CN101562835A - Method for switching terminal among heterogeneous hierarchical distributing type base stations - Google Patents
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Abstract
The invention provides a method for switching a terminal among heterogeneous hierarchical distributing type base stations, comprising the steps: the terminal reports the measurement of a signal of a macrocell and the measurement of a signal of a microcell to a network; the network judges whether the terminal needs to be switched among the distributing type base stations or not according to the measurement reported by the terminal and a preset decision threshold; if the terminal needs to be switched among the distributing type base stations, the network confirms a duplex mode after terminal switch according to an available frequency spectrum resource of the target base station; the network transmits a switching control command to the terminal and carries the duplex mode after switch; and the terminal is switched according to the switching control command transmitted by the network. By using the invention, the terminal can be freely switched among the heterogeneous hierarchical distributing type base stations according to the use condition and a terminal state of network resources.
Description
Technical field
The present invention relates to the wireless access network technology in the communication network, relate in particular to the implementation method that a kind of terminal is switched between heterogeneous hierarchical distributing type base stations.
Background technology
The handoff technique of layering wireless access network in the past can be divided into layer two base class of the vertical switching with interlayer of interior parallel switching, because parallel switching can realize with traditional changing method in the layer of layering wireless access network, therefore, the handoff technique of existing layer-specific access net mainly is to solve the vertical switching problem of interlayer.
Chinese patent application CN1503580 number discloses portable terminal dispatching method in a kind of hierarchical cellular system in 2004.06.09, at first the speed of terminal is measured; If terminal is in high-speed moving state, judge whether that more high-rise sub-district is covered with current area, if having, terminal is switched to more high-rise Target cell; If terminal is in the low speed mobile status, judge whether that more the sub-district of low layer is covered by current area, if having, terminal is switched to more low layer Target cell; If terminal is in the middling speed mobile status, terminal is retained in the current area.Adopt this invention, can the minimizing system in switching times, thereby improve the communication quality of system and the stability of system, also reduce system cost simultaneously.
Chinese patent application CN1859726 number discloses the implementation method that a kind of user terminal switches in 2006.11.08 in floored community, comprising: obtain the user terminal translational speed and determine that according to the translational speed of obtaining the floored community that user terminal is fit to is Microcell or macrocell; If the current place of user terminal floored community and the floored community that is fit to layer together then do not switch; Otherwise, further obtain the load of Target cell and according to the load judgment Target cell that obtains receivability user terminal whether, if receivability is then controlled user terminal and switched to Target cell; Otherwise, do not switch.This invention can obviously improve the load balanced condition of floored community, and then can improve the communication quality of user terminal, and improves user satisfaction.
In recent years, in order to reduce the complexity of the mobile management that Microcell produces when supporting portable terminal, a kind of control and the professional layer architecture that is separated have appearred.Chinese patent application discloses a kind of solution of hierarchical cellular radio communications system for CN1528098 number in 2004.09.08, this system comprises a umbrella macrocell and a plurality of Microcells that covered by this macrocell, and each macrocell and Microcell comprise a controlling center.A secondary (terminal) has a communication channel of system communication therewith, and it is divided into the control subchannel that is used for control information transmission and is used for the subchannel data of transmitting user data.The control subchannel is connected to the main website that serves macrocell with secondary (terminal), and subchannel data is connected to secondary (terminal) main website of service Microcell.The control section of described channel is mainly served by the umbrella macrocell, thereby reduces frequent mobile management expense, and data division is mainly served by the Microcell that can support high data rate and big packing density.
In addition, follow the development of multi-network cooperative gathering of frequency spectrum to occur, such as, by FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) remote radio unit RRU (Remote RadioUnit), TDD (Time Division Duplex, time division duplex) remote radio unit, in the layering wireless access network that the heterogeneous hierarchical distributing type base stations that FDD/TDD synthetical baseband unit is formed is formed, existing paired frequency spectrum, non-paired frequency spectrum is arranged again, not only can realize separating of Traffic Channel and control channel, can also realize further controlling more flexibly with professional be separated mix duplex mode.Under a kind of like this technical background, the switching mode of terminal will be more versatile and flexible in the layering wireless access network.
Above-described Chinese patent application CN1503580 number all is vertical switching of discussing of interlayer with CN1859726 number, does not consider how to realize the switching problem of terminal between macrocell under the control channel of terminal and the situation that Traffic Channel is connected respectively to macrocell and Microcell.
Above-described Chinese patent application has provided a kind of method that the control channel and the Traffic Channel of terminal are connected respectively to macrocell and Microcell for CN1528098 number, but, this technology is not given under such linking relationship, how to realize the switching of terminal between macrocell.Particularly by FDD remote radio unit RRU_FDD, TDD remote radio unit RRU_TDD, in the layering wireless access network that the heterogeneous hierarchical distributing type base stations that FDD/TDD synthetical baseband unit is formed is formed, existing paired frequency spectrum, non-paired frequency spectrum is arranged again, not only can realize separating of Traffic Channel and control channel, can also realize further controlling more flexibly with professional be separated mix duplex mode, this causes following switching of portable terminal between distributed base station more flexible, to cause the appearance of new handoff technique, also need when implementing to switch, take all factors into consideration more system requirements, but, lack the technical scheme of this respect at present.
Summary of the invention
The technical problem to be solved in the present invention is to propose the changing method of a kind of terminal between heterogeneous hierarchical distributing type base stations, according to the state of the operating position and the terminal of Internet resources, realizes flexible and efficient use to frequency spectrum with switching mode flexibly.
In order to solve the problems of the technologies described above, the present invention proposes the changing method of a kind of terminal between heterogeneous hierarchical distributing type base stations, described heterogeneous hierarchical distributing type base stations comprises macrocell radio node and Microcell radio node, wherein the radio node of macrocell is worked in the FDD mode, the radio node of Microcell is worked in the TDD mode, and in a macrocell, there are several Microcells, it is characterized in that, may further comprise the steps:
A, terminal report the measuring amount of macrocell signal and the measuring amount of Microcell signal to network;
The measuring amount of b, network based terminal to report and the decision threshold that is provided with in advance judge whether and need carry out switching between distributed base station to terminal;
C, if desired terminal is carried out switching between distributed base station, the usable spectrum resource of network based target BS is determined the terminal duplex mode after switch;
D, network issue the switching controls order to terminal, carry described duplex mode after switch;
E, terminal are switched according to the switching controls order that network issues.
Further, above-mentioned changing method also can have following characteristics:
The method of obtaining the measuring amount of described macrocell signal among the step a is: terminal is carried out the signal power that signal power measurement obtains relevant macrocell according to the adjacent cell list of the service macrocell that network issues to service macrocell and adjacent sub-district thereof;
The method of obtaining the measuring amount of described Microcell signal among the step a is: terminal is carried out the signal power that signal power measurement obtains relevant Microcell according to the adjacent cell list of the service Microcell that network issues to service Microcell and adjacent sub-district thereof.
Further, above-mentioned changing method also can have following characteristics:
The signal power of described macrocell is to cover the reference symbol received power RSRP of radio node emission of macrocell as the measuring amount of terminal to macrocell;
The signal power of described Microcell is to cover the reference symbol received power RSRP of radio node emission of Microcell as the measuring amount of terminal to Microcell.
Further, above-mentioned changing method also can have following characteristics:
Described RSRP is the mean value of the reference symbol power that measures in several wireless sub-frames of terminal.
Further, above-mentioned changing method also can have following characteristics:
Terminal also carries out reporting network after the Filtering Processing to described RSRP.
Further, above-mentioned changing method also can have following characteristics:
Specifically comprise among the described step b: before terminal is switched, be the FDD duplex mode, use FDD judgement principle to judge whether to need terminal is carried out switching between distributed base station that it is switch decision principle between the FDD system cell that described FDD adjudicates principle;
Whether before terminal is switched be the TDD duplex mode, use the judgement of TDD judgement principle to need terminal is carried out switching between distributed base station, and it is switch decision principle between the TDD system cell that described TDD adjudicates principle; Or
Before terminal is switched duplex state be professional with control be separated mix duplex state SCS-HDD, adopt SCS-HDD judgement principle, the switch decision that is about to control channel carries out according to FDD judgement principle, and the switch decision of Traffic Channel carries out according to TDD judgement principle.
Further, above-mentioned changing method also can have following characteristics:
Described SCS-HDD judgement principle is also according to practical application, when the control channel of terminal and Traffic Channel all need to switch, carry out the switching between distributed base station, or the control channel of terminal and Traffic Channel any one just carry out switching between distributed base station need switch the time.
Further, above-mentioned changing method also can have following characteristics:
Described step c also comprises step:
C1, network notice terminal are obtained the Base Station Identification ID of target BS;
C2, serving BS utilize the base station IDs of target BS to judge target BS usable spectrum resource information, determine the current duplex mode that can provide for terminal of target BS according to its usable spectrum resource information;
C3, network select a kind of as the terminal duplex mode after switch from the current duplex mode that can provide for terminal of target BS.
Further, above-mentioned changing method also can have following characteristics:
The usable spectrum resource of obtaining described in the step c is paired frequency spectrum, and network is that terminal specifies the FDD duplex mode as the terminal duplex mode after switch; Or the usable spectrum resource of obtaining described in the step c is non-paired frequency spectrum, and network is that terminal specifies the TDD duplex mode as the terminal duplex mode after switch.
Further, above-mentioned changing method also can have following characteristics:
Also comprise after the step e: terminal after switching to target BS according to duplex mode work after the switching that indicates in the switching controls order;
After the resource of target BS or the state of terminal changed, target BS then changed the duplex mode of terminal as the case may be.
The changing method of terminal of the present invention between heterogeneous hierarchical distributing type base stations, can be according to the state of the operating position and the terminal of Internet resources, with the flexible and efficient use of switching mode realization flexibly, thereby improve handover success rate and professional stability to frequency spectrum.
Description of drawings
The communication system that Fig. 1 switches between 2 heterogeneous hierarchical distributing type base stations for a kind of terminal.
The flow chart that Fig. 2 switches between heterogeneous hierarchical distributing type base stations for a kind of terminal.
Fig. 3 switches to the FDD node of target BS and the handoff procedure schematic diagram of TDD node to the control channel of terminal and Traffic Channel respectively for a kind of.
Fig. 4 is a kind of handoff procedure schematic diagram that the control channel of terminal and Traffic Channel is all switched to the FDD node of target BS.
Fig. 5 is a kind of handoff procedure schematic diagram that the control channel of terminal and Traffic Channel is all switched to the TDD node of target BS.
Embodiment
Below in conjunction with drawings and the specific embodiments to the detailed description of the invention.
Be illustrated in figure 1 as the communication system that a terminal is switched between two heterogeneous hierarchical distributing type base stations (also can be more multi-segment heterogeneous distributed base station), wherein each heterogeneous hierarchical distributing type base stations comprises a macrocell layer and a microcell level, radio node in the macrocell layer is worked in the FDD mode, and the radio node in the microcell level is worked in the TDD mode.The macrocell layer of heterogeneous hierarchical distributing type base stations A comprises 1 radio node 101a that macrocell 102a is covered; And comprise the radio node 103a that several cover Microcell 104a.Described heterogeneous hierarchical distributing type base stations A also comprises Base-Band Processing and control unit 105a, is used for the radio node 101a of macrocell 102a and the radio node 103a of Microcell 104a are carried out Base-Band Processing and control.Base-Band Processing and control unit 105a and radio node 101a and with radio node 103a between communicate by letter and realize according to public open wireless interfacing of the prior art or standard, such as, use CPRI (Common Public Radio Interface) SpecificationV3.0 (2006-10-20) standard interface to realize.Heterogeneous hierarchical distributing type base stations B is identical with the A structure.In the zone that the heterogeneous hierarchical wireless access network that heterogeneous hierarchical distributing type base stations A forms covers, also there is at least one wireless terminal 107, this wireless terminal have with macrocell and Microcell in the ability that communicates of radio node (101a, 101b, 103a, 103b), comprise: communicate with 3GPP LTE (Long TermEvolution, Long Term Evolution) FDD mode and macrocell radio node 101a or 101b; Communicate with 3GPP LTE TDD mode and Microcell radio node 103a or 103b; With professional with control be separated mix duplex mode and radio node 101a and 103a, perhaps communicate with radio node 101b and 103b.Wireless terminal 107 use professional with control mixing in the process that duplex mode and radio node 101a and 103a communicate of being separated, Microcell 104a/104b with on the time division duplex carrying wireless terminal/downlink service data, macrocell 102a/102b is used for carrying and transmits the needed control data of described/downlink service data.
Be the changing method of example explanation terminal between heterogeneous hierarchical distributing type base stations with communication system shown in Figure 1 below:
, may further comprise the steps for realizing the flow chart of the changing method between heterogeneous hierarchical distributing type base stations of the present invention as Fig. 2:
Step S200: terminal reports the measuring amount of macrocell signal and the measuring amount of Microcell signal to network;
Wireless terminal 107 carries out signal power measurement according to the adjacent cell list of the service macrocell that network issues to service macrocell and adjacent sub-district thereof, obtain the signal power of related cell, such as obtaining radio node 101a among Fig. 1 and signal power Power_101a and the Power_101b of radio node 101b, and measurement result Power_101a and Power_101b are reported network.
In order to obtain to serve the signal power of macrocell and adjacent sub-district, a kind of method be terminal the reference symbol received power RSRP (Reference Symbol Received Power) of macrocell radio node 101a and macrocell radio node 101b emission as measuring amount (Power_101a and Power_101b).In order to make the measuring amount that obtains more accurate, terminal can also carry out reporting network again after the Filtering Processing to RSRP;
Terminal is carried out signal power measurement according to the adjacent cell list of the service Microcell that network issues to service Microcell and adjacent Microcell thereof, obtain the signal power of related cell, such as obtaining radio node 103a among Fig. 1 and signal power Power_103a and the Power_103b of radio node 103b, and measurement result Power_103a and Power_103b are reported network;
In order to obtain to serve the signal power of Microcell and adjacent Microcell thereof, a kind of method be terminal the reference symbol received power RSRP of Microcell radio node 103a and Microcell radio node 103b emission as measuring amount (Power_103a and Power_103b).In order to make the measuring amount that obtains more accurate, terminal can also carry out reporting network again after the Filtering Processing to RSRP.
It is that the received power of the reference symbol that measures in several wireless sub-frames (wireless sub-frame is 1ms) is averaged and obtained that terminal is carried out a RSRP measurement.
In another embodiment, terminal to the described measuring amount that network reports can also be: RSRP described in first embodiment is further calculated propagation path loss, determine whether to switch by the propagation path loss of contrast terminal to the different districts base station; Or
Determine whether to switch by measurement to the adjacent sub-district and the signal power of this sub-district synchronizing channel or broadcast channel.
Step S210: the measuring amount of network based terminal to report and the decision threshold that is provided with in advance judge whether and need carry out switching between distributed base station to terminal;
At first, be respectively macrocell measuring amount and Microcell measuring amount and set decision threshold;
For the macrocell measuring amount is set two decision thresholds: macrocell available signal poker thresholding Tr_mac; The difference DELTA Tr_mac of macrocell Serving cell signal power cell signal power adjacent with it;
For the Microcell measuring amount is set two decision thresholds: Microcell available signal poker thresholding Tr_mic; The difference DELTA Tr_mic of Microcell Serving cell signal power cell signal power adjacent with it.
Current according to terminal then duplex state, adopt respectively as the principle that acts judges whether and need carry out switching between distributed base station to terminal:
If duplex state is FDD before the switching of terminal, then adopt FDD judgement principle.The judgement principle of switching between this principle and traditional FDD system cell is identical, such as, the measuring amount cell signal power adjacent of macrocell Serving cell signal power with it the difference and the threshold delta Tr_mac of measuring amount compare, if described difference is greater than Δ Tr_mac, just trigger and switch, otherwise, stop this handoff process;
If duplex state is TDD before the switching of terminal, then adopt TDD judgement principle.The judgement principle of switching between this principle and traditional TDD system cell is identical, such as, the Microcell signal power adjacent in the measuring amount of Microcell Serving cell signal power and this Microcell place macrocell with this service Microcell the difference and the threshold delta Tr_mic of measuring amount compare, if described difference is greater than Δ Tr_mic, just trigger and switch, otherwise, stop this handoff process;
If before the switching of terminal duplex state be professional and control be separated mix duplex SCS-HDD (Service-and-Control-Separation based Hybrid Division Duplex), then adopt SCS-HDD to adjudicate principle.SCS-HDD needing to determine whether switching by the analysis-by-synthesis to Tr_mac, Δ Tr_mac and Tr_mic, Δ Tr_mic.The switch decision of SCS-HDD carries out comprehensive on the basis of following two judgement principles: the switch decision of control channel carries out according to FDD judgement principle; The switch decision of the Traffic Channel of SCS-HDD carries out according to TDD judgement principle.In actual should using, according to factors such as cell loads, the switch decision of SCS-HDD can be chosen neatly when the control channel that has only terminal and Traffic Channel all need to switch and just switch; Just switch when perhaps any one need switch when the control channel of terminal and Traffic Channel.
No matter use any SCS-HDD switch decision principle,, just trigger and switch in case satisfy switching principle, otherwise, this handoff process stopped.
Step S220: network is provided by the current duplex mode that can provide for terminal of target BS;
Described target BS is: the maximum adjacent base station of the RSRP value that serving BS reports terminal to network is as target BS.
At first, network notice terminal obtain target BS Base Station Identification (ID, Identity).
The base station sign of the target BS that terminal is obtained issues by network, its mode that issues can have multiple mode, for example: terminal is carried out in the process of Cell searching, and network is represented the ID of a specific sub-district or base station and it is handed down to terminal by the combination of coded sequence specific on the synchronizing channel; Perhaps issue ID number of its neighbor cell to terminal by base station in service sector, be adjacent mapping relations between the sign indicating number sequence of synchronizing channel of sub-district for this ID number, the sign indicating number sequence that has one group of sub-district is handed down to terminal, through determining finally to be chosen as the ID of Target cell behind the terminal searching.
Then, the serving BS of terminal utilizes target BS ID to obtain its usable spectrum resource information from target BS by the communication interface between the base station, and the usable spectrum of the target BS that serving BS obtains has following several possibility:
First kind of resource status of target BS: the paired frequency spectrum of target BS and non-paired frequency spectrum are all available.In this case, target BS can provide any in FDD, TDD, these three kinds of duplex modes of SCS-HDD for terminal.Which kind of duplex mode is terminal use determine at step S230.
Second kind of resource status of target BS: target BS has only paired frequency spectrum to use.In this case, target BS can only provide FDD duplex mode for terminal.
The third resource status of target BS: target BS has only non-paired frequency spectrum to use.In this case, target BS can provide TDD duplex mode for terminal.
If target BS does not have the available spectrum resource, the then switching of terminating terminal.
Step S230: network is provided from the current duplex mode that can provide for terminal of target BS by duplex mode after a kind of suitable switching;
If the target BS that step S220 obtains is first kind of resource status, then network can be specified any as its duplex mode after switch in FDD, TDD, these three kinds of duplex modes of SCS-HDD for terminal.The most direct method is still to switch preceding duplex mode as this terminal duplex mode after switch for its designated terminal.Further, in order to reach utilization of resources effect preferably, network can be done further selection according to the class of business and the translational speed of terminal, such as, for the terminal of high-speed mobile and reception non-symmetrical service, for it specifies SCS-HDD as its duplex mode after switch;
If the target BS that step S220 obtains is second kind of resource status, then network can only specify the FDD duplex mode as the terminal duplex mode after switch for terminal;
If the target BS that step S220 obtains is the third resource status, then network can only specify the TDD duplex mode as the terminal duplex mode after switch for terminal.
Step S240: network issues the switching controls order to terminal;
Initial duplex mode network indicates terminal and switches to target BS in the switching controls order after.
Terminal after switching to target BS according to the initial duplex mode work that indicates in the switching controls order.But, after the state of the resource of target BS or terminal changes, target BS can change the duplex mode of terminal as the case may be, for example:, then need to switch to the TDD duplex mode and get on to use the TDD frequency spectrum after the shortage of FDD frequency spectrum according to the terminal of FDD duplex mode work; Perhaps according to the terminal of FDD duplex mode work when the high-speed moving state conversion is as the criterion inactive state, in order to save the FDD frequency spectrum, then need to switch to the TDD duplex mode and get on to use the TDD frequency spectrum.
Step S250: terminal is switched according to the control command that network issues.
Concrete switching mode has 3 kinds:
Be illustrated in figure 3 as the switching that the control channel of terminal and Traffic Channel is switched to the FDD node and the TDD node of target BS respectively;
Be illustrated in figure 4 as the switching that the control channel of terminal and Traffic Channel is all switched to the FDD node of target BS;
Be illustrated in figure 5 as the switching that the control channel of terminal and Traffic Channel is all switched to the TDD node of target BS.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, the changing method of a kind of terminal between heterogeneous hierarchical distributing type base stations, described heterogeneous hierarchical distributing type base stations comprises macrocell radio node and Microcell radio node, wherein the radio node of macrocell is worked in the FDD mode, the radio node of Microcell is worked in the TDD mode, and in a macrocell, there are several Microcells, it is characterized in that, may further comprise the steps:
A, terminal report the measuring amount of macrocell signal and the measuring amount of Microcell signal to network;
The measuring amount of b, network based terminal to report and the decision threshold that is provided with in advance judge whether and need carry out switching between distributed base station to terminal;
C, if desired terminal is carried out switching between distributed base station, the usable spectrum resource of network based target BS is determined the terminal duplex mode after switch;
D, network issue the switching controls order to terminal, carry described duplex mode after switch;
E, terminal are switched according to the switching controls order that network issues.
2, changing method as claimed in claim 1 is characterized in that:
The method of obtaining the measuring amount of described macrocell signal among the step a is: terminal is carried out the signal power that signal power measurement obtains relevant macrocell according to the adjacent cell list of the service macrocell that network issues to service macrocell and adjacent sub-district thereof;
The method of obtaining the measuring amount of described Microcell signal among the step a is: terminal is carried out the signal power that signal power measurement obtains relevant Microcell according to the adjacent cell list of the service Microcell that network issues to service Microcell and adjacent sub-district thereof.
3, changing method as claimed in claim 2 is characterized in that:
The signal power of described macrocell is to cover the reference symbol received power RSRP of radio node emission of macrocell as the measuring amount of terminal to macrocell;
The signal power of described Microcell is to cover the reference symbol received power RSRP of radio node emission of Microcell as the measuring amount of terminal to Microcell.
4, changing method as claimed in claim 3 is characterized in that:
Described RSRP is the mean value of the reference symbol power that measures in several wireless sub-frames of terminal.
5, as claim 3 or 4 described changing methods, it is characterized in that:
Terminal also carries out reporting network after the Filtering Processing to described RSRP.
6, changing method as claimed in claim 1 is characterized in that, specifically comprises among the described step b:
Whether before terminal is switched be the FDD duplex mode, use the judgement of FDD judgement principle to need terminal is carried out switching between distributed base station, and it is switch decision principle between the FDD system cell that described FDD adjudicates principle;
Whether before terminal is switched be the TDD duplex mode, use the judgement of TDD judgement principle to need terminal is carried out switching between distributed base station, and it is switch decision principle between the TDD system cell that described TDD adjudicates principle;
Before terminal is switched duplex state be professional with control be separated mix duplex state SCS-HDD, adopt SCS-HDD judgement principle, the switch decision that is about to control channel carries out according to FDD judgement principle, and the switch decision of Traffic Channel carries out according to TDD judgement principle.
7, changing method as claimed in claim 6 is characterized in that:
Described SCS-HDD judgement principle is also according to practical application, when the control channel of terminal and Traffic Channel all need to switch, carry out the switching between distributed base station, or the control channel of terminal and Traffic Channel any one just carry out switching between distributed base station need switch the time.
8, changing method as claimed in claim 1 is characterized in that, described step c is further comprising the steps of:
C1, network notice terminal are obtained the Base Station Identification ID of target BS;
C2, serving BS utilize the base station IDs of target BS to judge target BS usable spectrum resource information, determine the current duplex mode that can provide for terminal of target BS according to its usable spectrum resource information;
C3, network select a kind of as the terminal duplex mode after switch from the current duplex mode that can provide for terminal of target BS.
9, as claim 1 or 8 described changing methods, it is characterized in that:
The usable spectrum resource of obtaining described in the step c is paired frequency spectrum, and network is that terminal specifies the FDD duplex mode as the terminal duplex mode after switch; Or the usable spectrum resource of obtaining described in the step c is non-paired frequency spectrum, and network is that terminal specifies the TDD duplex mode as the terminal duplex mode after switch.
10, changing method as claimed in claim 1 is characterized in that, also comprises after the step e:
Terminal after switching to target BS according to duplex mode work after the switching that indicates in the switching controls order;
After the resource of target BS or the state of terminal changed, target BS then changed the duplex mode of terminal as the case may be.
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