CN1281325A - Dynamic distribution method of channels in cellular mobile communcation system - Google Patents
Dynamic distribution method of channels in cellular mobile communcation system Download PDFInfo
- Publication number
- CN1281325A CN1281325A CN 99116292 CN99116292A CN1281325A CN 1281325 A CN1281325 A CN 1281325A CN 99116292 CN99116292 CN 99116292 CN 99116292 A CN99116292 A CN 99116292A CN 1281325 A CN1281325 A CN 1281325A
- Authority
- CN
- China
- Prior art keywords
- channel
- priority
- sub
- district
- allocation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
A dynamic distribution method of channels in cellular mobile communication system features an interference self-adaptive method based on channels distribution is used and the distribution priority of the channel in each small region is dynamically regulated according to the interference conditions of the channel in each small region and the success/failure records of channel distribution in each small region. Its advantages include small quantity of signaling exchanges, high multi plexing level of channel, and high system capacity.
Description
The present invention relates to moving communicating field, relate in particular to the resource allocation techniques in the cell mobile communication systems.
Along with the development of mobile communication, mobile communication subscriber sharply expands.So the capacity to mobile communication system has proposed more and more higher requirement.In order to seek higher capacity, the wireless coverage mode of cellular system will progressively be developed to Microcell by the sub-district.By cell splitting being become the littler Microcell of radius, can increase the spatial reuse rate of frequency spectrum, increased the capacity of system greatly.But because the irregular of radio wave propagation of microcellulor makes that the covering of microcellulor is very irregular, this just makes the planning of channel multiplexing become very difficult, in addition become impossible.
Adopting dynamics of channels to distribute is a method that addresses this problem.In this method, channel of each sub-district picked at random has judged whether that adjacent cell is using this channel.If no, then use this channel, otherwise, attempt one other channel.After introducing this method, system need not carry out channel multiplexing planning again, and channel will dynamically use.Yet, since this scheme to channel use arbitrarily, can cause the poor efficiency of spectrum utilization.
In order to overcome this shortcoming that dynamics of channels is distributed, proposed in theory many basic dynamic channel allocation to be carried out improved method.Wherein the article of Yoshihiko Akaiwa and Hidechiro Andoh " Channel Segregation-A Self-Organized Dynamic ChannelAllocation Method:Application to TDMA/FDMA MicrocellularSystem " (IEEE J-SAC Aug.1993, pp 949-954) has proposed the tight multiplexing scheme of a kind of self adaptation of utilizing the self-organizing mode to carry out the dynamics of channels distribution.And the article of A.Baiocchi etc. " The Geometric Dynamic Channel Allocation as a PracticalStrategy in Mobile Networks with Bursty User Mobility " (IEEE Trans.Veh.Technol.Vol.44, No.1, Feb.1995.pp 14-23) be a kind of scheme closely that priority guarantees channel allocation that preestablishes.
Dynamics of channels is distributed generally can be divided into two big classes according to the mode that realizes: telephone traffic self adaptation and interference adaptive.Whether the former all needs to be severe in judgment when distributing each channel has same channel to be used in the channel multiplexing distance, and this scheme needs the signaling exchange of a large amount of transmission channels in the user mode of each position.Interference adaptive then is to judge when allocated channel whether this quality of channel satisfies the quality threshold requirement of channel allocation, distributes thresholding then to distribute this channel as long as satisfy.Adopt the interference adaptive principle, help reducing the signaling exchange capacity.But, in real system, be difficult to obtain in real time whole channel statuss.
The objective of the invention is to overcome the deficiencies in the prior art part, and provide a kind of based on the interference adaptive mode, the signaling exchange capacity is few and easy realization, the channel dynamic allocation method in the cell mobile communication systems.
The object of the present invention is achieved like this, channel dynamic allocation method in a kind of cell mobile communication systems, interference adaptive mode based on channel allocation, and by channel each sub-district disturbance regime and the success/failure record of distribution dynamically adjust the distribution priority of this channel in each sub-district, thereby the dynamics of channels that realizes self-organizing character is distributed.
Method of the present invention provides the channel dynamic allocation method in a kind of cell mobile communication systems, it is characterized in that, may further comprise the steps: 1. in the initial setting up of system, each sub-district in the system of giving all disposes whole channels, and each sub-district is all disposed the priority that channel separately uses; 2. in service in system, the channel allocation process in each sub-district is that according to priority height begins to judge successively and handle from the highest channel of priority; And, adjust the priority of channel in each sub-district according to the disturbance regime of channel and the historical success/failure record of distribution, when channel disturbance reduces or be allocated successfully, then improve the priority of channel allocation; On the contrary, when channel disturbance strengthens or distribute failure, then reduce the priority of channel allocation.
Channel dynamic allocation method in the cell mobile communication systems of the present invention, interference adaptive mode based on channel allocation, and by channel each sub-district disturbance regime and the success/failure record of distribution dynamically adjust the distribution priority of this channel in each sub-district, the signaling exchange capacity is few and easy realization.Implement the channel multiplexing degree that the inventive method can improve Digital Cellular System, thereby improve the capacity of system, and avoided the channel multiplexing planning of micro cellular system difficulty, have very strong practicality.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Fig. 1 is the system block diagram of the mobile communication system of application the inventive method;
Fig. 2 is the initial channel configuration schematic diagram of the basic sub-district in the mobile communication system of using the inventive method;
Fig. 3 is the channel priority initial setting schematic diagram of first embodiment of the inventive method;
Fig. 4 is the channel allocation process flow chart of first embodiment of the inventive method;
Fig. 5 is the cell classification sign schematic diagram of second embodiment of the inventive method;
Fig. 6 is the channel priority initial setting up schematic diagram of second embodiment of the inventive method;
Fig. 7 is the channel allocation process flow chart of the 3rd embodiment of the inventive method.
We are example explanation the present invention with the GSM digital mobile communication system, but method of the present invention goes for the cell mobile communication systems of other types equally.
As shown in Figure 1, the mobile communication system of application the inventive method is included in several travelling carriages (MS) 14 that move in the system service district, base transceiver station (BTS) 13, base station controller (BSC) 12 and mobile switching centre (MSC) 11.Usually, base station controller a plurality of base transceiver stations good at managing.And a plurality of systems as shown in Figure 1 will link to each other by a mobile switching centre in a real system.
As shown in Figure 2, give the transceiver (TRX) of each the cell configuration some in the mobile communication system of using the inventive method, each transceiver has the channel (Ch) of some.With the gsm system is example, and a TRX is applied to a fixing frequency, and a frequency is divided into 8 time slot channels.So under the situation of basic configuration, the quantity of cell carrier frequencies (being TRX) has just determined the scope of the channel that the sub-district can be used.
The first embodiment of the present invention and second embodiment all adopt this configuration.For can realize to all channels use, need all dispose whole channels to each sub-district.First embodiment:
In the first embodiment of the present invention, method of the present invention may further comprise the steps: 1. all be equipped with whole channels for all sub-districts.Simultaneously, when system's initial launch, do not distinguish the channel search order of each sub-district yet.All dispose as shown in Figure 3 channel priority chain for all sub-districts, promptly each sub-district is provided with channel priority separately respectively.2. after system brings into operation, each sub-district all will be according to allocation flow allocated channel shown in Figure 4: 1) when a calling produces in the sub-district or have a switching to enter the sub-district, channel allocation process will begin to judge from the highest channel of channel priority; 2) when this channel idle and channel quality satisfy channel and insert threshold requirement, then this channel allocation is given and call out, adjust priority according to following channel priority adjustment algorithm simultaneously, and change 7).Na=Na+1; Ph=Nf/Na; P=A*Pq+B*Ph; 3) taken when this channel, change 5 by this sub-district) 4) when this quality of channel does not satisfy when inserting thresholding, adjust priority according to following priority adjustment algorithm.Ns=Nf+1; Na=Na+1; Ph=Nf/Na; P=A*Pq+B*Ph; 5) if be last channel, then change 6), otherwise the channel of selecting priority to take second place, and change 2).6) blocked call.7) finish.
In the top formula, Ns is the total degree of the selected trial of channel, and Na is the total degree of channel allocation success, and Nf is the total degree of channel allocation failure.P represents the priority of channel, Ph represents the historical mortality of channel allocation, Pq represents the relative value of quality of channel, usually interference that can be by calculating this channel obtains with the ratio of the interference value of the channel with maximum interference, concrete implementation may be different, but thinking is all identical with the present invention, as long as guarantee to have tangible monotone variation when the channel quality monotone variation.A and B are the adjustment weights of two kinds of factors when adjusting priority.
The every certain interval of time T of the present invention carries out one-time detection to each quality of channel situation (as the channel interference level that receives or carrier/interface ratio), and the channel that quality is changed carries out the priority adjustment simultaneously.With the channel disturbance data of obtaining is that interference level LI is an example, and the priority adjustment algorithm of channel Ch (k) is:
Pq=LI
k／Max?(LI
i｜i=1，N)；
P=A*Pq+B*Ph; Can see, Pq itself has reflected the priority orders that channel uses in the sub-district, but because its acquisition (needs a large amount of processing times because if obtain the disturbed condition of all channels at any time) often inadequately in real time in real system, so the present invention is allocated successfully the deficiency that remedies Pq in the record Ph adding priority with the history of channel.When of the present invention, can set the weight of the two for practical application neatly according to the concrete difference of system.If system can obtain the real-time disturbed condition of all channels in time, then can be set to much larger than B by A, even B is set to 0; On the contrary, if the disturbance state of channel is difficult for obtaining, then can adjust A is 0, and only uses the channel allocation historical record to carry out the priority adjustment.
System is by the operation of a period of time, and the channel priority of each sub-district will be adjusted to the state of each self-separation, has realized the adaptive configuration of channel.
But first embodiment does not consider in the real system situation based on the system (as GSM) of TDMA/FDMA.Concrete channel is the time slot on the different frequent points in gsm system.A frequency is realized 8 full speed channels by being divided into 8 time slots.And the implementation of first embodiment is not considered the close natural link of this frequency and time slot.In the channel use, may cause each sub-district all only to use the separate channel in the different frequent points.This uses for equipment is irrational, and when the configuration of equipment is not enough (as the 3rd embodiment), this influence is more serious.We propose the second embodiment of the present invention for this reason.Second embodiment:
In the second embodiment of the present invention, the inventive method may further comprise the steps: 1. all be equipped with whole channels for all sub-districts.Initial selected to the channel of each sub-district is stipulated in proper order, promptly just channel is provided with initial priority when system initialization.Below in conjunction with Fig. 5 and Fig. 6 the setting of the initial priority of present embodiment is described in detail.
In a second embodiment, each sub-district is divided into the K class according to multiplexer mode K, as shown in Figure 5, is the example that a sub-district is divided into seven classes.When initialization, carry out different channel prioritys for different classes of sub-district and set.As shown in Figure 6, the starting point of the channel priority of different sub-districts (being limit priority) staggers each other, and for the category-A sub-district, channel wherein is arranged as from high to low according to the channel initial priority: Ch1, and Ch2, Ch3 ..., Ch N; Category-B is: Ch i, and Ch i+1 ..., Ch N, Ch1, Ch2 ..., Ch i-1; The channel priority of G class sub-district is in proper order: Ch k, and Ch k+1 ..., Ch N, Ch1, Ch2 ..., Ch k-1.Wherein the division border of each native region priority starting point can roughly be provided with according to the desired value that the telephone traffic of all kinds of sub-districts is loaded, as being made as limit priority by the maximum channel of expection telephone traffic load.
By such division, channel can at first be followed the order of initial priority in use and carry out.Like this, reduced on the one hand the conflict that channel uses, also can solve simultaneously in the channel set of similar same carrier frequency and use such problem, will use in some channel set by the guidance system that is provided with of initial priority.2. adopt as channel allocation flow process and the priority of first embodiment and adjust mode.The 3rd embodiment:
The third embodiment of the present invention is the further improvement to second embodiment.
Two embodiment of front are all channels that all sub-districts have been equipped with system, but this outfit means the redundancy of a large amount of transceivers.When the channel initial priority is provided with among second embodiment by introducing, with the channel of each sub-district use concentrate as far as possible after, the phenomenon of equipment redundancy will be more obvious.Even some transceivers may occur and be in untapped state always.On the other hand, if we suppose that in the present invention transceiver can be applied to different frequencies and time slot in real time, reason is reduced to a large amount of equipment redundancies the channel configuration number that satisfies certain calling rate requirement under the maximum telephone traffic in sub-district with regard to having more fully for we.
But, when (referring to not dispose the equipment that whole channels use simultaneously), channel idle may appear in the equipment configuration deficiency, there is not the situation (although under the prerequisite of second embodiment, this situation reduces to some extent) of device service.When this situation occurred, how adjusting channel priority just became a problem.Think in the document of Yoshihiko Akaiwa that if reduce the priority of channel under this situation, then the overall performance of system will fall into the local optimum point.For this reason, he proposes in this case channel priority to be improved.So as shown in Figure 7, in the 3rd embodiment, after system brought into operation, to channel idle and noiseless, but because the equipment deficiency in the time of can't using, was adjusted priority according to channel allocation success situation equally.So the channel allocation flow process change of present embodiment is as follows: 1) when a calling produces in the sub-district or have a switching to enter the sub-district, channel allocation process will begin to judge from the highest channel of channel priority; 2) when this channel idle and free device is arranged, when channel quality also satisfies channel and inserts threshold requirement, then this channel allocation is given and call out, adjust priority according to following channel priority adjustment algorithm simultaneously, and change 7).Na=Na+1; Ph=Nf/Na; P=A*Pq+B*Ph; 3) if channel idle and satisfy to insert thresholding, but do not have free device when inserting, it is as follows to adjust channel priority, and changes 6).Na=Na+1; Ph=Nf/Na; P=A*Pq+B*Ph; 4) taken when this channel, change 6 by this sub-district) 5) when this quality of channel does not satisfy when inserting thresholding, adjust priority according to following priority adjustment algorithm.Ns=Nf+1; Na=Na+1; Ph=Nf/Na; P=A*Pq+B*Ph; 6) if be last channel, then change 6), otherwise the channel of selecting priority to take second place, and change 2).7) blocked call.8) finish.
Claims (7)
1. the channel dynamic allocation method in the cell mobile communication systems is characterized in that, may further comprise the steps:
1) in the initial setting up of system, all disposes whole channels for each sub-district in the system, and each sub-district is all disposed the priority that channel separately uses;
2) in service in system, the channel allocation process in each sub-district is that according to priority height begins to judge successively and handle from the highest channel of priority; And, adjust the priority of channel in each sub-district according to the disturbance regime of channel and the historical success/failure record of distribution, when channel disturbance reduces or be allocated successfully, then improve the priority of channel allocation; On the contrary, when channel disturbance strengthens or distribute failure, then reduce the priority of channel allocation.
2. channel dynamic allocation method according to claim 1 is characterized in that: in step 1), the method to set up of initial priority is to be classified according to multiplexer mode in each sub-district; The starting point of the channel priority of different classes of sub-district is staggered each other.
3. channel dynamic allocation method according to claim 2 is characterized in that: in step 1), in the described different classes of sub-district, the maximum channel of expection telephone traffic load is made as the channel of limit priority.
4. channel dynamic allocation method according to claim 1 and 2 is characterized in that: in described step 2) in, the channel allocation of each sub-district adopts following flow process:
(1) when a calling produces in the sub-district or have a switching to enter the sub-district, channel allocation process will begin to judge from the highest channel of channel priority;
(2) when this channel idle and channel quality satisfy channel and insert threshold requirement, then this channel allocation is given and call out, adjust priority according to following channel priority adjustment algorithm simultaneously, and change (7);
Na=Na+1；
Ph=Nf／Na；
P=A*Pq+B*Ph；
(3) taken when this channel, change (5) by this sub-district
(4) when this quality of channel does not satisfy the access thresholding, adjust priority according to following priority adjustment algorithm;
Ns=Nf+1；
Na=Na+1；
Ph=Nf／Na；
P=A*Pq+B*Ph；
(5) if be last channel, then change (6), otherwise the channel of selecting priority to take second place, and commentaries on classics (2);
(6) blocked call;
(7) finish;
In the top formula, Ns is the total degree of the selected trial of channel, and Na is the total degree of channel allocation success, and Nf is the total degree of channel allocation failure; P represents the priority of channel, and Ph represents the historical mortality of channel allocation, and Pq represents the relative value of quality of channel, and A and B are the adjustment weights of two kinds of factors when adjusting priority.
5. channel dynamic allocation method according to claim 4 is characterized in that: in described step 2) in, the algorithm of the priority of reflection channel quality is:
Pq=LI
k／Max(LI
i｜i=1，N)
Wherein, LI represents interference level.
6. channel dynamic allocation method according to claim 1 and 2, it is characterized in that: in described step 2) in, the channel allocation of each sub-district adopts following flow process: (1) when a calling produces in the sub-district or have a switching to enter the sub-district, channel allocation process will begin to judge from the highest channel of channel priority; (2) when this channel idle and free device is arranged, when channel quality also satisfies channel and inserts threshold requirement, then this channel allocation is given and call out, adjust priority according to following channel priority adjustment algorithm simultaneously, and change (7);
Na=Na+1；
Ph=Nf／Na；
P=A*Pq+B*Ph；
(3) if channel idle and satisfy to insert thresholding, but do not have free device when inserting, it is as follows to adjust channel priority, and changes (6);
Na=Na+1；
Ph=Nf／Na；
P=A*Pq+B*Ph；
(4) taken when this channel, change (6) by this sub-district
(5) when this quality of channel does not satisfy the access thresholding, adjust priority according to following priority adjustment algorithm;
Ns=Nf+1；
Na=Na+1；
Ph=Nf／Na；
P=A*Pq+B*Ph；
(6) if be last channel, then change (6), otherwise the channel of selecting priority to take second place, and commentaries on classics (2);
(7) blocked call;
(8) finish.
7. channel dynamic allocation method according to claim 6 is characterized in that: in described step 2) in, the algorithm of the priority of reflection channel quality is:
P
q=LI
k／Max(LI
i｜i=1，N)
Wherein, LI represents interference level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991162927A CN1138435C (en) | 1999-07-16 | 1999-07-16 | Dynamic distribution method of channels in cellular mobile communcation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991162927A CN1138435C (en) | 1999-07-16 | 1999-07-16 | Dynamic distribution method of channels in cellular mobile communcation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1281325A true CN1281325A (en) | 2001-01-24 |
| CN1138435C CN1138435C (en) | 2004-02-11 |
Family
ID=5279126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991162927A Expired - Fee Related CN1138435C (en) | 1999-07-16 | 1999-07-16 | Dynamic distribution method of channels in cellular mobile communcation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1138435C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417234C (en) * | 2002-10-11 | 2008-09-03 | 中兴通讯股份有限公司 | Method for distributing business channels for GSM system |
| CN100450201C (en) * | 2007-03-15 | 2009-01-07 | 上海交通大学 | Distributed adaptive dynamic channel dispatching method |
| CN1518325B (en) * | 2003-01-17 | 2010-04-28 | 华为技术有限公司 | Route priority dynamic regulation method for IP telephone system |
| CN101170831B (en) * | 2007-11-13 | 2010-06-16 | 中兴通讯股份有限公司 | Channel allocation method in time division synchronization code division multi-address access system |
| CN101588632B (en) * | 2009-06-17 | 2011-04-20 | 华为技术有限公司 | Allocation method, device and base station for physical downlink control channel time domain symbolic number |
| CN101106417B (en) * | 2007-08-20 | 2011-05-11 | 北京航空航天大学 | A satellite call access control method |
| CN101854643B (en) * | 2009-03-31 | 2012-07-04 | 中国移动通信集团广西有限公司 | Wireless resource multiplexing method and equipment and system thereof |
| CN102118871B (en) * | 2010-01-06 | 2014-05-21 | 鼎桥通信技术有限公司 | Method for dynamically adjusting bearer channel accessed by wireless resource |
-
1999
- 1999-07-16 CN CNB991162927A patent/CN1138435C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417234C (en) * | 2002-10-11 | 2008-09-03 | 中兴通讯股份有限公司 | Method for distributing business channels for GSM system |
| CN1518325B (en) * | 2003-01-17 | 2010-04-28 | 华为技术有限公司 | Route priority dynamic regulation method for IP telephone system |
| CN100450201C (en) * | 2007-03-15 | 2009-01-07 | 上海交通大学 | Distributed adaptive dynamic channel dispatching method |
| CN101106417B (en) * | 2007-08-20 | 2011-05-11 | 北京航空航天大学 | A satellite call access control method |
| CN101170831B (en) * | 2007-11-13 | 2010-06-16 | 中兴通讯股份有限公司 | Channel allocation method in time division synchronization code division multi-address access system |
| CN101854643B (en) * | 2009-03-31 | 2012-07-04 | 中国移动通信集团广西有限公司 | Wireless resource multiplexing method and equipment and system thereof |
| CN101588632B (en) * | 2009-06-17 | 2011-04-20 | 华为技术有限公司 | Allocation method, device and base station for physical downlink control channel time domain symbolic number |
| CN102118871B (en) * | 2010-01-06 | 2014-05-21 | 鼎桥通信技术有限公司 | Method for dynamically adjusting bearer channel accessed by wireless resource |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1138435C (en) | 2004-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1204776C (en) | Call Cut-in control method | |
| JP3073484B2 (en) | Data communication method between base station and mobile terminal in mobile communication system | |
| JP2719619B2 (en) | Mobile communication channel assignment control method | |
| CN100450201C (en) | Distributed adaptive dynamic channel dispatching method | |
| CN1531790A (en) | Adaptive uplink/downlink timeslot assigment in hybrid wireless time division multiple access/code division multiple access communication system | |
| CN1115930C (en) | Channel distribution method for hierarchical cellular mobile communication system | |
| CN1268073C (en) | Allocation of timeslots in cellular communication system | |
| CN1138435C (en) | Dynamic distribution method of channels in cellular mobile communcation system | |
| CN100356812C (en) | Method for dynamic channel allocation of multi carrier time division duplex communication system | |
| CN1147060C (en) | Adaptive power margin for hard handoffs in code division multiple access based systems | |
| CN1176563C (en) | Dynamic channel allocating method | |
| CN1210901C (en) | Resource allocation method on switching for CDMa base station system | |
| CN1564483A (en) | Dynamic channel distributing method of TD-SCDMA | |
| CN101030812A (en) | Method for grouping N-frequency point network | |
| CN1195387C (en) | Dynamic allocation method for communication channel in time-division duplex communication system | |
| CN1190980C (en) | Channel distribution method for multiple services at base station in GPS system | |
| CN100525158C (en) | Method and device for using cross time slot resource in time division duplex CDMA system | |
| CN1668134A (en) | Method for dynamic channel allocation in TD-SCDMA system | |
| CN1568055A (en) | A networking method for time division duplexing mode cellular network | |
| CN103368604A (en) | Multipath searching method and device of adaptive adjustment search windows | |
| JP2908991B2 (en) | Wireless channel allocation method | |
| CN107249206B (en) | Wireless access point selection method with resource allocation optimization effect | |
| CN101350665B (en) | Method for synchronizing terminal of great bandwidth radio communication system and method for framing | |
| Nyangaresi et al. | Multivariate probabilistic synthesis of cellular networks teletraffic blocking with poissonian distribution arrival rates | |
| Mar et al. | Intelligent data rate control in cognitive mobile heterogeneous networks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040211 Termination date: 20170716 |