CN1761356A - Method for converting types from public channel to dedicated channel in CDMA system - Google Patents
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Abstract
The method includes steps: power on running system, setting up counting threshold value, capacity threshold values of user's receiving buffer and sending buffer, capacity threshold values of receiving buffer and sending buffer of common channel; system builds user service on common channel, control side asks base station to carry out load measurement of sub zone; user side, UE carries out measuring capacity of user's receiving or sending buffer; if capacity of user's receiving or sending buffer is larger than its threshold value, then reporting to control side and starts up the counter plus 1; if accumulated value larger than threshold value of counter, as well as load of sub zone is not over loading, and system can provide suitable resource of sub zone, then carrying out type conversion from common channel to dedicated channel; well considering detailed circumstances of switching channel in CDMA system, the method saves system resource effectively, and raises capacity of system.
Description
Technical field
The present invention relates to a kind of code division multiple access (Code Division Multiple Access, hereinafter to be referred as CDMA) method for converting types of system's different communication interchannel, the common signal channel of sharing at a plurality of users particularly is to the method for converting types of unique user dedicated channel.
Background technology
Development along with mobile communication, increasing business just progressively is applied, not only comprise traditional circuit switching (Circuit Switched, hereinafter to be referred as CS) voice service under the connected mode, also comprise the data service under packet switching (Packet Switched is hereinafter to be referred as the PS) connected mode.Especially Packet data service combines closely with network, offers people and uses very widely: visual telephone, Streaming Media, file download, video request program, receiving and dispatching mail or the like.But the property difference of these packet data application is very big, and except Streaming Medias such as video conference and online request continued transmission, online game, online browse, file download etc. all had the characteristic of burst.The packet burst that sends is spread out, and has the period that does not wherein send grouping, and like this, " density " of grouping is high in the short time interval, but for the long period, usually is exactly low.
Because data service is this sudden, has also taked some measures on the network, the transmission control protocol of often using on for example present network (TCP).From the angle of performance for wireless communications, the feature of TCP maximum is exactly flow control, and it adopts congestion window and supplies with window and realize flow control.The data volume that sends depends on the monitoring to Congestion Level SPCC, if TCP realizes packet loss is arranged, and so just reduces transmission rate, increases at leisure again then and improves throughput gradually.Yet this congested response mechanism can have influence on the throughput of wireless network.
Therefore, mobile communication system must satisfy the miscellaneous service demand from self.But, be again limited with Time Bandwidth, adopt dissimilar wireless channels can effectively utilize bandwidth, and dissimilar service application is provided.
In communication system, two types channel is arranged, a kind of is the dedicated channel corresponding with unique user, another kind is the common signal channel that a plurality of users share.Dedicated Traffic Channel can keep the real-time relation between information entity, and high data throughout is provided.And common signal channel transmits information block with relatively low data throughout.Therefore, when the quality of service of being asked is higher relatively, speech or for example to synchronous communication, soft handover or More Soft Handoff are fit to use dedicated channel to handle; When the quality of service of being asked is relatively low, as Email, short message, or a spot of transfer of data, common signal channel is well suited for handling.In third generation cdma system, the outstanding difference of dedicated channel and common signal channel also be for power resource and the sign indicating number resource use on.Descending, use orthogonal code to distinguish different users, every dedicated channel is used a code word, and capacity is high more, and the code word that needs is also many more; And the grouped data on the common signal channel is only shared a code word.And dedicated channel is used fast closed-loop power to control and is conformed and mobility, guarantees lower bit error rate and communication quality, if transmission rate is high more, the transmitting power that needs is high more; Common signal channel uses not too accurate open Loop Power control, is not suitable for sending lot of data.
Cdma system is a system with soft capacity, descending be the sign indicating number resource-constrained, up be power limited.If can in system's running, the channel type of supporting the user to connect suitably be changed, so just can dynamically change use to resource, improve the capacity of system.
The existing channel switching method that is used for wireless communication system as " based on the common signal channel load, common signal channel is to the type conversion of dedicated channel " (number of patent application: 00816611.0, patent publication No.: 1402946A, open day: on March 12nd, 2003) provide a kind of load or throughput according to detected common signal channel, corresponding data volume thresholding is provided, based on connecting the current data amount of transmission and the comparison of data volume thresholding, determine whether the user is connected the method that switches to dedicated channel from common signal channel by the user.But, this method only consider the load of common signal channel or throughput and with user-dependent data volume, and do not consider the factors such as supply capacity of cell load, resource, and in the CMDA system, when transship the sub-district, it is exactly the throughput that reduces Packet Service that a measure is wherein arranged, but switch to dedicated channel just in order to improve the throughput of Packet Service, have to like this and switch back in the common signal channel, so not only increase signaling consumption repeatedly, but also can cause losing of grouped data easily.In addition, if the spreading factor that system provides (channelization code resource) can not satisfy the requirement with user-dependent data volume transmission rate, even change so, can not alleviate the burden with the transmission buffer area of user's join dependency, the conversion of channel type has also just lost meaning.
Therefore, existing method does not fully take into account the concrete condition that channel switches in the cdma system, judges rightly thereby can't make, and making channel switch back system resource can not reasonably be utilized, even adverse consequencess such as signaling consumption, lost packets data also may appear increasing.
Summary of the invention
Technical problem to be solved by this invention provides the method for converting types of public channel to dedicated channel in a kind of code division multiple access system, this method fully takes into account the concrete condition that channel switches in the cdma system, correctly make and whether carry out the judgement that channel switches, thereby really save system resource effectively, improve the capacity of cdma system.
In order to solve the problems of the technologies described above, the invention provides the method for converting types of public channel to dedicated channel in a kind of code division multiple access system, comprise the steps:
(a) the base station controller system operation that powers on is changed to initial condition with counter, and the counting threshold value of counter, the threshold value that the user received and sent the descending and up buffer area capacity of threshold value, common signal channel of buffer area capacity are set;
(b) base station controller system is accepted user applies, and customer service is based upon on the common signal channel, chain of command sends to base station, UE and user's face and measures control command simultaneously, requiring the base station to carry out cell load measures, and user's face carries out the measurement that the user receives buffer area capacity and common down channel buffer area capacity, and UE carries out the measurement that the user sends buffer area capacity and uplink common channel buffer area capacity;
(c) whether the measurement result in the determining step (b) satisfies report condition, if satisfy condition then reporting measurement result, and execution in step (d), otherwise return step (b); Wherein, described report condition comprises that the user receives or send the capacity of buffer area greater than its corresponding threshold value;
(d) chain of command receives measurement result, and the enabling counting device adds 1, if the aggregate-value of counter is greater than the counting threshold value, and execution in step (e) then, otherwise return step (b);
(e) chain of command judges whether to satisfy the condition of channel type conversion according to the application situation of measurement result that receives and systematic code resource, if satisfy, carry out the type conversion of public channel to dedicated channel, otherwise, do not carry out the type conversion of public channel to dedicated channel, return step (b); Wherein, the condition of channel type conversion comprises that cell load nonoverload and system can provide the proper cell resource.
Further, said method can have following characteristics: also comprise the threshold value that the shake standard is set in the described step (a); Report condition comprises that also the user receives or send the threshold value of the capacity of buffer area less than the shake standard, wherein should shake the standard gate limit value all received and sent the buffer area capacity less than the user threshold value in the step (c).
Further, said method can have following characteristics: described step (d) is further divided into following steps
(d1) judge that the capacity that the user received or sent buffer area is greater than corresponding threshold value, still less than the threshold value of shake standard, if greater than the threshold value of buffer area capacity, then execution in step (d2); If less than the threshold value of shake standard, with counter O reset and return step (b);
(d2) whether the aggregate-value of judging counter greater than the counting threshold value, if greater than, execution in step (e) then, otherwise counter adds 1, returns step (b).
Further, said method can have following characteristics: described step (e) is further divided into following steps
(e1) judge whether cell load transships, if nonoverload, execution in step (e2) then, otherwise return step (b);
(e2) can the judgement system provide available sign indicating number resource, if can, execution in step (e3) then, otherwise return step (b);
(e3) judge transmission rate that system provides available code resource whether greater than the transmission rate of common signal channel, if greater than, execution in step (e5) then, otherwise execution in step (e4);
(e4) the buffer area capacity of judging the common signal channel downlink or uplink has surpassed corresponding threshold value, if surpass, and execution in step (e5) then, otherwise return step (b);
(e5) carry out the type conversion of public channel to dedicated channel.
Further, said method can have following characteristics: described step (b) comprises that also chain of command is provided with the step that reports mode of measurement result, and described step (c) is further divided into following steps:
(c1) if reporting mode is reporting events, then judge by user's face, UE whether measurement result satisfies report condition,, then measurement result is reported to chain of command if satisfy, execution in step (d), otherwise return step (b);
(c2) be periodic report if report mode, then measure to be provided with in the control command and report at interval, base station, user's face, UE are according to reporting gap periods ground to chain of command reporting measurement result, and judge by chain of command whether measurement result satisfies report condition, if satisfy, execution in step (d) then, otherwise return step (b).
Further, said method can have following characteristics: the threshold value of the counting threshold value of setting in the step (a), the threshold value of each buffer area capacity correspondence, shake standard is set by chain of command, can dynamically adjust according to the load of sub-district in system's running.
Further, said method can have following characteristics: the threshold value of the counting threshold value of setting in the step (a), the threshold value of each buffer area capacity correspondence, shake standard can be carried out the corresponding dynamic adjustment according to service traffics amplitude of variation between user and the system.
Further, said method can have following characteristics: report described in the step (c2) at interval and can adjust according to service traffics amplitude of variation between user and the system, when service traffics change greatly, increase to report at interval; Very little when the service traffics variation, then reduce to report at interval.
Compared with prior art, the present invention has the following advantages:
A, this method only consider the load of common signal channel or throughput and with user-dependent data volume, do not consider the factors such as supply capacity of cell load, resource, make and can not save system resource after switching; And this method on the basis of existing technology, fully take into account the factors such as supply capacity of cell load, resource, in conjunction with the ability of common signal channel, the load of sub-district and the judgement whether the resource operating position comprehensively carries out the channel type conversion, can save system resource effectively behind feasible the switching, thereby improve the capacity of cdma system.
B, further, this method logic is reasonable, efficient is high, can in time adjust according to the variation of service traffics, to resource rational utilization, avoids other control method to system simultaneously, as load control, produces negatively influencing.
C, adopt this method also can adapt to the wireless environment of dynamic change according to service traffics amplitude of variation between cell load, user and the system to counting thresholding, threshold value, shake thresholding that each buffer area capacity is corresponding with report at interval and dynamically adjust.
Description of drawings
Fig. 1 is the radio protocol layer structure chart of WCDMA (Wideband Code Division Multiple Access (WCDMA)) system;
Fig. 2 is the main flow chart of the present invention when connection is set up;
Fig. 3 is the sub-process figure of channel type conversion decision algorithm among Fig. 2.
Embodiment
For understanding the method for converting types of public channel to dedicated channel in the code division multiple access system of the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
Shown in Figure 1 is the radio protocol layer structure chart of WCDMA system, and the effect of Radio interface protocols is to set up, reconfigure and the releasing wireless loading business, from bottom to top is called physical layer (layer 1), data link layer (layer 2) and network layer (layer 3) successively.From chain of command, layer 2 comprises two sublayers: medium access control (MAC) protocol layer and Radio Link control (RLC) protocol layer; From user's face, except MAC layer and rlc layer, also have two to depend on professional protocol layer: PDCP (PDCP) and broadcast/group broadcast control protocol (BMC).The Radio Resource control (RRC) that layer 3 comprises belongs to control plane.
Physical layer provides information transfer service by air interface, carry out following function: forward error correction coding and decoding, grand diversity distribution/combination is switched and is carried out error detection, multiplexing and the demultiplexing of transmission channel, transmission channel is to the mapping of physical channel, modulation, demodulation, spread spectrum, despreading, power control, synchronous some other function that waits of frequency and time.
The MAC layer is provided at the unacknowledged transmissions of the Service Data Unit between the reciprocity MAC entity.The MAC layer function is selected suitable transformat for each transmission channel, and this depends on data rate.Processed between a user's data stream and between different user's data flows, the scheduling of control messages, the multiplexing and demultiplexing of more high-rise PDU, and some other function.Particularly, the MAC layer is carried out the reprovision of transformat and radio bearer.
Rlc layer is carried out various functions, comprises RLC establishment of connection, release and maintenance, segmentation, the assembling of PDU (protocol Data Unit), and cascade retransmits, and repeats monitoring, flow control and other function.The buffer that is assigned to the transmission data of user's connection is present in rlc layer.
PDCP only is present in packet switching service, and BMC is used for transmitting the air interface messages that CBC produces.
The control plane of network layer part is made up of radio resource control in UTRAN (conventional wireless communication systems grounding wireless access network network).Rrc layer distributing radio resource and by wave point processing controls order, for example, the control command of RAB, measurement report and type switching command.
The situation that takies that business datum in the example algorithm of the present invention's signal sends buffer area reports the MAC layer by rlc layer, and switch decision and switching command are undertaken by rrc layer, and the execution of professional quantitative statistics, type conversion is undertaken by the MAC layer.
The main flow chart of one embodiment of the present of invention shown in Figure 2 when connection is set up, this embodiment adopts the Event triggered mode, the base station controller system operation that powers on, counter is changed to initial condition, and the counting threshold value of counter, the threshold value that the user received and sent the descending and up buffer area capacity of threshold value, common signal channel of buffer area capacity, the parameters such as threshold value of shake standard are set; Wherein, the setting of shake standard thresholding has this situation of jitter at the data traffic flow measurer, be higher than certain threshold value and not exclusively reasonable because only consider service traffics, so low threshold value of relative set, as detecting the standard that shake takes place service traffics, when service traffics were lower than this threshold value, it was clear 0 to carry out the counter of channel type conversion, can avoid unnecessary conversion like this; In addition, the threshold value of each buffer area can be made as a percentage with respect to total buffer area, also can be set as an absolute door limit value.
And this method can also adopt the periodic report mode, under this mode, be provided with in the measurement control order and report at interval, do not comprise thresholding, base station, UE and user's face are according to reporting gap periods ground to chain of command reporting measurement result, and with threshold value relatively be that chain of command oneself carries out, only just further judgement under satisfying less than the situation of threshold value; Base station, UE, user's face are only measured accordingly; When receiving measurement result, chain of command needs end value and threshold value are relatively got final product, and follow-up step is similar.
Why this method adopts counter, be because the feature of data traffic burst, though traffic carrying capacity is temporary transient less than the threshold value of setting, if after the public channel to dedicated channel conversion, data volume in the buffer area may reduce because of the load of common signal channel, and perhaps the data capacity of this connection sharply reduces.Like this, will connect possibly and switch to common signal channel immediately again, cause a kind of " ping-pong " thus.Because switching, each channel type all can consume the battery of terminal, the signaling consumption that the increase system is extra, and cause losing of grouped data easily, so for fear of this situation, this method has adopted counter, and the buffer memory capacity that at every turn monitors is during greater than threshold value, and counter just adds 1, if detected threshold value takes place that counter is just clear 0 so less than certain threshold value, have only when register surpasses the counting thresholding and just further judge.If the counting threshold setting is low, can increase the frequency of adjustment so, increase the load of system thus; If the height that is provided with, slower to the sudden response of traffic carrying capacity.Therefore counting thresholding can preestablish a value, adjusts accordingly according to the load of system, the factors such as emergency case of traffic carrying capacity.
Predefined counting threshold value in this method, the threshold value of each buffer area capacity correspondence, these all set at chain of command as adjudicating some parameters of using the threshold value of shake standard with reporting the interval, these values are pre-set, the setting of initial value can obtain by the method for statistics, also can pass through some measurements, emulation is obtained, can be dynamic in system's running according to the load of sub-district, service traffics amplitude of variation etc. is dynamically adjusted with reference to factor ground between user and the system, adopt feedback mechanism: when service traffics change greatly, report at interval with regard to corresponding increase so, can the smooth change amplitude; When service traffics change very little, reduce to report at interval with regard to corresponding so, so that can tell variation tendency.
The sub-process figure of channel type conversion decision algorithm among Fig. 2 shown in Figure 3 is corresponding to the step 206 among Fig. 2.
Step 301, if the capacity that the user receives buffer area receives the threshold value of buffer area capacity greater than the user, or user's capacity of sending buffer area sends the threshold value of buffer area capacity, execution in step 304 greater than the user;
Step 302, if the user receives the threshold value of the capacity of buffer area less than the shake standard, or the user sends the threshold value of the capacity of buffer area less than the shake standard, execution in step 303;
Step 303, counter is clear 0, and process ends;
Whether step 304, the aggregate-value of judging counter greater than the counting threshold value, if greater than, then execution in step 306, otherwise execution in step 305;
Step 305, counter adds 1, and process ends;
Step 306, judge whether cell load transships, if nonoverload, then need the application code resource, application situation according to the sign indicating number resource: resource meets the demands, resource bid to but the effect that produces unlike better now, do not apply for that three kinds of different situations such as resource take different processing modes respectively, execution in step 307, otherwise process ends;
Step 307, can the judgement system provide available channelization code resource, if can, then execution in step 308, otherwise process ends;
Step 308 is judged transmission rate that system provides available code resource whether greater than the transmission rate of common signal channel, if greater than, then execution in step 310, otherwise execution in step 309;
Step 309 judges that the buffer area capacity of common signal channel downlink or uplink has surpassed threshold value, if surpass, and then for the buffer area that prevents common signal channel overflows, execution in step 310, otherwise process ends;
Step 310 is carried out the type conversion of public channel to dedicated channel, and the type conversion is divided into descending and up two kinds, can carry out the type conversion of down channel or up channel according to actual conditions.
The present invention is used for the method that public channel to dedicated channel carries out type conversion in the cdma system running, mainly based on user-dependent reception with send the measurement of the traffic carrying capacity of buffer area, greater than the predetermined threshold value time, whether the load in conjunction with the sub-district satisfies condition, it is the cell load nonoverload, and whether local resource meets the demands, the embodiment that is local resource is descending channelization code resource for WCDMA, for CDMA2000 is Channel Elements, whether the providing capability of resource can by providing suitable speed to judge, the proper cell resource refers to that system can provide the channelization code resource of higher transmission rate, consider that in addition the buffer area that prevents common signal channel overflows, thereby finally make the decision of channel type conversion.After using this method to carry out the channel type switching, can really save system resource effectively, thereby improve the capacity of cdma system.
Claims (9)
1, the method for converting types of public channel to dedicated channel in a kind of code division multiple access system is characterized in that it comprises the steps:
(a) the base station controller system operation that powers on is changed to initial condition with counter, and the counting threshold value of counter, the threshold value that the user received and sent the descending and up buffer area capacity of threshold value, common signal channel of buffer area capacity are set;
(b) base station controller system is accepted user applies, and customer service is based upon on the common signal channel, chain of command sends to base station, UE and user's face and measures control command simultaneously, requiring the base station to carry out cell load measures, and user's face carries out the measurement that the user receives buffer area capacity and common down channel buffer area capacity, and UE carries out the measurement that the user sends buffer area capacity and uplink common channel buffer area capacity;
(c) whether the measurement result in the determining step (b) satisfies report condition, if satisfy condition then reporting measurement result, and execution in step (d), otherwise return step (b); Wherein, described report condition comprises that the user receives or send the capacity of buffer area greater than its corresponding threshold value;
(d) chain of command receives measurement result, and the enabling counting device adds 1, if the aggregate-value of counter is greater than the counting threshold value, and execution in step (e) then, otherwise return step (b);
(e) chain of command judges whether to satisfy the condition of channel type conversion according to the application situation of measurement result that receives and systematic code resource, if satisfy, carry out the type conversion of public channel to dedicated channel, otherwise, do not carry out the type conversion of public channel to dedicated channel, return step (b); Wherein, the condition of channel type conversion comprises that cell load nonoverload and system can provide the proper cell resource.
2, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 1 is characterized in that: also comprise the threshold value that the shake standard is set in the described step (a); Report condition comprises that also the user receives or send the threshold value of the capacity of buffer area less than the shake standard, wherein should shake the standard gate limit value all received or sent the buffer area capacity less than the user threshold value in the step (c).
3, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 2, it is characterized in that: described step (d) is further divided into following steps
(d1) judge that the capacity that the user received or sent buffer area is greater than corresponding threshold value, still less than the threshold value of shake standard, if greater than the threshold value of buffer area capacity, then execution in step (d2); If less than the threshold value of shake standard, with counter O reset and return step (b);
(d2) whether the aggregate-value of judging counter greater than the counting threshold value, if greater than, execution in step (e) then, otherwise counter adds 1, returns step (b).
4, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 3, it is characterized in that: described step (e) is further divided into following steps
(e1) judge whether cell load transships, if nonoverload, execution in step (e2) then, otherwise return step (b);
(e2) can the judgement system provide available sign indicating number resource, if can, execution in step (e3) then, otherwise return step (b);
(e3) judge transmission rate that system provides available code resource whether greater than the transmission rate of common signal channel, if greater than, execution in step (e5) then, otherwise execution in step (e4);
(e4) the buffer area capacity of judging the common signal channel downlink or uplink has surpassed corresponding threshold value, if surpass, and execution in step (e5) then, otherwise return step (b);
(e5) carry out the type conversion of public channel to dedicated channel.
5, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 1 is characterized in that: described step (b) comprises that also chain of command is provided with the step that reports mode of measurement result.
6, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 5, it is characterized in that: described step (c) is further divided into following steps:
(c1) if reporting mode is reporting events, then judge by user's face, UE whether measurement result satisfies report condition,, then measurement result is reported to chain of command if satisfy, execution in step (d), otherwise return step (b);
(c2) be periodic report if report mode, then measure to be provided with in the control command and report at interval, base station, user's face, UE are according to reporting gap periods ground to chain of command reporting measurement result, and judge by chain of command whether measurement result satisfies report condition, if satisfy, execution in step (d) then, otherwise return step (b).
7, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 2, it is characterized in that: the threshold value of the counting threshold value of setting in the step (a), the threshold value of each buffer area capacity correspondence, shake standard is set by chain of command, can dynamically adjust according to the load of sub-district in system's running.
8, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 6 is characterized in that: the threshold value of the counting threshold value of setting in the step (a), the threshold value of each buffer area capacity correspondence, shake standard can be carried out the corresponding dynamic adjustment according to service traffics amplitude of variation between user and the system.
9, the method for converting types of public channel to dedicated channel in the code division multiple access system according to claim 8, it is characterized in that: report described in the step (c2) at interval and can adjust according to service traffics amplitude of variation between user and the system, when service traffics change greatly, increase to report at interval; Very little when the service traffics variation, then reduce to report at interval.
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| JP2003515294A (en) * | 1999-11-17 | 2003-04-22 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Acceleration-dependent channel switching in mobile telecommunications |
| KR100750413B1 (en) * | 1999-12-16 | 2007-08-21 | 지멘스 악티엔게젤샤프트 | Assembly device comprising several transport lines for substrates to be assembled |
| CN100551138C (en) * | 2002-08-16 | 2009-10-14 | 北京三星通信技术研究有限公司 | Be initiated as MBMS by DRNC and set up the method that is connected with the data of core net |
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