CN101965742A - Improved cell reselection in an mbsfn system - Google Patents
Improved cell reselection in an mbsfn system Download PDFInfo
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- CN101965742A CN101965742A CN2008801277264A CN200880127726A CN101965742A CN 101965742 A CN101965742 A CN 101965742A CN 2008801277264 A CN2008801277264 A CN 2008801277264A CN 200880127726 A CN200880127726 A CN 200880127726A CN 101965742 A CN101965742 A CN 101965742A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W72/30—Resource management for broadcast services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
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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
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Abstract
A method (200) for a cellular system (100) in which a first kind of transceiver (110, 115) provides a first kind of service and a second kind of transceiver (120, 125, 130,135, 140, 145) provides a second kind of service. Each of a number of said first kind of node (110, 115) has an association with one or more of said second kind of node (120, 125, 130,135, 140, 145), so that a user (105) who uses the first kind of service accesses the second kind of service through a node of the second kind which is associated with a node of the first kind. Users who use the first kind of service compare (205) signal strengths from transceiver nodes of the first kind (110,115) in order to decide (210) to perform reselection of said second kind of node (120, 125, 130,135, 140, 145).
Description
Technical field
The invention discloses a kind of method of cell reselection of carrying out in cellular communication system, in described cellular communication system, first kind transceiver node provides first kind service to the user, and the second class transceiver node provides the second class service to the user.
Background technology
In the cellular communication system that uses so-called TD SCDMA (TD SDMA access) principle, also there is the possibility of introducing so-called MBMS service (multimedia broadcast multicast services).The particular case of MBMS service is so-called MBSFN, i.e. MBMS on single-frequency.
In the system that uses MBSFN, specific cell (or more properly, the Control Node of these sub-districts) provides MBSFN service to the user, and use other sub-districts (or more properly, the Control Node of these sub-districts) to come " non-MBSFN " service (for example voice) to be provided or to provide system information or paging to the user to the user.
Each MBSFN sub-district has " umbrella " on a plurality of non-MBSFN sub-district in system, and the user who make to use the MBSFN service and maybe need to wish to visit non-MBSFN service uses the non-MBSFN sub-district that is associated with one of MBSFN sub-district in the system.
In other cellular systems, the user who has in the system of MBSFN and non-MBSFN sub-district may need to carry out the sub-district gravity treatment, promptly switches to the signal sub-district stronger than current area.In the system that the MBSFN service is provided to the user, the user may carry out " dual " gravity treatment, because the user capture different districts in the system obtains dissimilar service (being MBSFN and non-MBSFN).For non-MBSFN sub-district, with more frequent generation sub-district gravity treatment, because these sub-districts typically have the overlay area littler than MBSFN sub-district.
Summary of the invention
The purpose of this invention is to provide a kind of improving one's methods of sub-district gravity treatment of in system, carrying out, there are MBSFN sub-district and non-MBSFN sub-district in the described system, and a plurality of at least MBSFN sub-district has a plurality of non-MBSFN sub-district of " under its umbrella ", and promptly some or all MBSFN sub-districts have a plurality of non-MBSFN sub-district that is associated with it.Suitably, described method should be used for the system that like combinations was suitable for (although dual service can not be MBSFN and non-MBSFN) of dual service.
This method provided by the invention is: it discloses a kind of method of using in cellular communication system, in described cellular communication system, first kind transceiver node provides first kind service to the user, and the second class transceiver node provides the second class service to the user.
One or more being associated in a plurality of first kind nodes each and second category node makes and uses the user of first kind service to visit the second class service by second category node that is associated with first kind node.
The method according to this invention uses the user of first kind service that the signal strength signal intensity from first kind transceiver node is compared, with the gravity treatment of decision execution to described second category node.
Therefore, when the present invention is applied to have in the system of MBSFN sub-district and non-MBSFN sub-district, the user will use the signal strength signal intensity from the MBSFN sub-district, carry out gravity treatment to non-MBSFN sub-district with decision.For a variety of reasons, this is useful, and for example reason is: the MBSFN sub-district has than bigger overlay area, non-MBSFN sub-district, therefore compares with the situation of not carrying out aforesaid operations, does not need to carry out so frequently the sub-district gravity treatment.
In addition, because MBSFN sub-district and non-MBSFN sub-district operate on different frequency, and most of user once can only monitor a frequency, and therefore, if there is not the present invention, the user will be interrupted the MBSFN service with the signal strength signal intensity of monitoring from non-MBSFN sub-district.By the present invention, reduced this interruption, this is useful naturally for the user in having used system of the present invention.
Suitably, the method according to this invention, signal strength signal intensity is compared and determines to carry out gravity treatment and detect user which first kind node has highest signal strength to visit information from one of first kind node, be associated with first kind node to find out which second category node, make the user can carry out sub-district gravity treatment second category node that is associated with first kind node with highest signal strength with highest signal strength.
Be applied to have the system of MBSFN and non-MBSFN sub-district, this means if the user in the system detects from the ratio between the signal strength signal intensity of MBSFN sub-district makes the user should carry out the sub-district gravity treatment to non-MBSFN sub-district, the user has visit the non-MBSFN neighbor list of the MBSFN sub-district of highest signal strength, should select the non-MBSFN sub-district from which when carrying out gravity treatment to find out the user.
Yet, the invention also discloses other embodiment that are used for gravity treatment, and will be described below.
The invention also discloses a kind of transceiver that in system of the present invention, is used as user terminal.
Description of drawings
Hereinafter with reference to accompanying drawing the present invention is described in more detail, in the accompanying drawing:
Fig. 1 shows and can use system of the present invention, and
Fig. 2 shows the flow chart of the inventive method, and
Fig. 3 shows the block diagram of user terminal of the present invention.
Embodiment
Fig. 1 shows the general introduction that can use system 100 of the present invention.This system is TD SCDMA (TD SDMA access) system, wherein, the user can use so-called MBSFN service (being the MBMS (multimedia broadcast multicast services) on the single-frequency) and use " common " TD SCDMA service (i.e. " non-MBSFN " service).
In system 100, symbolically show a user 105 (being shown user equipment (UE)), although user's number certainly has very big change.
In system 100, come to provide MBSFN service to UE 105 by the Control Node (in Fig. 1, having reference marker 110 and 115) of two sub-districts (being shown sub-district 7 and sub-district 8).Also illustrate among Fig. 1, each MBSFN sub-district (or a plurality of this sub-district) can have a plurality of non-MBSFN sub-district that is associated with it, illustrates by two groups of sub-districts in Fig. 1, and every group under " umbrella " of one of MBSFN sub-district (being sub-district 7 and 8).Sub-district 1,2 and 3 is associated with sub-district 7, and sub-district 4,5 and 6 is associated with sub-district 8.
UE 105 can receive and make up the MBSFN transmission from these two sub-districts by the transmission with same MBMS sign indicating number from sub-district 7 and sub-district 8, although use different so-called scrambler and intermediate code (midamble) from the transmission of these two sub-districts.Yet if the user does not make up the signal from the MBSFN sub-district, and " only " monitors a plurality of MBSFN sub-district can visit the MBSFN sub-district with highest signal strength, also can use the present invention.
As mentioned above, sub-district 1-3 under " umbrella " of one of MBSFN sub-district and 4-6 right and wrong MBSFN sub-district, relation between the non-MBSFN sub-district that the MBSFN sub-district is associated with it is as follows: MBSFN service only is descending, that is, sub-district 7 and 8 Control Node receive the transmission from UE 105.
Therefore, if UE 105 wishes to use the service that is different from MBSFN, for example call out, then this calling must be carried out route via one of non-MBSFN sub-district.In addition, if UE needs for example system information of so-called neighbor cell list and so on, if perhaps UE need monitor paging from system, then these only (being sub-district 1-3 and 4-6) sends from non-MBSFN sub-district.
Correspondingly, if UE 105 should need to use non-MBSFN service, then between UE 105 that uses the MBSFN service and non-MBSFN sub-district, need to exist " link ", should be regarded as one of one of " belonging to " non-MBSFN sub-district and MBSFN sub-district by " link " expression UE 105.
In not using system of the present invention, following situation will take place: supposition UE makes up the MBSFN signal from sub-district 7 and 8, and 7 signal strength signal intensities that receive are better than 8 signal strength signal intensities that receive from the sub-district from the sub-district.At this moment, UE will set up the link with the Control Node of one of non-MBSFN sub-district 1-3 under 7 umbrellas of sub-district.In this example, suppose that the non-MBSFN sub-district of link that UE has it is sub-district 1.
Under the process of using in the TD SCDMA system that does not have the MBSFN service, UE 105 will periodically monitor the signal from peripheral cell, to determine whether the carrying out sub-district gravity treatment.Yet, if system provides MBSFN service, and UE 105 has utilized these services, then the MBSFN service will be transmitted on independent frequency, because UE once can only receive a transmission on the frequency, UE 105 must interrupt using the MBSFN service to carry out the measurement at gravity treatment with " common " TD SCDMA (" non-MBSFN ") at interval.This will cause the interruption of not expecting of MBSFN service.
The present invention proposes a kind of scheme,, can significantly reduce these interruptions: return UE 105 uses the MBSFN service from the transmission of MBSFN sub-district (being sub-district 7 and 8) by combination example once more by this scheme.
According to the present invention, in order to determine to carry out sub-district gravity treatment to its non-MBSFN sub-district, UE105 will measure the signal strength signal intensity of 7 and 8 signals (suitably, from the so-called pilot signal of these sub-districts, although other signals also can be used for this purpose) that receive from the sub-district.Because UE is at the signal of monitoring from MBSFN sub-district 7 and 8, this monitoring will can not be interrupted the MBSFN service.
Suppose that also UE 105 will make up from the MBSFN signal of two MBSFN sub-districts 7 and 8, but also set up the link of one of non-MBSFN sub-district to being associated with sub-district 7.When UE carries out signal strength measurement to sub-district 7 and 8,, then do not carry out further gravity treatment action as long as 7 signal strength signal intensities that receive surpass certain predetermined surplus of respective signal from another MBSFN sub-district (being sub-district 8) from the sub-district.
Yet, according to the present invention, if the difference in signal strength between MBSFN sub-district (being sub-district 7 and 8) changes, feasible signal from sub-district 8 becomes, and recently 7 signal is strong from the sub-district, then UE will carry out and measure need to determine whether non-MBSFN sub-district gravity treatment, and promptly whether UE should change it and have non-MBSFN sub-district to its link.Suitably, in special time period, should surpass from specific surplus of the signal of sub-district 7 or threshold value from the signal of sub-district 8.Difference in signal strength from the MBSFN sub-district can be expressed as difference or ratio.
As mentioned above, different with the prior art scheme carry out owing to be transmitted on the same carrier from the MBSFN of sub-district 7 and 8, the UE measure signal intensity with the operation that determines whether to carry out non-MBSFN sub-district gravity treatment will be not can interruption U E to the use of MBSFN service.Only when changing from the relation between the signal strength signal intensity of MBSFN sub-district, just need UE that non-MBSFN sub-district is monitored, with compare from the respective signal intensity of non-MBSFN sub-district, relatively seldom change from the relation between the signal strength signal intensity of MBSFN sub-district, because the MBSFN sub-district typically covers than bigger zone, non-MBSFN sub-district.
Therefore, according to the present invention, 8 signal strength signal intensities that receive surpass 7 signal strength signal intensities that receive from the sub-district if the measurement of UE indication is from the sub-district, and then UE will carry out the cell reselection process at non-MBSFN sub-district.Below will describe, this reuse adoption process can carry out by different way, but will comprise that suitably UE obtains so-called " neighbor list " from the strong MBSFN sub-district (being sub-district 8) of " newly ".
(being sub-district 8) obtains the mode of neighbor list from the MBSFN sub-district to the invention provides a kind of UE, and sub-district 8 is used for individual channel on the carrier frequency of MBSFN service and should tabulates and send as so-called system information in sub-district 8.In addition, in one embodiment of the invention, so-called paging is also sent by the MBSFN sub-district, has therefore also reduced the UE in the system and has interrupted the needs that service is monitored to MBSFN.
In this system, this neighbor list be comprise the information relevant with the non-MBSFN sub-district (i.e. sub-district under " umbrella " of sub-district 8) of sub-district 8 and for example the information of the data of these sub-districts (perhaps, more precisely the Control Node of these sub-districts) frequency of sending thereon and so in interior tabulation.UE 105 uses the neighbor list of sub-district 8 in its reuse adoption process.From recognizing different alternatives here, the present invention comprises these alternatives:
A) UE 105 only attempts reselecting to the non-MBSFN sub-district of sub-district 8 (promptly stronger MBSFN sub-district),
B) UE 105 trials are carried out gravity treatment in the non-MBSFN sub-district of the MBSFN sub-district (being sub-district 7 and 8) of " stronger " and " weak ".
Therefore, the foregoing description a) in, exist and change if which MBSFN sub-district to have more high signal intensity for, then UE 105 will always have new non-MBSFN sub-district; And at embodiment b) in, if having stronger signal with previous identical non-MBSFN sub-district (being one of umbrella non-MBSFN sub-district down of sub-district 7), then UE 105 can keep and previous identical non-MBSFN sub-district.
In addition, the invention discloses the multiple alternate ways that is used to design neighbor list.Can recognize, select which kind of alternate ways to be somewhat dependent upon to select above gravity treatment alternative a) or b) in which.
The alternate ways of design neighbor list is as follows:
1.MBSFN the neighbor list of sub-district comprises the information relevant with its MBSFN neighbours, and with the relevant information in non-MBSFN sub-district under the umbrella of this MBSFN sub-district.Therefore, in the example shown in Figure 1 and described above, the neighbor list of sub-district 7 will have the information relevant with sub-district 8 (MBSFN neighbours) and with the relevant information in sub-district 1,2 and 3 (the non-MBSFN sub-district under " umbrella " of sub-district 7).
2.MBSFN the neighbor list of sub-district comprises the information relevant with its MBSFN neighbours, and with the relevant information in non-MBSFN sub-district under the umbrella of this MBSFN sub-district, and with the relevant information in non-MBSFN sub-district under the umbrella of adjacent MBSFN sub-district.Therefore, in the example shown in Figure 1 and described above, the neighbor list of sub-district 7 will have the information relevant and the information relevant with sub-district 1,2 and 3 (as the non-MBSFN sub-district of sub-district 7) with sub-district 8 and with the relevant information in sub-district 4,5 and 6 (as the non-MBSFN sub-district of sub-district 8).
3.MBSFN the neighbor list of sub-district comprises the information relevant with the MBSFN neighbours of this sub-district, non-MBSFN sub-district sends neighbor list, this neighbor list have the information relevant with its non-MBSFN sub-district and with the current relevant information that is associated with which MBSFN sub-district in this sub-district.Therefore, in the example shown in Figure 1 and described above, the neighbor list of sub-district 7 will comprise and the relevant information in adjacent MBSFN sub-district (being sub-district 8), sub-district 1 (as the example of non-MBSFN sub-district) will send neighbor list, this neighbor list has the information relevant with sub-district 2-6, and sub-district 1 current information under the MBSFN of sub-district 7 umbrella.
Fig. 2 is the roughly flow chart of the step of method 200 of the present invention.Optional or alternative step shown in broken lines among Fig. 2.
As can be seen from the above description, method 200 expections of the present invention are used for cellular communication system, and in described cellular communication system, first kind transceiver node provides first kind service to the user, and the second class transceiver node provides the second class service to the user.
One or more being associated in a plurality of first kind nodes each and described second category node makes and uses the user of first kind service to visit the second class service by second category node that is associated with first kind node.As indication in the step 205, use the user of first kind service that the signal strength signal intensity from first kind transceiver node is compared, shown in step 210, to determine to carry out gravity treatment to second category node.
In one embodiment of the invention, signal strength signal intensity is compared and determines to carry out gravity treatment and detect which first kind node to have the user of highest signal strength in the information of step 215 visit from one of first kind node, be associated with first kind node to find out which second category node, make the user can carry out sub-district gravity treatment second category node that is associated with first kind node with highest signal strength with highest signal strength.
Alternatively, step 215 can be represented: signal strength signal intensity is compared and determine to carry out the information of the user capture of gravity treatment from one of first kind node, be associated with first kind node to find out which second category node, make the user can carry out sub-district gravity treatment second category node that is associated with one of first kind node.
In another alternative, step 215 can be represented: signal strength signal intensity is compared and determine to carry out the user capture of gravity treatment from the information of one of first kind node with one of second category node, be associated with first kind node to find out which second category node, make the user can carry out sub-district gravity treatment second category node that is associated with one of first kind node.
Shown in step 220, in one embodiment of the invention, the user can monitor simultaneously from the transmission more than a first kind node, making up these transmission, thereby improves first kind service.In this embodiment, shown in step 225, the user will compare from the signal strength signal intensity of the first kind node that its signal is made up, and carries out the gravity treatment to second category node in second category node that is associated with one of first kind node of monitoring as step 230 be shown in and user.
Fig. 3 shows the roughly block diagram of the assembly of the transceiver of the present invention 300 that is used as user terminal UE in using system of the present invention.
As shown in Figure 3, transceiver 300 comprises antenna 310, receiver 320, control device (for example microprocessor 330) and memory 340.Transceiver 300 uses assemblies 310,320,330,340 to visit from the first kind service of at least one first kind transceiver node and from the second class service of at least one second class transceiver node.Transceiver uses assembly 330 and 340, is used for when the service of the visit first kind signal strength signal intensity from first kind transceiver node being compared, with the gravity treatment of decision execution to the described second class transceiver node.
In one embodiment of the invention, assembly 310,320,330 is used to visit the information from the first kind node with highest signal strength, is associated with this first kind node to find out which second category node; Assembly 330,340 is used to carry out the sub-district gravity treatment to second category node that is associated with this first kind node.
In another embodiment of the present invention, assembly 310,320,330 and 340 is used for monitoring simultaneously the transmission from more than a first kind node; Assembly 330 and 340 is used to make up these transmission, to improve first kind service.In this embodiment, assembly 330 and 340 also is used for the signal strength signal intensity from the first kind node that its signal is made up is compared, and carries out gravity treatment to second category node with decision between second category node that one of first kind node of monitoring with the user is associated.
The invention is not restricted to the example of the embodiment shown in above description and the accompanying drawing, but can freely change within the scope of the appended claims.
Claims (15)
1. method (200) of in cellular communication system (100), using, in described cellular communication system, first kind transceiver node (110,115) provides first kind service to user (105), the second class transceiver node (120,125,130; 135,140,145) provide the second class service to the user, wherein, one or more (120,125,130 in each (110,115) in a plurality of described first kind nodes and described second category node; 135,140,145) be associated, make and use the user (105) of first kind service to visit the second class service by second category node that is associated with first kind node, described method (200) is characterised in that: use the user of first kind service that the signal strength signal intensity from first kind transceiver node (110,115) is compared (205), carry out described second category node (120,125,130 with decision (210); 135, gravity treatment 140,145).
2. method according to claim 1 (200), wherein, described signal strength signal intensity is compared and determines to carry out gravity treatment and detect which first kind node (110,115) to have the information of user (105) visit (215) of highest signal strength from one of first kind node, to find out which second category node (120,125,130; 135,140,145) be associated, make user (105) can carry out sub-district gravity treatment second category node that is associated with first kind node with highest signal strength with first kind node with highest signal strength.
3. method according to claim 1 (200) wherein, compares and determines to carry out the information of user (105) visit (215) of gravity treatment from one of first kind node to described signal strength signal intensity, to find out which second category node (120,125,130; 135,140,145) be associated, make user (105) can carry out sub-district gravity treatment second category node that is associated with one of first kind node with first kind node.
4. method according to claim 1 (200), wherein, described signal strength signal intensity is compared and determines to carry out user (105) visit (215) of gravity treatment from the information of one of first kind node with one of second category node, to find out which second category node (120,125,130; 135,140,145) be associated, make user (105) can carry out sub-district gravity treatment second category node that is associated with one of first kind node with first kind node.
5. according to each described method (200) among the claim 1-4, wherein, user (105) monitors simultaneously from the transmission more than a first kind node (110,115), and combination (220) these transmission, to improve first kind service; Wherein, the user compares (225) to the signal strength signal intensity from the first kind node that its signal is made up, and carries out between second category node that one of first kind node of monitoring with the user is associated second category node (120,125,130 with decision (230); 135, gravity treatment 140,145).
6. according to each described method (200) among the claim 1-5, wherein, the signal strength signal intensity of using in order to carry out the sub-district gravity treatment from first kind node is the signal strength signal intensity of signal specific, and described signal specific is a pilot signal.
7. according to each described method (200) among the claim 2-6, wherein, described information is the neighbor list that comprises the information relevant with the first and/or second class neighbor cell.
8. according to each described method (200) among the claim 1-7, wherein, described method is applied to the system that first kind service is multimedia broadcast multicast services single carrier MBSFN (100).
9. according to each described method (200) among the claim 1-8, wherein, it is the system (100) that TD SDMA inserts TD SCDMA that described method is applied to the second class service.
10. user terminal (300) that in cellular communication system (100), uses, described terminal (300) is equipped with and is used for visit from the first kind service of at least one first kind transceiver node (110,115) with from least one second class transceiver node (120,125,130; The device (310,320,330,340) of second class service 135,140,145), described user terminal is characterised in that described user terminal comprises: be used for will comparing from the signal strength signal intensity of described first kind transceiver node with the device (330,340) of decision execution to the gravity treatment of the described second class transceiver node when the service of the visit first kind.
11. terminal according to claim 10 (300) is equipped with: be used to visit information, to find out the device (310,320) which second category node is associated with this first kind node from first kind node with highest signal strength; And be used to carry out device (330,340) to the sub-district gravity treatment of second category node that is associated with this first kind node.
12. according to claim 10 or 11 described terminals (300), be equipped with: be used for monitoring simultaneously from device (310,320,330,340), and be used to make up these transmission to improve the device (330,340) of first kind service more than the transmission of a first kind node; Described terminal (300) also is equipped with: be used for the signal strength signal intensity from the first kind node that its signal is made up is compared, carry out device (330,340) to the gravity treatment of second category node with decision between second category node that one of first kind node of monitoring with the user is associated.
13. according to each described terminal (300) among the claim 10-12, wherein, the signal strength signal intensity from first kind node that is used to determine to carry out the sub-district gravity treatment is the signal strength signal intensity of signal specific, described signal specific is a pilot signal.
14. according to each described terminal (300) among the claim 10-13, wherein, first kind service is multimedia broadcast multicast services single carrier MBSFN.
15. according to each described terminal (300) among the claim 10-14, wherein, the second class service is that TD SDMA inserts TD SCDMA.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SE2008/000192 WO2009113918A1 (en) | 2008-03-12 | 2008-03-12 | Improved cell reselection in an mbsfn system |
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| CN101965742A true CN101965742A (en) | 2011-02-02 |
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| CN2008801277264A Pending CN101965742A (en) | 2008-03-12 | 2008-03-12 | Improved cell reselection in an mbsfn system |
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| WO (1) | WO2009113918A1 (en) |
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| TWI457019B (en) * | 2011-04-02 | 2014-10-11 | Alcatel Lucent | Method and device for performing cell reselection |
| CN102833800A (en) * | 2011-06-16 | 2012-12-19 | 中兴通讯股份有限公司 | Cell switching method and device |
| CN102833800B (en) * | 2011-06-16 | 2017-03-29 | 中兴通讯股份有限公司 | Cell switching method and device |
Also Published As
| Publication number | Publication date |
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| WO2009113918A1 (en) | 2009-09-17 |
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