover, characterized in that the device comprises: A sectorized antenna is used for receiving downlink data; The control module is used to measure the received signals of different sector antennas respectively, and send the measurement results to the base station; The handover module is used to receive an instruction sent by the base station to perform cell handover. 8. The device for cell measurement and handover according to claim 7, wherein the special feature is that the control module includes a measurement unit and a reporting unit, The measuring unit is used to measure the received signals of different sector antennas respectively; The reporting unit, when the wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, sends one of the at least two measurement results and the cell identity to the base station; when the RRU where the UE is located does not belong to the same BBU, Then at least two measurement results and corresponding cell identities are sent to the base station. 9. A system for cell measurement and handover, characterized in that the system includes: a device for cell measurement and handover and a base station, The device for cell measurement and switching includes a sectorized antenna, a control module and a switching module; A sectorized antenna is used for receiving downlink data; The control module is used to measure the received signals of different sector antennas respectively, and send the measurement results to the base station; A handover module, configured to receive instructions sent by the base station to perform cell handover; The base station is used for receiving measurement results and sending instructions to the switching module. 10. The device for cell measurement and handover according to claim 9, wherein the control includes a measurement unit and a reporting unit, The measuring unit is used to measure the received signals of different sector antennas respectively; The reporting unit, when the wireless remote unit RRU where the UE is located belongs to the same distributed baseband unit BBU, sends one of the at least two measurement results and the cell identity to the base station; when the RRU where the UE is located does not belong to the same BBU, Then at least two measurement results and corresponding cell identities are sent to the base station.

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