CN108076489A - A kind of method and device of cell selection - Google Patents
A kind of method and device of cell selection Download PDFInfo
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- CN108076489A CN108076489A CN201611009443.2A CN201611009443A CN108076489A CN 108076489 A CN108076489 A CN 108076489A CN 201611009443 A CN201611009443 A CN 201611009443A CN 108076489 A CN108076489 A CN 108076489A
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- Prior art keywords
- noise ratio
- signal
- cell
- persistent district
- decision threshold
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The present invention provides a kind of method and devices of cell selection, it is weak by the intensity for being directed to wireless network signal, that is the reception power of the reference signal of persistent district is unsatisfactory for the situation of the first decision threshold, whether default triggering decision threshold is reached by the signal-to-noise ratio of persistent district again, to determine the size of the interference of the persistent district, it is if eligible, then it is assumed that user equipment still can obtain higher transmission rate in the persistent district, can guarantee conventional data transmission.To increase time of the user equipment in current persistent district, the utilization rate of persistent district is promoted.The described method includes：When the reception power of the reference signal of persistent district is not up to default first decision threshold, determine whether the signal-to-noise ratio of the persistent district reaches default triggering decision threshold；If so, continue to reside in the persistent district；Otherwise, other cells will be switched to.
Description
Technical field
The present invention relates to the method and devices that field of communication technology more particularly to a kind of cell select.
Background technology
In TDD-LTE (Time Division Long Term Evolution, timesharing Long Term Evolution) network, it is used for
The intensity of wireless signal and the key parameter of quality are represented, including：RSRP(Reference Signal Receiving
Power, Reference Signal Received Power) and SINR (Signal to Interference plus Noise Ratio, signal with
Interference plus noise ratio).Wherein, RSRP refers to carry the reception power on the resource element of reference signal in measurement frequency bandwidth
Linear average, for characterizing the intensity of wireless network signal；SINR refers to the intensity for the useful signal that user equipment receives
Ratio with the intensity of interference signal received, for characterizing the quality of wireless network signal.
User equipment is resided in TDD-LTD wireless networks, and user equipment at this stage will be resident small according to what is received
The RSRP in area is compared with the decision threshold of active wireless network, if the RSRP of persistent district is more than sentencing for active wireless network
Certainly thresholding, then the user's equipment may reside in LTE wireless networks, otherwise, user equipment will be considered to the ring of the wireless network
Border is not suitable for being resident, and will be switched to different system cell.However, in some interference very littles, but the intensity RSRP of wireless network signal
In the environment of very low wireless network, user equipment still can obtain higher transmission rate.However it is selected according to above-mentioned cell
Selection method, the network environment will be ignored.
In conclusion how to promote the resident ratio of LTE wireless networks, increase the area coverage of LTE wireless networks.
The content of the invention
An embodiment of the present invention provides a kind of method and devices of cell selection, are resident to increase user equipment currently
The time of cell promotes the utilization rate of persistent district.
A kind of method of cell selection provided in an embodiment of the present invention, including：
When the reception power of the reference signal of persistent district is not up to default first decision threshold, determine described resident
Whether the signal-to-noise ratio of cell reaches default triggering decision threshold；
If so, continue to reside in the persistent district；Otherwise, other cells will be switched to.
It is weak for the intensity of wireless network signal in the embodiment of the present invention, i.e. the reception work(of the reference signal of persistent district
Rate is unsatisfactory for the situation of the first decision threshold, then whether reaches default triggering decision threshold by the signal-to-noise ratio of persistent district,
The size of the interference of the persistent district is determined, if eligible, then it is assumed that user equipment still can be obtained in the persistent district
Higher transmission rate is obtained, can guarantee conventional data transmission.By scheme provided in an embodiment of the present invention, in the resource of existing net
Under the premise of immovable so that time of the user equipment in current persistent district increases, and improves the utilization rate of persistent district.
It is preferred that determine whether the signal-to-noise ratio of the persistent district reaches default triggering decision threshold, including：
Determine whether signal-to-noise ratio of the persistent district in preset time section reaches default triggering decision threshold.
It is preferred that the preset time section includes：Multiple sub- time intervals；
It determines whether the signal-to-noise ratio in the persistent district preset time section reaches default triggering decision threshold, wraps
It includes：
Add up to the signal-to-noise ratio in each sub- time interval averaging, determines the corresponding average noise of each sub- time interval
Than；
Determine whether that the corresponding average signal-to-noise ratio of each sub- time interval reaches default triggering decision threshold.
In the embodiment of the present invention, by determining the average signal-to-noise ratio in sub- time interval, compare average signal-to-noise ratio with presetting
Triggering decision threshold size, so as to reduce number of comparisons, improve efficiency.
It is preferred that the reception power of the reference signal of persistent district is not up to default first decision threshold, including：
If user equipment is the user equipment that multimode list is treated, the reference signal for the cell that the user equipment is resident connects
It receives power and is less than or equal to different system cell selection InterRAT interoperability level thresholds；
If user equipment is the user equipment of multi-mode and multi-standby, the reference signal for the cell that the user equipment is resident connects
Receive the minimum access level that power is less than or equal to the cell that the user equipment is resident.
It is preferred that when the reception power of the reference signal of persistent district is not up to default first decision threshold, true
Before whether the signal-to-noise ratio of the fixed persistent district reaches default triggering decision threshold, this method further includes：
Judge whether uplink transmission power is more than or equal to default path loss thresholding, if so, determining described resident small
Whether the signal-to-noise ratio in area reaches default triggering decision threshold, otherwise, switches to other cells.
It is preferred that other cells will be switched to, including：
If user equipment is located at the overlapping region of at least two peripheral cells covering, and the reference signal of the peripheral cell
Reception power be less than or equal to default second decision threshold, then according to the peripheral cell in the preset time section
Signal-to-noise ratio, obtain average signal-to-noise ratio；
Compare the average signal-to-noise ratio of the peripheral cell, it is small to switch to determine the maximum corresponding cell of average signal-to-noise ratio
Area；
The user equipment is switched into the switching cell.
In the embodiment of the present invention, if user equipment there are other weak cells of multiple signal strengths, by comparing unit
Average signal-to-noise ratio in time determines optimal switching cell.
It is preferred that after determining the maximum corresponding cell of average signal-to-noise ratio for switching cell, this method further includes：
Reduce the average signal-to-noise ratio of the peripheral cell to default for avoiding the numerical value of frequent switching cell.
It is preferred that other described cells include：Different system cell.
A kind of device of cell selection provided in an embodiment of the present invention, including：
Comparison module, the reception power for working as the reference signal of persistent district are not up to default first decision threshold
When, determine whether the signal-to-noise ratio of the persistent district reaches default triggering decision threshold；
Processing module, for if so, continuing to reside in the persistent district；Otherwise, other cells will be switched to.
It is weak for the intensity of wireless network signal in the embodiment of the present invention, i.e. the reception work(of the reference signal of persistent district
Rate is unsatisfactory for the situation of the first decision threshold, then whether reaches default triggering decision threshold by the signal-to-noise ratio of persistent district,
The size of the interference of the persistent district is determined, if eligible, then it is assumed that user equipment still can be obtained in the persistent district
Higher transmission rate is obtained, can guarantee conventional data transmission.By scheme provided in an embodiment of the present invention, in the resource of existing net
Under the premise of immovable so that time of the user equipment in current persistent district increases, and improves the utilization rate of persistent district.
It is preferred that determining whether the signal-to-noise ratio of the persistent district reaches default triggering decision threshold, the relatively mould
Block is specifically used for：
Determine whether signal-to-noise ratio of the persistent district in preset time section reaches default triggering decision threshold.
It is preferred that the preset time section includes：Multiple sub- time intervals；
Determine whether the signal-to-noise ratio in the persistent district preset time section reaches default triggering decision threshold, institute
Comparison module is stated to be specifically used for：
Add up to the signal-to-noise ratio in each sub- time interval averaging, determines the corresponding average noise of each sub- time interval
Than；
Determine whether that the corresponding average signal-to-noise ratio of each sub- time interval reaches default triggering decision threshold.
It is preferred that the reception power of the reference signal of persistent district is not up to default first decision threshold, the comparison
Module is specifically used for：
If user equipment is the user equipment that multimode list is treated, the reference signal for the cell that the user equipment is resident connects
It receives power and is less than or equal to different system cell selection InterRAT interoperability level thresholds；
If user equipment is the user equipment of multi-mode and multi-standby, the reference signal for the cell that the user equipment is resident connects
Receive the minimum access level that power is less than or equal to the cell that the user equipment is resident.
It is preferred that when the reception power of the reference signal of persistent district is not up to default first decision threshold, true
Before whether the signal-to-noise ratio of the fixed persistent district reaches default triggering decision threshold, the comparison module is additionally operable to：
Judge whether uplink transmission power is more than or equal to default path loss thresholding, if so, determining described resident small
Whether the signal-to-noise ratio in area reaches default triggering decision threshold, otherwise, switches to other cells.
It is preferred that other cells will be switched to, the processing module is specifically used for：
If user equipment is located at the overlapping region of at least two peripheral cells covering, and the reference signal of the peripheral cell
Reception power be less than or equal to default second decision threshold, then according to the peripheral cell in the preset time section
Signal-to-noise ratio, obtain average signal-to-noise ratio；
Compare the average signal-to-noise ratio of the peripheral cell, it is small to switch to determine the maximum corresponding cell of average signal-to-noise ratio
Area；
The user equipment is switched into the switching cell.
It is preferred that after determining the maximum corresponding cell of average signal-to-noise ratio for switching cell, the processing module is also
For：
Reduce the average signal-to-noise ratio of the peripheral cell to default for avoiding the numerical value of frequent switching cell.
It is preferred that other described cells include：Different system cell.
Description of the drawings
Fig. 1 is a kind of flow diagram of the method for cell selection provided in an embodiment of the present invention；
Fig. 2 is a kind of structure diagram of the device of cell selection provided in an embodiment of the present invention.
Specific embodiment
An embodiment of the present invention provides a kind of method and devices of cell selection, are resident to increase user equipment currently
The time of cell promotes the utilization rate of persistent district.
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the present invention is clearly and completely retouched
It states, it is clear that described embodiment is part of the embodiment of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art's all other embodiments obtained without making creative work, all
Belong to the scope of protection of the invention.
Referring to Fig. 1, an embodiment of the present invention provides a kind of method of cell selection, including：
S101, when the reception power RSRP of the reference signal of persistent district is not up to default first decision threshold, really
Whether the SINR of the fixed persistent district reaches default triggering decision threshold SinrQ；
S102, if so, continuing to reside in the persistent district；Otherwise, other cells will be switched to.
Specifically, it is determined that whether the signal-to-noise ratio of the persistent district reaches default triggering decision threshold, including：
Determine whether SINR of the persistent district in preset time section reaches default triggering decision threshold.
Specifically, the preset time section includes：Multiple sub- time intervals；
It determines whether the SINR in the persistent district preset time section reaches default triggering decision threshold, wraps
It includes：
Add up to the signal-to-noise ratio in each sub- time interval averaging, determines the corresponding average noise of each sub- time interval
Than；
Determine whether that the corresponding average signal-to-noise ratio of each sub- time interval reaches default triggering decision threshold.
In the embodiment of the present invention, it is first determined the average signal-to-noise ratio in sub- time interval, that is, SinrFilter time windows,
Determine whether the average signal-to-noise ratio in every SinrFilter time windows reaches default triggering decision threshold SinrQ again, if
It is eligible, then it is assumed that the interference of the persistent district it is smaller, user equipment still can obtain higher in the persistent district
Transmission rate can guarantee conventional data transmission, and also there is no need to be switched to other cells.Compare signal-to-noise ratio due to reducing
Number also just improves efficiency accordingly.
The embodiment of the present invention one enumerates the method selected applied to cell in LTE network, further to provided by the invention
Scheme is introduced.
For ease of understanding, it is simple to introduce the lower user equipment for supporting LTE.Support the user equipment of LTE including following two
Equipment：The user equipment and the user equipment of multi-mode and multi-standby that multimode list is treated.Wherein, the user equipment that multimode list is treated is initiating language
It is carried out during sound business, it is necessary to fall back to 2G wireless networks (or 3G wireless networks) from 4G wireless networks；Due to the use of multi-mode and multi-standby
Family equipment can reside in 4G wireless networks and 2G wireless networks (or 3G wireless networks) simultaneously, and therefore, the user of multi-mode and multi-standby sets
It is standby when initiating speech business, speech business and data service can be respectively in 4G wireless networks, 2G wireless networks (or 3G wireless networks
Network) on carry out.
There are two states in LTE cells for user equipment：Idle Idle state and connected state.Residing for user equipment
In the case that position does not have wireless signal strength LTE cells more better than the wireless signal strength of persistent district, according to inhomogeneity
The user equipment of type is in different states, and this method includes：
If the user equipment that multimode list is treated is in Idle state, it is less than or waits in the RSRP for the cell that user equipment is resident
In the case that InterRAT interoperates level threshold, judge whether the signal-to-noise ratio SINR of persistent district reaches default triggering and sentence
Certainly thresholding SinrQ, if reaching triggering decision threshold, then it is assumed that the interference of the persistent district it is smaller, user equipment is resident at this
Cell still can obtain higher transmission rate, can guarantee conventional data transmission, and also there is no need to be switched to other cells.
If the user equipment that multimode list is treated is in connected state, the type of the business of user equipment initiation is detected, if initiating
Business for VOLTE business, then the RSRP of the cell being resident in user equipment is less than or equal to InterRAT and interoperates level
In the case of thresholding, different system cell is switched to；Otherwise, judge whether the signal-to-noise ratio SINR of persistent district reaches default triggering
Decision threshold SinrQ if reaching triggering decision threshold, wouldn't send measurement report, also triggering cell switching does not refer to base station
Show, still reside at carry out business in persistent district；Wherein, InterRAT interoperability level threshold be greater than or equal to-
115dBm (decibel millivolt), and less than or equal to -120dBm.
If the user equipment of multi-mode and multi-standby is in Idle state, it is less than or waits in the RSRP for the cell that user equipment is resident
In the case of the minimum access level for the cell being resident in user equipment, judge whether the signal-to-noise ratio SINR of persistent district reaches pre-
If triggering decision threshold SinrQ, if reaching triggering decision threshold, then it is assumed that smaller, the Yong Hushe of the interference of the persistent district
It is standby still to obtain higher transmission rate in the persistent district, it can guarantee conventional data transmission, also there is no need to switch
To other cells.
If the user equipment of multi-mode and multi-standby is in connected state, the type of the business of user equipment initiation is detected, if initiating
Business for VOLTE business, then the RSRP for the cell being resident in user equipment is less than or equal to the cell that user equipment is resident
Minimum access level in the case of, be switched to different system cell；Otherwise, judge whether the signal-to-noise ratio SINR of persistent district reaches
Default triggering decision threshold SinrQ if reaching triggering decision threshold, wouldn't send measurement report to base station, also not trigger
Cell switching instruction, still resides at carry out business in persistent district.
Specifically, when the RSRP of persistent district is not up to the minimum access level or resident small for the cell that user equipment is resident
When the RSRP in area is not up to the minimum access level for the cell that user equipment is resident, the signal-to-noise ratio in the definite persistent district is
It is no reach it is default triggering decision threshold before, this method further includes：
Judge whether uplink transmission power is more than or equal to default path loss thresholding, if so, determining described resident small
Whether the signal-to-noise ratio in area reaches default triggering decision threshold, otherwise, switches to other cells.
Specifically, if the wireless signal strength of persistent district is weak, of poor quality, and to be located at least two peripheries small for user equipment
The overlapping region of area's covering, and the RSRP of the peripheral cell is less than or equal to default second decision threshold, then carries out interim
Sluggish method is adjudicated, determines optimal peripheral cell, ensures that user equipment can reside in the minimum cell of interference, ensures number
According to the optimal velocity of transmission.
Wherein, the method for interim judgement sluggishness, including：
According to signal-to-noise ratio of the peripheral cell in the preset time section, average signal-to-noise ratio is obtained；
Compare the average signal-to-noise ratio of the peripheral cell, it is small to switch to determine the maximum corresponding cell of average signal-to-noise ratio
Area；
The user equipment is switched into the switching cell.
Specifically, after determining the maximum corresponding cell of average signal-to-noise ratio for switching cell, this method further includes：
Reduce the average signal-to-noise ratio of the peripheral cell to default for avoiding the numerical value of frequent switching cell.
If the embodiment of the present invention two provides the intensity of the wireless signal of persistent district and pre-determined threshold is not achieved in interference,
And the user equipment is located at the overlapping region of four peripheral cell (cell A, cell B, cell C, cell D) coverings, periphery is small
Whether the RSRP in area meets default second decision threshold, and the difference very little of the RSRP of peripheral cell then exists according to peripheral cell
Signal-to-noise ratio in the preset time section, obtains average signal-to-noise ratio；Compare the average signal-to-noise ratio of the peripheral cell, determine most
The corresponding cell of big average signal-to-noise ratio is switching cell；The user equipment is switched into the switching cell.By above-mentioned
The interference for the switching cell that method determines is that minimum is disturbed in four peripheral cells, that is, data transmission bauds maximum.
In order to avoid user equipment is in cell A cells, B cells, C cells, D minizones frequent switching, gravity treatment, this method exists
The maximum corresponding cell of average signal-to-noise ratio is determined after switching cell, to further include,
Reduce the average signal-to-noise ratio of the peripheral cell to default for avoiding the numerical value of frequent switching cell.
By the above method, avoid due to the faint variation of the interference value of the wireless signal in switching cell, it is caused
User equipment frequent switching between peripheral cell ensures that user equipment is resided in definite switching cell, unless switching cell
SINR be less than default triggering decision threshold.
Referring to Fig. 2, a kind of device of cell selection provided in an embodiment of the present invention, including：
Comparison module 201, the reception power for working as the reference signal of persistent district are not up to default first decision gate
In limited time, determine whether the signal-to-noise ratio of the persistent district reaches default triggering decision threshold；
Processing module 202, for if so, continuing to reside in the persistent district；Otherwise, it is small that other will be switched to
Area.
It is preferred that determining whether the signal-to-noise ratio of the persistent district reaches default triggering decision threshold, the relatively mould
Block 201 is specifically used for：
Determine whether signal-to-noise ratio of the persistent district in preset time section reaches default triggering decision threshold.
It is preferred that the preset time section includes：Multiple sub- time intervals；
Determine whether the signal-to-noise ratio in the persistent district preset time section reaches default triggering decision threshold, institute
Comparison module 201 is stated to be specifically used for：
Add up to the signal-to-noise ratio in each sub- time interval averaging, determines the corresponding average noise of each sub- time interval
Than；
Determine whether that the corresponding average signal-to-noise ratio of each sub- time interval reaches default triggering decision threshold.
It is preferred that the reception power of the reference signal of persistent district is not up to default first decision threshold, the comparison
Module 201 is specifically used for：
If user equipment is the user equipment that multimode list is treated, the reference signal for the cell that the user equipment is resident connects
It receives power and is less than or equal to different system cell selection InterRAT interoperability level thresholds；
If user equipment is the user equipment of multi-mode and multi-standby, the reference signal for the cell that the user equipment is resident connects
Receive the minimum access level that power is less than or equal to the cell that the user equipment is resident.
It is preferred that when the reception power of the reference signal of persistent district is not up to default first decision threshold, true
Before whether the signal-to-noise ratio of the fixed persistent district reaches default triggering decision threshold, the comparison module 201 is additionally operable to：
Judge whether uplink transmission power is more than or equal to default path loss thresholding, if so, determining described resident small
Whether the signal-to-noise ratio in area reaches default triggering decision threshold, otherwise, switches to other cells.
It is preferred that other cells will be switched to, the processing module 202 is specifically used for：
If user equipment is located at the overlapping region of at least two peripheral cells covering, and the reference signal of the peripheral cell
Reception power be less than or equal to default second decision threshold, then according to the peripheral cell in the preset time section
Signal-to-noise ratio, obtain average signal-to-noise ratio；
Compare the average signal-to-noise ratio of the peripheral cell, it is small to switch to determine the maximum corresponding cell of average signal-to-noise ratio
Area；
The user equipment is switched into the switching cell.
It is preferred that after determining the maximum corresponding cell of average signal-to-noise ratio for switching cell, the processing module 202
It is additionally operable to：
Reduce the average signal-to-noise ratio of the peripheral cell to default for avoiding the numerical value of frequent switching cell.
In conclusion an embodiment of the present invention provides a kind of method and device of cell selection, by being directed to wireless network
The intensity of signal is weak, i.e. the reception power of the reference signal of persistent district is unsatisfactory for the situation of the first decision threshold, then by staying
Stay whether the signal-to-noise ratio of cell reaches default triggering decision threshold, to determine the size of the interference of the persistent district, if meeting
Condition, then it is assumed that user equipment still can obtain higher transmission rate in the persistent district, can guarantee that conventional data pass
It is defeated.To increase the time that user equipment resides in LTE wireless networks, the utilization rate of LTE wireless networks is promoted, adds LTE
The soft coverage rate of wireless network effectively promotes LTE wireless networks and is resident ratio, increases 2G data services toward LTE wireless networks
Shunting saves the quantity for building LTE base station, reduces base station construction cost.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the present invention
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the present invention
The shape for the computer program product that usable storage medium is implemented on (including but not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and scope.In this way, if these modifications and changes of the present invention belongs to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these modification and variations.
Claims (14)
- A kind of 1. method of cell selection, which is characterized in that including：When the reception power of the reference signal of persistent district is not up to default first decision threshold, the persistent district is determined Signal-to-noise ratio whether reach default triggering decision threshold；If so, continue to reside in the persistent district；Otherwise, other cells will be switched to.
- 2. according to the method described in claim 1, it is characterized in that, determine whether the signal-to-noise ratio of the persistent district reaches default Triggering decision threshold, including：Determine whether signal-to-noise ratio of the persistent district in preset time section reaches default triggering decision threshold.
- 3. according to the method described in claim 2, it is characterized in that, the preset time section includes：Multiple sub- time intervals；Determine whether the signal-to-noise ratio in the persistent district preset time section reaches default triggering decision threshold, including：Add up to the signal-to-noise ratio in each sub- time interval averaging, determines the corresponding average signal-to-noise ratio of each sub- time interval；Determine whether that the corresponding average signal-to-noise ratio of each sub- time interval reaches default triggering decision threshold.
- 4. according to the method described in claim 1, it is characterized in that, the reception power of the reference signal of persistent district is not up to pre- If the first decision threshold, including：If user equipment is the user equipment that multimode list is treated, the reception work(of the reference signal for the cell that the user equipment is resident Rate is less than or equal to different system cell selection InterRAT interoperability level thresholds；If user equipment is the user equipment of multi-mode and multi-standby, the reception work(of the reference signal for the cell that the user equipment is resident Rate is less than or equal to the minimum access level for the cell that the user equipment is resident.
- 5. according to the method described in claim 1, it is characterized in that, when the reception power of the reference signal of persistent district is not up to During default first decision threshold, determine the persistent district signal-to-noise ratio whether reach it is default triggering decision threshold it Before, this method further includes：Judge whether uplink transmission power is more than or equal to default path loss thresholding, if so, determining the persistent district Whether signal-to-noise ratio reaches default triggering decision threshold, otherwise, switches to other cells.
- 6. according to the method described in claim 1, it is characterized in that, other cells will be switched to, including：If the user equipment is located at the overlapping region of at least two peripheral cells covering, and the reference signal of the peripheral cell Reception power be less than or equal to default second decision threshold, then according to the peripheral cell in the preset time section Signal-to-noise ratio, obtain average signal-to-noise ratio；Compare the average signal-to-noise ratio of the peripheral cell, it is switching cell to determine the maximum corresponding cell of average signal-to-noise ratio；The user equipment is switched into the switching cell.
- 7. according to the method described in claim 6, it is characterized in that, determining that the maximum corresponding cell of average signal-to-noise ratio is to cut After changing district, this method further includes：Reduce the average signal-to-noise ratio of the peripheral cell to default for avoiding the numerical value of frequent switching cell.
- 8. a kind of device of cell selection, which is characterized in that including：Comparison module, for when the reception power of the reference signal of persistent district is not up to default first decision threshold, really Whether the signal-to-noise ratio of the fixed persistent district reaches default triggering decision threshold；Processing module, for if so, continuing to reside in the persistent district；Otherwise, other cells will be switched to.
- 9. device according to claim 8, which is characterized in that determine whether the signal-to-noise ratio of the persistent district reaches default Triggering decision threshold, the comparison module is specifically used for：Determine whether signal-to-noise ratio of the persistent district in preset time section reaches default triggering decision threshold.
- 10. device according to claim 9, which is characterized in that the preset time section includes：Multiple sub- time zones Between；Determine whether the signal-to-noise ratio in the persistent district preset time section reaches default triggering decision threshold, the ratio It is specifically used for compared with module：Add up to the signal-to-noise ratio in each sub- time interval averaging, determines the corresponding average signal-to-noise ratio of each sub- time interval；Determine whether that the corresponding average signal-to-noise ratio of each sub- time interval reaches default triggering decision threshold.
- 11. device according to claim 8, which is characterized in that the reception power of the reference signal of persistent district is not up to Default first decision threshold, the comparison module are specifically used for：If user equipment is the user equipment that multimode list is treated, the reception work(of the reference signal for the cell that the user equipment is resident Rate is less than or equal to different system cell selection InterRAT interoperability level thresholds；If user equipment is the user equipment of multi-mode and multi-standby, the reception work(of the reference signal for the cell that the user equipment is resident Rate is less than or equal to the minimum access level for the cell that the user equipment is resident.
- 12. device according to claim 8, which is characterized in that when the reception power of the reference signal of persistent district does not reach During to default first decision threshold, determine the persistent district signal-to-noise ratio whether reach it is default triggering decision threshold it Before, the comparison module is additionally operable to：Judge whether uplink transmission power is more than or equal to default path loss thresholding, if so, determining the persistent district Whether signal-to-noise ratio reaches default triggering decision threshold, otherwise, switches to other cells.
- 13. device according to claim 8, which is characterized in that other cells will be switched to, the processing module is specifically used In：If user equipment is located at the overlapping region of at least two peripheral cells covering, and the reference signal of the peripheral cell connects It receives power and is less than or equal to default second decision threshold, then the letter according to the peripheral cell in the preset time section It makes an uproar and compares, obtain average signal-to-noise ratio；Compare the average signal-to-noise ratio of the peripheral cell, it is switching cell to determine the maximum corresponding cell of average signal-to-noise ratio；The user equipment is switched into the switching cell.
- 14. device according to claim 13, which is characterized in that be in the definite maximum corresponding cell of average signal-to-noise ratio After switching cell, the processing module is additionally operable to：Reduce the average signal-to-noise ratio of the peripheral cell to default for avoiding the numerical value of frequent switching cell.
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