CN105517085B - A kind of residence reselecting and device - Google Patents
A kind of residence reselecting and device Download PDFInfo
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- CN105517085B CN105517085B CN201510934140.0A CN201510934140A CN105517085B CN 105517085 B CN105517085 B CN 105517085B CN 201510934140 A CN201510934140 A CN 201510934140A CN 105517085 B CN105517085 B CN 105517085B
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- 230000005484 gravity Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 23
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- 241000208340 Araliaceae Species 0.000 claims 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 2
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 2
- 235000008434 ginseng Nutrition 0.000 claims 2
- 238000004891 communication Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008614 cellular interaction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
Abstract
The invention discloses a kind of residence reselecting and devices, are related to field of communication technology, for so that the load of macro base station and small base station is more balanced.This method comprises: user equipment determines first community and second community；The user equipment determines that target component, the target component include the first parameter, the second parameter and basic parameter；The user equipment receives the frequency distribution factor and the power attenuation factor that the center base station is sent；The user equipment calculates the benchmark expected rate that the user equipment accesses the first expected rate of the first community, the second expected rate of the access second community and the serving cell accessed according to the target component, the frequency distribution factor and the power attenuation factor；The user equipment determines that the Target cell of gravity treatment, the Target cell are the first community or the second community according to first expected rate, second expected rate and the benchmark expected rate.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of residence reselectings and device.
Background technique
In the heterogeneous wireless network system in long term evolution (Long Term Evolution, abbreviation LTE) system, lead to
It crosses and increases one or more small base stations (also referred to as low-power wireless access node) in macro base station institute coverage cell, reach and disappear
Except the effect of the blind spot of wireless network covering, to enhance the coverage area of wireless network and the intensity of wireless signal.
However, due to increasing small base station in macrocell so that the edge customer in cell increases, and macro base station and
Small base station is using identical frequency resource, so as to cause serious inter-cell interference.Currently, when a cell can be
User equipment (User Equipment, abbreviation UE) provides most strong Reference Signal Received Power (Reference Signal
Receiving Power, abbreviation RSRP) or best Reference Signal Received Quality (Reference Signal Receiving
Quality, abbreviation RSRQ) when, user equipment accesses the cell.
But since the transmission power of macro base station and small base station differs greatly, user equipment accesses macrocell ratio
The probability for accessing low power cell (cell of small base station covering) is big, and the above method may cause small base station and can not service
User so that the load imbalance of macro base station and small base station.
Summary of the invention
The embodiment of the present invention provides a kind of residence reselecting and device, for so that macro base station and small base station it is negative
It carries more balanced.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
In a first aspect, providing a kind of residence reselecting, it is applied in heterogeneous wireless network system, the isomery wireless network
It include the serving BS of first base station, the second base station, center base station and user equipment in network system, which comprises
The user equipment determines that first community and second community, the first community are the service except the user equipment
The macrocell of the most strong Reference Signal Received Power RSRP for being supplied to the user equipment except cell, the second community are
The low power cell of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment；
The user equipment determines that target component, the target component include the first parameter, the second parameter and basic parameter,
First parameter can characterize the quality for the signal that the first base station is sent in the first community, the second parameter energy
The quality for the signal that second base station is sent in the second community is enough characterized, the basic parameter can characterize the service
The quality for the signal that base station is sent in the serving cell；
The user equipment receives the frequency distribution factor and the power attenuation factor that the center base station is sent；
The user equipment calculates institute according to the target component, the frequency distribution factor and the power attenuation factor
User equipment is stated to access the first expected rate of the first community, access the second expected rate of the second community and connect
The benchmark expected rate of the serving cell entered；
The user equipment is true according to first expected rate, second expected rate and the benchmark expected rate
Determine the Target cell of gravity treatment, the Target cell is the first community or the second community.
Second aspect provides a kind of residence reselecting, is applied in heterogeneous wireless network system, the isomery wireless network
It include center base station in network system, which comprises
The center base station calculates frequency distribution factor and the power attenuation factor；
The center base station sends the frequency distribution factor and the power attenuation factor to user equipment, for described
User equipment determines the Target cell of gravity treatment；
Wherein, the Target cell is first community or second community, and the first community is except the user equipment
The macrocell of the most strong Reference Signal Received Power RSRP for being supplied to the user equipment except serving cell, described second is small
Area is the low power cell of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment.
The third aspect provides a kind of user equipment, is applied in heterogeneous wireless network system, the heterogeneous wireless network system
It include the serving BS of first base station, the second base station, center base station and the user equipment in system, the user equipment includes:
First determination unit, for determining that first community and second community, the first community are except the user equipment
Serving cell except the most strong Reference Signal Received Power RSRP for being supplied to the user equipment macrocell, described second
Cell is the low power cell of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment；
Second determination unit, for determining that target component, the target component include the first parameter, the second parameter and benchmark
Parameter, first parameter can characterize the quality for the signal that the first base station is sent in the first community, and described second
Parameter can characterize the quality for the signal that second base station is sent in the second community, and the basic parameter can characterize institute
State the quality for the signal that serving BS is sent in the serving cell；
Receiving unit, for receiving the frequency distribution factor and the power attenuation factor that the center base station is sent；
Computing unit, for being calculated according to the target component, the frequency distribution factor and the power attenuation factor
The user equipment accesses the first expected rate of the first community, the second expected rate of the access second community and
The benchmark expected rate of the serving cell of access；
Gravity treatment unit, for according to first expected rate, second expected rate and the benchmark expected rate
Determine that the Target cell of gravity treatment, the Target cell are the first community or the second community.
Fourth aspect provides a kind of base station, is applied in heterogeneous wireless network system, in the heterogeneous wireless network system
Including the base station, the base station includes:
Computing unit, for calculating frequency distribution factor and the power attenuation factor；
Transmission unit is used for institute for sending the frequency distribution factor and the power attenuation factor to user equipment
State the Target cell that user equipment determines gravity treatment；
Wherein, the Target cell is first community or second community, and the first community is except the user equipment
The macrocell of the most strong Reference Signal Received Power RSRP for being supplied to the user equipment except serving cell, described second is small
Area is the low power cell of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment.
Method and device provided in an embodiment of the present invention, user equipment is after access service cell, by measuring RSRP
It determines and maximum first community and second community is interfered to itself, decline further according to target component and frequency distribution factor and power
Subtracting coefficient calculates the first expected rate, the second expected rate and benchmark expected rate, and according to the first expected rate, the second expectation
Rate and benchmark expected rate carry out cell reselection.In the embodiment of the present invention, the first expected rate, the second expected rate are being calculated
With the quality for not only considering the signal that base station is sent in cell during benchmark expected rate, it is also contemplated that minizone
Interfere (η), therefore so that the expected rate determined more meets the demand of user equipment, it is also possible that macro base station with
The load of small base station is more balanced.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of configuration diagram of heterogeneous wireless network system provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of residence reselecting provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of user equipment provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of base station provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Method provided in an embodiment of the present invention can be applied in heterogeneous wireless network system, it is particularly possible to apply in macro base
Stand and the application scenarios of small base station dense deployment in.
It include K (K >=1, K are integer) a macro base station and J in the heterogeneous wireless network system provided in the embodiment of the present invention
(J >=1, J are integer) a small base station, wherein each base station all can serve as the serving BS of user equipment, different macro bases
Information exchange is able to carry out between standing, each macro base station can carry out information with the small base station in the macro base station institute coverage cell
Interaction.Center base station in the embodiment of the present invention refers to the macro base station for having centralized control functions in K macro base station, or solely
The vertical base station with centralized control functions, in this case, the base station can carry out letter with each macro base station in K macro base station
Breath interaction.
Specifically, as shown in Figure 1, J=2 is to be illustrated a kind of heterogeneous wireless network system with K=2 in Fig. 1, wherein
K1And K2For two different macro base stations, J1For in K1Small base station in institute coverage cell, J2For in K2In institute coverage cell
Small base station.Ellipse in figure centered on base station refers to the base station institute coverage cell.
In embodiments of the present invention, use is dispatched in each base station in heterogeneous wireless network system in identical band system band
Family equipment, the band system band include N number of subchannel, and the frequency bandwidth of every sub-channels is identical, N1Sub-channels are interference association
Adjust channel, N2Sub-channels are interference-limited channel, N1+N2=N, N1>=1, N2>=1, N >=2, N, N1And N2It is integer.
Wherein, the user equipment that the macro base station scheduling RSRP in heterogeneous wireless network system is greater than preset threshold is assisted in interference
It adjusts on channel, scheduling RSRP is less than or equal to the user equipment of preset threshold on interference-limited channel, heterogeneous wireless network system
Small base station scheduling RSRP in system is less than or equal to the user equipment of preset threshold on interference coordination channel, and scheduling RSRP is big
In preset threshold user equipment on interference-limited channel.In this case, macrocell and low can be reduced from the angle of frequency domain
Interference between power cell.
Specifically, base station can according to the RSRP of all user equipment to report in institute coverage cell by user equipment according to
The sequence of RSRP from large to small or from small to large is ranked up, and is placed on the value conduct of the corresponding RSRP of most intermediate user equipment
Preset threshold.Preset threshold can also be a fixed value, the embodiment of the present invention to the method for determination of preset threshold without
It limits.
It include the first base station hereinafter mentioned, the second base station, center base station and service base in heterogeneous wireless network system
It stands, wherein first base station institute coverage cell includes the first community hereinafter mentioned, and the second base station institute coverage cell includes hereafter
In the second community mentioned, serving BS institute coverage cell includes the serving cell hereinafter mentioned.
The embodiment of the present invention provides a kind of residence reselecting, as shown in Figure 2, comprising:
201, user equipment determines first community and second community.
Specifically, first community is the most strong RSRP's for being supplied to user equipment in addition to the serving cell of user equipment
Macrocell, second community are that the low-power of the most strong RSRP for being supplied to user equipment in addition to the serving cell of user equipment is small
Area.
Wherein, low power cell, that is, small base station institute coverage cell, the small base station in the embodiment of the present invention can also claim
For low-power wireless access node.
It should be noted that the user equipment when selecting serving cell, can use method in the prior art.Service
Cell can be macrocell, or low power cell.
Based on example described in Fig. 1, the serving cell of user equipment can be macro base station K1Institute coverage cell, first community
It can be macro base station K2Institute coverage cell, second community can be small base station J1Institute coverage cell.
Specifically, the process that user equipment measures the RSRP that each cell provides can be found in the prior art.
202, user equipment determines that target component, target component include the first parameter, the second parameter and basic parameter.
Wherein, first parameter can characterize the quality for the signal that the first base station is sent in the first community,
Second parameter can characterize the quality for the signal that second base station is sent in the second community, the basic parameter energy
Enough characterize the quality for the signal that the serving BS is sent in the serving cell.
Specifically, first parameter is that the first base station is small described first in the first achievable mode
The signal-to-noise ratio (Signal Noise Ratio, abbreviation SNR) for the signal that area is sent (is denoted as SNR1), second parameter is described
Second base station (is denoted as SNR in the SNR for the signal that the second community is sent2), the basic parameter is that the serving BS exists
The SNR for the signal that the serving cell is sent (is denoted as SNR0), in this case, step 202 includes:
The signal that the user equipment sends the first base station in the corresponding N number of subchannel of the first community
SNR is averaged to obtain first parameter, and the user equipment is by second base station in the corresponding N number of son of the second community
The SNR of the signal sent on channel is averaged to obtain second parameter, and the user equipment is by the serving BS described
The SNR of the signal sent in the corresponding N number of subchannel of serving cell is averaged to obtain the basic parameter.
Specifically, the first parameter includes SINR in second of achievable modeIC1And SINRIL1, SINRIC1It is first
The corresponding Signal to Interference plus Noise Ratio of interference coordination frequency range (the Signal to Interference plus Noise of base station
Ratio, abbreviation SINR), SINRIL1For the corresponding SINR of interference-limited frequency range of first base station, the second parameter includes SINRIC2With
SINRIL2, SINRIC2For interference coordination the frequency range corresponding SINR, SINR of the second base stationIL2For the interference-limited frequency of the second base station
The corresponding SINR of section, basic parameter includes SINR0, SINR0The signal that serving BS is sent in serving cell is received for user equipment
SINR, in this case, step 202 includes:
User equipment by first base station first community N1The SINR of the signal sent on sub-channels is averaged to obtain
SINRIC1, by first base station first community N2The SINR of the signal sent on sub-channels is averaged to obtain SINRIL1, will
N of second base station in second community1The SINR of the signal sent on sub-channels is averaged to obtain SINRIC2, the second base station is existed
The N of second community2The SINR of the signal sent on sub-channels is averaged to obtain SINRIL2, by serving BS in serving cell pair
The SINR of the signal sent in the N number of subchannel answered is averaged to obtain SINR0。
Specifically, user equipment can calculate the son by measuring to the reference signal sent on certain sub-channels
The SNR or SINR for the signal that channel is sent.
203, center base station calculates frequency distribution factor and the power attenuation factor, and to user equipment send frequency distribution because
Son and the power attenuation factor.
Specifically, center base station may be the serving BS of user equipment, and when serving BS is center base station, user
Equipment directly can carry out information exchange with center base station, and when serving BS is not center base station, user equipment can pass through
Serving BS and center base station carry out information exchange.
Wherein, frequency distribution factor, that is, interference coordination frequency range accounts for the ratio of system bandwidth, and the power attenuation factor is interference
Coordinate the ratio of the maximum transmission power of the transmission power and base station of base station on frequency band.
Wherein, when power attenuation factor difference, the degree of inter-cell interference is different, by reducing on interference coordination frequency band
Power can reduce inter-cell interference.
Specifically, frequency distribution factorDue to N1Sub-channels are interference coordination channel, N1The frequency of sub-channels
Duan Xiangjia obtains interference coordination frequency range, and therefore, α is also equal to the ratio of interference coordination frequency range and band system band.The power attenuation factorWherein, T1For transmission power of the center base station in interference coordination frequency range, TmIt is center base station in interference-limited frequency range
(N2The frequency ranges of sub-channels is added) on transmission power, i.e. maximum transmission power, due to T1< Tm, therefore, 0 < η < 1.
It should be noted that transmission power of the base station on each interference-limited channel is equal, believe in each interference coordination
Transmission power on road is equal, also, transmission power of the base station on interference-limited channel is the maximum transmission power of the base station.
Optionally, center base station can send frequency distribution factor and the power attenuation factor, Mei Gehong to each macro base station
Base station can each small base station into institute coverage cell send the frequency distribution factor and the power attenuation factor.It is each macro
Base station and each small base station are after getting the frequency distribution factor and the power attenuation factor, according to the frequency distribution factor
Transmission power is adjusted with the power attenuation factor.
It should be noted that step 203 need to execute before the step 204, with holding for step 201 and step 202
Row sequence is in no particular order.
204, user equipment receives the frequency distribution factor and the power attenuation factor that center base station is sent.
205, user equipment calculates user equipment access the according to target component, frequency distribution factor and the power attenuation factor
The benchmark of first expected rate of one cell, the second expected rate for accessing second community and the serving cell accessed it is expected speed
Rate.
Specifically, the description based on step 202, in the first achievable mode,
First expected rate:
Second expected rate:
Benchmark expected rate: E0=log2(1+SNR0)。
Specifically, the description based on step 202, in second of achievable mode,
First expected rate: E1=(1- α) log2(1+SINRIL1)+αlog2(1+SINRIC1),
Second expected rate: E2=(1- α) log2(1+SINRIL2)+αlog2(1+SINRIC2),
Benchmark expected rate: E0=log2(1+SINR0)。
206, user equipment determines the target of gravity treatment according to the first expected rate, the second expected rate and benchmark expected rate
Cell.
Specifically, Target cell is first community or second community.
Optionally, step 206 specifically includes: when second expected rate is greater than benchmark expected rate and described first
When expected rate is less than second expected rate, the user equipment selects the second community small as the target of gravity treatment
Area；Alternatively, being greater than or equal to described the when first expected rate is greater than benchmark expected rate and first expected rate
When two expected rates, the user equipment selects the first community as the Target cell of gravity treatment.
Specifically, E2> E1And E2> E0When, the desired value that user equipment accesses second community is higher than access first community
With the desired value of serving cell, therefore, user equipment selects Target cell of the second community as gravity treatment；Work as E1> E2And E1>
E0When, the desired value that user equipment accesses first community is higher than the desired value of access second community and serving cell, therefore, user
Equipment selects Target cell of the first community as gravity treatment.In the case of other, user equipment is without cell reselection.
Optionally, after step 206, this method further include:
207, user equipment sends cell re-selection request to center base station.
It can be with specifically, cell re-selection request is used to request access Target cell to center base station, in cell re-selection request
Cell ID including Target cell determines Target cell for center base station.
208, center base station receives the cell re-selection request that user equipment is sent, and is determined and used according to the cell re-selection request
The Target cell of family equipment selection.
209, center base station determines whether user equipment but shifting to Target cell according to the loading condition of Target cell.
Specifically, center base station when determining whether user equipment reselecting to Target cell, needs to consider Target cell
Present load, avoid Target cell access user equipment it is excessive, influence the communication quality of the user equipment in Target cell.
Specifically, if the current of base station belonging to Target cell (cell that i.e. base station is covered includes Target cell) is born
When load is less than preset threshold, center base station allows user equipment to reselect to Target cell, and center base station is by the base station and user
The information of equipment is updated；If the present load of base station belonging to Target cell is more than preset threshold, center base station does not permit
Perhaps user equipment reselects to Target cell.
Specifically, the process that user equipment reselects to Target cell can be found in existing re-selection procedure.
Method provided in an embodiment of the present invention, user equipment pass through determining pair of measurement RSRP after access service cell
Itself interferes maximum first community and second community, further according to target component and frequency distribution factor and the power attenuation factor
Calculate the first expected rate, the second expected rate and benchmark expected rate, and according to the first expected rate, the second expected rate and
Benchmark expected rate carries out cell reselection.In the embodiment of the present invention, the first expected rate, the second expected rate and benchmark are being calculated
Not only consider the quality for the signal that base station is sent in cell during expected rate, it is also contemplated that inter-cell interference
(η), therefore so that the expected rate determined more meets the demand of user equipment, it is also possible that macro base station with it is small-sized
The load of base station is more balanced.
The embodiment of the present invention also provides a kind of user equipment 30, for executing the above method, is applied to heterogeneous wireless network
It include first base station, the second base station, center base station and the user equipment 30 in the heterogeneous wireless network system in system
Serving BS, as shown in figure 3, the user equipment 30 includes:
First determination unit 301, for determining that first community and second community, the first community are except the user sets
The macrocell of the most strong Reference Signal Received Power RSRP for being supplied to the user equipment except standby serving cell, described
Two cells are that the low-power of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment is small
Area；
Second determination unit 302, for determining target component, the target component include the first parameter, the second parameter and
Basic parameter, first parameter can characterize the quality for the signal that the first base station is sent in the first community, described
Second parameter can characterize the quality for the signal that second base station is sent in the second community, and the basic parameter being capable of table
Levy the quality for the signal that the serving BS is sent in the serving cell；
Receiving unit 303, for receiving the frequency distribution factor and the power attenuation factor that the center base station is sent；
Computing unit 304, based on according to the target component, the frequency distribution factor and the power attenuation factor
Calculate the user equipment access the first expected rate of the first community, the access second community the second expected rate and
The benchmark expected rate of the serving cell accessed；
Gravity treatment unit 305, for it is expected speed according to first expected rate, second expected rate and the benchmark
Rate determines that the Target cell of gravity treatment, the Target cell are the first community or the second community.
Optionally, each base station in the heterogeneous wireless network system is dispatched user in identical band system band and is set
Standby, the band system band includes N number of subchannel, and the frequency bandwidth of every sub-channels is identical, N1Sub-channels are interference coordination letter
Road, N2Sub-channels are interference-limited channel；
Wherein, the macro base station scheduling RSRP in the heterogeneous wireless network system is greater than the user equipment of preset threshold dry
Disturb coordinate channel on, scheduling RSRP be less than or equal to preset threshold user equipment on interference-limited channel, the isomery without
The user equipment that small base station scheduling RSRP in line network system is less than or equal to preset threshold is adjusted on interference coordination channel
It spends RSRP and is greater than the user equipment of preset threshold on interference-limited channel, first base station institute coverage cell includes described the
One cell, the second base station institute coverage cell includes the second community, and the serving BS institute coverage cell includes described
Serving cell, N1+N2=N, N1>=1, N2>=1, N >=2, N, N1And N2It is integer.
Optionally, first parameter is the Signal to Noise Ratio (SNR) for the signal that the first base station is sent in the first community,
Second parameter is the SNR for the signal that second base station is sent in the second community, and the basic parameter is the clothes
The SNR for the signal that business base station is sent in the serving cell, second determination unit 302 are specifically used for:
The SNR for the signal that the first base station is sent in the corresponding N number of subchannel of the first community is averaged
To first parameter, the SNR for the signal that second base station is sent in the corresponding N number of subchannel of the second community is taken
Second parameter is averagely obtained, the signal that the serving BS is sent in the corresponding N number of subchannel of the serving cell
SNR be averaged to obtain the basic parameter.
Optionally, the gravity treatment unit 305, is specifically used for:
When second expected rate is greater than benchmark expected rate and first expected rate is less than second expectation
When rate, the user equipment selects the second community as the Target cell of gravity treatment；Alternatively,
It is greater than or equal to described the when first expected rate is greater than benchmark expected rate and first expected rate
When two expected rates, the user equipment selects the first community as the Target cell of gravity treatment.
User equipment provided in an embodiment of the present invention is determined by measurement RSRP to itself after access service cell
Maximum first community and second community are interfered, is calculated further according to target component and frequency distribution factor and the power attenuation factor
First expected rate, the second expected rate and benchmark expected rate, and according to the first expected rate, the second expected rate and benchmark
Expected rate carries out cell reselection.In the embodiment of the present invention, the first expected rate, the second expected rate and benchmark expectation are being calculated
The quality for the signal that base station is sent in cell is not only considered during rate, it is also contemplated that inter-cell interference (η), because
This, is so that the expected rate determined more meets the demand of user equipment, it is also possible that macro base station and small base station
It loads more balanced.
The embodiment of the present invention also provides a kind of base station 40, for executing the above method, is applied to heterogeneous wireless network system
In, it include the base station 40 in the heterogeneous wireless network system, as shown in figure 4, the base station 40 includes:
Computing unit 401, for calculating frequency distribution factor and the power attenuation factor；
Transmission unit 402 is used for for sending the frequency distribution factor and the power attenuation factor to user equipment
The user equipment determines the Target cell of gravity treatment；
Wherein, the Target cell is first community or second community, and the first community is except the user equipment
The macrocell of the most strong Reference Signal Received Power RSRP for being supplied to the user equipment except serving cell, described second is small
Area is the low power cell of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment.
It optionally, further include first base station, the second base station and serving BS in the heterogeneous wireless network system, it is described different
Each base station in structure Radio Network System scheduling user's set, the band system band in identical band system band include N number of
The frequency bandwidth of subchannel, every sub-channels is identical, N1Sub-channels are interference coordination channel, N2Sub-channels are interference-limited
Channel；
Wherein, the macro base station scheduling RSRP in the heterogeneous wireless network system is greater than the user equipment of preset threshold dry
Disturb coordinate channel on, scheduling RSRP be less than or equal to preset threshold user equipment on interference-limited channel, the isomery without
The user equipment that small base station scheduling RSRP in line network system is less than or equal to preset threshold is adjusted on interference coordination channel
It spends RSRP and is greater than the user equipment of preset threshold on interference-limited channel, first base station institute coverage cell includes described the
One cell, the second base station institute coverage cell includes the second community, and the serving BS institute coverage cell includes described
Serving cell, N1+N2=N, N1>=1, N2>=1, N >=2, N, N1And N2It is integer.
Optionally,α is frequency distribution factor；η is the power attenuation factor, T1Exist for the base station
Transmission power on interference coordination channel, TmFor transmission power of the base station on interference-limited channel.
Base station provided in an embodiment of the present invention, by sending frequency distribution factor and the power attenuation factor to user equipment,
So that user equipment is in access service cell and after determining and interfering maximum first community and second community to itself, it being capable of basis
Target component and frequency distribution factor and the power attenuation factor calculate the first expected rate, the second expected rate and benchmark expectation
Rate, and cell reselection is carried out according to the first expected rate, the second expected rate and benchmark expected rate.The embodiment of the present invention
In, base station, which is not only considered, during calculating the first expected rate, the second expected rate and benchmark expected rate exists
The quality for the signal that cell is sent, it is also contemplated that inter-cell interference (η), therefore, so that the expected rate determined more accords with
The demand for closing user equipment, it is also possible that the load of macro base station and small base station is more balanced.
It is apparent to those skilled in the art that for convenience and simplicity of description, only with above-mentioned each function
The division progress of module can according to need and for example, in practical application by above-mentioned function distribution by different function moulds
Block is completed, i.e., the internal structure of device is divided into different functional modules, to complete all or part of function described above
Energy.The device of foregoing description and the specific work process of module, can refer to corresponding processes in the foregoing method embodiment, herein
It repeats no more.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the module, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple module or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or unit
Letter connection.
It, can also be in addition, can integrate in a processing module in each functional module in each embodiment of the application
It is that modules physically exist alone, can also be integrated in two or more modules in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (13)
1. a kind of residence reselecting, which is characterized in that be applied in heterogeneous wireless network system, the heterogeneous wireless network system
It include the serving BS of first base station, the second base station, center base station and user equipment in system, which comprises
The user equipment determines that first community and second community, the first community are the serving cell except the user equipment
Except the most strong Reference Signal Received Power RSRP for being supplied to the user equipment macrocell, the second community is except institute
State the low power cell of the most strong RSRP for being supplied to the user equipment except the serving cell of user equipment；
The user equipment determines target component, and the target component includes the first parameter, the second parameter and basic parameter, described
First parameter can characterize the quality for the signal that the first base station is sent in the first community, and second parameter being capable of table
The quality for the signal that second base station is sent in the second community is levied, the basic parameter can characterize the serving BS
In the quality for the signal that the serving cell is sent；
The user equipment receives the frequency distribution factor and the power attenuation factor that the center base station is sent；
The user equipment calculates the use according to the target component, the frequency distribution factor and the power attenuation factor
Family equipment access the first expected rate of the first community, the access second community the second expected rate and accessed
The benchmark expected rate of the serving cell；
The user equipment determines weight according to first expected rate, second expected rate and the benchmark expected rate
The Target cell of choosing, the Target cell are the first community or the second community.
2. the method according to claim 1, wherein each base station in the heterogeneous wireless network system is in phase
Scheduling user's set in same band system band, the band system band includes N number of subchannel, the frequency bandwidth phase of every sub-channels
Together, N1Sub-channels are interference coordination channel, N2Sub-channels are interference-limited channel；
Wherein, the user equipment that the macro base station scheduling RSRP in the heterogeneous wireless network system is greater than preset threshold is assisted in interference
It adjusts on channel, scheduling RSRP is less than or equal to the user equipment of preset threshold on interference-limited channel, the isomery wireless network
Small base station scheduling RSRP in network system is less than or equal to the user equipment of preset threshold on interference coordination channel, scheduling
RSRP is greater than the user equipment of preset threshold on interference-limited channel, and first base station institute coverage cell includes described first
Cell, the second base station institute coverage cell includes the second community, and serving BS institute coverage cell includes the clothes
Business cell, N1+N2=N, N1>=1, N2>=1, N >=2, N, N1And N2It is integer.
3. according to the method described in claim 2, it is characterized in that, first parameter is the first base station described first
The Signal to Noise Ratio (SNR) for the signal that cell is sent, second parameter are the signal that second base station is sent in the second community
SNR, the basic parameter is the SNR of signal that the serving BS is sent in the serving cell, and the user equipment is true
Set the goal parameter, comprising:
The SNR for the signal that the user equipment sends the first base station in the corresponding N number of subchannel of the first community
It is averaged to obtain first parameter, the user equipment is by second base station in the corresponding N number of sub- letter of the second community
The SNR of the signal sent on road is averaged to obtain second parameter, and the user equipment is by the serving BS in the clothes
The SNR of the signal sent in the corresponding N number of subchannel of business cell is averaged to obtain the basic parameter.
4. method according to claim 1-3, which is characterized in that the user equipment is according to first expectation
Rate, second expected rate and the benchmark expected rate determine the Target cell of gravity treatment, comprising:
When second expected rate is greater than benchmark expected rate and first expected rate is less than second expected rate
When, the user equipment selects the second community as the Target cell of gravity treatment；Alternatively,
When first expected rate is greater than benchmark expected rate and first expected rate is greater than or equal to the second phase
When hoping rate, the user equipment selects the first community as the Target cell of gravity treatment.
5. the method according to claim 1, wherein the method also includes:
The center base station calculates frequency distribution factor and the power attenuation factor；
The center base station sends the frequency distribution factor and the power attenuation factor to user equipment, is used for the user
Equipment determines the Target cell of gravity treatment.
6. according to the method described in claim 2, it is characterized in that,α is frequency distribution factor；η is function
Rate decay factor, T1For transmission power of the center base station on interference coordination channel, TmIt is center base station on interference-limited channel
Transmission power.
7. a kind of user equipment, which is characterized in that be applied in heterogeneous wireless network system, in the heterogeneous wireless network system
Including first base station, the second base station, center base station and the user equipment serving BS, the user equipment includes:
First determination unit, for determining that first community and second community, the first community are the clothes except the user equipment
The macrocell of the most strong Reference Signal Received Power RSRP for being supplied to the user equipment except cell of being engaged in, the second community
For the low power cell of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment；
Second determination unit, for determining that target component, the target component include the first parameter, the second parameter and benchmark ginseng
Number, first parameter can characterize the quality for the signal that the first base station is sent in the first community, second ginseng
Number can characterize the quality for the signal that second base station is sent in the second community, and the basic parameter can characterize described
The quality for the signal that serving BS is sent in the serving cell；
Receiving unit, for receiving the frequency distribution factor and the power attenuation factor that the center base station is sent；
Computing unit, for according to the calculating of the target component, the frequency distribution factor and the power attenuation factor
User equipment accesses the first expected rate of the first community, accesses the second expected rate of the second community and accessed
The serving cell benchmark expected rate；
Gravity treatment unit, for being determined according to first expected rate, second expected rate and the benchmark expected rate
The Target cell of gravity treatment, the Target cell are the first community or the second community.
8. user equipment according to claim 7, which is characterized in that each base station in the heterogeneous wireless network system
The scheduling user's set in identical band system band, the band system band include N number of subchannel, the frequency bandwidth of every sub-channels
It is identical, N1Sub-channels are interference coordination channel, N2Sub-channels are interference-limited channel；
Wherein, the user equipment that the macro base station scheduling RSRP in the heterogeneous wireless network system is greater than preset threshold is assisted in interference
It adjusts on channel, scheduling RSRP is less than or equal to the user equipment of preset threshold on interference-limited channel, the isomery wireless network
Small base station scheduling RSRP in network system is less than or equal to the user equipment of preset threshold on interference coordination channel, scheduling
RSRP is greater than the user equipment of preset threshold on interference-limited channel, and first base station institute coverage cell includes described first
Cell, the second base station institute coverage cell includes the second community, and serving BS institute coverage cell includes the clothes
Business cell, N1+N2=N, N1>=1, N2>=1, N >=2, N, N1And N2It is integer.
9. user equipment according to claim 8, which is characterized in that first parameter is the first base station described
The Signal to Noise Ratio (SNR) for the signal that first community is sent, second parameter are what second base station was sent in the second community
The SNR of signal, the basic parameter are the SNR for the signal that the serving BS is sent in the serving cell, and described second really
Order member, is specifically used for:
It is averaged the SNR for the signal that the first base station is sent in the corresponding N number of subchannel of the first community to obtain institute
The first parameter is stated, the SNR for the signal that second base station is sent in the corresponding N number of subchannel of the second community is averaged
Second parameter is obtained, the SNR for the signal that the serving BS is sent in the corresponding N number of subchannel of the serving cell
It is averaged to obtain the basic parameter.
10. according to the described in any item user equipmenies of claim 7-9, which is characterized in that the gravity treatment unit is specifically used for:
When second expected rate is greater than benchmark expected rate and first expected rate is less than second expected rate
When, the user equipment selects the second community as the Target cell of gravity treatment；Alternatively,
When first expected rate is greater than benchmark expected rate and first expected rate is greater than or equal to the second phase
When hoping rate, the user equipment selects the first community as the Target cell of gravity treatment.
11. a kind of heterogeneous wireless network system, which is characterized in that including as described in claim 7-10 is any user equipment and
Base station；Wherein, the base station includes:
Computing unit, for calculating frequency distribution factor and the power attenuation factor；
Transmission unit is used for the use for sending the frequency distribution factor and the power attenuation factor to user equipment
Family equipment determines the Target cell of gravity treatment；
Wherein, the Target cell is first community or second community, and the first community is the service except the user equipment
The macrocell of the most strong Reference Signal Received Power RSRP for being supplied to the user equipment except cell, the second community are
The low power cell of the most strong RSRP for being supplied to the user equipment in addition to the serving cell of the user equipment.
12. heterogeneous wireless network system according to claim 11, which is characterized in that in the heterogeneous wireless network system
It further include first base station, the second base station and serving BS, each base station in the heterogeneous wireless network system is in identical system
Scheduling user's set on system frequency band, the band system band includes N number of subchannel, and the frequency bandwidth of every sub-channels is identical, N1It is a
Subchannel is interference coordination channel, N2Sub-channels are interference-limited channel；
Wherein, the user equipment that the macro base station scheduling RSRP in the heterogeneous wireless network system is greater than preset threshold is assisted in interference
It adjusts on channel, scheduling RSRP is less than or equal to the user equipment of preset threshold on interference-limited channel, the isomery wireless network
Small base station scheduling RSRP in network system is less than or equal to the user equipment of preset threshold on interference coordination channel, scheduling
RSRP is greater than the user equipment of preset threshold on interference-limited channel, and first base station institute coverage cell includes described first
Cell, the second base station institute coverage cell includes the second community, and serving BS institute coverage cell includes the clothes
Business cell, N1+N2=N, N1>=1, N2>=1, N >=2, N, N1And N2It is integer.
13. heterogeneous wireless network system according to claim 12, which is characterized in thatα be frequency distribute because
Son；η is the power attenuation factor, T1For transmission power of the base station on interference coordination channel, TmFor the base station
Transmission power on interference-limited channel.
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| MX2019015122A (en) | 2017-06-16 | 2020-02-05 | Ericsson Telefon Ab L M | Ue context handling in a disaggregated radio access node. |
| CN109257777B (en) * | 2017-07-14 | 2021-01-15 | ***通信有限公司研究院 | Switching method, first base station, terminal and computer readable storage medium |
| CN114339952B (en) * | 2020-09-29 | 2023-07-25 | 紫光展锐(重庆)科技有限公司 | Multimode terminal communication method and communication device |
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