CN100433894C - Method of type conversion from dedicated channel to common channel in CDMA system - Google Patents
Method of type conversion from dedicated channel to common channel in CDMA system Download PDFInfo
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- CN100433894C CN100433894C CNB2004100811807A CN200410081180A CN100433894C CN 100433894 C CN100433894 C CN 100433894C CN B2004100811807 A CNB2004100811807 A CN B2004100811807A CN 200410081180 A CN200410081180 A CN 200410081180A CN 100433894 C CN100433894 C CN 100433894C
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Abstract
The present invention discloses a method of type conversion from dedicated channels to common channels in CDMA systems, which comprises the following steps that a system is switched on for operation; a count threshold value of a counter and a capacity threshold value of a sending buffer memory area of a dedicated channel are arranged; the system accepts the application of a user and distributes the dedicated channel; simultaneously, control a measurement control instruction which faces a user surface is controlled and sent; the capacity of the sending buffer memory area of the dedicated channel relevant to user connection is requested for measurement; if the capacity of the sending buffer memory area of the dedicated channel is smaller than the set corresponding threshold value, physical quantity relevant to a user device is measured and all measurement results are reported to a leadership; a control surface is used for receiving a reporting result and starting the counter to be added by one; if the accumulating value of the counter is larger than the count threshold value, the user device is judged whether or not the user device is not in a macro diversity state; if a condition is satisfied, type conversion from the dedicated channel to a common channel is carried out; otherwise, switch is not carried out. The present invention, which is completely suitable for CDMA systems, can effectively save systemic resource and enhances systemic capacity.
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 particularly method for converting types of the common signal channel of sharing to a plurality of users at the dedicated channel of unique user.
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.From the angle of performance for wireless communications, the feature of transmission control protocol 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 transmission control protocol is realized 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 of wireless communication system that is used for is as " switching based on common signal channel type load, from the dedicated channel to the common signal channel " (number of patent application: 00817331.1, patent publication No.: 1411666A, open day: on April 16th, 2003) provide between the capacity that a kind of dedicated channel based on user's join dependency sends buffer area and the throughput that common signal channel can provide and compare, carried out the method for channel switching.But this method does not take in for the user who is in macro diversity status in the third generation cdma system.In addition, for cdma system, from the special-purpose angle of system resource, it more is yard resource rather than power resource that the user of close base station uses, be in the CU more power resource rather than the sign indicating number resource of cell boarder, therefore at cell boarder, power resource must be optimized.Using existing method and carry out the conversion of channel type for the user of cell boarder, use and coarse open Loop Power control, also is irrational in fact.Waste power resource in order to save yard resource, its result can not save system resource, thereby can not improve the capacity of system.Therefore, existing method and be not suitable for have soft handover, the cdma system of feature such as fast power control.
Summary of the invention
Technical problem to be solved by this invention provides the method for converting types of special-purpose channel to common channel in a kind of code division multiple access system, this method be applicable to fully have soft handover, the cdma system of feature such as fast power control, and can save system resource effectively, thereby 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 special-purpose channel to common 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 capacity threshold of the transmission buffer area of the counting threshold value of counter and dedicated channel is set;
(b) base station controller system is accepted user applies and assigned with dedicated channel, controls the user oriented face simultaneously and send to measure control command, and this measurement control order includes to be measured connecting the capacity that relevant dedicated channel sends buffer area with the user;
(c) whether the measurement result in the determining step (b) satisfies report condition, if satisfy condition the then measurement physical quantity relevant, and measurement result is reported with subscriber equipment, and execution in step (d), otherwise return step (b); Wherein, described physical quantity includes the position of subscriber equipment, and described report condition comprises that dedicated channel sends the capacity of buffer area less than the respective doors limit value that is provided with in the step (a);
(d) chain of command receives reported result, and the capacity that sends buffer area when dedicated channel is during less than its threshold value, and chain of command 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 reported result satisfies the condition of channel type conversion, if satisfy, then carries out the type conversion of dedicated channel to common signal channel, otherwise, do not carry out the type conversion of dedicated channel to common signal channel, return step (b); Wherein, the condition of channel type conversion comprises that subscriber equipment is not in macro diversity status.
Further, said method can have following characteristics: also comprise the threshold value that special measurement transmitter code power is set in the described step (a); Comprise also in the step (b) that chain of command sends the measurement control command to the base station, this measurement control order includes to be measured the special measurement transmitter code power of base station; Report condition also includes the threshold value of the special measurement transmitter code power of base station greater than the special measurement transmitter code power that is provided with in the step (a) in the step (c).
Further, said method can have following characteristics: the physical quantity of measuring in the step (c) also includes the buffer memory capacity of the load and the common signal channel of sub-district.
Further, said method can have following characteristics: described counter is provided with two, is respectively to-zero counter and non-to-zero counter.
Further, said method can have following characteristics: described step (d) and step (e) can be further divided into following steps
(d1) whether judge capacity that dedicated channel sends buffer area less than its threshold value, if less than, execution in step (d2) then, otherwise return step (b);
(d2) judge that the dedicated channel of measuring sends the capacity of buffer area and whether the transmission rate of dedicated channel is 0, if be 0 execution in step (d3); Otherwise, execution in step (d4);
(d3) whether the aggregate-value of judging to-zero counter greater than the counting threshold value, if greater than, execution in step (e1) then, otherwise to-zero counter adds 1, and non-to-zero counter adds 1, returns step (b);
Whether (d4) to-zero counter is resetted zero clearing, the aggregate-value of judging non-to-zero counter greater than the counting threshold value, if greater than, execution in step (e2) then, otherwise non-to-zero counter adds 1, returns step (b);
(e1) judge whether subscriber equipment is in macro diversity status,, then carry out the type conversion of dedicated channel, otherwise do not carry out the type conversion of channel to common signal channel if be not in macro diversity status;
(e2) judge whether subscriber equipment is in macro diversity status, if be not in macro diversity status, execution in step (e3) then, otherwise non-to-zero counter adds 1, returns step (b);
(e3) judge that whether subscriber equipment is arranged in cell edge and its downlink dedicated at a distance apart from the base station and measures transmitter code power whether greater than the threshold value of the special measurement transmitter code power of step (a) setting, if judged result all is sure, then non-to-zero counter adds 1, return step (b), otherwise execution in step (e4);
(e4) judge whether the buffer memory capacity of common signal channel satisfies the data traffic requirement of dedicated channel, if judged result is sure, execution in step (e5) then, otherwise non-to-zero counter adds 1, returns step (b);
(e5) transmission rate of judging common signal channel is greater than the current transmission rate of dedicated channel, if greater than, then dedicated channel is to the channel type conversion of common signal channel, otherwise non-to-zero counter adds 1, returns step (b).
Further, said method can have following characteristics: special-purpose channel is converted to the conversion of descending execution dedicated channel to paging channel, up execution dedicated channel to Random Access Channel to the channel type of common signal channel in the described step (e1), and special-purpose channel is converted to descending execution dedicated channel to the channel type conversion to Random Access Channel of forward direction access channel, up execution dedicated channel to the channel type of common signal channel in the described step (e5).
Further, said method can have following characteristics: the capacity threshold of the counting threshold value of described counter, the transmission buffer area of dedicated channel and the threshold value of special measurement transmitter code power, in system's running, can dynamically adjust according to factors such as cell load, quality of services for users parameter, user's grade, service traffics amplitudes of variation.When the load of system surpasses certain value, reduce the counting threshold value of counter; When system loading is lower than certain value, then increase the counting threshold value of counter.
Further, said method can have following characteristics: measure control command in the described step (b) and also comprise the mode that reports that measurement result is set, described thus step (c) is further divided into following steps:
(c1) be reporting events if report mode, then judge that by the MAC layer whether dedicated channel sends the capacity of buffer area less than the respective doors limit value that is provided with in the step (a), whether the special measurement transmitter code power that the base station is judged in the base station is greater than the threshold value of the special measurement transmitter code power that is provided with in the step (a), if satisfy, then measure the position of subscriber equipment, the load of sub-district and the buffer memory capacity of common signal channel, and all measurement results are reported, 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, user's face and base station 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, then measure the position of subscriber equipment, the load of sub-district and the buffer memory capacity of common signal channel, execution in step (d), otherwise return step (b); Wherein, described reporting at interval can be adjusted according to service traffics amplitude of variation between user and the system, when service traffics change greatly, increases 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, existing method are not considered the user who is in macro diversity status in the third generation cdma system, only the capacity that sends buffer area according to dedicated channel switches with the channel that relatively carries out between the throughput that common signal channel can provide, and can not save system resource after the feasible switching; And the present invention on the basis of existing technology, fully take into account the change in location that causes owing to mobility of user equipment and whether be in macro diversity status, and combine the judgement of comprehensively whether carrying out the channel type conversion well with power control, make it to be applicable to fully have soft handover, the cdma system of feature such as fast power control, can save system resource effectively behind feasible the switching, thereby improve the capacity of cdma system.
B, further, the present invention adopt based on service traffics and control the mode that combines with power, not only can reduce the propagation delay time of burst data business, and can prevent that the interference between cell-overload and user is excessive.
C, adopt this method also can dynamically adjust, can adapt to the wireless environment of dynamic change according to the capacity threshold of all multifactor transmission buffer areas to counting threshold value, dedicated channel such as cell load, quality of services for users parameter, service traffics amplitude of variation and the threshold value of special measurement transmitter code power.
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 special-purpose channel to common 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 capacity threshold, the threshold value of special measurement transmitter code power and the parameters such as reception buffer memory capacity of common signal channel of transmission buffer area of counting threshold value, the dedicated channel of counter be set, wherein, the thresholding of special measurement transmitter code power can be set in conjunction with the operating position of power under the prerequisite of the maximum transmission power that allows less than single user; The capacity threshold of the transmission buffer area of dedicated channel 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, but do not comprise thresholding, user's face and base station are according to the measurement result that reports gap periods ground to report it to survey to chain of command, and carry out only just further judgement under satisfying less than the situation of threshold value by chain of command with the comparison of threshold value; User's face, base station 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, the data volume in the buffer area may be because of the load of common signal channel or for the needs of the increase capacity of this connection and accumulation fast.Like this, will connect possibly and switch to dedicated 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 less than threshold value, and counter just adds 1, counter is just clear 0 so if detected threshold value is greater than certain threshold value, has only when counter surpasses certain value and just further judges.Certainly, also can adopt timer, the data capacity that monitors for the first time buffer area just starts timer during less than threshold value.
Predefined counting thresholding in this method, the capacity threshold of the transmission buffer area of dedicated channel, the thresholding of special measurement TCP, the reception buffer memory capacity of common signal channel and these parameters of report cycle are all set at chain of command, these all are some parameters of using as judgement, these values are pre-set (predefined value also can obtain by the method for statistics), in system's running, can dynamically adjust then, adopt feedback mechanism, the factor that changes reference can be a cell load, user's qos parameter (QoS parameter), user's grade, amplitude that service traffics change or the like: when service traffics change greatly, so with regard to corresponding increase report cycle, can the smooth change amplitude; When service traffics change very little, so with regard to the corresponding report cycle that reduces, so that can tell variation tendency.When the load of system surpasses certain value, just reduce the threshold value of counter; When system loading is lower than certain value, just increase the threshold value of counter, the setting of threshold value can come respective settings in conjunction with load control.
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.
In cdma system, packet data domain realizes that always online function is arranged, and when the user was in the data service idle condition, the connection of network side kept, and air interface has discharged to other users' uses.
The downlink common transport channel of WCDMA system comprises forward access channel (FACH) and paging channel (PCH), and up Common transport channel is Random Access Channel (RACH).If when the transmission of the equal free of data of up-downgoing, its downlink dedicated channels is moved to PCH, the demand that has inserted fast when so both having satisfied professional the arrival has improved the utilance of air traffic channel simultaneously, has improved power system capacity greatly.
Chain of command is distinguished RLC BO and 0 is taked different treatment measures when receiving reported result, be provided with to-zero counter and non-to-zero counter, and note is made ZeroCounter respectively, NonZeroCounter, and the counting thresholding can be identical, also can be different.The condition that ZeroCounter adds up is: RLC BO is 0, and the condition that NonZeroCounter adds up is: RLC BO, satisfies condition if RLC BO is 0 equally less than threshold value.
Enter channel type conversion decision algorithm.
Whether step 301 judges RLC BO less than predefined threshold value, if less than, execution in step 302, otherwise execution in step 316;
Step 302 judges whether the RLC BO that reports is 0, if 0, then execution in step 303, otherwise execution in step 308;
Step 303 judges whether the current transmission rate that reports is 0, if 0, then execution in step 304, otherwise execution in step 308;
Step 304 judges that ZeroCounter has surpassed the counting thresholding, if surpass then execution in step 305.Otherwise execution in step 306;
Step 305 judges whether subscriber equipment (UE) is in macro diversity status, if UE is not in macro diversity status, execution in step 307, otherwise execution in step 316;
Step 309 judges whether NonZeroCounter surpasses thresholding, if do not surpass execution in step 311, otherwise execution in step 310;
Step 310 judges whether UE is in macro diversity status, if UE is not in macro diversity status, execution in step 312, otherwise execution in step 311;
Wherein, this downlink dedicated measure TCP is the down transmitting power of base station to described UE, just the special measurement transmitter code power of base station;
Step 313 judges whether the buffer memory capacity of common signal channel can satisfy the data traffic requirement of dedicated channel, if satisfy, then execution in step 314, otherwise execution in step 311;
Whether step 314, the transmission rate of judging common signal channel greater than the current transmission rate of dedicated channel, if greater than, then execution in step 315, otherwise execution in step 311;
Wherein, the current transmission rate of the transmission rate of common signal channel and dedicated channel all can be obtained by calculating by chain of command;
The present invention is used for dedicated channel is carried out method from type conversion to common signal channel in the cdma system running, mainly based on the measurement of the traffic carrying capacity of user-dependent transmission buffer area, less than the predetermined threshold value time, remove and satisfy general communication system in transmission rate, outside the conditions such as throughput, simultaneously has soft handover in conjunction with cdma system, characteristics such as rapid power control, and fully take into account residing state of UE and special measurement transmitting power, also consider the buffer memory capacity of common signal channel, the transmittabilities of common signal channel etc. are all multifactor, 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 (10)
1, the method for converting types of special-purpose channel to common 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 capacity threshold of the transmission buffer area of the counting threshold value of counter and dedicated channel is set;
(b) base station controller system is accepted user applies and assigned with dedicated channel, controls the user oriented face simultaneously and send to measure control command, and this measurement control order includes to be measured connecting the capacity that relevant dedicated channel sends buffer area with the user;
(c) whether the measurement result in the determining step (b) satisfies report condition, if satisfy condition the then measurement physical quantity relevant, and measurement result is reported with subscriber equipment, and execution in step (d), otherwise return step (b); Wherein, described physical quantity includes the position of subscriber equipment, and described report condition comprises that dedicated channel sends the capacity of buffer area less than the respective doors limit value that is provided with in the step (a);
(d) chain of command receives reported result, and the capacity that sends buffer area when dedicated channel is during less than its threshold value, and chain of command 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 reported result satisfies the condition of channel type conversion, if satisfy, then carries out the type conversion of dedicated channel to common signal channel, otherwise, do not carry out the type conversion of dedicated channel to common signal channel, return step (b); Wherein, the condition of channel type conversion comprises that subscriber equipment is not in macro diversity status.
2, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 1 is characterized in that: also comprise the threshold value that special measurement transmitter code power is set in the described step (a); Comprise also in the step (b) that chain of command sends the measurement control command to the base station, this measurement control order includes to be measured the special measurement transmitter code power of base station; Report condition also includes the threshold value of the special measurement transmitter code power of base station greater than the special measurement transmitter code power that is provided with in the step (a) in the step (c).
3, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 2 is characterized in that: the physical quantity of measuring in the step (c) also includes the buffer memory capacity of the load and the common signal channel of sub-district.
4, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 3, it is characterized in that: described counter is provided with two, is respectively to-zero counter and non-to-zero counter.
5, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 4 is characterized in that: described step (d) and step (e) can be further divided into following steps
(d1) whether judge capacity that dedicated channel sends buffer area less than its threshold value, if less than, execution in step (d2) then, otherwise return step (b);
(d2) judge that the dedicated channel of measuring sends the capacity of buffer area and whether the transmission rate of dedicated channel is 0, if be 0 execution in step (d3); Otherwise, execution in step (d4);
(d3) whether the aggregate-value of judging to-zero counter greater than the counting threshold value, if greater than, execution in step (e1) then, otherwise to-zero counter adds 1, and non-to-zero counter adds 1, returns step (b);
Whether (d4) to-zero counter is resetted zero clearing, the aggregate-value of judging non-to-zero counter greater than the counting threshold value, if greater than, execution in step (e2) then, otherwise non-to-zero counter adds 1, returns step (b);
(e1) judge whether subscriber equipment is in macro diversity status,, then carry out the type conversion of dedicated channel, otherwise do not carry out the type conversion of channel to common signal channel if be not in macro diversity status;
(e2) judge whether subscriber equipment is in macro diversity status, if be not in macro diversity status, execution in step (e3) then, otherwise non-to-zero counter adds 1, returns step (b);
(e3) judge that whether subscriber equipment is arranged in cell edge and its downlink dedicated at a distance apart from the base station and measures transmitter code power whether greater than the threshold value of the special measurement transmitter code power of step (a) setting, if judged result all is sure, then non-to-zero counter adds 1, return step (b), otherwise execution in step (e4);
(e4) judge whether the buffer memory capacity of common signal channel satisfies the data traffic requirement of dedicated channel, if judged result is sure, execution in step (e5) then, otherwise non-to-zero counter adds 1, returns step (b);
(e5) transmission rate of judging common signal channel is greater than the current transmission rate of dedicated channel, if greater than, then carry out the channel type conversion of dedicated channel, otherwise non-to-zero counter adds 1, returns step (b) to common signal channel.
6, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 5, it is characterized in that: special-purpose channel is converted to the conversion of descending execution dedicated channel to paging channel, up execution dedicated channel to Random Access Channel to the channel type of common signal channel in the described step (e1), and special-purpose channel is converted to descending execution dedicated channel to the channel type conversion to Random Access Channel of forward direction access channel, up execution dedicated channel to the channel type of common signal channel in the described step (e5).
7, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 2, it is characterized in that: the capacity threshold of the counting threshold value of described counter, the transmission buffer area of dedicated channel and the threshold value of special measurement transmitter code power, in system's running, can dynamically adjust according to cell load, quality of services for users parameter, user's grade, service traffics amplitude of variation.
8, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 7 is characterized in that: when the load of system surpasses certain value, reduce the counting threshold value of counter; When system loading is lower than certain value, then increase the counting threshold value of counter.
9, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 2 is characterized in that: measure control command in the described step (b) and also comprise the mode that reports that measurement result is set.
10, the method for converting types of special-purpose channel to common channel in the code division multiple access system according to claim 9, it is characterized in that: described step (c) is further divided into following steps:
(c1) be reporting events if report mode, then judge that by the MAC layer whether dedicated channel sends the capacity of buffer area less than the respective doors limit value that is provided with in the step (a), whether the special measurement transmitter code power that the base station is judged in the base station is greater than the threshold value of the special measurement transmitter code power that is provided with in the step (a), if satisfy, then measure the position of subscriber equipment, the load of sub-district and the buffer memory capacity of common signal channel, and all measurement results are reported, 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, user's face and base station 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, then measure the position of subscriber equipment, the load of sub-district and the buffer memory capacity of common signal channel, execution in step (d), otherwise return step (b); Wherein, described reporting at interval can be adjusted according to service traffics amplitude of variation between user and the system, when service traffics change greatly, increases to report at interval; Very little when the service traffics variation, then reduce to report at interval.
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| CN101675693B (en) * | 2007-03-06 | 2013-07-10 | 株式会社Ntt都科摩 | Mobile station, base station device, wireless communication system and communication control method |
| CN101286926B (en) * | 2007-04-10 | 2011-03-02 | 中兴通讯股份有限公司 | Method for switching PS service in TD-SCDMA between dedicated channel and common channel |
| CN101330698B (en) * | 2007-06-21 | 2012-01-11 | 中兴通讯股份有限公司 | Method and system for reporting measuring case of business volume to a leadership |
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