CN101064920B - Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell - Google Patents
Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell Download PDFInfo
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- CN101064920B CN101064920B CN200610060541A CN200610060541A CN101064920B CN 101064920 B CN101064920 B CN 101064920B CN 200610060541 A CN200610060541 A CN 200610060541A CN 200610060541 A CN200610060541 A CN 200610060541A CN 101064920 B CN101064920 B CN 101064920B
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Abstract
A method to realize interval switch in TD-SCDMA multi-frequent dot section is disclosed, the terminal station detects the receiving power of P-CCPCH in service section and adjacent sections, and evaluates the signal-to-noise ratio of service channel based on the receiving power of P-CCPCH; and decide to switch according to the state of signal-to-noise ratio. The invention uses the characteristics of TD-SCDMA multi-frequent dot section, and the wireless source of TD-SCDMA is divided by time, and the co-frequency interference are produced on the boundary of honeycomb section, it can reduce the co-frequency interference effectively to ensure the communication quality when the mobile user does interval switch.
Description
Technical field
The present invention relates to field of wireless communication, relate to the method for handover in the TD-SCDMA cellular network particularly.
Background technology
Beehive net is the modal networking modes of wireless telecommunications, and network topology structure as shown in Figure 1.Because network topology structure exactly likes honeycomb structure, Cellular Networks hence obtains one's name.Each cellular unit is represented the coverage of a base station transceiver in the Cellular Networks, and radio communication chain circuit can be set up with the base station in the terminal station in this zone.A plurality of transceivers are formed network, realize the continuous covering of a panel region, for user terminal station provides immanent, continuous wireless communication services.
Fig. 2 provides typical cellular radio communication system framework.Typical wireless cellular communication system generally includes base station system and (comprises base station controller 21 and base station 11,12,13; Or base station controller 22 and base station 14,15,16) and 5 two parts of core net.Base station system and user terminal are set up communication link aloft, finish the two-way transmission of voice, data message; Business datum (voice or data) inserts public network by core net 5, as PSTN network or Internet network.Core net 5 also is responsible for finishing to functions such as the authentication of validated user and mobile roaming controls.Base station system comprises base station transceiver 11,12,13/14,15,16 and base station controller 21/22.In time-division multiple address system, all base station transceivers require synchronously, and are for example synchronous with gps system.Each base station controller 21/22 all has the Operation and Maintenance interface, is used for attended operation maintenance module 31/32.In network topological diagram, operating maintenance module 31/32 is as the centrostigma of single base station system, can set up the route of communicating by letter with a plurality of base station transceivers, finishes functions such as the data configuration of administration base station system and plant maintenances.For the network that disposes a plurality of base station controllers, then dispose a plurality of operating maintenance module 31/32 of regional Operation and Maintenance control desk 4 administrations.In network topological diagram, area Operation and Maintenance control desk 4 is as the centrostigma of a plurality of base station systems, can set up the route of communicating by letter with all base station transceivers under a plurality of base station systems, finish functions such as the data configuration of a plurality of base station systems of being administered and plant maintenances.
How guaranteeing the communication quality of mobile subscriber in handover procedure in the honeycomb networking, is one of basic measurement index of radio honeycomb networking capability.
The cellular network of Ying Yonging is a simulation fdma system (FDMA) the earliest, adopts the frequency division networking mode, and promptly neighbor cell uses different frequencies, has between the sub-district of identical frequency across the sub-district of using different frequent points.Make the overlapping area of coverage on neighbor cell border not have co-channel interference like this.The mobile communication user moves to adjacent sub-district from a sub-district, need finish alien frequencies and switch, and belongs to hard handover approach, has communicating interrupt in handoff procedure that is:.Portable terminal at first needs to disconnect former communication link, sets up new communication link with Target cell again.For direct-cut operation, be crucial switching time.If the direct-cut operation time is enough short, just in user's perception of communication less than communicating interrupt.
The representative of Digital Cellular System is tdma (TDMA) and CDMA (Code Division Multiple Access) (CDMA).
So-called code division multiple access is meant that the pseudo noise code differentiation base station of the mutual nearly orthogonal of application and user's technology .CDMA system overcome problem of co-channel interference based on CDMA (Code Division Multiple Access), make the frequency repeat utilization ratio of cellular network reach 1 in theory simultaneously: 1. under the identical networking situation, handover adopts soft handoff. and so-called soft handover is meant and does not have communicating interrupt in handoff procedure, portable terminal is at first set up communication link with handover-target base station, carries out communication with a plurality of base stations simultaneously; When finding that certain signal of base station quality drops to below the thresholding, disconnecting corresponding link again. soft handoff is to connect afterwards earlier to break, and hard handover approach is the company of having no progeny earlier. the surface sees that soft handover has superiority with respect to direct-cut operation, in communication process, there is not communicating interrupt, handoff procedure smoothly will cause handover success rate to improve. in fact, if soft handover is the inevitable choice of CDMA identical networking. there is not soft handover, the cdma network handover success rate will sharply descend. as seen, the application of soft handover has not only guaranteed the continuity of communication in handover procedure, also effectively reduces Zone switched co-channel interference level.
So-called time-division multiple address system is meant voice, the data message of distinguishing different user by different time-gap, disturbs to avoid producing between the different user.For the time-division multiple address system that adopts the TDD communication mode; its uplink downlink is shared same frequency resource; between uplink and downlink timeslot, leave enough big protection time slot, to avoid between uplink and downlink timeslot, having because crosstalking of causing of aerial transmission delay, as shown in Figure 3.Network Synchronization based on the TDMA radio network requirement strictness of TDD.For the time-division multiple address system that adopts the FDD communication mode, its uplink downlink uses different frequency resources, leaves enough big protection frequency band between uplink downlink, with crosstalking of avoiding producing between uplink downlink.The representative of FDD tdma is GSM.What the GSM cellular network adopted in essence is the frequency division networking plan, and handover belongs to direct-cut operation.
The TD-SCDMA multi-carrier district is based on that TD-SCDMA technology derives out, is used to solve the technology of 0 time slot co-channel interference.
The structure of time slot of TD-SCDMA as shown in Figure 4 and Figure 5.Basic radio frames is the 10ms frame, and each 10ms radio frames is divided into two 5ms subframes again.Each 5ms subframe comprises 7 burst time slots and a special time slot.The protection bandwidth length is 96chips, is used to overcome the interference between the uplink downlink.Be called as professional transfer point between the adjacent up-downgoing burst time slot, agreement stipulates that each wireless sub-frame comprises two professional transfer points (referring to TS25.2215A.1).First transfer point is positioned at special time slot, and standard code 0 time slot is as descending time slot, and 1 time slot is as ascending time slot.The professional transfer point of another one allows flexible configuration.0 time slot is used for control channel, for the important function of setting up of communication link.Under the identical networking situation, be subjected to neighbor cell interference for fear of 0 time slot, about the multi-frequency-point community system following agreement is arranged: (referring to industry standard)
" to supporting the sub-district of multifrequency point, the carrier frequency of carrying P-CCPCH is called main carrier frequency, and the carrier frequency that does not carry P-CCPCH is called assistant carrier frequency.To supporting the sub-district of multifrequency point, there is and has only a main carrier frequency.
Main carrier frequency uses identical scrambler and basic midamble. with minor carrier
Common Control Channel DwPCH, P-CCPCH, PICH, S-CCPCH, PRACH waits regulation to be configured on the main carrier frequency.The method FFS that UpPCH, FPACH use on assistant carrier frequency.And to supporting the sub-district of multifrequency point, beacon channel always sends on main carrier frequency.
The multi-slot configuration should be defined as on same carrier frequency.
Same user's uplink-downlink configuration is on same carrier frequency.
The TS0 of assistant carrier frequency does not use.
The time slot transfer point proposed arrangement of main carrier frequency and assistant carrier frequency is identical.”
More than agreement has guaranteed that the cellular network that multi-frequency-point community is formed does not have co-channel interference on the TS0 of main carrier frequency, thereby has guaranteed the correct demodulation of control signaling.But under the identical networking situation (neighbor cell use identical frequency communication), still have co-channel interference at the business time-slot of the overlapping area of coverage of neighbor cell, many more when the sub-district of overlapping covering, co-channel interference is serious more.Though TD-SCDMA adopts CDMA technology in time slot, because the spreading gain in each time slot is limited, while TDD system requirements uplink downlink strict synchronism, the TD-SCDMA network can't use soft hand-off.Therefore in the wireless network that multi-frequency-point community is formed, business time-slot will have a strong impact on mobile subscriber's communication quality in the co-channel interference that cell boarder is subjected to, even cause the switch area communicating interrupt.
Summary of the invention
The technical problem to be solved in the present invention be propose a kind of in the TD-SCDMA multi-frequency-point community cellular network method of handover. this method can overcome the deficiencies in the prior art, not only can guarantee the continuity of communication, can effectively reduce the co-channel interference level at cellular cell edge simultaneously.
Technical scheme of the present invention is that the P-CCPCH received power of Serving cell and neighbor cell is detected in the terminal station, and estimates the signal to noise ratio of Traffic Channel based on the received power of P-CCPCH; Decision is switched according to state of signal-to-noise:
1.1 the signal-to-noise ratio (SNR) estimation of working as Serving cell is less than thresholding T
PhThe time, the terminal station is by the information reporting base station in service sector; Base station in service sector command terminal station switches on the handoff reservation resource of Serving cell continues communication;
1.2 when neighbor cell signal-to-noise ratio (SNR) estimation during greater than the Serving cell signal-to-noise ratio (SNR) estimation, the terminal station is by the information reporting base station in service sector; Base station in service sector instruction user switches to the handoff reservation resource of neighbor cell, and former neighbor cell becomes Serving cell, and former Serving cell becomes neighbor cell;
1.3 work as the Serving cell signal-to-noise ratio (SNR) estimation greater than thresholding T
PhDuring default sluggish bias, the terminal station is by the information reporting base station in service sector; Base station in service sector instruction user switches on the non-handoff reservation resource of Serving cell and continues communication;
Described handoff reservation resource is meant that the multi-frequency-point community system is the mutually orthogonal Radio Resource of the outskirt configuration of neighbor cell; The described mutually orthogonal handoff reservation resource or the time slot of neighbor cell of being meant staggers mutually, and perhaps frequency staggers mutually.
In such scheme, be used to avoid table tennis to switch, when the neighbor cell signal-to-noise ratio (SNR) estimation greater than the Serving cell signal-to-noise ratio (SNR) estimation, and difference is when surpassing another default sluggish bias, the terminal station is just by the information reporting base station in service sector; Base station in service sector instruction user switches to the handoff reservation resource of neighbor cell, and former neighbor cell becomes Serving cell, and former Serving cell becomes neighbor cell.
In the solution of the present invention, the P-CCPCH received power that Serving cell and neighbor cell are detected in the terminal station can be periodically to detect main carrier power.
In the present invention, signal to noise ratio is estimated according to following formula:
In the formula, M represents main carrier power, and subscript j represents to be estimated the numbering of sub-district, and subscript i represents the numbering of other sub-district.
The present invention makes full use of the characteristics of TD-SCDMA multi-frequency-point community, and the TD-SCDMA Radio Resource is divided by timeslice, co-channel interference mainly is created in features such as cellular cell border, effectively reduce level of same frequency interference at edge of sector, thereby guaranteed the communication quality of mobile subscriber in handover procedure.The present invention is based on the thought that cellular cell is divided into interior outskirt, in conjunction with handover procedure, dispatch by Radio Resource (time slot, frequency etc.), make to be in the user that cellular cell outskirt (the overlapping area of coverage/switch area) belongs to the different base station sub-district and to use mutually orthogonal Radio Resource communication, to avoid co-channel interference.
Description of drawings:
Fig. 1: honeycomb communication network topological diagram;
Fig. 2: typical cellular communication system schematic diagram;
Fig. 3: based on the communication time slot schematic diagram of the time-division multiple address system of time division duplex (TDD);
Fig. 4: the 10ms of TD-SCDMA system frame structure;
Fig. 5: the 5ms of TD-SCDMA system subframe structure;
Fig. 6: timeslot scheduling state diagram.
Embodiment
The present invention supposes that TD-SCDMA multi-frequency-point community system is that the outskirt of neighbor cell has disposed mutually orthogonal Radio Resource, hereinafter is referred to as the handoff reservation resource.Mutually orthogonal implication is: the handoff reservation resource or the time slot of neighbor cell stagger mutually, and perhaps frequency staggers mutually.
Cellular network with TD-SCDMA multi-frequency-point community tissue is an example below, and the method for handover that specifies the present invention's proposition cooperates the enforcement of timeslot scheduling.
As shown in Figure 6.In the multi-frequency-point community system, the handoff reservation resource can be unified on the same carrier wave, also can be distributed on the different carrier waves.The number needs of concrete reserved resource will be according to service switchover amount demand flexible configuration.The resource distribution of present embodiment hypothesis handoff reservation occupies all business time-slots on main carrier.
In the multi-frequency-point community Cellular Networks, in arbitrary cells, be in the following nothing more than two states of user under the communication state:
State 1 definition: user terminal uses the non-switchable resource communication of certain base station cell;
State 2 definition: user terminal uses the switchable resource communication of certain base station cell.
No matter be in which kind of state, user terminal can adopt periodic method to detect the main carrier power M of current service sector
kWith adjacent sectors main carrier power M
i(i=1,2 ..., N; I ≠ k), unit is milliwatt (mW).Adjacent sectors has one, also has a plurality of.User terminal detects based on the main carrier received power, estimates the signal to noise ratio of service carrier wave; Adopt the thresholding mode to report testing result.Any sector signal to noise ratio Q
jEstimation formulas as follows:
Subscript j represents to be estimated the numbering of sub-district, and subscript i represents the numbering of other sub-district.
Detecting the trigger event of estimating (Event) that reports based on signal to noise ratio comprising:
E1 adjacent area snr of received signal is better than current service cell
Formula: Q
i〉=Q
k+ H
E1
H wherein
E1For the sluggishness biasing, can determine default value according to theoretical calculate and emulation, in actual applications, can optimize and revise according to network environment.This incident evaluation algorithm detects the E1 incident for working as user terminal, and this incident duration T
E1, this incident reports triggering.
E2 current service cell signal to noise ratio is lower than a certain thresholding
Formula: Q
k≤ T
Ph
This incident evaluation algorithm detects the E2 incident for working as user terminal, and this incident duration T
E2, this incident reports triggering.
E3 current service cell signal to noise ratio is higher than a certain thresholding
Formula: Q
k〉=T
Ph+ H
E3
H wherein
E3For the sluggishness biasing, can determine default value according to theoretical calculate and emulation, in actual applications, can optimize and revise according to network environment.This incident evaluation algorithm detects the E3 incident for working as user terminal, and this incident duration T
E3, this incident reports triggering.
Base station system is implemented scheduling of resource according to the reported result of user terminal, the conversion of control user terminal between two kinds of communication states. and concrete state transition condition is as follows:
State transition condition 1:, then switch to Serving cell state 2 by Serving cell state 1 if be in the user terminal to send up E2 incident of state 1;
State transition condition 2:, switch to Serving cell state 1 by Serving cell state 2 if be in the user terminal to send up E3 incident of state 2;
State transition condition 3:, switch to the state 2 of Target cell by the state 2 of Serving cell if be in the user terminal to send up E1 incident of state 2.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (5)
1. realize the method for handover at the TD-SCDMA multi-frequency-point community, the P-CCPCH received power of Serving cell and neighbor cell is detected in the terminal station, and estimates the signal to noise ratio of Traffic Channel based on the received power of P-CCPCH; Decision is switched according to state of signal-to-noise:
1.1 the signal-to-noise ratio (SNR) estimation of working as Serving cell is less than thresholding T
PhThe time, the terminal station is by the information reporting base station in service sector; Base station in service sector command terminal station switches on the handoff reservation resource of Serving cell continues communication;
1.2 when neighbor cell signal-to-noise ratio (SNR) estimation during greater than the Serving cell signal-to-noise ratio (SNR) estimation, the terminal station is by the information reporting base station in service sector; Base station in service sector instruction user switches to the handoff reservation resource of neighbor cell, and former neighbor cell becomes Serving cell, and former Serving cell becomes neighbor cell;
1.3 work as the Serving cell signal-to-noise ratio (SNR) estimation greater than thresholding T
PhDuring default sluggish bias, the terminal station is by the information reporting base station in service sector; Base station in service sector instruction user switches on the non-handoff reservation resource of Serving cell and continues communication;
Described handoff reservation resource is meant that the multi-frequency-point community system is the mutually orthogonal Radio Resource of the outskirt configuration of neighbor cell; The described mutually orthogonal handoff reservation resource or the time slot of neighbor cell of being meant staggers mutually, and perhaps frequency staggers mutually.
2. the described method that realizes handover at the TD-SCDMA multi-frequency-point community of claim 1, it is characterized in that, when the neighbor cell signal-to-noise ratio (SNR) estimation greater than the Serving cell signal-to-noise ratio (SNR) estimation, and difference is when surpassing another default sluggish bias, the terminal station is just by the information reporting base station in service sector; Base station in service sector instruction user switches to the handoff reservation resource of neighbor cell, and former neighbor cell becomes Serving cell, and former Serving cell becomes neighbor cell.
3. claim 1 or 2 described methods at TD-SCDMA multi-frequency-point community realization handover is characterized in that the P-CCPCH received power that Serving cell and neighbor cell are detected in the terminal station is to detect main carrier power.
4. claim 1 or 2 described methods at TD-SCDMA multi-frequency-point community realization handover is characterized in that the P-CCPCH received power that Serving cell and neighbor cell are detected in the terminal station is periodically to detect.
5. claim 1 or describedly realize the method for handover it is characterized in that signal to noise ratio is estimated according to following formula at the TD-SCDMA multi-frequency-point community:
In the formula, M represents main carrier power, and subscript j represents to be estimated the numbering of sub-district, and subscript i represents the numbering of other sub-district.
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| CN101541052B (en) * | 2008-03-21 | 2011-03-30 | 华为技术有限公司 | Method for optimizing switching process and base station equipment |
| CN102036266B (en) * | 2009-09-30 | 2013-08-07 | 鼎桥通信技术有限公司 | Event trigger reporting and measuring method of Iub interface |
| CN102612851B (en) * | 2009-11-11 | 2016-03-30 | 瑞典爱立信有限公司 | For switching the method and apparatus of anchor carrier wave |
| CN102098747B (en) * | 2011-01-21 | 2013-05-01 | 京信通信技术(广州)有限公司 | TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) switching method and device |
| CN103220704B (en) | 2012-01-21 | 2019-02-26 | 华为技术有限公司 | The method and apparatus of enhancing are measured in wireless communication system |
| CN103781110B (en) * | 2012-10-22 | 2018-02-06 | 华为技术有限公司 | A kind of cell is to the method for adjustment of offset and base station, system |
| CN104617995B (en) * | 2014-12-29 | 2018-04-03 | 三维通信股份有限公司 | A kind of indoor DAS system based on day line options resists small uplink signal of base station interference method |
| CN110324843A (en) * | 2019-06-19 | 2019-10-11 | Oppo广东移动通信有限公司 | Method for improving, low-power consumption WAN equipment and the storage medium of communication quality |
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| CN1365579A (en) * | 2000-03-30 | 2002-08-21 | 松下电器产业株式会社 | Base station apparatus and handover control method |
| CN1731883A (en) * | 2004-08-04 | 2006-02-08 | 中兴通讯股份有限公司 | Switch adjudgement method in TD-SCDMA system |
| CN1735258A (en) * | 2004-08-10 | 2006-02-15 | 中兴通讯股份有限公司 | Multi-carrier frequency cell major and minor carrier frequency adjusting method in TD-SCDMA system |
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|---|---|---|---|---|
| CN1365579A (en) * | 2000-03-30 | 2002-08-21 | 松下电器产业株式会社 | Base station apparatus and handover control method |
| CN1731883A (en) * | 2004-08-04 | 2006-02-08 | 中兴通讯股份有限公司 | Switch adjudgement method in TD-SCDMA system |
| CN1735258A (en) * | 2004-08-10 | 2006-02-15 | 中兴通讯股份有限公司 | Multi-carrier frequency cell major and minor carrier frequency adjusting method in TD-SCDMA system |
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