CN100488283C - Method for switching between frequency bands in mixed cell - Google Patents
Method for switching between frequency bands in mixed cell Download PDFInfo
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- CN100488283C CN100488283C CNB200610032918XA CN200610032918A CN100488283C CN 100488283 C CN100488283 C CN 100488283C CN B200610032918X A CNB200610032918X A CN B200610032918XA CN 200610032918 A CN200610032918 A CN 200610032918A CN 100488283 C CN100488283 C CN 100488283C
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Abstract
The present invention discloses frequency range switching method in mixing cell. It contains 1, configuring mixing cell own BCCH frequently point to said cell neighbouring areas list; 2, mobile station through system message learning said neighbouring areas list, cycle detecting each BCCH frequently point signal intensity in each BCCH and reporting measuring result; 3, system obtaining said cell BCCH frequency range signal intensity and to make relevant switching processing to mobile station calling according to mobile station calling located frequency range. The present invention can switch when calling being non-BCCH frequency range; capable of rising switching success ratio and accuracy when calling being BCCH frequency range.
Description
Technical field
The present invention relates to the wireless communication technique field, be specifically related to a kind of method of switching between frequency range of in mixed cell, carrying out.
Background technology
Along with the extensive development of GSM, it is more and more nervous that frequency resource has become, and progressively become the bottleneck that gsm system further develops.If quick, economic, the effective dilatation scheme of neither one, mobile communication frequency resource deficiency nervous and wireless channel will be very outstanding contradiction.The gsm system dilatation has several different methods, comprises the increase macrocell base stations, reduces stop spacing; Adopt multiple frequency multiplex technique (MRP); The expansion microcellulor; And method such as half rate application.But these methods all can not fundamentally solve the problem of network capacity deficiency.
Existing best solution is to introduce new frequency range, the DCS1800 frequency range be introduced in the contradiction that has alleviated the frequency resource deficiency to a certain extent, but because the DCS1800 operating frequency exceeds one times of GSM900, according to COST-231 model and practical experience, its propagation loss is at the high 6dB of sighting distance internal ratio GSM900; High 10dB outside sighting distance; The high 5-17dB of propagation loss (according to the medium difference) in building.1800 rapid fading characteristic also is unfavorable for realizing 1800 good covering, thereby directly influences the performance of network.
In order fundamentally to solve the problem of frequency resource anxiety, avoid the deficiency of DCS1800 frequency range simultaneously, building dual-frequency network has become a kind of development trend.Build dual-frequency network at present and mainly contain three kinds of networking modes: independent MSC (Mobile switching centre, mobile switching centre), MSC Independent B SC (Basestation controller, base station controller) and BSC networking mode altogether altogether.No matter adopt above-mentioned which kind of mode, switch the minizone and the sub-district gravity treatment all can't be avoided, and will inevitably reduce network quality.In order to address the above problem, mixed cell becomes the focus of dual-frequency network development.So-called mixed cell, claim BCCH (BroadcastControl CHannel altogether again, Broadcast Control Channel) sub-district is meant the carrier frequency (as the carrier frequency of 900M frequency range and the carrier frequency of 1800 frequency ranges) that has different frequency range in same sub-district, the shared BCCH frequency of the carrier frequency of different frequency range.The great advantage that adopts mixed cell to build dual-frequency network is, it is different that this mode makes that other frequency range and primary band there is no, both coexist as a sub-district, other frequency range becomes extending naturally of primary band, have overcome the sub-district gravity treatment that other networking modes cann't be solved and the problem of switching.But because the propagation characteristic of GSM900 and DCS1800 there are differences, especially in indoor covering, there are differences, increased the difficulty of network optimization work.
In the gsm system of single frequency band, switching main is to carry out at this Serving cell and neighboring interval, therefore all be to adjudicate as the reference value with the BCCH signal of adjacent cell, acquiescence TCH (TrafficChannel, Traffic Channel) channel quality is suitable substantially with the BCCH channel quality.
And in being total to the BCCH sub-district,, support the user of multiband between these two frequency ranges, to switch owing to there is different frequency range simultaneously.Therefore accurately be switching to the important assurance that good speech quality and balance different frequency range traffic carrying capacity are provided between frequency range in the sub-district.In the mixed cell that uses 900M frequency range and 1800 frequency ranges, because the propagation loss of 900M is little, covering performance is good, under this networking situation, generally uses frequency in the 900M frequency range as BCCH.But because the propagation characteristic of two frequency ranges is inconsistent, when calling out in 900 frequency ranges, the signal of 1800 frequency ranges might be stronger than the signal of current calling, also may be than a little less than the current calling.Therefore, not the residing frequency range of BCCH if call out the frequency range at place, how to know the level intensity of BCCH frequency range, between two frequency ranges, switch accurately, this is a difficult problem of industry.
At present, industry adopts the processing mode of similar concentric circles handoff algorithms usually, adopts " fixing double frequency difference " is set, and different frequency range level is compensated.For example, when calling was in the 1800M frequency range, the descending level value on the 1800M frequency range that this calling is measured deducted or adds a fixing value, as the prediction to 900M frequency range level intensity, is used for the judgement of handoff algorithms.The shortcoming of this method is: because the propagation characteristic of two frequency ranges is inconsistent, as previously mentioned, under different distances and landform and environmental condition, have different losses; And if 900 frequency ranges are different with the antenna direction of 1800 frequency ranges, also may cause in different regions, the situation that the strength difference of two frequency ranges is different, therefore adopting fixing difference to predict the signal strength signal intensity of corresponding frequency band, clearly is to solve signal strength signal intensity is different under the wireless environment of complexity problem.Adopt this method, cause mistake to switch easily, cause handoff failure even switch call drop occurring, significantly influence voice quality.Under this technical scheme, there is serious defective in BCCH sub-district function altogether, even commercialization that can't be formal.
Summary of the invention
Order of the present invention is for providing a kind of method of switching between frequency range of can carrying out, the accuracy when switching between different frequency range to improve in mixed cell.
Technical scheme of the present invention is:
A kind of method of switching between frequency range of carrying out in mixed cell comprises:
1) the BCCH frequency with mixed cell self is configured in the Neighboring Cell List of this sub-district;
2) travelling carriage obtains this Neighboring Cell List, the signal strength signal intensity of each BCCH frequency and measurement result reported in the detection list;
3) system obtains this sub-district BCCH frequency range signal intensity, and according to the frequency range that calling was positioned at of travelling carriage, corresponding hand-off process is carried out in the calling of travelling carriage,
Wherein, step 3) comprises: the nearby region measurement information that system reports by travelling carriage is obtained the BCCH frequency band signals intensity of this sub-district, judges whether the calling of travelling carriage is positioned at the BCCH frequency range:
3a) if the calling of travelling carriage is positioned on the non-BCCH frequency range channel, system is a foundation with this sub-district BCCH frequency range signal intensity of being obtained, will call out from non-BCCH frequency range channel and switch to BCCH frequency range channel;
3b) if the calling of travelling carriage is positioned on the BCCH frequency range channel, non-BCCH frequency range signal intensity is judged with this sub-district BCCH frequency range signal intensity of being obtained by system, on this basis, in conjunction with concrete business demand, will call out from BCCH frequency range channel and switch to non-BCCH frequency range channel.
Wherein, judge step 3b) and follow: non-BCCH frequency range signal intensity and BCCH frequency range signal intensity are positive correlation.
Above-mentioned steps 3b) in, preferably switch to: system will be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force.
In addition, at step 3a) in, when system will call out when the channel of non-BCCH frequency range switches to the channel of BCCH frequency range, the signal strength signal intensity of going back the non-BCCH frequency range of portability channel to new channel, the foundation when switching once more.
Such scheme is at step 3b) in, if the calling of travelling carriage is positioned on the BCCH frequency range channel, and
3b-1) if call out the signal strength signal intensity that carries non-BCCH frequency range channel, system judges whether the signal strength signal intensity of entrained non-BCCH frequency range channel is lower than the thresholding of setting earlier, and according to judged result, in conjunction with concrete business demand, corresponding hand-off process is carried out in calling to travelling carriage;
3b-2) if call out the signal strength signal intensity that does not carry non-BCCH frequency range channel, non-BCCH frequency range signal intensity is judged with this sub-district BCCH frequency range signal intensity of being obtained by system, on this basis, in conjunction with concrete business demand, will call out from BCCH frequency range channel and switch to non-BCCH frequency range channel.
Wherein, step 3b-1) in,
If the signal strength signal intensity of calling out the non-BCCH frequency range channel that carries is lower than the thresholding of setting, then at the appointed time, forbid calling out the channel that switches back non-BCCH frequency range;
If the signal strength signal intensity of calling out the non-BCCH frequency range channel carry is not less than the thresholding of setting, then will be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force.
Wherein, step 3b-2) in, described judgement is followed: non-BCCH frequency range signal intensity and BCCH frequency range signal intensity are positive correlation.
At step 3b-2) in, preferably switch to: system will be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force.
Adopt technique scheme, beneficial technical effects of the present invention is: because the BCCH frequency of Serving cell self is configured as special " adjacent area ", can solve completely when calling out when being in non-BCCH frequency range, can't know the problem of BCCH frequency band signals intensity.When calling is in non-BCCH frequency range, can switch accurately, reduce blindness.In addition, when calling is in the BCCH frequency range,, adopt the present invention program also can promote success rate for switching and accuracy to greatest extent although can't accurately know the real-time signal strength of non-BCCH frequency range.
Description of drawings
Fig. 1 is a kind of flow charts of switching between frequency range of carrying out in mixed cell of embodiments of the invention.
Embodiment
Key of the present invention is that system is configured to the BCCH frequency of mixed cell self in the Neighboring Cell List of this sub-district in advance, travelling carriage is known this Neighboring Cell List by cycle playing system message, the signal strength signal intensity of each BCCH frequency and measurement result reported in the cycle detection tabulation, the result that system reports according to travelling carriage, call out residing frequency range in conjunction with travelling carriage, travelling carriage is done corresponding hand-off process; When calling is in the channel of non-BCCH frequency range, can obtain the BCCH frequency range signal intensity by the metrical information that travelling carriage reports, as the foundation of accurate switching; When calling out in the sub-district when the channel of non-BCCH frequency range switches to the channel of BCCH frequency range, the signal strength signal intensity of going back the non-BCCH frequency range of portability channel to new channel, the foundation when switching once more.When calling is in the channel of BCCH frequency range, can be according to actual business requirement, the channel that switches to non-BCCH frequency range from the channel of BCCH frequency range will be called out, this sub-district BCCH frequency range signal intensity that system passes through to be obtained is judged non-BCCH frequency range signal intensity, promotes success rate for switching and accuracy to greatest extent.
The present invention will be further described below in conjunction with accompanying drawing;
A kind of method of switching between frequency range of carrying out in mixed cell, flow process comprises the steps: as shown in Figure 1
1) the BCCH frequency with mixed cell self is configured in the Neighboring Cell List of this sub-district; Just sub-district self is configured as one special " adjacent area ", though this can take position, an adjacent area, the benefit that it brings is even more important.
2) MS (Mobile Station, travelling carriage) is known this Neighboring Cell List by cycle playing system message, the signal strength signal intensity of each BCCH frequency and measurement result reported in the cycle detection tabulation;
3) the nearby region measurement information that reports by MS of system is obtained this sub-district BCCH frequency range signal intensity, and judges to call out whether be positioned on the BCCH frequency range;
3a) if call out on non-BCCH frequency range channel:, therefore can carry out switching on this basis from non-BCCH frequency range channel to BCCH frequency range channel because system has accurately obtained this sub-district BCCH frequency range signal intensity.When switching, also the signal strength signal intensity of non-BCCH frequency range channel is taken on the new channel to the foundation when switching once more.
3b) if call out on BCCH frequency range channel: sometimes system also needs to carry out switching from BCCH frequency range channel to non-BCCH frequency range channel for purposes such as balance telephone traffics.At this moment, further judge to call out whether carry non-BCCH frequency range signal intensity;
3b-1) if call out the signal strength signal intensity that carries non-BCCH frequency range channel, that is to say, once switched to BCCH frequency range channel by non-BCCH frequency range channel before this calling, then system serves as according to carrying out switching processing with the signal strength signal intensity of entrained non-BCCH frequency range channel;
System judges whether the signal strength signal intensity of entrained non-BCCH frequency range channel is lower than the thresholding of setting earlier:
If then execution in step 4), at the appointed time, forbid calling out the channel that switches back non-BCCH frequency range;
If not, direct execution in step 5 then), will be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force, can avoid table tennis to switch or handoff failure like this.
3b-2) if call out the signal strength signal intensity that does not carry non-BCCH frequency range channel, non-BCCH frequency range signal intensity is just judged with this sub-district BCCH frequency range signal intensity of being obtained by system, it is generally acknowledged during judgement that non-BCCH frequency range signal intensity and BCCH frequency range signal intensity are positive correlation, the signal that is the strong local non-BCCH frequency range of BCCH signal is also corresponding stronger, system promptly can this as switch to the basis for estimation of non-BCCH frequency range from the BCCH frequency range.In conjunction with concrete business demand, for example in order to alleviate the traffic load of BCCH frequency range, system can be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force, so just can guarantee success rate for switching basically and switch the stability of back conversation.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, a kind of method of switching between frequency range of carrying out in mixed cell is characterized in that, comprising:
1) the BCCH frequency with mixed cell self is configured in the Neighboring Cell List of this sub-district;
2) travelling carriage obtains this Neighboring Cell List, the signal strength signal intensity of each BCCH frequency and measurement result reported in the detection list;
3) system obtains this sub-district BCCH frequency range signal intensity, obtain the BCCH frequency band signals intensity of this sub-district by the nearby region measurement information that travelling carriage reports, whether the calling of judging travelling carriage is positioned at the BCCH frequency range, and according to the frequency range that calling was positioned at of travelling carriage, corresponding hand-off process is carried out in calling to travelling carriage, and described switching comprises:
3a) if the calling of travelling carriage is positioned on the non-BCCH frequency range channel, system is a foundation with this sub-district BCCH frequency range signal intensity of being obtained, will call out from non-BCCH frequency range channel and switch to BCCH frequency range channel;
3b) if the calling of travelling carriage is positioned on the BCCH frequency range channel, non-BCCH frequency range signal intensity is judged with this sub-district BCCH frequency range signal intensity of being obtained by system, on this basis, will call out from BCCH frequency range channel and switch to non-BCCH frequency range channel.
2, the method switched between frequency range of in mixed cell, carrying out according to claim 1, it is characterized in that: the system message that travelling carriage was reported by the cycle is known this Neighboring Cell List, the signal strength signal intensity of each BCCH frequency and measurement result reported in the cycle detection tabulation.
3, the method switched between frequency range of carrying out in mixed cell according to claim 1 is characterized in that: judge step 3b) and follow: non-BCCH frequency range signal intensity and BCCH frequency range signal intensity are positive correlation.
4, the method switched between frequency range of carrying out in mixed cell according to claim 3 is characterized in that: step 3b), system will be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force.
5, the method switched between frequency range of in mixed cell, carrying out according to claim 1, it is characterized in that: step 3a), when system will call out when the channel of non-BCCH frequency range switches to the channel of BCCH frequency range, the signal strength signal intensity of also carrying non-BCCH frequency range channel to new channel, the foundation when switching once more.
6, the method switched between frequency range of in mixed cell, carrying out according to claim 5, it is characterized in that: step 3b), if the calling of travelling carriage is positioned on the BCCH frequency range channel, then further judges and call out the signal strength signal intensity that whether carries non-BCCH frequency range channel:
3b-1) if call out the signal strength signal intensity carry non-BCCH frequency range channel, system judges whether the signal strength signal intensity of entrained non-BCCH frequency range channel is lower than the thresholding of setting earlier, and according to judged result to travelling carriage calling carry out corresponding hand-off process;
3b-2) if call out the signal strength signal intensity that does not carry non-BCCH frequency range channel, non-BCCH frequency range signal intensity is judged with this sub-district BCCH frequency range signal intensity of being obtained by system, on this basis, will call out from BCCH frequency range channel and switch to non-BCCH frequency range channel.
7, the method switched between frequency range of carrying out in mixed cell according to claim 6 is characterized in that: step 3b-1),
If the signal strength signal intensity of calling out the non-BCCH frequency range channel that carries is lower than the thresholding of setting, then at the appointed time, forbid calling out the channel that switches back non-BCCH frequency range;
If the signal strength signal intensity of calling out the non-BCCH frequency range channel carry is not less than the thresholding of setting, then will be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force.
8, the method switched between frequency range of carrying out in mixed cell according to claim 6, it is characterized in that: step 3b-2), described judgement is followed: non-BCCH frequency range signal intensity and BCCH frequency range signal intensity are positive correlation.
9, the method switched between frequency range of carrying out in mixed cell according to claim 8 is characterized in that: step 3b-2), system will be positioned at calling on the BCCH frequency range by signal strength signal intensity by switching to one by one on the non-BCCH frequency range to weak by force.
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| CN111211851B (en) * | 2019-12-23 | 2022-05-06 | 京信网络系统股份有限公司 | Frequency band switching method and device, computer equipment and computer readable storage medium |
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