CN103096402B - A kind of residence reselecting and a kind of cell switching method - Google Patents
A kind of residence reselecting and a kind of cell switching method Download PDFInfo
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Abstract
The invention provides a kind of residence reselecting, the channel quality of the UE Monitoring Service community under idle condition and the adjacent cell of Serving cell, described Serving cell is macrocell; When meeting cell re-selection conditions, judge that potential reselection target cell is not macrocell and self is in high-speed moving state, if so, then UE adjustment cell reselection parameters realizes delaying cell reselection.Present invention also offers a kind of cell switching method.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of residence reselecting and a kind of cell switching method.
Background technology
In order to meet the performance requirement index of IMT-Advanced (4G), 3GPP has carried out the research of the follow-up evolution of LTE technology, i.e. LTE-Advanced.LTE-Advanced system maintains the backwards compatibility to LTE system preferably, and can meet demand and the application of wireless communications market in the coming years.
A feature of LTE-Advanced system have employed heterogeneous network node networking.So-called heterogeneous network node, refers to that these network nodes have the coverage of different size, dissimilar back haul link.In LTE-Advanced, this network be made up of heterogeneous network node is called heterogeneous network.Typical heterogeneous network node comprises: macro base station (Macro), micro-base station (Pico), Home eNodeB (Femto) and relay base station (Relay).Wherein, Macro community is for providing the covering of wide area; Pico community, for improving the capacity in hot spot service area, balances the load of Macro community; Femto community is used for providing better service quality for personal user; Relay community for expanding the covering of Macro cell edge, or is deployed in the place being inconvenient to dispose wired backhaul.
Heterogeneous network changes the topological structure of conventional cellular network, deploys so website with different transmission power and coverage more simultaneously, make network design more flexible in system.But heterogeneous network also brings some new challenges to system, the series of problems that new network configuration is brought all needs to solve.In the coverage of macro base station, add a large amount of overlapping website covered, can increase too much " cell edge ", therefore can increase the complexity of mobile management, especially add the complexity of cell reselection and cell merge.
Cell reselection refers to that the UE being in idle condition (idle) transfers to the process of another community from a community.Cell reselection is the behavior that UE is autonomous, and UE, according to the channel quality measurements of Serving cell and adjacent cell, selects the new Serving cell meeting cell re-selection conditions.Prior art small area reuse adoption process as shown in Figure 1, when the difference of the channel quality and threshold value that meet adjacent cell is more than Q
hystcondition time, UE starts cell reselection timer (Treselection
rAT).If at Treselection
rATbefore timer expiry, the channel quality of adjacent cell meets this condition always, works as Treselection
rATwhen timer expiry UE will gravity treatment to this adjacent cell; If at Treselection
rATbefore timer expiry, the channel quality of adjacent cell no longer meets this condition, and UE does not carry out cell reselection.Introduce Treselection
rATthe object of timer reduces unnecessary cell reselection.In the prior art, Q
hystand Treselection
rATtransmitted by broadcast, Q
hystunit be decibel (dB), Treselection
rATunit be millisecond (ms).
In existing standard, when UE is in high-speed moving state time, can cell reselection process be accelerated, namely reduce Q
hystthe size of value, shortens Treselection
rATthe duration of timer.Under heterogeneous network scene, may dispose a large amount of Pico communities in Macro cell coverage area, conventionally, the UE under idle condition can carry out cell reselection continually, adds the complexity that UE realizes.
Cell merge refers to that the UE be under connection status transfers to the process of another community from a community.Adopting in existing standard is the cell switching method of " UE auxiliary, network decision "." UE assists ", refers to the channel quality that base station will report with reference to UE when carrying out switch decision.The channel quality of UE Monitoring Service community and adjacent cell, in time finding that the channel of Serving cell and adjacent cell meets certain condition, UE is to eNB report measurement results." network decision ", refers to the measurement result that eNB reports according to UE, determines whether this UE is switched to other communities.Handoff procedure as shown in Figure 2, when the channel quality of adjacent cell and the differential channel quality of Serving cell more than offset time, UE thinks and meets trigger condition, starts timeToTrigger timer.Before timeToTrigger timer expiry, if the channel quality of the channel quality of Serving cell and adjacent cell meets this condition always, measurement result is reported eNB when timeToTrigger timer expiry by UE; Before timeToTrigger timer expiry, if the channel quality of the channel quality of Serving cell and adjacent cell no longer meets this condition, so UE stops timeToTrigger timer, continues the channel quality of Monitoring Service community and adjacent cell.The effect introducing timeToTrigger timer reduces pingpang handoff.In the prior art, offset and timeToTrigger is transmitted by broadcast, and the unit of offset is the unit of decibel dB, timeToTrigger is a millisecond ms.
In prior art, considering that Macro community is relatively more urgent to the switching of Pico community, in order to reduce handover failure rate, the switching of Macro community to Pico community should be accelerated.The method is by adopting the timeToTrigger timer of different duration to control to switch speed.The advantage of the method is the handover success rate in can improving, under low speed scene, and shortcoming to improve pingpang handoff rate.For the situation of high-speed mobile, even if accelerate to switch, still have and may switch unsuccessfully, the method is to the limited use reducing handover failure rate.
Summary of the invention
The invention provides a kind of residence reselecting and a kind of cell switching method, can greatly reduce unnecessary cell reselection and cell merge.
A kind of residence reselecting that the embodiment of the present invention provides, comprises the steps:
The channel quality of the UE Monitoring Service community under A, idle condition and the adjacent cell of Serving cell, described Serving cell is macrocell;
B, described UE judge whether the channel quality of Serving cell and adjacent cell meets cell re-selection conditions, if so, perform step C, otherwise return steps A;
C, judge whether potential reselection target cell is macrocell, if so, performs step e, otherwise, perform step D;
D, UE judge that whether self is in high-speed moving state, if so, performs step F, otherwise perform step e;
E, UE carry out normal cell reselection, and process ends;
F, UE adjust cell reselection parameters and realize delaying cell reselection.
Preferably, UE described in step B judges whether the channel quality of Serving cell and adjacent cell meets cell re-selection conditions and comprise:
When the difference of the channel quality and threshold value that meet adjacent cell is more than Q
hystcondition time, UE starts Treselection
rATtimer, if the channel quality of adjacent cell and the difference of threshold value are all the time more than Q before described timer expiry
hyst, then judge to meet cell re-selection conditions, other situations then judge not meet cell re-selection conditions; Described Q
hystand Treselection
rATby the parameter that broadcast is transmitted.
Preferably, step D comprises:
UE adds up the number of times that cell reselection occurs for self, if at T
cRmaxin time, the number of times that cell reselection occurs UE is greater than the first threshold value but is less than the second threshold value, and so UE is in middling speed mobile status; If at T
cRmaxin time, the number of times that cell reselection occurs UE is greater than the second threshold value, and so UE is in high-speed moving state; In all the other situations, UE is in constant speed mobile status, T
cRmaxfor the parameter transmitted by broadcast.
Preferably, step F comprises: UE is by increasing Q
hystand/or Treselection
rATvalue realize delay cell reselection.
Preferably, step F comprises:
UE receiving package contains the broadcast of the first weighted factor sf_1 and/or the second weighted factor sf_2, by Q
hystadd that the first weighted factor sf_1 is as new Q
hystand/or by Treselection
rATbe multiplied by the second weighted factor sf_2 as new Treselection
rAT.
A kind of cell switching method that the embodiment of the present invention provides, comprises the steps:
The channel quality of the UE Monitoring Service community under a, connection status and the adjacent cell of Serving cell, described Serving cell is macrocell;
B, described UE judge whether the channel quality of Serving cell and adjacent cell meets and measure report condition, if so, perform step c, otherwise return step a;
C, judge whether potential switching target small area is macrocell, if so, perform step e, otherwise, perform steps d;
D, UE judge whether self is in high-speed moving state, if so, perform step f, otherwise perform step e;
E, UE carry out normal measurement and report, and then perform step g;
F, UE adjustment measurement reports parameter to realize delaying measurement and reports;
G: the measurement parameter that base station reports according to UE determines whether this UE is switched to Target cell.
Preferably, UE described in step b judges whether the channel quality of Serving cell and adjacent cell meets measurement report condition and comprise:
When condition more than offset of the difference of the channel quality and threshold value that meet adjacent cell, UE starts timeToTrigger timer, if the channel quality of adjacent cell and the difference of threshold value are all the time more than offset before described timer expiry, then judge to meet to measure report condition, other situations then judge not meet measurement report condition; The parameter that described offset and timeToTrigger is transmitted by broadcast.
Preferably, steps d comprises:
UE adds up the number of times that cell merge occurs for self, if at T
cRmaxin time, the number of times that cell merge occurs UE is greater than the first threshold value but is less than the second threshold value, and so UE is in middling speed mobile status; If at T
cRmaxin time, the number of times that cell merge occurs UE is greater than the second threshold value, and so UE is in high-speed moving state; In all the other situations, UE is in constant speed mobile status, T
cRmaxfor the parameter transmitted by broadcast.
Preferably, step f comprises: UE realizes delaying measurement by the value increasing offset and/or timeToTrigger and reports.
Preferably, step f comprises:
Offset, containing the broadcast of the 3rd weighted factor sf_3 and/or the 4th weighted factor sf_4 or radio resource control RRC message, is added that the 3rd weighted factor sf_3 is as new offset and/or timeToTrigger is multiplied by the 4th weighted factor sf_4 as new timeToTrigger by UE receiving package.
As can be seen from the above technical solutions, UE is when carrying out cell reselection and cell merge, if Target cell is not macrocell and self is in high-speed moving state, then delay to carry out cell reselection and cell merge, thus reduce UE cell reselection unnecessary in high speed movement and cell merge.
Accompanying drawing explanation
Fig. 1 is prior art small area reuse adoption process schematic diagram;
Fig. 2 is prior art small area handoff procedure schematic diagram;
A kind of cell re-selection procedure figure that Fig. 3 provides for the embodiment of the present invention;
A kind of cell merge flow chart that Fig. 4 provides for the embodiment of the present invention.
Embodiment
In heterogeneous network, Pico community generally can be deployed in traffic hotspots area, to improve the throughput of hot zones, shares the load of Macro community simultaneously.Consider actual conditions, Pico community central area often user than comparatively dense, and often there is not the UE of high-speed mobile in Pico center of housing estate region.For some UE at a high speed under the connection status of Pico cell edge, after being switched to Pico community, may, in a short period of time again from Pico cell merge to other communities, be equivalent to like this add unnecessary switching.According to prior art, if switching target is Pico community, should accelerate corresponding handoff procedure, this can worsen performance of handoffs further.Similar problem is also existed for the UE under idle condition, because UE can carry out a large amount of cell reselection, improves implementation complexity and the power consumption of UE.Cause the basic reason of the problems referred to above to be under heterogeneous network scene, the UE of some high-speed mobile is through Pico community, and real intention is served for a long time in order to enter Pico community, and is only pass by Pico community.
The inventive method is optimized cell reselection and switching flow, the cell reselection as far as possible avoiding some unnecessary and switching.The method is strengthened by the condition reported trigger cell reselection and handover measurement and realizes.
The factor having influence on cell reselection speed comprises parameter Q
hystand Treselection
rAT.Q
hystand Treselection
rATvalue larger, cell reselection is slower; Q
hystand Treselection
rATvalue less, cell reselection is faster.Have influence on and switch the factor of speed to comprise the value of parameter offset and timeToTrigger, offset and timeToTrigger larger, switch slower; The value of offset and timeToTrigger is less, switches faster.Therefore, can adjustment cell reselection be reached by adjusting the size of above-mentioned parameter and switch speed, and then reach and avoid unnecessary cell reselection and the object of cell merge.
For making the principle of technical solution of the present invention, feature and effect clearly, below by way of specific embodiment, the present invention program is elaborated further.
The embodiment of the present invention is only described for the gravity treatment of Macro community and Pico community.Figure 3 shows that and comprise the steps: a kind of cell re-selection procedure that the embodiment of the present invention provides
Step 301: the channel quality of the UE Monitoring Service community under idle condition and the adjacent cell of Serving cell.
Step 302: described UE judges whether the channel quality of Serving cell and adjacent cell meets cell re-selection conditions, if so, performs step 303, otherwise returns step 301.
When the difference of the channel quality and threshold value that meet adjacent cell is more than Q
hystcondition time, UE starts Treselection
rATtimer, if the channel quality of adjacent cell and the difference of threshold value are all the time more than Q before described timer expiry
hyst, then judge to meet cell re-selection conditions, other situations then judge not meet cell re-selection conditions; Described Q
hystand Treselection
rATby the parameter that broadcast is transmitted.
Step 303: judge whether potential reselection target cell is Pico community, if not Pico community (namely Target cell is still Macro community), performs step 305, if so, performs step 304.
Step 304:UE judges whether self is in high-speed moving state, if so, performs step 306, otherwise performs step 305.
UE under idle condition determines the mobile status of UE according to the number of times that cell reselection occurs in certain hour: UE adds up the number of times that cell reselection occurs for self, if at T
cRmaxin time, the number of times that cell reselection occurs UE is greater than the first threshold value but is less than the second threshold value, and so UE is in middling speed mobile status; If at T
cRmaxin time, the number of times that cell reselection occurs UE is greater than the second threshold value, and so UE is in high-speed moving state; In all the other situations, UE is in constant speed mobile status, T
cRmaxfor the parameter transmitted by broadcast.
Step 305:UE carries out normal cell reselection, and process ends.
Step 306:UE adjusts cell reselection parameters and realizes delaying cell reselection.According to discussion above, by increasing Q
hystand/or Treselection
rATvalue can realize delaying cell reselection.Particularly, delay cell reselection can pass through at Q
hystthe basis of original value adds one be greater than 0 weighted factor sf_1 and/or at Treselection
rATthe basis of original value is multiplied by a weighted factor sf_2 being greater than 1 to realize.Because the UE under idle condition can only receive broadcast, so eNB can transmit this weighted factor sf_1 and/or sf_2 by broadcast to UE, after UE receives broadcast, according to weighted factor sf_1 and/or sf_2 to Q
hystand/or Treselection
rATadjust, and carry out cell reselection according to the parameter after adjustment.
Figure 4 shows that and comprise the steps: the cell merge flow process that the embodiment of the present invention provides
Step 401: the channel quality of the UE Monitoring Service community under connection status and the adjacent cell of Serving cell.
Step 402:UE judges to detect whether the channel quality of Serving cell and adjacent cell meets event and trigger measurement report condition, if so, performs step 403, otherwise returns step 401.
When condition more than offset of the difference of the channel quality and threshold value that meet adjacent cell, UE starts timeToTrigger timer, if the channel quality of adjacent cell and the difference of threshold value are all the time more than offset before described timer expiry, then judge to meet to measure report condition, other situations then judge not meet measurement report condition; The parameter that described offset and timeToTrigger is transmitted by broadcast.
Step 403: judge whether potential switching target small area is Pico community.If so, perform step 404, otherwise perform step 405.
Step 404:UE judges whether self is in high-speed moving state, if so, performs step 406, otherwise performs step 405.
UE under connection status determines the mobile status of UE according to the number of times that cell merge occurs in certain hour: if at T
cRmaxin time, the number of times that UE switches is greater than the first threshold value but is less than the second threshold value, and so UE is in middling speed mobile status; If at T
cRmaxin time, the number of times that UE switches is greater than the second threshold value, and so UE is in high-speed moving state; In all the other situations, UE is in constant speed mobile status.
Step 405:UE carries out normal measurement and reports, and then performs step 407.
Step 406: adjustment handoff parameter realizes delaying measurement and reports.Particularly, delay to measure and report and can be greater than the weighted factor sf_3 of 0 by adding on the basis of the original value of offset one and/or on the basis of the original value of timeToTrigger, be multiplied by a weighted factor sf_4 being greater than 1 realize.UE under connection status can receive broadcast and RRC signaling, so eNB can transmit weighted factor sf_3 and sf_4 by broadcast or RRC signaling to UE.
Step 407: the measurement parameter that base station reports according to UE determines whether this UE is switched to Target cell.
The embodiment of the present invention switches to example only with Macro community and Pico community, and for the switching between Macro community and other types community (Femto community and Relay community), method of the present invention is applicable equally.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a residence reselecting, is characterized in that, comprises the steps:
The channel quality of the UE Monitoring Service community under A, idle condition and the adjacent cell of Serving cell, described Serving cell is macrocell;
B, described UE judge whether the channel quality of Serving cell and adjacent cell meets cell re-selection conditions, if so, perform step C, otherwise return steps A;
C, judge whether potential reselection target cell is macrocell, if so, performs step e, otherwise, perform step D;
D, UE judge that whether self is in high-speed moving state, if so, performs step F, otherwise perform step e;
E, UE carry out normal cell reselection, and process ends;
F, UE adjust cell reselection parameters and realize delaying cell reselection.
2. method according to claim 1, is characterized in that, UE described in step B judges whether the channel quality of Serving cell and adjacent cell meets cell re-selection conditions and comprise:
When the difference of the channel quality and threshold value that meet adjacent cell is more than Q
hystcondition time, UE starts Treselection
rATtimer, if the channel quality of adjacent cell and the difference of threshold value are all the time more than Q before described timer expiry
hyst, then judge to meet cell re-selection conditions, other situations then judge not meet cell re-selection conditions; Described Q
hystand Treselection
rATby the parameter that broadcast is transmitted.
3. method according to claim 1, is characterized in that, step D comprises:
UE adds up the number of times that cell reselection occurs for self, if at T
cRmaxin time, the number of times that cell reselection occurs UE is greater than the first threshold value but is less than the second threshold value, and so UE is in middling speed mobile status; If at T
cRmaxin time, the number of times that cell reselection occurs UE is greater than the second threshold value, and so UE is in high-speed moving state; In all the other situations, UE is in constant speed mobile status, T
cRmaxfor the parameter transmitted by broadcast.
4. method according to claim 2, is characterized in that, step F comprises: UE is by increasing Q
hystand/or Treselection
rATvalue realize delay cell reselection.
5. method according to claim 4, is characterized in that, step F comprises:
UE receiving package contains the broadcast of the first weighted factor sf_1 and/or the second weighted factor sf_2, by Q
hystadd that the first weighted factor sf_1 is as new Q
hystand/or by Treselection
rATbe multiplied by the second weighted factor sf_2 as new Treselection
rAT.
6. a cell switching method, is characterized in that, comprises the steps:
The channel quality of the UE Monitoring Service community under a, connection status and the adjacent cell of Serving cell, described Serving cell is macrocell;
B, described UE judge whether the channel quality of Serving cell and adjacent cell meets and measure report condition, if so, perform step c, otherwise return step a;
C, judge whether potential switching target small area is macrocell, if so, perform step e, otherwise, perform steps d;
D, UE judge whether self is in high-speed moving state, if so, perform step f, otherwise perform step e;
E, UE carry out normal measurement and report, and then perform step g;
F, UE adjustment measurement reports parameter to realize delaying measurement and reports;
G: the measurement parameter that base station reports according to UE determines whether this UE is switched to Target cell.
7. method according to claim 6, is characterized in that, UE described in step b judges whether the channel quality of Serving cell and adjacent cell meets measurement report condition and comprise:
When condition more than offset of the difference of the channel quality and threshold value that meet adjacent cell, UE starts timeToTrigger timer, if the channel quality of adjacent cell and the difference of threshold value are all the time more than offset before described timer expiry, then judge to meet to measure report condition, other situations then judge not meet measurement report condition; The parameter that described offset and timeToTrigger is transmitted by broadcast.
8. method according to claim 6, is characterized in that, steps d comprises:
UE adds up the number of times that cell merge occurs for self, if at T
cRmaxin time, the number of times that cell merge occurs UE is greater than the first threshold value but is less than the second threshold value, and so UE is in middling speed mobile status; If at T
cRmaxin time, the number of times that cell merge occurs UE is greater than the second threshold value, and so UE is in high-speed moving state; In all the other situations, UE is in constant speed mobile status, T
cRmaxfor the parameter transmitted by broadcast.
9. method according to claim 7, is characterized in that, step f comprises: UE realizes delaying measurement by the value increasing offset and/or timeToTrigger and reports.
10. method according to claim 9, is characterized in that, step f comprises:
Offset, containing the broadcast of the 3rd weighted factor sf_3 and/or the 4th weighted factor sf_4 or radio resource control RRC message, is added that the 3rd weighted factor sf_3 is as new offset and/or timeToTrigger is multiplied by the 4th weighted factor sf_4 as new timeToTrigger by UE receiving package.
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| CN201110339451.4A CN103096402B (en) | 2011-11-01 | 2011-11-01 | A kind of residence reselecting and a kind of cell switching method |
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| CN104519510B (en) * | 2013-09-30 | 2018-02-23 | ***通信集团北京有限公司 | A kind of optimization method and device of cell reselection parameters |
| CN104768192A (en) * | 2014-01-06 | 2015-07-08 | 中兴通讯股份有限公司 | Cell reselection method, device, cell parameter configuration method and device |
| CN105323829A (en) * | 2014-07-31 | 2016-02-10 | 中兴通讯股份有限公司 | Cell selection method, cell selection device, base station and terminal |
| CN106413016B (en) * | 2015-07-31 | 2019-10-25 | 展讯通信（上海）有限公司 | A kind of cell selection processing method and intelligent terminal |
| CN106470456B (en) * | 2015-08-14 | 2019-09-17 | 电信科学技术研究院 | A kind of method and terminal carrying out relay selection in network termination |
| CN110324864B (en) * | 2018-03-28 | 2020-09-25 | 大唐移动通信设备有限公司 | Data transmission method and device |
| CN110611581A (en) | 2018-06-15 | 2019-12-24 | 维沃移动通信有限公司 | Cell management method, terminal and network side equipment |
| CN112203361B (en) * | 2020-10-12 | 2023-02-28 | Oppo（重庆）智能科技有限公司 | Method and device for processing radio link failure, terminal and storage medium |
| CN116489722A (en) * | 2022-01-14 | 2023-07-25 | 维沃移动通信有限公司 | Cell reselection method, device, equipment, system and storage medium |
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