CN100401841C - Idle handoff method - Google Patents
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- CN100401841C CN100401841C CNB2005100513183A CN200510051318A CN100401841C CN 100401841 C CN100401841 C CN 100401841C CN B2005100513183 A CNB2005100513183 A CN B2005100513183A CN 200510051318 A CN200510051318 A CN 200510051318A CN 100401841 C CN100401841 C CN 100401841C
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Abstract
The present invention discloses an idle switching method which comprises the steps: A, the pilot frequency of an activation set is judged whether or not to be illegal; if the pilot frequency is illegal, step B is executed; otherwise, step C is executed; B, illegal pilot frequency information is recorded, and step C is executed; C, adjacent pilot frequencies are searched; if the adjacent pilot frequencies are not recorded illegal pilot frequencies, idle switch is judged whether or not to carry out; if the idle switch is needed, the idle switch is executed and steps A is returned; if the idle switch is not needed, the step C is returned. The idle switch method of the present invention can make a mobile station preferably and idly switched to a legal network for ensuring the normal communication of the mobile station to the largest degree.
Description
Technical field
The present invention relates to code division multiple access (CDMA) mobile communication technology, specially refer to a kind of method that travelling carriage carries out idle switching in based on the connecting system of CDMA (Code Division Multiple Access).
Background technology
CDMA technology is a kind of advanced person's a digital communication technology, has availability of frequency spectrum height, power system capacity is big, advantages such as good communication quality, if therefore CDMA technology is applied in the Local Network as a kind of access technology, telephone call office is to the wired access between the user terminal in the existing local network of use cdma wireless access way replacement, user terminal on the original meaning is moved freely within the specific limits, promptly become travelling carriage from landline telephone, the transformation of this access way simultaneously also will make existing Local Network have the user and use flexibly, easy for installation, the advantage that mobile communication system such as small investment and instant effect is had.
Fig. 1 has shown the above-mentioned this wireless access system based on CDMA technology that is applied in the local network.As can be seen from the figure, described wireless access system mainly comprises: one or more base station and the Radio Access Controller (RAC) that is connected by wired mode with all base stations.In this wireless access system, travelling carriage (being user terminal mentioned above) communicates by wireless connections and base station, and RAC is connected to Local Exchange by wired mode.As can be seen from Figure 1, travelling carriage can be realized various local services by CDMA mode wireless access in the Local Network.
Because the roaming of travelling carriage between different local networks still can not be realized in the Local Network at present,, can only in the local network of self registering, converse though cause the travelling carriage in the local network to move.Like this, when CDMA technology is applied to the Local Network as a kind of access technology, when realizing the access of Local Network travelling carriage, just need to guarantee that travelling carriage can preferentially reside in the local network of its registration.
But, existing C DMA consensus standard supports mobile free-roaming under different base stations.Stipulate according to agreement, when travelling carriage powers in start, the initialization of system will at first be carried out, seek the strongest pilot signal as current Active Set pilot signal, and from the synchronizing channel of this Active Set pilot signal correspondence, obtain the configuration and the timing information of system, be linked in the described system according to configuration that receives and timing information, enter system's idle condition subsequently.Travelling carriage can make a call or accept the paging of system under described idle condition.And, when travelling carriage is in idle condition, also will constantly monitor other adjacent pilot frequencies signals in its adjacent pilot frequencies collection or candidate's pilot set or the residue pilot set, when the intensity that detects certain adjacent pilot frequencies signal was compared the idle switching condition (more than advising that usually the adjacent pilot frequencies signal strength signal intensity is greater than Active Set pilot signal strength 3dB) that satisfies default with current Active Set pilot signal strength, travelling carriage switched to the higher adjacent pilot frequencies of signal strength signal intensity with the free time.Like this, can guarantee that travelling carriage is in the best base station range of signal all the time, and then guarantee its communication quality.
Can it is evident that from the idle handoff procedure of above-mentioned existing CDMA consensus standard regulation in existing idle handoff procedure, travelling carriage is not judged the legitimacy of access network, but preferentially select the strongest network of signal.Like this, will cause when travelling carriage is in or move to the overlapping region of its registered network and non-registered network, when just being in the overlapping region of legal access network and un-authorised access to network, if un-authorised access to network pilot transmitted signal strength signal intensity is far longer than the pilot signal strength of legitimate network, then travelling carriage can be selected to be linked in the higher illegal network of pilot signal strength, causes this travelling carriage to communicate by letter normally.At this moment, even the communication quality between travelling carriage and the legitimate network can satisfy the requirement of system, according to above-mentioned signal strength signal intensity principle of priority, travelling carriage also can't be selected to be linked in the relatively low legitimate network of signal strength signal intensity, thereby causes user's traffic lost.
Fig. 2 is for the network diagram of above-mentioned this traffic lost situation occurring.As shown in Figure 2, when current mobile station is in the overlapping region of local network 1 and local network 2, can detect the pilot signal of base station 1 and base station 2 simultaneously.Setting this travelling carriage registers in local network 1, and not in local network 2 registrations, be that local network 1 is the legitimate network of this travelling carriage, and local network 2 is illegal networks of this travelling carriage, then this travelling carriage can proper communication in local network 1, and can't proper communication in local network 2.
It is the strongest to suppose that current mobile station detects the pilot signal of base station 2, and its intensity is far longer than the pilot signal strength of base station 1, and according to the idle switching condition that cdma system is set, this travelling carriage switches to base station 2 with the free time.After switching in the free time, when travelling carriage detected base station 2 and is illegal base station, travelling carriage can leave base station 2, reenters init state, reselects the strongest pilot signal as its Active Set pilot signal.The pilot signal of supposing base station 2 is still the strongest, travelling carriage can be once more with the pilot signal of base station 2 as its Active Set pilot signal, and go down so repeatedly.At this moment, even the signal quality of base station 1 can satisfy communicating requirement, travelling carriage also can't switch to base station 1 free time, communicate by letter normally.Therefore in this case, the user will can't be served all the time normally.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of idle method of switching, make when travelling carriage is in the overlapping region of legitimate network and illegal network, can preferentially select the free time to switch to legitimate network, guarantee the proper communication of travelling carriage as far as possible.
Idle handoff method for mobile communication devices of the present invention may further comprise the steps:
A, judge whether current Active Set pilot tone is illegal pilot tone, if, execution in step B; Otherwise, execution in step C;
B, record described illegal pilot frequency information, execution in step C then;
C, adjacent pilot frequencies of retrieval, if this adjacent pilot frequencies is not the illegal pilot tone of record, then the intensity according to the adjacent pilot frequencies signal judges whether that needs carry out the free time switching, if desired, then carries out idle the switching, and returns steps A; If do not need, then return this step.
The method of the invention set in advance an illegal list of pilots before steps A;
Step B is described to be recorded as: current Active Set pilot frequency information is recorded in the described illegal list of pilots.
The method of the invention further comprises: when initialization, described illegal list of pilots is set for empty.
Pilot frequency information of the present invention is the parameter of sign base station.
The parameter of sign of the present invention base station is the PN biasing or the base station identifying signal of base station pilot signals.
Steps A is described judges that whether current Active Set pilot tone is that the method for illegal pilot tone is: travelling carriage compares the current network parameter that receives and the legitimate network parameter of self preserving, if the current network parameter that receives belongs to the legitimate network parameter that self preserves, then current Active Set pilot tone is exactly legal pilot tone; Otherwise, be illegal pilot tone.
Network parameter of the present invention comprises system banner and network identity.
Steps A is described judges that whether current Active Set pilot tone is that the method for illegal pilot tone comprises:
Travelling carriage sends registration message to the base station of this Active Set pilot tone correspondence;
Described base station judges whether this travelling carriage is the validated user of current network, if this base station will be returned registration and accept message; Otherwise, return the registration refuse information;
Travelling carriage is judged according to receiving message, accepts message if receive registration, judges that then this Active Set pilot tone is legal pilot tone; If receive the registration refuse information, judge that then this Active Set pilot tone is illegal pilot tone.
The method of the described retrieval adjacent pilot frequencies of step C is: in adjacent pilot frequencies collection or candidate's pilot set or the described adjacent pilot frequencies of residue pilot tone centralized detecting.
Step C of the present invention further comprises: when described adjacent pilot frequencies is illegal pilot tone, directly return this step.
If current Active Set pilot tone is legal pilot tone, then step C is described judges whether to carry out the free time and switches to: judge according to the intensity of described adjacent pilot frequencies signal whether this adjacent pilot frequencies satisfies idle switching condition, if satisfy, then need to carry out free time switching; Otherwise, do not need to carry out the free time switching.
If current Active Set pilot tone is illegal pilot tone, then step C is described judges whether that need carry out the free time switches to: judge that according to the intensity of described adjacent pilot frequencies signal whether the signal strength signal intensity of this adjacent pilot frequencies is more than or equal to minimum available thresholding, if, then need to carry out the free time switching, otherwise, do not need to carry out the free time switching.
When current Active Set pilot tone is illegal pilot tone and described adjacent pilot frequencies when being illegal pilot tone, step C further comprises: judge whether described adjacent pilot frequencies satisfies idle switching condition, if satisfy, then carry out idle the switching, and return steps A; Otherwise, directly return this step.
This shows, idle handoff method for mobile communication devices of the present invention is by the idle handoff procedure of simple modification existing protocol standard definition, when inserting, writes down travelling carriage the illegal base station pilot information in the detected illegal network, guarantee in idle handoff procedure, the illegal base station that travelling carriage can not selected the free time to switch to be write down once more, even make when illegally the pilot signal strength of base station is far longer than the signal strength signal intensity of legitimate base station, travelling carriage still can preferentially select to be linked into the legitimate base station in the legitimate network, has effectively avoided user's traffic lost.
Description of drawings
Fig. 1 has shown existing wireless access system based on CDMA technology;
Fig. 2 is for the schematic diagram of customer service damaed cordition occurring in two overlapped local networks;
Fig. 3 carries out the idle method flow diagram that switches for the described travelling carriage of a preferred embodiment of the invention;
Fig. 4 carries out the idle method flow diagram that switches for the described travelling carriage of another preferred embodiment of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make invention is clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
In order to solve the traffic lost that may occur in the prior art, method of the present invention has been carried out simple modification to the idle handoff procedure of existing CDMA consensus standard definition, make travelling carriage in access and idle handoff procedure, constantly write down the illegal base station information in the detected illegal network, the free time does not switch on the detected illegal base station once more to guarantee travelling carriage, and then guarantee that even pilot signal strength in illegal base station is far longer than under the situation of signal strength signal intensity of legitimate base station, travelling carriage still can preferentially be selected the base station in the legitimate network.
In a preferred embodiment of the invention, travelling carriage sets in advance an illegal list of pilots, is used to write down the pilot frequency information of detected illegal base station, and when initialization, described illegal list of pilots is set to sky.Those skilled in the art will appreciate that travelling carriage also can be provided with a sky in initialized process illegal list of pilots writes down described illegal pilot frequency information.
Described pilot frequency information is PN biasing, base station identifying signal or other any parameter that can identify described illegal base station of illegal base station pilot signals.
Fig. 3 has shown that the described travelling carriage of the preferred embodiment carries out the idle method flow that switches.As shown in Figure 3, this embodiment said method comprising the steps of:
Step 301: whether the network of judging current Active Set pilot tone place is legitimate network, if, execution in step 302; Otherwise, execution in step 306.
Whether the network that this step is described judges current Active Set pilot tone place is that the method for legitimate network comprises two kinds.
First kind is: the network parameter that travelling carriage issues the current system that receives, comprise: SID and NID in the legitimate network parameter list that system banner (SID) and network identity (NID) and travelling carriage are preserved when opening an account compare, if current SID that receives and NID are in described legitimate network parameter list, the network at then current Active Set pilot tone place is exactly a legitimate network; Otherwise, be illegal network just.
Second kind is: travelling carriage sends registration message to the base station of this Active Set pilot tone correspondence, judge by the base station of this Active Set pilot tone correspondence whether this travelling carriage is the validated user of current network, if, then the base station of this Active Set pilot tone correspondence will send registration and accept message to travelling carriage, and travelling carriage is accepted message according to the registration that receives and judged that the network at this Active Set pilot tone place belongs to legitimate network; Otherwise the base station of this Active Set pilot tone correspondence will send the registration refuse information, and travelling carriage judges that according to the registration refuse information that receives the network at this Active Set pilot tone place belongs to illegal network.
Step 302: adjacent pilot frequencies of retrieval in adjacent pilot frequencies collection, candidate's pilot set or residue pilot set, execution in step 303 then.
Step 303: judge that according to described illegal list of pilots whether the adjacent pilot frequencies that retrieves is the pilot tone in the described illegal list of pilots, if return step 302; Otherwise, execution in step 304.
Step 304: judge whether the adjacent pilot frequencies that retrieves satisfies idle switching condition, if, execution in step 305; Otherwise, return step 302.
Described here idle switching condition is identical with the idle switching condition of existing CDMA consensus standard definition.
From step 302 to 304 as can be seen, when travelling carriage is in the legitimate network, if comparing with current Active Set pilot signal strength, the adjacent pilot frequencies signal strength signal intensity satisfies described idle switching condition, then travelling carriage should idle switch on the higher adjacent pilot frequencies of signal strength signal intensity, thereby guarantee to have communication quality preferably all the time between travelling carriage and the base station, even guaranteed the pilot signal strength height of the pilot signal strength of illegal base station than legitimate base station simultaneously, travelling carriage can not select the free time to switch to illegal base station yet yet.
Step 305: carry out idle the switching, described adjacent pilot frequencies as the Active Set pilot tone, is returned step 301 then.
Step 306: the pilot frequency information of current Active Set pilot tone respective base station is recorded in the illegal list of pilots, and execution in step 307 then.
Step 307: adjacent pilot frequencies of retrieval in adjacent pilot frequencies collection, candidate's pilot set or residue pilot set, execution in step 308 then.
Step 308: judge that according to described illegal list of pilots whether the adjacent pilot frequencies that retrieves is the pilot tone in the described illegal list of pilots, if return step 307; Otherwise, execution in step 309.
Step 309: whether the intensity of judging described adjacent pilot frequencies more than or equal to the minimum available thresholding of default, if, execution in step 305; Otherwise, return step 307.
The described minimum available thresholding of this step is the travelling carriage preset parameters, and the expression base station can be travelling carriage the proper communication minimum pilot signal strength in when service is provided.
From step 306 to step 309 as can be seen, when travelling carriage is in the illegal network, no matter whether the legal adjacent pilot frequencies signal strength signal intensity that retrieves satisfies described idle switching condition, as long as this adjacent pilot frequencies signal strength signal intensity just can provide service for travelling carriage more than or equal to the minimum available thresholding of default.Therefore, in this case, whether travelling carriage should switch on the legitimate network that service can be provided more than or equal to preferential selection of the condition of minimum available thresholding according to adjacent pilot frequencies intensity, be lower than the pilot signal strength of illegal base station even guaranteed the pilot signal strength of legitimate base station, travelling carriage also can preferentially select the free time to switch to legitimate base station.
This shows, in the process that the described method of the preferred embodiment was switched in the free time by setting up the pilot frequency information that illegal list of pilots writes down illegal base station, and judge the legitimacy of current adjacent pilot frequencies before switching in the free time according to described illegal list of pilots, avoided the selection that repeats, thereby effectively avoided user's traffic lost illegal base station.
But, use the described method of this embodiment, in travelling carriage is in the coverage of illegal network, and when not having available legal pilot tone in its adjacent pilot frequencies, travelling carriage will circulate and carry out above-mentioned steps 308 and step 309, promptly this travelling carriage will constantly be searched for its adjacent pilot frequencies this moment, and can not select any illegal pilot tone as its Active Set pilot tone, till finding available legal pilot tone.In this case, if the current Active Set pilot signal of this travelling carriage is attenuated to below the minimum available thresholding of default, then will cause travelling carriage to fall the generation of net situation, make it reenter init state, restart the search procedure of pilot signal, increase the power consumption of travelling carriage, shortened the stand-by time of travelling carriage.
For fear of the above-mentioned net situation of falling occurring, another preferred embodiment of the present invention has provided the method that addresses this problem, as shown in Figure 4, in the described method of this embodiment, all the step 301 with the described method of preamble is identical to step 307 and step 309 to step 407 and step 409 for its step 401, and step 408 has been carried out revising and increasing step 410.
Wherein, step 408 is: judge that according to described illegal list of pilots whether the adjacent pilot frequencies that retrieves is the pilot tone in the described illegal list of pilots, if then execution in step 410; Otherwise, execution in step 409.
Step 410 is: judge whether the adjacent pilot frequencies that retrieves satisfies idle switching condition, if execution in step 405 is carried out the free time switching; Otherwise, return step 407, continue next adjacent pilot frequencies signal of search.
From above-mentioned through the step 408 revised and step 410 as can be seen, even current mobile station is in the coverage of illegal network, and when not having available legal pilot tone in its adjacent pilot frequencies, travelling carriage also can idle switch on the higher illegal base station of other pilot frequency intensities, and on the adjacent pilot frequencies of this illegal base station continuous other available legal pilot tones of search, therefore, can when retrieving available legal pilot tone, switch on this legal pilot tone fast, avoid occurring the above-mentioned net phenomenon of falling, accelerated the idle switching efficiency of travelling carriage, reduce the power consumption of travelling carriage, increased the stand-by time of travelling carriage.
From above-mentioned idle handoff procedure as can be seen, above-mentioned two described methods of embodiment are by constantly detect, write down illegal pilot frequency information in idle handoff procedure, and judge the legitimacy of current adjacent pilot frequencies before switching in the free time, avoided the repeat selection of travelling carriage, realized what legitimate base station was preferentially selected illegal base station.Therefore, it will be appreciated by those skilled in the art that, in above-mentioned idle handoff method for mobile communication devices, can also set up legal list of pilots and write down legal pilot frequency information, by only allowing travelling carriage to switch to legal pilot tone from the legal pilot tone free time, perhaps switch to the preferential selection of the method realization legitimate base station of legal pilot tone, and can not exceed the spirit and scope of the present invention from the illegal pilot tone free time.
Claims (13)
1. an idle method of switching is characterized in that, said method comprising the steps of:
A, judge whether current Active Set pilot tone is illegal pilot tone, if, execution in step B; Otherwise, execution in step C;
B, record described illegal pilot frequency information, execution in step C then;
C, adjacent pilot frequencies of retrieval, if this adjacent pilot frequencies is not the illegal pilot tone of record, then the intensity according to the adjacent pilot frequencies signal judges whether that needs carry out the free time switching, if desired, then carries out idle the switching, and returns steps A; If do not need, then return this step.
2. the method for claim 1 is characterized in that, described method set in advance an illegal list of pilots before steps A;
Step B is described to be recorded as: current Active Set pilot frequency information is recorded in the described illegal list of pilots.
3. method as claimed in claim 2 is characterized in that, described method further comprises: when initialization, described illegal list of pilots is set for empty.
4. method as claimed in claim 1 or 2 is characterized in that, described pilot frequency information is the parameter of sign base station.
5. method as claimed in claim 4 is characterized in that, the parameter of described sign base station is the PN biasing or the base station identifying signal of base station pilot signals.
6. the method for claim 1, it is characterized in that, steps A is described judges that whether current Active Set pilot tone is that the method for illegal pilot tone is: travelling carriage compares the current network parameter that receives and the legitimate network parameter of self preserving, if the current network parameter that receives belongs to the legitimate network parameter that self preserves, then current Active Set pilot tone is exactly legal pilot tone; Otherwise, be illegal pilot tone.
7. method as claimed in claim 6 is characterized in that described network parameter comprises system banner and network identity.
8. the method for claim 1 is characterized in that, steps A is described judges that whether current Active Set pilot tone is that the method for illegal pilot tone comprises:
Travelling carriage sends registration message to the base station of this Active Set pilot tone correspondence;
Described base station judges whether this travelling carriage is the validated user of current network, if this base station will be returned registration and accept message; Otherwise, return the registration refuse information;
Travelling carriage is judged according to receiving message, accepts message if receive registration, judges that then this Active Set pilot tone is legal pilot tone; If receive the registration refuse information, judge that then this Active Set pilot tone is illegal pilot tone.
9. the method for claim 1 is characterized in that, the method for the described retrieval adjacent pilot frequencies of step C is: in adjacent pilot frequencies collection or candidate's pilot set or the described adjacent pilot frequencies of residue pilot tone centralized detecting.
10. the method for claim 1 is characterized in that, described step C further comprises: when described adjacent pilot frequencies is illegal pilot tone, directly return this step.
11. the method for claim 1, it is characterized in that, if current Active Set pilot tone is legal pilot tone, then step C is described judges whether to carry out the free time and switches to: judge according to the intensity of described adjacent pilot frequencies signal whether this adjacent pilot frequencies satisfies idle switching condition, if satisfy, then need to carry out the free time switching; Otherwise, do not need to carry out the free time switching.
12. the method for claim 1, it is characterized in that, if current Active Set pilot tone is illegal pilot tone, then step C is described judges whether that need carry out the free time switches to: judge that according to the intensity of described adjacent pilot frequencies signal whether the signal strength signal intensity of this adjacent pilot frequencies is more than or equal to minimum available thresholding, if, then need to carry out the free time switching, otherwise, do not need to carry out the free time switching.
13. as claim 1 or 12 described methods, it is characterized in that, when current Active Set pilot tone is that illegal pilot tone and described adjacent pilot frequencies are when being illegal pilot tone, step C further comprises: judge whether described adjacent pilot frequencies satisfies idle switching condition, if satisfy, then carry out idle the switching, and return steps A; Otherwise, directly return this step.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100513183A CN100401841C (en) | 2005-03-04 | 2005-03-04 | Idle handoff method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100513183A CN100401841C (en) | 2005-03-04 | 2005-03-04 | Idle handoff method |
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| CN1829378A CN1829378A (en) | 2006-09-06 |
| CN100401841C true CN100401841C (en) | 2008-07-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20010049790A1 (en) * | 2000-05-30 | 2001-12-06 | Stefano Faccin | System and method of controlling application level access of subscriber to a network |
| CN1482832A (en) * | 2002-09-10 | 2004-03-17 | ��Ϊ��������˾ | Method for safety switching of mobile terminal between wireless local net access nodes |
| KR20040074039A (en) * | 2004-08-03 | 2004-08-21 | (주)테크바일 | Management of receiving/absent calls and receiving/originating number list on the cell phone upon user's request |
| CN1527520A (en) * | 1999-11-01 | 2004-09-08 | 株式会社日立制作所 | Handover control method and mobile station usintg the same method |
| CN1585534A (en) * | 2003-08-20 | 2005-02-23 | 中兴通讯股份有限公司 | Illegal position updating processing method |
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2005
- 2005-03-04 CN CNB2005100513183A patent/CN100401841C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1527520A (en) * | 1999-11-01 | 2004-09-08 | 株式会社日立制作所 | Handover control method and mobile station usintg the same method |
| US20010049790A1 (en) * | 2000-05-30 | 2001-12-06 | Stefano Faccin | System and method of controlling application level access of subscriber to a network |
| CN1482832A (en) * | 2002-09-10 | 2004-03-17 | ��Ϊ��������˾ | Method for safety switching of mobile terminal between wireless local net access nodes |
| CN1585534A (en) * | 2003-08-20 | 2005-02-23 | 中兴通讯股份有限公司 | Illegal position updating processing method |
| KR20040074039A (en) * | 2004-08-03 | 2004-08-21 | (주)테크바일 | Management of receiving/absent calls and receiving/originating number list on the cell phone upon user's request |
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| CN1829378A (en) | 2006-09-06 |
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