CN104640177A - Energy-efficiency-based cell selection method for multilevel heterogeneous network - Google Patents
Energy-efficiency-based cell selection method for multilevel heterogeneous network Download PDFInfo
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- CN104640177A CN104640177A CN201510109172.7A CN201510109172A CN104640177A CN 104640177 A CN104640177 A CN 104640177A CN 201510109172 A CN201510109172 A CN 201510109172A CN 104640177 A CN104640177 A CN 104640177A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0247—Traffic management, e.g. flow control or congestion control based on conditions of the access network or the infrastructure network
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- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to an energy-efficiency-based cell selection method for a multilevel heterogeneous network, and belongs to the technical field of wireless communication. The method comprises the following steps that 1, users calculate own alternative base station lists and selection degree of freedom information, and report the information to all base stations in the alternative base station lists; 2, all the base stations share own basic information and the information reported by the users; 3, the base stations select the user of which the selection degree of freedom is minimum every time, and determine a cell selected by the user according to a designed new criterion; 4, the base stations update the original alternative base station list and selection degree of freedom information; 5, steps 3 and 4 are cyclically executed until each user selects the corresponding access cell. According to the method, differences of different base stations are ignored, and the SINR (Signal to Interface and Noise Ratio) required by each user, loads of the base stations and the utilization efficiency of the users for the energy of the base stations of the cells are comprehensively taken into account, so that the quality of service for the users is ensured, the phenomena of load non-uniformity and user starvation are avoided, and the energy utilization efficiency of the users is improved.
Description
Technical field
The invention belongs to wireless communication technology field, particularly multilayer heterogeneous wireless cellular network technical field, relate to the cell selecting method based on efficiency in a kind of multilayer heterogeneous network.
Background technology
Along with the arrival in mobile Internet epoch, data traffic increases outburst, and user experiences network and proposes higher demand, and multilayer heterogeneous network (Heterogeneous Network, HetNet) arises at the historic moment.Compared to conventional monolayers network, different types of access node is contained in heterogeneous network, comprise macrocell base stations and various small cell base station, in the face of different nodes, user select the access of which base station obtain serving more reasonable, traditional community selection criterion for single layer network design becomes one of challenge of multilayer heterogeneous network faces, because will no longer be applicable to multilayer heterogeneous network.
In single layer network, generally adopt based on maximum signal to noise ratio (Signal to Interference and Noise Ratio, SINR) cell selecting method, the method makes user select access to oneself providing the base station of maximum SINR to obtain service.Such selection criterion is only applicable to business and is uniformly distributed, and the single layer network that each cell base station power maintains an equal level mutually.In layer stereo heterogeneous network, each cell base station down transmitting power is different, and the cell selecting method based on maximum signal to noise ratio can cause high-power overloaded base stations, and small-power base station utilizes not exclusively, causes serious load imbalance problem.
In addition, along with " green communications " propose conceptually, cell selecting method in layer stereo heterogeneous network also should consider energy utilization efficiency (Energy Efficiency, EE), user is when selecting community, except considering the demand of self, the energy that this base station provides after also needing to consider access base station, can be made full use of.
Summary of the invention
In view of this, the object of the present invention is to provide the cell selecting method based on efficiency in a kind of multilayer heterogeneous network, the method can consider the SINR that user requires, the available resources of community and user are to the utilization ratio of energy.
For achieving the above object, the invention provides following technical scheme:
Based on a cell selecting method for efficiency in multilayer heterogeneous network, comprise the following steps:
Step one: user calculates the candidate BS list of oneself with selection degree of freedom information and by this information reporting to all base stations in its candidate BS list; Step 2: respective essential information and the information of reporting of user are shared in all base stations; Step 3: base station is selected at every turn and selected the minimum user of the degree of freedom and determine according to designed New standard the community that this user selects; Step 4: base station upgrades original candidate BS list and selects degree of freedom information; Step 5: circulation performs step 3 and step 4, until each user have selected access community.
Further, in step one, user calculates the candidate BS list of oneself and selects degree of freedom information and by this information reporting to all base stations in its candidate BS list, specifically comprise:
1) user u receives from each base station (BS
1, BS
2, BS
3..., BS
n) reference signal, and by receive reference signal power: RSRP
1, RSRP
2, RSRP
3..., RSRP
nthe SINR value that can reach when calculating the corresponding base station i of access
computing formula is:
Wherein n ∈ 1,2,3 ..., N} represents the numbering of corresponding base station, also the numbering of i.e. respective cell, N
0for the power spectral density of white Gaussian noise; If corresponding SINR can meet the requirement of user, that is, when
time, base station i provides the service met the demands, so user u just adds base station i to the candidate BS list C of oneself just can to user u
u={ BS
1, BS
2..., BS
l;
2) the selection degree of freedom D of user u
ube defined as: D
u=| C
u|, be candidate BS number;
3) the candidate BS list obtained and the selection degree of freedom are reported each candidate BS by each user.
Further, in step 2, respective essential information and the information of reporting of user are shared in all base stations, and shared information specifically comprises two classes: a class is the essential information of each base station, comprise this base station numbering, are also cell number n, maximum available resources number RB
n_max, maximum load L
n_max, and down transmitting power P
n; Another kind of is the relevant information of reporting of user, comprises Customs Assigned Number u, and corresponding candidate BS list C
uwith selection degree of freedom D
u.
Further, in step 3, base station is selected at every turn and is selected the minimum user of the degree of freedom and determine specifically to comprise the community that this user selects according to designed New standard:
1), after information is shared in each base station, all users arrange according to the non-decreasing order of the selection degree of freedom size of user by base station, when there being the selection degree of freedom of multiple user identical, and this multiple user of random alignment;
2) choose the user made number one, namely select the user that the degree of freedom is minimum, consider the available resources of its alternative cell, load and energy utilization efficiency, for this user determines to access community.
Further, above-mentioned steps 2) comprise the following steps:
21) first formula is used
calculate the energy utilization efficiency that user u accesses alternative cell i, wherein:
the bandwidth B of the transmission rate of user u, transfer resource
rBrepresent;
be the gross power that base station consumes, be made up of two parts, be specifically expressed as
section 1 P in formula
i_0represent the constant power that base station consumes, the Δ in Section 2
iit is an invariant relevant with base station kind;
22) according to resource and the load calculating weights of base station
formula is as follows:
Wherein L
irepresent the load that base station i is current,
represent the capacity redundancy of base station i,
it is the probability that when adopting polling dispatching method, user obtains service;
23) the definition access factor
to each user u, the corresponding access factor of its each candidate BS, the cell i that user u will select the access factor maximum
t=arg
i{ max (θ
i);
24) cell i of user u is determined
tafter, mark this user for processed, and by the cell i selected
tfeed back one and permit access signaling to user.
Further, in step 4, base station upgrades candidate BS list and selects the degree of freedom specifically to comprise:
1) after a user have selected a community, original relevant information that each cell update oneself stores, the load of this community by L
ibe updated to L
i+ 1;
2) after a user have selected a community, if this community is fully loaded with just, the load L after namely upgrading
i+ 1=L
i_max, mean that this community can not be selected for other users again, detect and whether there is this community in untreated user, if had, in the alternative cell list of this user, delete this community, and the selection degree of freedom of this user by D
ube updated to D
u-1.
Further, step 5 specifically comprises: arrange untreated user according to the non-decreasing order of the selection degree of freedom after upgrading, when there being the selection degree of freedom of multiple user identical, and this multiple user of random alignment; Calculate the selective factor B of each base station corresponding to each untreated user according to the information after upgrading, computational methods with involved by above-mentioned step 3, and access community for user is selected; Each base station just upgrades once stored information after often processing a user; After processing each user, stop terminating.
Beneficial effect of the present invention is: method provided by the invention can ignore the otherness of different base station, consider the SINR of the requirement of user, the load of base station and user are to the service efficiency of cell base station energy, thus ensure the service quality of user, avoid the uneven and user of load to die of hunger phenomenon, and promote the utilization ratio of user to energy.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the schematic diagram of multilayer heterogeneous cellular network in the embodiment of the present invention;
Fig. 2 is the general flow chart of the method for the invention;
Fig. 3 is that user calculates respective candidate BS and selects degree of freedom information and report the flow chart of corresponding base station;
Fig. 4 is the schematic diagram of two category informations shared between each base station;
Fig. 5 is the flow chart selected the minimum user of the degree of freedom and determine the community that this user selects according to designed New standard.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is the schematic diagram of multilayer heterogeneous cellular network in the embodiment of the present invention, and the multilayer heterogeneous network packet of this full frequency multiplex is containing a macrocell base stations and some small cell base station, and they form collection of base stations β={ BS jointly
1, BS
2, BS
3..., BS
n, there is a unique sequence number N={1 each base station, and 2,3 ..., N}.All base stations are all operated in open access module (Open Access Mode), and the user of some is randomly dispersed in this region, and all users have the right to access any one base station BS
n.The transfer resource that each user can only take a base station transmits.
Fig. 2 is the general flow chart of this method, and as can be seen from the figure this method mainly contains five steps, will introduce the detailed process of each step in detail below.
Steps A: user calculates respective alternative cell and selects degree of freedom information and report corresponding base station.
The detailed process of this step is see Fig. 3, and steps A comprises altogether 3 key steps:
Steps A 1, user collects the reference signal (Reference Signal, RS) from each base station.
Particularly, each base station can the reference signal of theaomni-directional transmission oneself, any one user u can receive the reference signal from each base station like this, and this signal contains the numbering of its corresponding base station, and corresponding one of each reference signal receives reference signal power: { RSRP
u, 1, RSRP
u, 2, RSRP
u, 3..., RSRP
u, N, corresponding to base station { BS respectively
1, BS
2, BS
3..., BS
nreference signal.The calculating formula of RSRP is RSRP
u, n=P
nh
u, n, P in base
nfor the down transmitting power of some base stations, h
u, nit is the channel gain between user u and base station n.
Steps A 2, user utilizes the RSRP information of collection, calculates and is linked into the obtainable SINR in each community.
Particularly, when user u is linked into a certain base station i, its corresponding SINR calculating formula is:
wherein N
0for Gaussian noise power spectral density, each user can obtain N number of SINR value.
Steps A 3, user generates alternative cell list C
uwith selection degree of freedom D
u.
Particularly, if
base station i provides the service met the demands, so user u just adds base station i to the candidate BS list C of oneself just can to user u
uin, and D
u=| C
u| select the degree of freedom as it.Each user performs this step, and each like this user can obtain the candidate BS list of oneself and select degree of freedom information, and these information reportings to base station.
Step B: information all is separately shared in all base stations.
Particularly, see Fig. 4, shared information spinner will comprise two classes, and a class is base station relevant information, as shown in Fig. 4 (a), comprises base station numbering n, maximum available resources number RB
n_max, maximum load L
n_max, and down transmitting power P
n; Another kind of is user related information, as shown in Fig. 4 (b), comprises Customs Assigned Number u, the candidate BS list C of user
u, and the selection degree of freedom D of this user
u.Maximum available resources number determines base station simultaneously can serve how many users by most multipotency, specify that each user can only be assigned with a resource, maximum load is the number of users of the most multipotency service in base station, and these users are served by base station scheduling, and each dispatched users number is maximum available resources number.
Step C: being that a user is selected according to newly-designed method accesses community.
The detailed process of this step, see Fig. 5, comprises four key steps altogether:
Step C1, a untreated user is selected in base station.
Particularly, user is subtracted order arrangement according to selection degree of freedom size by non-by each base station, when there being the selection degree of freedom of multiple user identical, and this multiple user of random alignment.Then the user that makes number one is selected as the object being about to process.
Step C2, calculates the energy efficiency that this user can reach under each candidate BS.
Particularly, formula is used
calculate the energy utilization efficiency that user u accesses candidate BS i, wherein
the bandwidth B of the transmission rate of user u, transfer resource
rBrepresent.
be the gross power that base station consumes, be made up of two parts, be specifically expressed as
section 1 P in formula
i_0represent the constant power that base station consumes, the Δ in Section 2
iit is an invariant relevant with base station kind.
Step C3, calculates the access factor that this user accesses each community.
Particularly, define user u and access the cell i access factor
wherein weights
relevant with load with the resource of base station, calculating formula is as follows:
Wherein L
irepresent the load that base station i is current,
represent the capacity redundancy of base station i.
be the probability that when adopting polling dispatching method, user obtains service, to different dispatching methods, this expression formula can be different.
Step C4 is this user selected access community.
Particularly, the cell i that the access factor is maximum is selected
t=arg
i{ max{ θ
i) be the access community of this user, and send one to this user by selected community to permit access signaling, and mark the user as processed.
Step D: all base stations upgrade the base station relevant information and user related information that store.
Particularly, after a user have selected a community, the load of this community by L
ibe updated to L
i+ 1.If this community is fully loaded with just, the load L after namely upgrading
i+ 1=L
i_max, mean that this community again for other users, can not be detected and whether there is this community in the alternative cell list of untreated user, if had, in the alternative cell list of relative users, delete this community, and the selection degree of freedom of this user by D
ube updated to D
u-1.
Step e: circulation performs step C and step D, until all processed reef knot bundle of all users.
Particularly, arrange untreated user according to the non-decreasing order of the selection degree of freedom after upgrading, when there being the selection degree of freedom of multiple user identical, this multiple user of random alignment, and select the user made number one to be handling object.Calculate the selective factor B of each candidate BS of this user according to the cell information after renewal, computational methods with shown in above-mentioned steps D, and are user's selected access community.Each base station just upgrades primary information after often processing a user.After processing each user, the method terminates.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (7)
1. in multilayer heterogeneous network based on a cell selecting method for efficiency, it is characterized in that: comprise the following steps:
Step one: user calculates the candidate BS list of oneself with selection degree of freedom information and by this information reporting to all base stations in its candidate BS list; Step 2: respective essential information and the information of reporting of user are shared in all base stations; Step 3: base station is selected at every turn and selected the minimum user of the degree of freedom and determine according to designed New standard the community that this user selects; Step 4: base station upgrades original candidate BS list and selects degree of freedom information; Step 5: circulation performs step 3 and step 4, until each user have selected access community.
2. in a kind of multilayer heterogeneous network according to claim 1 based on the cell selecting method of efficiency, it is characterized in that: in step one, user calculates the candidate BS list of oneself and selects degree of freedom information and by this information reporting to all base stations in its candidate BS list, specifically comprise:
1) user u receives from each base station (BS
1, BS
2, BS
3..., BS
n) reference signal, and by receive reference signal power: RSRP
1, RSRP
2, RSRP3 ..., RSRP
nthe SINR value that can reach when calculating the corresponding base station i of access
computing formula is:
Wherein n ∈ 1,2,3 ..., N} represents the numbering of corresponding base station, also the numbering of i.e. respective cell, N
0for the power spectral density of white Gaussian noise; If corresponding SINR can meet the requirement of user, that is, when
time, base station i provides the service met the demands, so user u just adds base station i to the candidate BS list C of oneself just can to user u
u={ BS
1, BS
2..., BS
l;
2) the selection degree of freedom D of user u
ube defined as: D
u=| C
u|, be candidate BS number;
3) the candidate BS list obtained and the selection degree of freedom are reported each candidate BS by each user.
3. in a kind of multilayer heterogeneous network according to claim 1 based on the cell selecting method of efficiency, it is characterized in that: in step 2, respective essential information and the information of reporting of user are shared in all base stations, the information shared specifically comprises two classes: a class is the essential information of each base station, comprise this base station numbering, also be cell number n, maximum available resources number RB
n_max, maximum load L
n_man, and down transmitting power P
n; Another kind of is the relevant information of reporting of user, comprises Customs Assigned Number u, and corresponding candidate BS list C
uwith selection degree of freedom D
u.
4. in a kind of multilayer heterogeneous network according to claim 1 based on the cell selecting method of efficiency, it is characterized in that: in step 3, base station is selected at every turn and is selected the minimum user of the degree of freedom and determine specifically to comprise the community that this user selects according to designed New standard:
1), after information is shared in each base station, all users arrange according to the non-decreasing order of the selection degree of freedom size of user by base station, when there being the selection degree of freedom of multiple user identical, and this multiple user of random alignment;
2) choose the user made number one, namely select the user that the degree of freedom is minimum, consider the available resources of its alternative cell, load and energy utilization efficiency, for this user determines to access community.
5. in a kind of multilayer heterogeneous network according to claim 4 based on the cell selecting method of efficiency, it is characterized in that:
Step 2) comprise the following steps:
21) first formula is used
calculate the energy utilization efficiency that user u accesses alternative cell i, wherein:
the bandwidth B of the transmission rate of user u, transfer resource
rBrepresent;
be the gross power that base station consumes, be made up of two parts, be specifically expressed as
section 1 P in formula
i_0represent the constant power that base station consumes, the Δ in Section 2
iit is an invariant relevant with base station kind;
22) according to resource and the load calculating weights of base station
formula is as follows:
Wherein L
irepresent the load that base station i is current,
represent the capacity redundancy of base station i,
it is the probability that when adopting polling dispatching method, user obtains service;
23) the definition access factor
to each user u, the corresponding access factor of its each candidate BS, cell i '=arg that user u will select the access factor maximum
i{ max (θ
i);
24) after determining the community l ' of user u, mark this user for processed, and permitted access signaling to user by the community l ' feedback one selected.
6. in a kind of multilayer heterogeneous network according to claim 1 based on the cell selecting method of efficiency, it is characterized in that: in step 4, base station upgrades candidate BS list and selects the degree of freedom specifically to comprise:
1) after a user have selected a community, original relevant information that each cell update oneself stores, the load of this community by L
ibe updated to L
i+ 1;
2) after a user have selected a community, if this community is fully loaded with just, the load L after namely upgrading
i+ 1=L
i_max, mean that this community can not be selected for other users again, detect and whether there is this community in untreated user, if had, in the alternative cell list of this user, delete this community, and the selection degree of freedom of this user by D
ube updated to D
u-1.
7. in a kind of multilayer heterogeneous network according to claim 1 based on the cell selecting method of efficiency, it is characterized in that: step 5 specifically comprises: arrange untreated user according to the non-decreasing order of the selection degree of freedom after upgrading, when there being the selection degree of freedom of multiple user identical, this multiple user of random alignment; Calculate the selective factor B of each base station corresponding to each untreated user according to the information after upgrading, computational methods with involved by above-mentioned step 3, and access community for user is selected; Each base station just upgrades once stored information after often processing a user; After processing each user, stop terminating.
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| CN106888489A (en) * | 2017-03-15 | 2017-06-23 | 广东欧珀移动通信有限公司 | A kind of quick connecting method and device of 4G networks |
| WO2018166212A1 (en) * | 2017-03-15 | 2018-09-20 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for connecting to 4g network and terminal equipment |
| US10292124B2 (en) | 2017-03-15 | 2019-05-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for connecting to 4G network and terminal equipment |
| CN107889187A (en) * | 2017-11-16 | 2018-04-06 | 北京邮电大学 | The method, apparatus and electronic equipment of base station access by terminal |
| CN107889187B (en) * | 2017-11-16 | 2021-01-01 | 北京邮电大学 | Method and device for accessing terminal to base station and electronic equipment |
| CN108200609A (en) * | 2018-01-05 | 2018-06-22 | 重庆邮电大学 | A kind of cell selecting method suitable for 5G green communications |
| CN108200609B (en) * | 2018-01-05 | 2020-05-12 | 重庆邮电大学 | Cell selection method suitable for 5G green communication |
| CN109041117A (en) * | 2018-10-19 | 2018-12-18 | 安徽大学 | The selection method and system of a kind of serving BS in dense network |
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