CN1497990A - Mobile communication system, mobile communication method and radio station used for them - Google Patents
Mobile communication system, mobile communication method and radio station used for them Download PDFInfo
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- CN1497990A CN1497990A CNA2003101000960A CN200310100096A CN1497990A CN 1497990 A CN1497990 A CN 1497990A CN A2003101000960 A CNA2003101000960 A CN A2003101000960A CN 200310100096 A CN200310100096 A CN 200310100096A CN 1497990 A CN1497990 A CN 1497990A
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Abstract
The object of the present invention is provide a mobile communication system which can improve a communication quality of the mobile communication system as a whole by changing a transmission method for transmitting common information. Each of the mobile stations (200a) to (200l) comprises a communication quality measurer (230) configured to measure a communication quality of a signal transmitted from the radio station (100a). The radio station (100a) comprises a communication quality acquirer (130) configured to acquire the communication quality from the plurality of mobile stations (200a) to (200l); a transmission method changer (140) configured to change a transmission method for at least one of an error encoding rate, the number of repeated bits, an interleave length, the number of multiple codes and the number of transmission signal repetitions, in accordance with the acquired communication quality; and a transmitter (110) configured to transmit the signal to the plurality of mobile stations (200a) to (200l) using the changed transmission method.
Description
The cross reference of related application
The application is based on the P2002-292792 of Japanese patent application No. formerly of on October 4th, 2002 application and the P2002-321870 of application on November 5th, 2002, and requires its priority; Herein as a reference in conjunction with its whole contents.
Technical field
The present invention relates to realize the mobile communication system of multiple access communication, a kind of method of mobile communication, and the radio station that is used for them by a radio station (radio control unit or a base station) and a plurality of mobile radio station
Particularly, the present invention relates to a kind of mobile communication system of utilizing certain base station emission common information to a plurality of mobile radio stations, a kind of method of mobile communication and the radio station that is applicable to them.
Background technology
As shown in Figure 1, in traditional mobile communication system, it is known utilizing one or more base station 100a to 100g once to launch common information broadcast communication of all unspecified travelling carriage 200a to 2001 in the presumptive area 300a to 300g.
As shown in Figure 2, it is known utilizing one or more base station 100a to 100g once to launch the multiple access communication that common information is connected a plurality of travelling carriages of (belonging to) specific basic group in the presumptive area 300a to 3001 in traditional mobile communication system.
Yet problem is that the communication quality of each travelling carriage is all different, and therefore some travelling carriage place can not satisfy required communication quality in traditional mobile communication system.
For example, the travelling carriage near the base station can obtain better communication quality than other travelling carriages.Yet, to compare with travelling carriage near the base station, other travelling carriages can only obtain disappointing communication quality.
In other words, the problem of existence is that communication quality changes according to the locational relation between each travelling carriage in base station and this same area, and therefore communication quality is skimble-scamble between travelling carriage.Therefore, need a kind of mobile communication system of exploitation, it provides required communication quality can for all travelling carriages in this same area.
Summary of the invention
In view of described above, the purpose of this invention is to provide a kind of mobile communication system, by considering that the balance that communicates quality between travelling carriage changes the transmission method that is used to launch common information, it can make the communication quality of each travelling carriage near required communication quality, and integrally improve the communication quality of this mobile communication system, and a kind of method of mobile communication and the radio station that is applicable to them are provided.
First aspect of the present invention can be summarized as a kind of mobile communication system, and it carries out multiple access communication by a radio station and a plurality of travelling carriage.
Each travelling carriage comprises the measurement of communication quality device that is used to measure from the communication quality of the signal of this radio station's emission;
This radio station comprises: a communication quality grabber is used to obtain the communication quality from a plurality of travelling carriages; A transmission method converter is used for changing at least one transmission method of the error rate, repetition bits quantity, weaving length, quantity and repetition bits quantity according to acquired communication quality; And a reflector is used to utilize altered transmission method to transmit signals to a plurality of travelling carriages.
Second aspect of the present invention can be summarized as a kind of radio station, is used for carrying out multiple access communication with a plurality of travelling carriages.
This radio station comprises: a communication quality grabber is used to obtain from the communication quality of a plurality of travelling carriages by the signal of this multiple access communication emission; A transmission method converter is used for changing at least one transmission method of the error rate, repetition bits quantity, weaving length, multi-code quantity and transmission signals number of iterations according to acquired communication quality; And a reflector is used to utilize altered transmission method to transmit signals to a plurality of travelling carriages.
According to second aspect, the communication quality grabber can be selected minimum communication quality from the communication quality that obtains, and the transmission method converter can change transmission method according to the communication quality according to the minimum of selecting.
According to second aspect, the communication quality grabber can calculate from the mean value of the communication quality of a plurality of travelling carriages acquisitions, and the transmission method converter can change transmission method according to the difference between mean value that calculates and the predetermined reference value.
According to second aspect, this radio station may further include a radio resource manager, be used for the situation of managing radio resources, and the transmission method converter can change transmission method according to the situation of acquired communication quality and radio resource.
According to second aspect, communication quality can comprise at least one in received power, signal error rate, interference signal level and the signal to noise ratio.
The 3rd aspect of the present invention can be summarized as a kind of method of mobile communication, and it carries out multiple access communication by a radio station and a plurality of travelling carriage.
This method comprises the steps: (A) in each travelling carriage, measures from the communication quality of the signal of this radio station's emission; (B) in this radio station, obtain communication quality from a plurality of travelling carriages; (C) in this radio station, change in the error rate, repetition bits quantity, weaving length, multi-code quantity and the transmission signals number of iterations transmission method of at least one according to acquired communication quality; And (D) in this radio station, utilize altered transmission method to transmit signals to this a plurality of travelling carriages.
Description of drawings
Fig. 1 is a schematic diagram, has shown the total of a kind of mobile communication system that is used to carry out broadcast communication in the prior art.
Fig. 2 is a schematic diagram, has shown the total of a kind of mobile communication system that is used to carry out multiple access communication in the prior art.
Fig. 3 is a schematic diagram, has shown the functional module according to the mobile communication system of one embodiment of the invention.
Fig. 4 is a schematic diagram, has shown the stored contents that is used for according to the communication quality database of the mobile communication system of the embodiment of the invention.
Fig. 5 is the flow chart of demonstration according to the operation of the mobile communication system of the foregoing description.
Embodiment
＜according to the structure of the mobile communication system of an embodiment of the present invention 〉
Below with reference to describing according to a kind of mobile communication system of the present invention.Fig. 3 is the structural representation according to the mobile communication system of one embodiment of the invention.
Mobile communication system according to this embodiment is carried out multiple access communication (comprising broadcast communication), and wherein, base station 100a to 100g emission common information arrives the mobile radio station 200a to 2001 in the regional 300a to 300g.Herein, regional 300a to 300g is managed by base station 100a to 100g respectively.
In this embodiment, base station 100a to 100g can launch common information to the mobile radio station 200a to 2001 that is connected to the predetermined multiple access communication basic group among (belonging to) a plurality of regional 300a to 300g.
And in this embodiment, base station 100a can launch common information to the travelling carriage 200a that is connected to the predetermined multiple access communication basic group among the single area 300a.To under first prerequisite, present embodiment be described below.Yet the present invention can certainly be adapted under second kind of situation.
Because the function of mobile radio station 200a to 2001 is identical basically, only describes the function of travelling carriage 200a below.The function of base station 100a to 100g is identical basically, therefore only describes the function of base station 100a below.
In this embodiment, show that travelling carriage 200a is configured with one and transmits and receives unit 210, a control unit 220 and a measurement of communication quality unit 230 as Fig. 3.
Transmit and receive unit 210 be used for to/from base station 100a to 100g transmitting/receiving signal.
Particularly, transmitting and receiving unit 210 receives from the signal of base station 100a to 100g emission.The communication quality that transmits and receives the signal that will be measured by measurement of communication quality unit 230 unit 210 is transmitted into base station 100a to 100g.
Measurement of communication quality unit 230 is used to measure the communication quality from the signal of base station 100a to 100g emission.In this embodiment, this communication quality comprises received power, signal error rate, interference signal level and signal to noise ratio (SIR) at least.
As shown in Figure 3, measurement of communication quality unit 230 is configured with a received power measuring unit 231, signal error rate measuring unit 232, an interference signal level measuring unit 233 and a signal-interference ratio measurement unit 234.Measurement of communication quality unit 230 can comprise all these functions, perhaps one of these functions.
Received power measuring unit 231 is used to measure the received power from the signal of base station 100a to 100g reception.
Signal error rate measuring unit 232 is used to measure the signal error rate from the signal of base station 100a to 100g reception.
Interference signal level measuring unit 233 is used for measuring the level of the interference signal that is included in each signal that receives from base station 100a to 100g.Herein, interference signal level comprise level from the interference signal of base station 100a to 100g, from level of the interference signal of other mobile radio stations 200b to 2001 or the like.
Signal-interference ratio measurement unit 234 is used to measure from the signal of each base station 100a to 100g acquisition and the ratio (SIR: signal to noise ratio) of interference signal level.
Measurement of communication quality unit 230 transmits and receives unit 110 by transmitting and receiving unit 210 with what the communication quality of measuring was transmitted into base station 100a to 100g.
As shown in Figure 3, base station 100a is configured with and transmits and receives unit 110, communication quality database 120, communication quality acquiring unit 130, transmission method and change unit 140, a transmit information data storehouse 150 and a radio resource management units 160.
Transmit and receive unit 110 utilize by transmission method change transmission method that unit 140 changes to/from mobile radio station 200a to 2001 transmitting/receiving signal.In addition, transmit and receive unit 110 be used for to/from radio network controller 50 transmitting/receiving signals.
Particularly, transmitting and receiving unit 110 receptions is stored in the communication quality database 120 from the communication quality of each mobile radio station 200a to 2001 emission and with the communication quality that receives.Herein, communication quality is measured by the measurement of communication quality unit 230 of each mobile radio station 200a to 2001.
Particularly, as shown in Figure 4, " received power (50dBm ;-45dBm ,-45dBm or the like) " of communication quality database 120 storage mobile radio station 200a to 2001, " the signal error rate (0.001%; 0.002%; 0.003% or the like) ", " interference signal level (110 ,-130 ;-110 or the like) ", and " signal to noise ratio (11,12,13 or the like) ".
Communication quality acquiring unit 130 is used for obtaining the communication quality that is stored in communication quality database 120, and this communication quality is transmitted into transmission method change unit 140.
Particularly, communication quality acquiring unit 130 query communication quality databases 120 are thought in a plurality of at least communication qualities of the mobile station in selecting that is connected to a specific multiple access communication basic group, and export selected communication quality to transmission method change unit 140.
Herein, communication quality acquiring unit 130 can be selected a predetermined communication quality, for example " received power ", " signal error rate ", " interference signal level ", or " signal to noise ratio " in the communication quality from be stored in communication quality database 120.
Communication quality acquiring unit 130 can be selected the communication quality of a predetermined travelling carriage, for example is connected the communication quality of the travelling carriage in the specific multiple access communication basic group.
For example, when selecting " received power " as communication quality, communication quality acquiring unit 130 select from be connected this specific multiple access communication basic group the corresponding received power of each mobile radio station among select the highest (maximum) or minimum (minimum) received power, and the ID of selected received power and the travelling carriage corresponding with this selected received power outputed to transmission method change unit 140.
Communication quality acquiring unit 130 can calculate the mean value of the received power that is connected the mobile radio station in this specific multiple access communication basic group, and mean value that calculates and the ID that is connected the mobile radio station in this specific multiple access communication basic group are outputed to transmission method change unit 140.
Have only when the mean value that calculates surpasses predetermined value, communication quality acquiring unit 130 just can output to transmission method with the ID that is connected the mobile radio station in this specific multiple access communication basic group with this mean value and change unit 140.
Communication quality acquiring unit 130 can calculate the variation of the minimum value received power of selecting among the received power of the mobile radio station from be connected this specific multiple access communication basic group in the predetermined cycle, and the ID of variation that will calculate and the travelling carriage corresponding with this minimum received power outputs to transmission method and changes unit 140.
Have only when this variation surpasses predetermined value, communication quality acquiring unit 130 just can output to this variation transmission method and change unit 140.
This communication quality acquiring unit 130 can this mean value or minimum received power be set to fiducial value, and received power and difference between this fiducial value be positioned at the received power of preset range and output to transmission method with the ID of the corresponding travelling carriage of this received power change unit 140.
Communication quality acquiring unit 130 can this mean value or minimum received power be set to fiducial value, and will utilize the ID of the travelling carriage that optional method extracts according to this fiducial value and the received power of the travelling carriage that extracted outputs to transmission method change unit 140.
For example, communication quality acquiring unit 130 can extract: N the travelling carriage of selecting from the travelling carriage of minimum received power to sequence; N the travelling carriage that sequence ground is selected the travelling carriage near mean value from its received power; Travelling carriage with N minimum received power.
In addition, have only when the time with the quantity a predetermined level is exceeded of this received power corresponding mobile station, the ID that this communication quality acquiring unit 130 just can be exported this received power and the travelling carriage corresponding with this received power changes unit 140 to transmission method, and the difference of wherein said received power and fiducial value is in the scope of being scheduled to.
For example, when selecting " signal error rate " as communication quality, communication quality acquiring unit 130 select from be connected this specific multiple access communication basic group the corresponding signal error rate of each mobile radio station among select the highest (maximum) or minimum (minimum) signal error rate, and the ID of selected signal error rate and the travelling carriage corresponding with this selected signal error rate outputed to transmission method change unit 140.
Communication quality acquiring unit 130 can calculate the mean value of the signal error rate that is connected the mobile radio station in this specific multiple access communication basic group, and mean value that calculates and the ID that is connected the mobile radio station in this specific multiple access communication basic group are outputed to transmission method change unit 140.
Have only when the mean value that calculates surpasses predetermined value, communication quality acquiring unit 130 just can output to transmission method with the ID that is connected the mobile radio station in this specific multiple access communication basic group with this mean value and change unit 140.
Communication quality acquiring unit 130 can calculate the variation of the minimum value signal error rate of selecting among the signal error rate of the mobile radio station from be connected this specific multiple access communication basic group in the predetermined cycle, and the ID of variation that will calculate and the travelling carriage corresponding with this minimum signal error rate outputs to transmission method and changes unit 140.
Have only when this variation surpasses predetermined value, communication quality acquiring unit 130 just can output to this variation transmission method and change unit 140.
This communication quality acquiring unit 130 can this mean value or the minimum signal error rate be set to fiducial value, and signal error rate and difference between this fiducial value be positioned at the signal error rate of preset range and output to transmission method with the ID of the corresponding travelling carriage of this signal error rate change unit 140.
Communication quality acquiring unit 130 can this mean value or minimum signal error rate be set to fiducial value, and will utilize the ID of the travelling carriage that optional method extracts according to this fiducial value and the signal error rate of the travelling carriage that extracted outputs to transmission method change unit 140.
For example, communication quality acquiring unit 130 can extract: N the travelling carriage of selecting from the travelling carriage of minimum signal error rate to sequence; N the travelling carriage that sequence ground is selected the travelling carriage near mean value from its signal error rate, the travelling carriage with signal error rate of N minimum.
In addition, have only when the time with the quantity a predetermined level is exceeded of this signal error rate corresponding mobile station, the ID that this communication quality acquiring unit 130 just can be exported this signal error rate and the travelling carriage corresponding with this signal error rate changes unit 140 to transmission method, and the difference of wherein said signal error rate and fiducial value is in the scope of being scheduled to.
Communication quality acquiring unit 130 can calculate the mean value of the interference signal level that is connected the mobile radio station in this specific multiple access communication basic group, and mean value that calculates and the ID that is connected the mobile radio station in this specific multiple access communication basic group are outputed to transmission method change unit 140.
Have only when the mean value that calculates surpasses predetermined value, communication quality acquiring unit 130 just can output to transmission method with the ID that is connected the mobile radio station in this specific multiple access communication basic group with this mean value and change unit 140.
Communication quality acquiring unit 130 can calculate the variation of least interference signal level in the scheduled period of selecting among the interference signal level of the travelling carriage from be connected specific multiple access communication basic group, and the least interference signal level that calculates is outputed to transmission method change unit 140.
Have only when this variation surpasses predetermined value, communication quality acquiring unit 130 just can output to this variation transmission method and change unit 140.
Communication quality acquiring unit 130 can this mean value or minimum interference signal level be set to fiducial value, and will with difference between this fiducial value in preset range interference signal level and output to transmission method with the ID of the corresponding travelling carriage of this interference signal level and change unit 140.
Communication quality acquiring unit 130 can this mean value or minimum interference signal level be set to fiducial value, and will utilize the ID of the travelling carriage that optional method extracts according to this fiducial value and the interference signal level of the travelling carriage that extracted outputs to transmission method change unit 140.
For example, communication quality acquiring unit 130 can extract: N the travelling carriage of selecting from the travelling carriage of least interference signal level by sequence ground; N the travelling carriage of selecting the travelling carriage near mean value from its interference signal level by sequence ground; Travelling carriage with N least interference signal level.
In addition, have only when the time with the quantity a predetermined level is exceeded of this interference signal level corresponding mobile station, the ID that this communication quality acquiring unit 130 just can be exported this interference signal level and the travelling carriage corresponding with this interference signal level changes unit 140 to transmission method, and the difference of wherein said interference signal level and fiducial value is in the scope of being scheduled to.
For example, when selecting " signal to noise ratio " as communication quality, communication quality acquiring unit 130 select from be connected this specific multiple access communication basic group the corresponding signal to noise ratio of each mobile radio station among select the highest (maximum) or minimum (minimum) signal to noise ratio, and the ID of selected signal to noise ratio and the travelling carriage corresponding with this selected signal to noise ratio outputed to transmission method change unit 140.
Communication quality acquiring unit 130 can calculate the mean value of the signal to noise ratio that is connected the mobile radio station in this specific multiple access communication basic group, and mean value that calculates and the ID that is connected the mobile radio station in this specific multiple access communication basic group are outputed to transmission method change unit 140.
Have only when the mean value that calculates surpasses predetermined value, communication quality acquiring unit 130 just can output to transmission method with the ID that is connected the mobile radio station in this specific multiple access communication basic group with this mean value and change unit 140.
Communication quality acquiring unit 130 can calculate the variation of minimum value signal to noise ratio in the scheduled period of selecting among the signal to noise ratio of the mobile radio station from be connected this specific multiple access communication basic group, and the ID of variation that will calculate and the travelling carriage corresponding with this minimum signal to noise ratio outputs to transmission method and changes unit 140.
Have only when this variation surpasses predetermined value, communication quality acquiring unit 130 just can output to this variation transmission method and change unit 140.
Communication quality acquiring unit 130 can this mean value or minimum signal to noise ratio be set to fiducial value, and will with difference between this fiducial value in preset range signal to noise ratio and output to transmission method with the ID of the corresponding travelling carriage of this signal to noise ratio and change unit 140.
For example, communication quality acquiring unit 130 can extract: N the travelling carriage of selecting from the travelling carriage of minimum signal to noise ratio by sequence ground; N the travelling carriage of selecting the travelling carriage near mean value from its signal to noise ratio by sequence ground; Travelling carriage with N minimum signal to noise ratio.
In addition, have only when the time with the quantity a predetermined level is exceeded of this signal to noise ratio corresponding mobile station, the ID that this communication quality acquiring unit 130 just can be exported this signal to noise ratio and the travelling carriage corresponding with this signal to noise ratio changes unit 140 to transmission method, and the difference of wherein said signal to noise ratio and fiducial value is in the scope of being scheduled to.
Communication quality acquiring unit 130 can calculate the mean value of communication quality based on the communication quality that obtains from travelling carriage 200a to 2001, and the mean value that calculates and the difference between the pre-determined reference value are outputed to transmission method changes unit 140.
Transmission method changes unit 140 and is arranged to according to the communication quality from 130 outputs of communication quality acquiring unit and changes the quantity of quantity, weaving length, multi-code of the bit of the error rate, repetition and at least one the transmission method the quantity that transmission signals repeats.
When transmission method changes unit 140 when communication quality acquiring unit 130 receives minimum or the highest communication quality, this transmission method changes unit 140 and changes transmission method according to the communication quality that receives.
Under such a case, 140 orders of transmission method change unit transmit and receive the unit altered transmission method of 110 usefulness and transmit signals to the travelling carriage 200a to 2001 with minimum or maximum communication quality.
In case receive the mean value of communication quality from communication quality acquiring unit 130, just calculate the difference between this mean value and the pre-determined reference value, and change transmission method according to the difference that calculates.
Under such a case, 140 orders of transmission method change unit transmit and receive the unit altered transmission method of 110 usefulness and transmit signals to travelling carriage 200a to 2001.
Particularly, transmission method changes the unit and changes the error rate according to the communication quality from 130 emissions of communication quality acquiring unit.
Usually, being added to one such as the error correcting code of convolution code or Turbo code and so on as redundant digit transmits.Therefore, the error rate by " signal/(signal+redundant digit) " and calculated.
For example, when two redundant digits (error correcting code) were added to a bit signal, the error rate became 1/3.
When the error rate increased, signal length was shortened, but the ability of correction error is reduced.On the other hand, when the error rate was reduced, it is longer that signal length becomes, but the ability of correction error increases.
Based on the communication quality from 130 emissions of communication quality acquiring unit, transmission method changes unit 140 and uses above-mentioned principle to reduce the error rate of the travelling carriage of low communication quality, and increases the error rate of the travelling carriage of high communication quality.
For example, when from the ID of communication quality acquiring unit 130 minimum received powers of output and the travelling carriage 200 corresponding with this minimum received power, transmission method changes unit 140 and specifies these travelling carriages 200.Herein, for example, when the travelling carriage 200 in appointment did not obtain required received power, transmission method changed unit 140 and reduces the error rate that is connected all the travelling carriage 200a to 200l in the specific multiple access communication basic group.
When from the ID of the highest received power of communication quality acquiring unit 130 output and the travelling carriage 200 corresponding with this highest received power, transmission method changes unit 140 and specifies these travelling carriages 200.Herein, for example, when the communication quality of the travelling carriage 200 of appointment was equal to or higher than required communication quality, transmission method changed unit 140 and increases the error rate that is connected all the travelling carriage 200a to 200l in the specific multiple access communication basic group.
Transmission method changes the quantity that unit 140 can change repetition bits according to the communication quality from 130 outputs of communication quality acquiring unit.
This repetition bits is meant based on given rule and repeatedly adds to the bit that goes in the signal that will be launched.That is, this repetition bits means the bit that is used to reduce error code.
When the quantity of repetition bits increased, it is longer that signal length becomes, but the ability of correction error increases.On the contrary, when the quantity of repetition bits reduced, signal length shortened, but the ability of correction error increases.
Based on communication quality from the travelling carriage 200 of communication quality acquiring unit 130 emission, when communication quality when low, transmission method changes unit 140 and uses above-mentioned principle to add more repetition bits, and when communication quality when being high, then reduces the quantity of repetition bits.
Transmission method changes unit 140 can change weaving length according to the communication quality from 130 outputs of communication quality acquiring unit.
Usually, when weaving length is long,, utilize the ability of the correction error of error correcting code to increase for the error code of bursting.
Based on communication quality from the travelling carriage 200 of communication quality acquiring unit 130 emission, when communication quality when low, transmission method changes unit 140 and uses above-mentioned principle this weaving length that extends, and when communication quality when being high, then shortens weaving length.
As a result, when the emission prearranged signal, transmission method changes unit 140 can strengthen real-time performance.
Transmission method changes the quantity that unit 140 can change multi-code according to the communication quality from 130 outputs of communication quality acquiring unit.
100 places in the base station, with code division multiple access (CDMA) mode signal is being carried out under the multiplexed situation, quantity as multiple access (CDMA), when the quantity of the multi-code of the multiplexed common information of launching in multiple access communication increases, the bit number of launching increases, and therefore can add how new redundant bit.
On the other hand, signal outside the common information for example voice or other data by the code division multiple access mode with common information when multiplexed, distribute to other professional code quantities or other business itself are not carried out multiplexedly by minimizing, communication quality can be improved in base station 100.
Based on communication quality from the travelling carriage 200 of communication quality acquiring unit 130 emission, when communication quality when low, transmission method changes unit 140 and uses above-mentioned principle to increase the quantity of multi-code, and when communication quality when being high, then reduces the quantity of multi-code.Therefore, when the emission prearranged signal, can utilize enough resources, and can be modified at the communication quality at each travelling carriage 200a to 2001 place.
Transmission method changes unit 140 can change the quantity that transmission signals repeats according to the communication quality from 130 outputs of communication quality acquiring unit.
Base station 100 can transmit signals to travelling carriage 200 so that correctly launch this by transmitting and receiving unit 110 signal (transmission signals) that emission will be launched in each given circulation repeatedly.
As a result, base station 100 can increase the redundancy of information by the quantity that increases the transmission signals repetition, so this travelling carriage 200 can correctly receive the information of 100 emissions from the base station and further improve communication quality.
Communication quality based on the travelling carriage of exporting from communication quality acquiring unit 130 200, when communication quality when low, transmission method changes unit 140 and uses above-mentioned principle to increase the quantity that transmission signals repeats, and when communication quality when being high, then reduces the quantity of transmission signals repetition.
The result, communication quality based on the travelling carriage of exporting from communication quality acquiring unit 130 200, by increasing or reduce the quantity that transmission signals repeats, transmission method changes unit 140 can adjust the communication quality that is connected all travelling carriages in the specific multiple access communication basic group.
When the mean value of the received power that is connected a travelling carriage in the specific multiple access communication basic group surpasses predetermined value, and when this mean value was received by communication quality acquiring unit 130, this transmission method changed the quantity that unit 140 could change quantity, weaving length or the multi-code of the error rate, repetition bits according to this mean value.
The result, transmission method changes unit 140 can accurately change method for transmitting signals according to the communication quality that is connected a plurality of travelling carriages in the specific multiple access communication basic group, so this transmission method change unit 140 can utilize altered method for transmitting signals adjustment to be connected the communication quality of all travelling carriages 200 in this specific multiple access communication basic group.
Transmission method changes unit 140 can use one or more in error rate transmission method, repetition bits quantity, weaving length, multi-code quantity or the like, therefore, this transmission method change unit 140 can utilize a plurality of transmission methods to adjust the communication quality of all travelling carriages 200.
Based on communication quality with by the state of the radio resource of radio resource management units 160 management, transmission method changes unit 140 can change transmission method.
Transmit information data storehouse 150 is arranged to the signal that storage will be launched into travelling carriage.
Radio resource management units 160 is configured to the situation of managing radio resources.For example, radio resource management units 160 management are by the radio resource of the management of the base station 100a among the regional 300a, current effective radio resource in this zone (for example quantity of radio channel or transmitted power).
So that present embodiment is described, wherein the base station is provided with and transmits and receives unit 110, communication quality database 120, the change of communication quality acquiring unit 130 transmission methods unit 140, transmit information data storehouse 150 and radio resource management units 160 by example.
Yet, the present invention is not limited thereto example.All functions may be provided for radio network controller 50.As selection, part of functions can be provided for radio network controller 50, and remaining function can be provided for base station 100a.
(operation of the mobile communication system of this embodiment)
Operation with mobile communication system of aforementioned structure will be described with reference to Figure 5.Fig. 5 is the flow chart of demonstration according to the operation of the mobile communication system of the foregoing description.
As shown in Figure 5, at step S101, the communication 230 of each travelling carriage 200a to 2001 is measured from the communication quality of the signal of base station 100a reception.
Then, the communication quality of the communication measurement unit 230 of each travelling carriage 200a to 2001 by transmitting and receiving unit 210 emission measurements transmits and receives unit 110 to base station 100a.
In step S102, the unit 110 of transmitting and receiving of base station 100a obtains the communication quality measured by travelling carriage 200a to 2001, to be stored in the communication quality database 120.
Communication quality acquiring unit 130 is selected a communication quality (for example " received power ") from a plurality of communication qualities, and selected communication quality is outputed to transmission method change unit 140.
For example, communication quality acquiring unit 130 is selected minimum received power or similar received power among the received power corresponding with being connected travelling carriage the specific multiple access communication basic group, and the minimum received power that will select outputs to transmission method change unit 140.
In step S103, the communication quality that transmission method change unit 140 bases are exported from communication quality acquiring unit 130 changes at least one the error rate, repetition bits quantity, weaving length, multi-code quantity and the transmission signals number of iterations, and they are used as transmission method.
For example, when the mean value of the received power that receives from communication quality acquiring unit 130 surpassed predetermined value, this transmission method changed unit 140 and just changes the error rate, repetition bits quantity, weaving length or multi-code quantity according to the grade of the communication quality of this travelling carriage 200.
In step S104, transmit and receive unit 110 and utilize altered transmission method to transmit to travelling carriage 200 (for example being connected the travelling carriage in this specific multiple access communication basic group).(according to the function and the effect of the mobile communication system of present embodiment)
Mobile communication system according to present embodiment, transmission method change unit 140 changes the transmission method that comprises error rate or the like according to the communication quality of each travelling carriage 200a to 2001, therefore, for the signal that will be launched, consider the balance of communication quality among the travelling carriage 200a to 2001, can determine its transmission method.
The mobile communication system of present embodiment, transmission method changes unit 140 can select minimum communication quality among the communication quality of travelling carriage 200a to 2001, and can change transmission method according to selected communication quality, therefore just might improve the communication quality of the travelling carriage 200 that can not satisfy required communication quality.
Mobile communication system according to present embodiment, transmission method changes unit 140 and select the highest communication quality among the communication quality of travelling carriage 200a to 2001, and can change transmission method according to selected communication quality, therefore can prevent the communication quality of excessive travelling carriage, and might improve total communication quality of the travelling carriage 200 in being different from other zones of travelling carriage 200a to 2001 region, and predetermined reference value, and can change transmission method according to the difference that calculates, therefore just might adjust the communication quality that is connected all the travelling carriage 200a to 200l in the multiple access communication basic group.
As mentioned above, by considering that the balance of communication quality changes the transmission method that is used to launch common information between the travelling carriage, the present invention can make the communication quality of each travelling carriage near required communication quality.
Other advantage and modification are conspicuous to those of skill in the art.Therefore, from wideer aspect, specific detail and typical embodiment that the present invention is not limited thereto locates to show and describe.Therefore, under the spirit or scope situation that does not break away from this integral body inventive concept that defines by claims, can make various distortion.
Claims (7)
1. mobile communication system, it carries out multiple access communication by a radio station and a plurality of travelling carriage, wherein
Each travelling carriage comprises the measuring appliance that is used to measure from the communication quality of the signal of this radio station's emission; This radio station comprises:
A communication quality grabber is used to obtain the communication quality from a plurality of travelling carriages;
A transmission method converter is used for changing at least one transmission method of the error rate, repetition bits quantity, weaving length, multi-code quantity and transmission signals number of iterations according to acquired communication quality; And
A reflector is used to utilize altered transmission method to transmit signals to a plurality of travelling carriages.
2. a radio station is used for carrying out multiple access communication with a plurality of travelling carriages, and this radio station comprises:
A communication quality grabber is used to obtain from the communication quality of a plurality of travelling carriages by the signal of this multiple access communication emission;
A transmission method converter is used for changing at least one transmission method of the error rate, repetition bits quantity, weaving length, multi-code quantity and transmission signals number of iterations according to acquired communication quality; And
A reflector is used to utilize altered transmission method to transmit signals to a plurality of travelling carriages.
3. according to the radio station of claim 2, wherein this communication quality grabber is selected minimum communication quality among acquired communication quality; And
This transmission method converter changes transmission method according to the communication quality of the minimum of selecting.
4. according to the radio station of claim 2, wherein the communication quality grabber calculates the mean value of the communication quality of obtaining from a plurality of travelling carriages; And
This transmission method converter changes transmission method according to mean value that calculates and the difference between the predetermined reference value.
5. according to the radio station of claim 2, further comprise a radio resource manager, be used for the situation of managing radio resources; And wherein
The transmission method converter changes transmission method according to the communication quality that obtains and the situation of radio resource.
6. according to the radio station of claim 2, wherein communication quality comprises at least one in received power, signal error rate, interference signal level and the signal to noise ratio.
7. a method of mobile communication is carried out multiple access communication by a radio station and a plurality of travelling carriage, and this method comprises the steps:
In each travelling carriage, measure from the communication quality of the signal of this radio station's emission;
In this radio station, obtain communication quality from a plurality of travelling carriages;
In this radio station, change in the error rate, repetition bits quantity, weaving length, multi-code quantity and the transmission signals number of iterations transmission method of at least one according to acquired communication quality; And
In this radio station, utilize altered transmission method to transmit signals to this a plurality of travelling carriages.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002292792 | 2002-10-04 | ||
| JP2002292792 | 2002-10-04 | ||
| JP2002321870 | 2002-11-05 |
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| CN1497990A true CN1497990A (en) | 2004-05-19 |
| CN1254130C CN1254130C (en) | 2006-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310100096 Expired - Fee Related CN1254130C (en) | 2002-10-04 | 2003-10-08 | Mobile communication system, mobile communication method and radio station used for them |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101578822B (en) * | 2007-01-25 | 2012-01-11 | 株式会社日立制作所 | Radio communication system and method for distributing multicast data for radio communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101578822B (en) * | 2007-01-25 | 2012-01-11 | 株式会社日立制作所 | Radio communication system and method for distributing multicast data for radio communication system |
| US8175023B2 (en) | 2007-01-25 | 2012-05-08 | Hitachi, Ltd. | Radiocommunication system and multicast data distribution method in the radiocommunication system |
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| Publication number | Publication date |
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| CN1254130C (en) | 2006-04-26 |
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