CN1084131C - Method and system for providing communications service to a coverage hole - Google Patents
Method and system for providing communications service to a coverage hole Download PDFInfo
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- CN1084131C CN1084131C CN96190325A CN96190325A CN1084131C CN 1084131 C CN1084131 C CN 1084131C CN 96190325 A CN96190325 A CN 96190325A CN 96190325 A CN96190325 A CN 96190325A CN 1084131 C CN1084131 C CN 1084131C
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- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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- Computer Networks & Wireless Communication (AREA)
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Abstract
Providing communications service to a coverage hole (22) in a DS-CDMA cellular communication system (50) involves an OMC (52) determining the transmitters (134-144) in adjacent cells (122-132) to the coverage hole (22). The OMC (52) places each of the transmitters (134-144) in the adjacent cells (122-132) in a power on demand mode (92). The OMC (52) then selects at least one, but less than all of the transmitters (134-144) to increase power to a pilot channel. The selected transmitter(s) is chosen base on one or more of the following factors, the transmitter's level of unused power, the interference level at the transmitter and the position of the transmitter.
Description
The application relates to field of wireless communications, and the method and system of communication service particularly is provided for coverage hole (hole).
Usually cellular communication system is designed to have redundant component, to guarantee that communication service can not lost when a certain part fails.Each now uses the extra transceiver of transceiver this redundancy requirement, and each now uses the excess power amplifier of amplifier, and each now uses the extra controller of controller and the cost that all these extra (redundancy) parts have increased cellular communication system widely.According to present system, when transmitter or power amplifier break down, will use redundant transmitter till this fault sends function and fixed.This redundancy has also increased the maintenance and the cost of repairs.Used and redundant transmitter need be calibrated and safeguard periodically.If in cellular communication system, can reduce this redundant component, then will reduce honeycomb operator's commercial cost greatly.
A notion that proposes as solution in direct sequence CDMA (DS-CDMA) cellular communication system is that mesh is breathed (breathing).The notion that mesh is breathed is that this adjoining cells will be expanded, to fill up the covering space, till this fault transmitter (power amplifier) is repaired when a certain transmitter (power amplifier) in a specific mesh when breaking down.This scheme has caused really to disturb in this adjoining cells and has increased, till this transmitter is repaired.Simulation shows that this adjoining cells will be expanded when the mesh transmitter breaks down, but is not enough to eliminate the covering space.Fig. 1 shows the DS-CDMA cellular communication system 10 of a simulation." X " the 12nd has the scene, base station of non-directional transmitter." O " the 14th, existing with travelling carriage (portable equipment, subscriber unit).The mimic is placed on travelling carriage 14 in the cellular system 10 randomly.Line 16 defined the border of mesh and as every firm power (Ec) divided by all interfering energies (Io) or boundary line (Ec/Io), should (Ec/Io) can detect by travelling carriage in this place.Mesh border 16 and 18 is overlapping, to form soft handover area.If what happens when breaking down that Fig. 2 shows the transmitter of central base station 20.As what can see, around central base station 20, exist and cover space 22 from Fig. 2.Even the border 16 around mesh has been expanded, also exist and cover space 22.
A conspicuous solution for the covering space 22 of causing owing to the fault transmitter is the power that increases the adjoining cells transmitter.This scheme causes having increased from self the disturbing of all adjoining cells transmitters, and can not make and cover space 22 sealings.
Therefore, the invention provides a kind ofly can provide the method and system of communication service to covering the space, cancels in cellular communication system the needs to two cover transmitters thus.
The invention provides a kind of communication system and provide the method for communication service, may further comprise the steps to coverage hole:
(A) determine to have a plurality of base stations of the overlay area adjacent with this coverage hole;
(B) power amplifier that a plurality of base stations that will be adjacent with this coverage hole are associated is arranged on request formula power mode;
(C) from a plurality of base stations, choose a selected base station with overlay area adjacent with this coverage hole, choose be based in this selected base station not with the amount of transmitter power;
(D) determine whether a relative base station has the sufficient transmitter power amount of not using; With
(E) have sufficiently during when this relative base station, increase the pilot channel power of selected base station and this relative base station not with the transmitter power amount.
The present invention also provides a kind of cellular communication system that service can be provided to the coverage hole that is caused by the transmitter fault, and this system comprises:
A plurality of spread spectrum spectrum transmitters; With
Operation and administrative center (OMC), it and a plurality of base station communication, and any one fault in these a plurality of spread spectrums spectrum transmitters monitored; Wherein said OMC sends a signal, in order in a plurality of adjacent base stations any one is transformed into request formula power mode from the firm power mode; This OMC also comprises the device of the combined power level that is used for definite all adjacent base stations, and is used for from having a plurality of adjacent bast station lists of the combined power level that is lower than a threshold value, selects any one device in these a plurality of spread spectrums spectrum transmitters; Wherein this OMC sends a signal, composes the pilot channel power of the adjacent selected base station of transmitter in order to the spread spectrum that increases and break down, and wherein the quantity of selected base station is lower than and the adjacent base station number of spread spectrum spectrum transmitter that breaks down.
Provided by the inventionly eliminated needs in the DS-CDMA cellular communication system, reduced the acquisition expense and the maintenance cost of DS-CDMA cellular communication system two cover transmitters in order to the method and system of communication service to be provided for coverage hole.
Fig. 1 is the schematic diagram of direct sequence CDMA (DS-CDMA) cellular communication system;
Fig. 2 is the schematic diagram of direct sequence CDMA (DS-CDMA) cellular communication system that broken down of the transmitter of wherein central mesh;
Fig. 3 is the block diagram of a cellular communication system;
Fig. 4 is the figure that is illustrated in two transmitter power strategies in the DS-CDMA cellular communication system;
Fig. 5 is the schematic diagram of direct sequence CDMA (DS-CDMA) cellular communication system that broken down of the transmitter of wherein central mesh;
Fig. 6 is the schematic diagram of a cellular communication system;
Fig. 7 is the flow chart that the method for communication service is provided for coverage hole;
Fig. 8 is the flow chart that the other method of communication service is provided for coverage hole;
Fig. 9 is the flow chart that the another method of communication service is provided for coverage hole;
Figure 10 is the schematic diagram of direct sequence CDMA (DS-CDMA) cellular communication system that broken down of the transmitter of wherein central mesh.
Fig. 3 shows the block diagram of a typical cellular communication system 500.All aspects of 52 pairs of these cellular communication systems of OMC operation and maintenance centre (OMC) monitor and control.This OMC52 is connected to other parts of cellular communication system 500 by an exchange and control (Route Selection) system 54.Exchange and control system 54 are also connected to Public Switched Telephone Network 56 and a plurality of base station controller (BSC) 58.BSC 58 has a controller 60 and a plurality of code converter (XCDR) 62.Each BSC 58 is connected to a plurality of base station transceivers (BTS) 64.BTS 64 is set at the central and corresponding with " X " 12 of Fig. 1 of mesh usually.BTS 64 has a controller 68,72 and antennas 74 of a plurality of transceivers (receiver and transmitter) 70, one power amplifiers (PA).OMC 52 constantly monitors BTS 64, and BTS 64 constantly comprises the various information whether transmitter 70 or power amplifier 72 break down to the OMC52 report.
Fig. 4 illustrates, and has two kinds of strategies that are used to control DS-CDMA cellular communication system intermediate power amplifier 72.First kind of strategy is known as firm power strategy 90.Second kind of strategy is known as request formula power policy 92.Among the figure whole PA power outputs 94 are shown the longitudinal axis.The maximum power output of dotted line 96 expression PA.In firm power strategy 90, three parts have constituted the gross power of being used by PA.Use frequently by channel, paging channel and synchronizing channel by guiding for first group of power 98.Second group of power 100 is used by the practical business channel in using.The 3rd group of power 102 is used by the virtual service channel.Provide the mesh border of " constant " in the plan after the virtual service channel provides power.In request formula power policy 92, the virtual service channel power that do not run out.Fig. 5 shows from firm power mode shown in Figure 2 effect to the conversion of request formula power mode.As by checking what two figures can be seen, coverage hole 22 has dwindled, but still exists.
Fig. 6 shows has identical hexagon mesh and at a Utopian cellular communication system of the transmitter of the central authorities of each mesh.Shown mesh 120 does not have transmitter, breaks down with the transmitter in the expression mesh 120.A plurality of adjoining cells 122-132 with overlay area adjacent with the overlay area of fault transmitter have transmitter (base station BTS) 134-144.Mesh 122 and 128 is considered to relative mesh (BTS 134 and 140 is relative BTS) and this shows that mesh 124 and 130 is relative mesh, and mesh 132 and 126 is relative mesh.Utilize these to limit, can explain the scheme that communication service is provided to coverage hole shown in Figure 7.This process wherein determines that by OMC a transmitter breaks down in step 200 beginning.Then, this OMC determines and has one group of adjacent adjoining cells of fault transmitter mesh, and in step 202 transmitter of all adjoining cells is arranged on request formula power mode.Then in step 204, each adjoining cells is grouped into relative right.In step 206, determine each right relatively combination interference level and select to have the relative right of lowest interference level.Determine this interference level from the received signals intensity indication (RSSI) of base station.Can select this interference level to be mean value or the variance of this RSSI, or some other statistical measures of obtaining from RSSI.This RSSI is the indication of interference level among the DS-CDMA, because the DS-CDMA cellular communication system is a self-interference system.The frequency spectrum that Channel Sharing among the DS-CDMA is identical.In step 208, arrive and selectedly relatively the power of the pilot channel of transmitter is added to 3dB.Process described in Fig. 7 the travelling carriage in coverage hole is displaced to two mesh with optimum reception, thereby each mesh preferably can be held more user.This process can provide communication service to coverage hole, because only selected several transmitters (mesh) have increased their pilot channel power.The power that increases pilot channel has increased the scope of mesh.This pilot channel is the channel that travelling carriage is sought from the base station, whether can be used for communication to determine this base station.
Fig. 8 shows and is used to select a pair of relative transmitter to fill the replacement process that covers the space.This process selects to have the adjacent transmitter that maximum is not used PA power.If relative transmitter has and sufficient do not increase its conduct power 3dB with power, then select this that transmitter is filled this covering space.This process starts from step 220.In step 222, this process is waited for, is determined up to it whether transmitter breaks down.Then, in step 224, OMC determines all adjacent mesh of mesh of having broken down with transmitter wherein.In step 226, any adjoining cells that OMC will be in the firm power mode is transformed into request formula power mode.Then, in step 228, this OMC selects to have the maximum adjoining cells (transmitter) of not using transmitter power.Then, in step 230, this OMC determines whether the mesh relative with selected mesh has enough power and increase its pilot channel 3dB.When this relative mesh has sufficient power when improving its conduct power 3dB really, then in step 232, selected transmitter will be to arriving the power increase 3dB of its pilot channel.When this relative mesh does not have sufficient power when improving its conduct power to 3dB really, then determine whether selected to all mesh at this OMC of step 234.In step 234, when not every mesh had all been selected, in step 236, this OMC selected to have time maximum mesh of not using transmitter power.Handle then in step 230 and continue.In step 234, when all mesh have all been selected, select to have maximum at this OMC of step 238 and do not use the mesh of power combination right.Then, in step 240, this increases the power of their pilot channel to selected transmitter.
The 3rd replacement process shown in Fig. 9 has also added the part of two processes of Fig. 8 and Fig. 7.In step 260,, determine adjoining cells and each transmitter is arranged on request formula power mode at this OMC of step 262 in case transmitter breaks down.Then, in step 264, select to have the adjacent transmitter that maximum is not used transmitter power.Then, in step 266, this OMC determines whether the transmitter relative with this selected transmitter has sufficient power and increase its pilot channel 3dB.When the transmitter relative with this selected transmitter has sufficient power when increasing its pilot channel 3dB, in step 268, this OMC determines whether this selected with relative transmitter has the interference level that is lower than a predetermined threshold.When this selected with relative transmitter had the interference level that is lower than a predetermined threshold, then in step 270, this selected with relative transmitter increased its pilot channel 3dB.When selected or relative transmitter has when being higher than the interference level of (or equaling) predetermined threshold, then in step 272, this OMC selects to have time maximum transmitter of not using transmitter power.This process turns back to step 266 then.When the transmitter relative with this selected transmitter do not have sufficient power when increasing its pilot channel 3dB, then in step 274, this OMC determines whether all adjacent transmitters all to have been selected.In step 274, when not every adjacent transmitter had all been selected, then this process continued in step 272.When all adjacent transmitters of step 274 have all been selected, select to have maximum at this OMC of step 278 and do not use the relative transmitter of power combination right.Then, process continues in step 270.
Figure 10 is the simulation of Fig. 9 process.As what can from figure, see, be that clearly coverage hole 22 has been capped in Fig. 2 and Fig. 5.Therefore, the invention provides the method and system that communication service is provided for coverage hole in the DS-CDMA cellular communication system.The present invention to the demand of two cover transmitters and power amplifier, makes the maintenance that the honeycomb operator has reduced its initial capital investment and carried out by cancellation.
Though invention has been described in conjunction with specific embodiment, apparent, according to above-mentioned description, many replacements, improving and changing is tangible for a person skilled in the art.For example, the present invention who uses omnidirectional's transmitter is described, but can easily it be improved to the subregion transmitter work of using.And, though invention has been described in conjunction with the DS-CDMA cellular communication system, can apply it to equally in frequency hopping or other spread spectrum cellular systems.Therefore, the present invention will improve and be out of shape being considered as dropping in the spirit and scope of the application's claims to all such replacements.
Claims (9)
1. a communication system provides the method for communication service to coverage hole, and this method may further comprise the steps:
(A) determine to have a plurality of base stations of the overlay area adjacent with this coverage hole;
(B) power amplifier that a plurality of base stations that will be adjacent with this coverage hole are associated is arranged on request formula power mode;
(C) from a plurality of base stations, choose a selected base station with overlay area adjacent with this coverage hole, choose be based in this selected base station not with the amount of transmitter power;
(D) determine whether a relative base station has the sufficient transmitter power amount of not using; With
(E) have sufficiently during when this relative base station, increase the pilot channel power of selected base station and this relative base station not with the transmitter power amount.
2. according to the method for claim 1, it is characterized in that, further comprising the steps of:
(F) do not have sufficient during when this relative base station not with the transmitter power amount, from a plurality of base stations, choose one and replace the base station as selected base station with overlay area adjacent with this coverage hole, choose be based in this replacement base station not with the amount of transmitter power; With
(G) begin repetition from step (D).
3. according to the method for claim 1, it is characterized in that, step (E) also comprises when this relative base station having the sufficient transmitter power amount of not using, and when the two interference level of relative base station with this, this selected base station is lower than a threshold value, increase the step of the pilot channel power of this selected base station and this relative base station.
4. according to the method for claim 3, also comprise step:
(F) when selected base station when any one interference level in the relative base station is higher than this threshold value, from a plurality of base stations, choose one and replace the base station with overlay area adjacent with this coverage hole, as selected base station, wherein choose the amount of transmission power of not using that is based in this replacement base station;
(G) begin repetition from step (D).
5. cellular communication system that service can be provided to the coverage hole that causes by the transmitter fault, this system comprises:
A plurality of spread spectrum spectrum transmitters; With
Operation and administrative center (OMC), it and a plurality of base station communication, and any one fault in these a plurality of spread spectrums spectrum transmitters monitored; Wherein said OMC sends a signal, in order in a plurality of adjacent base stations any one is transformed into request formula power mode from the firm power mode; This OMC also comprises the device of the combined power level that is used for definite all adjacent base stations, and is used for from having a plurality of adjacent bast station lists of the combined power level that is lower than a threshold value, selects any one device in these a plurality of spread spectrums spectrum transmitters; Wherein this OMC sends a signal, composes the pilot channel power of the adjacent selected base station of transmitter in order to the spread spectrum that increases and break down, and wherein the quantity of selected base station is lower than and the adjacent base station number of spread spectrum spectrum transmitter that breaks down.
6. according to the cellular communication system of claim 5, before wherein in these a plurality of spread spectrum spectrum transmitters breaks down, determine selected base station.
7. according to the cellular communication system of claim 5, wherein this OMC does not determine selected base station with power capacity based on power amplifier, and concurrent feed signals is to increase the power of pilot channel.
8. according to the cellular communication system of claim 5, wherein this OMC to each base station rankings in the adjacent base station group, and according to the grade of base station, selects a base station in this group, in order to the power of increase pilot channel according to the power of not using power amplifier.
9. according to the cellular communication system of claim 5, wherein this OMC has the device of the child group of the adjacent base station group that definite combination interference level is lower than threshold value, and the device of pilot signal power that is used to increase at least one height group of this adjacent base station group.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42101295A | 1995-04-12 | 1995-04-12 | |
| US08/421,012 | 1995-04-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1155964A CN1155964A (en) | 1997-07-30 |
| CN1084131C true CN1084131C (en) | 2002-05-01 |
Family
ID=23668823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96190325A Expired - Lifetime CN1084131C (en) | 1995-04-12 | 1996-03-15 | Method and system for providing communications service to a coverage hole |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100249333B1 (en) |
| CN (1) | CN1084131C (en) |
| DE (1) | DE69636535T2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790866B (en) * | 2016-03-31 | 2018-07-24 | 中国联合网络通信集团有限公司 | Base station rankings method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435840A (en) * | 1981-06-22 | 1984-03-06 | Nippon Electric Co., Ltd. | Radio mobile communication system wherein probability of loss of calls is reduced without a surplus of base station equipment |
| US5023900A (en) * | 1989-12-07 | 1991-06-11 | Tayloe Daniel R | Cellular radiotelephone diagnostic system |
| US5285443A (en) * | 1992-08-25 | 1994-02-08 | Motorola, Inc. | Method and apparatus for synchronizing a time division duplexing communication system |
-
1996
- 1996-03-15 CN CN96190325A patent/CN1084131C/en not_active Expired - Lifetime
- 1996-03-15 KR KR1019960707086A patent/KR100249333B1/en not_active IP Right Cessation
- 1996-03-15 DE DE69636535T patent/DE69636535T2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435840A (en) * | 1981-06-22 | 1984-03-06 | Nippon Electric Co., Ltd. | Radio mobile communication system wherein probability of loss of calls is reduced without a surplus of base station equipment |
| US5023900A (en) * | 1989-12-07 | 1991-06-11 | Tayloe Daniel R | Cellular radiotelephone diagnostic system |
| US5285443A (en) * | 1992-08-25 | 1994-02-08 | Motorola, Inc. | Method and apparatus for synchronizing a time division duplexing communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69636535D1 (en) | 2006-10-26 |
| KR970704316A (en) | 1997-08-09 |
| CN1155964A (en) | 1997-07-30 |
| DE69636535T2 (en) | 2006-12-28 |
| KR100249333B1 (en) | 2000-03-15 |
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Owner name: MOTOROLA MOBILE CO., LTD. Free format text: FORMER OWNER: MOTOROLA INC. Effective date: 20101230 |
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Effective date of registration: 20101230 Address after: Illinois Instrunment Patentee after: Motorola Mobility LLC Address before: Illinois Instrunment Patentee before: Motorola Inc. |
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