CN1319316A - Cell load sharing in mobile-controlled cell selection environment - Google Patents
Cell load sharing in mobile-controlled cell selection environment Download PDFInfo
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- CN1319316A CN1319316A CN 99811174 CN99811174A CN1319316A CN 1319316 A CN1319316 A CN 1319316A CN 99811174 CN99811174 CN 99811174 CN 99811174 A CN99811174 A CN 99811174A CN 1319316 A CN1319316 A CN 1319316A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
A method and system are disclosed for implementing cell load sharing in a mobile-controlled cell selection environment, such as, for example, in a radio packet data system (100), wherein dynamic system information (e.g., SI messages) is used to enable a mobile station to ''perceive'' cell borders (108) that depend on the system load. Essentially, cell selection parameters in the system information messages are associated with the distribution of the load invarious cells (BTSA, BTSB). In this way, the mobile stations (116, 118) (which are responsible for their own cell selection) in overloaded cells (BTSB) can be prompted to select alternative, less loaded cells (BTSA).
Description
Background of invention
The invention technical field
The present invention relates generally to field of wireless telecommunications, particularly, the present invention relates to that (such as in wireless packet data systems) enables to implement the method and system that cell load is shared under the cell selecting environment of travelling carriage control.
Description of Related Art
In new generation wireless data communication service,, packet is transmitted between base station transceiver (BTS) and travelling carriage (MS) by wireless air interface such as the GPRS (GRPS) in global system for mobile communications (GSM).This wireless system uses known honeycomb (for example, as in GSM), and wherein each BTS is assigned with and covers certain geographic service area (sub-district).Like this, each BTS is responsible for communicating by letter with all MS that move in its sub-district.Typically (but not always), and BTS (for example, BTS A) sub-district comprises the geographic area, in all BTS of system, and this BTS radio link quality that in this geographic area, offers the best.Wherein the border of MS change communication from BTS A to BTS B is called the cell boarder sub-district A and the sub-district B.
In the cellular data communication system, the business load that is produced by user (MS) changes at any time.This true expression wireless network need be made into excessive size in order to compensate traffic peak.In any given time, existing load is too high and suitable service quality can not be provided for the MS in these sub-districts in some sub-district usually, and simultaneously, adjacent sub-district can have superfluous capacity.In this case, it is favourable allow some MS in congested sub-district to be connected to just standing sub-district less load, adjacent.This method is commonly referred to " cell load share ", can be used in traditional cellular voice communication system (for example, GSM).
In fact, in cellular wireless system, there are two kinds of methods to supervise cell selecting: the cell selecting of MS control and the cell selecting of network control.For the cell selecting of MS control, determine the most suitable responsibility which BTS is MS that is connected to.Like this, and its acquired any information of MS consideration (radio condition, received signal intensity, volume of business, and possibly, additional information in system information or the like), as the input that is added to predetermined cell selecting algorithm.The sub-district that MS should be connected to is represented in the output of cell selecting algorithm.
For the cell selecting of network control, networking command MS is connected to certain BTS (sub-district).Condition for necessity of the cell selecting of network control is that each MS constantly provides measurement report to network.In fact, this measurement report informing network, how the MS of report is according to their signal strength signal intensity and radio link quality perception candidate's BTS or sub-district.
These two kinds of cell selecting methods have merits and demerits separately.For example, the major advantage of the cell selecting of network control (being also referred to as " location ") is, can use the relatively cell selecting algorithm of intelligence.Like this, information resources that it has, operational that network can use singly are not radio link conditions, be also included within load in each sub-district, data in buffer grouping, with the quality of user's business relations, best local zone or the like.The cell selecting of network control for example, is used among the Circuit-switched GSM.
The disadvantage of the cell selecting of network control is the complexity for the increase of involved network, and each MS must provide measurement report to network termly.Unfortunately, this measurement report uses uplink bandwidth, so, in fact reduced the capacity of system.The complexity that increases is because network must be supervised the finder for the MS of each work.
On the other hand, for the cell selecting of MS control, each MS is responsible for its cell selecting program.In the GPRS configuration, system can use MS cell selecting control or network control.Yet, since the reason that describes below, more most ground, and the cell selecting of MS control will be the method that the GPRS network in most of future is selected.
Relevant prior art concentrates on sub-district load Sharing in the system of the cell selecting method that uses network control.In such system, the MS of work always reselects (that is, " handover ") order starting by the sub-district that network sends so as to the method for selecting another sub-district.Share method by using such cell load, in congestion period, network can be identified in the MS of the candidate in the congested sub-district, and by sending for dedicated cell (promptly, not too congested sub-district) reselect order, guide these MS to be connected to not too congested sub-district.Like this, which MS moves on to another sub-district, or where or when to move their details, is actually the problem of enforcement.
The major defect of the method that the cell load of above-mentioned prior art is shared is that they can not be used in the system of the cell selecting with MS control.Therefore, can use therein network control or MS control cell selecting, such as in the such system of GPRS, the prior art cell load is shared method and can not partly be used in conjunction with the cell selecting of the MS control of those systems.Exist this shortcoming to be because network does not have the information (not having measurement report to send to network) about each radio environment of each MS.And in the system of the cell selecting with strict MS control, the decision of the new sub-district that makes one's options is the responsibility of MS, rather than the responsibility of network.On the other hand, this MS does not know the length of lining up about in total load situation, current congestion level or the system.Therefore, it is shared that MS itself can not supervise cell load.
In addition, this shortcoming has applied strict restriction in the double mode cell selection system such such as GPRS.Yet because this shortcoming of the cell selecting method of previously described network control, the cell selecting scheme of MS control still is the method for selecting in most of GPRS network mostly.
Brief summary of the invention
According to most preferred embodiment of the present invention, provide under the cell selecting environment of MS control, such as in wireless packet data systems, be used to implement the method and system that cell load is shared, wherein dynamic system information (for example, SI message) is used to make MS can perception to depend on the cell boarder of system load.In fact, the cell selecting parameter in this system information is relevant with the distribution of load in each sub-district.Like this, the MS (they are responsible for their cell selecting) in the sub-district of overload can be promoted selection another, the sub-district of less load.
An important techniques advantage of the present invention is, the method for using cell load to share in a kind of system of the cell selecting of also using MS control therein is provided.
Another important techniques advantage of the present invention is, it makes the system of the cell selecting that only has MS control also can use cell load to share.
Another important techniques advantage of the present invention is, in the system that can between cell selecting pattern network control and MS control, select (for example, GPRS) in, when system is just operating in the cell selecting pattern of MS control, can use cell load to share.
Another important techniques advantage of the present invention is, it makes (for example, can share by working load in GPRS), come the increase capacity and avoid congested, and do not cause the up link overload because of the measurement report business at wireless packet data systems.
The accompanying drawing summary
When in conjunction with the accompanying drawings with reference to following detailed description, can more fully understand method and apparatus of the present invention, wherein:
Fig. 1 shows the figure that can be used for implementing example system of the present invention;
Fig. 2 shows further example system shown in Figure 1 is how to be used for implementing figure's of the present invention; And
Fig. 3 is that display system information message is how to be used for implementing most preferred embodiment of the present invention.
Accompanying drawing describes in detail
Can understand most preferred embodiment of the present invention and its advantage best by reference Fig. 1-3, identical numeral is used in the identical and corresponding part of each accompanying drawing.
In fact, according to most preferred embodiment of the present invention, the method and system that is used for sharing cell load in wireless packet data systems is provided, and wherein the dynamic system information form of SI message (for example, with) is used for making MS can perception to depend on the cell boarder of system load.For the cell selecting of MS control, network is determined cell boarder by relevant cell selecting parameter is included in the system information.System information can be broadcast to MS all in the network, or is sent to the group of the one or more MS that select in the sub-district of overload specially.The cell selecting parameter comprises the information about the skew that can be applied to measured signal strengths, threshold value, sub-district priority or the like.For GPRS, such cell selecting parameter can find among the version 6.0.0 at GSM technical specification GSM 05.08.Like this, exemplary embodiment hereto, the cell selecting parameter in system information is relevant with the distribution of load in each sub-district.Like this, the MS in overloaded cells (they are responsible for their cell selecting) can be pushed and select sub-district that replace, less load.As mentioned above, system information can be sent out on broadcast channel, or be sent to specially the overload the sub-district in select subclass.
Particularly, Fig. 1 shows the figure that can be used for implementing example system 100 of the present invention.System 100 preferably adopts the system of the cell selecting of MS control, and can be wireless packet data systems or packet switching system, such as GPRS.The wireless packet data systems 100 of example can move by the combined circuit switching system, and such as GSM, numeral-Advanced Mobile Phone System (D-AMPS) maybe can be supported wireless packet data systems or any other professional system.System 100 comprises a plurality of base stations or BTS, such as BTS A (102) and adjacent BTSB (104).BTS A defines a sub-district (A), and a BTS B definition sub-district (B).The sub-district background of dotted line 106 representatives between sub-district A and sub-district B wherein awared signal strength signal intensity (that is SS, that (to portable terminal or MS) signal strength signal intensity of sub-district A equals sub-district B
A=SS
B).For GSM and similar system, can suppose the function of two the BTS A 102 of base station controller (BSC) shown in being connected to and B 104 and these two BTS of control.
For relatively low business load situation, (for example be comprised in the portable terminal 110-118 system information shown in broadcasting or sending to, SI message in GSM and GPRS) the cell selecting parameter in, the skew of regulation 2dB, it be added to that MS measures, from signal strength signal intensity (that is SS, of BTSA102
A+ 2dB=SS
B), so that form (solid line) cell boarder 108.Shown as this example scenario, three portable terminals (110,112,114) are connected to BTS A 102 at the beginning, and two portable terminals (116,118) are connected to BTS B104.
The demonstration of Fig. 2 is similar to Fig. 1, and except in the situation shown in Fig. 2, the portable terminal that is connected to BTSB 104 is more than the portable terminal that is connected to BTS A 102.For example, three portable terminals (110,112,114) are connected to BTS A 102, and seven portable terminals (116-128) are connected to BTS B 104.Like this, situation can be supposed hereto, and the load among the B of sub-district is to make that no longer including enough quality of services (for example, the QoS among the GPRS) offers the block data system user among the B of sub-district.Yet, can suppose in adjacent sub-district A, have Radio Resource more than sufficient can be provided for suitable business simultaneously.
Fig. 3 is that display system information message is how to be used for implementing most preferred embodiment of the present invention.For situation shown in Figure 3, the network transmitting system informational message of system 100 (by BSC and one or more BTS A and B), they comprise suitable sub-district parameter, and the portable terminal that works like this is added to the skew of 4dB signal strength signal intensity (that is SS, of the perception of sub-district B
A+ 4dB=SS
B).In fact, because skew, for affected portable terminal, the cell boarder between sub-district A and B appears to move to sub-district B, and thus, sub-district A is in fact compared with the more substantial portable terminal of former covering.For example, because the 4dB that receives in system information skew, five portable terminals (110-118) appear to be covered by sub-district A now, and as if five portable terminals (120-128) are covered by sub-district B now in addition.
An example that can be used for above-mentioned skew is sent to the system information of one or more portable terminals under the cell selecting environment of MS control is GPRS cell selecting parameter information units, as at GSM technical specification GSM 04.60, stipulate in the 11.2.19 of version 6.0.0 (in June, the 1998) joint.Information unit can be on the Packet Broadcast Control CHannel among the A of sub-district (PBCCH), or on the control channel (PACCH) that one or more groupings are relevant in the A of sub-district, is sent to all portable terminals in the A of sub-district or a subclass of portable terminal.For each sub-district that is defined as the sub-district adjacent with sub-district A, information unit can comprise 5 bit information unit GPRS_RESELECT_OFFSET, it is defined in the skew that will be used in " C31/C32 " criterion, or deviation, this criterion is to be used in the GPRS that reselects for the sub-district of MS control.This skew or deviate can be different for different sub-districts, therefore, can be used for moving the border in the MS perception of (for example, between A and the B) between two sub-districts.For example, for the portable terminal that resides among the A of sub-district, by in above-mentioned system information elements, be provided with five corresponding bits for " 01100 " (+4dB), can be added to the deviant of 4dB the ranking criterion of sub-district B, C32.When system information elements is sent out on broadcast channel in the A of sub-district (or when in the A of sub-district, on one or more modification control channels, being sent out), the cell boarder (in this example 108) of portable terminal perception between sub-district C and sub-district B that receives, as with respect to etc. the mobile 4dB in signal strength signal intensity border (106).For fear of wherein selecting the portable terminal of sub-district B to turn back to a kind of situation of sub-district A immediately from sub-district A, the corresponding system information unit (promptly in the B of sub-district, be controlled at the unit of the cell boarder between sub-district A and the sub-district B, as what see from sub-district B) can be set up thereupon.
Can be used for carrying another example of the system information of above-mentioned skew in not using the GSM/GPRS system of PBCCH, to find.In such system, the cell selecting of GSM mobile termination and the MS control that is operated in GPRS portable terminal in any pattern in idle pulley, can use GSM SI message cell selecting parameter information unit, as at GSM technical specification GSM 04.08, stipulate in the 10.5.2.34 of version 6.1.1 (in August, the 1998) joint.SI 3 all the other eight hytes (Rest Octets) information units are type 5 information units that comprise " CELL_RESELECT_OFFSET " information area.CELL_RESELECT_OFFSET is included in the so-called interior deviant (in dB) of " C2 " criterion that is used for the sub-district.This skew or deviate can be different for different sub-districts, therefore can be used for moving border (for example between A and the B), the MS perception between two sub-districts.For example, the CELL_RESELECT_OFFSET deviant of 4dB can be by being sent in the corresponding bit pattern in the CELL_RESELECT_OFFSET information unit among the system information 3 Rest Octets (all the other eight hytes) that send among the A of sub-district on the BCCH channel, and be added in the C2 criterion for sub-district A as skew.Yet, this example scenario supposition, the CELL_RESELECT_OFFSET district among system information 3 RestOctets that send on the BCCH channel in the B of sub-district (all the other eight hytes) is corresponding to skew or the deviation of OdB among the B of sub-district.
Therefore, in two above examples, according to the preferred embodiments of the present invention, the skew that causes by the sub-district parameter in the system information that sends make in the B of sub-district, near the portable terminal (for example, portable terminal 116 and 118) on the border of sub-district A sub-district A ranking for compared with better sub-district of being connected of sub-district B.So these two portable terminals (for example, by traditional handoff procedures process) are implemented the change from sub-district B to sub-district A.The result is, load (mobile terminal service) moves to sub-district A from sub-district B, so that can provide enough traffic carrying capacity to user's (as shown in Figure 3) in sub-district A and sub-district B.If the load in sub-district A and/or sub-district B changes, then the sub-district parameter in the system information can be changed, and skew is changed thereupon, so that the change of compensating load.By so dynamically content of using system informational message, the removable adjacent cell boarder of network is so that the change that regulating load distributes.Like this, the present invention has improved the ability of the cellular system traffic carrying capacity that maintenance is enough during the local congestion in network.
Therefore, in accordance with the teachings of the present invention, multiple loading condition is arranged, can trigger the change of the system information that sends, cause the moving of cell boarder of MS perception.For example, relevant load can relate to user's total in (1) sub-district number, (2) user's of total work number in the sub-district, (3) ratio of channel number in the user's of total work number and the sub-district in the sub-district, (4) ratio of channel number in the sum of the packet of lining up in the sub-district and the sub-district, (5) measured value of available QoS in the sub-district (for example, each user's bandwidth, can finish, for the part of user's QoS agreement) or the like.And the cell boarder that can cause moves the border that is not limited between so-called macrocell, and can comprise the border between the various dissimilar sub-districts, for example, and Microcell and macrocell, picocell and Microcell or the like.
Of the present invention different aspect, the system information in the network of regulation in all sub-district is a multidate information.By using multidate information in any given time, network can (for any given live load distribution) feasible quality of service optimization that offers the Packet data service user in whole zone.In order to obtain this ability, according to the present invention, system information (from Web broadcast, or send) can be according to the number of the packet of arranging in the number of portable terminal in each sub-district, each sub-district, the quality, grouping time-delay in each sub-district or the like of user's perception in each sub-district, and made.Like this, network algorithm (for example, by in base station controller BSC, or the processor among the mobile services switching centre MSC is carried out) can be used for drawing system information suitable, that have included deviant, and this direct messages is arrived all relevant MS to special MS or information broadcast.
Though above the GSM Packet data service (for example, illustrative aspects GPRS) has been described the present invention, that the present invention can be applied to is any, can using system information as the cellular wireless system of the input of the cell selecting algorithm that is added to MS control.And the present invention can be applied to cellular wireless system any, that may operate in the cell selecting pattern of MS control.Such system can comprise, for example, and the GPRS among the GSM, the GPRS among the D-AMPS, IS-95 system, cellular radio satellite system, and universal mobile telephone system (UMTS) and present and spread spectrum and Wideband Code Division Multiple Access (WCDMA) (WCDMA) system in the future.
Though at the most preferred embodiment of representing and in above detailed description, described method and apparatus of the present invention on the accompanying drawing, but it will be appreciated that, the present invention is not limited to the embodiment that disclosed, multiplely rearrange, revise and replace but can make, do not set forth and the spirit of the present invention of regulation and do not deviate from by following claim.
Claims (38)
1. under the cell selecting environment of MS control, a kind of method that is used for sharing cell load may further comprise the steps:
Determine first load in first sub-district and second load in the adjacent sub-district;
If described first load greater than predetermined value, then produces the system information that comprises at least one cell selecting parameter;
Described system information is sent at least one portable terminal in described first sub-district; And
In response to the selection parameter of described at least one sub-district, described at least one portable terminal is connected to described adjacent sub-district.
2. method as claimed in claim 1, wherein said at least one cell selecting parameter comprises the cell selecting deviant.
3. method as claimed in claim 1, wherein said at least one cell selecting parameter comprises cell selecting signal strength threshold value.
4. method as claimed in claim 1, wherein said at least one cell selecting parameter comprises cell selecting sub-district priority valve.
5. method as claimed in claim 1, wherein said at least one cell selecting parameter comprise the parameter about the decision of selecting which sub-district that influence is made by described at least one portable terminal.
6. method as claimed in claim 1, the cell selecting environment of wherein said travelling carriage control comprises wireless packet data networks.
7. method as claimed in claim 1, the cell selecting environment of wherein said travelling carriage control comprises GPRS network.
8. method as claimed in claim 1, wherein said system information comprises the CELL_RESELECT_OFFSET information area.
9. method as claimed in claim 1, wherein said system information comprise GPRS SI message.
10. method as claimed in claim 1, wherein said transfer step is included in broadcast system information message on the Broadcast Control Channel.
11. being included in, method as claimed in claim 1, wherein said transfer step send described system information on the dedicated channel to described at least one portable terminal.
12. method as claimed in claim 1, wherein said first load comprises the ratio of the number of channel in number of users total in the sub-district and the described sub-district.
13. method as claimed in claim 1, wherein said first load comprises number of users total in the sub-district.
14. method as claimed in claim 1, wherein said first load comprises the user's who works in the sub-district sum.
15. method as claimed in claim 1, wherein said first load comprise the ratio of the number of channel in the total number of users of working in the sub-district and the described sub-district.
16. method as claimed in claim 1, wherein said first load comprise the ratio of the number of channel in the sum of the packet of lining up in the sub-district and the described sub-district.
17. method as claimed in claim 1, wherein said first load comprises the measured value of available QoS in the sub-district.
18. as the method for claim 17, wherein said QoS comprises each user's bandwidth.
19. as the method for claim 17, that wherein said QoS comprises is that at least one can be finished, for user's QoS agreement.
20. under the cell selecting environment of travelling carriage control, a kind of system that is used for sharing cell load comprises:
First base station is used to stipulate first sub-district;
Second base station is used to stipulate second sub-district, and described second sub-district is adjacent with first sub-district;
At least one portable terminal is connected to described first base station;
Be used for determining the device of first load and second load in the adjacent sub-district of first sub-district;
Whether be used for determining described first load greater than predetermined value, and if generation comprises the device of the system information of at least one cell selecting parameter;
Be used for described system information is sent to device at least one portable terminal of described first sub-district; And
Be used in response to described at least one cell selecting parameter, described at least one portable terminal be connected to the device of described adjacent sub-district.
21. as the system of claim 20, wherein said at least one cell selecting parameter comprises the cell selecting deviant.
22. as the system of claim 20, wherein said at least one cell selecting parameter comprises cell selecting signal strength threshold value.
23. as the system of claim 20, wherein said at least one cell selecting parameter comprises cell selecting sub-district priority valve.
24. as the system of claim 20, wherein said at least one cell selecting parameter comprises the parameter about the decision of selecting which sub-district that influence is made by described at least one portable terminal.
25. as the system of claim 20, the cell selecting environment of wherein said travelling carriage control comprises wireless packet data networks.
26. as the system of claim 20, the cell selecting environment of wherein said travelling carriage control comprises GPRS network.
27. as the system of claim 20, wherein said system information comprises the CELL_RESELECT_OFFSET information area.
28. as the system of claim 20, wherein said system information comprises GPRS SI message.
29. as the system of claim 20, wherein said conveyer is included in the transmitter of broadcast system information message on the Broadcast Control Channel.
30. as the system of claim 20, wherein said conveyer is included in and sends the transmitter of described system information to described at least one portable terminal on the dedicated channel.
31. as the system of claim 20, wherein said first load comprises the ratio of the number of channel in number of users total in the sub-district and the described sub-district.
32. as the system of claim 20, wherein said first load comprises number of users total in the sub-district.
33. as the system of claim 20, wherein said first load comprises the user's who works in the sub-district sum.
34. as the system of claim 20, wherein said first load comprises the ratio of the number of channel in the total number of users of working in the sub-district and the described sub-district.
35. as the system of claim 20, wherein said first load comprises the ratio of the number of channel in the sum of the packet of lining up in the sub-district and the described sub-district.
36. as the system of claim 20, wherein said first load comprises the measured value of available QoS in the sub-district.
37. as the system of claim 20, wherein said QoS comprises each user's bandwidth.
38. as the system of claim 20, that wherein said QoS comprises is that at least one can be finished, for user's QoS agreement.
Applications Claiming Priority (2)
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|---|---|---|---|
| US15825998A | 1998-09-22 | 1998-09-22 | |
| US09/158259 | 1998-09-22 |
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|---|---|
| CN1319316A true CN1319316A (en) | 2001-10-24 |
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|---|---|---|---|
| CN 99811174 Pending CN1319316A (en) | 1998-09-22 | 1999-09-14 | Cell load sharing in mobile-controlled cell selection environment |
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| EP (1) | EP1116402A1 (en) |
| CN (1) | CN1319316A (en) |
| AU (1) | AU6490899A (en) |
| BR (1) | BR9913997A (en) |
| CA (1) | CA2344498A1 (en) |
| WO (1) | WO2000018164A1 (en) |
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| SE515898C2 (en) * | 1999-05-21 | 2001-10-22 | Ericsson Telefon Ab L M | A method for cell load distribution in a cellular mobile radio communication system |
| GB2377855A (en) * | 2001-07-18 | 2003-01-22 | Ericsson Telefon Ab L M | Cell re-selection based on cell loading |
| JP3987699B2 (en) * | 2001-09-10 | 2007-10-10 | 株式会社エヌ・ティ・ティ・ドコモ | Cell shape control method, mobile communication system, and base station and mobile device used in the system |
| CN100387088C (en) * | 2002-11-04 | 2008-05-07 | 中兴通讯股份有限公司 | Wireless communication system and load controlling method and apparatus thereof |
| GB2397469B (en) * | 2003-01-20 | 2006-05-17 | Motorola Inc | Method and apparatus for cell biasing in a cellular communication system |
| US7747256B2 (en) | 2006-07-21 | 2010-06-29 | Research In Motion Limited | Method and system for detecting data congestion and applying a cell reselection offset |
| EP1881718B1 (en) * | 2006-07-21 | 2009-07-15 | Research In Motion Limited | Method and system for detecting data congestion and applying a cell reselection offset |
| GB2445392B (en) * | 2006-11-16 | 2009-07-08 | Nec Corp | Load sharing in mobile radio communications network |
| CN101572934B (en) * | 2009-05-31 | 2011-08-24 | 中兴通讯股份有限公司 | Method and device for storing cell broadcast dynamic system information blocks |
| US8391141B2 (en) | 2009-06-18 | 2013-03-05 | Telefonaktiebolaget L M Ericsson (Publ) | Systems and methods for selecting a network access system |
| US9084171B2 (en) | 2009-09-10 | 2015-07-14 | At&T Mobility Ii Llc | Predictive hard and soft handover |
| GB2482734A (en) * | 2010-08-13 | 2012-02-15 | Nec Corp | Biased RSRP cell selection for use with overlapping cell operating ranges. |
| US9288733B2 (en) | 2011-09-23 | 2016-03-15 | Telefonaktiebolaget L M Ericsson (Publ) | Systems and methods for controlling cell selection in a heterogeneous cellular network based on primary direction of traffic flow |
| US9253794B2 (en) | 2011-12-02 | 2016-02-02 | Telefonaktiebolaget L M Ericsson (Publ) | Efficient spectrum utilization with almost blank subframes |
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| DE2659569C2 (en) * | 1976-12-30 | 1979-01-04 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Method and arrangement for transmitting information by radio |
| DE3441722A1 (en) * | 1984-11-15 | 1986-05-15 | Robert Bosch Gmbh, 7000 Stuttgart | RADIO TELEPHONE NETWORK |
| GB2315386B (en) * | 1996-07-13 | 2000-10-18 | Motorola Ltd | Improved flow control in cellular radio networks |
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1999
- 1999-09-14 BR BR9913997-9A patent/BR9913997A/en not_active IP Right Cessation
- 1999-09-14 CA CA002344498A patent/CA2344498A1/en not_active Abandoned
- 1999-09-14 EP EP99952844A patent/EP1116402A1/en not_active Withdrawn
- 1999-09-14 AU AU64908/99A patent/AU6490899A/en not_active Abandoned
- 1999-09-14 CN CN 99811174 patent/CN1319316A/en active Pending
- 1999-09-14 WO PCT/SE1999/001606 patent/WO2000018164A1/en not_active Application Discontinuation
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| CA2344498A1 (en) | 2000-03-30 |
| EP1116402A1 (en) | 2001-07-18 |
| AU6490899A (en) | 2000-04-10 |
| BR9913997A (en) | 2001-07-03 |
| WO2000018164A1 (en) | 2000-03-30 |
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