WO2002080406A1 - Apparatus and method of controlling reverse transmission in a mobile communication system - Google Patents
Apparatus and method of controlling reverse transmission in a mobile communication system Download PDFInfo
- Publication number
- WO2002080406A1 WO2002080406A1 PCT/KR2002/000555 KR0200555W WO02080406A1 WO 2002080406 A1 WO2002080406 A1 WO 2002080406A1 KR 0200555 W KR0200555 W KR 0200555W WO 02080406 A1 WO02080406 A1 WO 02080406A1
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- Prior art keywords
- data rate
- reverse
- extended
- rab
- increase
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0876—Network utilisation, e.g. volume of load or congestion level
- H04L43/0894—Packet rate
Definitions
- the present invention relates generally to a transmission controlling method in a mobile communication system, and in particular, to a method of controlling reverse transmission.
- CDMA Code Division Multiple Access
- HDR High Data Rate
- the forward link is a link directed from a base station to an access terminal (AT) and "a reverse link” is the opposite link.
- AT access terminal
- a reverse link is the opposite link.
- the base station transmits data to a particular AT in the best channel condition, considering the air link statuses between the base station and lxEV-DO ATs and other environments, resulting in a maximized data transmission throughput for the AT.
- Concerning reverse data transmission a plurality of ATs access the base station simultaneously. In this situation, the base station controls overload within reverse link capacity by appropriately controlling congestion and data flows from the ATs.
- an AT carries out reverse data transmission based on an RAB (Reverse Activity Bit) and an RRL (ReverseRateLimit) message received from a base station, and tells the base station its variable data rate via an RRI (Reverse Rate Indicator).
- the RRI indicates to the base station the data rate at which the reverse traffic data is being sent.
- the base station transmits the following time-multiplexed channels to the AT: a forward MAC (Medium Access Control) channel, a pilot channel, an FAB (Forward Activity Bit) channel and an RAB channel.
- the RAB represents the congestion degree of the reverse link and a data rate available to the AT varies according to the RAB.
- the base station controls a data flow from the AT by commanding an increase/decrease in the reverse data rate using the RAB to control the overload and capacity of the reverse link. Since the RAB is broadcast to a plurality of ATs, the ATs receiving the RAB increase their data rates or reduce them uniformly according to the RAB.
- the transmission time (or transmission period) of the RAB is determined by Equation (1):
- T is system time and RABlength is the length of the RAB expressed in the number of slots.
- Table 1 below lists binary values representing RAB lengths.
- the base station transmits one of the binary values to the ATs and then the ATs calculate a slot time they receive the RAB on a forward MAC channel (F-MAC channel) using the received RABlength information and the system time.
- F-MAC channel forward MAC channel
- An AT receives a persistence vector defined in a message from the base station at or during a connection.
- the AT performs a persistence test. If the persistence test is passed, the AT increase the reverse data rate or reduces it. If the persistence test is failed, then the AT maintains the reverse data rate.
- the reverse data rate is increased.
- the RAB is 1 and the persistence is passed, the reverse data rate is reduced.
- the success or failure of the persistence test depends on whether a generated random number satisfies a desired condition. Since the reverse data rate varies with uncertainty in probability terms, the base station does not know how many ATs increase/decrease their data rates. Time delay occurs on the reverse link until a high capacity state is transitioned to a full utilization state. In the reverse link full utilization state, overload and underload alternate. However, the base station cannot know how serious the overaload or underload condition because the base station simply transmits an RAB and the ATs increase/decrease their data rates according to the results of persistence tests.
- FIG. 1 is a flowchart illustrating a reverse data rate controlling procedure for an AT in an existing lxEV-DO system.
- the AT sets its lowest available data rate at an initial reverse data transmission. If the current data rate is lower than a data rate provided in an RRL message received from a base station, the AT transmits data at the provided data rate after 32 slots (53.33ms). On the other hand, if the current data rate is higher than the provided data rate, the AT transmits data at the provided data rate. For the subsequent reverse transmission, the AT determines its data rate by the procedure illustrated in FIG. 1. The RRL message is transmitted to the AT in determining an initial reverse data rate and resetting the reverse data rate.
- the AT After determining its data rate, the AT reports its data rate to the base station by an RRI symbol as shown in Table 2.
- the reverse data rate is selected among 4.8, 9.6, 19.2, 38.4, 76.8 and 153.6 kbps. This reverse data rate is reset by a message such as an RRL message or an RAB message received from the base station.
- Table 2 below lists RRI mappings in the lxEV-DO system.
- the base station determines the data rate of the AT from the RRI symbols as shown in Table 2 and controls the AT to reset its data rate. To aid the AT in resetting its data rate, the base station should transmit an RRL message as shown in Table 3 to the AT.
- the RRL message is forward directed to control a reverse data rate.
- the AT Upon receipt of the RRL message, the AT resets the reverse data rate by comparing the current reverse data rate with a data rate set in the RRL message.
- 29 records may be inserted in the above RRL message and each record indicates a data rate assigned to a corresponding MACindex among MACindexes 3 to 31.
- RateLimitlncluded is a field indicating whether RateLimit is included in the RRL message. If
- RateLimit is included, RateLimitlncluded is set to 1 and otherwise, it is set to 0.
- RateLimit indicates a data rate assigned to a corresponding AT.
- the base station assigns data rates shown in Table 4 to ATs using four bits.
- the AT monitors a F-MAC channel from the base station, especially the RAB on the F-MAC channel, and adjusts its current data rate by performing a persistence test.
- the AT monitors the RAB of an F-MAC channel from a base station included in the active set of the AT in step 100 and determines whether the RAB is 1 in step 102. If the AT has six sectors/base stations in its active set, it determines whether at least one of the RABs of the F- MAC channels received from the six sectors/base stations is 1. If at least one RAB is 1, the AT proceeds to step 112 and otherwise, it goes to step 104.
- the AT performs a persistence test in step 104.
- the persistence test is available ' when the base station broadcasts the RAB to a plurality of ATs to control the amount of reverse data from the ATs.
- the persistence test is passed or failed depending on whether a generated random number satisfies a desired condition.
- the AT increases its data rate (TX rate) in step 106. On the contrary, if the persistence test is failed, the AT jumps to step 120.
- the AT increases the TX rate in step 106 and compares the increased TX rate with a maximum allowed data rate (a max TX rate) in step 108. If the increased TX rate is higher than the max TX rate, the AT sets the TX rate to the max TX rate in step 110 and goes to step 120. If, in step 108, the increased TX rate is not higher than the max TX rate, the AT goes directly to step 120
- step 102 If the RAB is 1 in step 102, the AT performs a persistence test in step 112.
- the AT jumps to step 120. If the persistence test is passed, the AT decreases the TX rate in step 114 and compares the decreased TX rate with a minimum data rate (a min TX rate) in step 116. If the decreased TX rate is lower than the min TX rate, the AT goes to step 118 and otherwise, it jumps to step 120. The AT sets the TX rate to the min TX rate in step 118 and goes to step 120.
- the min TX rate can be a default data rate of 9.6 kbps or a data rate designated by some message at a call connection.
- step 120 the AT generates an RRI symbol corresponding to the set TX rate.
- the AT transmits the RRI symbol along with traffic data only if a traffic connection is opened between the base station and the AT. If the traffic connection is not opened, it transmits only the RRI symbol.
- FIG. 2 is a diagram illustrating data transmission/reception between an
- F- and R-traffic channels, and F- and R-MAC channels have been established between the AT and sector 1 with a connection opened between them.
- No F- traffic channels are assigned to the AT from sector 2 (up to sectors 2 to 6) with no connection opened between them.
- the AT can maintain up to six sectors/base stations in its active set. Therefore, to determine its TX rate, the AT monitors F-MAC channels from all the sectors of the active set, especially RABs on the F-MAC channels.
- the AT Upon receipt of at least one RAB set to 1, the AT performs a persistence test to decrease its TX rate.
- the AT In the persistence test, the AT generates a random number and compares it with a persistence vector defined by the base station at or during a connection. If the random number satisfies a desired condition, the AT determines that the persistence test is passed. The AT then decreases the TX rate. On the contrary, if the persistence test is failed, the AT maintains the TX rate. If the TX rate is lower than a min TX rate, the AT sets the TX rate at the min TX rate. Meanwhile, if all the RABs are set to 0 and a persistence test is passed, then the TX rate is increased. If the persistence test is failed, the AT maintains the TX rate.
- the AT sets the TX rate to the max TX rate. Also, in the case where the AT is limited in transmission power, it maintains the TX rate.
- the RAB that functions to increase a reverse data rate or reduces it is broadcast to ATs in TDM with an FAB on a forward common channel, i.e., a F-MAC channel. The ATs increase/decrease their data rates uniformly according to the RAB.
- the above-described reverse transmission controlling method for the current lxEV-DO systems simplifies bandwidth control and overhead control.
- the uniform control without considering the individual statuses of ATs brings about a bandwidth waste and decreases the data transmission efficiency of the ATs.
- an object of the present invention to provide a method of rapidly reaching the full utilization state of a reverse link.
- a mobile station After receiving forward information commanding a reverse data rate change on a forward control channel from a base station, a mobile station increases its data rate to be equal to or lower than a maximum data rate if the forward information commands a reverse data rate increase, determines whether the increased data rate can be further increased for the next frame, and transmits the determination result with information representing the increased data rate to the base station.
- the mobile station increases its data rate to be equal to or lower than a maximum data rate based on information indicating whether a data rate increase is available that is determined at the previous frame transmission. Then, the mobile station determines whether the increased data rate can be further increased for the next frame and transmits the determination result with information representing the increased data rate to the base station.
- the mobile station decreases its data rate to be equal to or higher than a minimum data rate based on information determined at the previous frame transmission indicating whether a data rate increase is available. Then, the mobile station determines whether the decreased data rate can be increased for the next frame and transmits the determination result with information representing the increased data rate to the base station.
- the mobile station determines whether the maintained reverse data rate can be increased for the next frame and transmits the determination result with information representing the increased data rate to the base station.
- the forward information is an extended RAB. If the forward information is received from at least two base stations, a control RAB is generated from extended RABs received from the base stations. Changing the reverse data rate is determined based on the control RAB.
- the control RAB is set to indicate a conditional decrease. If none of the extended RABs indicate a conditional decrease and at least one of the extended RABs indicates an unconditional data rate maintenance, the control RAB is set to indicate an unconditional data rate maintenance. If none of the extended RABs indicate either a conditional decrease or an unconditional data rate maintenance and at least one of the extended RABs indicates a conditional increase, the control RAB is set to indicate a conditional increase. Finally, if all the extended RABs indicate an unconditional increase, the control RAB is set to indicate an unconditional increase.
- a base station After receiving reverse information indicating whether a reverse data rate increase is available for the next reverse frame from a mobile station, a base station determines the highest data rate allowed to the mobile station by mobile station acquisition and characteristic analysis, generates a reverse data rate value, transmits information representing the highest data rate and the reverse data rate value to the mobile station, determines an extended RAB based on the received reverse information and the current capacity of a reverse link, and transmits the extended RAB to the mobile station. If the reverse link is in an overload state, the extended RAB is set to indicate a conditional data rate decrease. If an increase in the data rates of all mobile stations within the coverage area of the base station does not cause overload on the reverse link, the extended RAB is set to indicate an unconditional data rate increase.
- the extended RAB is set to indicate a conditional data rate increase. Finally, if the reverse link is not in an overload state and cannot accommodate an increase in the data rates of all the mobile stations, the extended RAB is set to indicate an unconditional data rate maintenance.
- FIG. 1 is a flowchart illustrating a reverse data rate controlling method for a mobile station in a conventional mobile communication system
- FIG. 2 is a diagram illustrating data transmission/reception between a mobile station and a sector included the active set of the mobile station;
- FIGs. 3A to 3F are flowcharts illustrating a reverse data rate controlling method for a mobile station in a data transmission system according to an embodiment of the present invention
- FIG. 4 is a flowchart illustrating a reverse data rate controlling method for a base station in the data transmission system according to the embodiment of the present invention.
- FIG. 5 is a flowchart illustrating a method of generating an extended RAB for control of reverse data rates in the base station in the data transmission system according to the embodiment of the present invention.
- the present invention provides a reverse data rate controlling method for a mobile station (MS) and new RAB and new RRI structures for supporting the method in a system and a novel high rate data transmission system according to the present invention.
- a base station operation for supporting the reverse data rate controlling method is also provided.
- the new RAB and new RRI according to the present invention will be hereinafter referred to as an extended RAB and an extended RRI, respectively.
- a 1-bit RAB simply represents the increase or decrease of a reverse data rate in the conventional system, whereas the extended RAB shown in Table 5 represents the increase, maintenance, and decrease of a reverse data rate in the present invention.
- a mobile station increase its data rate, only if it passed its previous increase persistence pre-test for a data rate increase in the previous frame. In this case, the reverse data rate increase is conditional.
- a mobile station reduces its data rate, only if it has passed a decrease persistence test for a data rate decrease. In this case, the reverse data rate decrease is conditional.
- FIGs. 3 A to 3F are flowcharts illustrating a reverse data rate controlling method for a mobile station in a data transmission system according to an embodiment of the present invention.
- the mobile station monitors extended RABs received on F-MAC channels from all base stations in its active set in step 300. Only the reverse data rates that are defined by RRI symbols are available.
- the mobile station can maintain up to six sectors/base stations in its active set. An active set is a set of sectors/base station serving a mobile station. If a connection is opened between the mobile station and a base station in the active set, F- and R-traffic channels and a reverse power control channels are assigned to the mobile station. With no connection opened, the mobile station monitors only a control channel from the base station.
- the mobile station determines "a control RAB" according to a received extended RAB as follows.
- control RAB is set to 10.
- the control RAB set under the above conditions has a great influence on the capacity of a sector in the case of a reverse data rate increase.
- PreTestRes representing the result of the increase persistence pre-test
- step 318 the mobile station performs an increase persistence pre-test to control the reverse TX rate for the next frame. If the increase persistence pretest is passed, the mobile station sets the variable PreTestRes to 0 in step 320 and selects and transmits an RRI symbol representing the set TX rate in step 380 in FIG 3f. On the contrary, if the increase persistence pre-test is failed, the mobile station sets the variable PreTestRes to 1 in step 322 and selects and transmits an RRI symbol representing the set TX rate in step 382 in FIG 3f.
- the mobile station determines that the increase persistence pre-test is failed regardless of its real implementation in the case where the TX rate is limited by an RRL message that provides a maximum allowed data rate to each mobile station, when the mobile station has too limited transmission power to increase the TX rate, or the amount of data stored in a buffer is a threshold or less (i.e., the stored data can be transmitted without increasing the TX rate).
- Table 6 lists RRI mappings to reverse data rates according to the present invention.
- the extended RRI listed in Table 6 are a modification from the conventional RRI to indicate to the base station at what rate the reverse data is being sent. Based on the acquired reverse data rate, the base station recovers the original reverse data.
- the extended RRI is designed to represent the reverse data rates defined by the lxEVDV systems with PreTestRes set in the first field.
- step 304 the mobile station performs a decrease persistence test in step 330 in FIG 3c. If the decrease persistence test is passed, the mobile station goes to step 332 and otherwise, it jumps to step 338. The mobile station decreases its TX rate in step 332 and compares the decreased TX rate with a min TX rate in step 334. If the decreased TX rate is lower than the min TX rate, the mobile station proceeds to step 336 and otherwise, it goes to step 338. In step 336 the mobile station sets the TX rate to the min TX rate and goes to step 338.
- step 338 the mobile station performs an increase persistence pre-test to control the reverse TX rate for the next frame. If the increase persistence pre- test is passed, the mobile station sets the variable PreTestRes to 0 in step 340, and selects an RRI symbol representing the set TX rate from a table such as Table 6 and transmits the selected RRI symbol in step 380 in FIG 3f. On the contrary, if the increase persistence pre-test is failed, the mobile station sets the variable PreTestRes to 1 in step 342, and selects an RRI symbol representing the set TX rate from a table such as Table 6 and transmits the selected RRI symbol in step 382 in FIG 3f.
- the mobile station sets the variable PreTestRes to 1, determining that the increase persistence pre-test is failed regardless of its real implementation in the case where the TX rate is limited by an RRL message, when the mobile station has too limited transmission power to increase the TX rate, or the amount of data stored in a buffer is a threshold or less.
- step 370 the mobile station checks the variable PreTestRes representing the result of the previous increase persistence test, which was performed to report the reverse link condition for the previous frame in FIG 3e. If PreTestRes is 0, that is, a TX rate increase is available, the mobile station performs an increase persistence pre-test to control the reverse TX rate for the next frame in step 372.
- the mobile station sets the variable PreTestRes to 0 in step 374, and selects an RRI symbol representing the set TX rate from a table such as Table 6 and transmits the selected RRI symbol in step 380 in FIG 3f.
- PreTestRes is 1 in step 370 or if the increase persistence pre-test is failed in step 372
- the mobile station sets the variable PreTestRes to 1 in step 376, and selects an RRI symbol representing the set TX rate from a table such as Table 6 and transmits the selected RRI symbol in step 382 in FIG 3f.
- FIG. 4 is a flowchart illustrating a reverse data rate controlling method for a base station in the high rate data transmission system according to the embodiment of the present invention.
- the base station upon receipt of connection open requests from mobile stations, the base station carries out mobile station acquisition in step 400 and analyzes the characteristics of the mobile stations in step 402.
- the base station analyses the characteristics of reverse traffic received from the mobile stations, that is, determines QoS (Quality of Service) of packet data services requested by the mobile stations.
- the base station sets MACindex fields by which the mobile stations are identified.
- the base station sets RateLimit fields that limit the data rates of the mobile stations based on the characteristics of the mobile stations and their application services in step 408.
- the base station assembles the RRL message with Message ID and other related message fields for transmission in the air in step 412 and transmits the RRL message to the mobile stations in step 414.
- the base station receives PreTestRes information indicating whether a reverse data rate increase is available for the next frames from the mobile stations and analyzes the PreTestRes information.
- the base station checks the current reverse channel conditions and generates an RAB according to the reverse channel conditions in step 418 and broadcasts the RAB to the mobile stations in step 420. If one RAB is set for each mobile station, the RAB may not be broadcast but must be transmitted to only the corresponding mobile station.
- FIG. 5 is a flowchart illustrating a method of generating an extended
- the base station determines whether the reverse link is currently in an overload state in step 500. In an overload state, the base station sets the extended RAB to 01 in step 512. This implies that a corresponding mobile station sets a control RAB to 01 and decreases its TX rate according to a decrease persistence test.
- the base station determines whether the current reverse link is a low load state in step 502. In a low load state, the base station sets the extended RAB to 10.
- the base station checks PreTestRes information received from mobile stations to determine whether overload will occur at the next reverse transmission in step 504. If overload is expected, the base station sets the extended RAB to 11 in step 508. If no overload is expected, the base station sets the extended RAB to 00 in step 506. The set extended RAB is broadcast or transmitted to a corresponding mobile station only.
- One RAB is assigned for each of the reverse traffic channel.
- the data rates of the reverse traffic channels are changed individually.
- One increase persistence pre-test is performed for the two reverse traffic channels.
- a decrease persistence test can be performed commonly for the reverse traffic channels or independently for each of the reverse traffic channels.
- the RRI symbol is used in the same manner as the case (1).
- the reverse data rates are increased/decreased according to the result of the common increase persistence pre-test and the RABs.
- RAB is assigned for each of the reverse traffic channels and an increase persistence pre-test is also performed independently for each of the reverse traffic channels.
- the RRI symbol is used in the same manner as the case (2).
- the two reverse traffic channels are separately controlled.
- the result(s) of the increase persistence pre-test(s) may be transmitted on a channel other than an RRI channel (e.g., a RICH) or on a new defined channel. While its transmission period is set preferably on a frame basis, it can be set in any other manner.
- RRI channel e.g., a RICH
- mobile stations determine whether a reverse data rate increase is available for the next reverse transmission and tell a base station the determination results. Then the base station carries out a planned reverse link control for the next reverse transmission. Therefore, the occurrence of an overload is prevented, reverse data loss is minimized, and the transmission efficiency of the reverse link is maximized.
Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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AU2002249632A AU2002249632B2 (en) | 2001-03-29 | 2002-03-29 | Apparatus and method of controlling reverse transmission in a mobile communication system |
JP2002578691A JP3943029B2 (en) | 2001-03-29 | 2002-03-29 | Reverse link transmission control method in mobile communication system |
BR0204497A BR0204497A (en) | 2001-03-29 | 2002-03-29 | Apparatus and method of control of reverse transmission in mobile communication system |
CA002408161A CA2408161C (en) | 2001-03-29 | 2002-03-29 | Apparatus and method of controlling reverse transmission in a mobile communication system |
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KR2001/16660 | 2001-03-29 | ||
KR20010016660A KR100800884B1 (en) | 2001-03-29 | 2001-03-29 | Transmission controlling method of reverse rink in mobile communication system |
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US (3) | US7609635B2 (en) |
EP (1) | EP1248417B1 (en) |
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KR (1) | KR100800884B1 (en) |
CN (1) | CN1214549C (en) |
AU (1) | AU2002249632B2 (en) |
BR (1) | BR0204497A (en) |
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CN1214549C (en) | 2005-08-10 |
KR100800884B1 (en) | 2008-02-04 |
EP1248417B1 (en) | 2019-05-15 |
US8717968B2 (en) | 2014-05-06 |
RU2237365C2 (en) | 2004-09-27 |
CA2408161C (en) | 2007-10-09 |
CA2408161A1 (en) | 2002-10-10 |
US20100002673A1 (en) | 2010-01-07 |
BR0204497A (en) | 2003-06-03 |
RU2002131154A (en) | 2004-03-20 |
US20020181410A1 (en) | 2002-12-05 |
AU2002249632B2 (en) | 2004-09-23 |
US20140241288A1 (en) | 2014-08-28 |
US9356728B2 (en) | 2016-05-31 |
EP1248417A3 (en) | 2005-12-28 |
JP2004528769A (en) | 2004-09-16 |
KR20020076652A (en) | 2002-10-11 |
JP3943029B2 (en) | 2007-07-11 |
EP1248417A2 (en) | 2002-10-09 |
US7609635B2 (en) | 2009-10-27 |
CN1461538A (en) | 2003-12-10 |
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