CN105282795A - Cell reselection method and mobile terminal in high-speed moving process - Google Patents
Cell reselection method and mobile terminal in high-speed moving process Download PDFInfo
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- CN105282795A CN105282795A CN201410309276.8A CN201410309276A CN105282795A CN 105282795 A CN105282795 A CN 105282795A CN 201410309276 A CN201410309276 A CN 201410309276A CN 105282795 A CN105282795 A CN 105282795A
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- 238000000034 method Methods 0.000 title abstract description 31
- 230000005484 gravity Effects 0.000 claims description 38
- 238000004891 communication Methods 0.000 claims description 18
- 238000011156 evaluation Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000010295 mobile communication Methods 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 abstract 1
- 206010066901 Treatment failure Diseases 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 230000001413 cellular effect Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
Abstract
The invention discloses a cell reselection method and a mobile terminal in a high-speed moving process, which belong to the technical field of mobile communication. The cell reselection method is suitable for the mobile terminal in the high-speed moving process, and specifically comprises the steps of: selecting a serving cell conforming to a dwelling condition; measuring neighboring cells and maintaining a target cell list; and executing cell reselection according to the target cell list when in need of cell reselection, judging whether the cell reselection is successful, and trying cell reselection repeatedly for the cell failed in reselection a limited number of times. The technical scheme aims to replace the traditional cell selection full spectrum band searching process by trying cell reselection repeatedly for the cell failed in reselection a limited number of times, reduces searching loss, improves reselection efficiency, and decreases network losing time.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to the residence reselecting in a kind of high speed movement and mobile terminal.
Background technology
Mobile terminal in existing mobile communication system, can run into the problem of cell reselection usually when communicating.So-called cell reselection carries out judging according to the measurement report of terminal.When through measuring, terminal finds that the signal strength signal intensity of current Serving cell can not meet the communication requirement of user, or there is the communication requirement that the more excellent adjacent cell of signal strength signal intensity can meet user, then can start cell reselection process, the adjacent cell that one is more preferably selected is chosen as current Serving cell and resident, to ensure the communication quality of user.
In prior art, in stand-by mode, mobile terminal period Xing Didui community is measured, the information such as the signal quality of acquisition adjacent cell and time offset value, and when meeting certain condition, obtain the system information block etc. of adjacent cell, in order to carrying out cell reselection.
When mobile terminal to be in a high speed movement when mobile terminal (such as user use in high ferro), cause doppler shift effect obvious because translational speed is too fast, train body loss is larger, scene more complicated on the way, these all likely cause certain the link failure in cell reselection and cell selection procedure, therefore cause the mobile terminal be in high-speed mobile can lose network within blink, Consumer's Experience is poor.And existing cell reselection process, after gravity treatment failure, directly jump to next community searches for, and search time is longer, and search efficiency is lower, the time of adding users lost network.
Summary of the invention
According to problems of the prior art, namely existing cell reselection process is in high speed movement cannot promotes search efficiency well at mobile terminal, reduces search time;
Residence reselecting in a kind of high speed movement and mobile terminal are now provided, being applicable to mobile terminal is in high speed movement, be intended to carry out alternative traditional gravity treatment unsuccessfully carry out Whole frequency band search cell process to carry out rewritten a limited number of times repeated attempt to the Target cell of gravity treatment failure when cell reselection failure, promote reselection efficiency, reduce user's lost network time.
Technical scheme of the present invention specifically comprises:
A residence reselecting in high speed movement, wherein, performs described residence reselecting when described mobile terminal is in high speed movement;
Described residence reselecting specifically comprises:
Step S1, mobile terminal selects one to meet the Serving cell of resident condition and resident;
Step S2, measures adjacent cell and safeguards that one can for the target cell list of gravity treatment;
Step S3, carries out reselection evaluation to current described Serving cell, to judge whether to need to carry out cell reselection,
Carry out cell reselection if do not need, then return described step S2;
Step S4, performs cell reselection according to described target cell list, judges that whether cell reselection is successful:
If cell reselection success, then using resident as current Serving cell by the Target cell of gravity treatment, with backed off after random;
Step S5, reselection frequency adds 1, and judges whether described reselection frequency reaches a threshold value preset:
If described reselection frequency does not reach described threshold value, then return described step S2;
Step S6, carries out Whole frequency band search, to find the community meeting resident condition resident as current described Serving cell, with backed off after random.
Preferably, residence reselecting in this high speed movement, wherein, by the translational speed of the described mobile terminal detected and a speed threshold value preset being compared, and judge that when the translational speed of described mobile terminal is greater than described speed threshold value described mobile terminal is in high speed movement.
Preferably, the residence reselecting in this high speed movement, wherein, also comprises in described step S2, carries out off-line measurement to without synchronous adjacent cell.
Preferably, the residence reselecting in this high speed movement, wherein, in described step S4, when cell reselection failure, first performs following steps:
Step S41, judges whether there is an alternative Target cell in described target cell list;
If there is not alternative described Target cell, then go to described step S5;
Step S42, performs cell reselection to alternative described Target cell, and judges that whether gravity treatment is successful;
If gravity treatment success, then described Target cell is resident as Serving cell, with backed off after random;
If gravity treatment is unsuccessful, then return described step S41.
Preferably, the residence reselecting in this high speed movement, wherein, if cell reselection success, then described reselection frequency resets.
Preferably, the residence reselecting in this high speed movement, wherein, is applied in WCDMA communication system.
A kind of mobile terminal, wherein, adopts above-mentioned residence reselecting.
The beneficial effect of technique scheme is:
1) to substitute with the Target cell of rewritten a limited number of times repeated attempt gravity treatment failure when cell reselection failure and reselect new Target cell, reduce hunting loss, promote reselection efficiency;
2) improve the network coverage of mobile terminal, reduce the lost network time of mobile terminal.
Accompanying drawing explanation
Fig. 1 is in preferred embodiment of the present invention, a kind of overview flow chart of residence reselecting;
Fig. 2 is in preferred embodiment of the present invention, community is carried out to the schematic flow sheet of gravity treatment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
Cell reselection technique of the prior art, usually turns to and again finds next new community after cell reselection failure.But be in the process of high-speed mobile at mobile terminal, such as, when being in the train of a high-speed mobile, cause doppler shift effect obvious because translational speed is too fast, train body loss is larger, scene also more complicated on the way, these factors have larger certain environment failure that may cause in cell reselection and cell selection procedure, thus cause the mobile terminal be in high speed movement can lose network at short notice, cause bad Consumer's Experience.
Existing high ferro base station construction is universal gradually merges cellular technology with many RRU (RadioRemoteUnit, Remote Radio Unit).So-called with many RRU merging cellular technology, i.e. full cell transmission technology, the coverage of a community is divided into multiple sector or multiple little area of coverage, is received in each sector or the little area of coverage by different reception antennas, transmitting of all sectors or the little area of coverage is identical.In brief, merge with many RRU the covering power that cellular technology can improve single subdistrict, reduce number of base stations simultaneously, more agree with the arrangement of base stations that high ferro is along the line.
Under this base station coverage, when mobile terminal is in high speed movement, when cell reselection failure, rewritten a limited number of times repeated attempt is carried out to the Target cell of gravity treatment failure, the reselecting method that its hunting loss reselects next Target cell is more traditionally lower, correspondingly promotes reselection efficiency.Therefore, provide a kind of to be intended to carry out to carry out rewritten a limited number of times repeated attempt when cell reselection is failed to the Target cell of gravity treatment failure the technical scheme that the cell reselection process of next Target cell is found in alternative traditional failure again.
Technique scheme specifically comprises:
A residence reselecting in high speed movement, step as shown in Figure 1, comprising:
Step S1, mobile terminal selects one to meet the Serving cell of resident condition and resident;
In preferred embodiment of the present invention, mobile terminal-opening initialization, selects the Serving cell of Serving cell as current access meeting resident condition subsequently in the standby state automatically, and resident, to communicate with the base station of this Serving cell;
Step S2, measures adjacent cell and safeguards that one can for the target cell list of gravity treatment;
In preferred embodiment of the present invention, to without synchronous adjacent cell measurement with to pass through synchronous adjacent cell measurement mode not identical, off-line measurement is carried out to not synchronous adjacent cell.
Above-mentionedly adjacent cell measured and generates a target cell list, and a variety of implementation can be had to a series of detailed processes that this target cell list is safeguarded in prior art, not repeating them here.Due to the present invention pay close attention to in high speed movement to the control method of cell reselection, generate the concrete steps of target cell list, therefore not to generation and safeguard that the concrete grammar of target cell list limits.
Step S3, carries out reselection evaluation to current Serving cell, to judge whether to need to carry out cell reselection;
Carry out cell reselection if do not need, then return step S2;
In preferred embodiment of the present invention, the process of current Serving cell being carried out to reselection evaluation can according to protocol specification, or existing technical scheme is carried out, reselection evaluation is carried out to community and can have a variety of method according to prior art, respective change can be carried out according to the difference of communication protocol and communication control method etc.Due to the control method for cell reselection that the present invention pays close attention to, and the process of community being carried out to reselection evaluation of non-specific, the method for therefore carrying out reselection evaluation in this Bu Dui community limits.
In preferred embodiment of the present invention, as needs carry out cell reselection, then enter into next step.
Step S4, performs cell reselection according to target cell list, judges that whether cell reselection is successful:
If cell reselection success, then using resident as current Serving cell by the Target cell of gravity treatment, with backed off after random;
In preferred embodiment of the present invention, when terminal normally can access the community by gravity treatment, then judge now cell reselection success, substitute the Serving cell of original community as the current access of terminal using by the community of gravity treatment.
In preferred embodiment of the present invention, if cell reselection is unsuccessful, then enter into next step.
Step S5, reselection frequency adds 1, and judges whether reselection frequency reaches a threshold value preset:
If reselection frequency does not reach threshold value, then return step S2;
Cover because many employings in base station that high ferro is along the line merge cell manner with RRU, then carrying out the efficiency of repeated attempt to cell re-selection target failed before will far above the mode unsuccessfully once namely finding next Target cell.But repeat that gravity treatment is carried out to one or limited several Target cell unlimitedly and obviously also cannot reach the object of raising the efficiency, sometimes even can be absorbed in endless loop, therefore need to give certain restriction to number of repetition.
Therefore, in preferred embodiment of the present invention, adopt the number of times of counter to cell reselection failure comprising predetermined threshold value to count.When count value reaches default threshold value, expression repeats to carry out gravity treatment to Target cell still cannot be successful, now just considers to find next new Target cell.
In preferred embodiment of the present invention, when reselection frequency does not reach threshold value, then return above-mentioned steps S2, and continue to carry out gravity treatment to the adjacent cell in this target cell list.
In preferred embodiment of the present invention, the process that gravity treatment carried out to community be one for limited multiple Target cells, the repeated attempt of limited number of time is adopted to realize, the controlled cyclic process of a number of attempt, to be lifted at the efficiency of the mobile terminal re-selecting cell in high speed movement by this cyclic process.
Step S6, carry out Whole frequency band search, to find the community meeting resident condition resident as current Serving cell, with backed off after random.
In preferred embodiment of the present invention, when the cell reselection through limited number of time still cannot select corresponding community, then now mobile terminal may enter in the scope of another Serving cell, needs to carry out Whole frequency band search, may by the Target cell of gravity treatment to redefine.
In preferred embodiment of the present invention, after no matter adopting which kind of mode to carry out cell reselection success, by the counter O reset of reselection frequency, to prepare cell reselection next time.
In preferred embodiment of the present invention, above-mentioned generation also safeguards that the step of target cell list is the prerequisite steps preparing to carry out cell reselection.
As above as described in step, the object of the invention is to:
When mobile terminal is in high speed movement (be such as in one move in high ferro on), start cell reselection process of the present invention: first determine target cell list, and when needing to carry out cell reselection with target cell list in can be gravity treatment scope for the community of gravity treatment, when cell reselection failure, the Target cell of gravity treatment failure is carried out to the repeated attempt of limited number of times, to substitute in traditional cell reselection process once failure turns to the reuse adoption process again finding next community immediately, promote reselection efficiency, reduce the lost network time, ensure the communication quality of user.
In preferred embodiment of the present invention, in above-mentioned steps S4, if cell reselection failure, then first perform step as shown in Figure 2:
Step S41, judges whether there is an alternative Target cell in target cell list;
If there is not alternative Target cell, then go to step S5;
In preferred embodiment of the present invention, if there is not alternative Target cell, then think there is not the adjacent cell that can supply gravity treatment in this target cell list, then perform step S5, namely think that this gravity treatment is failed, reselection frequency adds 1.
Step S42, performs cell reselection to alternative Target cell, and judges that whether gravity treatment is successful;
If gravity treatment success, then this Target cell is resident as Serving cell, with backed off after random;
If gravity treatment failure, then return step S41.
In preferred embodiment of the present invention, above-mentioned steps is to judge whether to exist " secondary select target ";
If exist " secondary select target ", then continue to carry out cell reselection to " secondary select target ";
If there is not " secondary select target ", then think there is not the adjacent cell can carrying out gravity treatment in this target cell list, now return step S5, namely determine this gravity treatment failure, reselection frequency adds 1.
In sum, the object of the invention is to, terminal is in high speed movement, agree with high ferro base station setting on the way and carry out to carry out rewritten a limited number of times repeated attempt to the Target cell of gravity treatment failure the reselection modes that namely alternative gravity treatment unsuccessfully finds next community again, can power consumption be reduced, promote reselection efficiency, adapt to the mobile terminal be in high speed movement better, make its lost network time shorten, communication quality promotes, and Consumer's Experience sense is good.
In preferred embodiment of the present invention, above-mentioned residence reselecting is applied in WCDMA communication system.
In other embodiments of the present invention, above-mentioned residence reselecting can be applied to gsm communication system equally, or TD-SCDMA communication system, or in LTE communication system or cdma communication system.
In preferred embodiment of the present invention, also provide a kind of mobile terminal, wherein adopt above-mentioned residence reselecting.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (7)
1. the residence reselecting in high speed movement, is characterized in that, performs described residence reselecting when described mobile terminal is in high speed movement;
Described residence reselecting specifically comprises:
Step S1, mobile terminal selects one to meet the Serving cell of resident condition and resident;
Step S2, measures adjacent cell and safeguards that one can for the target cell list of gravity treatment;
Step S3, carries out reselection evaluation to current described Serving cell, to judge whether to need to carry out cell reselection,
Carry out cell reselection if do not need, then return described step S2;
Step S4, performs cell reselection according to described target cell list, judges that whether cell reselection is successful:
If cell reselection success, then using resident as current Serving cell by the Target cell of gravity treatment, with backed off after random;
Step S5, reselection frequency adds 1, and judges whether described reselection frequency reaches a threshold value preset:
If described reselection frequency does not reach described threshold value, then return described step S2;
Step S6, carries out Whole frequency band search, to find the community meeting resident condition resident as current described Serving cell, with backed off after random.
2. the residence reselecting in high speed movement as claimed in claim 1, it is characterized in that, by the translational speed of the described mobile terminal detected and a speed threshold value preset being compared, and judge that when the translational speed of described mobile terminal is greater than described speed threshold value described mobile terminal is in high speed movement.
3. the residence reselecting in high speed movement as claimed in claim 1, is characterized in that, also comprise in described step S2, carry out off-line measurement to without synchronous adjacent cell.
4. the residence reselecting in high speed movement as claimed in claim 1, is characterized in that, in described step S4, when cell reselection failure, first performs following steps:
Step S41, judges whether there is an alternative Target cell in described target cell list;
If there is not alternative described Target cell, then go to described step S5;
Step S42, performs cell reselection to alternative described Target cell, and judges that whether gravity treatment is successful;
If gravity treatment success, then described Target cell is resident as Serving cell, with backed off after random;
If gravity treatment is unsuccessful, then return described step S41.
5. the residence reselecting in high speed movement as claimed in claim 1, is characterized in that, if cell reselection success, then described reselection frequency resets.
6. the residence reselecting in high speed movement as claimed in claim 1, is characterized in that, be applied to WCDMA communication system, or gsm communication system, or TD-SCDMA communication system, or LTE communication system, or in cdma communication system.
7. a mobile terminal, is characterized in that, adopts the residence reselecting as described in claim 1-6.
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| CN201410309276.8A CN105282795B (en) | 2014-06-30 | 2014-06-30 | Residence reselecting and mobile terminal in a kind of high speed movement |
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| CN111278068A (en) * | 2020-01-20 | 2020-06-12 | 赣江新区智慧物联研究院有限公司 | Method and device for establishing and recovering wireless backhaul link based on high-frequency pole station |
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Application publication date: 20160127 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Tianjin) Co.,Ltd. Contract record no.: X2021110000055 Denomination of invention: Cell reselection method in high-speed mobile process and mobile terminal Granted publication date: 20190528 License type: Exclusive License Record date: 20211227 |
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