WO2000011897A2 - Adaptive dual-mode transceiver configuration - Google Patents
Adaptive dual-mode transceiver configuration Download PDFInfo
- Publication number
- WO2000011897A2 WO2000011897A2 PCT/SE1999/001347 SE9901347W WO0011897A2 WO 2000011897 A2 WO2000011897 A2 WO 2000011897A2 SE 9901347 W SE9901347 W SE 9901347W WO 0011897 A2 WO0011897 A2 WO 0011897A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mode
- transceivers
- traffic
- transceiver
- digital
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to the configuration of multi-mode transceivers in a mobile telecommunications system, and in particular to the adaptive configuration of multi-mode transceivers to maximize the amount of served traffic.
- a mobile phone To operate in this environment, a mobile phone must include circuitry for transmitting and receiving digital and/or analog communications signals.
- the mobile telecommunications system To simultaneously support both digital and analog communications and/or to support dual-mode communications, the mobile telecommunications system must include separate digital and analog transceivers at each base station. In some cases, the system operator might even want to support more than two different modes. For example, the telecommunications system could support 800 MHZ analog, 800 MHZ digital, and
- the appropriate number of each type of transceiver is determined by selecting an acceptable grade of service, which defines the probability that the selected number of transceivers will be congested at any particular time.
- the selected grade of service for each type of transceiver is typically somewhere between 2% and 5%, representing a corresponding 2% to 5% probability that the digital and/or analog side of the system will be congested.
- An additional concern with the availability of each type of transceiver can also arise because, as usage patterns change over time, additional digital or analog transceivers are often necessary.
- the mobile telecommunications system operator must provide additional digital transceivers to keep up with additional demand on the digital side of the system.
- the acquisition of these additional digital transceivers can be expensive, while the reduced demand for analog mobile service can render many of the analog transceivers unnecessary and obsolete.
- dual-mode transceivers that can operate under either an analog or a digital mode of operation can be used. These transceivers can be converted from an analog to a digital mode of operation or vice versa, or the transceivers can be converted between and among 800 MHZ analog, 800 MHZ digital, and 1900 MHZ digital modes of operation. This capability reduces the number of transceivers that must be purchased to keep up with changes in demand for mobile communication services because the transceivers can be converted from a mode of operation that has lower usage to a mode of operation having higher usage. Currently, however, the conversion of a transceiver from one mode to another requires manual reconfiguration.
- a mobile telecommunications system that automatically responds to short-term and long-term fluctuations in demand for different modes of operation and that provides for an efficient allocation of transceiver resources between multiple modes of operation.
- a system would maximize the amount of traffic served by a particular number of transceivers and would minimize the number of transceivers needed to maintain an acceptable level of served traffic.
- the present invention comprises a system and method for automatically reconfiguring a multi-mode transceiver to increase the amount of served traffic in a mobile telecommunications system.
- a multi-mode transceiver is programmable to operate in one of a plurality of modes of operation, including for supporting analog and digital traffic channels, analog and digital control channels, and location and verification devices. By adaptively configuring the transceivers in the system, the amount of served traffic can be maximized.
- an idle multi-mode transceiver operating in a first mode of operation is reconfigured to operate in a second mode of operation in response to a request to set up a communication channel requiring the second mode of operation.
- This embodiment involves reconfiguration upon seizure. Generally, the reconfiguration is performed only if no channels supporting the second mode of operation are otherwise available and if at least one other transceiver is available. In another aspect of the invention, however, even if no transceivers are currently idle, digital traffic can sometimes be repacked to clear all traffic from a particular transceiver. This repacking procedure thereby frees up a transceiver, which can be reconfigured into an alternate mode of operation.
- historical traffic patterns are used to predict future traffic demands.
- traffic data is gathered and stored in a database.
- a traffic estimator uses the stored traffic data to calculate an optional distribution of the available multi-mode transceivers between the analog and various digital modes of operation.
- the served traffic can be maximized.
- Implementation of the optimal distribution can be effectuated on a continually adjusting basis, wherein a calculated distribution from an immediately preceding data collection period is periodically implemented.
- implementation is effectuated on a time of the day and day of the week basis that involves a more detailed and extensive data storage and calculation procedure.
- the historical traffic pattern configuration is combined with the reconfiguration at seizure method.
- the transceivers are initially configured based on historical traffic patterns. Modification of the initial configuration through reconfiguration at seizure is permitted to account for unexpected peaks or for inaccuracies in the expected traffic estimates.
- reconfiguration of transceivers to provide additional control channels or verification devices is also permitted to account for increased demands on control and verification channels.
- FIGURE 1 is a block diagram of a dual-mode mobile telecommunications system for implementing reconfiguration of transceivers upon seizure in accordance with the present invention
- FIGURE 2 is a flow diagram of a method for reconfiguring a transceiver at seizure responsive to an analog-only mobile station in accordance with the present invention
- FIGURE 3 is a diagram of a base station having a plurality of selectively reconfigurable dual-mode transceivers in accordance with the present invention
- FIGURE 4 is a flow diagram of a method for reconfiguring a dual-mode transceiver at seizure responsive to an analog-preferred mobile station in accordance with the present invention
- FIGURE 5 is a flow diagram of a method for reconfiguring a transceiver at seizure responsive to either a digital-only or a digital-preferred mobile station in accordance with the present invention.
- FIGURE 6 is a block diagram of a mobile telecommunications system for reconfiguring transceivers based on historical traffic patterns in accordance with the present invention.
- FIGURE 1 there is illustrated a dual-mode mobile telecommunications system 10.
- the system
- MSCs mobile switching centers
- telecommunications trunks 22 a plurality of mobile switching centers (MSCs) 20 that are interconnected by telecommunications trunks 22. Although only three MSCs 20 are shown, it will be understood that the mobile telecommunications system 10 typically includes a much larger number of MSCs 20. At least one of the MSCs 20 is connected to a public switched telephone network (PSTN) 12 via a telephone line 24. Each MSC 20 is further connected to a plurality of base stations (BSs) 30 by lines 26.
- PSTN public switched telephone network
- BSs base stations
- the base stations 30 in the dual-mode telecommunications system 10 include a plurality of multi-mode capable transceivers 34 (see FIGURE 3), some of which are configured to operate in a digital mode while others are configured to operate in an analog mode of operation.
- the use of both types of transceivers permits customers to access the system 10 using either an analog or digital mobile phone 40 or using a dual- mode mobile phone 40.
- Traffic signals between the transceivers and the mobile phones 40 are carried via radio links 32.
- each analog transceiver is capable of transmitting and receiving one channel of analog telecommunications traffic signals.
- EachD-AMPS digital transceiver (i.e., in systems operatingundertheIS-136 protocol) is capable of transmitting and receiving three channels of digital telecommunications traffic signals by dividing the channel into three time slots, and each GSM digital transceiver is capable of transmitting and receiving eight channels of digital telecommunications traffic signals by dividing the channel into eight time slots.
- one or more of the transceivers can also be configured to operate as an analog control channel, a digital control channel, or a location and verification module (LVM).
- Analog and digital control channels are used to send control messages, such as mobile pages, call set-up requests, registration messages, handover requests, and other non-traffic information, between the base stations 30 and the mobile phones 40.
- An LVM is used to verify location data received from the mobile station 40 for performing mobile-assisted handover.
- the mobile station 40 periodically transmits data relating to the received signal strength of signals from base stations 30 in neighboring cells. If, based on this data, it is determined that signals from the neighboring cell are stronger than those from the current cell, a handover to a neighboring cell is normally appropriate.
- an LVM is used to verify the approximate location of the mobile station 40 by attempting to detect uplink signals transmitted by the mobile station 40. If the location is confirmed, then the handover procedure is allowed to proceed.
- an idle transceiver can be automatically reconfigured upon seizure of the transceiver device. This reconfiguration can be accomplished by loading a different type of modulation and control software at the base station 30 and at the MSC 20. To change from analog to digital, for example, requires a digital signal processing software change. If a particular type of channel is requested but none are available, the system
- the system 10 will attempt to select an idle transceiver and, if one is available, will reconfigure it to operate according to the requested type of channel. For example, if a mobile station 40 requests an 800 MHZ D-AMPS digital voice channel but no 800 MHZ D- AMPS time slots are available, the system 10 will attempt to locate an idle analog channel or another type of idle digital channel, such as a 1900 MHZ digital channel. This search for an idle analog channel can include searching among the transceivers in the same base station 30, the same cell, or even in other neighboring cells. If an idle analog channel is available, the system 10 will reconfigure it to operate as three digital voice channels. One of these digital voice channels can then be used by the requesting mobile station 40.
- This procedure can similarly be performed to reconfigure an idle channel of any type (e.g., analog voice channel, 1900 MHZ D-AMPS digital channel, GSM digital channel, etc.) to any type of requested channel. Furthermore, the procedure is applicable regardless of whether the request to set-up a communication channel is initiated by the mobile station 40, is initiated by the MSC 20, the PSTN 12, or another mobile station 40, or is the result of an attempted handover.
- any type e.g., analog voice channel, 1900 MHZ D-AMPS digital channel, GSM digital channel, etc.
- FIGURE 2 wherein there is shown a flow diagram of a method 100 for reconfiguring a transceiver at seizure responsive to an analog-only mobile station (MS) 40.
- the method 100 is initiated by an analog-only mobile station 40 attempting to access the mobile telecommunications system 10 at step 102.
- step 106 it is determined if an idle digital configured transceiver is available.
- the digital configured transceiver is reconfigured to operate as an analog traffic channel at step 110, and a call is set up over the available analog traffic channel at step 116. If there are no idle digital configured transceivers, it is next determined at step 108 if there are at least three idle digital time slots available in the base station. If not, then reconfiguration is not possible because the system 10 is congested, and the attempted access is denied at step 114. However, if at least three digital time slots are available in the cell, then the digital configured connections can be rearranged so as to clear all traffic from one of the digital configured transceivers at step 112. This repacking process is discussed in greater detail below in connection with the multiple transceivers shown in FIGURE 3. The cleared digital configured transceiver is then reconfigured to operate in the analog mode at step 110, and a call is set up over the available analog traffic channel at step 116.
- the base station 30 includes a plurality of multi-mode transceivers 34 for transmitting signals to and receiving signals from mobile stations 40 in the mobile telecommunication system 10.
- Each of the transceivers 34 is connected to an antenna 38 via a wire 39.
- the transceivers 34 are illustrated as being attached to a single antenna, it is also possible to attach the transceivers to separate antennas 38. As illustrated in FIGURE 3, three of the transceivers 34(1),
- each of these transceivers 34(1), 34(2), & 34(4) include three digital telecommunications channels 35.
- two of the digital channels 35 are in use and one digital channel 35 is idle for each of the digital transceivers 34( 1 ), 34(2), & 34(4).
- the remaining transceiver 34(3) is operating in the analog mode.
- this analog configured transceiver 34(3) has only a single analog telecommunications channel 36.
- all of the channels for one digital configured transceiver 34(2) will then be idle, and the digital configured transceiver 34(2) can be reconfigured to operate as an analog configured transceiver 34 or other type of transceiver, thereby providing an additional analog traffic channel, digital traffic channel, or control channel and permitting greater utilization of the available resources.
- a digital channel having three time slots is used as an example, it will be understood that any channel having multiple slots can be repacked to provide an idle transceiver for reconfiguration.
- a GSM configured transceiver can be repacked and reconfigured to have another mode of operation.
- FIGURE 4 there is shown a flow diagram of a method 200 for reconfiguring a transceiver at seizure responsive to an analog-preferred mobile station (MS) 40.
- the method 200 is initiated by an analog-preferred mobile station 40 attempting to access the mobile telecommunications system 10 at step 202.
- An analog-preferred mobile station 40 is a dual-mode device that will select an analog channel if it is available.
- it is determined if any analog traffic channels are available. If at least one analog configured transceiver 34 is available, then no reconfiguration is necessary, and an analog call connection is set up at step 220. If no analog configured transceivers 34 are available, the system 10 attempts to reconfigure an idle digital configured device to provide an additional analog traffic channel.
- step 206 it is determined if an idle digital configured transceiver 34 (FIGURE 3) is available. Idle in this connection means that all three of its digital channels are available. If so, the digital configured transceiver is reconfigured to operate in the analog mode at step 214, and an analog call connection is set up at step 220. If there are no idle digital configured transceivers it is next determined at step 206
- step 208 if there are at least three idle digital time slots available in the base station (or eight idle time slots in the case of a GSM system). If so, the connections over the digital channels are repacked at step 216, as discussed above in connection with FIGURE 3 by transferring these connections to idle channels for other digital configured transceivers.
- the cleared digital configured transceiver 34 is reconfigured to operate in the analog mode at step 214, and an analog call connection is set up at step 220. If it is determined at step 208, however, that there are not at least three idle digital time slots (or eight idle time slots in the case of a GSM system), the system 10 is too congested to provide analog service.
- the mobile phone 40 is a dual- mode phone (i.e., it is capable of digital operation), however, it might still be possible to set up a digital call connection. Therefore, at step 210, it is determined if any digital time slots are available. If so, then a digital call connection is set up at step 218. If no digital time slots are available, the system 10 is completely congested on both the analog and digital sides, and the attempted access is denied at step 212.
- FIGURE 5 there is shown a flow diagram of a method 300 for reconfiguring a transceiver at seizure responsive to either a digital-only or digital- preferred mobile station (MS) 40.
- the digital mobile station 40 attempts to access the mobile telecommunications system 10.
- reconfiguration is controlled by the MSC 20 and is dependent upon the receipt of a request to set-up communications over a particular type of channel that is currently not available.
- a request to set-up communications over a particular type of traffic channel is transmitted by the mobile station 40 over a control channel and received by the MSC
- the MSC 20 For incoming calls, it is possible to store the preferred mode of operation for the mobile station 40 at the MSC 20 or elsewhere in the system 10, so that the MSC 20 generates the necessary channel assignment without having to query the mobile station 40. Requests for additional control channels or verification channels, on the other hand, are normally generated by the MSC 20 itself based on increased demand for control or verification channels. Then, to reconfigure a selected transceiver, the MSC 20 initiates loading of a different type of modulation and control software at the base station 30 and at the MSC 20.
- each transceiver remains in its last configuration until another reconfiguration command is received.
- the transceiver will remain in the analog configuration even after the call connection terminates.
- the analog configured transceiver will change back to the digital mode only if a reconfiguration command is later received to switch the transceiver into the digital configuration.
- the transceivers for a particular base station 30 or cell will tend to stabilize at or near an optimal distribution between digital and analog modes of operation and further will dynamically respond to changes in traffic patterns. Once the system stabilizes, a reduced amount of time and processing resources are expended on reloading software in the MSC 20 and the base station 30 to reconfigure the transceivers.
- reconfiguration is only performed when a requested mode of operation is completely saturated (i.e., at 100% of capacity). In some cases, however, especially where a verification device or digital control channel (DCCH) becomes highly loaded, it is often desirable to trigger the reconfiguration before the point of saturation is reached to avoid denying access to the system 10 or losing verification or control data.
- DCCH digital control channel
- the system 10 reconfigures either an analog or a digital configured transceiver to operate as a second DCCH, a second verification device, or some other mode of operation.
- the reconfiguration is triggered once a predetermined traffic threshold is reached - 90% of capacity, for instance.
- the threshold parameter for the DCCH can be measured by the number of mobile requests and acknowledges (uplink signals) and the number of system requests or acknowledges (downlink signals).
- uplink signals uplink signals
- downlink signals downlink signals
- an idle transceiver is reconfigured to a DCCH.
- LVM if the number of system requests exceeds a predefined threshold, the system automatically reconfigures an idle digital or analog transceiver as an LVM.
- the transceiver will generally remain in that configuration until the load on the LVM or DCCH falls below some threshold. At that point, the transceiver is reconfigured to an analog or digital traffic mode.
- the threshold for converting back to a traffic channel is lower than the threshold for the initial conversion to a second DCCH or second LVM.
- a transceiver might be reconfigured to a LVM or DCCH at 90% of capacity, but will not go back to a digital or analog traffic mode until the load falls below 70% of the capacity of one transceiver.
- the likelihood of rapid oscillations can further be reduced by averaging the LVM or DCCH traffic during a window of five to ten seconds, for instance, rather than reconfiguring based upon instantaneous load levels.
- the transceivers are periodically reconfigured based on historical traffic patterns.
- the distribution of available transceivers between digital and analog configurations is calculated to maximize the amount of served traffic, thereby maximizing revenue system utilization, and presumably customer satisfaction.
- FIGURE 6 there is illustrated a mobile telecommunications system 14 for reconfiguring transceivers based on historical traffic patterns.
- each base station 30 reports event data to the MSC 20 (as generally indicated at 52).
- This event data generally comprises traffic statistical data, such as a time stamp for each call connection and a length of each call.
- the MSC 20 in turn sends the event data to a traffic estimator 50 (as generally indicated at 53).
- the traffic estimator 50 stores this data in a database 56 and uses the stored data to calculate optimal transceiver configurations on a per call basis. Based on the calculations performed by the traffic estimator 50, reconfiguration commands are periodically sent to the MSC 20 (as generally indicated at 54). These commands are then forwarded to the appropriate base stations 30 (as generally indicated at 55), where transceivers are reconfigured according to the received commands. In some cases, prior to sending out reconfiguration commands, operator approval or confirmation might be required. This confirmation can be obtained via a user interface 60.
- the user interface 60 can also be used to notify the operator if preselected blocking thresholds are exceeded, thereby providing notice to the operator that additional transceivers are necessary, or to simply inform the operator of traffic estimates and recommendations for numbers of devices, separate and apart from the implementation of reconfiguration processes.
- the amount of offered traffic measured in erlangs is needed for each modulation mode (i.e., 800 MHZ digital, 1900 MHZ digital and/or analog).
- the estimated offered traffic (Off. Traff.) in a particular cell for a specific modulation mode is equal to the mean holding time (MHT) of calls in that cell that use the specific modulation mode times the number (n) of attempted accesses per second for that modulation mode.
- MHT mean holding time
- Off. Traff. MHT * n
- the mean holding time is the average time that a mobile call connection lasts in the particular cell for the specific modulation mode after being successfully designated on voice channel. Generally, the mean holding time does not take into account dropped calls. "Attempted accesses" refers to any attempt to originate, terminate, or handover a call involving a mobile station 40. Each of these values can be derived from data stored in the traffic database 56.
- the optimal configuration distribution can be determined by calculating the total expected served traffic for various possible configurations.
- the expected served traffic (T e ) is calculated for each modulation mode for a selected number of channels (N ch ) by subtracting from the estimated offered traffic (Off. Traff.) the probability (p) that blocking will occur for the estimated offered traffic and the given number of channels times the estimated offered traffic (Off. Traff). Accordingly,
- T e Off. Traff. - (p*Off. Traff.)
- the expected served traffic for each modulation mode can then be added together to obtain a total expected served traffic.
- the probability that blocking will occur is typically determined in a cellular system using an Erlang B table to model subscriber behavior. As will be appreciated by those skilled in the art, however, any appropriate probability function can be used including Poisson or Erlang C distributions, depending upon the system parameters.
- the served traffic calculation it is assumed that there are 10 transceivers in a cell and that the offered traffic estimate for the cell is calculated to be 5 erlang of analog traffic and 3 erlang of digital traffic. If it is first assumed that the system is configured to have 6 analog transceivers (6 analog channels) and 4 D-AMPS digital transceivers (12 digital channels), the served analog traffic is expected to be approximately 4.0 erlang calculated using a B-erlang table and the expected served digital traffic is about 3.0, for a total expected served traffic of about 7.0 erlangs. Next, the expected served traffic is calculated for 7 analog and 3 digital transceivers
- the expected served traffic is approximately 4.25 for analog and 3.0 for digital, giving a total of 7.25 erlangs. Thus, a larger amount of traffic is expected to be served by the 7/3 distribution than the 6/4 distribution. For an 8 analog and 2 digital transceiver configuration, the expected served traffic is approximately 4.6 for analog and 2.9 for digital, for a total of about
- the 8/2 distribution is expected to serve about 7.5 erlangs of the estimated 8 erlangs of total offered traffic. Additional calculations would normally be carried out for each possible distribution. However, in this example, the 8/2 distribution turns out to be the optimal configuration and would therefore be expected to generate the highest amount of revenue.
- the traffic estimator would generate a command to configure 8 of the 10 transceivers as analog and the remaining 2 as digital.
- the frequency of reconfigurations based on historical traffic patterns can be selected by the system operator depending on the desired resolution of the reconfigurations. Preferably, the resolution is between five minutes and one week, although other periods can also be used.
- traffic pattern data is collected during an evaluation window. The collected data is used to calculate a preferred configuration, which is applied during an application window. While the application window is running, a subsequent evaluation window can be performed. The evaluation window and the application window can be for the same length of time or for different time periods and can be concurrent or offset from one another. As an example, the evaluation window in a particular system might be a 15 minute period followed by a five minute idle period, so that the evaluation window repeats at 20 minute intervals.
- the application window in this example could coincide with the 20 minute interval, during which a preferred configuration from a previous evaluation window is applied. Changes in demand would thereby be substantially accounted for within 20 minutes. More or less frequent reconfigurations can be used depending primarily upon the expected rate of traffic pattern changes.
- the preferred configuration can be determined based on the time and the day of the week. Because call data is stored in the database 56, it is possible to calculate the appropriate distribution of analog and digital transceivers using stored data for traffic patterns exhibited during corresponding historical periods. Generally, traffic patterns on weekdays will differ significantly from night or weekend traffic. Therefore, the configuration can be tailored to the historical demand for analog and digital traffic channels. For example, based on expected served traffic calculations, the system 14 might be programmed to have a 50% analog and 50% digital distribution on a Monday morning between 9:00 a.m. and
- the preferred distribution might be 70% analog and 30% digital.
- the resolution of the reconfigurations can be as small as five minutes or as large as 24 hours in a preferred embodiment. It should also be noted that the distribution can often vary depending on the location of the cell. A cell that is near a major highway, for instance, may exhibit different traffic patterns than a cell in an urban area.
- reconfiguration at seizure can also be utilized in connection with the historical traffic pattern configuration embodiment.
- reconfiguration at seizure can be applied to handle unexpected peaks in traffic.
- such a reconfiguration at seizure is conditioned on a determination that the other modulation mode is below a certain percentage of the expected offered traffic according to the traffic estimator calculation. In this situation, for example, at a given time there might not be any digital channels available.
- the system 14 Prior to reconfiguring an idle analog transceiver, however, the system 14 would be required to determine if the analog traffic is below 80%, for instance, of its expected value.
- reconfigured transceivers are returned to the state recommended by the traffic estimator in the mixed method.
- the number of requests for reconfiguration at seizure can be used to provide an error estimate for the historical traffic pattern configuration.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU57671/99A AU754721B2 (en) | 1998-08-21 | 1999-08-06 | Adaptive dual-mode transceiver configuration |
CA002340893A CA2340893C (en) | 1998-08-21 | 1999-08-06 | Adaptive dual-mode transceiver configuration |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13844098A | 1998-08-21 | 1998-08-21 | |
US09/138,440 | 1998-08-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000011897A2 true WO2000011897A2 (en) | 2000-03-02 |
WO2000011897A3 WO2000011897A3 (en) | 2000-06-02 |
Family
ID=22482025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1999/001347 WO2000011897A2 (en) | 1998-08-21 | 1999-08-06 | Adaptive dual-mode transceiver configuration |
Country Status (4)
Country | Link |
---|---|
AR (1) | AR020239A1 (en) |
AU (1) | AU754721B2 (en) |
CA (1) | CA2340893C (en) |
WO (1) | WO2000011897A2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994005130A1 (en) * | 1992-08-11 | 1994-03-03 | Telefonaktiebolaget Lm Ericsson | Rearranging channels |
US5343513A (en) * | 1992-04-20 | 1994-08-30 | Hughes Aircraft Company | Channel compression and dynamic repartitioning for dual mode cellular radio |
WO1997014261A1 (en) * | 1995-10-13 | 1997-04-17 | Telefonaktiebolaget Lm Ericsson (Publ) | A system and method for hyperband cell interoperability in a cellular telecommunications network |
-
1999
- 1999-08-06 WO PCT/SE1999/001347 patent/WO2000011897A2/en active IP Right Grant
- 1999-08-06 CA CA002340893A patent/CA2340893C/en not_active Expired - Fee Related
- 1999-08-06 AU AU57671/99A patent/AU754721B2/en not_active Ceased
- 1999-08-20 AR ARP990104197 patent/AR020239A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5343513A (en) * | 1992-04-20 | 1994-08-30 | Hughes Aircraft Company | Channel compression and dynamic repartitioning for dual mode cellular radio |
WO1994005130A1 (en) * | 1992-08-11 | 1994-03-03 | Telefonaktiebolaget Lm Ericsson | Rearranging channels |
WO1997014261A1 (en) * | 1995-10-13 | 1997-04-17 | Telefonaktiebolaget Lm Ericsson (Publ) | A system and method for hyperband cell interoperability in a cellular telecommunications network |
Also Published As
Publication number | Publication date |
---|---|
AU754721B2 (en) | 2002-11-21 |
CA2340893A1 (en) | 2000-03-02 |
WO2000011897A3 (en) | 2000-06-02 |
AU5767199A (en) | 2000-03-14 |
CA2340893C (en) | 2008-04-15 |
AR020239A1 (en) | 2002-05-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101584233B (en) | Dynamic frequency band allocation between radio communication networks | |
US5557657A (en) | Handoff between overlay and underlay cells | |
US9351215B2 (en) | Terminal handover | |
US6014564A (en) | Method and apparatus for determining virtual cell area | |
EP1386511B1 (en) | Method and network element for controlling handover | |
US7177649B1 (en) | System for load balancing based on class of service for wireless communication networks | |
JP3112173B2 (en) | Call admission control method and mobile station device for CDMA mobile communication system | |
US6745049B1 (en) | Mobile communication system | |
JP2001507536A (en) | Cellular radio system and interference level measurement method | |
US7894813B2 (en) | Method and apparatus for utilizing historical network information for mitigating excessive network updates when selecting a communications channel | |
EP1188253B1 (en) | Method and apparatus for assigning a mobile station to a communication resource | |
GB2316578A (en) | Control system for cellular network | |
US6198918B1 (en) | Intelligent cell recovery | |
CA2340893C (en) | Adaptive dual-mode transceiver configuration | |
EP1042938B1 (en) | Procedure and system for position management in a mobile telephone system | |
JP2002500847A (en) | Method for handing over a call between two cells of a digital cellular mobile radio network | |
WO2000051384A1 (en) | A communication system and method therefor | |
US6973303B1 (en) | Method for improving reception of messages in a communication network | |
US20040009765A1 (en) | Channel reservation in a location area | |
JPH0984105A (en) | Method and device for controlling call reception of mobile communication | |
EP1061760A1 (en) | Method and system for channel allocation |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
AK | Designated states |
Kind code of ref document: A3 Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
ENP | Entry into the national phase in: |
Ref country code: CA Ref document number: 2340893 Kind code of ref document: A Format of ref document f/p: F Ref document number: 2340893 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 57671/99 Country of ref document: AU |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
122 | Ep: pct application non-entry in european phase | ||
WWG | Wipo information: grant in national office |
Ref document number: 57671/99 Country of ref document: AU |