CN106686668A - Selection method of voice fallback cell and apparatus thereof - Google Patents
Selection method of voice fallback cell and apparatus thereof Download PDFInfo
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- CN106686668A CN106686668A CN201510766026.1A CN201510766026A CN106686668A CN 106686668 A CN106686668 A CN 106686668A CN 201510766026 A CN201510766026 A CN 201510766026A CN 106686668 A CN106686668 A CN 106686668A
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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
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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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
- H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
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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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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Abstract
The invention relates to the safety protection field and discloses a selection method of a voice fallback cell and an apparatus thereof. The method comprises the following steps of taking a global mobile communication system GSM cell whose distance with a long-term evolution LTE cell is in a first scope as a candidate cell of LTE cell voice fallback; selecting a cell which has a mutual cofrequency interference relation with the candidate cell as an association cell of the candidate cell; according to a carrier number of the association cell of the candidate cell, and a number of same frequency points in the association cell of the candidate cell and the candidate cell, determining a cell quality index of the candidate cell; and according to the cell quality index of each candidate cell, selecting one candidate cell as a voice fallback cell of the LTE cell. In the prior art, during voice fallback, a terminal can not be guaranteed to occupy the cell with good GSM network quality so that 4G network conversation quality is influenced. In an embodiment of the invention, the above problem is solved.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of system of selection and the dress of voice fallback cell
Put.
Background technology
CSFB (circuit domain dropping, Circuit Switched Fallback) is 3GPP (third generation cooperation partners
With plan, 3rd Generation Partnership Project) definition a kind of voice solution, be to use
Ripe GSM (global system for mobile communications, Global System for Mobile Communication)
Network carrys out carry voice traffic, i.e., when user resides in LTE (Long Term Evolution, Long Term Evolution)
During network, when initiating speech business, GSM network can be fallen back to, voice industry is carried out on a gsm network
Business.Falling mechanism is the key factor for determining CSFB schemes performance and affecting user speech business experience.
The falling mechanism that at present existing network is used is mainly based upon RRC (wireless heterogeneous networks, the Radio of R8 versions
Resource Control) redirect.
In prior art, when terminal initiates speech business, network redirects terminal from 4G LTE networks
To 2G GSM networks, but terminal is redirected to which subdistrict frequency point of GSM network, is based on terminal-pair
The signal strength measurement of each frequency is selected.Network discharge 4G network connections while, meeting
The frequency list of GSM is issued, terminal selects one by measuring for the frequency in the frequency list
The most strong frequency of individual signal intensity, initiates access request and then reads 2G broadcast messages to carry out to 2G networks
It is synchronous, finally access 2G networks and complete CSFB fallings.Another way is that network does not issue any GSM
Frequency point information, according to the setting of mobile phone, voluntarily search rate scope, selects a signal intensity most strong to terminal
Frequency, to 2G networks initiate access request, then read 2G broadcast messages synchronize, be most followed by
Enter 2G networks and complete CSFB fallings.
Above-mentioned existing scheme is a kind of blind redirection scheme, and server is redirected to the net of GSM for terminal
The process of network is uncontrollable, although the frequency letter of GSM can be issued while 4G network connections are discharged
Breath, but in multiple GSM frequencies, it is impossible to distinguish frequency credit rating, it is impossible to select terminal to be redirected to
GSM frequencies, determined by the signal intensity of terminal measurement frequency point completely.But the signal intensity of frequency is stronger
The quality for not representing network is better.Therefore when terminal falls back to GSM network, it is impossible to ensure to take GSM
The measured cell of matter, have impact on the quality of 4G Internet phone-callings.
The content of the invention
The embodiment of the present invention provides a kind of system of selection of voice fallback cell and device, solves prior art
Cannot ensure that terminal takes GSM network matter measured cell during middle voice fallback, have impact on 4G networks and lead to
The problem of words quality.
The system of selection of voice fallback cell provided in an embodiment of the present invention includes：
By the global system for mobile communications with the distance between Long Term Evolution LTE cells in the range of first
Candidate cell of the GSM cell as the LTE cells voice fallback；
Choose cell the associating as the candidate cell that there is mutual co-channel interference relation with candidate cell
Cell；
According in the carrier number of the associated cell of the candidate cell, and the associated cell of the candidate cell
Frequency and the candidate cell in frequency identical number, the cell quality for determining the candidate cell refers to
Number；
According to the cell quality index of each candidate cell, select a candidate cell little as the LTE
The voice fallback cell in area.
Optionally, there is the cell of mutual co-channel interference relation as the candidate with candidate cell in the selection
The associated cell of cell, including：
The cell in the range of second with the distance of the candidate cell is obtained, as the neighbour of the candidate cell
Area；
Obtain the signal intensity of multiple sampled points of the adjacent area of the candidate cell；
Determine multiple sampled points in the signal intensity of the candidate cell and an adjacent area of the candidate cell
Signal intensity difference less than first threshold sampled point number, with all sampled point numbers in the adjacent area
Ratio；
If the ratio is more than Second Threshold, the adjacent area is exist mutually with frequently dry with the candidate cell
Disturb the cell of relation.
Optionally, the carrier number of the associated cell according to each candidate cell, and each candidate
The number of frequency identical with correspondence candidate cell, determines the cell of the candidate cell in the associated cell of cell
Performance figure, including：
According to the carrier number sum of all associated cells of the candidate cell, the little of the candidate cell is determined
Area's subcarrier index；
According to the frequency identical of the frequency of all associated cells of the candidate cell and the candidate cell
Number sum, determines the cell of the candidate cell with frequency index；
According to the cell carrier index and cell of the candidate cell with frequency index, the candidate cell is determined
Cell quality index.
Optionally, the cell quality index of the candidate cell meets following equation：
Cell quality index=a1× cell carrier index+a2× cell is with frequency index；
Wherein, a1For the weight coefficient of the cell carrier index, a2For the cell with frequency index weighting
Coefficient.
Optionally, the cell quality index according to each candidate cell, selects a candidate cell to make
For the voice fallback cell of the LTE cells, including：
According to the cell quality index of each candidate cell, all candidate cells are divided into into high priority
Candidate cell and low priority candidate cell；
Obtain the signal intensity of the main signal of each candidate cell；
The signal intensity of the main signal of each high priority candidate cell is contrasted with the first threshold value,
Choose the big high priority candidate cell of the first threshold value described in the signal intensity ratio of main signal；
The signal intensity of the main signal of each low priority candidate cell is contrasted with the second threshold value,
Choose the big low priority candidate cell of the second threshold value described in the signal intensity ratio of main signal；
The big high priority candidate cell of first thresholding described in signal intensity ratio from the main signal, with main letter
Number signal intensity ratio described among the big low priority candidate cell of the second thresholding, choose cell quality
Voice fallback cell of the minimum candidate cell of index as the LTE cells.
Optionally, the cell quality index of each candidate cell described in the basis, by all candidate cells
It is divided into high priority candidate cell and low priority candidate cell, including：
According to the cell quality index of the candidate cell, all candidate cells are carried out into ranking, wherein, it is little
The less candidate cell of area's performance figure, ranking is more forward；
Using N number of candidate cell in the top as the high priority candidate cell, by all candidate cells
In candidate cell in addition to the high priority candidate cell as the low priority candidate cell.
A kind of selecting device of voice fallback cell, including：
Candidate cell module, for by the GSM cell with the distance between LTE cells in the range of first
As the candidate cell of the LTE cells voice fallback；
, there is the cell of mutual co-channel interference relation as institute with candidate cell for choosing in associated cell module
State the associated cell of candidate cell；
Parameter determination module, for according to the carrier number of the associated cell of the candidate cell, and the time
The frequency identical number in frequency in the associated cell of cell and the candidate cell is selected, the time is determined
Select the cell quality index of cell；
Voice fallback module, for according to the cell quality index of each candidate cell, selecting a candidate
Voice fallback cell of the cell as the LTE cells.
Optionally, the associated cell module, is additionally operable to：
The cell in the range of second with the distance of the candidate cell is obtained, as the neighbour of the candidate cell
Area；
Obtain the signal intensity of multiple sampled points of the adjacent area of the candidate cell；
Determine multiple sampled points in the signal intensity of the candidate cell and an adjacent area of the candidate cell
Signal intensity difference less than first threshold sampled point number, with all sampled point numbers in the adjacent area
Ratio；
If the ratio is more than Second Threshold, the adjacent area is exist mutually with frequently dry with the candidate cell
Disturb the cell of relation.
Optionally, the parameter determination module, is additionally operable to：
According to the carrier number sum of all associated cells of the candidate cell, the little of the candidate cell is determined
Area's subcarrier index；
According to the frequency identical of the frequency of all associated cells of the candidate cell and the candidate cell
Number sum, determines the cell of the candidate cell with frequency index；
According to the cell carrier index and cell of the candidate cell with frequency index, the candidate cell is determined
Cell quality index.
Optionally, the cell quality index of the candidate cell meets following equation：
Cell quality index=a1× cell carrier index+a2× cell is with frequency index；
Wherein, a1For the weight coefficient of the cell carrier index, a2For the cell with frequency index weighting
Coefficient.
Optionally, the voice fallback module, is additionally operable to：
According to the cell quality index of each candidate cell, all candidate cells are divided into into high priority
Candidate cell and low priority candidate cell；
Obtain the signal intensity of the main signal of each candidate cell；
The signal intensity of the main signal of each high priority candidate cell is contrasted with the first threshold value,
Choose the big high priority candidate cell of the first threshold value described in the signal intensity ratio of main signal；
The signal intensity of the main signal of each low priority candidate cell is contrasted with the second threshold value,
Choose the big low priority candidate cell of the second threshold value described in the signal intensity ratio of main signal；
The big high priority candidate cell of first thresholding described in signal intensity ratio from the main signal, with main letter
Number signal intensity ratio described among the big low priority candidate cell of the second thresholding, choose cell quality
Voice fallback cell of the minimum candidate cell of index as the LTE cells.
Optionally, the voice fallback module, is additionally operable to：
According to the cell quality index of the candidate cell, all candidate cells are carried out into ranking, wherein, it is little
The less candidate cell of area's performance figure, ranking is more forward；
Using N number of candidate cell in the top as the high priority candidate cell, by all candidate cells
In candidate cell in addition to the high priority candidate cell as the low priority candidate cell.
When the embodiment of the present invention selects voice fallback cell, it is contemplated that peripheral cell is done by the same frequency for selecting cell
Disturb and affect.Using the GSM cell in the range of first as candidate cell, there is phase in selection with candidate cell
The associated cell of mutual co-channel interference, can be according to the carrier number of associated cell and with candidate cell identical frequently
Point, determines the performance figure of candidate cell, so as to quantify the GSM network quality of each candidate cell, can
To distinguish the network quality levels of each candidate cell, select the high candidate cell of network quality little as LTE
The voice fallback cell in area, it is ensured that the occupancy of the measured cell of terminal-pair GSM network matter, further protects
The voice call quality of 4G LTE networks is demonstrate,proved.
Description of the drawings
Technical scheme in order to be illustrated more clearly that the embodiment of the present invention, below will be to institute in embodiment description
The accompanying drawing that needs are used is briefly introduced, it should be apparent that, drawings in the following description are only the present invention's
Some embodiments, for one of ordinary skill in the art, in the premise for not paying creative labor
Under, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the flow chart of the system of selection of voice fallback cell in the embodiment of the present invention；
Fig. 2 is the schematic diagram of maximum fully associative cell set in the embodiment of the present invention；
Fig. 3 is the flow chart of the system of selection of another kind of voice fallback cell in the embodiment of the present invention；
Fig. 4 is the structure chart of the selecting device of voice fallback cell in the embodiment of the present invention.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing to this
It is bright to be described in further detail, it is clear that described embodiment is only present invention some embodiments,
Rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out all other embodiment obtained under the premise of creative work, belong to the scope of protection of the invention.
Existing CSFB voice fallbacks scheme is a kind of from 4G LTE networks to the blind heavy of 2G GSM networks
Orientation scheme, the subdistrict frequency point for finally falling back to is determined completely by terminal according to the signal intensity for measuring.
But very much not representation signal quality is good for signal intensity.Signal quality is quality of wireless network, by current assessment
Standard is divided into 0～7 totally 8 grades, wherein 0 grade preferably, 7 grades are worst.Quality of wireless network and carrier/interface ratio
Relevant, carrier/interface ratio as receives useful signal intensity and the ratio of interference signal intensity in signal, specifically maps
Relation such as table 1：
| Quality of wireless network grade | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Carrier/interface ratio (C/I) | 23 | 19 | 17 | 15 | 13 | 11 | 8 | 4 |
Table 1
Wherein, C is the intensity of useful signal, and I is the intensity of interference signal, and table 1 is quality of wireless network
The empirical value of grade and the corresponding relation of carrier/interface ratio.As can be seen from Table 1, the value of C/I is bigger, wireless network
Network quality is better, therefore the intensity of useful signal is stronger, and the intensity of interference signal is weaker, and quality of wireless network is got over
It is good.Therefore, the communication quality of a subdistrict frequency point is weighed, the intensity for receiving signal is not only considered, also
Consider the interference that other cells are produced to the cell.
Based on this, a kind of system of selection of voice fallback cell, the stream of the method are embodiments provided
Journey is as shown in figure 1, method may include steps of：
S101, by the global mobile communication system with the distance between Long Term Evolution LTE cells in the range of first
Candidate cell of the system GSM cell as the LTE cells voice fallback；
There is the cell of mutual co-channel interference relation as the candidate cell with candidate cell in S102, selection
Associated cell；
S103, according to the carrier number of the associated cell of the candidate cell, and the association of the candidate cell
Frequency identical number in frequency in cell and the candidate cell, determines the cell of the candidate cell
Performance figure；
S104, according to the cell quality index of each candidate cell, select a candidate cell as described
The voice fallback cell of LTE cells.
In the embodiment of the present invention, when selecting voice fallback cell, measurement will be also included to the interference of subdistrict frequency point
Standard, the GSM cell in the range of first is existed mutually together as candidate cell, selection and candidate cell
The associated cell of frequency interference.Wherein, the first scope for choosing candidate cell is usually according to the distance between base station
It is determined that, can be 2～3 times of base station distance.The first scope value under different scenes is different, such as, intensive
City can value be 200m～300m, small towns can value be 500～600m, rural area can value be
700m～1000m.
According to the carrier number of associated cell and with candidate cell identical frequency, determine the quality of candidate cell
Index, so as to quantify the GSM network quality of each candidate cell, can distinguish the net of each candidate cell
Network credit rating, selects the high candidate cell of network quality as the voice fallback cell of LTE cells, it is ensured that
The occupancy of the measured cell of terminal-pair GSM network matter, further ensures the voice of 4G LTE networks
Speech quality.
Interference in cell mostlys come from adjacent cell, and the adjacent cell of cell is more, and cell is little with neighbouring
The signal in area is more close, then the cell intensity that is interfered is bigger.In the adjacent cell of candidate cell, with
There is the associated cell that the cell of mutual co-channel interference relation is the candidate cell in candidate cell.Two cells A
There is mutual co-channel interference relation, i.e. A cells and B between there is with frequency restriction effect B cells, and
B cells have with frequency restriction effect to A cells, that is, A cells and B cells are mutually associated cell.
Interfering between associated cell is more serious, therefore, the embodiment of the present invention mainly considers candidate cell
Interference of the associated cell to the candidate cell.
Preferably, the associated cell of candidate cell can in the following manner be determined, including：
The cell in the range of second with the distance of the candidate cell is obtained, as the neighbour of the candidate cell
Area；
Obtain the signal intensity of multiple sampled points of the adjacent area of the candidate cell；
Determine multiple sampled points in the signal intensity of the candidate cell and an adjacent area of the candidate cell
Signal intensity difference less than first threshold sampled point number, with all sampled point numbers in the adjacent area
Ratio；
If the ratio is more than Second Threshold, the adjacent area is exist mutually with frequently dry with the candidate cell
Disturb the cell of relation.
The embodiment of the present invention selectes a range of cell of GSM candidate cell peripheries as to candidate cell
It is likely to result in the adjacent area of co-channel interference.The signal that the multiple sampled points in adjacent area are obtained from the measurement report of adjacent area is strong
Degree, calculates the difference of the signal intensity of candidate cell and the signal intensity of these sampled points.By difference less than the
The number of the sampled point of one threshold value, is divided by with the number of all sampled points in the adjacent area, and will be divided by the ratio that obtains
Compare with Second Threshold again, ratio exists dry mutually with frequency more than the adjacent area of Second Threshold with candidate cell
Disturb.That is, in the data measured in adjacent area, signal intensity is close with the signal intensity of candidate cell
Large percentage, then it is assumed that the cell is the associated cell of candidate cell.
Optionally, on the basis of all associated cells of candidate cell, may be incorporated into maximum fully associative cell
The concept of collection.If being associated cell in set of cells ψ between arbitrary cells, and there is no other association
Cell set φ so that set of cells ψ belongs to φ, then set of cells ψ is maximum fully associative cell set.Such as
Shown in Fig. 2, cell A, B, C and D are maximum fully associative cell set in figure.Step S103～S104
In associated cell can also be limited to the associating in same maximum fully associative cell set with candidate cell
Cell.
Wireless frequency spectrum in mobile communications network is limited, needs by the way of with frequency multiplexing cellular cell networking
User to provide in Mobile Communication Service, that is, cell separated by a distance can use identical frequency
Rate, so as to greatly improve spectrum efficiency, but cost is the introduction of interference signal I.In the embodiment of the present invention
In, i.e., candidate cell can use identical frequency with the user in the associated cell of the candidate cell.Assume
The covering radius of all base stations is identical, and the covering radius of candidate cell is R, and frequency reuse distance is D.It is multiple
Meet following relationship between D, radius of society R, the cell number N of each channeling cluster：
... ... ... ... ... ... ... formula 1
Q is co-channel interference decay factor in above formula, and 3N is frequency reuse, for directional cell, N
Actual physical meaning be channeling cluster in number of base stations.Frequency reuse meets following relationship again：
Carrier number sum ... the formula 2 of frequency reuse=available sum frequency number/all associated cells
If associated cell works with candidate cell simultaneously, the mobile phone in core candidate cell had both received this
The useful signal of cell base station transmitting, receives the interference signal of associated cell again.So candidate cell edge
Minimum same frequency carrier/interface ratio (C/I) is represented by：
... ... ... ... ... formula 3
Wherein γ is the propagation path loss index determined by landform.
The carrier/interface ratio of candidate cell and the carrier number sum of all associated cells are can be seen that according to formula 1～3
Carrier number sum for all associated cells of inverse relation, i.e. candidate cell is bigger, then the load of candidate cell
It is dry than less, so as to the quality of wireless network of candidate cell is poorer.Therefore, it can the institute according to candidate cell
The carrier number sum of relevant cell, determines the cell quality index of candidate cell.
On the other hand, it will be apparent that, the associated cell of candidate cell is got over the candidate cell using identical frequency
Many, then the interference to candidate cell is bigger.
It is preferred, therefore, that the carrier number of each associated cell according to candidate cell, and candidate cell
Each associated cell in number with the correspondence identical frequency of candidate cell, determine the little of the candidate cell
Area's performance figure, i.e. step S103 include：
According to the carrier number sum of all associated cells of the candidate cell, the little of the candidate cell is determined
Area's subcarrier index；
According to the frequency identical of the frequency of all associated cells of the candidate cell and the candidate cell
Number sum, determines the cell of the candidate cell with frequency index；
According to the cell carrier index and cell of the candidate cell with frequency index, the candidate cell is determined
Cell quality index.
Specifically, the cell carrier of candidate cell can be determined after the associated cell of candidate cell determines
Index and cell with frequency index, wherein, cell carrier index for candidate cell all associated cells carrier wave
Number sum, cell is the frequency of all associated cells of candidate cell and the frequency of the candidate cell with frequency index
Point identical number sum.
Such as, it is respectively cell A, cell B and cell C if candidate cell D has three associated cells,
Candidate cell has 6 frequencies；Cell A has 8 frequencies, wherein 2 frequencies are shared with candidate cell；
Cell B has 5 frequencies, wherein have 1 frequency to be shared with candidate cell；Cell C has 9 frequencies
Point, wherein have 2 frequencies to be shared with candidate cell.Due to the frequency number and carrier number of cell it is equal,
Then the cell carrier index of the candidate cell is 8+5+9=22, and cell is 2+1+2=5 with frequency index.
Further, it is possible to set up cell respectively with frequency index according to the cell carrier index and cell of candidate cell
The assessment table of quality of wireless network, as shown in table 2 and table 3：
| Cell carrier index | Quality of wireless network grade |
| 0-20 | 0 |
| 21-40 | 1 |
| 41-60 | 2 |
| 61-80 | 3 |
| 81-100 | 4 |
| 101-150 | 5 |
| >150 | 6 |
Table 2
| Cell is with frequency index | Quality of wireless network grade |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| >6 | 6 |
Table 3
By table 2 and table 3 as can be seen that cell carrier index and cell with frequency index with the wireless network of cell
Network credit rating is inversely proportional to, i.e. cell carrier index is bigger, and the quality of wireless network of cell is poorer, and cell is same
Frequency index is bigger, and the quality of wireless network of cell is poorer.If individually according to cell carrier index, candidate is little
The quality of wireless network grade of area D is 1；If individually according to cell with frequency index, the nothing of candidate cell D
Line network quality levels are 4.Therefore, a value need to be determined with frequency index according to cell carrier index and cell,
That is cell quality index, as the standard for judging cell-radio network quality.
Therefore, the cell quality index of candidate cell meets following equation：
Cell quality index=a1× cell carrier index+a2× cell is with frequency index ... ... ... formula 4
Wherein, a1For the weight coefficient of the cell carrier index, a2For the cell with frequency index weighting
Coefficient.In view of with the frequency influence degree different to cell signal from adjacent frequency, a1Can value be 20%～30%,
a2Can value be 70%～80%, and a1+a2=100%.
After determining the cell quality index of candidate cell of LTE cell voice fallbacks, still need to according to each candidate
The signal intensity of cell is selecting final voice fallback cell.For the ease of comparing, can be according to cell matter
Candidate cell is divided into high priority candidate cell and low priority candidate cell by volume index, then for difference
Priority determine the threshold value of signal intensity.Preferably, step S104 includes：
According to the cell quality index of each candidate cell, all candidate cells are divided into into high priority
Candidate cell and low priority candidate cell；
Obtain the signal intensity of the main signal of each candidate cell；
The signal intensity of the main signal of each high priority candidate cell is contrasted with the first threshold value,
Choose the big high priority candidate cell of the first threshold value described in the signal intensity ratio of main signal；
The signal intensity of the main signal of each low priority candidate cell is contrasted with the second threshold value,
Choose the big low priority candidate cell of the second threshold value described in the signal intensity ratio of main signal；
The big high priority candidate cell of first thresholding described in signal intensity ratio from the main signal, with main letter
Number signal intensity ratio described among the big low priority candidate cell of the second thresholding, choose cell quality
Voice fallback cell of the minimum candidate cell of index as the LTE cells.
Specifically, the less candidate cell of cell quality index is set as into high priority, cell quality is referred to
The larger candidate cell of number is set as low priority.Can by the first threshold value of high priority candidate cell with
Second threshold settings of low priority candidate cell are same value, or both are set as into different value.Preferably
Ground, the first threshold value of high priority candidate cell can be slightly below the second thresholding of low priority candidate cell
Value, because the interference that high priority candidate cell is received is less, therefore can reduce to a certain extent to letter
The requirement of number intensity.Such as, can be -100dBm by the first threshold settings of high priority candidate cell,
It is -90dBm by the second threshold settings of low priority candidate cell.From all high priority candidate cells
Select-out signal intensity more than the first threshold value cell, it is strong from select-out signal in all low priority candidate cells
Spend the cell more than the second threshold value, then again using the minimum candidate cell of wherein cell quality index as
The voice fallback cell of LTE cells.
Wherein, all candidate cells are divided into into high priority candidate cell and low priority candidate cell, including：
According to the cell quality index of the candidate cell, all candidate cells are carried out into ranking, wherein, it is little
The less candidate cell of area's performance figure, ranking is more forward；
Using N number of candidate cell in the top as the high priority candidate cell, by all candidate cells
In candidate cell in addition to the high priority candidate cell as the low priority candidate cell.
In order to be more clearly understood that the present invention, below above-mentioned flow process is described in detail with instantiation.Should
Flow process described by instantiation is as shown in figure 3, may comprise steps of：
S201, server obtain the measurement statistical data of base station and user terminal.It is main in measurement statistical data
It is sample signal strength including the sampled level value of each cell.
S202, each the maximum fully associative cell set for generating the whole network.For each cell, the cell is determined
Associated cell, can be set as 12dB by first threshold, and Second Threshold is set as into 1%, the i.e. cell
Sampled point of the difference of the signal intensity of multiple sampled points less than 12dB is individual in signal intensity and one adjacent area
Number, with the ratio of all sampled point numbers in the adjacent area 1% is more than, then the adjacent area is and the candidate cell
There is the cell of mutual co-channel interference relation, the as associated cell of this cell.Based on same frequency each other
Interference relationships, obtain all maximum fully associative cell set in whole region.
S203, using each cell as Target cell, calculate the cell quality index of Target cell.According to mesh
Associated cell of the mark cell in maximum fully associative cell set, according to formula 4 the cell matter of Target cell is calculated
Volume index.
S204, when LTE terminal initiate speech business when, server selectes the end for needing to carry out voice fallback
The candidate cell of end place LTE cells.Institute centered on LTE cells, in the range of detection range 300m
There is GSM cell, as the candidate cell of LTE cells.
S205, it is that all candidate cells distribute priority according to cell quality index, and signal intensity is set
First thresholding and the second thresholding.All candidate cells are carried out into ranking by cell quality index, it is in the top
5 candidate cells are set to high priority, the first thresholding of setting is -100dBm, remaining to rank behind
Candidate cell is set to low priority, and the second thresholding of setting is -90dBm.
S206, server set up the cell information list of candidate cell, and are handed down to and need to carry out voice fallback
Terminal, in cell information list can include each candidate cell main frequency point information, priority indication, letter
Number strength threshold.
S207, terminal read the cell information of all of candidate cell, select voice fallback cell.Terminal is pressed
Arrange according to the priority of candidate cell, the signal intensity of preferential measurement high priority candidate cell, and with first
Limit compares, if the signal intensity of high priority candidate cell is more than the first thresholding, chooses high priority candidate
Cell is used as voice fallback cell；If the signal intensity of high priority candidate cell is not more than the first thresholding, then
The signal intensity of measurement low priority candidate cell, and compare with the second thresholding；If in cell information list
Candidate cell is unsatisfactory for condition, then terminal falls after rise from the other subdistrict frequency points of line search.
Based on identical technology design, the embodiment of the present invention also provides a kind of selection dress of voice fallback cell
Put, as shown in figure 4, including：
Candidate cell module 1, for the GSM with the distance between LTE cells in the range of first is little
Candidate cell of the area as the LTE cells voice fallback；
Associated cell module 2, for choosing the cell conduct that there is mutual co-channel interference relation with candidate cell
The associated cell of the candidate cell；
Parameter determination module 3, for according to the carrier number of the associated cell of the candidate cell and described
Frequency identical number in frequency in the associated cell of candidate cell and the candidate cell, it is determined that described
The cell quality index of candidate cell；
Voice fallback module 4, for according to the cell quality index of each candidate cell, selecting a time
Cell is selected as the voice fallback cell of the LTE cells.
The associated cell module 2, is additionally operable to：
The cell in the range of second with the distance of the candidate cell is obtained, as the neighbour of the candidate cell
Area；
Obtain the signal intensity of multiple sampled points of the adjacent area of the candidate cell；
Determine multiple sampled points in the signal intensity of the candidate cell and an adjacent area of the candidate cell
Signal intensity difference less than first threshold sampled point number, with all sampled point numbers in the adjacent area
Ratio；
If the ratio is more than Second Threshold, the adjacent area is exist mutually with frequently dry with the candidate cell
Disturb the cell of relation.
The parameter determination module 3, is additionally operable to：
According to the carrier number sum of all associated cells of the candidate cell, the little of the candidate cell is determined
Area's subcarrier index；
According to the frequency identical of the frequency of all associated cells of the candidate cell and the candidate cell
Number sum, determines the cell of the candidate cell with frequency index；
According to the cell carrier index and cell of the candidate cell with frequency index, the candidate cell is determined
Cell quality index.
The cell quality index of the candidate cell meets following equation：
Cell quality index=a1× cell carrier index+a2× cell is with frequency index；
Wherein, a1For the weight coefficient of the cell carrier index, a2For the cell with frequency index weighting
Coefficient.
The voice fallback module 4, is additionally operable to：
According to the cell quality index of each candidate cell, all candidate cells are divided into into high priority
Candidate cell and low priority candidate cell；
Obtain the signal intensity of the main signal of each candidate cell；
The signal intensity of the main signal of each high priority candidate cell is contrasted with the first threshold value,
Choose the big high priority candidate cell of the first threshold value described in the signal intensity ratio of main signal；
The signal intensity of the main signal of each low priority candidate cell is contrasted with the second threshold value,
Choose the big low priority candidate cell of the second threshold value described in the signal intensity ratio of main signal；
The big high priority candidate cell of first thresholding described in signal intensity ratio from the main signal, with main letter
Number signal intensity ratio described among the big low priority candidate cell of the second thresholding, choose cell quality
Voice fallback cell of the minimum candidate cell of index as the LTE cells.
The voice fallback module 4, is additionally operable to：
According to the cell quality index of the candidate cell, all candidate cells are carried out into ranking, wherein, it is little
The less candidate cell of area's performance figure, ranking is more forward；
Using N number of candidate cell in the top as the high priority candidate cell, by all candidate cells
In candidate cell in addition to the high priority candidate cell as the low priority candidate cell.
The present invention is produced with reference to method according to embodiments of the present invention, equipment (system) and computer program
The flow chart and/or block diagram of product is describing.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or square frame and flow chart and/or the flow process in block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedded
The processor of formula datatron or other programmable data processing devices is producing a machine so that by calculating
The instruction of the computing device of machine or other programmable data processing devices is produced for realizing in flow chart one
The device of the function of specifying in individual flow process or one square frame of multiple flow processs and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in can guide computer or other programmable datas process to set
In the standby computer-readable memory for working in a specific way so that in being stored in the computer-readable memory
Instruction produce and include the manufacture of command device, command device realization is in one flow process or multiple of flow chart
The function of specifying in one square frame of flow process and/or block diagram or multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing devices, made
Obtain and series of operation steps is performed on computer or other programmable devices to produce computer implemented place
Reason, so as to the instruction performed on computer or other programmable devices is provided for realizing in flow chart one
The step of function of specifying in flow process or one square frame of multiple flow processs and/or block diagram or multiple square frames.
, but those skilled in the art once know base although preferred embodiments of the present invention have been described
This creative concept, then can make other change and modification to these embodiments.So, appended right will
Ask and be intended to be construed to include preferred embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these modification and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprising these changes and modification.
Claims (12)
1. a kind of system of selection of voice fallback cell, it is characterised in that include：
By the global system for mobile communications with the distance between Long Term Evolution LTE cells in the range of first
Candidate cell of the GSM cell as the LTE cells voice fallback；
Choose cell the associating as the candidate cell that there is mutual co-channel interference relation with candidate cell
Cell；
According in the carrier number of the associated cell of the candidate cell, and the associated cell of the candidate cell
Frequency and the candidate cell in frequency identical number, the cell quality for determining the candidate cell refers to
Number；
According to the cell quality index of each candidate cell, select a candidate cell little as the LTE
The voice fallback cell in area.
2. the method for claim 1, it is characterised in that the selection has phase with candidate cell
Mutually the cell of co-channel interference relation as the candidate cell associated cell, including：
The cell in the range of second with the distance of the candidate cell is obtained, as the neighbour of the candidate cell
Area；
Obtain the signal intensity of multiple sampled points of the adjacent area of the candidate cell；
Determine multiple sampled points in the signal intensity of the candidate cell and an adjacent area of the candidate cell
Signal intensity difference less than first threshold sampled point number, with all sampled point numbers in the adjacent area
Ratio；
If the ratio is more than Second Threshold, the adjacent area is exist mutually with frequently dry with the candidate cell
Disturb the cell of relation.
3. the method for claim 1, it is characterised in that described according to each candidate cell
The carrier number of associated cell, and in the associated cell of each candidate cell with corresponding candidate cell same frequency
The number of point, determines the cell quality index of the candidate cell, including：
According to the carrier number sum of all associated cells of the candidate cell, the little of the candidate cell is determined
Area's subcarrier index；
According to the frequency identical of the frequency of all associated cells of the candidate cell and the candidate cell
Number sum, determines the cell of the candidate cell with frequency index；
According to the cell carrier index and cell of the candidate cell with frequency index, the candidate cell is determined
Cell quality index.
4. method as claimed in claim 3, it is characterised in that the cell quality of the candidate cell refers to
Number meets following equation：
Cell quality index=a1× cell carrier index+a2× cell is with frequency index；
Wherein, a1For the weight coefficient of the cell carrier index, a2For the cell with frequency index weighting
Coefficient.
5. the method for claim 1, it is characterised in that described according to each candidate cell
Cell quality index, select a candidate cell as the LTE cells voice fallback cell, including：
According to the cell quality index of each candidate cell, all candidate cells are divided into into high priority
Candidate cell and low priority candidate cell；
Obtain the signal intensity of the main signal of each candidate cell；
The signal intensity of the main signal of each high priority candidate cell is contrasted with the first threshold value,
Choose the big high priority candidate cell of the first threshold value described in the signal intensity ratio of main signal；
The signal intensity of the main signal of each low priority candidate cell is contrasted with the second threshold value,
Choose the big low priority candidate cell of the second threshold value described in the signal intensity ratio of main signal；
The big high priority candidate cell of first thresholding described in signal intensity ratio from the main signal, with main letter
Number signal intensity ratio described among the big low priority candidate cell of the second thresholding, choose cell quality
Voice fallback cell of the minimum candidate cell of index as the LTE cells.
6. method as claimed in claim 5, it is characterised in that each candidate is little described in the basis
All candidate cells are divided into high priority candidate cell and low priority candidate are little by the cell quality index in area
Area, including：
According to the cell quality index of the candidate cell, all candidate cells are carried out into ranking, wherein, it is little
The less candidate cell of area's performance figure, ranking is more forward；
Using N number of candidate cell in the top as the high priority candidate cell, by all candidate cells
In candidate cell in addition to the high priority candidate cell as the low priority candidate cell.
7. a kind of selecting device of voice fallback cell, it is characterised in that include：
Candidate cell module, for by the GSM cell with the distance between LTE cells in the range of first
As the candidate cell of the LTE cells voice fallback；
, there is the cell of mutual co-channel interference relation as institute with candidate cell for choosing in associated cell module
State the associated cell of candidate cell；
Parameter determination module, for according to the carrier number of the associated cell of the candidate cell, and the time
The frequency identical number in frequency in the associated cell of cell and the candidate cell is selected, the time is determined
Select the cell quality index of cell；
Voice fallback module, for according to the cell quality index of each candidate cell, selecting a candidate
Voice fallback cell of the cell as the LTE cells.
8. device as claimed in claim 7, it is characterised in that the associated cell module, is additionally operable to：
The cell in the range of second with the distance of the candidate cell is obtained, as the neighbour of the candidate cell
Area；
Obtain the signal intensity of multiple sampled points of the adjacent area of the candidate cell；
Determine multiple sampled points in the signal intensity of the candidate cell and an adjacent area of the candidate cell
Signal intensity difference less than first threshold sampled point number, with all sampled point numbers in the adjacent area
Ratio；
If the ratio is more than Second Threshold, the adjacent area is exist mutually with frequently dry with the candidate cell
Disturb the cell of relation.
9. device as claimed in claim 7, it is characterised in that the parameter determination module, is additionally operable to：
According to the carrier number sum of all associated cells of the candidate cell, the little of the candidate cell is determined
Area's subcarrier index；
According to the frequency identical of the frequency of all associated cells of the candidate cell and the candidate cell
Number sum, determines the cell of the candidate cell with frequency index；
According to the cell carrier index and cell of the candidate cell with frequency index, the candidate cell is determined
Cell quality index.
10. device as claimed in claim 9, it is characterised in that the cell quality of the candidate cell refers to
Number meets following equation：
Cell quality index=a1× cell carrier index+a2× cell is with frequency index；
Wherein, a1For the weight coefficient of the cell carrier index, a2For the cell with frequency index weighting
Coefficient.
11. devices as claimed in claim 7, it is characterised in that the voice fallback module, are additionally operable to：
According to the cell quality index of each candidate cell, all candidate cells are divided into into high priority
Candidate cell and low priority candidate cell；
Obtain the signal intensity of the main signal of each candidate cell；
The signal intensity of the main signal of each high priority candidate cell is contrasted with the first threshold value,
Choose the big high priority candidate cell of the first threshold value described in the signal intensity ratio of main signal；
The signal intensity of the main signal of each low priority candidate cell is contrasted with the second threshold value,
Choose the big low priority candidate cell of the second threshold value described in the signal intensity ratio of main signal；
The big high priority candidate cell of first thresholding described in signal intensity ratio from the main signal, with main letter
Number signal intensity ratio described among the big low priority candidate cell of the second thresholding, choose cell quality
Voice fallback cell of the minimum candidate cell of index as the LTE cells.
12. devices as claimed in claim 11, it is characterised in that the voice fallback module, also use
In：
According to the cell quality index of the candidate cell, all candidate cells are carried out into ranking, wherein, it is little
The less candidate cell of area's performance figure, ranking is more forward；
Using N number of candidate cell in the top as the high priority candidate cell, by all candidate cells
In candidate cell in addition to the high priority candidate cell as the low priority candidate cell.
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| CN109495934A (en) * | 2017-09-12 | 2019-03-19 | 中兴通讯股份有限公司 | A kind of method of call conversation, relevant device and storage medium |
| WO2019061425A1 (en) * | 2017-09-30 | 2019-04-04 | 深圳市云中飞网络科技有限公司 | Csfb result detection method and device, and computer storage medium |
| CN109792661A (en) * | 2017-09-30 | 2019-05-21 | 深圳市云中飞网络科技有限公司 | A kind of falling result detection method and device, the computer storage medium of CSFB |
| CN113950114A (en) * | 2021-10-21 | 2022-01-18 | 中国联合网络通信集团有限公司 | Blind redirection fallback method, base station, terminal and network system |
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| CN109495934A (en) * | 2017-09-12 | 2019-03-19 | 中兴通讯股份有限公司 | A kind of method of call conversation, relevant device and storage medium |
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