CN105979506A - Method and system for controlling small cells, and base station - Google Patents
Method and system for controlling small cells, and base station Download PDFInfo
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Abstract
Embodiments of the invention disclose a method and a system for controlling small cells, and a base station. The method comprises the following steps: receiving the small cell group identifier reported by each small cell; generating a small cell group according to the small cell group identifier of each small cell; and configuring a cell identifier for each small cell in the small cell group to enable the small cells in the small cell group to schedule and launch UE connected to the small cells in a unified way according to the configured cell identifiers. By implementing the embodiments of the invention, a macro base station can configure cell identifiers for the small cells in the same small cell group in a unified way, so that the small cells in the same small cell group can schedule and launch UE connected to the small cells in a unified way according to grouping, namely, the UE connected to the small cells can take the small cells as one cell. Thus, the UE can identify signals emitted by the small cells, and cell identifier conflict is avoided.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a system, and a base station for controlling a small cell.
Background
Small Cell Networks (SCNs) refer to a heterogeneous network formed by a macro base station and Small base stations after a plurality of low-power Small base stations are placed in the coverage area of the macro base station. The macro base station corresponds to a macro cell, the plurality of small base stations correspond to a plurality of small cells respectively, in the SCNs network, the macro cell is used for ensuring a wide coverage area, and the plurality of small cells are used for bearing services. In the prior art, each small Cell in the SCNs network is configured with a Cell identifier (Cell _ ID), and each small Cell transmits a Synchronization Signal (SS) according to the Cell identifier of each small Cell, so that a User Equipment (UE) determines the Cell identifier of the small Cell by detecting the SS, thereby completing a process of accessing the small Cell, and then each small Cell performs scheduling service on the UE connected thereto independently.
The inventor finds in the research process of the prior art that, due to the limited number of cell identifiers, when the number of small cells in the coverage area of a macro cell exceeds the number of cell identifiers, if a cell identifier is randomly configured for each small cell, at least two small cells are configured to the same cell identifier, and since scheduled transmissions of the small cells configured with the same cell identifier are independent, different UEs accessing the small cells cannot identify serving small cells according to the small cell identifiers, so that signals transmitted by the small cells cannot be correctly distinguished, thereby causing cell identifier collision.
Disclosure of Invention
The embodiment of the invention provides a method, a system and a base station for controlling small cells, which are used for solving the problem that cell identification conflict is easily caused by randomly configuring cell identifications for small cells in SCNs in the prior art.
In order to solve the technical problem, the embodiment of the invention discloses the following technical scheme:
in a first aspect, a method for controlling a small cell is provided, the method comprising:
receiving small cell grouping identifiers of respective small cells reported by each small cell;
generating a small cell group according to the small cell group identifier of each small cell, wherein the small cells contained in the small cell group have the same small cell group identifier;
configuring a cell identifier for the small cell in the small cell group, so that the small cell in the small cell group performs unified scheduling transmission on User Equipment (UE) accessing to the small cell according to the configured cell identifier.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the configuring a cell identifier for a small cell in the small cell group includes:
configuring the same cell identification for the small cells in the small cell group; or,
configuring a cell identifier for the small cell in the small cell group according to the load condition of the small cell group.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the configuring, according to a load situation of the small cell group, a cell identifier for a small cell in the small cell group includes:
acquiring the load of the small cell group, wherein the load of the small cell group is the sum of the loads reported by each small cell in the small cell group;
configuring a different cell identity for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configuring the same cell identity for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the method further includes:
controlling each small cell in the small cell group to be turned on when the load of the small cell group exceeds a second load threshold, and setting the transmission power of a cell-specific reference signal (CRS) of each small cell to be a default value, wherein the second load threshold is smaller than the first load threshold;
when the load of the small cell group does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of CRSs of the rest small cells except the at least one small cell, and informing the UE within the coverage of the small cell group of the increased transmission power of the CRS.
With reference to the first aspect, or the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, or the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, after configuring a cell identifier for a small cell in the small cell group, the method further includes:
receiving a system updating request message sent by a first small cell, wherein the system updating request message comprises updated system parameters;
sending a system update message containing the updated system parameters to small cells other than the first small cell in a small cell group in which the first small cell is located;
or,
receiving a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell in a small cell group in which the second small cell is located, except for the second small cell.
In a second aspect, another method for controlling a small cell is provided, the method comprising:
reporting the small cell grouping identification of the small cell to a macro base station;
receiving a cell identifier configured by the macro base station for the small cell, wherein the cell identifier is a cell identifier configured by the macro base station for a small cell in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell, and small cells included in the small cell group have the same small cell group identifier;
and carrying out unified scheduling transmission on the UE accessed to the small cell according to the cell identification.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes:
sending a system update request message to the macro base station, wherein the system update request message contains updated system parameters, so that the macro base station sends a system update message containing the updated system parameters to small cells except the small cells in the small cell group; or,
and after negotiating system parameters with the small cells except the small cells in the small cell group, sending a system update message containing the negotiated system parameters to the macro base station.
In a third aspect, a system for controlling a small cell is provided, the system comprising: a macro base station and a plurality of small base stations connected to the macro base station, wherein,
the small cell is used for reporting the small cell group identification of the small cell to the macro base station;
the macro base station is configured to generate a small cell group according to the received small cell group identifier of each small cell, where small cells included in the small cell group have the same small cell group identifier, and configure the small cell identifier for the small cells in the small cell group, so that the small cells in the small cell group perform unified scheduling transmission on UEs accessing the small cells according to the configured cell identifier.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the macro base station is specifically configured to configure the same cell identifier for the small cells in the small cell group, or configure the cell identifier for the small cells in the small cell group according to a load condition of the small cell group.
With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the small cell is further configured to report, to the macro base station, a load of a small cell of the small cell;
the macro base station is specifically configured to obtain a load of a small cell group according to a load of a small cell reported by the small base station, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group; configuring a different cell identity for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configuring the same cell identity for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold.
With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the macro base station is further configured to control each small cell in the small cell group to turn on when a load of the small cell group exceeds a second load threshold, and set a transmission power of a CRS of each small cell to a default value, where the second load threshold is smaller than the first load threshold; when the load of the small cell group does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of CRSs of the rest small cells except the at least one small cell, and informing the UE within the coverage of the small cell group of the increased transmission power of the CRS.
With reference to the third aspect, or the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, or the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the macro base station is further configured to receive a system update request message sent by the first small cell, where the system update request message includes updated system parameters, and transmitting a system update message containing the updated system parameters to small cells other than the first small cell in a small cell group in which the first small cell is located, or receiving a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell in a small cell group in which the second small cell is located, except for the second small cell.
In a fourth aspect, there is provided a base station as a macro base station connected to a plurality of small base stations, including:
a receiving unit, configured to receive a respective small cell group identifier reported by a small cell of each small base station;
a generating unit, configured to generate a small cell group according to the small cell group identifier of each small cell received by the receiving unit, where small cells included in the small cell group have the same small cell group identifier;
a control unit, configured to configure a cell identifier for the small cell in the small cell group generated by the generation unit, so that the small cell in the small cell group performs unified scheduling transmission on the UE accessing the small cell according to the configured cell identifier.
With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the control unit includes at least one of the following units:
a first control unit, configured to configure the same cell identity for the small cells in the small cell group;
a second control unit, configured to configure a cell identifier for the small cell in the small cell group according to the load condition of the small cell group.
With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the second control unit includes:
a load obtaining subunit, configured to obtain a load of the small cell group, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group;
an identifier configuring subunit, configured to configure a different cell identifier for each small cell in the small cell group when the load of the small cell group acquired by the load acquiring subunit exceeds a first load threshold, and configure the same cell identifier for each small cell in the small cell group when the load of the small cell group acquired by the load acquiring subunit does not exceed the first load threshold.
With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the second control unit further includes:
a small cell control subunit, configured to control each small cell in the small cell group to turn on when the load of the small cell group acquired by the load acquisition subunit exceeds a second load threshold, and set the transmission power of the CRS of each small cell to a default value, where the second load threshold is smaller than the first load threshold; when the load of the small cell group acquired by the load acquisition subunit does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of the CRSs of the rest small cells except the at least one small cell, and notifying the UE within the coverage of the small cell group of the increased transmission power of the CRS.
With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, or the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the base station further includes at least one of the following units:
a first updating unit, configured to receive a system update request message sent by a first small cell, where the system update request message includes updated system parameters, and send a system update message including the updated system parameters to small cells other than the first small cell in a small cell group in which the first small cell is located;
a second updating unit, configured to receive a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell in a small cell group in which the second small cell is located, except for the second small cell.
In a fifth aspect, another base station is provided, where the base station is a small base station connected to a macro base station, and the base station includes:
a reporting unit, configured to report a small cell group identifier of a small cell of the small cell to a macro base station;
a receiving unit, configured to receive a cell identifier configured by the macro base station for the small cell, where the cell identifier is a cell identifier configured by the macro base station for a small cell in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell reported by the reporting unit, and the small cells in the small cell group have the same small cell group identifier;
and the transmitting unit is used for carrying out unified scheduling transmission on the UE accessing the small cell according to the cell identifier received by the receiving unit.
With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the base station further includes at least one of the following units:
a first sending unit, configured to send a system update request message to a macro base station, where the system update request message includes updated system parameters, so that the macro base station sends a system update message including the updated system parameters to small cells other than the small cells in the small cell group;
a second sending unit, configured to send a system update message including the negotiated system parameters to the macro base station after negotiating the system parameters with the small cells other than the small cell in the small cell group.
In a sixth aspect, there is provided another base station as a macro base station connected to a plurality of small base stations, including: the transceiver is used for receiving a small cell group identifier of the small cell reported by the small cell of each small base station;
the processor is configured to generate a small cell group according to the small cell group identifier of each small cell, where small cells included in the small cell group have the same small cell group identifier, and configure a cell identifier for the small cells in the small cell group, so that the small cells in the small cell group perform unified scheduling transmission on UEs accessing the small cells according to the configured cell identifier.
With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the processor is specifically configured to configure the same cell identifier for the small cells in the small cell group, or configure the cell identifier for the small cells in the small cell group according to a load condition of the small cell group.
With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the processor is specifically configured to obtain a load of the small cell group, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group, configure a different cell identifier for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configure the same cell identifier for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold.
With reference to the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the processor is further configured to control each small cell in the small cell group to turn on when the load of the small cell group exceeds a second load threshold, and set the transmission power of the CRS of each small cell to a default value, where the second load threshold is smaller than the first load threshold; when the load of the small cell group does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of CRSs of the rest small cells except the at least one small cell, and informing the UE within the coverage of the small cell group of the increased transmission power of the CRS.
With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, or the second possible implementation manner of the sixth aspect, or the third possible implementation manner of the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the transceiver is further configured to receive a system update request message sent by the first small cell, where the system update request message includes updated system parameters, and transmitting a system update message containing the updated system parameters to small cells other than the first small cell in a small cell group in which the first small cell is located, or receiving a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell in a small cell group in which the second small cell is located, except for the second small cell.
A seventh aspect provides another base station, where the base station is a small base station connected to a macro base station, and the base station includes: the transceiver is used for reporting a small cell group identifier of a small cell to a macro base station;
the processor is configured to receive, by the transceiver, a cell identifier configured by the macro base station for the small cell, and then perform unified scheduling transmission on the UE accessing the small cell according to the cell identifier, where the cell identifier is a cell identifier configured by the macro base station for the small cell in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell, and small cells included in the small cell group have the same small cell group identifier.
With reference to the seventh aspect, in a first possible implementation manner of the seventh aspect, the processor is further configured to send, by the transceiver, a system update request message to the macro base station, where the system update request message includes updated system parameters, so that the macro base station sends, to small cells other than the small cells in the small cell group, a system update message including the updated system parameters; or after negotiating system parameters with the small cells except the small cells in the small cell group, sending a system update message containing the negotiated system parameters to the macro base station through the transceiver.
In the embodiment of the present invention, since a plurality of small cells are grouped in advance, and the small cells belonging to the same group are configured with the same small cell group identifier according to the grouping condition, after each small cell reports its own small cell group identifier to the macro base station, the macro base station can identify the small cells belonging to the same small cell group according to the small cell group identifier, and uniformly configure cell identifiers for the small cells in the same small cell group, so that the small cells in the same small cell group can perform uniform scheduling transmission on UEs accessing these small cells according to the group, and the UEs accessing these small cells can use these cells as one cell, so that the UEs can identify signals transmitted by these small cells, thereby avoiding cell identifier collision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1A is a schematic diagram of a network architecture of SCNs according to an embodiment of the present invention;
figure 1B is a flowchart of one embodiment of a method of controlling small cells of the present invention;
figure 1C is a flow chart of another embodiment of the method of controlling small cells of the present invention;
figure 2 is a flow chart of another embodiment of the method of the present invention for controlling small cells;
figure 3 is a flow chart of another embodiment of the method of the present invention for controlling small cells;
figure 4 is a block diagram of an embodiment of a system for controlling small cells in accordance with the present invention;
FIG. 5 is a block diagram of one embodiment of a base station of the present invention;
FIG. 6 is a block diagram of another embodiment of a base station of the present invention;
FIG. 7 is a block diagram of another embodiment of a base station of the present invention;
fig. 8 is a block diagram of another embodiment of a base station of the present invention.
Detailed Description
The following embodiments of the present invention provide a method, a system and a base station for controlling small cells.
In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1A, it is a schematic diagram of a network architecture of SCNs applied in the embodiment of the present invention:
fig. 1A shows a macro base station and two small base stations connected to the macro base station, which are respectively a small base station 1 and a small base station 2, where a coverage of the macro base station corresponds to a macro cell, a coverage of the small base station 1 corresponds to a small cell 1, a coverage of the small base station 2 corresponds to a small cell 2, and both the small cell 1 and the small cell 2 are within a coverage of the macro base station. It should be noted that, for convenience of example, fig. 1A only shows two small base stations within a coverage area of a macro base station, in practical application, two or more small base stations may be set within the coverage area of the macro base station as needed, that is, the number of the small base stations is not limited in the embodiment of the present invention.
Referring to fig. 1B, a flowchart of an embodiment of the method for controlling a small cell according to the present invention is shown, where the embodiment is described from the macro base station side:
step 101: and receiving the respective small cell grouping identification reported by each small cell.
In this embodiment, for a plurality of small base stations connected to a macro base station, geographically close small base stations may be grouped into one group according to geographical positions between the small base stations, small cells of the same group of small base stations belong to the same small cell group, and small cells in the same small cell group are pre-configured with a small cell group identifier that can indicate that the small cells belong to the same small cell group. When each small cell accesses the network, the small cell grouping identifier of the small cell may be reported.
The small cell group identifier may be an identifier allocated according to a small cell group, for example, if the small cell 1, the small cell 2, and the small cell 3 belong to the same small cell group, and the small cell group identifier allocated to the small cell group is "group 1", then the small cell 1, the small cell 2, and the small cell 3 report the small cell group identifier "group 1", respectively; or, the small cell group identifier may also refer to an identifier of another small cell belonging to the same small cell group as the small cell, for example, if small cell 1, small cell 2, and small cell 3 belong to the same small cell group, the identifier of small cell 1 is "device 1", the identifier of small cell 2 is "device 2", and the identifier of small cell 3 is "device 3", the small cell group identifier reported by small cell 1 includes device2 and device3, the small cell group identifier reported by small cell 2 includes device1 and device3, and the small cell group identifier reported by small cell 3 includes device1 and device 2.
Step 102: a small cell group is generated from the small cell group identity of each small cell, and the small cells included in the small cell group have the same small cell group identity.
After receiving the small cell group identifier reported by each small cell, the small cells having the same small cell group identifier may be divided into the same small cell group. Optionally, a small cell grouping list may be maintained, where the list uses the small cell grouping identifier as an index, and each entry stores one small cell grouping identifier and a small cell corresponding to the small cell grouping identifier.
Step 103: and configuring a cell identifier for the small cells in the small cell group, so that the small cells in the small cell group perform uniform scheduling transmission on the UE accessing the small cells according to the configured cell identifier.
In this embodiment, the same cell identifier may be configured for the small cells in the small cell group; or, a cell identifier may be configured for a small cell in the small cell group according to a load condition of the small cell group, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group. Where the Cell identity may also be denoted as Cell _ ID.
Optionally, when a cell identifier is configured for a small cell in the small cell group according to the load condition of the small cell group, a first load threshold and a second load threshold may be preset, where the second load threshold is smaller than the first load threshold. In this embodiment, the first load threshold is a boundary value indicating a heavy load of a small cell group, the second load threshold is a boundary value indicating a light load of the small cell group, and the first load threshold and the second load threshold may be values obtained by simulating a load of the small cell, or may also be empirical values, which is not limited in the embodiment of the present invention; when the load of the small cell group exceeds the first load threshold, the load condition of the corresponding small cell group is heavy, when the load of the small cell group is between the first load threshold and the second load threshold, the load condition of the corresponding small cell group is moderate, and when the load of the small cell group does not exceed the second load threshold, the load condition of the corresponding small cell group is light. Specifically, when the load of the small cell group exceeds a first load threshold, a different cell identity may be configured for each small cell in the small cell group, and when the load of the small cell group does not exceed the first load threshold, the same cell identity may be configured for each small cell in the small cell group. Further, when the load of the small Cell group exceeds the second load threshold, each small Cell in the small Cell group may be controlled to be turned on, and the transmission power of a Cell-specific Reference signal (CRS) of each small Cell is set as a default value; when the load of the small cell group does not exceed the second load threshold, at least one small cell in the small cell group may be controlled to turn off, the transmission power of the CRSs of the remaining small cells except the at least one small cell may be increased, and the UE within the coverage of the small cell group may be notified of the increased transmission power of the CRSs.
Referring to fig. 1C, there is a flowchart of another embodiment of the method for controlling a small cell according to the present invention, which is described from the small base station side:
step 111: and reporting the small cell grouping identification of the small cell to the macro base station.
In this embodiment, for a plurality of small base stations connected to a macro base station, geographically close small base stations may be grouped into one group according to address locations between the small base stations, small cells of the same group of small base stations belong to the same small cell group, and small cells in the same small cell group are pre-configured with a small cell group identifier that can indicate that the small cells belong to the same small cell group. When each small cell accesses the network, the small cell grouping identifier of the small cell may be reported.
Step 112: and receiving a cell identifier configured by the macro base station for the small cell, wherein the cell identifier is configured by the macro base station for the small cell in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell, and small cells contained in the small cell group have the same small cell group identifier.
In this embodiment, for the received configuration process of the cell identifier configured by the macro base station for the small cell, reference may be made to the description of the embodiment in fig. 1B, which is not described herein again.
Step 113: and carrying out unified scheduling transmission on the UE accessing the small cell according to the configured cell identification.
In this embodiment, the small cell may transmit signaling such as a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), a main System Information Block (MIB), a System Information Block (SIB) to the UE within the coverage of the small cell according to the cell identifier, and a specific transmission process is consistent with the prior art and is not described herein again.
As can be seen from the foregoing embodiments, since a plurality of small cells are grouped in advance, and the small cells belonging to the same group are configured with the same small cell group identifier according to the grouping situation, after each small cell reports its own small cell group identifier to the macro base station, the macro base station can identify the small cells belonging to the same small cell group according to the small cell group identifier, and uniformly configure cell identifiers for the small cells in the same small cell group, so that the small cells in the same small cell group can perform uniform scheduling transmission on UEs accessing these small cells according to groups, and the UEs accessing these small cells can use these small cells as one cell, so that the UEs can identify signals transmitted by these small cells, thereby avoiding cell identifier collision.
Referring to fig. 2, a flowchart of another embodiment of the method for controlling a small cell according to the present invention, which illustrates a process of a macro base station configuring the same cell identifier for the small cell through an interaction between the macro base station and a small base station:
step 201: each small cell base station maintains a small cell group identity configured for the small cell of the small cell base station.
In this embodiment, for a plurality of small base stations connected to a macro base station, geographically close small base stations may be grouped into one group according to geographical positions between the small base stations, small cells of the same group of small base stations belong to the same small cell group, and small cells in the same small cell group are pre-configured with a small cell group identifier that can indicate that the small cells belong to the same small cell group.
Step 202: when the small base station is accessed to the network, the small cell grouping identification of the small cell of the small base station is reported to the macro base station.
Step 203: and the macro base station generates a small cell group according to the small cell group identification of the small cell.
After receiving the small cell group identifier reported by each small cell, the macro base station may divide the small cells having the same small cell group identifier into the same small cell group. Optionally, a small cell grouping list may be maintained, where the list uses the small cell grouping identifier as an index, and each entry stores one small cell grouping identifier and a small cell corresponding to the small cell grouping identifier.
Step 204: and the macro base station groups the small cells and configures the same cell identification for the small cells belonging to the same small cell group.
In this embodiment, when the small cell initially accesses the network, the load of each small cell group may be light, and therefore the macro base station may configure the same cell identifier for the small cells belonging to the same small cell group, so as to reduce the collision probability of the cell identifiers.
Step 205: and the small base station performs unified scheduling transmission on the UE accessing the small cell according to the cell identifier configured for the small cell of the small base station.
In this embodiment, a small cell of a small cell may transmit signaling such as PSS, SSS, PBCH, MIB, SIB, and the like to a UE in a coverage area of the small cell according to a cell identifier, and a specific transmission process is consistent with the prior art and is not described herein again.
Step 206: and when the small cell of the small base station has the updated system parameters, sending a system updating request message containing the updated system parameters to the macro base station.
Step 207: and the macro base station transmits a system updating message containing the updated system parameters to the small cells except the small cell in the small cell group in which the small cell is positioned.
It should be noted that, in the present embodiment, the small cell may negotiate with the small cells other than the small cell in the small cell group in which the small cell is located to determine updated system parameters, and any small cell in the small cell group may send a system update message including the updated system parameters to the macro base station.
In a wireless communication system, system parameters mainly refer to parameters for configuring a small cell, for example, common system parameters may include configuration information of a Physical Random Access Channel (PRACH), cell Access restriction information, and the like, which are not described in detail herein.
As can be seen from the foregoing embodiments, since the macro base station may configure the same cell identifier for the small cells in the same small cell group based on the small cell group, the small cells in the same small cell group may perform uniform scheduling transmission on the UEs accessing these small cells, and equivalently, the UEs accessing these small cells may use these small cells as one cell, so that the UEs may identify the signals transmitted by these small cells, thereby avoiding the problem of cell identifier collision.
Referring to fig. 3, a flowchart of another embodiment of the method for controlling small cells according to the present invention, which illustrates a process of a macro base station configuring a cell identifier according to a load grouped by small cells through an interaction between the macro base station and the small base station:
step 301: each small cell base station maintains a small cell group identity configured for the small cell of the small cell base station.
In this embodiment, for a plurality of small base stations connected to a macro base station, geographically close small base stations may be grouped into one group according to address locations between the small base stations, small cells of the same group of small base stations belong to the same small cell group, and small cells in the same small cell group are pre-configured with a small cell group identifier that can indicate that the small cells belong to the same small cell group.
Step 302: when the small base station is accessed to the network, the small cell grouping identification of the small cell of the small base station is reported to the macro base station.
Step 303: and the macro base station generates a small cell group according to the small cell group identification of the small cell.
After receiving the small cell group identifier reported by each small cell, the macro base station may divide the small cells having the same small cell group identifier into the same small cell group. Optionally, a small cell grouping list may be maintained, where the list uses the small cell grouping identifier as an index, and each entry stores one small cell grouping identifier and a small cell corresponding to the small cell grouping identifier.
Step 304: the macro base station acquires the load of the small cell packet.
In this embodiment, each small cell may report the load of the small cell to the macro base station, and the macro base station takes the total load of the small cells belonging to the same small cell group as the load of the small cell group. The load of the small cell may refer to the number of users accessing the small cell, the number of active users, the user data throughput, and the like.
Step 305: and the macro base station configures cell identification for the small cells in the small cell group according to the load condition of the small cell group.
In this embodiment, a first loading threshold and a second loading threshold may be set respectively, where the second loading threshold is smaller than the first loading threshold. In this embodiment, the first load threshold is a boundary value indicating a heavy load of a small cell group, the second load threshold is a boundary value indicating a light load of the small cell group, and the first load threshold and the second load threshold may be values obtained by simulating a load of the small cell, or may also be empirical values, which is not limited in the embodiment of the present invention; when the load exceeds the first load threshold, the load condition of the corresponding small cell group is heavy, when the load is between the first load threshold and the second load threshold, the load condition of the corresponding small cell group is moderate, and when the load does not exceed the second load threshold, the load condition of the corresponding small cell group is light.
When the small cells in the small cell group initially access the network, the macro base station may configure cell identities for the small cells in the small cell group as follows:
configuring a different cell identity for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configuring the same cell identity for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold. Initially, the transmission power of the CRS of the small cells may all be set to a default value.
Step 306: judging whether the load of the small cell group changes, if so, executing step 307; otherwise, return to step 306.
Step 307: and the macro base station controls the small cells in the small cell group to adjust, and the current flow is ended.
In this embodiment, the change in the load of the small cell group means that the load of the small cell group is switched between any two load situations, i.e., heavy load, moderate load, and light load. During communication, when the load of the small cell group changes, the macro base station may control the small cells in the small cell group to adjust according to the following changes:
when the load of the small cell group is changed from heavy load to moderate load, the macro base station configures the same cell identification for the small cells in the small cell group, and keeps the transmission power of the CRS of the small cells as a default value;
when the load of the small cell group is changed from heavy load to light load, the macro base station configures the same cell identifier for the small cells in the small cell group, closes at least one small cell in the small cell group, increases the transmission power of the CRS of the rest small cells except the small cell, and notifies the adjusted transmission power of the CRS to the UE in the coverage range of the small cell group through a Physical Downlink Control Channel (PDCCH) signaling;
when the load of the small cell group is changed from moderate load to heavy load, the macro base station configures different cell identifications for the small cells in the small cell group, and keeps the transmission power of CRSs of the small cells as a default value;
when the load of the small cell group is changed from moderate to light, the macro base station closes at least one small cell in the small cell group, improves the transmission power of CRSs (cell-specific reference signals) of the rest small cells except the small cell, and informs the adjusted transmission power of the CRSs to the UE (user equipment) in the coverage range of the small cell group through PDCCH (physical downlink control channel) signaling;
when the small cell group is changed from light load to heavy load, the macro base station starts the closed small cells in the small cell group, configures different cell identifiers for the small cells in the small cell group, restores the transmission power of the CRS of the small cells in the small cell group to a default value, and notifies the adjusted transmission power of the CRS to the UE in the coverage range of the small cell group through PDCCH signaling;
when the load of the small cell group is changed from light to moderate, the macro base station starts the closed small cell in the small cell group, the transmission power of the CRS of the small cell in the small cell group is recovered to a default value, and the adjusted transmission power of the CRS is notified to the UE in the coverage range of the small cell group through PDCCH signaling.
In the above adjustment process, when the macro base station increases the transmission power of the CRS of the small cell, any of the following manners may be adopted:
one way is as follows: the macro base station controls the small cell to increase the transmitting Power of the CRS by a smaller Power step length each time, receives Reference Signal Received Power (RSRP) reported by the UE, and if the minimum value of the RSRPs of all the UE is smaller than a preset threshold value, the macro base station controls the small cell to increase the transmitting Power of the CRS by a smaller Power step length again, and counts the RSRPs reported by the UE again until the RSRPs reported by all the UE are larger than the preset threshold value, and the increase of the transmitting Power of the CRS of the small cell is stopped.
In another mode: and the macro base station receives the RSRPs reported by the UE, calculates the difference value RSRPmin-T between the minimum value RSRPmin in the RSRPs reported by all the UE and a preset threshold T, if the difference value RSRPmin-T is negative, the macro base station increases the transmitting power of the CRS of the small cell by T-RSRPmin, otherwise, the macro base station keeps the transmitting power of the existing CRS.
As can be seen from the above embodiments, since a plurality of small cells are grouped in advance, and the small cells belonging to the same group are configured with the same small cell group identifier according to the grouping condition, after each small cell reports its own small cell group identifier to the macro base station, the macro base station can identify the small cells belonging to the same small cell group according to the small cell group identifier, and uniformly configure cell identifiers for the small cells in the same small cell group; by applying the embodiment of the invention, the macro base station can configure the same cell identifier for the small cells in the same small cell group based on the small cell group, so that the small cells in the same small cell group can perform uniform scheduling transmission on the UE accessing the small cells, and equivalently, the UE accessing the small cells can take the small cells as one cell, so that the UE can identify the signals transmitted by the small cells, thereby avoiding the problem of cell identifier conflict.
Referring to fig. 4, there is a block diagram of an embodiment of the system for controlling small cells according to the present invention:
the system comprises: a macro base station 410 and a plurality of small base stations 420 connected to the macro base station 410. for convenience of illustration, only three small base stations 420 are shown in fig. 4.
The small cell 420 is configured to report a small cell group identifier of a small cell of the small cell 420 to the macro base station 410;
the macro base station 410 is configured to generate a small cell group according to the received small cell group identifier of each small cell, where small cells included in the small cell group have the same small cell group identifier, and configure a cell identifier for a small cell in the small cell group, so that the small cell in the small cell group performs unified scheduling transmission on UEs accessing the small cell according to the configured cell identifier.
Optionally, the macro base station 410 may be specifically configured to configure the same cell identifier for the small cells in the small cell group, or configure the cell identifier for the small cells in the small cell group according to the load condition of the small cell group.
Optionally, the small cell 420 may be further configured to report, to the macro base station, a load of a small cell of the small cell; the macro base station 410 may be specifically configured to obtain a load of a small cell group according to a load of a small cell reported by the small base station, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group; configuring a different cell identity for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configuring the same cell identity for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold.
Optionally, the macro base station 410 may be further configured to control each small cell in the small cell group to turn on when the load of the small cell group exceeds a second load threshold, and set the transmission power of the CRS of each small cell to a default value, where the second load threshold is smaller than the first load threshold; when the load of the small cell group does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of CRSs of the rest small cells except the at least one small cell, and informing the UE within the coverage of the small cell group of the increased transmission power of the CRS.
Optionally, the macro base station 410 may be further configured to receive a system update request message sent by a first small cell, where the system update request message includes updated system parameters, and send a system update message including the updated system parameters to a small cell other than the first small cell in a small cell group in which the first small cell is located, or receive a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell other than the second small cell in a small cell group in which the second small cell is located.
Referring to fig. 5, a block diagram of an embodiment of a base station according to the present invention is shown, where the base station is a macro base station connected to a plurality of small base stations:
the base station includes: a receiving unit 510, a generating unit 520 and a control unit 530.
Wherein, the receiving unit 510 is configured to receive a respective small cell group identifier reported by a small cell of each small cell base station;
a generating unit 520, configured to generate a small cell group according to the small cell group identifier of each small cell received by the receiving unit 510, where small cells included in the small cell group have the same small cell group identifier;
a control unit 530, configured to configure a cell identifier for the small cell in the small cell group generated by the generating unit 520, so that the small cell in the small cell group performs unified scheduling transmission on the UE accessing to the small cell according to the configured cell identifier.
Optionally, the control unit 530 may include at least one of the following units (not shown in fig. 5):
a first control unit, configured to configure the same cell identity for the small cells in the small cell group;
a second control unit, configured to configure a cell identifier for the small cell in the small cell group according to the load condition of the small cell group.
Further, the second control unit may include: a load obtaining subunit, configured to obtain a load of the small cell group, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group; an identifier configuring subunit, configured to configure a different cell identifier for each small cell in the small cell group when the load of the small cell group acquired by the load acquiring subunit exceeds a first load threshold, and configure the same cell identifier for each small cell in the small cell group when the load of the small cell group acquired by the load acquiring subunit does not exceed the first load threshold. Further, the second control unit may further include: a small cell control subunit, configured to control each small cell in the small cell group to turn on when the load of the small cell group acquired by the load acquisition subunit exceeds a second load threshold, and set the transmission power of the CRS of each small cell to a default value, where the second load threshold is smaller than the first load threshold; when the load of the small cell group acquired by the load acquisition subunit does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of the CRSs of the rest small cells except the at least one small cell, and notifying the UE within the coverage of the small cell group of the increased transmission power of the CRS.
Optionally, the base station may further include at least one of the following units (not shown in fig. 5):
a first updating unit, configured to receive a system update request message sent by a first small cell, where the system update request message includes updated system parameters, and send a system update message including the updated system parameters to small cells other than the first small cell in a small cell group in which the first small cell is located;
a second updating unit, configured to receive a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell in a small cell group in which the second small cell is located, except for the second small cell.
Referring to fig. 6, a block diagram of another embodiment of a base station of the present invention is shown, where the base station is one of a plurality of small base stations connected to a macro base station:
the base station includes: a reporting unit 610, a receiving unit 620 and a transmitting unit 630.
The reporting unit 610 is configured to report a small cell group identifier of a small cell of the small cell to the macro base station;
a receiving unit 620, configured to receive a cell identifier configured by the macro base station for the small cell, where the cell identifier is a cell identifier configured by the macro base station for a small cell in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell reported by the reporting unit 610, and the small cells in the small cell group have the same small cell group identifier;
a transmitting unit 630, configured to perform unified scheduling transmission on the UEs accessing the small cell according to the cell identifier received by the receiving unit 620.
Optionally, the base station may further include at least one of the following units (not shown in fig. 6):
a first sending unit, configured to send a system update request message to a macro base station, where the system update request message includes updated system parameters, so that the macro base station sends a system update message including the updated system parameters to small cells other than the small cells in the small cell group;
a second sending unit, configured to send a system update message including the negotiated system parameters to the macro base station after negotiating the system parameters with the small cells other than the small cell in the small cell group.
Referring to fig. 7, a block diagram of another embodiment of a base station of the present invention is shown, where the base station is a macro base station connected to a plurality of small base stations:
the base station includes: a first transceiver 710 and a first processor 720.
Wherein the first transceiver 710 is configured to receive a respective small cell group identity reported by a small cell of each small cell base station;
the first processor 720 is configured to generate a small cell group according to the small cell group identifier of each small cell, where small cells included in the small cell group have the same small cell group identifier, and configure a cell identifier for a small cell in the small cell group, so that the small cell in the small cell group performs unified scheduling transmission on UEs accessing the small cell according to the configured cell identifier.
Optionally, the first processor 720 may be specifically configured to configure the same cell identifier for the small cells in the small cell group, or configure the cell identifier for the small cells in the small cell group according to the load condition of the small cell group.
Optionally, the first processor 720 is specifically configured to obtain a load of the small cell group, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group, configure a different cell identifier for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configure the same cell identifier for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold.
Optionally, the first processor 720 may be further configured to control each small cell in the small cell group to turn on when the load of the small cell group exceeds a second load threshold, and set the transmission power of the CRS of each small cell to a default value, where the second load threshold is smaller than the first load threshold; when the load of the small cell group does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of CRSs of the rest small cells except the at least one small cell, and informing the UE within the coverage of the small cell group of the increased transmission power of the CRS.
Optionally, the first transceiver 710 may be further configured to receive a system update request message sent by a first small cell, where the system update request message includes updated system parameters, and send a system update message including the updated system parameters to small cells other than the first small cell in a small cell group in which the first small cell is located, or receive a system update message sent by a second small cell, where the system update message includes negotiated system parameters between the second small cell and small cells other than the second small cell in a small cell group in which the second small cell is located.
Referring to fig. 8, a block diagram of another embodiment of a base station of the present invention is shown, where the base station is one of a plurality of small base stations connected to a macro base station:
the base station includes: a second transceiver 810 and a second processor 820.
The second transceiver 810 is configured to report a small cell group identifier of a small cell to a macro base station;
the second processor 820 is configured to receive, through the second transceiver 810, a cell identifier configured by the macro base station for the small cell, and then perform unified scheduling transmission on the UE accessing the small cell according to the cell identifier, where the cell identifier is a cell identifier configured by the macro base station for the small cells in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell, and small cells included in the small cell group have the same small cell group identifier.
Optionally, the second processor 820 may be further configured to send a system update request message to the macro base station through the transceiver, where the system update request message includes updated system parameters, so that the macro base station sends a system update message including the updated system parameters to small cells other than the small cells in the small cell group; or after negotiating system parameters with the small cells except the small cells in the small cell group, sending a system update message containing the negotiated system parameters to the macro base station through the transceiver.
As can be seen from the foregoing embodiments, since a plurality of small cells are grouped in advance, and the small cells belonging to the same group are configured with the same small cell group identifier according to the grouping situation, after each small cell reports its own small cell group identifier to the macro base station, the macro base station can identify the small cells belonging to the same small cell group according to the small cell group identifier, and uniformly configure cell identifiers for the small cells in the same small cell group, so that the small cells in the same small cell group can perform uniform scheduling transmission on UEs accessing these small cells according to groups, and the UEs accessing these small cells can use these small cells as one cell, so that the UEs can identify signals transmitted by these small cells, thereby avoiding cell identifier collision.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A method of controlling a small cell, the method comprising:
receiving a respective small cell grouping identifier reported by each small cell;
generating a small cell group according to the small cell group identifier of each small cell, wherein the small cells contained in the small cell group have the same small cell group identifier;
configuring a cell identifier for the small cell in the small cell group, so that the small cell in the small cell group performs unified scheduling transmission on User Equipment (UE) accessing to the small cell according to the configured cell identifier.
2. The method of claim 1, wherein the configuring the cell identity for the small cell in the small cell group comprises:
configuring the same cell identification for the small cells in the small cell group; or,
configuring a cell identifier for the small cell in the small cell group according to the load condition of the small cell group.
3. The method of claim 2, wherein the configuring cell identities for small cells in the small cell group according to the load conditions of the small cell group comprises:
acquiring the load of the small cell group, wherein the load of the small cell group is the sum of the loads reported by each small cell in the small cell group;
configuring a different cell identity for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configuring the same cell identity for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold.
4. The method of claim 3, further comprising:
controlling each small cell in the small cell group to be turned on when the load of the small cell group exceeds a second load threshold, and setting the transmission power of a cell-specific reference signal (CRS) of each small cell to be a default value, wherein the second load threshold is smaller than the first load threshold;
when the load of the small cell group does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of CRSs of the rest small cells except the at least one small cell, and informing the UE within the coverage of the small cell group of the increased transmission power of the CRS.
5. The method according to any one of claims 1 to 4, wherein after configuring the cell identity for the small cells in the small cell group, the method further comprises:
receiving a system updating request message sent by a first small cell, wherein the system updating request message comprises updated system parameters;
sending a system update message containing the updated system parameters to small cells other than the first small cell in a small cell group in which the first small cell is located;
or,
receiving a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell in a small cell group in which the second small cell is located, except for the second small cell.
6. A method of controlling a small cell, the method comprising:
reporting the small cell grouping identification of the small cell to a macro base station;
receiving a cell identifier configured by the macro base station for the small cell, where the cell identifier is a cell identifier configured by the macro base station for a small cell in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell, and small cells included in the small cell group have the same small cell group identifier;
and carrying out unified scheduling transmission on the User Equipment (UE) accessed to the small cell according to the cell identification.
7. The method of claim 6, further comprising:
sending a system update request message to the macro base station, wherein the system update request message contains updated system parameters, so that the macro base station sends a system update message containing the updated system parameters to small cells except the small cells in the small cell group; or,
and after negotiating system parameters with the small cells except the small cells in the small cell group, sending a system update message containing the negotiated system parameters to the macro base station.
8. A base station as a macro base station connected to a plurality of small base stations, comprising: a transceiver and a processor, wherein,
the transceiver is used for receiving the respective small cell group identifier reported by the small cell of each small base station;
the processor is configured to generate a small cell group according to the small cell group identifier of each small cell, where small cells included in the small cell group have the same small cell group identifier, and configure a cell identifier for the small cells in the small cell group, so that the small cells in the small cell group perform unified scheduling transmission on User Equipment (UE) accessing the small cells according to the configured cell identifier.
9. The base station of claim 8,
the processor is specifically configured to configure the same cell identifier for the small cells in the small cell group, or configure the cell identifier for the small cells in the small cell group according to the load condition of the small cell group.
10. The base station of claim 9,
the processor is specifically configured to obtain a load of the small cell group, where the load of the small cell group is a sum of loads reported by each small cell in the small cell group, configure a different cell identifier for each small cell in the small cell group when the load of the small cell group exceeds a first load threshold, and configure the same cell identifier for each small cell in the small cell group when the load of the small cell group does not exceed the first load threshold.
11. The base station of claim 10,
the processor is further configured to control each small cell in the small cell group to turn on when the load of the small cell group exceeds a second load threshold, and set the transmission power of the CRS of each small cell to a default value, where the second load threshold is smaller than the first load threshold; when the load of the small cell group does not exceed the second load threshold, controlling at least one small cell in the small cell group to be turned off, increasing the transmission power of cell-specific reference signals (CRSs) of the rest small cells except the at least one small cell, and notifying the UE within the coverage of the small cell group of the increased transmission power of the CRSs.
12. According to claims 8 to 11, receiving a system update request message sent by a first small cell, where the system update request message includes updated system parameters, and sending a system update message including the updated system parameters to a small cell other than the first small cell in a small cell group in which the first small cell is located, or receiving a system update message sent by a second small cell, where the system update message includes system parameters negotiated by the second small cell and a small cell other than the second small cell in a small cell group in which the second small cell is located.
13. A base station, wherein the base station is a small base station connected to a macro base station, comprising: a transceiver and a processor, wherein,
the transceiver is used for reporting the small cell grouping identification of the small cell to the macro base station;
the processor is configured to receive, by the transceiver, a cell identifier configured by the macro base station for the small cell, and then perform unified scheduling transmission on the UE accessing the small cell according to the cell identifier, where the cell identifier is a cell identifier configured by the macro base station for the small cell in the small cell group after the macro base station generates the small cell group according to the small cell group identifier of the small cell, and small cells included in the small cell group have the same small cell group identifier.
14. The base station of claim 13,
the processor is further configured to send a system update request message to the macro base station through the transceiver, where the system update request message includes updated system parameters, so that the macro base station sends a system update message including the updated system parameters to small cells in the small cell group, except for the small cells; or after negotiating system parameters with the small cells except the small cells in the small cell group, sending a system update message containing the negotiated system parameters to the macro base station through the transceiver.
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| WO2020113359A1 (en) * | 2018-12-03 | 2020-06-11 | Qualcomm Incorporated | Managing cell selection by a wireless device |
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| US9980217B2 (en) * | 2013-11-01 | 2018-05-22 | Zte Wistron Telecom Ab | Method and system for opportunistic probing |
| WO2015135167A1 (en) * | 2014-03-13 | 2015-09-17 | Empire Technology Development Llc | Cell id allocation in heterogeneous network |
| KR102174133B1 (en) * | 2014-03-21 | 2020-11-04 | 삼성전자 주식회사 | Method and Apparatus to perform cell measurements and to choose a special cell of small cell in mobile communication system |
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Also Published As
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| CN103260151A (en) | 2013-08-21 |
| CN103260151B (en) | 2016-06-22 |
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