CN107155201A - It is a kind of to reduce the customer center network service district system of selection of access congestion - Google Patents
It is a kind of to reduce the customer center network service district system of selection of access congestion Download PDFInfo
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- CN107155201A CN107155201A CN201610126085.7A CN201610126085A CN107155201A CN 107155201 A CN107155201 A CN 107155201A CN 201610126085 A CN201610126085 A CN 201610126085A CN 107155201 A CN107155201 A CN 107155201A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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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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- Computer Networks & Wireless Communication (AREA)
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- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The customer center network service district system of selection of access congestion is reduced the invention discloses a kind of, is comprised the following steps：User is evaluated adjacent multiple serving cells when selecting serving cell using selectance value；Based on the result of the evaluation, selected section user uses the serving cell of suboptimum result of calculation.The customer center network service district system of selection provided using the present invention, when the scene or a large number of users for facing intensive user may concurrently access the scene of same base, can effectively alleviate resource congestions problems.
Description
Technical field
The present invention relates to a kind of service cell selection method, more particularly to a kind of reference selectance value
Adaptively selected serving cell or set of cells, are accessed in the user of congestion so as to reduce certain base station
The system of selection of heart network service district, belongs to wireless communication technology field.
Background technology
Traditional cordless communication network may be considered network and dominate or network-centric, wherein,
User enters line period or aperiodic measurement is reported, then by the base station in network or the pipe of higher
Manage entity and complete assignment decisions, and the result of decision is handed down to terminal user.In recent years, You Renti
The concept of customer center network is gone out, it is basic that the System Design of cordless communication network is undergoing some
The change of property.
The stronger user service for calling family the to be experienced experience of the concept of customer center network in itself.
Under this framework, the degree of optimization and intelligence degree of Internet resources will be higher, the uniformity clothes of user
Business experience also preferably will be strengthened and be ensured.For example, the certain methods or framework that propose recently,
The virtual subdistrict that cooperative multipoint transmission, foundation such as towards edge customer are moved with user, all may be used
To be considered the effective ways that user service experience is lifted in customer center network.
In customer center network, one or more suitable serving cells how are efficiently selected,
It is the key issue for lifting user service experience.However, the small differentiation with traditional dynamic or static state
There is obvious cluster border different after cluster, when serving cell or set of cells customer-centric are selected
When selecting, the base station of each serving cell will likely be chosen by the user of multiple different fringe regions simultaneously,
Now, the service cell set of customer-centric is there is no clearly cluster border, but occurs many
Individual overlapping serving cell.This phenomenon can be protruded more in many focus intensive user scenes of 5G.
As user density is significantly increased in network, the multiple same cells of intensive user request access it is general
Rate also can be improved accordingly.In the case of limited Radio Resource, this phenomenon will bring serious connect
Enter congestion problems, that is to say, that the base station preferentially chosen will likely can not meet whole service requests,
And then reduce the service quality (QoS) of certain customers.
Solved with the following method in view of the above-mentioned problems, mainly adopting in the prior art：
(1) cell selecting method based on link signal quality
Here link signal quality can be Reference Signal Received Power, Reference Signal Received Quality,
The parameters such as received signal strength indicator, signal to noise ratio, Signal to Interference plus Noise Ratio.In general, such cell is selected
Selection method is all, signal quality strong cell strong and weak for selection gist with the signal quality of transmission link
By the first choice as user.
(2) cell selecting method of link signal quality and load of base station state is considered
The above-mentioned cell selecting method based on link signal quality only only accounts for the transmission shape of link
State, without the occupation condition in view of base station itself.This can bring following potential problems：
The transmission link signal quality of user's selection very well, but base station (or will) in fully loaded or
Person is close to fully loaded state, then user is it is possible to sufficient transfer resource guarantee can not be obtained.Cause
This, relative to simple link signal quality system of selection, considers link signal quality and base
The side for load condition (can be current load state, the load state also either predicted) of standing
Method, helps more effectively to select suitable serving cell or set of cells.
But, when multiple users are in mutually adjacent geographical position, it will usually measure and more connect
Near link signal quality (especially large scale signal), bears while can also receive identical base station
Load state.Now, no matter according to which kind of above-mentioned cell selecting method, all multiple users can be caused same
The base station (or collection of base stations) that Shi Xuanzhong is identical or degree of overlapping (overlapping) is very high.This
In the case that base station wireless resource is limited, it will cause certain customers actually can not effectively be taken
Business.And this problem can be protruded more with the increase of proximity intra domain user dense degree.
The content of the invention
In view of the shortcomings of the prior art, the technical problems to be solved by the invention are to provide a kind of
The customer center network service district system of selection of reduction access congestion.
To realize above-mentioned goal of the invention, the present invention uses following technical schemes：
It is a kind of to reduce the customer center network service district system of selection of access congestion, including following step
Suddenly：
User is entered when selecting serving cell using selectance value to adjacent multiple serving cells
Row is evaluated；
Based on the result of the evaluation, selected section user is small using the service of suboptimum result of calculation
Area.
Wherein more preferably, the selectance value is with customer service demand characteristic, load of base station shape
State and link-state information for the function of variable result of calculation.
Wherein more preferably, the function is metric_value=α f1(CSI)-β·f2(load)-γ·f3(traffic)；
Wherein, metric_value is the selectance value, f1(CSI) it is sign link-state information
Metric function, f2(load) it is the metric function of sign load of base station state, f3(traffic) it is table
Take over the metric function of family business demand feature for use, α >=0, β >=0, γ >=0 is respectively Link State letter
Breath, load of base station state, the weighted factor of customer service demand characteristic.
Wherein more preferably, the customer service demand characteristic includes but is not limited to：The speed of user will
Ask, the grade of the delay requirement of user or customer service quality is indicated.
Wherein more preferably, the load of base station state includes but is not limited to：Base station is currently serviced
Estimation load information in the load information of user or the following certain time period of base station prediction.
Wherein more preferably, the suboptimum result of calculation refers to the selectance value obtained according to calculating,
Meeting on the premise of user transmitted with business need substantially, its in addition to Optimal calculation result
His all feasible selection results.
Wherein more preferably, serving cell selection course is performed in user terminal, comprised the following steps：
User measures the channel quality of multiple Radio Links to obtain link-state information, receives nothing
The corresponding load of base station state of wired link, and obtain the customer service demand characteristic of itself；
User is obtained after various information, calculates selectance value, selects suitable according to result of calculation
One or more candidate service cells.
Wherein more preferably, serving cell selection course is performed in base station end, comprised the following steps：
Base of the link-state information for multiple Radio Links that reporting of user measurement is obtained to place
Stand；
Adjacent base station interacts respective load of base station state to the base station；
The base station is according to the measurement result of user, the load information of adjacent base station and user's industry
Business demand characteristic, calculates selectance value；And selected to be adapted to specific user's according to result of calculation
Base station or collection of base stations, and selection result is interacted with adjacent base station.
Wherein more preferably, according to probability selection selected section user, wherein the probability parameter used is suitable
Together in the system-level parameters of all users, user is handed down to as configuration parameter by base station.
Or, according to probability selection selected section user, wherein the probability parameter used is user class
Parameter, environment sensing or empirical learning sets itself and optimization are utilized by user.
The customer center network service district system of selection provided using the present invention, it is intensive facing
When the scene or a large number of users of user may concurrently access the scene of same base, Ke Yiyou
Effect alleviates resource congestions problems.
Brief description of the drawings
Fig. 1 be embodiments of the invention in, the schematic diagram of base station deployment and user distribution.
Embodiment
The technology contents of the present invention are done with further detailed with specific embodiment below in conjunction with the accompanying drawings
Explanation.
The present invention is directed to the key issue that serving cell in customer center network is difficult to selection, proposes
Introduce the technical thought of customer service demand characteristic this user profile progress serving cell selection.
Meanwhile, by allowing certain customers to be adaptive selected base station or the collection of base stations of suboptimum result of calculation,
So as to actively avoid possible congestion results.Above-mentioned technical proposal can effectively reduce or alleviate base
The Radio Resource pressure stood, be particularly suitable for a large number of users concurrently access same base station or
It is chosen the too high situation of access base station overlapping degree.Below to this detailed specific description of expansion.
In the first embodiment of the present invention, it is assumed that random placement is multiple in a certain rectangular area
Base station, wherein the adjacent area in base station A, B has intensive user distribution, as shown in Figure 1.
In the present invention, the base station can be the access point of multiple different systems, such as 3G systems
WiFi access points of NodeB (NB), the eNB of 4G systems and wlan system etc..In addition,
Select serving cell consistent up to implication with selection base station table, represent that selection provides the user service
Access point.
In Fig. 1, triangle represents origination base station, and black round dot represents real-time traffic users, ash
Color round dot represents non-real-time service user.Base station A and B represent the candidate base station of user.Meanwhile,
Assuming that base station selection procedure is completed in user terminal.For convenience of flow description, user is limited except existing
Have outside the service link of serving cell, the extra selectable serving cell number upper limit is 1.Need
It is noted that the serving cell number upper limit can be adjusted to other any positive integers, this
The there is provided method of invention stands good.
On the other hand, in this embodiment to load of base station, link signal quality and customer service
Type does hypothesis below：
On load of base station, it is assumed that base station A, B bandwidth are identical, and base station A load is accounted for
It is 30% with situation, base station B load occupancy situation is 50%；Assuming that user is according to type of service
Two classes are segmented into, the business of 50% user belongs to real time business (the black round dot in Fig. 1),
Data rate is had higher requirements；The business of other 50% user belongs to non-real-time service (Fig. 1
In grey round dot), have higher tolerance to data rate and delay.In addition, as seen from Figure 1,
Because above-mentioned whole user geographical position are more neighbouring, for description for the sake of simplicity, assuming all to use
Large scale decline of the family from base station A and base station B is approximately the same.Simultaneously, it is assumed that base station A's
Vacant inadequate resource is to service whole real time business and non-real-time service user.That is,
If preferably base station A is used as the base station of oneself to whole users simultaneously, then certainly exist part use
Family can not obtain sufficient Radio Resource guarantee.
In the present invention, the function of setting selectance value (metric_value) is defined as：
Metric_value=α f1(CSI)-β·f2(load)-γ·f3(traffic) (1)
Wherein, f1(CSI) for characterize link-state information (Channel state information,
Be abbreviated as CSI) metric function, f2(load) it is the metric function of sign load of base station state,
f3(traffic) it is the metric function of sign customer service demand characteristic, α >=0, β >=0, γ >=0 is respectively
Link-state information, load of base station state, the weighted factor of customer service demand characteristic.Wherein,
Metric function f1,f2,f3Return to nonnegative value.From formula (1) as can be seen that above-mentioned selectance value
(metric_value) refer to believe with customer service demand characteristic, load of base station state and Link State
Cease the result of calculation of a certain function for variable.The function can reflect the influence of each parameter,
And the value will be used as the reference frame of serving cell or set of cells selection.
For the sake of only directly perceived, under aforementioned parameters setting, the present inventor assumes above-mentioned metric function
Parameter and function value it is as follows：α=β=γ=1, f2(load_BSA)=0.3, f3(load_BSB)=0.5,
f3(traffic=is real-time)=0.2, f3(traffic=is non real-time)=0.3, f1(CSI)=1.Further it is assumed that meeting most
The thresholding of the selectance value of low business transmission requirement is 0.2, i.e. for selectance value meter
Calculate base station of the result not less than 0.2 or collection of base stations can serve as the selection result of user.Separately
Outside, it is assumed that the select probability p=0.5 of user's selection secondary base station (can also be between 0~1
Other numerical value).
Under above-mentioned hypothesis, there is larger difference in the approximate consistent, load of base station of link-state information
When, if only considering CSI and load condition, according to the existing method introduced in background technology,
Above-mentioned intensive a large number of users can all select base station A as base station, and now base station A will face nothing
Instead the resource-constrained problem of line, certain customers can not obtain the service of satisfaction.But, if adopted
With proposed by the present invention while link-state information and load state information is considered, introduce and use
The influence of family business demand feature, then the discrepant user of type of service will make different
Selection.It is described as follows：
First, each user calculates the selectance value of oneself respectively according to above-mentioned formula (1).
According to above-mentioned it is assumed that for real-time traffic users, selection base station A selectance value is
metric_value(BSA)=1-0.3-0.2=0.5, selection base station B selectance value be：
metric_value(BSB)=1-0.5-0.2=0.3, so that, real-time traffic users make prioritizing selection base station A
For candidate base station.
For non-real-time service user, selection base station A selectance value is：
metric_value(BSA)=1-0.3-0.3=0.4, selection base station B selectance value be
metric_value(BSA)=1-0.5-0.3=0.2.Base station A is still the preferred base station of non-real-time service user,
But meanwhile, base station B can also meet the business transmission requirement of such user, and difference is to be：
Base station A is optimal for selectance value.
However, for non-real-time service user, it is contemplated that there is two kinds of selections of base station A and base station B
Business transmission requirement can be met simultaneously.Therefore, user can select base station according to Probability p=0.5
B is used as the base station of oneself.
Therefore, actual selection result is as follows:Real-time traffic users (in total number of users accounting
50%) selection base station A is used as candidate base station；And other non-real-time services user is (in total user
Middle accounting 50%) in, according to probability wherein half user using prioritizing selection base station B as base station,
And remaining half user still regard base station A as the base station of prioritizing selection.
It should be noted that user's selection base station B is in order at as base station in the above-described embodiments
The reason in terms of probability.But as a preferred embodiment for the above method, taken
It is engaged in completing after selectance magnitude calculation in cell selection procedure, can limit a part of user will make
Base station or collection of base stations for suboptimum result of calculation is as the selection result of oneself, rather than completely
Selected according to Optimal calculation result.Referred to herein as Optimal calculation result, refer to according to meter
Obtained selectance value so that the maximum base station of the selectance value or collection of base stations.It is secondary
Excellent result of calculation, refers to the selectance value obtained according to calculating, is transmitted substantially meeting user
With on the premise of business need (selectance value is embodied as more than predetermined thresholding), except
Other all feasible selection results outside Optimal calculation result.
The advantage of above-mentioned service cell selection method is：In user's close quarters, certain customers
It can actively select to meet business transmission requirement but not be the base station of optimal selection as candidate's base
Stand, on the one hand can so ensure the business transmission requirement of user, on the other hand also alleviate big
Measure user and concentrate possible congestion risk when selecting some or some light loaded base stations as base station.
In the second embodiment of the present invention, above-mentioned serving cell selection course is performed in user terminal,
Comprise the following steps that：
First, user measures the channel qualities of multiple Radio Links to obtain link-state information,
The corresponding load of base station state of Radio Link is received, and obtains the customer service demand characteristic of itself.
Above-mentioned customer service demand characteristic includes but is not limited to：The rate requirement of user, user
Grade instruction of delay requirement or customer service quality etc..Above-mentioned load of base station state include but
It is not limited to：Currently certain following a period of time is predicted in the load information of service user or base station for base station
Between estimation load information in section.Now, base station is needed by broadcast channel or control channel
Relevant parameter information is issued, the process can periodically or non-periodically be triggered.
Secondly, user is obtained after above-mentioned various information, and choosing is voluntarily calculated using above-mentioned formula (1)
Metric is selected, suitable one or more candidate service cells are selected according to result of calculation.
Then, user voluntarily can attempt to access the candidate service cell selected, can also be by
Selection result reports the base station of the service of offer, and the information then carried out by the base station between base station is handed over
Mutually.
It is high or only minority meets demand combinations for priority in above-mentioned second embodiment
User, selected with reference to Optimal calculation result；It is low or exist multiple full for priority
The user of sufficient demand combinations, a portion user is with probability parameter p (0≤p≤1) selections time
The base station of excellent result of calculation or collection of base stations are used as the base station of oneself.
Probability parameter p can be suitable for the system-level parameters of all users, so that this is general
Certain deformation (such as the probability levels quantified) of rate parameter or the probability parameter is used as configuration ginseng
Number is handed down to user by base station.The probability parameter can also be user class parameter, be utilized by user
Environment sensing or the equiprobable technology sets itself of empirical learning and optimization.Now, probability parameter p
P can be further represented asi, wherein i is corresponding user index.
In the third embodiment of the present invention, above-mentioned serving cell selection course can be in base station end
Perform, comprise the following steps that：
First, the link-state information for multiple Radio Links that reporting of user measurement is obtained is to place
Base station；Then, adjacent base station interacts respective load of base station state to base station；Finally, base
Stand according to the measurement result of user, the load information of adjacent base station and customer service demand characteristic,
Selectance value is calculated using above-mentioned formula (1)；And selected to be adapted to specific use according to result of calculation
The base station at family or collection of base stations, and selection result is interacted with adjacent base station.
It is pointed out that the entity for being responsible for information exchange management and metric calculation during this can
To be the current base station of the user or have some tool being connected with base station and adjacent base station
The management equipment of the standby function.
As a preferred embodiment for the above method, base station can be to all different business
Type of user calculates obtained selectance value and is ranked up, and with reference to ranking results, by part
User is dispatched to base station or the collection of base stations of suboptimum result of calculation.
Compared with prior art, customer center network service district selection provided by the present invention
Method has both sides technical characterstic：First, in serving cell selection criterion, except
Outside some link-state informations, base station load information, customer service demand characteristic is introduced, is utilized
The otherness of user performance characteristic carries out more fully cell and selected；Second, exist it is multiple can
When selecting base station combination, certain customers actively select or according to the base station of probability selection suboptimum result of calculation
Or base station combination, rather than Optimal calculation result base station or base station combination, so as to actively keep away
Open possible congestion results.Using the service cell selection method, in the field for facing intensive user
When scape or a large number of users may concurrently access the scene of same base, it can effectively alleviate money
Source congestion problems.
It should be noted that the above-mentioned method according to probability selection be applicable not only to it is provided by the present invention
Service cell selection method, be also applied in the prior art only with link signal quality or
The service cell selection method of junction link signal quality and load of base station state.
The customer center network service district that reduction provided by the present invention accesses congestion is selected above
Selection method is described in detail.For those of ordinary skill in the art, without departing substantially from
To any obvious change that it is done on the premise of true spirit, it will all constitute
To infringement of patent right of the present invention, corresponding legal liabilities will be undertaken.
Claims (10)
1. a kind of reduce the customer center network service district system of selection of access congestion, its feature exists
In：
User is entered when selecting serving cell using selectance value to adjacent multiple serving cells
Row is evaluated；
Based on the result of the evaluation, selected section user is small using the service of suboptimum result of calculation
Area.
2. customer center network service district as claimed in claim 1 system of selection, its feature
It is：
The selectance value is with customer service demand characteristic, load of base station state and link shape
State information is the result of calculation of the function of variable.
3. customer center network service district as claimed in claim 2 system of selection, its feature
It is：
The function is metric_value=α f1(CSI)-β·f2(load)-γ·f3(traffic)；
Wherein, metric_value is the selectance value, f1(CSI) it is sign link-state information
Metric function, f2(load) it is the metric function of sign load of base station state, f3(traffic) it is table
Take over the metric function of family business demand feature for use, α >=0, β >=0, γ >=0 is respectively Link State letter
Breath, load of base station state, the weighted factor of customer service demand characteristic.
4. customer center network service district as claimed in claim 2 system of selection, its feature
It is：
The customer service demand characteristic includes but is not limited to：The rate requirement of user, user
The grade of delay requirement or customer service quality is indicated.
5. customer center network service district as claimed in claim 2 system of selection, its feature
It is：
The load of base station state includes but is not limited to：The load of base station currently service user
Estimation load information in information or the following certain time period of base station prediction.
6. customer center network service district as claimed in claim 1 system of selection, its feature
It is：
The suboptimum result of calculation refers to the selectance value obtained according to calculating, is meeting user
On the premise of basic transmission and business need, other in addition to Optimal calculation result are all feasible
Selection result.
7. customer center network service district as claimed in claim 1 system of selection, its feature
It is to perform serving cell selection course in user terminal, comprises the following steps：
User measures the channel quality of multiple Radio Links to obtain link-state information, receives nothing
The corresponding load of base station state of wired link, and obtain the customer service demand characteristic of itself；
User is obtained after various information, calculates selectance value, selects suitable according to result of calculation
One or more candidate service cells.
8. customer center network service district as claimed in claim 1 system of selection, its feature
It is to perform serving cell selection course in base station end, comprises the following steps：
Base of the link-state information for multiple Radio Links that reporting of user measurement is obtained to place
Stand；
Adjacent base station interacts respective load of base station state to the base station；
The base station is according to the measurement result of user, the load information of adjacent base station and user's industry
Business demand characteristic, calculates selectance value；And selected to be adapted to specific user's according to result of calculation
Base station or collection of base stations, and selection result is interacted with adjacent base station.
9. customer center network service district as claimed in claim 1 system of selection, its feature
Be according to probability selection selected section user, wherein the probability parameter used be suitable for institute it is useful
The system-level parameters at family, user is handed down to by base station as configuration parameter.
10. customer center network service district as claimed in claim 1 system of selection, its feature
It is according to probability selection selected section user, wherein the probability parameter used is user class parameter,
Environment sensing or empirical learning sets itself and optimization are utilized by user.
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| CN201610126085.7A CN107155201A (en) | 2016-03-06 | 2016-03-06 | It is a kind of to reduce the customer center network service district system of selection of access congestion |
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|---|---|---|---|
| CN201610126085.7A CN107155201A (en) | 2016-03-06 | 2016-03-06 | It is a kind of to reduce the customer center network service district system of selection of access congestion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115334001A (en) * | 2022-10-18 | 2022-11-11 | 音信云(武汉)信息技术有限公司 | Data resource scheduling method and device based on priority relation |
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| CN104010315A (en) * | 2014-06-13 | 2014-08-27 | 北京理工大学 | Cell selection scheme based on user experience quality |
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| CN103988549A (en) * | 2011-10-17 | 2014-08-13 | 英特尔公司 | Call establishment in highly congested network environment |
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