CN1228231A - Method of freeing voice channel in radio telecommunications network - Google Patents
Method of freeing voice channel in radio telecommunications network Download PDFInfo
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- CN1228231A CN1228231A CN 97196843 CN97196843A CN1228231A CN 1228231 A CN1228231 A CN 1228231A CN 97196843 CN97196843 CN 97196843 CN 97196843 A CN97196843 A CN 97196843A CN 1228231 A CN1228231 A CN 1228231A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
A method is disclosed of freeing a voice channel in a congested first cell (Cell B) in a cellular telecommunication system upon demand and without dropping an ongoing call. The method begins by identifying a second cell (Cell D) that neighbors the congested first cell, identifying a first mobile station (M2) operating on a voice channel in the congested first cell near the boundary of the second cell, and forcing a handoff of the first mobile station from the congested first cell to the second cell, thereby freeing the voice channel. If the second cell is also congested, the method identifies a third cell (Cell E) neighboring the second cell and identifies a second mobile station (M3) operating in the second cell near the boundary of the third cell. The method then forces a handoff of the second mobile station from the second cell to the third cell, thereby freeing a second voice channel located in the second cell. Finally, the method forces a handoff of the first mobile station from the congested first cell to the second cell, utilizing the second voice channel, thereby freeing the first voice channel in the congested first cell.
Description
The present invention relates to radio telecommunications system, and relate more specifically to quicken handover so that discharge the method for voice channel in the radio telecommunication network.
In existing cellular radio telecommunications network, the mobile subscriber of operation mobile radio station can roam into second mesh from first mesh when carrying out call.If in second mesh, have enough signal strength signal intensities, and if in second mesh, have available voice channel, this calling can be handed over to second mesh from first mesh.If in second mesh, do not have enough signal strength signal intensities or available voice channel, when the signal strength signal intensity from first mesh becomes too weak so that can not keep this calling, may lose this calling.
Similarly, attempt to insert cellular system so that originating call and when this mobile radio station was arranged in wherein mesh and is using all voice channels, access may be rejected at mobile radio station.In some existing cellular systems, be called the directed method of examination again and can improve the chance that successfully inserts cellular system.But attempt to insert cellular system and do not have a voice channel time spent at mobile radio station, this system attempts inserting the adjoining cells of appointment, and only in the time can not inserting the adjoining cells of appointment, system inserts and just is rejected.
Though do not have known to prior art instruction such as the solution of above-mentioned deficiency disclosed herein and shortcoming, the U.S. Patent number 4670899 of granting people such as Brody (Brody) discuss with discussed in this article in have the theme of some relations.Brody discloses the system and method for the call load between the mesh that is used for balance cellular mobile radiotelephone system.The channel of periodically determining each mesh uses, and this system attempts calling out from having mesh that higher voice channel takies level and is handed over to have and hangs down the adjoining cells that voice channel takies level.Can block and have the mesh that higher voice channel takies level, so that do not allow to be handed over to those mesh, have the mesh that higher voice channel takies level and can be used for to keep voice channel for the new mobile transceiver of calling out that starts yet for the handover of input by the refusal voice channel.Therefore, on predetermined space, Brody attempts again that the balance voice channel takies load, even in whole cellular system distribution load.
Yet if mesh becomes congested fully during the predetermined time interval of Brody, handover and system insert and are rejected, and Brody does not instruct or advises again balanced load and is the response request or the system of freeing voice channel in real time as required.This shows that aforesaid list of references is also unexposed or advise all as described herein and claimed methods.
In order to overcome the shortcoming of existing scheme, it is useful having for response request or discharging the method that voice channel in the congested mesh do not abandon ongoing calling as required in real time.The invention provides such method.
In one aspect, the present invention abandons ongoing calling as required and not, in cellular telecommunication system, discharge the method for the voice channel in the first congested mesh, the method comprises the steps: to discern second mesh adjacent with the first congested mesh, the mobile radio station of identifying operation in the first congested mesh, and force mobile radio station to switch to second mesh, thereby freeing voice channel from the first congested mesh.
In another aspect, the present invention abandons ongoing calling according to demand and not, in cellular telecommunication system, discharge the method for first voice channel in the first congested mesh, the method is by identification and the congested second adjacent mesh of first mesh, discern three mesh adjacent with second mesh, first mobile radio station and identifying operation second mobile radio station in second mesh of identifying operation in the first congested mesh begins, be to determine whether second mesh is congested after these steps, force second mobile radio station to be handed over to the 3rd mesh at definite second mesh when congested, thereby discharge second voice channel that is arranged in second mesh from second mesh.At last, the method utilizes second voice channel to force first mobile radio station to be handed over to second mesh from the first congested mesh, thereby discharges first voice channel in the first congested mesh.
By in conjunction with appended explanation, consult following accompanying drawing and will understand the present invention better, and many purposes of the present invention and advantage will become more apparent for those skilled in the art, wherein:
Fig. 1 wherein implements several schematic diagrames in abutting connection with mesh and mobile radio station in the cellular radio telecommunication system of the present invention;
Fig. 2 is several schematic diagrames in abutting connection with mesh and mobile radio station in the cellular radio telecommunication system of invention having been implemented recurrence (recursive) enhancing;
Fig. 3 A-3B is illustrated in to quicken the flow chart of steps carried out by the present invention during the handover procedure; With
Fig. 4 A-4B is illustrated in the flow chart of steps of being carried out by the present invention in the recurrence acceleration handover procedure.
Fig. 1 wherein implements several schematic diagrames in abutting connection with mesh and mobile radio station in the cellular radio telecommunication system of the present invention.Mesh is labeled as mesh A to mesh E, and two signal mobile radio stations that operate in the mesh are labeled as M1 and M2.
When the area of coverage in mobile radio station roaming out of net hole, the signal strength signal intensity that must measure adjoining cells is to determine that mobile radio station is reselect specific adjacent service mesh (" mesh is reselected " in the idle pulley) still should be handed over to one of adjoining cells (" handover " in the busy pattern).The location, checking (Presence Verification) and handover to occur be to deliver when keeping high signal quality everywhere when mobile radio station is mobile in cellular network to call out desired three processes between each mesh.The purpose of positioning function is that to search for specific mobile radio station be the mesh that the best radio receiving feature is arranged, the purpose that authentication function occurs is in the appearance of checking mobile radio station in selected mesh before the handover, and the purpose of hand-off functionality is according to positioning function and authentication function is sent to ongoing calling this calling of processing preferably safely from a mesh another mesh occurs.Also can in same mesh, be handed over to one other channel or such as between the grand mesh of rete cutaneum hole and covering with carry out handover from overlay mesh.
Mobile radio station in busy for being in (calling out) operator scheme has two kinds of selectable execution positioning functions and identification when should begin the method for handover, and a kind of method uses mobile radio station assisted hand-off (MAHO) and mobile radio station to carry out positioning function.
When mobile radio station begins to operate on the digital service channel, mobile radio station is measured the quality that radio link is connected by the error rate of measuring on the channel of its distribution with received signal intensity, and this mobile radio station is also measured the signal quality from the adjoining cells channel of tabulation in measuring sequence of base station.The channel that is listed in the measuring sequence (MAHO table) can upgrade and download to each mobile radio station as required.This MAHO table can customize for each mobile radio station according to predetermined criterion.Mobile radio station is periodically measured the received signal intensity of each channel of listing and the MAHO measurement is turned back to the base station in the MAHO table, the base station receives the channel quality message of its adjoining cells and compares these channels mutually.The signal strength signal intensity and the propagation path loss (transmission power level deducts the signal strength signal intensity of reception) of reception considered in the base station.Parameter in the base station determines whether hand-off request should send to mobile switching centre (MSC).
The another kind of localization method that is called classical localization method does not use MAHO, and by determining that radio link quality is carried out positioning function in serving BS and the adjacent base station thereof, serving BS is measured the quality that radio link connects by the received signal intensity of measuring on the service channel, and serving BS is then considered received signal intensity and propagation path loss (transmission power level deducts received signal intensity).Parameter in the base station is used for subsequently determining whether hand-off request should send to MSC, and MSC then asks to measure from the adjoining cells and the service channel of outer mesh, and wherein each mesh has the signal strength signal intensity receiver that is used for this purpose.The foundation that MSC arranges adjoining cells and outer mesh subsequently is used for the candidate list of handover.Mesh far away is not included in the candidate's mesh on the MAHO table usually.For example, for mesh A, mesh B can be the candidate's mesh on the MAHO table, and mesh C or mesh D then are not.
In the cellular system that does not utilize MAHO, the location is installed in each base station with demo plant, and the location can be measured by the signal strength signal intensity on each frequency of base station and adjoining cells operation thereof independently with demo plant.
The appearance of checking mobile radio station after localization process and in the mesh of carrying out the optimal candidate mesh of being appointed as handover with checking before the handover occurs, checking occurs according in the base station of adjoining cells, carrying out from the instruction of service MSC.In the time of on operating in the digital service channel, the old channel number of this mobile radio station, speed, time slot and digital verification colour code (DVCC) are provided for the base station in candidate's mesh of handover, and order this base station to verify the appearance of this mobile radio station on old channel.In candidate's handover mesh, utilize its position and demo plant to carry out the last signal strength measurement of this mobile station signal, and if this signal strength signal intensity cross predetermined threshold, then begin handover.In the time of on operating in analog voice channel, measure signal intensity on the voice channel that is used for service channel monitoring audible sound (SAT), this authorization information reports to NSC.
Can utilize MAHO checking carry out to occur or do not utilize MAHO to carry out positioning function, utilize location and demo plant in candidate's the base station of handover mesh confirmatory measurement to occur.
The location, checking and the top description of hand-off functionality occur and described handover in the overlay area of single MSC.Handover also can be crossed convertor boundary and carry out between mesh among the MSC and the outside mesh among another MSC.Except carrying out the location, occurring checking and the hand-off functionality, support the cellular network of the inter-exchange handover of mobile radio station must between included MSC, exchange outside mesh information.The standard agreement that is used for the inter-exchange signaling is IS-41, and this agreement is introduced in this as a reference.When between MSC, carrying out the inter-exchange handover, use known IS-41 message to come between switch, to transmit the desired information of handover of calling out.These message can comprise that handover measurement request (Hahd Meas Req) message, facility orientation (Fac Dir) message, handover return (Hahd Back) message and be handed off to third party (Hand Third) message.
The handover measurement request message is used for asking the location survey at the outside mesh of the localization method of classics, with the outside mesh of the optimal candidate that is identified for handover.This message also is used for asking the appearance authorization information of adjacent external mesh, with the checking mobile radio station in those mesh appearance and definite optimal candidate outside mesh.If service MSC determines to be handed off to an outer mesh among the adjacent MSC, then ask voice channel.
When since in the specific mesh voice channel congested and must abandon ongoing mobile radio station and call out maybe and must the refusal mobile radio station to call out when inserting, utilize method of the present invention that voice channel can be utilized.In fact, the present invention's " bump (bump) " utilizes another mobile radio station of voice channel, and utilizes the voice channel that discharges to provide service for the calling or the unaccepted access that will be dropped.Before giving an order with handover mechanism in existing location, be handed over to another mesh (that is the handover of acceleration) by the bump mobile radio station and be retained to by forcing by the service of bump mobile radio station with idle voice channel.
Referring to Fig. 1, M1 just roams into mesh B from mesh A again, but does not have idle voice channel in mesh B.Therefore, the inventive method is quickened (forcing) M2 and is handed over to mesh C or mesh D so that for M1 discharges voice channel the mesh B, the situation of calling out access is similar from mesh B.Insert cellular system if idle mobile radio station is arranged in mesh A and attempts at that, the present invention can quicken M2 from mesh B be handed over to mesh C or mesh D in case idle for this reason mobile radio station as orientation again call attempt be this system of access and discharge voice channel the mesh B.Selectively, the voice channel that discharges among the mesh B can be used for quickening the handover of mobile radio station among the mesh A, thereby discharges the voice channel of the mesh A can be used for serving new calling.
For Digital Cellular System, system has had candidate's mesh table, and each candidate's mesh has its MAHO signal measurement separately.For analogue system, picked up signal ionization meter from the adjoining cells of each mobile radio station periodically.In addition, enforcement of the present invention is identical.The present invention selects to have enough signal strength signal intensities that is used to serve (SS-SUFF) but is not enough to trigger candidate's mesh of handover (SS-HANDOFF), and the present invention also can select to have SS-HANDOFF but not trigger the mesh of handover owing to for example stop the control of handover alternately.In addition, the present invention can use the 3rd signal strength threshold value to represent to quicken the desired minimum signal strength of handover (SS-AHOFF), and this SS-AHOFF value is arranged between SS-SUFF and the SS-HANDOFF.When SS-AHOFF is set to equal SS-SUFF,, just allow the handover that quickens as long as there are enough signal strength signal intensities to be used for wanting maintained service.When SS-AHOFF is set to equal SS-HANDOFF, forbid the handover that quickens effectively.Therefore, system operator can utilize the SS-AHOFF thresholding to allow or forbid quickening handover, and the reduction amount that is allowed during the handover of control acceleration.
Can be by scanning mobile radio stations all in the congested mesh and selecting to have the signal strength signal intensity of the highest reception or a mobile radio station that MAHO measures is selected the mobile radio station that clashes into.For the mobile radio station calling that forces handover, speech quality has some to be reduced, but this reduction can be restricted to arbitrarily small quantity by adjusting the SS-AHOFF threshold value as mentioned above.
Say that from structure quickening to be handed off to idle voice channel (AHFVC) function is the part that voice channel is selected (VCS) function.Below table 1 be illustrated in call out start, the position of VCS in call terminations and the handover case.
| Call phase | Message source | The message destination | Explanation |
| MS starts | MS-system | System-MS | (voice channel selection) expression VC starts |
| MS terminating | System MS-system | MS system-MS | Paging page response (voice channel selection) expression VC |
| Handover | System MS-system | MS system-MS | Measured channel channel measurement (voice channel selection) handover |
Table 1: voice channel selection function in each call phase
The AHFVC function is the general module that uses during the VCS in all above-mentioned call phases.
The AHFVC function is applied in each mesh and is divided into two parts: continuously the background parts of carrying out and only in the time will carrying out the acceleration handover, just carry out require part.The major part of background parts is used to determine when with beginning mobile radio station handover in MAHO handles.As mentioned above, the signal strength signal intensity that receives the channel of moving station measuring from the MAHO table that offers them with measuring sequence, and the MAHO measurement returned to the base station.On the time of any appointment, in the mesh of appointment, measure to utilize by the MAHO that provides of mobile radio station of service and represent such as the table of following table 2.P11 to PMN represent by each mobile radio station for its separately the dBm that carries out of each adjoining cells in the MAHO table be the exemplary measurement of power levels of unit.
| ?NCELL 1 | ?NCELL 2 | … | ?NCELL J | … | NCELL N | |
| ??MS 1 | ?P 11 | ?P 12 | ?PI N | |||
| ?MS 2 | ?P 21 | ?P 22 | ?P2 J | |||
| ?MS 3 | ?P 31 | |||||
| ??… | ||||||
| ?MS I | ?P 11 | PI J | ?P IN | |||
| ?… | ||||||
| ?MS M | ?P M1 | ?P MN |
Table 2: the interior MAHO of mesh measures
A N adjoining cells of specifying mesh of M mobile radio station of table 2 expression service, a P
IJExpression is by I mobile radio station (MS
I) at J adjoining cells (NCELL
J) the last received signal intensity of measuring.If can't help the moving station measuring adjoining cells, then the corresponding power level of this adjoining cells is input as-∞ in this table.Utilize the MAHO of table 2 to measure, the background parts of AHFVC function can be discerned the mobile radio station with maximum received signal strength of each adjoining cells by the maximal term of determining every row, and is as shown below:
MAX-Level
J=MAX
I:1-M(PI
J)
Obtain adjoining cells (for example, NCELL
J) mobile radio station of the highest received signal intensity that reads is to quicken to be handed off to NCELL
JIdeal candidates person, such mobile radio station is expressed as: CAND-AH
J, acceleration is handed off to the candidate of mesh J.Therefore, if P
IJ=MAX-Level
J, CAND-AH then
J=MS1.
Given each adjoining cells NCELL
1To NCELL
NMAX-Level (maximum level), the background parts of AHFVC function forms the adjoining cells table of ordering, all adjoining cells satisfy and to be used to quicken the SS-AHOFF criterion of handover, and all adjoining cells sort to successively decrease in proper order according to the MAX-Level value of this mesh:
Sorted-Neighbor-List (the adjoining cells table of ordering)={ (Cell
A, Cell
B, Cell
C..., MAX-Level wherein
A〉=MAX-Level
B〉=MAX-level
C〉=
When needs quicken handover, carry out the part that requires of AHFVC function, the identification of the output of this part adjoining cells that to be mobile radio station be handed off to the mobile radio station that should force identification.The adjoining cells table of not considered inputs to and requires part.If Kong Xian mobile radio station was just being attempted connecting system in congested mesh in the past, the mesh table of eliminating can comprise the mesh that wherein directed examination has again been attempted and failed.For the mobile radio station that requires to be handed off to congested mesh, get rid of the mesh table and can comprise and wherein run into the congested mesh of voice channel.
Given Sorted-Neighbor-List and eliminating table of deriving by background parts, require part to calculate the difference table by deduct the eliminating table from Sorted-Neighbor-List, this result is the classification chart of the adjoining cells that can attempt being handed off to: Sorted-Neighbor-list={ Cell
A 'Cell
B 'Cell
C '} ' where
MAX-level
A≥MAX-level
B≥MAX-level
C2…
In the situation of example, first quickens the NCELL in the whole adjoining cells table that the handoff candidate mesh can be a table 2
J, then force the desirable mobile radio station of handover to be: CAND-AH
J=MS
I
Therefore, at mesh Cell
JIn be that MSI attempts handover.If handover is successful, then freeing voice channel.If handover is unsuccessful, then next attempt second mesh in the AHFVC table, this handles continuation, until handover that success is arranged or the most AHFVC table of examination.
In the analogue system situation, as discussed above, mobile radio station does not provide channel measurement to system.On the contrary, each base station comprises that the signal strength signal intensity receiver is to monitor the signal level of the voice channel frequency of using in the adjoining cells.When the signal quality of mobile radio station in the service mesh drops to predetermined threshold when following, the signal level measuring of system's poll adjoining cells to provide each adjoining cells to receive on the voice channel of this mobile radio station of service.Have the adjoining cells of the signal strength signal intensity of high reception and represent the optimal candidate mesh of handover.If preferred mesh can not call accepted because voice channel is congested, then also can attempt being handed off to the adjoining cells of low received signal intensity.
In order to implement the present invention, a mesh must periodically obtain the received signal intensity level for each its adjoining cells of mobile radio station poll of its service.This poll is similar to the structure of MAHO table, but these channel measurements are up links and provide by system rather than by mobile radio station.Periodic signal strength values is used for compile list 2 subsequently.
Fig. 2 represents that wherein recurrence strengthens several schematic diagrames in abutting connection with mesh and mobile radio station in the enforcement cellular radio telecommunication system of the present invention.Recurrence refers to repeatedly use the ability of AHFVC function in needing each mesh of voice channel, generate the recurrent chain of handover.When mobile radio station M1 begins when mesh A roams to mesh B, require to be handed off to mesh B.If there is not available voice channel in mesh B, then AHFVC function identification is used to quicken the mobile radio station M2 of handover, and identification mesh C and mesh D are candidate's mesh of handover.If mesh C and mesh D are congested, then the AHFVC function recursively is applied to the candidate (that is first element of AHFVC table) of tool potentiality.In example shown in Figure 2, this candidate is mesh D, and the AHFVC function is discerned the mobile radio station M3 that is used to quicken handover subsequently, and identification mesh E is candidate's mesh of handover.If voice channel is available in mesh E, then attempts mobile radio station M3 and be handed off to mesh E.If success, it is available then making voice channel in mesh D, this voice channel is used for mobile radio station M2 subsequently and is handed off to mesh D from mesh B, and this handover discharges conversely and is used for mobile radio station M1 is handed off to mesh B from mesh A voice channel among the mesh B.
When recursively using the AHFVC function, adjoining cells must be geographically progressively away from the first service mesh, and the eliminating table of the mesh that this has considered in recurrent chain before utilizing and eliminating from the AHFVC table is realized.Thereby the eliminating table that sends the next stage recurrence to is one and offers the eliminating table union of the requirement part of AHFVC function with other AHFVC table of current level.
Fig. 3 A-3B is illustrated in to quicken the flow chart of steps carried out by the present invention during the handover procedure.If wherein implementing cellular telecommunication system of the present invention is digital system, as determined at step 3O, this program moves on to step 31, collects MAHO and measure in step 31 interested mesh from the mobile radio station that service is provided for it.If this cellular system is not digital (that is, simulating), then in the received signal intensity (RSS) of step 32 service mesh for serviced its adjoining cells of mobile radio station poll of service mesh.Program moves on to step 33 subsequently, and the background parts of AHFVC function compiles the RSS value table of serviced mobile radio station and adjoining cells in step 33.In step 34, the AHFVC function derive to satisfy the Sorted-Neighbor-List of candidate's mesh of the ordering of the SS-AHOFF thresholding that is used to quicken handover.In step 35, from before when attempting handover, find by congested mesh and derive the eliminating table the mesh that inserts of the not acquisition system that tries again from its orientation, this eliminating table inputs to the part that requires of AHFVC function subsequently in step 36.Calling when requiring part, at first checking to determine whether Sort-Neighbor-List is sky (promptly not having the MAX-Level item to satisfy the SS-AHOFF thresholding) at step 36A.If like this, then the AHFVC function can not continue, and returns failure result.In step 37, the requirement of AHFVC function part derives the AHFVC table by deduct the eliminating table from Sorted-Neighbor-List.If the AHFVC table is empty (because Sorted-Neighbor-List is the subclass of eliminating table) in step 37A, then the AHFVC function can not continue, and returns failure result at step 37B.Otherwise this program then moves on to the step 38 of Fig. 3 B.
In step 38, program is provided with i=1.In step 39, then attempt being handed off to the Celli of AHFVC table.In step 41, determine whether handover is successful.If success, then program moves on to step 42, in step 42, returns the voice channel of release so that use.If unsuccessful at step 41 handover, then program moves on to step 43, determines whether to attempt being handed off to all mesh in the AHFVC table.If then program moves on to step 44, return failure.If also do not attempt being handed off to all mesh in the AHFVC table, then program moves on to step 45 and the next mesh that the i=i+1 program turns back to step 39 subsequently and attempts being handed off to the AHFVC table is set, this continuation that circulates is until freeing voice channel or unsuccessful all mesh of attempting being handed off to the AHFVC table.
Fig. 4 A-4B is illustrated in the flow chart of steps of being carried out by the present invention during the acceleration handover procedure of recurrence.If wherein implementing cellular telecommunication system of the present invention is digital system, as determined in step 40, this program moves on to step 41, collects MAHO in the serviced mobile radio station in step 41 from interested mesh and measures.If this cellular system is not digital (that is, simulating), then serve mesh in the received signal intensity (RSS) of step 42 for serviced its adjoining cells of mobile radio station poll of service mesh.Program moves on to step 43 subsequently, and in step 43, the background parts of AHFVC function compiles the RSS value table of serviced mobile radio station and adjoining cells.In step 44, the AHFVC function derive to satisfy the Sorted-Neighbor-List of the ordering candidate mesh of the SS-AHOFF signal strength threshold that is used to quicken handover.At step 44A, the recurrence control counter is set to zero and represents also not take place recurrence.In step 45, from before when attempting handover, find by congested mesh and derive the eliminating table the mesh that inserts of the not acquisition system that tries again from its orientation, this eliminating table inputs to the part that requires of AHFVC function subsequently in step 46.When calling this and require part, at first in step 46A, check to determine whether sorted-Neighbor-List is sky (that is, not having the MAX-Level item to satisfy the SS-AHOFF standard).If like this, the AHFVC function can not continue, and returns failure result.In step 47, the requirement of AHFVC function part derives the AHFVC table by deduct the eliminating table from Sorted-Neighbor-List.If the AHFVC table is empty (because Sorted-Neighbor-List is the subclass of eliminating table), then the AHFVC function can not continue, and returns failure result at step 47A.Otherwise program moves on to the step 48 of Fig. 4 B.
In step 48, program is provided with i=1.In step 49, then attempt being handed off to the Cell of AHFVC table
iIn step 51, determine whether handover is successful.If success, then program moves on to step 52, returns the voice channel of release so that use.If handover is unsuccessful in step 51, then program moves on to step 53, determines whether to attempt being handed off to all mesh in the AHFVC table.If do not attempt being handed off to all mesh in the AHFVC table, then program moves on to step 54 and i=i+1 is set, this program turns back to step 39 subsequently and attempts being handed off to the next mesh of AHFVC table, this continuation that circulates is until freeing voice channel or unsuccessful all mesh of attempting being handed off to the AHFVC table.
If attempted being handed off to all mesh in the AHFVC table in step 53, then program moves on to step 55, checks so that by determining whether that arriving recursive limit determines whether to attempt recurrence.If arrived recursive limit, then program moves on to program 56 and returns failure result.Note.If recursive limit is set to 0, then forbid recurrence, and the AHFVC function is returned failure result.On the recurrence of each grade, program determines whether to attempt the recurrence of another grade.If no show recursive limit in step 55, then allow recurrence to continue, and program moves on to step 57, program is provided with new eliminating table=(getting rid of table+AHFVC shows) in step 57, increase progressively recursion counter subsequently in step 58, this program turns back to step 46 and then at Cell
1Carry out the AHFVC function in (first element of AHFVC table).
Thereby, believe that from the foregoing description operation of the present invention and structure will be conspicuous.Though shown in be expressed as preferably with described method, apparatus and system, obviously can carry out various variations and modification and not break away from as defined spirit of the present invention and category in following claims.
Claims (22)
1. be used for abandoning as required and not a kind of method of ongoing calling, said method comprising the steps of at the first congested mesh freeing voice channel of cellular telecommunication system:
Discern second mesh, described second mesh is adjacent with the described first congested mesh;
Discern first mobile radio station, described first mobile radio station operates in the described first congested mesh; With
Force described first mobile radio station to be handed off to described second mesh, thereby discharge described voice channel from the described first congested mesh.
2. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 1, wherein the described step of identification second mesh adjacent with described congested first mesh comprises the signal strength signal intensity that measurement receives between described first mobile radio station and a plurality of mesh adjacent to described congested first mesh.
3. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 2, the described step of wherein measuring the signal strength signal intensity that receives between described first mobile radio station and a plurality of mesh adjacent to described congested first mesh comprises the described received signal intensity of measuring on described first mobile radio station.
4. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 2, wherein measure described step in the signal strength signal intensity that receives between described first mobile radio station and a plurality of mesh and comprise the described received signal intensity of measuring on described a plurality of mesh adjacent with described congested first mesh adjacent to described congested first mesh.
5. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 2, wherein the described step of identification second mesh adjacent with described congested first mesh comprises that identification has a received signal intensity and described congested adjacent mesh of first mesh of highest measurement among described a plurality of mesh adjacent with described congested first mesh.
6. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 1, wherein the described step of first mobile radio station of identifying operation in described congested first mesh comprises that identifying operation is near first mobile radio station in the first described congested mesh on the described second mesh border.
7. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 6, wherein the described step of first mobile radio station of identifying operation in described congested first mesh comprises that identification has first mobile radio station that is enough to remain on the signal strength signal intensity of calling out in described second mesh that receives from described second mesh.
8. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 1, the described step of wherein forcing described first mobile radio station to be handed off to described second mesh from the described first congested mesh is included in and forces described handover when second mobile radio station in described congested first mesh needs occupied voice channel.
9. the method for freeing voice channel in the first congested mesh of cellular telecommunication system according to Claim 8, the described step of wherein forcing described first mobile radio station to be handed off to described second mesh from the described first congested mesh is included in and forces described handover when described second mobile radio station is attempted inserting described cellular telecommunication system in the described first congested mesh.
10. according to the method for freeing voice channel in the first congested mesh of cellular telecommunication system of claim 9, further comprising the steps of:
Discern the 3rd mesh, described the 3rd mesh is adjacent with described second mesh;
Discern the 3rd mobile radio station, described the 3rd mobile radio station operates in described second mesh;
Force described the 3rd mobile radio station to be handed off to described the 3rd mesh from described second mesh; With
Guide described second mobile radio station to try again into described cellular telecommunication system as orientation by described second mesh.
11. the method for freeing voice channel in the first congested mesh of cellular telecommunication system according to Claim 8, the described step of wherein forcing described first mobile radio station to be handed off to described second mesh from the described first congested mesh comprise that during described second mobile radio station is being called out roaming forces described handover when entering the described first congested mesh.
12. the method for freeing voice channel in the first congested mesh of cellular telecommunication system according to Claim 8, the described step of wherein forcing described first mobile radio station to be handed off to described second mesh from the described first congested mesh are included in described cellular telecommunication system and force described handover automatically perform the handover of described first mobile radio station according to predetermined criterion before.
13. be used for as required and not abandoning a kind of method of ongoing calling, said method comprising the steps of at the first congested mesh freeing voice channel of cellular telecommunication system:
Discern second mesh, described second mesh is adjacent with the described first congested mesh, and the described step of discerning second mesh comprises:
Measuring operation in described congested first mesh first mobile radio station and a plurality of mesh adjacent to described congested first mesh between the signal strength signal intensity that receives; With
Identification has a received signal intensity and described congested adjacent mesh of first mesh of highest measurement among described a plurality of mesh adjacent with described congested first mesh; With
When second mobile radio station in described congested first mesh needs occupied voice channel, force described first mobile radio station to be handed off to described second mesh, wherein force the described step of described handover to carry out automatically perform the handover of described first mobile radio station according to predetermined criterion at described cellular telecommunication system before from the described first congested mesh.
14. be used for according to demand and not abandoning a kind of method of ongoing calling, said method comprising the steps of in congested first mesh release, first voice channel of cellular telecommunication system:
Discern second mesh, described second mesh is adjacent with the described first congested mesh;
Discern the 3rd mesh, described the 3rd mesh is adjacent with described second mesh;
Discern first mobile radio station, described first mobile radio station operates in the described first congested mesh;
Discern second mobile radio station, described second mobile radio station operates in described second mesh;
Determine whether described second mesh is congested;
If determine that described second mesh is congested, then force described second mobile radio station to be handed off to described the 3rd mesh, thereby discharge second voice channel that is arranged in described second mesh from described second mesh; With
Utilize described second voice channel to force described first mobile radio station to be handed off to described second mesh, thereby discharge described first voice channel in described congested first mesh from the described first congested mesh.
15. according to the method that in the first congested mesh of cellular telecommunication system, discharges first voice channel of claim 14, wherein the described step of identification three mesh adjacent with described second mesh comprise identification not with described congested the 3rd adjacent mesh of first mesh.
16. according to the method that discharges first voice channel in the first congested mesh of cellular telecommunication system of claim 14, wherein the described step of identification second mesh adjacent with described congested first mesh comprises described first mobile radio station of measurement and adjacent to received signal intensity between a plurality of mesh of described congested first mesh.
17. according to the method that discharges first voice channel in the first congested mesh of cellular telecommunication system of claim 16, wherein the described step of identification second mesh adjacent with described congested first mesh comprises that identification has a received signal intensity and described congested adjacent mesh of first mesh of highest measurement among described a plurality of mesh adjacent with described congested first mesh.
18. according to the method that discharges first voice channel in the first congested mesh of cellular telecommunication system of claim 14, wherein the described step of first mobile radio station of identifying operation in described congested first mesh comprises identifying operation first mobile radio station near the described second mesh border in described congested first mesh.
19. according to the method that discharges first voice channel in the first congested mesh of cellular telecommunication system of claim 17, wherein the described step of first mobile radio station of identifying operation in described congested first mesh comprises that identification has being enough to of receiving and remains on first mobile radio station of the signal strength signal intensity of the calling in described second mesh from described second mesh.
20., wherein force described second mobile radio station from described second mesh, to carry out handover and the described step of forcing described first mobile radio station to carry out handover from the described first congested mesh is included in and forces described handover when the 3rd mobile radio station needs occupied voice channel the described first congested mesh according to the method that in the first congested mesh of cellular telecommunication system, discharges first voice channel of claim 14.
21., wherein when the 3rd mobile radio station needs occupied voice channel in described congested first mesh, force the described step of described handover to be included in described cellular telecommunication system and force described handover before automatically performing described handover according to predetermined criterion according to the method that in the first congested mesh of cellular telecommunication system, discharges first voice channel of claim 20.
22. be used for as required and not abandoning a kind of method of ongoing calling in congested first mesh release, first voice channel of cellular telecommunication system, described method comprises step:
Discern second mesh, described second mesh is adjacent with the described first congested mesh, and the described step of discerning second mesh may further comprise the steps:
Measuring operation in described congested first mesh first mobile radio station and a plurality of mesh adjacent to described congested first mesh between the signal strength signal intensity that receives; With
Identification has a received signal intensity and described congested adjacent mesh of first mesh of highest measurement among described a plurality of mesh adjacent with described congested first mesh;
Discern the 3rd mesh, described the 3rd mesh is adjacent with described second mesh, but not adjacent with the described first congested mesh;
Discern second mobile radio station, described second mobile radio station operates in described second mesh, and described second mobile radio station has the signal strength signal intensity that is enough to remain on the calling described the 3rd mesh that receives from described the 3rd mesh;
Determine whether described second mesh is congested;
If determine that second mesh is congested, then force described second mobile radio station to be handed off to described the 3rd mesh from described second mesh, thereby discharge second voice channel be arranged in described second mesh, automatically perform the described handover that forces described second mobile radio station before the described handover of described second mobile radio station at described cellular telecommunication system according to predetermined criterion; With
Utilize described second voice channel to force described first mobile radio station to be handed off to described second mesh from the described first congested mesh, thereby discharge described first voice channel in described congested first mesh, automatically perform the described handover that forces described first mobile radio station before the described handover of described first mobile radio station at described cellular telecommunication system according to predetermined criterion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68166896A | 1996-07-29 | 1996-07-29 | |
| US08/681,668 | 1996-07-29 |
Publications (2)
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| CN1228231A true CN1228231A (en) | 1999-09-08 |
| CN1100457C CN1100457C (en) | 2003-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97196843A Expired - Fee Related CN1100457C (en) | 1996-07-29 | 1997-07-11 | Method of freeing voice channel in radio telecommunications network |
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| Country | Link |
|---|---|
| CN (1) | CN1100457C (en) |
| AU (1) | AU724174B2 (en) |
| DE (2) | DE19781897T1 (en) |
| GB (1) | GB2331673B (en) |
| WO (1) | WO1998005175A2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303840C (en) * | 2000-12-05 | 2007-03-07 | 高通股份有限公司 | Method and apparatus for call recovery in a wireless communication system |
| CN100379302C (en) * | 2002-08-15 | 2008-04-02 | 汤姆森特许公司 | Technique seamless handoff of a mobile terminal user from a wireless telephony network to a wireless LAN |
| CN101262422B (en) * | 2007-02-02 | 2011-07-27 | 索尼株式会社 | Wireless communication system, wireless wireless communication device and wireless communication method |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762166B1 (en) * | 1997-04-10 | 1999-06-11 | Alsthom Cge Alcatel | METHOD AND DEVICE FOR THE PREDICTION OF RADIO RESOURCE IN A CELLULAR RADIOCOMMUNICATION SYSTEM WITH MOBILES |
| SE522542C2 (en) * | 1998-03-26 | 2004-02-17 | Telia Ab | Method for redistributing traffic load on a cellular cellular telephone system |
| US6381458B1 (en) | 1998-05-15 | 2002-04-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system for soft handoff control based on access network capacity |
| US6081713A (en) * | 1998-05-18 | 2000-06-27 | Telefonaktiebolaget Lm Ericsson | Method of selectively directing a mobile station to retry system access in a radio telecommunication system |
| AU2001226697A1 (en) * | 2000-11-28 | 2002-06-11 | Nokia Corporation | A method for determining neighboring cells in a communication network |
| US7567781B2 (en) | 2001-01-05 | 2009-07-28 | Qualcomm, Incorporated | Method and apparatus for power level adjustment in a wireless communication system |
| CN1159878C (en) * | 2000-12-07 | 2004-07-28 | 华为技术有限公司 | Macrodiversity-based direct retry method for CDMA system |
| US6882677B2 (en) * | 2001-02-28 | 2005-04-19 | Motorola, Inc. | Method and apparatus for facilitating handoff in a wireless local area network |
| GB2395632B (en) * | 2002-11-23 | 2006-01-11 | Motorola Inc | Communication system and method for reducing congestion therein |
| WO2005025253A1 (en) * | 2003-08-27 | 2005-03-17 | Fujitsu Limited | Handover method and base station control device |
| KR100689508B1 (en) | 2003-09-04 | 2007-03-02 | 삼성전자주식회사 | Method for performing handover in a communication system |
| IL260171B (en) | 2018-06-20 | 2021-10-31 | Omnistream | Systems and methods for triggering a handover in wireless communication networks |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1230663A (en) * | 1968-12-10 | 1971-05-05 | ||
| SE458734B (en) * | 1984-10-31 | 1989-04-24 | Ericsson Telefon Ab L M | PROCEDURE TO PROVIDE THE NUMBER OF CALL OPPORTUNITIES IN A MOBILE PHONE SYSTEM |
| DE3441722A1 (en) * | 1984-11-15 | 1986-05-15 | Robert Bosch Gmbh, 7000 Stuttgart | RADIO TELEPHONE NETWORK |
| US4670899A (en) * | 1985-05-31 | 1987-06-02 | Northern Telecom Limited | Load balancing for cellular radiotelephone system |
| US5241685A (en) * | 1991-03-15 | 1993-08-31 | Telefonaktiebolaget L M Ericsson | Load sharing control for a mobile cellular radio system |
| US5428816A (en) * | 1993-09-09 | 1995-06-27 | Hughes Aircraft Company | Method and apparatus for mobile assisted handoff |
| US5633915A (en) * | 1995-05-16 | 1997-05-27 | Southern Methodist University | Multilayered arrangement for load sharing in a cellular communication system |
| US5790954A (en) * | 1995-05-30 | 1998-08-04 | Motorola, Inc. | Methods of requesting volunteers for handoff in a cellular system |
-
1997
- 1997-07-11 WO PCT/SE1997/001269 patent/WO1998005175A2/en active Application Filing
- 1997-07-11 CN CN97196843A patent/CN1100457C/en not_active Expired - Fee Related
- 1997-07-11 DE DE19781897T patent/DE19781897T1/en active Pending
- 1997-07-11 GB GB9901707A patent/GB2331673B/en not_active Expired - Fee Related
- 1997-07-11 DE DE19781897A patent/DE19781897B4/en not_active Expired - Fee Related
- 1997-07-11 AU AU37131/97A patent/AU724174B2/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303840C (en) * | 2000-12-05 | 2007-03-07 | 高通股份有限公司 | Method and apparatus for call recovery in a wireless communication system |
| CN100379302C (en) * | 2002-08-15 | 2008-04-02 | 汤姆森特许公司 | Technique seamless handoff of a mobile terminal user from a wireless telephony network to a wireless LAN |
| CN101262422B (en) * | 2007-02-02 | 2011-07-27 | 索尼株式会社 | Wireless communication system, wireless wireless communication device and wireless communication method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19781897T1 (en) | 1999-09-23 |
| WO1998005175A3 (en) | 1998-03-05 |
| GB9901707D0 (en) | 1999-03-17 |
| AU724174B2 (en) | 2000-09-14 |
| WO1998005175A2 (en) | 1998-02-05 |
| CN1100457C (en) | 2003-01-29 |
| GB2331673B (en) | 2001-02-07 |
| GB2331673A (en) | 1999-05-26 |
| AU3713197A (en) | 1998-02-20 |
| DE19781897B4 (en) | 2009-02-19 |
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