CN100393171C - Method and equipment for raising call completing rate in code division multiple access mobile communication system - Google Patents
Method and equipment for raising call completing rate in code division multiple access mobile communication system Download PDFInfo
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Abstract
The present invention discloses a method and a device for increasing access success ratios in a code division multiple access mobile communication system. In the primary stage of call establishment, when a mobile station uses an open loop power control mode, a base station judges the quality of a forward link on the basis of the strength Ec/Io of pilot frequency signals of a receiving terminal reported by the mobile station; under the condition that the forward link weakens, the side of the base station adjusts the transmitting power and the transmitting times of a signaling frame pointing to a specific mobile station on a paging channel and the transmitting power of an initial service frame on a forward service channel in time to satisfy the requirements of the mobile station for the receiving quality of the channels as far as possible, so the processing of a normal call flow is not influenced, and the access success ratio is increased. The present invention is characterized in that the present invention is suitable for call access regions with unbalanced forward and reverse links caused by wireless environmental factors of the rapid fading or the stroke interference, etc. of the forward link.
Description
Technical field
The present invention relates to CDMA mobile communication systems, success rate is connected in a kind of raising that relates in particular in the CDMA mobile communication systems, improves the method and the equipment thereof of the failure problem that continues.
Background technology
Mobile communication is the most active in the current communication, development one of field the most rapidly, in 21 century human lives and social development is had significant impact.Code division multiple access is a CDMA technology owing to have characteristics such as frequency efficiency height, antijamming capability are strong, has become a kind of digital mobile communication standard that is rich in competitiveness.Along with carrying out in a deep going way that the CDMA mobile network builds, the user improves day by day to the requirement of network quality.
The call completing rate index of wireless network is with the most direct susceptibility that has influence on the user.System operator mainly solves covering and capacity problem at the networking initial stage.Finish on the preliminary basis of building of network, improving call completing rate is one of target of each operator's pursuit.
On land during mobile communication, travelling carriage usually is operated in architecture ensemble and various terrain and its features comparatively in the complex environment, and the characteristic of its transmission channel changes whenever and wherever possible, so mobile channel is typical accidental channel.Uhf band (300～3000MHz), the radio wave propagation mode has direct wave (line-of-sight propagation), ground-reflected wave and the various barrier reflected wave of (comprising building, various vehicle) (also claiming scattering sometimes), thus make wireless channel changeable and be difficult to control.Because signaling frame and traffic frame all are to transmit time so reception success rate preceding, that the residing wireless environment variation of backward channel will directly influence frame by wireless channel.
In cdma communication system, when carrying out the network planning and link budget,, obtain wireless coverage by calculating the factor of preceding anti-Radio Link gain of some influences and loss.The target of this budget programing is that the reverse link coverage is basic identical before making, and the loss of signal that reverse link is subjected to equals and is similar to the loss that forward link is subjected to, and guarantees the two-way equilibrium, to reach the purpose of correct demodulation signaling frame of receiving terminal or traffic frame.But because the irrelevance of preceding reverse link, can't estimate the rapid fading characteristic of two-way wireless channel during link budget, and other bursty interference sources are to influences such as two paths of signals transmission, thereby cause system link unbalanced, cause system performance degradation.
In cdma system the variation of taking into account system load, channel status fast and the decline of variation at a slow speed and channel to the influence that signal transmits, adopted two kinds of power control modes of open loop and closed loop, to reach the effect of correct receiving demodulation.Open loop estimates to be meant that travelling carriage only comes rough estimate dissemination channel environment according to what receive from signal of base station intensity, and the back emitted power of corresponding adjustment oneself, is one-side adjustment.But so just ignored the not related fact of forward channel and backward channel, can cause occurring bigger error at short notice, be unable to estimate the influence of factors such as characteristic and strong jamming that decline soon wireless channel.Closed loop calibration is meant on the basis that open loop is estimated, the quick correct transmission power of power control instruction that receives according to receiving terminal, power control instruction wherein (rise or fall) is the loop power controlling emission mechanism that produces after dedicated channel is set up, and is decided according to the quality of its received signal by transmitting terminal.
At the call setup initial stage, owing to do not set up Dedicated Traffic Channel and control channel between travelling carriage and the base station, travelling carriage is only taked the open Loop Power control mode.Generally, base station equipment manufacturer is made as fixed value to transmitting power, and the transmitting power of the signaling frame on this channel is identical with the common signaling channel transmitting power, under the fixed situation of coverage, can not change.Load mode to the signaling frame that sends on the common signaling channel is independently set.Simultaneously, for all travelling carriages in this coverage, the base station sends forward dedicated channel initial service frame with identical definite value power.These two kinds of set-up modes, all do not fully take into account under the open loop power control pattern, changeable wireless channel is to the influence of travelling carriage receiving terminal, usually cause forward link to die down because of factors such as the rapid fading of forward channel signal or strong jammings, make travelling carriage can't in time receive forward direction signaling frame or initial service frame, thereby cause the call setup failure, the network completion rate descends.
Consider under the above system divided ring power control condition limitation of forward channel frame control mode, the situation that can cause travelling carriage in time to catch.Therefore, need be according to the channel variation characteristic, at the call setup initial stage (is that travelling carriage uses the open loop power control mode, base station forward common channels power and forward dedicated channel initial power use fixed transmission power), in time adjust forward direction signaling frame and initial service frame send mode, so that travelling carriage can in time be caught, thereby do not influence the processing of normal call flow.This lifting to network quality has very important influence.
Terminological interpretation:
Ec/Io: pilot signal strength
PCH_GAIN: paging channel transmitting power
FDCH_INIT_GAIN: forward traffic channel Initial Trans
PCH_SIG_DELTA_GAIN: point to specific travelling carriage signaling frame compensation power on the paging channel
FDCH_DELTA_GAIN: forward traffic channel initial service frame compensation power
PCH_SIG_GAIN: point to specific travelling carriage signaling frame transmitting power
FDCH_INIT_ADJ_GAIN: forward traffic channel initial service frame transmitting power
PCH_MAX_GAIN: paging channel signaling frame maximum transmission power
FDCH_MAX_GAIN: forward traffic channel initial service frame maximum transmission power
RES_PWR: base station redundant power
PCH_Allowed_Limit: paging channel redundant power thresholding
FDCH_Allowed_Limit: forward traffic channel redundant power thresholding
T_INTF_PCH: paging channel power back-off thresholding
T_INTF_FDCH: forward traffic channel power back-off thresholding
Specific travelling carriage: the base station is carried out the travelling carriage that forward link is judged according to the pilot signal strength Ec/Io of travelling carriage report to it
Summary of the invention
The object of the present invention is to provide a kind of code division multiple access is to improve in the CDMA mobile communication system to connect success rate, improve the method and the equipment thereof of the failure problem that continues, solution dies down because of the forward link that reasons such as forward channel signal rapid fading or strong jamming cause, make travelling carriage can't in time receive forward direction signaling frame or initial service frame, cause the call setup failure, the technical problem that the network completion rate descends.
Technical program of the present invention lies at the call setup initial stage (is that travelling carriage uses the open loop power control mode, base station forward common channels power and forward dedicated channel initial power use fixed transmission power), by detecting the forward link signal quality, whether reverse link is balanced before judging, and according to the timely send mode of forward common channels signaling frame and the send mode of forward dedicated channel initial service frame adjusted of this judgement, increase the probability that travelling carriage successfully receives signaling frame and initial service frame thereby reach, to improve network quality.
The situation that the unbalanced middle forward link of reverse link died down before the present invention related generally to.Wherein forward link mainly comprises forward common channels and forward dedicated channel.
The base station judges according to the mobile station side wireless environment that travelling carriage provides whether forward link dies down.When the forward direction link-quality is lower than channel power compensation thresholding, judge whether forward link dies down, the unbalanced situation of preceding reverse link takes place.
In cdma system mainly paging channel as forward common channels, this channel sends signaling frame.The mobile station side wireless environment that the base station provides according to travelling carriage, the transmitting power of decision signaling frame and transmission number of times.
In cdma system mainly Forward Fundamental Channel as forward dedicated channel, this channel sends initial service frame.The wireless environment of the mobile station side that the base station provides according to travelling carriage, the transmitting power of decision initial service frame.
When travelling carriage is in poor wireless environment, need to strengthen the transmitting power of signaling frame and initial service frame.Simultaneously excessive and influence network capacity for fear of power, need increase amplitude limit condition.
The equilibrium of preceding reverse link is a design object very important in the cdma system.If do not make the system link equilibrium, systematic function will deterioration.At the call setup initial stage, when travelling carriage uses open loop power control, only according to the base station signal strength rough estimate dissemination channel environment that receives, and the back emitted power of corresponding adjustment oneself, ignored the not related fact of forward channel and backward channel, can cause occurring at short notice bigger error, the situations such as characteristic and burst strong jamming that decline soon of being unable to estimate wireless channel (move to the shadow region as travelling carriage in access procedure, zones such as the Zone switched and strong jamming of many pilot tones cell boarder), thereby cause system link unbalanced, cause system performance degradation.Therefore, for the regional call completing rate of improving many cell boarders and wireless environment difference is low, it is unbalanced in preceding reverse link burst to need a kind of mechanism, under the situation that forward link dies down, the send mode of forward frame is in time adjusted in the base station, guarantees that travelling carriage can correctly receive and demodulation.
The present invention proposes the mobile station side wireless environment situation that reports Ec/Io according to moving table measuring, judge whether to take place the situation that forward link dies down.Base station side sends on paging channel when sending the initial service frame on the signaling frame that points to specific travelling carriage and the forward traffic channel, sets a fixing power gain usually and sends.But in the relatively poor zone of wireless environment, this fixing gain can not be satisfied the receiving quality requirement of travelling carriage to forward channel, defective in this design has reduced the probability of travelling carriage successful received frame in abominable wireless environment, and the situation that very likely causes forward link to lose efficacy takes place.Therefore, can correctly receive forward frame in order to guarantee travelling carriage, the base station need in time be adjusted the occurring mode of forward link according to the mobile station side wireless environment.The forward link pilot signal intensity Ec/Io information that travelling carriage provides is the important evidence that forward link quality is judged in the base station.The base station is carried out forward link quality and is judged and power back-off according to the situation of pilot signal strength Ec/Io: when Ec/Io has surpassed the power back-off thresholding, signaling frame and initial service frame are only needed to launch according to fixedly installing power; When Ec/Io less than the power back-off thresholding, need to increase again the compensating gain relevant, the reinforcement transmitting power with Ec/Io.The gain of the difference that is characterized as signaling frame or initial service frame power back-off thresholding and Ec/Io of compensating gain.
Simultaneously,, need to increase the power limiting device, can control the transmitting power of initial service frame on the signaling frame that points to specific travelling carriage on the paging channel and the forward traffic channel because forward power is limited.And the base station according to different receiving terminal quality factors, can adopt different parameter values to be set signaling frame and traffic frame power limiting device respectively.Because CDMA is the self-interference system, high-power emission is a strong jamming to peripheral base station, thereby influences overall system capacity.Therefore, amplitude limit need be carried out to the forward channel transmitting power in the base station, and according to the receiving quality factor requirement of travelling carriage to different channels, signaling frame power maximum and traffic frame power maximum is provided with respectively.This amplitude limit method can improve the call through success rate largely under the situation that does not influence the existing network capacity.
At last, for further improve because of factors such as signal rapid fading or strong jamming cause before reverse link burst unbalanced phenomena, guarantee the reception success rate of frame, the present invention has adopted the mode of continuous transmission 3 times to the signaling frame that points to specific travelling carriage on the paging channel, reduced the probability that causes LOF because of wireless environment variation soon, received success rate thereby improve.
Technique effect
In code division multiple access system, adopt raising call completing rate method of the present invention can obtain following technique effect:
1, among the present invention at the call setup initial stage, travelling carriage is only taked the open Loop Power control mode, be unable to estimate under the situation that the forward link that causes because of wireless environment factors such as channel rapid fading or strong jammings dies down, for remedying the limitation of base station to forward channel frame control mode, adopted wireless environment, decided transmitting power according to the travelling carriage present position.When the residing wireless environment of travelling carriage is bad, improves transmitting power and guarantee that the correct receipt of call control messages of travelling carriage base station sends the initial service frame on signaling message that sends the specific travelling carriage of sensing on the paging channel and forward traffic channel.The method that this pilot signal strength according to the travelling carriage present position calculates call control message can reduce the call proceeding failure that wireless environment causes significantly.This lifting to network quality has very important influence.
2, among the present invention the paging channel signaling frame different power compensators and amplitude limiter have been used with forward traffic channel initial service frame.Because travelling carriage demodulation forward direction signaling frame is different with the quality factor that traffic frame needs, therefore under the bad situation of forward link,, can select different equipment settings according to the quality factor characteristics of signaling frame and traffic frame for guaranteeing that travelling carriage accurately receives.This independent set-up mode, can greatly improve receiving terminal reception success rate does not influence power system capacity simultaneously again.
3, the present invention uses power compensator accurately to calculate transmitting power when decision signaling frame and initial service frame transmitting power.Power compensator is the Ec/Io according to mobile station side, accurately calculates the transmitting power of required signaling frame.This computational methods have guaranteed that promptly travelling carriage can successfully receive signaling message, have avoided the waste owing to the excessive power resource that causes of signaling frame transmitting power again, thereby have further reduced the influence to power system capacity.Power compensator is a kind of sending method of power adaptive.
4, the present invention has used power compensator and power limiting device when decision signaling frame and initial service frame transmitting power, and power back-off thresholding and redundant thresholding.The field optimizing engineer can be optimized these equipment and thresholding according to the on-site wireless network condition, and optimization provides optimization means flexibly to field network.
Below in conjunction with accompanying drawing purpose of the present invention, feature and technique effect are further specified.
Description of drawings
Fig. 1 is the flow chart that call setup is handled in the base station
Fig. 2 is that forward common channels signaling frame power sends the flow chart of number of times and transmitting power in the base station decision call establishment
Fig. 3 is in the base station decision call establishment, the transmitting power flow chart of forward traffic channel initial service frame
Fig. 4 is the wireless signal of base station according to reception, adjusts the transmitting apparatus figure of signaling frame and initial service frame.
Specific implementation method
Fig. 1 is that the call proceeding flow chart is handled in the base station.To the travelling carriage more than the edition 4, the travelling carriage more than the IS-2000 code requirement edition 4 must comprise RER (RadioEnvironment Report) field when sending ORM and PRSP.The pilot signal strength information that has comprised the travelling carriage present position in the RER field.After the ORM or PRSP that comprises the RER field received in the base station, calculate paging channel signaling frame and the required transmitting power of Traffic Channel initial service frame of pointing to specific travelling carriage.As Ec/Io during more than or equal to paging channel power back-off thresholding T_INTF_PCH, point to specific travelling carriage the paging channel signaling frame transmitting power and send number of times and do not adjust; As Ec/Io during, the paging channel signaling frame transmitting power and the frequency that point to specific travelling carriage are adjusted less than T_INTF_PCH.Simultaneously, as Ec/Io during more than or equal to forward traffic channel power back-off thresholding T_INTF_FDCH, the transmitting power of forward traffic channel initial service frame does not compensate; As Ec/Io during, the transmitting power of forward traffic channel initial service frame is adjusted less than T_INTF_FDCH.
Fig. 2 is that the paging channel signaling frame power transmission number of times of specific travelling carriage and the flow chart of transmitting power are pointed in the base station decision.
At first, the base station generates the paging channel signaling frame that points to specific travelling carriage.
The second, to the transmit power initialization of signaling frame, transmitting power is paging channel performance number PCH_GAIN.
The 3rd, calculation base station redundant power RES_PWR carries out different processing according to following criterion then.
1. as RES_PWR＜PCH_Allowed_Limit, do not carry out power back-off.
2. as RES_PWR 〉=PCH_Allowed_Limit, carry out following processing:
A) enter the signaling frame power compensator, according to moving table measuring to pilot signal strength Ec/Io value signaling frame power is compensated.
According to the pilot signal strength relation of being inversely proportional to of base station calling channel emission power and travelling carriage reception, the signaling frame compensation power that points to specific travelling carriage on the paging channel is PCH_SIG_DELTA_GAIN=T_INTF_PCH-Ec/Io (dB).
The signaling frame transmitting power that obtains pointing to specific travelling carriage after the compensation is PCH_SIG_GAIN=PCH_GAIN+PCH_SIG_DELTA_GAIN (dB).
B) enter signaling frame power limiting device, signaling frame power is carried out amplitude limit.Excessive for the required transmitting power of specific travelling carriage that prevents relatively poor wireless environment of living in, during the decision transmitting power, need by paging channel power limiting device PCH_MAX_GAIN.
3. determine on paging channel to send continuously the signaling frame that points to specific travelling carriage for 3 times.
At last, the base station sends signaling message to travelling carriage after determining the signaling frame transmitting power and send number of times continuously according to top several steps.
Following derivation relation is arranged between the pilot tone Ec/Io intensity that travelling carriage receives among Fig. 2 and the paging channel performance number of base station sets.
The pilot signal strength that receives at the travelling carriage place is that Ec/Io equals the pilot power R_pilot that travelling carriage receives and the ratio of interference.Wherein disturb and comprise internal interference (containing thermal noise) I_in and external disturbance (containing thermal noise) I_out.
The energy of every bit and the ratio of noise power spectral density (Eb/Nt) p equal loop power R_page and the noise power spectral density Nt that travelling carriage receives.Wherein noise power spectral density Nt comprises thermal noise density No and interference density Io.Must satisfy quality requirement under the specific environment for the travelling carriage receiving terminal, it is 7 to 9dB that paging channel requires the scope of quality (Eb/Nt) p, except that thermal noise, generally do not comprise other noises for forward link, the therefore approximate energy of every bit and the ratio of thermal noise density (Eb/No) p of being equal to.
Measure at same acceptance point, the interference of pilot tone and paging channel is basic identical, and path attenuation is basic identical.Therefore base station loop power T_page and the ratio of base station pilot power T_pilot and the loop power that the receiving terminal travelling carriage receives are that R_page and pilot power R_pilot are basic identical.According to paging channel gain (W/R
b), with (2) formula substitution (1) formula, can obtain the relation of (3) formula pilot tone and paging channel.
Convert (3) formula to (4) formula, obtain the relation between the paging channel performance number of pilot signal strength Ec/Io that travelling carriage receives and base station sets.Under the situation that travelling carriage paging channel quality value, base station pilot channels performance number and paging channel gain are determined, the pilot signal strength that base station calling channel transmitting power T_page and travelling carriage place receive is that Ec/Io is inversely proportional to.Therefore, can compensate the travelling carriage paging channel quality decline that causes because of factors such as fading channel or strong jammings by increasing the base station calling channel transmitting power.
Paging channel power P CH_GAIN's is characterized as when travelling carriage is in sub-district covering borderline region in (4) formula the BTS service channel transmitting power T_page that needs among Fig. 2.Wherein pilot signal strength Ec/Io scope is-11 to 15dB, forward traffic channel receiving quality (Eb/Nt)
tScope is 7 to 9dB, and it is 15 to 20% that the emission pilot power accounts for the total base station power scope.Consider in the sub-district that except that zones such as indivedual shades, strong jamming and border need compensate, other zones were all in above-mentioned reference range.Therefore the transmitted power of paging channel only compensates being in the specific travelling carriage signaling frame of sensing that Ec/Io such as shade, strong jamming and border are lower than T_INTF_PCH, avoids the system performance degradation that causes because of frequent adjustment.
The effect of signaling frame power compensator is when sending the signaling frame that points to specific travelling carriage among Fig. 2, and pilot signal strength Ec/Io is compensated less than the paging channel of power back-off thresholding T_INTF_PCH.The compensation that signaling frame obtains equals the difference of power back-off thresholding and Ec/Io.The scope of T_INTF_PCH is-8 to-16dB.
The effect of signaling frame power limiting device is to set the signaling frame maximum power PCH_MAX_GAIN that points to specific travelling carriage among Fig. 2.The scope of PCH_MAX_GAIN is-1 to-10dB.
The difference that is characterized as base station maximum transmission power and current transmit power of base station redundant power RES_PWR accounts for the ratio of base station maximum transmission power among Fig. 2.
Paging channel redundant power thresholding PCH_Allowed_Limit's is characterized as the redundant power thresholding that can be used for compensating the paging channel signaling frame among Fig. 2.The scope of PCH_Allowed_Limit is 0 to 100%.
Fig. 3 is the flow chart that the forward traffic channel initial service frame transmitting power of specific travelling carriage is pointed in the base station decision.
At first, the foundation of forward traffic channel is finished in the base station, is ready for sending forward direction initial service frame.
The second, to the transmit power initialization of traffic frame, transmitting power is FDCH_INIT_GAIN.
The 3rd, calculation base station redundant power RES_PWR carries out different processing according to following criterion then.
1. as RES_PWR＜FDCH_Allowed_Limit, do not carry out power back-off.
2. as RES_PWR 〉=FDCH_Allowed_Limit, carry out following processing.
A) enter initial service frame power compensator, according to moving table measuring to pilot signal strength Ec/Io value initial service frame power is compensated.
According to the pilot signal strength relation of being inversely proportional to of BTS service channel emission power and travelling carriage reception, the compensation power of Traffic Channel initial service frame is FDCH_DELTA_GAIN=T_INTF_FDCH-Ec/Io (dB).
The transmitting power that obtains forward traffic channel initial service frame after the compensation is FDCH_INIT_ADJ_GAIN=FDCH_INIT_GAIN+FDCH_DELTA_GAIN (dB).
B) enter initial service frame power limiting device, traffic frame power is carried out amplitude limit.Excessive for the required transmitting power of specific travelling carriage that prevents relatively poor wireless environment of living in, during the decision transmitting power, need by forward traffic channel initial service frame power limiting device FDCH_MAX_GAIN.
At last, after forward traffic channel initial service frame transmitting power is determined according to top several steps in the base station, send the initial service frame to travelling carriage.
Between the pilot signal strength Ec/Io that receives according to travelling carriage among Fig. 3 and the paging channel performance number of base station sets following derivation relation is arranged, can obtain the relation between the forward traffic channel initial gain value of the pilot tone Ec/Io intensity of travelling carriage reception and base station sets.
The energy of every bit and the ratio of noise power spectral density (Eb/Nt)
tEqual service power R_traffic and noise power spectral density Nt that travelling carriage receives.Must satisfy quality requirement under the specific environment for the travelling carriage receiving terminal, Traffic Channel requires quality (Eb/Nt)
tScope be 7 to 9dB.
Obtain the relation between the service channel power value of pilot signal strength Ec/Io that travelling carriage receives and base station sets from (6) formula.Under the situation that mobile station service channel quality value, base station pilot channels performance number and Traffic Channel gain are determined, the pilot signal strength Ec/Io that BTS service channel transmitting power T_traffic and travelling carriage place receive is inversely proportional to, and can compensate the mobile station service channel quality that causes because of fading channel or strong jamming and descends by increasing the BTS service channel transmitting power.
Forward traffic channel initial service frame power FDCH_INIT_GAIN's is characterized as when travelling carriage is in sub-district covering borderline region in (6) formula the BTS service channel transmitting power T_traffic that needs among Fig. 3.Wherein pilot signal strength Ec/Io scope is-11 to 15dB, forward traffic channel receiving quality (Eb/Nt)
tScope is 7 to 9dB, and it is 15 to 20% that the emission pilot power accounts for the total base station power scope.
The effect of initial service frame power compensator is when sending the initial service frame that points to specific travelling carriage among Fig. 3, and pilot signal strength Ec/Io is compensated less than the forward traffic channel of power back-off thresholding T_INTF_FDCH.The compensation that the initial service frame obtains equals the difference of power back-off thresholding and Ec/Io.The scope of T_INTF_FDCH is-8 to-16dB.
The effect of initial service frame power limiting device is to set the initial service frame maximum power FDCH_MAX_GAIN that points to specific travelling carriage among Fig. 3.The scope of FDCH_MAX_GAIN is-1 to-10dB.
The difference that is characterized as base station maximum transmission power MAX_PWR and current transmit power CUR_PWR of base station redundant power RES_PWR accounts for the ratio of base station maximum transmission power among Fig. 3.
Forward traffic channel redundant power thresholding FDCH_Allowed_Limit's is characterized as the redundant power thresholding that can be used for compensating forward traffic channel initial service frame among Fig. 3.The scope of FDCH_Allowed_Limit is 0 to 100%.
Fig. 4 is the wireless signal of base station according to reception, adjusts the transmitting apparatus figure of signaling frame and initial service frame.
The base station radio signal receiver is according to Fig. 1 flow process among Fig. 4, judges to enter signaling frame and initial service frame transmitting apparatus.And, export by signal output apparatus with the signal of demodulation.
The base station radio apparatus for transmitting signal is according to Fig. 2, Fig. 3 flow process among Fig. 4, through signaling frame power compensator, signaling frame power limiting device, with initial service frame power compensator, initial service frame power limiting device, adjust signaling frame and initial service frame power, send the signal of the signal input device input after modulating.
The effect of signaling frame power compensator is when sending the signaling frame that points to specific travelling carriage among Fig. 4, and pilot signal strength Ec/Io is compensated less than the paging channel of power back-off thresholding T_INTF_PCH.The compensation that signaling frame obtains equals the difference of power back-off thresholding and Ec/Io.The scope of T_INTF_PCH is-8 to-16dB.
The effect of signaling frame power limiting device is to set the signaling frame maximum power PCH_MAX_GAIN that points to specific travelling carriage among Fig. 4.The scope of PCH_MAX_GAIN is-1 to-10dB.
The effect of initial service frame power compensator is when sending the initial service frame that points to specific travelling carriage among Fig. 4, and pilot signal strength Ec/Io is compensated less than the forward traffic channel of power back-off thresholding T_INTF_FDCH.The compensation that the initial service frame obtains equals the difference of power back-off thresholding and Ec/Io.The scope of T_INTF_FDCH is-8 to-16dB.
The effect of initial service frame power limiting device is to set the initial service frame maximum power FDCH_MAX_GAIN that points to specific travelling carriage among Fig. 4.The scope of FDCH_MAX_GAIN is-1 to-10dB.
Though describe specific embodiment of the present invention with reference to accompanying drawing in detail with exemplary forms, the present invention can carry out various modifications and distortion.Especially to those skilled in the art, the raising call completing rate that proposes according to the present invention is carried out the method for power back-off to the base station transmit frame, can propose to solve the die down scheme of the call completing rate failure that causes of forward link fully.Should be understood that the present invention falls into covering all modifications in the spirit and scope of the invention that is limited by appended claims,, equivalence is replaced and distortion.
Claims (8)
1. improve the method for call completing rate in the CDMA mobile communication systems, it is characterized in that: when the forward direction weak link, the send mode of in time adjusting signaling frame and initial service frame is adopted in the base station;
Described forward link dies down, and comprises following several determining step:
(1.1) at the call setup initial stage, the base station receives the access channel signaling message of the pilot signal strength that comprises the travelling carriage present position;
(1.2) the forward link situation of change that travelling carriage receives is judged according to the pilot signal strength of travelling carriage report in the base station:
(1.2.1) according to receiving terminal paging channel quality requirements, enter the judgement of paging channel link-quality;
(1.2.2) according to receiving terminal forward traffic channel quality requirements, enter the judgement of forward traffic channel link-quality;
The send mode of in time adjusting signaling frame and initial service frame is adopted in described base station, comprises following several steps:
(1.3) transmitting power and the transmission number of times of the signaling frame of the specific travelling carriage of sensing on the paging channel are adjusted;
(1.4) transmitting power of initial service frame on the forward traffic channel is adjusted.
2. improve the method for call completing rate in a kind of CDMA mobile communication systems according to claim 1, it is characterized in that: described according to receiving terminal paging channel quality requirements, enter the judgement of paging channel link-quality, comprise following several steps:
(2.1), the transmitting power and the transmission number of times of the signaling frame of the specific travelling carriage of sensing on the paging channel are not adjusted when pilot signal strength 〉=paging channel power back-off thresholding;
(2.2) when pilot signal strength＜paging channel power back-off thresholding, to the transmitting power of the signaling frame that points to specific travelling carriage on the paging channel with send number of times and adjust.
3. improve the method for call completing rate in a kind of CDMA mobile communication systems according to claim 1, it is characterized in that: described according to receiving terminal forward traffic channel quality requirements, enter the judgement of forward traffic channel link-quality, comprise following several steps:
(3.1) when pilot signal strength 〉=forward traffic channel power back-off thresholding, the transmitting power of initial service frame on the forward traffic channel is not adjusted;
(3.2) when pilot signal strength＜forward traffic channel power back-off thresholding, the transmitting power of initial service frame on the forward traffic channel is adjusted.
4. improve the method for call completing rate in a kind of CDMA mobile communication systems according to claim 2, it is characterized in that: described transmitting power and transmission number of times to the signaling frame of the specific travelling carriage of sensing on the paging channel adjusted, and comprises following several steps:
(4.1) base station generates the paging channel signaling frame that points to specific travelling carriage;
(4.2) to the transmit power initialization of signaling frame, transmitting power is the paging channel performance number;
(4.3) calculation base station redundant power, carry out different processing according to following criterion then:
(4.3.1), do not carry out power back-off when base station redundant power＜paging channel redundant power thresholding;
(4.3.2), carry out following processing when base station redundant power 〉=paging channel redundant power thresholding:
(4.3.2.1) enter the signaling frame power compensator, according to moving table measuring to pilot signal strength signaling frame power is compensated, compensation power is to point to specific travelling carriage signaling frame compensation power=paging channel power back-off thresholding-pilot signal strength on the paging channel;
(4.3.2.2) enter signaling frame power limiting device, signaling frame power is carried out amplitude limit, the signaling frame maximum power is a paging channel signaling frame maximum transmission power;
(4.3.3) determine on paging channel to send continuously the signaling frame that points to specific travelling carriage for 3 times;
(4.4) after the base station is determined the signaling frame transmitting power and sent number of times continuously according to 4.3 top each step, send signaling message to travelling carriage.
5. improve the method for call completing rate in a kind of CDMA mobile communication systems according to claim 3, it is characterized in that: described transmitting power to initial service frame on the forward traffic channel is adjusted, and comprises following several steps:
(5.1) foundation of forward traffic channel is finished in the base station, is ready for sending forward direction initial service frame;
(5.2) to the transmit power initialization of traffic frame, transmitting power is the forward traffic channel Initial Trans;
(5.3) calculation base station redundant power, carry out different processing according to following criterion then:
(5.3.1), do not carry out power back-off when base station redundant power＜forward traffic channel redundant power thresholding;
(5.3.2), carry out following processing when base station redundant power 〉=forward traffic channel redundant power thresholding:
(5.3.2.1) enter initial service frame power compensator, according to moving table measuring to pilot signal strength Ec/Io initial service frame power is compensated, compensation power is forward traffic channel initial service frame compensation power=forward traffic channel power back-off thresholding-pilot signal strength (dB).
(5.3.2.2) enter forward traffic channel initial service frame power limiting device, traffic frame power is carried out amplitude limit;
(5.4) after forward traffic channel initial service frame transmitting power is determined according to 5.3 top each step in the base station, send the initial service frame to travelling carriage.
6. improve the method for call completing rate in a kind of CDMA mobile communication systems according to claim 4, it is characterized in that: wherein said paging channel redundant power thresholding be characterized as the redundant power thresholding that can be used for compensating the paging channel signaling frame, the scope of paging channel redundant power thresholding is 0 to 100%.
7. improve the method for call completing rate in a kind of CDMA mobile communication systems according to claim 5, it is characterized in that: wherein said forward traffic channel redundant power thresholding be characterized as the redundant power thresholding that can be used for compensating forward traffic channel initial service frame, the scope of forward traffic channel redundant power thresholding is 0 to 100%.
8. improve the equipment of call completing rate in the CDMA mobile communication systems, it is characterized in that: when the forward direction weak link, the transmitting apparatus of in time adjusting signaling frame and initial service frame is adopted in the base station, comprising:
(8.1) signaling frame power compensator: when sending the signaling frame that points to specific travelling carriage, the paging channel of pilot signal strength less than paging channel power back-off thresholding compensated, the compensation that signaling frame obtains equals the difference of power back-off thresholding and pilot signal strength, and the scope of paging channel power back-off thresholding is-8 to-16dB;
(8.2) signaling frame power limiting device: set to point to the signaling frame maximum power paging channel signaling frame maximum transmission power of specific travelling carriage, the scope of paging channel signaling frame maximum transmission power be-1 to arrive-10dB;
(8.3) initial service frame power compensator: when sending the initial service frame that points to specific travelling carriage, the forward traffic channel of pilot signal strength less than forward traffic channel power back-off thresholding compensated, the compensation that the initial service frame obtains equals the difference of power back-off thresholding and pilot signal strength, and the scope of forward traffic channel power back-off thresholding is-8 to-16dB;
(8.4) initial service frame power limiting device: set to point to the forward traffic channel initial service frame maximum transmission power of specific travelling carriage, the scope of forward traffic channel initial service frame maximum transmission power be-1 to arrive-10dB.
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| CN102082601B (en) * | 2009-11-30 | 2014-05-07 | 中国移动通信集团北京有限公司 | Method and device for processing uplink pilot channel interference |
| CN102123434B (en) * | 2010-01-08 | 2015-10-21 | 中兴通讯股份有限公司 | A kind of processing method of base station scheduling and system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07273722A (en) * | 1994-04-01 | 1995-10-20 | Oki Electric Ind Co Ltd | Power controller |
| JPH09214467A (en) * | 1995-11-21 | 1997-08-15 | Lucent Technol Inc | Base station and subscriber station used for code division multiple address radio local loop system |
| US5764630A (en) * | 1996-03-25 | 1998-06-09 | Stanford Telecommunications, Inc. | Forward link carrier recovery in an OCDMA spread spectrum communication system without a pilot tone |
| WO1999013675A1 (en) * | 1997-09-08 | 1999-03-18 | Qualcomm Incorporated | Method and system for changing forward traffic channel power allocation during soft handoff |
| CN1236278A (en) * | 1998-03-06 | 1999-11-24 | 日本电气株式会社 | CDMA mobile telecommunication method and system |
| EP1033038A1 (en) * | 1998-08-04 | 2000-09-06 | Samsung Electronics Co., Ltd. | Channel communication apparatus and method in cdma communication system |
| CN1281323A (en) * | 1999-07-16 | 2001-01-24 | 深圳市华为技术有限公司 | Method and device for controlling transmitting power of base station in CDMA system |
-
2005
- 2005-05-10 CN CNB2005100257257A patent/CN100393171C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07273722A (en) * | 1994-04-01 | 1995-10-20 | Oki Electric Ind Co Ltd | Power controller |
| JPH09214467A (en) * | 1995-11-21 | 1997-08-15 | Lucent Technol Inc | Base station and subscriber station used for code division multiple address radio local loop system |
| US5764630A (en) * | 1996-03-25 | 1998-06-09 | Stanford Telecommunications, Inc. | Forward link carrier recovery in an OCDMA spread spectrum communication system without a pilot tone |
| WO1999013675A1 (en) * | 1997-09-08 | 1999-03-18 | Qualcomm Incorporated | Method and system for changing forward traffic channel power allocation during soft handoff |
| CN1236278A (en) * | 1998-03-06 | 1999-11-24 | 日本电气株式会社 | CDMA mobile telecommunication method and system |
| EP1033038A1 (en) * | 1998-08-04 | 2000-09-06 | Samsung Electronics Co., Ltd. | Channel communication apparatus and method in cdma communication system |
| CN1281323A (en) * | 1999-07-16 | 2001-01-24 | 深圳市华为技术有限公司 | Method and device for controlling transmitting power of base station in CDMA system |
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