CN100353811C - Up compression mode selecting method for broadband CDMA mobile communication system - Google Patents
Up compression mode selecting method for broadband CDMA mobile communication system Download PDFInfo
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Abstract
The present invention relates to an optimization method for the down compression mode method of a wideband code division multiple access (WCDMA) communication system. The selection method of the compression mode of a down link arranges service classes of user terminals according to different service classes of the user terminals or the requirements of the different service classes of the user terminals; simultaneously, threshold values of the different service classes are arranged according to the loading condition of a network; when the load is high, small quantity of users with highest levels use the compression mode method of spreading factor halving; when the load is low, most users are allowed to use the compression mode method of spreading factor halving; therefore, network resources are reasonably allocated, difference treatment to different users is realized, and simultaneously, the normal operation and the stable operation of the overall system are guaranteed.
Description
Technical field
The present invention relates to the method for optimizing of Wideband Code Division Multiple Access (WCDMA) (WCDMA) communication system down link compact model mode.
Background technology
In the existing cell mobile communication systems,, reduce interference to system in order to improve the utilance of frequency spectrum resource, the capacity of raising system, the radio-frequency power of base station is limited within certain scope in the system, has both satisfied the covering needs to this sub-district, has reduced the interference to other sub-districts again.When travelling carriage leaves a sub-district, enter the another one sub-district, the signal of the original sub-district that this travelling carriage is received must be more and more a little less than, when signal quality is reduced to certain thresholding, whether increase the communication quality that power all can't satisfy link this moment.For the quality that keeps communicating by letter, do not interrupt simultaneously current ongoing communicating to connect again, continuing of this travelling carriage must be switched to by original base station that other signal is strong, the higher base station of communication quality, the notion of switching in Here it is the cell mobile communication systems.
Switch and be divided into direct-cut operation and soft handover.That is carried out between different system or different frequency switches to direct-cut operation.In the WCDMA system,, need to measure the information of alien frequencies or different system cell in order to finish direct-cut operation.Because user terminal (UE) generally all adopts single-receiver in the WCDMA mobile communication system, like this in order to finish measurement to alien frequencies, and don't interrupt current connection, this just requires down link must take compact model, and the UE of single-receiver utilizes the transmission intercal time slot in the condensed frame to carry out measurement to alien frequencies.
Downlink compression mode is exactly to utilize various technology to vacate the frame structure type of certain transfer of data time slot in the Frame of interface aloft in normal transmission frame.The time slot of vacating is called as transmission intercal, and in this section transmission intercal, the base station does not send any data, and travelling carriage does not receive this physical channel yet.Like this, travelling carriage just can utilize this transmission intercal, and its radio-frequency transmitter is transformed into the alien frequencies target frequency of need measuring, and finishes the various measurements to alien frequencies, so that to the signal(l)ing condition of network-reporting target frequency, assisted network is made correct switch decision.
Under the mode of compact model, be used for carrying out measurement owing to need reserve certain transmission intercal to alien frequencies in normal frame the inside, this has shortened transmission time slot length relatively, people have expected improving the transmitted bit speed of transmission time slot very naturally, so just can transmit the data bit identical, and not reduce the bit rate of entire frame in the condensed frame the inside of compact model with normal frame.The compact model that this also is the earliest to be adopted, the i.e. compression method that reduces by half of spreading factor.
It is the downlink compression mode that a kind of ratio is easier to realize that spreading factor reduces by half, and it is constant to have transmission rate simultaneously, and the service quality (Qos) of telex network service can be protected substantially, the advantage that does not need the upper strata to participate in.
In the compact model that adopts spreading factor to reduce by half,, need to improve the bit rate of transmission time slot in order to compensate the influence of transmission intercal.For the information that guarantees to send can correctly be received, when carrying out compressed mode transmission, down link signal is being carried out in the exterior ring power control procedure, correspondingly need to increase signal-to-jamming ratio (SIR) desired value of compact model down link signal.According to the regulation of 3GPP agreement, under compact model, down link signal sir target value has increased by one times than normal mode at least, and this causes that correspondingly descending power increases pro rata.And increasing substantially of downlink signal transmissions power causes the increase of cell load, increased the interference to the sub-district.
Except above shortcoming, when adopting the spreading factor halving method to realize compact model, when if father's sign indicating number of the spreading code of current use can use, spreading code during then using father's sign indicating number as compact model is if father's sign indicating number of spreading code can use other bell idles that have same levels with father's sign indicating number in the time of can not using.Like this, all subcodes of this yard can not be assigned to other UE uses.The spreading factor that in the sub-district, connects UE user hour, the drawback that adopts this mode to bring is to cause that easily the receivability number of users reduces in a large number in the sub-district, causes the significant wastage of yard resource, the user inserts success rate in the sub-district thereby may reduce.
When the sub-district does not have spread spectrum code resources to utilize, then need to use the replacement scrambler, can realize the corresponding one by one of spreading code in the sub-district and replacement scrambler by mapping, but because the orthogonality of replacing between scrambler and other scramblers is relatively poor, when using the number of users of replacing scrambler to increase in the sub-district, can increase the phase mutual interference between the user, influence the performance of system.
Simultaneously, when the user determined to need to start compact model, the user was positioned at cell edge under the situation mostly.At this moment, downlink signal transmissions power is relatively all than higher.If it is more to connect number of users in the sub-district, have relatively when all needing to start compression than the multi-user, down load will become very big this moment, if under the situation that a large number of users employing spreading factor reduces by half, the height that transmitting power will become suitable, disturb aggravation, be easy to cause load congested, the rapid decline of systematic function.
In addition, when spreading factor equaled 4, this was the employed minimum spread spectrum coefficient of WCDMA system down link, and do not have littler spreading factor to use this moment, and the compact model that can not adopt spreading factor to reduce by half.
In order to remedy the reduce by half deficiency of compact model mode of spreading factor, produced the compression method of high-level scheduling and punching in succession.The method of high-level scheduling is exactly to limit by the speed and the packed format of upper strata to transmission channel, in compact model, only to use the subclass of the TFCS (transport format combination set) that is allowed, reduce the high-rise data traffic that transfers to physical layer, finally form the compact model frame format in physical layer by the rate-matched of bottom and the insertion of discontinuous emission indication bit.Its advantage is during compact model, does not need to increase transmitting power, does not need to take a yard resource, and is simple to operate.
During the compact model of high-level scheduling, its shortcoming were compact model, transmitted data rates reduced; Need upper strata control, increased the upper strata expense; Be cost with the data field in down link, enlarged transformat combination sign (TFCI) territory, the TFCI territory has expanded to data field; When transmission channel in the radio frames has fixing starting position, then can not use the compact model of upper strata scheduling; And when in the transport format combination set during not than the transport format combination subset of low rate, this method is also unavailable.
The compact model of punching is exactly to obtain transmission intercal by the code efficiency that improves transmission channel, promptly when adopting convolution code or Turbo code, can utilize the redundancy of coding, by interweave and rate-matched certain redundant bit is combined the deletion of punching, formation transmission intercal.During its advantage is compact model, do not reduce signal rate, do not take a yard resource, need not high-risely participate in.
But when adopting the mode of punching, because the reduction of code correction performance, the decline of coding gain, when under carrying out compact model down link signal being carried out exterior ring power control, the sir target value that still needs to improve down link signal compensates.According to the regulation of 3GPP agreement, than the downlink compression mode that spreading factor reduces by half, under the punching downlink compression mode, the increment of sir target value is low a lot, and its power increase is also corresponding have been reduced a lot.But when the punching ratio is too high, can cause transmission error code to increase, the downlink communication link-quality is descended, service quality (Qos) can not get guaranteeing.
The compression mode selecting method of prior art in the selection of decision downlink compression mode mode, mostly is the compression method that at first adopts spreading factor to reduce by half, and next adopts the method for high-level scheduling, adopts the compression method of punching at last.Be " method for optimizing of the downlink compression mode mode of code division multiple address communication system " in denomination of invention, be numbered the compression mode selecting method that discloses above-mentioned prior art in the Chinese patent literature of CN1371191A.
In the WCDMA system, not only exist traditional voice service, data, services more has stylish Video service, game services, Internet service or the like a large amount of abundant class of service and various value-added services.These different classs of service obviously have different service quality (QoS) requirement, the requirement with different transmission data bit rates.As speech and video traffic to the requirement of transmission rate, time delay and QoS apparently higher than professional requirements such as data.It but is not very sensitive that business such as internet and transfer of data changes transmitted data rates.Recreation waits other various novel business that service quality and transmission rate variation are had different reactions.
When these users with different business classification carry out the selection of downlink compression mode mode, if above-mentioned art methods is selected compact model, the method that the user will select spreading factor to reduce by half according to the sequencing that starts compact model successively, the method for high-level scheduling, the method for punching.Such selecting sequence makes communication system very likely can allow those to transmission rate, and the user of the class of service that quality of service requirement is not high adopts transmitted bit speed constant, the downlink compression mode that the higher relatively spreading factor of service quality reduces by half; And those are to transmission rate, the user of the class of service that quality of service requirement is very high is because the restriction of system load, but can only adopt the downlink compression mode of the relatively low punching of high-level scheduling that transmitted data rates reduced or service quality, user's transmission rate and service quality are not guaranteed on the contrary like this.
The consequence that the downlink compression mode of above-mentioned prior art is selected to be caused is the unreasonable of resource allocation, and customers' satisfaction level descends, and the rate of complaints rises, and WCDMA system service quality evaluation is descended.Simultaneously, owing to might produce different service class requirements in the future between service provider and the user, some users prefer to pay the more service expense than domestic consumer, to obtain higher telecommunication service quality.The compact model mode system of selection of above-mentioned prior art then is unfavorable for the doscrimination of different user service class.Therefore, need a kind of improved compression mode selecting method, to overcome these defectives.
Summary of the invention
Purpose of the present invention just provides the system of selection of downlink compressed mode in a kind of WCDMA mobile communication system, and this method remedies the deficiency of existing downlink compression mode system of selection.The system of selection of a kind of WCDMA CDMA mobile communication systems downlink compressed mode of the present invention at first according to the different business classification of UE, perhaps according to the different service class requirements of UE, is provided with the service class of UE; According to offered load service class threshold value G is set then
THBy judging whether whether the UE service class be fit to the downlink compression mode that the employing spreading factor reduces by half greater than the service door limit value with preliminary this user of determining; Whether judge spreading factor greater than set point, further determine the method whether this user can adopt spreading factor to reduce by half.Like this for those to transmission rate, the user that quality of service requirement is higher, the downlink compression mode that then allows them preferentially take spreading factor to reduce by half, thereby guarantee their quality of service requirement; Simultaneously according to network load condition, different service class threshold values is set, when load is higher, the compact model that then allows a small amount of highest-ranking user adopt spreading factor to reduce by half, when load is lower, the compact model that then allows most of user to adopt spreading factor to reduce by half.Like this, by distributing different downlink compression modes to different user, reasonable distribution Internet resources, realized doscrimination to different user, guaranteed the normal operation and the stable operation of whole system simultaneously again.
The system of selection of a kind of WCDMA mobile communication system downlink compressed mode of the present invention comprises step:
(1) universal mobile telecommunications system land radio access web (UTRAN) starts downlink compression mode according to the measurement requirement needs;
(2) according to subscriber service class etc. user terminal (UE) service class is set;
(3) according to system load service class threshold value G is set
TH
(4) judge that whether the UE service class is greater than threshold value G
TH,, otherwise carry out step (7) if then carry out step (5);
(5) whether further judge spreading factor greater than set point,, otherwise carry out step (7) if then carry out step (6);
(6) downlink compression mode that spreading factor reduces by half is adopted in decision, carry out step 11;
(7) judge whether transmission channel (Trch) has fixing starting position in the code combination transmission channel (CCTrCH), is then to carry out step (10), otherwise carries out step (8);
(8) judge that whether transport format combination set (TFCS) has transformat combination (TFC) subclass than low transmission rate, is then to carry out step (9), otherwise carries out step (10);
(9) the decision downlink compression mode adopts the compact model of high-level scheduling, carry out step 11;
(10) the decision downlink compression mode adopts the downlink compression mode of punching, carry out step 11;
(11) output downlink compression mode selection result.
Above-mentioned downlink compressed mode system of selection of the present invention, it is characterized in that: described subscriber service class comprises voice service, data, services, Video service, Internet service, game services or the like.
The downlink compression mode mode that adopts above technical scheme to carry out is selected to have the following advantages: one) provide a kind of optionally according to subscriber service class, for example voice, video, data, Internet service or the like, perhaps user and the different service class that the service provider consults carry out other user of different priorities is carried out the different differentiated services of service quality.Have other user of higher priority for those, at first guarantee their service quality and transmission rate request.According to grid situation and load state, have the number of users of the adjustable certain service quality of assurance, when offered load is big, guarantee the service quality of the small number of users that priority is higher; When offered load hour, guarantee more quality of services for users.If with G
THBe set to 0, then can cancel doscrimination different user.Two) according to community user quantity and sign indicating number resource rational spreading factor thresholding SF is set
TH, not only guaranteed can not cause the huge waste of yard resource, cause that community user inserts a large amount of minimizings of quantity; Also can not produce simultaneously the deficiency of spread spectrum code resources, the increase of avoiding a large number of users to adopt scrambler to cause to area interference.Three), rational service class G is set according to the situation of cell load
THThreshold value under the situation that load allows, guarantees certain quality of services for users and transmission rate request like this; If cause the rapid increase of load, might take place then to refuse the downlink compression mode that this user takes spreading factor to reduce by half under the congested situation, can guarantee the normal operation of whole system like this.Four) according to comprehensive conditions such as subscriber service class and system loads, need carry out the user of downlink compression mode to those, when the decision downlink compression mode, can guarantee disposable selection success, avoid repeating selecting, accelerated response time, guaranteed carrying out smoothly of direct-cut operation this user.
Description of drawings
Fig. 1 is a WCDMA mobile communication system downlink compressed mode system of selection step schematic diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with Fig. 1.Among Fig. 1,
Step 1: according to the needs that different-frequency measure requires, universal mobile telecommunications system land radio access web (UTRAN) needs to start downlink compression mode.
Step 2: according to the different business classification of UE, the perhaps different service class requirements of UE are provided with the service class of UE.In general, the user that those are high to quality of service requirement, perhaps to the relatively more fixing user of transmission rate request, as speech, real time business such as video are set at has higher service class; And those are insensitive to the transmission rate variation, it is lower service class that service quality changes the higher traffic set of holding capacity; The also SLA that can may sign in the future according to service provider and user is set at different user and has different Priority Service ranks.Other user of different priorities has different service quality difference.
Step 3: service class threshold value G is set according to offered load
THThe definite of threshold value generally rationally is provided with according to cell load.Determining of load size can be based on down transmitting power, also can be based on downlink throughput capacity.If cell load is lower, then threshold value can be got than low value, can allow more user have good quality of service and transmission rate like this.When cell load than higher the time, threshold value is got high value, high quality of services for users and the transmission rate of such those service class of preferential assurance.If with threshold settings is 0, then all users of sub-district have identical priority level.Threshold value G
THAdjustability brought sizable flexibility to system, guaranteed that the user when the downlink compression mode of selecting spreading factor to reduce by half, can not make the load of system excessive, thereby causes the congested of system.
Step 4: judge that whether the UE service class is greater than the service door limit value.Like this for those to transmission rate, the user that quality of service requirement is higher, then preliminary judgement allows the downlink compression mode that they adopt spreading factor to reduce by half; For those to transmission rate, service quality is not very sensitive user, then according to network load condition, when load is higher, then the refusal allow them adopt spreading factor to reduce by half compact model, when load is lower, can tentatively agree the compact model that a part of user adopts spreading factor to reduce by half selectively.
Step 5:, judge that further whether spreading factor is greater than set point SF for those preliminary users who agrees the downlink compression mode that the employing spreading factor reduces by half
THSpreading factor set point SF
THValue generally rationally be provided with according to community user quantity and spread spectrum code resources, if value is too little, then cause the huge waste of yard resource, the rapid minimizing of community user number.If value is too big, can cause the deficiency of spread spectrum code resources again, when adopting scrambler, because the nonorthogonality of scrambler causes the increase of area interference, the decline of systematic function when there not being available spread spectrum code resources.Set point SF
THGenerally get greater than the number more than 4.
Step 6: for the user class of service, spreading factor requires the equal user that can satisfy, then agree the downlink compression mode that this user adopts spreading factor to reduce by half, higher service class quality of services for users and transmission rate request had so both been guaranteed, simultaneously the whole system performance is not produced too much influence again, to the interference of system among the TL of system.
Step 7: can not adopt the reduce by half user of compact model of spreading factor for those, whether the middle transmission channel (Trch) of code combination transmission channel (CCTrCH) of then judging them has fixing starting position, and (Trch) can not have fixing starting position because high-level scheduling necessarily requires transmission channel.
Step 8: do not have the user of the transmission channel of fixing starting position for those, judge further then whether transport format combination set (TFCS) has transformat combination (TFC) subclass than low transmission rate, if the transport format combination subset of not lower transmission rate in the transport format combination set, then this user also can not adopt the compact model of high-level scheduling.
Step 9: for the user who satisfies 2 requirements more than the high-level scheduling compact model, decision allows them adopt the compact model of high-level scheduling.Though the compact model of high-level scheduling has increased high-rise expense, reduced this user's transmission rate, can not increase down transmitting power, reduced interference to the sub-district.
Step 10: can not adopt spreading factor to reduce by half for those, can not adopt the user of the downlink compression mode of high-level scheduling again, final decision allows them adopt the downlink compression mode of punching.Because it is few that the compression of punching increases down transmitting power, little to the area interference influence, still can cause the raising of this telex network link transmission error rate, the decline of communication transmission quality, this is that the last of above two kinds of methods replenished.
Step 11: according to above judgement, final decision output downlink compression mode selection result.
Claims (2)
1. WCDMA mobile communication system downlink compressed mode system of selection comprises step:
Step 1, universal mobile telecommunications system land radio access web (UTRAN) starts downlink compression mode according to the measurement requirement needs;
Step 2 is provided with user terminal (UE) service class according to subscriber service class and service class;
Step 3 is provided with service class threshold value G according to system load
TH:
Step 4 judges that whether user terminal (UE) service class is greater than threshold value G
TH,, otherwise carry out step 7 if then carry out step 5;
Step 5 judges that further whether spreading factor is greater than set point SF
TH,, otherwise carry out step 7 if then carry out step 6;
Step 6, the downlink compression mode that decision adopts spreading factor to reduce by half carry out step 11;
Step 7, judge whether transmission channel (Trch) has fixing starting position in the code combination transmission channel (CCTrCH), is then carry out step 10, otherwise carry out step 8:
Step 8 judges that whether transport format combination set (TFCS) has transformat combination (TFC) subclass than low transmission rate, is then carry out step 9, otherwise carry out step 10;
Step 9, the decision downlink compression mode adopts the compact model of high-level scheduling, carry out step 11;
Step 10, the decision downlink compression mode adopts the downlink compression mode of punching, carry out step 11;
Step 11, output downlink compression mode method selection result.
2. according to the described downlink compressed mode system of selection of claim 1, it is characterized in that: described subscriber service class comprises voice service, data, services, Video service, Internet service, game services.
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| CN101115289B (en) * | 2006-07-28 | 2010-09-01 | 中兴通讯股份有限公司 | Spread-spectrum factor based transmission format combination configuring method |
| CN103139104B (en) | 2011-12-05 | 2017-02-08 | 深圳迈瑞生物医疗电子股份有限公司 | Network transmission service class adjustment method, data terminal and network server |
| CN103516460B (en) * | 2012-06-25 | 2016-08-10 | 京信通信技术(广州)有限公司 | The method for releasing of downlink spreading code and device |
| CN103227819B (en) * | 2013-03-28 | 2016-08-03 | 北京创毅视讯科技有限公司 | The transmission method of business datum and system, base station and UE in machine type communication |
| CN106162258A (en) * | 2016-06-30 | 2016-11-23 | 乐视控股（北京）有限公司 | The control method of a kind of audio video transmission overload and device |
| CN109150400B (en) * | 2018-08-14 | 2021-08-17 | Oppo广东移动通信有限公司 | Data transmission method and device, electronic equipment and computer readable medium |
| CN114257527B (en) * | 2021-11-01 | 2024-02-02 | 北京思特奇信息技术股份有限公司 | Network bearing capacity estimation method |
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Address after: 430205 Hubei city of Wuhan province Jiangxia Hidden Dragon Island Tan lake two Road No. 1 Patentee after: CITIC Mobile Communication Technology Co., Ltd Address before: 430073 Hubei province Wuhan Dongxin East Lake high tech Development Zone, Road No. 5 Patentee before: Wuhan Hongxin Telecommunication Technologies Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee after: CITIC Mobile Communication Technology Co.,Ltd. Address before: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee before: CITIC Mobile Communication Technology Co., Ltd |