CN1826010A - Traffic controlling method and relative apparatus - Google Patents
Traffic controlling method and relative apparatus Download PDFInfo
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- CN1826010A CN1826010A CNA2005100088988A CN200510008898A CN1826010A CN 1826010 A CN1826010 A CN 1826010A CN A2005100088988 A CNA2005100088988 A CN A2005100088988A CN 200510008898 A CN200510008898 A CN 200510008898A CN 1826010 A CN1826010 A CN 1826010A
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Abstract
This invention relates to an interaction control method and related devices, in which, said method includes: first of all, a user device tests the intensity of a first pilot signal transmitted by a first base station having the maximum pilot signal intensity then designs an interaction parameter used by the device dynamically to decide the interaction critical value, besides, when the sum of the pilot signal intensities sent by other base stations is smaller than a defined value apart from the first base station, the interaction parameter is adjusted. This method can be embodied in entity media in the program code way, when the code is loaded and executed by a machine, the machine becomes the device for practicing it.
Description
Technical field
The invention relates to telecommunication management, and be particularly to a kind of handover (Handoff) control method, and relevant apparatus.
Background technology
In the communication system of the third generation, as global system for mobile communications (Universal MobileTelecommunications System, UMTS) in, user's equipment (User Equipment, UE), as mobile phone, can be by measuring Common Pilot Channel (the Common PilotChannel that a base station is sent, the intensity (Strength) of a pilot signal CPICH) (Pilot Signal) is to determine the signal strength signal intensity of this base station.After the signal strength signal intensity of this base station of decision, user's equipment as mobile phone, can determine whether this base station will be added in the efficient set (Active Set), and judge whether to carry out soft handoff (Soft Handoff), to provide communication service by new base station.
Owing to can obtain diversity gain (Diversity Gain) when soft handoff, and diversity gain can make transmission energy (Power) minimizing of user's equipment in the up link (Up Link), thereby makes the total interference in the up link to reduce.Therefore, by soft handoff, user's equipment can obtain preferable line quality.On the other hand, a base station communicates owing to user's equipment when soft handoff can be followed not only, user's equipment can be obtained preferable gathering guiding intensity (assembling guiding intensity (Ec)/total received energy (Io), (Ec/Io)), and it also means preferable line quality.
Fig. 1 is that a schematic diagram is the handover threshold value that shows known global system for mobile communications.Wherein, the handover threshold value comprises that an adding threshold value (Tr_add) removes threshold value (Tr_drop) with one.When the intensity of the pilot signal of the base station outside effective set greater than after adding threshold value one given time, then this base station will be added among the efficient set.When the intensity of the pilot signal of the base station in effective set less than after removing threshold value one given time, then this base station will be removed from efficient set.In addition, the handover threshold value also can comprise an exchange threshold value (Tr_swap) (not showing among Fig. 1).When the capacity of effective set is expired, if the intensity of the pilot signal that the outer base station of efficient set is sent is greater than after exchange threshold value one given time, then this base station is added in the efficient set, and from efficient set, the intensity of the pilot signal sent is removed for the most weak base station.
Yet user's equipment will use more system resources when carrying out soft handoff, and gives user's equipment because a plurality of base stations transmit energy simultaneously, so the total interference in the down link (Down Link) (total received energy) will increase.Because the total interference in the down link increases, other user's equipment will be disturbed and make the line quality reduce (assembling guiding intensity reduces) in the system.Because the handover threshold value in the known global system for mobile communications is fixed, therefore, along with the reduction (reduction of optimum waveguide traction intensity) of line quality, the handover threshold value also can decrease, and as shown in Figure 1, thereby makes many unnecessary soft handoffs take place.Therefore, when user's equipment when carrying out soft handoff, must provide mechanism to guarantee that handover is useful and can not be corrupted to the line quality of other user's equipment.
Summary of the invention
In view of this, the present invention is with the problem that solves aforementioned handover control.
Therefore, purpose of the present invention is for providing a kind of handover control method and the relevant apparatus that can dynamically adjust the handover threshold value according to the line quality.
In order to reach above-mentioned purpose of the present invention, the invention provides a kind of handover control method.At first, the intensity of first pilot signal of being sent with one first base station in user's device measuring one efficient set, wherein this first base station has maximum pilot signal strength.Afterwards,, dynamically set the handover parameter that user's equipment carries out a handover according to the intensity of this first pilot signal, and according to handover parameter decision handover threshold value.
In addition, when in effective set except this first base station, the summation of the intensity of the pilot signal that other base station sent is more adjusted the handover parameter during less than a set value.
Said method of the present invention can be included in tangible media by program code means.When program code was loaded and carries out by machine, machine became in order to carry out device of the present invention.
By enforcement of the present invention, solved the problem of handover control, make user's equipment when carrying out soft handoff, not only guaranteed that handover is useful but also strengthened the line quality of user's equipment.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, embodiment cited below particularly, and cooperate appended icon, it is as follows to be elaborated.
Description of drawings
Fig. 1 is that a schematic diagram is the handover threshold value that shows known global system for mobile communications;
Fig. 2 is that a schematic diagram is the user's equipment that shows according to the embodiment of the invention;
Fig. 3 is that a flow chart is the handover parameter setting method that shows according to one embodiment of the invention;
Fig. 4 is that a flow chart is the delivering method that shows according to one embodiment of the invention;
Fig. 5 is that a schematic diagram is the handover threshold value that shows according to the global system for mobile communications of one embodiment of the invention;
Fig. 6 is that a flow chart is the handover parameter regulation means that shows according to one embodiment of the invention;
Fig. 7 is that a schematic diagram is the analog result that shows according to one embodiment of the invention;
The 8th figure is that a flow chart is the handover parameter setting and adjustment example that shows according to one embodiment of the invention.
Symbol description:
Tr_add adds threshold value;
Tr_drop removes threshold value;
210 user's equipment;
211 processing units;
212 inventories;
221,222 base stations;
S310, S320, S330 operating procedure;
S410, S420 ..., the S480 operating procedure;
S610, S620 operating procedure;
S810, S820 ..., the S880 operating procedure.
Embodiment
The invention provides the problem that novel method and apparatus overcomes aforementioned handover control.
Fig. 2 is that a schematic diagram is the user's equipment that shows according to the embodiment of the invention.As shown in the figure, user's equipment 210 as mobile phone, comprises a processing unit 211 at least, in order to carry out the relevant operation with other of handover control of the embodiment of the invention.User's equipment 210 must be measured the intensity of the pilot signal that a plurality of base station sent, to obtain effectively (Active) base station inventory 212.User's equipment 210 can judge whether and will carry out handover between different base stations (for example, 221 and 222) according to communication quality, to provide communication service by the base station with stronger pilot signal.
Fig. 3 is that a flow chart is the handover parameter setting method that shows according to one embodiment of the invention.At first, as step S310, user's equipment 210 is measured the intensity of first pilot signal that one first base station is sent in the efficient set, and wherein first base station has maximum pilot signal strength.Then,,, dynamically set the handover parameter that user's equipment 210 carries out a handover according to the intensity of first pilot signal as step S320, and as step S330, according to handover parameter decision handover threshold value.Wherein, the handover parameter can comprise repayment scope (Reporting Range), magnetic hysteresis (Hysteresis) parameter, replace magnetic hysteresis (Replacement Hysteresis) parameter, with the triggered time (Time to Trigger (TtT)).In addition, the handover threshold value can comprise add threshold value (Tr_add), remove threshold value (Tr_drop), with exchange threshold value (Tr_swap).The formula of its decision is:
Tr_add＝Best_Ss_AS_Th+AS_Th_Hyst，
Tr_drop＝Best_Ss-AS_Th-AS_Th_Hyst，
Tr_swap＝Worst_Old_Ss+AS_Rep_Hyst。
Wherein, Tr_add is that to remove threshold value, Tr_swap be that pilot signal strength, Worst_Old_Ss the strongest in the efficient set is that pilot signal strength, AS_Th the most weak in the efficient set is that repayment scope, AS_Th_Hyst are that magnetic hysteresis parameter and AS_Rep_Hyst are for replacing the magnetic hysteresis parameter for exchange threshold value, Best_Ss for adding threshold value, Tr_drop.
Fig. 4 is that a flow chart is the delivering method that shows according to one embodiment of the invention.At first, as step S410, the intensity of user's equipment 210 measurement pilot signals.Afterwards, as step S420, judge pilot signal whether in efficient set, and whether the intensity of pilot signal surpasses the triggered time less than the time that removes threshold value.("No" of step S420) if not then carries out the operation of step S440.(if the "Yes" of step S420), as step S430, with this pilot signal by removing in the efficient set.Then, as step S440, judge pilot signal whether not in efficient set, and whether the intensity of pilot signal surpasses the triggered time greater than the time that adds threshold value.("No" of step S440) then gets back to step S410 if not.If ("Yes" of step S440) as step S450, judges whether efficient set has reached a both constant volume (full).("No" of step S450) if not as step S460, directly adds this pilot signal among the efficient set, and gets back to step S410.When if the capacity of efficient set is full ("Yes" of step S450),, judge whether the intensity of pilot signal surpasses the triggered time greater than the time that exchanges threshold value as step S470.("No" of step S470) then gets back to step S410 if not.If ("Yes" of step S470) as step S480, exchanges pilot signal the most weak in this pilot signal and the efficient set.
In the above-described embodiments, when the intensity of pilot signal the strongest in effective set was more weak, repayment scope and triggered time can be set at smaller value.For instance,, the repayment scope is made as 5dB, will the triggered time be made as 0.8sec when the intensity of strong waveguide frequency signal in effective set during greater than-6dB.When intensity be not less than-during 10dB and being not more than-6dB, the repayment scope is made as 4dB, will the triggered time be made as 0.8sec.When intensity during less than-10dB, the repayment scope is made as 3dB, will the triggered time be made as 0.4sec.In addition, in one embodiment, the magnetic hysteresis parameter of the strong waveguide frequency signal of corresponding varying strength with replace the magnetic hysteresis parameter and can be made as 1dB.
Because total interference increase will make indivedual gatherings guiding intensity of user's equipment 210 reduce in the down link, and then makes the line quality reduce.Therefore, the embodiment of the invention is dynamically set the handover threshold value that user's equipment 210 judges whether to carry out handover by the power according to the strongest pilot signal, carries out unnecessary handover to avoid user's equipment 210.Fig. 5 is that a schematic diagram is the handover threshold value that shows according to the global system for mobile communications of one embodiment of the invention.As shown in the figure, when the strength reduction of the strongest pilot signal, the handover threshold value will be raised.In addition, when the strength reduction of the strongest pilot signal, and when causing the line quality variation, the time conditions that user's equipment 210 can must meet pilot signal the handover threshold value reduces, as quickly as possible available pilot signal is added in the efficient set, interrupt to avoid line.
Except the time conditions that pilot signal must be met the handover threshold value reduces, the line quality of user's equipment 210 when strengthening the strength reduction when the strongest pilot signal, the embodiment of the invention more can further be adjusted for the handover parameter.Fig. 6 is that a flow chart is the handover parameter regulation means that shows according to one embodiment of the invention.At first, as step S610, judge in the efficient set of user's equipment 210 that whether intensity (Δ) except other pilot signal of the strongest pilot signal is less than a set value, as 2dB.("No" of step S610) if not continues the operation of step S610.If ("Yes" of step S610) as step S620, adjusted the handover parameter.Afterwards, return step S610.Wherein, the mode of adjustment is that repayment scope and magnetic hysteresis parameter are increased by a set value simultaneously, as 0.5dB, and will replace the magnetic hysteresis parameter and be made as a updating value, as 0.5dB.Wherein, because repayment scope and magnetic hysteresis parameter increase by a set value simultaneously, therefore, adding threshold value will can not change, will reduce with the exchange threshold value and remove threshold value, make that more weak pilot signal is unlikely to be moved out of or to exchange out efficient set in the efficient set.
Fig. 8 is that a flow chart is the handover parameter setting and adjustment example that shows according to one embodiment of the invention.At first, as step S810, whether the intensity (Best_Ss) of judging pilot signal the strongest in the efficient set is greater than-6dB.If the intensity (Best_Ss) of the strongest pilot signal is greater than-6dB ("Yes" of step S810), as step S820, setting repayment scope (AS_Th) is 5dB, magnetic hysteresis parameter (AS_Th_Hyst) is 1dB, replacing magnetic hysteresis parameter (AS_Rep_Hyst) is 1dB, and the triggered time (TtT) is 0.8sec.If the intensity (Best_Ss) of the strongest pilot signal is greater than-6dB ("No" of step S810), as step S830, whether the intensity (Best_Ss) of judging pilot signal the strongest in the efficient set is less than-10dB.If the intensity (Best_Ss) of the strongest pilot signal is not less than-10dB ("No" of step S830), as step S840, setting repayment scope (AS_Th) is 4dB, magnetic hysteresis parameter (AS_Th_Hyst) is 1dB, replacing magnetic hysteresis parameter (AS_Rep_Hyst) is 1dB, and the triggered time (TtT) is 0.8sec.If the intensity (Best_Ss) of the strongest pilot signal is less than-10dB ("Yes" of step S830), as step S850, setting repayment scope (AS_Th) is 3dB, magnetic hysteresis parameter (AS_Th_Hyst) is 1dB, replacing magnetic hysteresis parameter (AS_Rep_Hyst) is 1dB, and the triggered time (TtT) is 0.4sec.
After the handover parameter is dynamically set according to the intensity of the strongest pilot signal, just can carry out the adjustment of handover parameter and handle.As step S860, the number (CS) of judging pilot signal in the efficient set whether greater than 1 and efficient set in except the intensity (Δ) of other pilot signal of the strongest pilot signal whether less than 2dB.("No" of step S860) if not then directly carries out the operation of step S880.(if the "Yes" of step S860), as step S870, readjust the handover parameter, to set the repayment scope is that the repayment scope adds 0.5dB (AS_Th=AS_Th+0.5dB), the magnetic hysteresis parameter adds 0.5dB (AS_Th_Hyst=AS_Th_Hyst+0.5dB) for the magnetic hysteresis parameter, and replacement magnetic hysteresis parameter (AS_Rep_Hyst) is 0.5dB.Then, as step S880, according to handover parameter decision handover threshold value.Wherein, Tr_add=Best_Ss-AS_Th+AS_Th_Hyst, Tr_drop=Best_Ss-AS_Th-AS_Th_Hyst, and Tr_swap=Worst_Old_Ss+AS_Rep_Hyst.Afterwards, flow process is got back to step S810, judges again.
Fig. 7 is that a schematic diagram is the analog result that shows according to one embodiment of the invention.In this simulation, supposing has 6 user's equipment in 19 communication units (Cell), and each communication unit has 3 sections (Section).Wherein, Zhong Jian communication unit is in order to carry out the usefulness statistical learning.Reproduction model (Propagation Model) is action frequency (Cellular Band), Hata model.LognormalFading is 400 meters a corrected range, and the variation of 8dB (Variance).In addition, the handover parameter of known global system for mobile communications is: the repayment scope is 5dB, and the magnetic hysteresis parameter is 1dB, and replacing the magnetic hysteresis parameter is 3dB, and the triggered time is 0.8sec, and the capacity of efficient set is 3.Be 200ms whole sample time.As shown in the figure, the average gathering pilot signal strength difference most of the time of the embodiment of the invention and known technology all be on the occasion of, in other words, the embodiment of the invention can obtain pilot signal strength and the line quality better than known technology.
Therefore, the invention provides a kind of handover control method and the relevant apparatus that can dynamically adjust the handover threshold value according to the line quality.
Method and system of the present invention, or specific kenel or its part, can be contained in tangible media with the kenel of program code, get (as embodied on computer readable) Storage Media as floppy disk, discs, hard disk or any other machine readable, wherein, when program code by machine, when loading and carrying out as computer, this machine becomes in order to participate in device of the present invention.Method and apparatus of the present invention also can be with the program code kenel by some transfer mediums, transmit as electric wire or cable, optical fiber or any transmission kenel, wherein, when program code by machine, when receiving, loading and carrying out as computer, this machine becomes in order to participate in device of the present invention.When the general service processor is done in fact, the program code associative processor provides a class of operation to be similar to the unique apparatus of using particular logic circuit.
Though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; any personage who is familiar with this skill; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when looking being as the criterion that claim defines.
Claims (20)
1. a handover control method is characterized in that comprising the following steps:
The intensity of first pilot signal of being sent with one first base station in user's device measuring one efficient set, wherein this first base station has maximum pilot signal strength;
According to the intensity of this first pilot signal, dynamically set at least one handover parameter that this user's equipment carries out a handover; And
Determine at least one handover threshold value according to this handover parameter.
2. handover control method as claimed in claim 1, it is characterized in that, wherein this handover parameter comprises a repayment scope at least, and when the intensity of this first pilot signal is worth greater than one first, should the repayment scope be made as one second value, when the intensity of this first pilot signal is not less than one the 3rd value and is not more than this first value, should the repayment scope be made as one the 4th value, and when the intensity of this first pilot signal is worth less than the 3rd, should the repayment scope be made as one the 5th value, wherein this first value is not less than the 3rd value, and this second value is not less than the 4th value, and the 4th value is not less than the 5th value.
3. handover control method as claimed in claim 1, it is characterized in that, wherein this handover parameter comprises a triggered time at least, and when the time that the intensity of one second pilot signal meets this handover threshold value reaches this triggered time, for this second pilot signal carry out mutually should the handover threshold value a set operation.
4. handover control method as claimed in claim 3, it is characterized in that more comprising that working as this handover threshold value is an adding threshold value, and this second pilot signal is not in this efficient set the time, if the intensity of this second pilot signal is higher than the time of this adding threshold value when reaching this triggered time, this second pilot signal is added this efficient set.
5. handover control method as claimed in claim 3, it is characterized in that more comprising when this handover threshold value be one to remove threshold value, and this second pilot signal is in this efficient set the time, if the intensity of this second pilot signal is lower than the time of this adding threshold value when reaching this triggered time, this second pilot signal is shifted out this efficient set.
6. handover control method as claimed in claim 3, it is characterized in that more comprising that working as this handover threshold value is an exchange threshold value, this efficient set has reached a both constant volume, and this second pilot signal is not in this efficient set the time, if the intensity of this second pilot signal is higher than the time of this exchange threshold value when reaching this triggered time, with this second pilot signal and in this efficient set the most weak one the 3rd pilot signal of intensity exchange.
7. handover control method as claimed in claim 3, when it is characterized in that more comprising that intensity when this first pilot signal is greater than one the 6th value, this triggered time is made as one the 7th value, when the intensity of this first pilot signal is not less than one the 8th value and is not more than the 6th value, this triggered time is made as one the 9th value, and when the intensity of this first pilot signal is worth less than the 8th, this triggered time is made as 1 the tenth value, wherein the 6th value is not less than the 8th value, the 7th value is not less than the 9th value, and the 9th value is not less than the tenth value.
8. handover control method as claimed in claim 1 when it is characterized in that more comprising that intensity when other pilot signal outside this first pilot signal in this efficient set is less than a set value, is then adjusted described handover parameter.
9. handover control method as claimed in claim 8, it is characterized in that, wherein said handover parameter comprises a repayment scope and a magnetic hysteresis parameter at least, and when the intensity of the 4th pilot signal in this efficient set during less than this set value, should the repayment scope and this magnetic hysteresis parameter increase by a set value simultaneously.
10. handover control method as claimed in claim 8, it is characterized in that, wherein said handover parameter comprises that at least having one of an original value replaces the magnetic hysteresis parameter, and when the intensity of the 4th pilot signal in this efficient set during less than this set value, should replace the magnetic hysteresis parameter and be made as a updating value, wherein this updating value is less than this original value.
11. a device is characterized in that comprising at least:
One efficient set comprises one first base station at least, and wherein first pilot signal sent of this first base station has maximum pilot signal strength; And
One processing unit in order to measure the intensity of this first pilot signal, according to the intensity of this first pilot signal, is dynamically set at least one handover parameter that this device carries out a handover, and is determined at least one handover threshold value according to this handover parameter.
12. device as claimed in claim 11, it is characterized in that, wherein this handover parameter comprises a repayment scope at least, and when this processing unit is worth greater than one first when the intensity of this first pilot signal, should the repayment scope be made as one second value, when the intensity of this first pilot signal is not less than one the 3rd value and is not more than this first value, should the repayment scope be made as one the 4th value, and when the intensity of this first pilot signal is worth less than the 3rd, should the repayment scope be made as one the 5th value, wherein this first value is not less than the 3rd value, and this second value is not less than the 4th value, and the 4th value is not less than the 5th value.
13. device as claimed in claim 11, it is characterized in that, wherein said handover parameter comprises a triggered time at least, and when this processing unit reaches this triggered time when the time that the intensity of one second pilot signal meets this handover threshold value, for this second pilot signal carry out mutually should the handover threshold value a set operation.
14. device as claimed in claim 13, it is characterized in that more comprising that working as this handover threshold value is an adding threshold value (Tr-add), and this second pilot signal is not in this efficient set the time, if the intensity of this second pilot signal is higher than the time of this adding threshold value when reaching this triggered time, this processing unit adds this efficient set with this second pilot signal.
15. device as claimed in claim 13, it is characterized in that more comprising when this handover threshold value be one to remove threshold value, and this second pilot signal is in this efficient set the time, if the intensity of this second pilot signal is lower than the time of this adding threshold value when reaching this triggered time, this processing unit shifts out this efficient set with this second pilot signal.
16. device as claimed in claim 13, it is characterized in that more comprising that working as this handover threshold value is an exchange threshold value, this efficient set has reached a both constant volume, and this second pilot signal is not in this efficient set the time, if the intensity of this second pilot signal is higher than the time of this exchange threshold value when reaching this triggered time, this processing unit with this second pilot signal and in this efficient set the most weak one the 3rd pilot signal of intensity exchange.
17. device as claimed in claim 13, it is characterized in that, when wherein this processing unit comprises that more intensity when this first pilot signal is greater than one the 6th value, this triggered time is made as one the 7th value, when the intensity of this first pilot signal is not less than one the 8th value and is not more than the 6th value, this triggered time is made as one the 9th value, and when the intensity of this first pilot signal is worth less than the 8th, this triggered time is made as 1 the tenth value, wherein the 6th value is not less than the 8th value, the 7th value is not less than the 9th value, and the 9th value is not less than the tenth value.
18. device as claimed in claim 11, when it is characterized in that more comprising that intensity when other pilot signal outside this first pilot signal in this efficient set is less than a set value, this processing unit is adjusted described handover parameter.
19. device as claimed in claim 18, it is characterized in that, wherein this handover parameter comprises a repayment scope and a magnetic hysteresis parameter at least, and when the intensity of the 4th pilot signal in this efficient set during less than this set value, this processing unit should the repayment scope and this magnetic hysteresis parameter increase by a set value simultaneously.
20. device as claimed in claim 18, it is characterized in that, wherein these handover parameters comprise that at least having one of an original value replaces the magnetic hysteresis parameter, and when the intensity of the 4th pilot signal in this efficient set during less than this set value, this processing unit should replace the magnetic hysteresis parameter and be made as a updating value, and wherein this updating value is less than this original value.
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| CNB2005100088988A CN100459791C (en) | 2005-02-24 | 2005-02-24 | Traffic controlling method and relative apparatus |
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| CNB2005100088988A CN100459791C (en) | 2005-02-24 | 2005-02-24 | Traffic controlling method and relative apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105025534A (en) * | 2014-04-15 | 2015-11-04 | 财团法人资讯工业策进会 | Base station and hand-off method thereof |
| CN101237262B (en) * | 2007-01-30 | 2016-07-06 | 世意法（北京）半导体研发有限责任公司 | The active set method of the transformation that peak-to-average power ratio reduces is realized by retaining tone |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5812540A (en) * | 1996-11-06 | 1998-09-22 | Motorola, Inc. | Method and apparatus for mitigating an orphan condition in a spread-spectrum communication system |
| US6055428A (en) * | 1997-07-21 | 2000-04-25 | Qualcomm Incorporated | Method and apparatus for performing soft hand-off in a wireless communication system |
| KR100265584B1 (en) * | 1997-07-22 | 2000-09-15 | 정태기 | Method of handoff control in the mobile communication system |
| US6754493B1 (en) * | 1998-12-18 | 2004-06-22 | Telefonaktiebolaget Lm Ericsson | Method and systems for dynamic threshold adjustment for handoffs in radio communication systems |
| US7123916B2 (en) * | 2000-07-25 | 2006-10-17 | Denso Corporation | Handoff adaptation for CDMA systems |
| GB0028112D0 (en) * | 2000-11-17 | 2001-01-03 | Univ Surrey | A method of performing soft handover in a mobile communications system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237262B (en) * | 2007-01-30 | 2016-07-06 | 世意法（北京）半导体研发有限责任公司 | The active set method of the transformation that peak-to-average power ratio reduces is realized by retaining tone |
| CN105025534A (en) * | 2014-04-15 | 2015-11-04 | 财团法人资讯工业策进会 | Base station and hand-off method thereof |
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