CN104640149B - A kind of adaptive cell extension biasing method of adjustment being used in heterogeneous network - Google Patents
A kind of adaptive cell extension biasing method of adjustment being used in heterogeneous network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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Abstract
The invention discloses a kind of adaptive cell extension biasing method of adjustment being used in TD LTE A heterogeneous networks, including：User in Microcell is divided into CRE user and central user, the user in macrocell is divided into boundary user and central user；Cell bias is adjusted according to the load balance situation between macrocell and Microcell, if macrocell heavier loads, if macrocell is selected and Microcell is accessed in boundary user can obtain user than accessing current home macrocell higher SINR successively, cell biasing is updated to active user and cuts cell bias needed for the preselected Microcell；If micro-cell load is heavier, if Microcell select successively in CRE user access macrocell can obtain than access current home Microcell higher SINR user, cell biasing is updated to active user and cuts cell bias needed for the preselected macrocell, load between macrocell and Microcell is balanced by iteration adjustment cell bias, is finally reached the target of dynamic community adjusting biasing.
Description
Technical field
The present invention relates to a kind of adaptive cell extension biasing method of adjustment being used in TD-LTE-A heterogeneous networks, belong to
Mobile communication technology field.
Background technology
In order to lift the overall performance of network, it is conceived to the spectrum efficiency for improving per unit region, heterogeneous network is by TD-
LTE-A standardization bodies are proposed, have become one of key technology considered in TD-LTE-A standard formulations.Heterogeneous network by
Some using different radio access technologies base node form, they have the function of different capacity, constraints and.
In TD-LTE-A systems, distal end radio node (RRH) and some low power nodes can be newly added under classical macro-cellular covering, such as
Including Pico cell, Home eNodeB and relaying.The deployment of new node can effectively mitigate macrocellular load, improve specific region
Covering quality, improve edge customer performance.
The introducing of heterogeneous network be faced with self-organizing, self-optimizing, backhaul design, switching, inter-cell interference etc. some
Allowed important technical challenges, wherein due to network topology structure change and bring problem of inter-cell interference it is particularly important that.In macrocellular
Under microcellulor scene, the terminal user in grand (macro) cell edge can cause larger uplink to micro- (pico) cell
Interference.Range expansion technique (Range Expansion) can solve the problems, such as this, but there are some defects：On the one hand, when
When bias biases are too small, insufficient load from macro station to base station can be caused to shift；On the other hand, if bias biases too
Greatly, the SINR of PUE may can not meet the decoding minimum threshold of downlink physical control channel (PDCCH).It is for this reason, it may be necessary to a kind of
Effective method, the shortcomings that to overcome range above expansion technique, ensures load transfer of the macro station to base station, while reduce small
The downlink interference that area edge terminal user is subject to, improves the total capacity of system.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention proposes a kind of adaptive cell biasing
Method of adjustment, the cell biasing of optimization can be automatically selected in this method, so that the cell side in heterogeneous network is effectively improved
On the basis of the handling capacity of edge user, reach the load balancing in macrocell and small section.
Technical solution：A kind of adaptive cell extension biasing method of adjustment being used in TD-LTE-A heterogeneous networks, initially
After changing cell biasing, the cycle performs following steps：
The first step：The related parameter of signal receiving quality based on reporting of user, the user in each Microcell is divided into micro-
Cell extension range areas (Cell range expansion, CRE) user and central user, and, by each macrocell
User is divided into macrocell boundary user and central user；
Second step：The user that can cut into its interior Microcell j is selected in the boundary user of macrocell i, and phase is calculated
The cell bias answered, by user and corresponding bias composition setBeing selected in the CRE user of Microcell j to cut
Enter the user of macrocell i, and corresponding cell bias is calculated, by user and corresponding bias composition setWherein, i ∈ ΩMacro, j ∈ ΛMacro,i, ΩMacroFor all macro base station set, Λ in networkMacro,iFor macro base station
Micro-base station set in i coverages；
3rd step：The resources occupation rate of each macrocell and each Microcell is calculated, and calculates the money of Microcell j in macrocell i
The ratio ω of source occupancy and the resources occupation rate of macrocell ii,j；
4th step：According to ωi,jThe cell bias of value adjustment Microcell j, if ωi,jWithin the scope of default, i.e.,
ωi,j∈[ω0,ω1], then terminate the cell biasing adjustment of Microcell j；If ωi,jLess than default range lower limit, i.e. ωi,j＜
ω0, then into the 5th step；If ωi,jMore than default range limit, i.e. ωi,j＞ ω1, then into the 6th step；Wherein, [ω0,
ω1] it is the threshold zone for representing macrocell and the non-load balanced case in small section that operator is set according to network condition
Between.
5th step：According toThe order of bias from small to large in set takes out still untreated user successively,
After judging that active user k switches Microcell j, if required business demand can be met in cell, Microcell j's
Biasing is adjusted toBias needed for the active user k incisions Microcell j of middle storage, user is according to inclined after adjustment
Put value and carry out reselecting and accessing for serving cell, and return to the 3rd step；If the cell for terminating Microcell j it is impossible to meet if
Biasing adjustment；
6th step：According toThe order of bias from small to large in set takes out still untreated use successively
Family, it is small if required business demand can be met in macrocell after judging that active user k switches macrocell
The cell biasing of area j is adjusted toBias needed for the active user k incisions macrocell i of middle storage, user according to
Bias after adjustment carries out reselecting and accessing for serving cell, and returns to the 3rd step, micro- if terminating it is impossible to meet if
The cell biasing adjustment of cell j.
Further, the user in each Microcell is divided into Microcell CRE user and central user in the first step
In specific steps, including：
What all reporting of user measurements in Microcell obtained receives from the reference signal of macro base station and current home micro-base station
Power (Reference Signal Receiving Power, RSRP)；
Microcell base station after the RSRP measurement results for belonging to all users in the cell are received, according to
Divide and dispatch the user in its cell, by Microcell CRE user (CRE-UE) scheduling in ABS (almost blank
Frame) on, by Microcell central user (Center-UE) scheduling on non-ABS；Wherein,It is received micro- for base station
The most strong Reference Signal Received Power of interference from all macro base stations in community user reported data, i.e. it is small to select this for base station
Maximum in the received RSRP from all macro base stations of area user；For the received Microcell reporting of user in base station
The Reference Signal Received Power from current home micro-base station in data.CRE user and Microcell central user are not physics
Region division in meaning.
Further, the user in each macrocell is divided into macrocell boundary user and central user in the first step
In specific steps, including：
The RSRP and reference signal reception matter from current home macro base station that all reporting of user measurements of macrocell obtain
Measure (Reference Signal Receiving Quality, RSRQ)；
Macro cell base station selects RSRP minimums after the RSRP measurement results for belonging to all users in the cell are received
N number of macrocell user, be denoted asN number of user of RSRQ minimums is selected, is denoted asAccording to
Macrocell boundary user is selected, wherein, N is the positive integer set according to network condition, in order to is closed
Reason selects the second-rate user of macro-cell signals.
Further, the use that can cut into its interior Microcell is selected in the boundary user of each macrocell in the second step
Family, and be calculated in the specific steps of corresponding cell bias, including：
Macro base station i travels through its boundary user, i ∈ ΩMacro, ΩMacroFor all macro base station set in network, according to
If judging whether active user k accesses Microcell j can obtain the SINR than accessing current home macrocell i highers；
If can, according to
Active user k is calculated to cut the cell bias needed for the preselected Microcell j, by the user and is calculated
Cell biasing be denoted as
According to
Income setWherein, j ∈ ΛMacro,i, ΛMacro,iRepresent the micro-base station collection in macro base station i coverages
Close, ΩpicoFor all micro-base station set in network,User k is represented from the received RSRP of macro base station i,
Represent micro-base station j received RSRPs of the user k out of macro base station i coverages, Δ be one set according to network condition just
Value, it is therefore an objective to ensure that new bias switches successfully user k.
Further, the user that can cut into macrocell is selected in the CRE user of each Microcell in the second step, and counted
Calculation is obtained in the specific steps of corresponding cell bias, including：
Micro-base station j in macro base station i coverages travels through its CRE user, i ∈ ΩMacro, j ∈ ΛMacro,i, ΩMacroFor net
All macro base station set, Λ in networkMacro,iFor the micro-base station set in macro base station i coverages, according to
Judge if whether active user k accesses macrocell i can obtain to do than accessing the signal of current home Microcell j highers
Disturb noise ratio (Signal-to-Interference and Noise Ratio, SINR)；If can, according to
Active user k is calculated to cut the cell bias needed for preselected macrocell i, by the user and respective cell
Biasing is denoted as
According to
Income setWherein,User k is represented from the received RSRP of micro-base station j,
User k is represented from the received RSRP of macro base station i, Δ be set according to network condition one on the occasion of, it is therefore an objective to ensure new inclined
Putting value switches successfully user k.
Further, in the 4th step calculate macrocell i resources occupation rates according to rule be：
Wherein,Gather for the user of macrocell i；Represent the money needed for k-th of user of current macro cell
Source block number；Represent the resource block number that current macro cell is possessed.
Calculate Microcell j resources occupation rate according to rule be
Wherein,For user's set of Microcell j in macrocell i；Represent k-th of user institute of current micro cell
The resource block number needed；Represent the resource block number that Microcell is possessed.
Further, the resources occupation rate of Microcell j and the resource of macrocell i in macrocell i are calculated in the 4th step
The ratio of occupancy according to rule be：
Further, the step of the first step~the 6th is according to cycle T=N*TframeRepeat, the biasing of all micro-base stations
Adjustment is synchronous to be performed；Wherein TframeRepresent the time of the complete radio frames of TD-LTE mono-, be 10*TTI；TTI represents transmission time
Interval, is 1ms；N is positive integer, represent that adaptive cell extension biases the T that method of adjustment adjusts the cycle and includedframeNumber, takes
Value can be configured according to real network situation, and can use scope is [1,20].
Beneficial effect：A kind of adaptive cell extension biasing being used in TD-LTE-A heterogeneous networks provided by the invention is adjusted
Adjusting method, first, grand/Microcell reporting of user measurement are obtained related with signal receiving quality from macro base station and micro-base station
Parameter, macrocell user is divided into macrocell central user and macrocell edge customer, Microcell user is divided into micro-
Cell CRE user and Microcell central user；Then, cell is adjusted according to the load balance situation between macrocell and Microcell
Bias, if macrocell heavier loads, if macrocell select successively in boundary user access Microcell can obtain than access it is current
The user of home macro-cell higher SINR, active user is updated to cut needed for the preselected Microcell by cell biasing
Cell bias, is unloaded to Microcell by macrocell boundary user successively, until macrocell and the load balancing in small section；If
Micro-cell load is heavier, if Microcell is selected access macrocell in CRE user and can be obtained than access current home Microcell successively
The user of the SINR of higher, is updated to active user by cell biasing and is biased to cut the cell needed for the preselected macrocell
Value, cuts macrocell, until macrocell and the load balancing in small section by Microcell CRE user successively.Pass through iteration adjustment
Cell bias balances the load between macrocell and Microcell, is finally reached the target of dynamic community adjusting biasing.So as to
While the average throughput of the system of maintenance, the effective handling capacity for improving Cell Edge User in heterogeneous network.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Fig. 2 is the communication system architecture scene graph of the present invention.
Embodiment
A kind of adaptive cell extension biasing method of adjustment being used in TD-LTE-A heterogeneous networks proposed by the present invention, energy
The cell biasing of optimization is enough automatically selected, so that on the basis for the handling capacity for effectively improving Cell Edge User in heterogeneous network
On, reach the load balancing in macrocell and small section.
This programme is made further instructions with reference to embodiment.
Embodiment one
One TD-LTE-Advanced HetNet network of construction as shown in Figure 2, one shares 7 macrocells, each grand small
There are 2 Microcells in area's coverage.The frequency duplex factor as one of minizone is 1.Each Physical Resource Block bandwidth is 180kHz,
Distance between adjacent macro cell is 500 meters.In this example, each macrocell is uniform-distribution with 40 users, Cell Center User
It is 3 with cell edge area user's ratio：1, user centered on wherein No. 1-30, No. 31-40 is edge customer.Cell biasing is initial
It is worth for 3dB.Other important parameters in system are as shown in table 1 below：
Table 1：Systematic parameter in embodiment one
As shown in Figure 1, a kind of adaptive cell being used in TD-LTE-A heterogeneous networks provided in an embodiment of the present invention is expanded
Exhibition biasing method of adjustment, after the biasing of initial cell, the cycle performs following steps：
The first step：The ginseng from all macro base stations and current home micro-base station that all reporting of user measurements in Microcell obtain
Signal reception power (RSRP, Reference Signal Receiving Power) is examined, micro-base station receives and belongs to the cell
In all users measurement result after, according to
User in its cell is divided into CRE user (CRE-UE) and Microcell central user (Center-UE), and will
CRE user is dispatched on ABS, by the scheduling of Microcell central user on non-ABS.Wherein,It is received for base station
The most strong Reference Signal Received Power of interference from all macro base stations in the reporting of user data of Microcell, i.e. it is micro- to select this for base station
Maximum in the received RSRP from all macro base stations of community user；For on the received Microcell user in base station
Reference Signal Received Power from current home micro-base station of the count off in.
The RSRP and RSRQ from current home macro base station that macrocell user reporting measurement obtains, macro cell base station are selected
10 macrocell users of RSRP minimums, are denoted as10 users of RSRQ minimums are selected, are denoted as
According to
Select macrocell boundary user.The user distribution of Microcell is as shown in table 2 in macrocell 1 and its coverage
2 user distribution result of table
Second step：Accessed if macrocell is selected in boundary user when Microcell can be obtained than access current home macrocell more
The user of high SINR, and the preselected Microcell using the Microcell as active user.Concretely comprise the following steps macro base station i (i ∈
ΩMacro) its boundary user is traveled through, judge whether active user k meets
If satisfied, according to
Active user k is calculated to cut the cell bias needed for preselected Microcell j.By the user and calculate
Cell biasing is denoted asAnd according to
Income setWherein, ΛMacro,iRepresent macro base station i coverages
Interior micro-base station set,User k is represented from the received RSRP of macro base station i,Represent user k from macro base station
The received RSRP of micro-base station j in i coverages, Δ is operator set according to network condition one on the occasion of, it is therefore an objective to protect
Demonstrate,proving new bias switches successfully user k.
Microcell is selected and if macrocell is accessed in CRE user can obtain SINR's than access current home Microcell higher
User, and the preselected macrocell using the macrocell as active user.Concretely comprise the following steps micro- base in macro base station i coverages
Stand j (j ∈ ΛMacro,i) its CRE user is traveled through, judge whether active user k meets
If satisfied, according to
Active user k is calculated to cut the cell bias needed for preselected macro base station.By the user and respective cell
Biasing is denoted asAnd according to
Income setWherein,User k is represented from the received RSRP of micro-base station j,
User k is represented from the received RSRP of macro base station i, Δ is operator set according to network condition one on the occasion of, it is therefore an objective to ensure
New bias switches successfully user k.
AndData it is as shown in table 3：
Table 3AndData
3rd step：According to
Calculate macrocell i resources occupation rates.Wherein,Gather for the user of macrocell i；Represent current grand small
Resource block number needed for k-th of user in area；Represent the resource block number that current macro cell is possessed.
According to
Calculate the resources occupation rate of Microcell j.Wherein,For user's set of Microcell j in macrocell i；Table
Show the resource block number needed for k-th of user of current micro cell；Represent the resource block number that Microcell is possessed.It is small
The control base station (Pico) in area can be by X2 interface, either by S1 interfaces or by OAM (in Operations,Administration And Maintenance
The heart), or passed each zone user resources occupation rate in Microcell and handling capacity by the interface between base station and base station coordinator
Give the control base station of macrocell.The resources occupation rate of Microcell in macrocell 1 and its coverage is as shown in the table：
4 resources occupation rate table of table
| Macro i,Pico j | RE% |
| Pico1 | 35% |
| Pico2 | 20% |
| Macro i | RE% |
| Macro 1 | 80% |
According to
Calculate the ratio ω of the resources occupation rate of Microcell j and the resources occupation rate of macrocell i in macrocell ii,j.Macrocell 1
Resources occupation rate with Microcell in its coverage is than as shown in table 5
Table 5 is grand/Microcell resources occupation rate ratio
| Macroi,Picoj | ωi,j |
| Pico1 | 43.8% |
| Pico2 | 25% |
It can be seen from the above that the load in the small section in macrocell 1 and its coverage is very unbalanced, it is necessary to inclined to cell
Put and be adjusted.
4th step：If macrocell i and Microcell j load balancing, i.e. ωi,j∈[ω0,ω1], the cell of end Microcell j
Biasing adjustment；If Macro cell loads are heavier, i.e. ωi,j＜ ω0, into the 5th step；If Pico heavier loads, ωi,j＞ ω1,
Into the 6th step；
5th step：Still untreated user is taken out successively according to user's order in set, judges active user
After k switches Microcell j, whether required business demand can be met in ABS, that is, judge that can Microcell j provide
Resource block needed for active user k, if disclosure satisfy that, bias is adjusted toIn corresponding bias values, Yong Hugen
Reselecting and accessing for serving cell is carried out according to the bias after adjustment, and returns to the 3rd step.If terminating it is impossible to meet if
The cell biasing adjustment of Microcell j.
6th step：Still untreated user is taken out successively according to user's order in set, judges current use
After family k switches Macro, whether required business demand can be met in Macro, that is, judge that can macrocell i carry
For the resource block needed for active user k, if disclosure satisfy that, bias is adjusted toIn corresponding bias values, user
Reselecting and accessing for serving cell is carried out according to the bias after adjustment, and returns to the 3rd step.If being tied it is impossible to meet if
The cell biasing adjustment of beam Microcell j.
Iteration is biased by multiple cell, meets ωi,jAfter ∈ [0.5,1.5], each Microcell in 1 coverage of macrocell
Bias is as shown in the table：
Bias table after the completion of 6 cell of table biasing iteration
| Pico | Bias/dB |
| Pico1 | 6 |
| Pico2 | 9 |
The results are shown in Table 7 for user distribution：
7 user profile table of table
Macrocell 1 and the resources occupation rate ratio of Microcell in its coverage are as shown in table 8
Table 8 is grand/Microcell resources occupation rate ratio
| Macro i,Pico j | ωi,j |
| Pico1 | 52% |
| Pico2 | 64% |
As it can be seen that the load in the small section in final macrocell 1 and its coverage reaches balanced.
The step of the above-mentioned first step~the 6th is repeated according to cycle T=40ms.
Embodiment two
One TD-LTE-Advanced HetNet network of construction as shown in Figure 2, one shares 7 macrocells, each grand small
There are 2 Microcells in area's coverage.The frequency duplex factor as one of minizone is 1.Each Physical Resource Block bandwidth is 180kHz,
Distance between adjacent macro cell is 500 meters.In this example, each macrocell is uniform-distribution with 40 users, Cell Center User
It is 1: 3 with cell edge area user's ratio, user centered on wherein No. 1-10, No. 11-40 is edge customer.Cell biasing is initial
It is worth for 6dB.Other important parameters in system are as shown in table 9 below：
Table 9：Systematic parameter in embodiment two
A kind of adaptive cell extension biasing adjustment being used in TD-LTE-A heterogeneous networks provided in an embodiment of the present invention
Method, after the biasing of initial cell, the cycle performs following steps：
The first step：The letter of the reference from macro base station and current home micro-base station that all reporting of user measurements in Microcell obtain
Number receive power (RSRP, Reference Signal Receiving Power), micro-base station receive belong to institute in the cell
After having the measurement result of user, statistical average is done to RSRP, according to
User in its cell is divided into CRE user (CRE-UE) and Microcell central user (Center-UE), and will
CRE user is dispatched on ABS, by the scheduling of Microcell central user on non-ABS.Wherein,It is received for base station
The most strong Reference Signal Received Power of interference from all macro base stations in the reporting of user data of Microcell, i.e. it is micro- to select this for base station
Maximum in the received RSRP from all macro base stations of community user；For on the received Microcell user in base station
Reference Signal Received Power from current home micro-base station of the count off in.
The RSRP and RSRQ from current home macro base station that macrocell user reporting measurement obtains, macro cell base station are selected
10 macrocell users of RSRP minimums, are denoted as10 users of RSRQ minimums are selected, are denoted asRoot
According to
Select macrocell boundary user.The user distribution of Microcell is as shown in table 10 in macrocell 1 and its coverage
10 user distribution result of table
Second step：Accessed if macrocell is selected in boundary user when Microcell can be obtained than access current home macrocell more
The user of high SINR, and the preselected Microcell using the Microcell as active user.Concretely comprise the following steps macro base station i (i ∈
ΩMacro) its boundary user is traveled through, judge whether active user k meets
If satisfied, according to
Active user k is calculated to cut the cell bias needed for preselected Microcell j.By the user and calculate
Cell biasing is denoted asAnd according to
Income setWherein, ΛMacro,iRepresent macro base station i coverages
Interior micro-base station set,User k is represented from the received RSRP of macro base station i,Represent user k from macro base station
The received RSRP of micro-base station j in i coverages, Δ is operator set according to network condition one on the occasion of, it is therefore an objective to protect
Demonstrate,proving new bias switches successfully user k.
Microcell is selected and if macrocell is accessed in CRE user can obtain SINR's than access current home Microcell higher
User, and the preselected macrocell using the macrocell as active user.Concretely comprise the following steps micro- base in macro base station i coverages
Stand j (j ∈ ΛMacro,i) its CRE user is traveled through, judge whether active user k meets
If satisfied, according to
Active user k is calculated to cut the cell bias needed for preselected macro base station.By the user and respective cell
Biasing is denoted asAnd according to
Income setWherein,User k is represented from the received RSRP of micro-base station j,
User k is represented from the received RSRP of macro base station i, Δ is operator set according to network condition one on the occasion of, it is therefore an objective to ensure
New bias switches successfully user k.
AndData it is as shown in table 11：
Table 11AndData
3rd step：According to
Calculate macrocell i resources occupation rates.Wherein,Gather for the user of macrocell i；Represent current grand small
Resource block number needed for k-th of user in area；Represent the resource block number that current macro cell is possessed.
According to
Calculate the resources occupation rate of Microcell j.Wherein,For user's set of Microcell j in macrocell i；Table
Show the resource block number needed for k-th of user of current micro cell；Represent the resource block number that Microcell is possessed.It is grand small
The resources occupation rate of Microcell in area 1 and its coverage is as shown in the table：
12 resources occupation rate table of table
| Macro i | RE% |
| Macro 1 | 20% |
According to
Calculate the ratio ω of the resources occupation rate of Microcell j and the resources occupation rate of macrocell i in macrocell ii,j.Macrocell 1
Resources occupation rate with Microcell in its coverage is than as shown in table 13：
Table 13 is grand/Microcell resources occupation rate ratio
| Pico j | ωi,j |
| Pico1 | 4.35 |
| Pico2 | 4 |
It can be seen from the above that the load in the small section in macrocell 1 and its coverage is very unbalanced, it is necessary to inclined to cell
Put and be adjusted.
4th step：If macrocell i and Microcell j load balancing, i.e. ωi,j∈[ω0,ω1], the cell of end Microcell j
Biasing adjustment；If Macro cell loads are heavier, i.e. ωi,j＜ ω0, into the 5th step；If Pico heavier loads, ωi,j＞ ω1,
Into the 6th step；
5th step：Still untreated user is taken out successively according to user's order in set, judges active user
After k switches Microcell j, whether required business demand can be met in ABS, that is, judge that can Microcell j provide
Resource block needed for active user k, if disclosure satisfy that, bias is adjusted toIn corresponding bias values, Yong Hugen
Reselecting and accessing for serving cell is carried out according to the bias after adjustment, and returns to the 3rd step.If terminating it is impossible to meet if
The cell biasing adjustment of Microcell j.
6th step：Still untreated user is taken out successively according to user's order in set, judges current use
After family k switches Macro, whether required business demand can be met in Macro, that is, judge that can macrocell i carry
For the resource block needed for active user k, if disclosure satisfy that, bias is adjusted toIn corresponding bias values, user
Reselecting and accessing for serving cell is carried out according to the bias after adjustment, and returns to the 3rd step.If being tied it is impossible to meet if
The cell biasing adjustment of beam Microcell j.
Iteration is biased by multiple cell, meets ωi,jAfter ∈ [0.5,1.5], each Microcell in 1 coverage of macrocell
Bias is as shown in the table：
Bias table after the completion of 14 cell of table biasing iteration
| Pico | Bias/dB |
| Pico1 | 3 |
| Pico2 | 3 |
User distribution result is as shown in Table 15：
15 user profile table of table
Macrocell 1 and the resources occupation rate ratio of Microcell in its coverage are as shown in table 16
Table 16 is grand/Microcell resources occupation rate ratio
| Pico j | ωi,j |
| Pico1 | 61% |
| Pico2 | 73% |
As it can be seen that the load in the small section in final macrocell 1 and its coverage reaches balanced.
The step of the above-mentioned steps first step~the 6th is repeated according to cycle T=40ms.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of adaptive cell extension biasing method of adjustment being used in TD-LTE-A heterogeneous networks, it is characterised in that initial
After changing cell biasing, the cycle performs following steps：
The first step：The related parameter of signal receiving quality based on reporting of user, is divided into Microcell by the user in each Microcell
Spreading range region (CRE) user and central user, and, the user in each macrocell is divided into macrocell boundary user with
Heart user；
Second step：The user that can cut into its interior Microcell j is selected in the boundary user of macrocell i, and is calculated corresponding
Cell bias, by user and corresponding bias composition setSelected in the CRE user of Microcell j can cut into it is grand
The user of cell i, and corresponding cell bias is calculated, by user and corresponding bias composition setIts
In, i ∈ ΩMacro, j ∈ ΛMacro,i, ΩMacroFor all macro base station set, Λ in networkMacro,iFor in macro base station i coverages
Micro-base station set；
3rd step：The resources occupation rate of each macrocell and each Microcell is calculated, and the resource for calculating Microcell j in macrocell i accounts for
With the ratio ω of rate and the resources occupation rate of macrocell ii,j；
4th step：According to ωi,jThe cell bias of value adjustment Microcell j, if ωi,jWithin the scope of default, then terminate micro-
The cell biasing adjustment of cell j；If ωi,jLess than default range lower limit, then into the 5th step；If ωi,jMore than default model
Limit is placed, then into the 6th step；
5th step：According toThe order of bias from small to large in set takes out still untreated user successively, judges
After active user k switches Microcell j, if required business demand can be met in cell, the biasing of Microcell j
It is adjusted toBias needed for the active user k incisions Microcell j of middle storage, user is according to the bias after adjustment
Reselecting and accessing for serving cell is carried out, and returns to the 3rd step；Biased if the cell for terminating Microcell j it is impossible to meet if
Adjustment；
6th step：According toThe order of bias from small to large in set takes out still untreated user successively, sentences
After disconnected active user k switches macrocell, if required business demand can be met in macrocell, Microcell j's
Cell biasing is adjusted toBias needed for the active user k incision macrocells i of middle storage, after user is according to adjustment
Bias carry out serving cell and reselecting and accessing, and the 3rd step is returned to, if terminating Microcell j's it is impossible to meet if
Cell biasing adjustment；
The user in each Microcell is divided into the specific steps of Microcell CRE user and central user in the first step, is wrapped
Include：
The Reference Signal Received Power from macro base station and current home micro-base station that all reporting of user measurements in Microcell obtain
(RSRP)；
Microcell base station after the RSRP measurement results for belonging to all users in the cell are received, according to
Divide and dispatch the user in its cell, by Microcell CRE user (CRE-UE) scheduling on ABS, by small district center
User (Center-UE) is dispatched on non-ABS；Wherein,For in the received Microcell reporting of user data in base station
The most strong Reference Signal Received Power of interference from all macro base stations, i.e. base station select that Microcell user is received to come from institute
There is the maximum in the RSRP of macro base station；Currently return for coming from the received Microcell reporting of user data in base station
Belong to the Reference Signal Received Power of micro-base station；
The user in each macrocell is divided into the specific steps of macrocell boundary user and central user in the first step, is wrapped
Include：
The RSRP and Reference Signal Received Quality from current home macro base station that all reporting of user measurements of macrocell obtain
(RSRQ)；
Macro cell base station selects the N of RSRP minimums after the RSRP measurement results for belonging to all users in the cell are received
A macrocell user, is denoted asN number of user of RSRQ minimums is selected, is denoted asAccording to
Macrocell boundary user is selected, wherein, N is the positive integer set according to network condition；
The user that can cut into its interior Microcell is selected in the second step in the boundary user of each macrocell, and phase is calculated
In the specific steps for the cell bias answered, including：
Macro base station i travels through its boundary user, i ∈ ΩMacro, ΩMacroFor all macro base station set in network, according to
If judging whether active user k accesses Microcell j can obtain the SINR than accessing current home macrocell i highers；If can,
According to
Cell biases of the active user k needed for incision Microcell j is calculated, by the user and the cell calculated biasing note
For
According to
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Income setIn, i ∈ ΩMacro,j∈ΛMacro,i, ΛMacro,iRepresent the micro-base station in macro base station i coverages
Set, ΩpicoFor all micro-base station set in network,User k is represented from the received RSRP of macro base station i,
Represent micro-base station j received RSRPs of the user k out of macro base station i coverages, Δ be one set according to network condition just
Value；
The user that can cut into macrocell is selected in the second step in the CRE user of each Microcell, and is calculated corresponding
In the specific steps of cell bias, including：
Micro-base station j in macro base station i coverages travels through its CRE user, i ∈ ΩMacro, j ∈ ΛMacro,i, ΩMacroFor in network
All macro base station set, ΛMacro,iFor the micro-base station set in macro base station i coverages, according to
If judging whether active user k accesses macrocell i can be obtained than access current home Microcell j highers
SINR；If can, according to
Active user k is calculated to cut the cell bias needed for preselected macrocell i, the user and respective cell are biased
It is denoted as
According to
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Income setWherein,User k is represented from the received RSRP of micro-base station j,Represent
User k from the received RSRP of macro base station i, Δ be according to network condition set one on the occasion of.
A kind of 2. adaptive cell extension biasing adjustment side being used in TD-LTE-A heterogeneous networks according to claim 1
Method, it is characterised in that in the 3rd step calculate macrocell i resources occupation rates according to rule be：
Wherein,Gather for the user of macrocell i；Represent the number of resource blocks needed for k-th of user of current macro cell
Mesh；Represent the resource block number that current macro cell is possessed；
Calculate Microcell j resources occupation rate according to rule be：
Wherein,For user's set of Microcell j in macrocell i；Needed for k-th of user for representing current micro cell
Resource block number；Represent the resource block number that Microcell is possessed.
A kind of 3. adaptive cell extension biasing adjustment side being used in TD-LTE-A heterogeneous networks according to claim 2
Method, it is characterised in that the resources occupation rate of Microcell j and the resource occupation of macrocell i in macrocell i are calculated in the 3rd step
The rule of the ratio of rate is：
A kind of 4. adaptive cell extension biasing adjustment side being used in TD-LTE-A heterogeneous networks according to claim 1
Method, it is characterised in that the step of the first step~the 6th is according to cycle T=N*TframeRepeat, the biasing tune of all micro-base stations
Whole synchronous execution；Wherein TframeRepresent the time of the complete radio frames of TD-LTE mono-, N is positive integer.
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| CN105430728B (en) * | 2015-12-08 | 2018-12-18 | 同济大学 | The uplink power control method based on Optimum Theory for Microcell |
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