CN105307243A - Wireless access network as well as method and device for selecting service small cell of wireless access network - Google Patents
Wireless access network as well as method and device for selecting service small cell of wireless access network Download PDFInfo
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- CN105307243A CN105307243A CN201410351468.5A CN201410351468A CN105307243A CN 105307243 A CN105307243 A CN 105307243A CN 201410351468 A CN201410351468 A CN 201410351468A CN 105307243 A CN105307243 A CN 105307243A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
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Abstract
The invention discloses a wireless access network as well as a method and device for selecting a service small cell of the wireless access network. The wireless access network comprises a base station, wherein the base station administers at least one macro cell, a plurality of small cells are administered in the coverage range of the macro cell, each of the small cells is controlled by the base station to provide a service to at most one terminal and each terminal is controlled by the base station to access at most one small cell. By means of the invention, in a high-density small cell deployment region, one small cell accepts at most one terminal, and no more than one small cell provides a service to each terminal; therefore, terminal interference in the small cell can be avoided and interference between small cells can be suppressed.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of wireless access network and system of selection and the device of serving small-cell.
Background technology
In mobile communication, in the deployment region of high density small-cell, each small-cell coverage, less than hundred meters, even may only have the scope of several meters.The number of small-cell becomes rapidly many, may reach up to a hundred.Each terminal entering region almost can listen to the signal of all small-cells in this high-density deployment region.Terminal number in the deployment region of high density small-cell is almost constant, but available data throughout then reaches the increase of hundreds of times.Such structure, form with legacy network, conventional cell absorbs the pattern of traffic carrying capacity, is different greatly.
First, small-cell number Pang is many, and this community and adjacent cells down transmitting power bring the interference source number of terminal also to roll up thereupon.Disturb between traditional calculation plot, under such change, become the calculation of super large Matrix Formula, to the computing chip ability of terminal and base station and speed challenge huge, correspond to the significant increase of cost, power consumption, increase processing delay simultaneously.
Secondly, the covering scale of small-cell diminishes greatly.In the thinking of conventional cell, a community holds multiple terminal, can keep certain distance between terminal.And in same small-cell, the spacing of terminal is too near, between terminal, interference can reach the degree that each terminal normally cannot carry out business mutually.
Again, in the general coverage of tradition or compared with in the community of large coverage, devise the measuring amount of various complicated air interface Physics layer and physical channel, this describes or symbolize the reception of each terminal under different location, different distance, friction speed, the wireless environment of transmission accurately.And in the deployment region of high density small-cell, the coverage of small-cell is very little, the impact that landform, geography cause is less, terminal is low speed or fixed user, the situations such as wireless channel decline, reflection relatively easily can realize precognition or detect, and wireless channel change also can be less.
In sum, in the deployment region of high density small-cell, how base station controls the problem that small-cell is Terminal for service, does not have effective solution at present.
Summary of the invention
For in the deployment region of high density small-cell, how base station controls the problem that small-cell is Terminal for service, the invention provides system of selection and the device of a kind of wireless access network and service small-cell thereof, at least to solve the problem.
According to an aspect of the present invention, provide a kind of wireless access network, comprise: base station, wherein, this base station has at least one macrocell under its command, in this macrocell coverage area, have multiple small-cell under its command, each small-cell in above-mentioned multiple small-cell is controlled to be to a multidirectional Terminal for service by above-mentioned base station, and each terminal is controlled to be to multiple access small-cell by above-mentioned base station.
Alternatively, above-mentioned base station, for determining that each is current not as the channel gain sum of the small-cell, adjacent area of the small-cell of Serving cell; Select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, above-mentioned service small-cell is for providing the small-cell of service to above-mentioned terminal to be accessed.
Alternatively, above-mentioned base station, measures and the channel gain reported for receiving the also terminal of memory resident in each service small-cell.
Alternatively, above-mentioned base station, for when small-cell not as service small-cell time, arrange not as service small-cell small-cell in channel gain be invalid.
Alternatively, small-cell, above-mentioned adjacent area is the small-cell, adjacent area as service small-cell.
Alternatively, above-mentioned channel gain is the channel gain of the pilot channel of small-cell.
Alternatively, above-mentioned base station, for when determining to select service small-cell for above-mentioned terminal to be accessed, is set to seizure condition by the small-cell of correspondence; Initialization and after terminal leaves small-cell, is set to idle condition by small-cell.
Alternatively, above-mentioned base station, for when not existing for above-mentioned terminal to be accessed and providing the small-cell of service, refuses above-mentioned terminal to be accessed access small-cell.
According to another aspect of the present invention, provide the system of selection of serving small-cell in a kind of wireless access network, above-mentioned wireless access network comprises: base station, wherein, above-mentioned base station has at least one macrocell under its command, multiple small-cell is had under its command in above-mentioned macrocell coverage area, each small-cell in above-mentioned multiple small-cell is controlled to be to a multidirectional Terminal for service by above-mentioned base station, each terminal is controlled to be that said method comprises: determine that each is current not as the channel gain sum of the adjacent area of the small-cell of Serving cell to multiple access small-cell by above-mentioned base station; Select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, above-mentioned service small-cell is for providing the small-cell of service to above-mentioned terminal to be accessed.
Alternatively, said method also comprises: when determining to select service small-cell for above-mentioned terminal to be accessed, the small-cell of correspondence is set to seizure condition.
Alternatively, said method also comprises: when not existing for above-mentioned terminal to be accessed and providing the small-cell of service, refuses above-mentioned terminal to be accessed access small-cell.
Alternatively, said method also comprises: receive the also terminal of memory resident in each service small-cell and measure and the channel gain reported.
Alternatively, said method also comprises: after small-cell is left in initialization or terminal, and the small-cell of correspondence is set to idle condition.
Alternatively, above-mentioned channel gain is the channel gain of the pilot channel of small-cell.
Alternatively, small-cell, above-mentioned adjacent area is the small-cell, adjacent area as service small-cell.
According to a further aspect of the invention, provide the system of selection of serving small-cell in a kind of wireless access network, above-mentioned wireless access network comprises: base station, wherein, above-mentioned base station has at least one macrocell under its command, in above-mentioned macrocell coverage area, have multiple small-cell under its command, and each small-cell in above-mentioned multiple small-cell is controlled to be to a multidirectional Terminal for service by above-mentioned base station, each terminal is controlled to be that said method comprises to multiple access small-cell by above-mentioned base station:
Steps A, the gain of initialization channels of neighboring areas and comparison value are 0db, and initialization current selection service small-cell result is nothing, and from all small-cells, selects a small-cell as current small-cell according to predefined procedure, performs step B;
Step B, judges whether above-mentioned current small-cell is idle condition, when above-mentioned current small-cell is idle condition, performs step C; When above-mentioned current small-cell is not for idle condition, perform step e;
Step C, obtains the channel gain of small-cell as service small-cell in the small-cell, adjacent area of above-mentioned current small-cell, determines above-mentioned channel gain sum, obtain current neighbor channel gain and, perform step D;
Step D, more above-mentioned current neighbor channel gain and the size with channels of neighboring areas gain and comparison value, when above-mentioned current neighbor channel gain with when being less than or equal to above-mentioned channels of neighboring areas gain and comparison value, with by above-mentioned current neighbor channel gain with replace above-mentioned channels of neighboring areas gain and comparison value; Above-mentioned current selection service small-cell result is set for having, current selection service small-cell is set to above-mentioned current small-cell; Perform step e;
Step e, according to above-mentioned predefined procedure using the next small-cell of above-mentioned current area as above-mentioned current small-cell, perform step B, until traveled through all small-cells, perform step F;
Step F, if above-mentioned current selection service small-cell result is for having, obtains above-mentioned front selection and serving small-cell, using the service small-cell of the above-mentioned current small-cell selecting service small-cell to record as terminal to be accessed.
Alternatively, above-mentioned steps F also comprises: if above-mentioned current selection service small-cell result is nothing, refuse above-mentioned terminal to be accessed access small-cell.
Alternatively, from all small-cells, a small-cell is selected to comprise as current small-cell according to predefined procedure in above-mentioned steps A: according to the above-mentioned current small-cell of numbering selective sequential from small to large or from big to small of above-mentioned small-cell.
Alternatively, the channel gain as the small-cell of service small-cell in the small-cell, adjacent area of above-mentioned current small-cell is obtained in above-mentioned steps C, comprise: whether the channel gain judging the small-cell, adjacent area of above-mentioned current small-cell is effective, wherein, when small-cell, above-mentioned adjacent area is as service small-cell, be set to effectively by the channel gain of small-cell, above-mentioned adjacent area, when small-cell, above-mentioned adjacent area is not as service small-cell, it is invalid to be set to by the channel gain of small-cell, above-mentioned adjacent area; When the channel gain of the small-cell, adjacent area of above-mentioned current small-cell is effective, obtain the channel gain of small-cell, above-mentioned adjacent area.
Alternatively, in above-mentioned steps C, when small-cell, above-mentioned adjacent area is idle condition, determine that above-mentioned channel gain sum is 0db.
Alternatively, above-mentioned channel gain is the channel gain of the pilot channel of small-cell.
Alternatively, the slight small-cell for determining according to small-cell numbering size order of the next one of above-mentioned current area.
Alternatively, when terminal leaves above-mentioned service small-cell, above-mentioned service small-cell state is set to idle condition.
Alternatively, receiving terminal channel gain of reporting behind access small-cell.
According to a further aspect of the invention, provide the choice device of serving small-cell in a kind of wireless access network, above-mentioned wireless access network comprises: base station, wherein, above-mentioned base station has at least one macrocell under its command, multiple small-cell is had under its command in above-mentioned macrocell coverage area, each small-cell in above-mentioned multiple small-cell is controlled to be to a multidirectional Terminal for service by above-mentioned base station, each terminal is controlled to be to multiple access small-cell by above-mentioned base station, said apparatus comprises: determination module, for determining that each is current not as the channel gain sum of the adjacent area of the small-cell of Serving cell, select module, for selecting the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, above-mentioned service small-cell is for providing the small-cell of service to above-mentioned terminal to be accessed.
Alternatively, said apparatus also comprises: arrange module, for when determining to select service small-cell for above-mentioned terminal to be accessed, the small-cell of correspondence is set to seizure condition; After small-cell is left in initialization or terminal, the small-cell of correspondence is set to idle condition; And/or refusal module, for when not existing for above-mentioned terminal to be accessed and providing the small-cell of service, refuses above-mentioned terminal to be accessed access small-cell.
Alternatively, said apparatus also comprises: memory module, measures and the channel gain reported for receiving the also terminal of memory resident in each service small-cell.
Alternatively, above-mentioned channel gain is the channel gain of the pilot channel of small-cell.
Alternatively, small-cell, above-mentioned adjacent area is the small-cell, adjacent area as service small-cell.
By the present invention, in high density small-cell deployment region, a terminal is received at most in a small-cell, and each terminal is provided service by a small-cell at most, terminal in small-cell can be avoided mutually to disturb, and can suppress the interference between small-cell.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the wireless access network according to the embodiment of the present invention;
Fig. 2 is the flow chart of the system of selection of serving small-cell in the wireless access network according to the embodiment of the present invention;
Fig. 3 is the flow chart according to serving the system of selection of small-cell in the optional wireless access network of the embodiment of the present invention;
Fig. 4 is the flow chart of the system of selection of service small-cell according to the embodiment of the present invention;
Fig. 5 is the flow chart of the channel yield value of renewal terminal to report according to the embodiment of the present invention;
Fig. 6 is the flow chart of the renewal small-cell state according to the embodiment of the present invention; And
Fig. 7 is the structured flowchart of the choice device of serving small-cell in the wireless access network according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Fig. 1 is the schematic diagram of the wireless access network according to the embodiment of the present invention, as shown in Figure 1, the wireless access network of the embodiment of the present invention, comprise: base station 1, wherein, this base station 1 has at least one macrocell under its command, in this macrocell coverage area, have multiple small-cell under its command, each small-cell in above-mentioned multiple small-cell is controlled as to a multidirectional Terminal for service by above-mentioned base station 1, and each terminal is controlled as to multiple access small-cell by above-mentioned base station 1.
By the embodiment of the present invention, in high density small-cell deployment region, a terminal is received at most in a small-cell, and each terminal is provided service by a small-cell at most, terminal in small-cell can be avoided mutually to disturb, and can suppress the interference between small-cell.
Terminal is linked in small-cell, and by small-cell for it provides service, in embodiments of the present invention, the small-cell for Terminal for service is called service small-cell.In order to select service small-cell for terminal, in an execution mode of the embodiment of the present invention, above-mentioned base station, can also be used for determining that each is current not as the channel gain sum of the small-cell, adjacent area of the small-cell of Serving cell; Select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, above-mentioned service small-cell is for providing the small-cell of service to above-mentioned terminal to be accessed.In embodiments of the present invention, each small-cell can comprise small-cell, one or more adjacent area, namely adjacent with small-cell small-cell.The small-cell, adjacent area of small-cell can be disposed in advance and determine, but is not limited thereto.
By this execution mode, for high density small-cell deployment region feature, the interference of original super large Matrix Formula calculation is estimated, has been simplified to the computing of channel gain sum, greatly reduce computational complexity, reduce operation time, reduce the computing cost of base station and the measurement cost of terminal.
Alternatively, above-mentioned base station, can also be used for when not existing for above-mentioned terminal to be accessed and providing the small-cell of service, refuses above-mentioned terminal to be accessed access small-cell.
In embodiments of the present invention, when accessing terminal to be accessed, select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, consider that the overall interference brought in the deployment region of whole high density small-cell is minimum, consider based on overall condition, avoid the better performances of a community, the problem that scarce meeting causes whole region performance to decline.
In order to determine the channel gain sum of the small-cell, adjacent area of small-cell, base station can obtain the channel yield value of small-cell, adjacent area in several ways, in an execution mode of the embodiment of the present invention, above-mentioned base station may be used for receiving and the terminal of memory resident in each service small-cell is measured and the channel gain reported.In embodiments of the present invention, terminal according to preset strategy, or under the control of base station, can report its channel gain to base station.The channel gain of this terminal to report stored before, after receiving the channel gain of terminal to report, can be deleted, preserve the current channel gain reported of terminal by base station.
In an execution mode of the embodiment of the present invention, above-mentioned base station may be used for when small-cell not as service small-cell time, arrange not as service small-cell small-cell in channel gain be invalid.The small-cell, adjacent area of small-cell is the small-cell, adjacent area as service small-cell, when determining the channel gain sum of small-cell, adjacent area of small-cell, determines the channel gain sum as the small-cell, adjacent area of service small-cell in small-cell, adjacent area.
In an Alternate embodiments of the embodiment of the present invention, above-mentioned channel gain can be the channel gain of the pilot channel of small-cell.By this preferred implementation, for high density small-cell deployment region feature, wireless channel environment is stablized, and change is slow and few, adopt small-cell pilot channel as the benchmark measuring channel gain, the wireless signal situation of whole small-cell can be reflected in a simpler way.
Alternatively, above-mentioned base station, for when determining to select service small-cell for above-mentioned terminal to be accessed, is set to seizure condition by the small-cell of correspondence.The state of small-cell, in initialization and after terminal leaves small-cell, can be set to idle condition by base station.
The embodiment of the present invention additionally provides the system of selection of serving small-cell in a kind of wireless access network, and the method can be applied in above-mentioned wireless access network.Below the system of selection of the service small-cell of the embodiment of the present invention is described.
Fig. 2 is the flow chart of the system of selection of serving small-cell in the wireless access network according to the embodiment of the present invention, and as shown in Figure 2, the method comprising the steps of S202 is to step S204.
Step S202, determines that each is current not as the channel gain sum of the adjacent area of the small-cell of Serving cell.
Step S204, select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, above-mentioned service small-cell is for providing the small-cell of service to above-mentioned terminal to be accessed.
Pass through the embodiment of the present invention, for high density small-cell deployment region feature, the interference of original super large Matrix Formula calculation is estimated, has been simplified to the computing of channel gain sum, greatly reduce computational complexity, reduce operation time, reduce the computing cost of base station and the measurement cost of terminal.
In embodiments of the present invention, when accessing terminal to be accessed, select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, consider that the overall interference brought in the deployment region of whole high density small-cell is minimum, consider based on overall condition, avoid the better performances of a community, the problem that scarce meeting causes whole region performance to decline.
Alternatively, said method also comprises: when determining to select service small-cell for above-mentioned terminal to be accessed, the small-cell of correspondence is set to seizure condition.Alternatively, said method also comprises: after small-cell is left in initialization or terminal, and the small-cell of correspondence is set to idle condition.
Alternatively, when not existing for above-mentioned terminal to be accessed and providing the small-cell of service, refuse above-mentioned terminal to be accessed access small-cell.
In order to determine the channel gain sum of the small-cell, adjacent area of small-cell, the channel yield value of small-cell, adjacent area can be obtained in several ways, in an execution mode of the embodiment of the present invention, the also terminal of memory resident in each service small-cell can be received and measure and the channel gain reported.
Alternatively, above-mentioned channel gain is the channel gain of the pilot channel of small-cell.By this preferred implementation, for high density small-cell deployment region feature, wireless channel environment is stablized, and change is slow and few, adopt small-cell pilot channel as the benchmark measuring channel gain, the wireless signal situation of whole small-cell can be reflected in a simpler way.
In an execution mode of the embodiment of the present invention, above-mentioned base station may be used for when small-cell not as service small-cell time, arrange not as service small-cell small-cell in channel gain be invalid.The small-cell, adjacent area of small-cell is the small-cell, adjacent area as service small-cell, when determining the channel gain sum of small-cell, adjacent area of small-cell, determines the channel gain sum as the small-cell, adjacent area of service small-cell in small-cell, adjacent area.
The embodiment of the present invention additionally provides the system of selection of serving small-cell in a kind of optional wireless access network, and the method can be applied in wireless access network as shown in Figure 1.Below this embodiment is described.
Fig. 3 is the flow chart according to serving the system of selection of small-cell in the optional wireless access network of the embodiment of the present invention, and as shown in Figure 3, the method comprising the steps of S302 is to step S312.
Step S302, the gain of initialization channels of neighboring areas and comparison value are 0db, and initialization current selection service small-cell result is nothing, and from all small-cells, selects a small-cell as current small-cell according to predefined procedure, performs step S304.
Step S304, judges whether above-mentioned current small-cell is idle condition, when above-mentioned current small-cell is idle condition, performs step S306; When above-mentioned current small-cell is not for idle condition, perform step S310.
Step S306, obtains the channel gain of small-cell as service small-cell in the small-cell, adjacent area of above-mentioned current small-cell, determines above-mentioned channel gain sum, obtain current neighbor channel gain and, perform step S308.
Step S308, more above-mentioned current neighbor channel gain and the size with channels of neighboring areas gain and comparison value, when above-mentioned current neighbor channel gain with when being less than or equal to above-mentioned channels of neighboring areas gain and comparison value, with by above-mentioned current neighbor channel gain with replace above-mentioned channels of neighboring areas gain and comparison value; Above-mentioned current selection service small-cell result is set for having, current selection service small-cell is set to above-mentioned current small-cell; Perform step S310.
Step S310, according to above-mentioned predefined procedure using the next small-cell of above-mentioned current area as above-mentioned current small-cell, perform step S304, until traveled through all small-cells, perform step S312.
Step S312, if above-mentioned current selection service small-cell result is for having, obtains above-mentioned front selection and serving small-cell, using the service small-cell of the above-mentioned current small-cell selecting service small-cell to record as terminal to be accessed.
Alternatively, above-mentioned steps S312 also comprises: if above-mentioned current selection service small-cell result is nothing, refuse above-mentioned terminal to be accessed access small-cell.
In embodiments of the present invention, can arrange numbering in advance for each small-cell, this numbering can be continuous print integer, such as, for N number of small-cell, small-cell can be numbered the continuous integral number of 1 to N.In an execution mode of the embodiment of the present invention, according to the above-mentioned current small-cell of the numbering of above-mentioned small-cell selective sequential from small to large or from big to small, but can be not limited thereto in above-mentioned steps S302.
In an execution mode of the embodiment of the present invention, above-mentioned base station may be used for when small-cell not as service small-cell time, arrange not as service small-cell small-cell in channel gain be invalid.The small-cell, adjacent area of small-cell is the small-cell, adjacent area as service small-cell, when determining the channel gain sum of small-cell, adjacent area of small-cell, determines the channel gain sum as the small-cell, adjacent area of service small-cell in small-cell, adjacent area.
Alternatively, in above-mentioned steps S310, the next small-cell of current area is the small-cell determined according to small-cell numbering size order.When numbering order from small to large according to small-cell, next small-cell is the small-cell that numbering increases.When according to small-cell order from big to small, next small-cell is the small-cell that numbering reduces.
The channel gain as the small-cell of service small-cell in the small-cell, adjacent area of above-mentioned current small-cell is obtained in above-mentioned steps S306, comprise: whether the channel gain judging the small-cell, adjacent area of above-mentioned current small-cell is effective, wherein, when small-cell, above-mentioned adjacent area is as service small-cell, the channel gain of small-cell, above-mentioned adjacent area is set to effectively, when small-cell, above-mentioned adjacent area is not as service small-cell, it is invalid to be set to by the channel gain of small-cell, above-mentioned adjacent area; When the channel gain of the small-cell, adjacent area of above-mentioned current small-cell is effective, obtain the channel gain of small-cell, above-mentioned adjacent area.
Alternatively, in above-mentioned steps S306, when small-cell, above-mentioned adjacent area is idle condition, directly can determines that above-mentioned channel gain sum is 0db, preferably, can not channel gain be obtained.
Alternatively, above-mentioned channel gain is the channel gain of the pilot channel of small-cell.
Alternatively, when terminal leaves above-mentioned service small-cell, above-mentioned service small-cell state is set to idle condition.
In order to determine the channel gain sum of the small-cell, adjacent area of small-cell, the channel yield value of small-cell, adjacent area can be obtained in several ways, in an execution mode of the embodiment of the present invention, the also terminal of memory resident in each service small-cell can be received and measure and the channel gain reported.
Below an Alternate embodiments of the embodiment of the present invention is described.
In embodiments of the present invention, in this high-density region, deploy 1 macrocell and C small-cell (C>0).Each small-cell is designated " c small-cell " or " small-cell c " (c is integer, value from 1, until C).Have U fast mobile terminal successively to this high-density region, each terminal iidentification is " u terminal " or " terminal u " (u is integer, value from 1, until U).Manage the base station of these small-cells, for terminal u selects certain small-cell in this high-density region in this C small-cell, be used as the service small-cell of this terminal u.
Base station pre-defines seizure condition array SmallCellState[c small-cell, small-cell]=idle or take.Further, this array is all initialized as SmallCellState[c small-cell]=idle (c is integer, value from 1, until C).By this array of base station maintenance.
Be previously defined in terminal to report channel gain array Gain[c small-cell in c small-cell] channel yield value (unit db) of the pilot channel of terminal to report in=invalid or c small-cell.Further, this array is all initialized as Gain[c small-cell]=invalid.The value reported by base station record UE, writes and safeguards this array.
The small-cell list that closes on of pre-defined definition c small-cell is Neighbor[c small-cell]=close on small-cell 1, close on small-cell 2 ..., close on small-cell n, close on small-cell N (c) }.N (c) is the number of closing on small-cell of c small-cell, and N (c) is integer, 0<N (c) <C.N represents that small-cell is closed in n-th in the small-cell of closing on of c small-cell, and n is integer, value from 1, until maximum N (c).Manage the base station of these small-cells, according to the concrete condition of network design, to originally closing on small-cell list and N (c) carries out initialization assignment.When more than representing invalid, use a very high values, as 10000000, represent.
Manage the base station of these small-cells, for terminal u selects certain small-cell in this high-density region in this C small-cell, come the service small-cell as this terminal u.Every u terminal and base station perform following process.
Fig. 4 is the flow chart of the system of selection of service small-cell according to the embodiment of the present invention, and as shown in Figure 4, the method comprising the steps of S110 is to step S310.
Step S110: the u terminal access macrocell, sends the request of application service small-cell to base station.
Step S120: base station receives the request of this terminal.Base station initialization " faces district's channel gain summation comparison value "=0db.
Step S130: base station record " current selection service small-cell result "=nothing.
Step S140: base station arranges c=1.
Step S150: base station judges, if SmallCellState[c small-cell]=take, then forward step S260 to; Otherwise, forward step S160 to.
Step S160: Base station initialization " faces district's channel gain summation "=0db.
Step S170: base station obtains Neighbor[" current selection service small-cell "]=close on small-cell 1, close on small-cell 2 ..., close on small-cell n ..., close on small-cell N (c) } and information.N (c) is the number of closing on small-cell of c small-cell, and N (c) is integer, 0<N (c) <C.N represents that small-cell is closed in n-th in the small-cell of closing on of c small-cell, and n is integer, value from 1, until maximum N (c).
Step S180: base station arranges n=1.
Step S190: base station judges: if Gain[closes on small-cell n]=invalid, then go to step S210; Otherwise, go to step S200.
Step S200: base station arranges " facing district's channel gain summation "=" facing district's channel gain summation "+Gain[and closes on small-cell n].
Step S210: base station arranges n=n+1.
Step S220: base station judges: if n>N (c), so proceed to step S230; Otherwise, proceed to step S190.
Step S230: base station judges: if " facing district's channel gain summation " < " faces district's channel gain summation comparison value " so proceed to step S240; Otherwise, proceed to step S260.
Step S240: base station arranges " facing district's channel gain summation comparison value "=" facing district's channel gain summation ".
Step S250: base station is arranged " current selection service small-cell result "=have.Base station setting " current selection service small-cell "=c small-cell.
Step S260: base station arranges c=c+1.
Step S270: base station judges: if c>C, then go to step S280; Otherwise, go to step S150.
Step S280: base station judges, if " current selection service small-cell result "=have, then go to step S290; Otherwise, go to step S310.
Step S290: base station arranges SmallCellState[" current selection service small-cell "]=take.
Step S300: base station notifies u terminal, for it applies for a successfully service small-cell, service small-cell has been " current selection service small-cell ".
Step S310: base station notifies u terminal cannot be its application one service small-cell.
Fig. 5 is the flow chart of the channel yield value of renewal terminal to report according to the embodiment of the present invention, and as shown in Figure 5, each terminal (being designated as u terminal) and base station perform with step S510 to step S550.
Step S510: a u terminal sends the request of application service small-cell to base station.
Step S520: base station receives the request of this terminal u.Base station notifies this terminal u, and for it applies for a successfully service small-cell, service small-cell is " small-cell c ".
The channel gain of the pilot channel of step S530: terminal u measurement small-cell c, unit db, and measured value is reported base station.
Step S540: after base station receives the measured value of terminal u, upgrades Gain[small-cell c] measured value (db) that reports of=terminal u.
Step S550: if terminal u leaves this service small-cell c, then interrupt and terminate present treatment process.Otherwise, go to step S530 and be cycled to repeat and carry out present treatment process.
When terminal leaves this service small-cell, the seizure condition of small-cell is updated to the free time, Fig. 6 is the flow chart of the renewal small-cell state according to the embodiment of the present invention, and as shown in Figure 6, each terminal (being designated as u terminal) and base station perform step S610 to step S650.
Step S610: a u terminal sends the request of application service small-cell to base station.Base station receives the request of this terminal u.
Step S620: a successfully service small-cell is applied in base station for this reason terminal u, and service small-cell is " small-cell c ".Base station arranges SmallCellState[small-cell c]=take.
Step S630: base station notifies this terminal u, for it applies for a successfully service small-cell, service small-cell has been " small-cell c ".
Step S640: terminal u determines to leave its service small-cell c, will leave event notice to base station.
Step S650: base station receives the event notice that terminal u leaves its service small-cell c, and base station upgrades SmallCellState[small-cell c]=idle.
By this Alternate embodiments, the rule of a terminal can only be received at most in a small-cell, and each terminal is provided at most the rule of service by a small-cell.
First, in high density small-cell deployment region feature, a terminal can only be received at most in a small-cell, each terminal is provided service by a small-cell at most, engineering construction mode so targetedly, can avoid terminal in community mutually to disturb, and can suppress the interference of minizone.
Secondly, for high density small-cell deployment region feature, the interference of original super large Matrix Formula calculation is estimated, has been simplified to the computing of channel gain sum, greatly reduce computational complexity, reduce operation time, reduce the computing cost of base station and the measurement cost of terminal.
Again, for high density small-cell deployment region feature, wireless channel environment is stablized, and change is slow and few, adopts small-cell pilot channel as the benchmark measuring channel gain, can reflect the wireless signal situation of whole small-cell in a simpler way.
Finally, when receiving new user, consider that the overall interference brought in the deployment region of whole high density small-cell is minimum, consider based on overall condition.The better performances of a community can not be brought, the problem that scarce meeting causes whole region performance to decline.
The embodiment of the present invention additionally provides the choice device of serving small-cell in a kind of wireless access network, can realize the said method of the embodiment of the present invention.Below the choice device of the service small-cell of the embodiment of the present invention is described.
Fig. 7 is the structured flowchart of the choice device of serving small-cell in the wireless access network according to the embodiment of the present invention, and as shown in Figure 7, this device comprises: determination module 10, for determining that each is current not as the channel gain sum of the adjacent area of the small-cell of Serving cell; Select module 20, for selecting the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, above-mentioned service small-cell is for providing the small-cell of service to above-mentioned terminal to be accessed.
Alternatively, said apparatus can also comprise: arrange module, for when determining to select service small-cell for above-mentioned terminal to be accessed, the small-cell of correspondence is set to seizure condition; After small-cell is left in initialization or terminal, the small-cell of correspondence is set to idle condition; And/or refusal module, for when not existing for above-mentioned terminal to be accessed and providing the small-cell of service, refuses above-mentioned terminal to be accessed access small-cell.
Alternatively, said apparatus can also comprise: memory module, measures and the channel gain reported for receiving the also terminal of memory resident in each service small-cell.Alternatively, above-mentioned channel gain is the channel gain of the pilot channel of small-cell.Alternatively, small-cell, above-mentioned adjacent area is the small-cell, adjacent area as service small-cell.
It should be noted that, for the part corresponding with said method and wireless access network, see the foregoing description of the embodiment of the present invention, can not repeat them here.
From above description, can find out, present invention achieves following technique effect: in high density small-cell deployment region, a terminal is received at most in a small-cell, each terminal is provided service by a small-cell at most, terminal in small-cell can be avoided mutually to disturb, and the interference between small-cell can be suppressed.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (29)
1. a wireless access network, it is characterized in that, comprise: base station, wherein, described base station has at least one macrocell under its command, in described macrocell coverage area, have multiple small-cell under its command, each small-cell in described multiple small-cell is controlled to be to a multidirectional Terminal for service by described base station, and each terminal is controlled to be to multiple access small-cell by described base station.
2. wireless access network according to claim 1, is characterized in that, described base station, for
Determine that each is current not as the channel gain sum of the small-cell, adjacent area of the small-cell of Serving cell;
Select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, described service small-cell is for providing the small-cell of service to described terminal to be accessed.
3. wireless access network according to claim 2, is characterized in that, described base station, measures and the channel gain reported for receiving the also terminal of memory resident in each service small-cell.
4. the wireless access network according to Claims 2 or 3, is characterized in that, described base station, for when small-cell not as service small-cell time, arrange not as service small-cell small-cell in channel gain be invalid.
5. wireless access network according to claim 2, is characterized in that, small-cell, described adjacent area is the small-cell, adjacent area as service small-cell.
6. the wireless access network according to Claims 2 or 3, is characterized in that, described channel gain is the channel gain of the pilot channel of small-cell.
7. the wireless access network according to any one of claim 2 to 6, is characterized in that, described base station, for when determining to select service small-cell for described terminal to be accessed, the small-cell of correspondence is set to seizure condition; Initialization and after terminal leaves small-cell, is set to idle condition by small-cell.
8. the wireless access network according to any one of claim 2 to 6, is characterized in that, described base station, for when not existing for described terminal to be accessed and providing the small-cell of service, refuses described terminal to be accessed access small-cell.
9. in a wireless access network, serve the system of selection of small-cell, it is characterized in that, described wireless access network comprises: base station, wherein, described base station has at least one macrocell under its command, in described macrocell coverage area, have multiple small-cell under its command, and each small-cell in described multiple small-cell is controlled to be to a multidirectional Terminal for service by described base station, each terminal is controlled to be that described method comprises to multiple access small-cell by described base station:
Determine that each is current not as the channel gain sum of the adjacent area of the small-cell of Serving cell;
Select the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, described service small-cell is for providing the small-cell of service to described terminal to be accessed.
10. method according to claim 9, is characterized in that, also comprises:
When determining to select service small-cell for described terminal to be accessed, the small-cell of correspondence is set to seizure condition.
11. methods according to claim 9 or 10, is characterized in that, also comprise:
When not existing for described terminal to be accessed and providing the small-cell of service, refuse described terminal to be accessed access small-cell.
12. methods according to claim 9, is characterized in that, also comprise:
Receive the also terminal of memory resident in each service small-cell to measure and the channel gain reported.
13. methods according to claim 9 or 10, is characterized in that, also comprise: after small-cell is left in initialization or terminal, the small-cell of correspondence is set to idle condition.
14. methods according to claim 7, is characterized in that, described channel gain is the channel gain of the pilot channel of small-cell.
15. methods according to claim 7, is characterized in that, small-cell, described adjacent area is the small-cell, adjacent area as service small-cell.
The system of selection of small-cell is served in 16. 1 kinds of wireless access networks, it is characterized in that, described wireless access network comprises: base station, wherein, described base station has at least one macrocell under its command, in described macrocell coverage area, have multiple small-cell under its command, and each small-cell in described multiple small-cell is controlled to be to a multidirectional Terminal for service by described base station, each terminal is controlled to be that described method comprises to multiple access small-cell by described base station:
Steps A, the gain of initialization channels of neighboring areas and comparison value are 0db, and initialization current selection service small-cell result is nothing, and from all small-cells, selects a small-cell as current small-cell according to predefined procedure, performs step B;
Step B, judges whether described current small-cell is idle condition, when described current small-cell is idle condition, performs step C; When described current small-cell is not for idle condition, perform step e;
Step C, obtains the channel gain of small-cell as service small-cell in the small-cell, adjacent area of described current small-cell, determines described channel gain sum, obtain current neighbor channel gain and, perform step D;
Step D, more described current neighbor channel gain and the size with channels of neighboring areas gain and comparison value, when described current neighbor channel gain with when being less than or equal to described channels of neighboring areas gain and comparison value, with by described current neighbor channel gain with replace described channels of neighboring areas gain and comparison value; Described current selection service small-cell result is set for having, current selection service small-cell is set to described current small-cell; Perform step e;
Step e, according to described predefined procedure using the next small-cell of described current area as described current small-cell, perform step B, until traveled through all small-cells, perform step F;
Step F, if described current selection service small-cell result is for having, obtains described front selection and serving small-cell, using the service small-cell of the described current small-cell selecting service small-cell to record as terminal to be accessed.
17. methods according to claim 16, is characterized in that, described step F also comprises: if described current selection service small-cell result is nothing, refuse described terminal to be accessed access small-cell.
18. methods according to claim 16, it is characterized in that, in described steps A, from all small-cells, select a small-cell to comprise as current small-cell according to predefined procedure: according to described small-cell numbering selective sequential from small to large or from big to small described in current small-cell.
19. methods according to claim 16, is characterized in that, obtain the channel gain as the small-cell of service small-cell in the small-cell, adjacent area of described current small-cell, comprising in described step C:
Whether the channel gain judging the small-cell, adjacent area of described current small-cell is effective, wherein, when small-cell, described adjacent area is as service small-cell, the channel gain of small-cell, described adjacent area is set to effectively, when small-cell, described adjacent area is not as service small-cell, it is invalid to be set to by the channel gain of small-cell, described adjacent area;
When the channel gain of the small-cell, adjacent area of described current small-cell is effective, obtain the channel gain of small-cell, described adjacent area.
20. methods according to claim 16, is characterized in that, in described step C, when small-cell, described adjacent area is idle condition, determine that described channel gain sum is 0db.
21. methods according to claim 16, is characterized in that, described channel gain is the channel gain of the pilot channel of small-cell.
22. methods according to claim 16, is characterized in that, the next small-cell of described current area is the small-cell determined according to small-cell numbering size order.
23. methods according to claim 16, is characterized in that, when terminal leaves described service small-cell, described service small-cell state are set to idle condition.
24. methods according to claim 16, is characterized in that, also comprise: the channel gain that receiving terminal reports behind access small-cell.
The choice device of small-cell is served in 25. 1 kinds of wireless access networks, it is characterized in that, described wireless access network comprises: base station, wherein, described base station has at least one macrocell under its command, in described macrocell coverage area, have multiple small-cell under its command, and each small-cell in described multiple small-cell is controlled to be to a multidirectional Terminal for service by described base station, each terminal is controlled to be that described device comprises to multiple access small-cell by described base station:
Determination module, for determining that each is current not as the channel gain sum of the adjacent area of the small-cell of Serving cell;
Select module, for selecting the channel gain of adjacent area and minimum small-cell as the service small-cell of terminal to be accessed, wherein, described service small-cell is for providing the small-cell of service to described terminal to be accessed.
26. devices according to claim 25, is characterized in that, also comprise:
Module being set, for when determining to select service small-cell for described terminal to be accessed, the small-cell of correspondence being set to seizure condition; After small-cell is left in initialization or terminal, the small-cell of correspondence is set to idle condition; And/or
Refusal module, for when not existing for described terminal to be accessed and providing the small-cell of service, refuses described terminal to be accessed access small-cell.
27. devices according to claim 25, is characterized in that, also comprise:
Memory module, measures and the channel gain reported for receiving the also terminal of memory resident in each service small-cell.
28. devices according to any one of claim 25 to 27, it is characterized in that, described channel gain is the channel gain of the pilot channel of small-cell.
29. devices according to any one of claim 25 to 27, is characterized in that, small-cell, described adjacent area is the small-cell, adjacent area as service small-cell.
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| CN201410351468.5A CN105307243A (en) | 2014-07-22 | 2014-07-22 | Wireless access network as well as method and device for selecting service small cell of wireless access network |
| PCT/CN2014/086063 WO2015117299A1 (en) | 2014-07-22 | 2014-09-05 | Method and apparatus for selecting wireless access network and serving small cell thereof |
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| CN102547910A (en) * | 2012-02-09 | 2012-07-04 | 中国联合网络通信集团有限公司 | Method for selecting wireless access point and wireless access point |
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| CN103118396A (en) * | 2013-01-23 | 2013-05-22 | 华为技术有限公司 | Method for managing small community networks and base station |
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| KR101382825B1 (en) * | 2008-04-25 | 2014-04-08 | 한국전자통신연구원 | Basestation device and terminal device |
| CN102781115B (en) * | 2012-08-03 | 2014-10-29 | 西安电子科技大学 | Automatic channel selection method based on channel order in dense wireless fidelity (WiFi) |
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| CN102625356A (en) * | 2011-02-01 | 2012-08-01 | 中兴通讯股份有限公司 | CoMP-based method for accessing multiple cells by terminal and system |
| WO2012173347A2 (en) * | 2011-06-14 | 2012-12-20 | 주식회사 케이티 | Method for controlling small cell access and small cell base station |
| CN102547910A (en) * | 2012-02-09 | 2012-07-04 | 中国联合网络通信集团有限公司 | Method for selecting wireless access point and wireless access point |
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