CN101536429A

CN101536429A - Communication apparatus, communication method, communication control apparatus, wireless communication apparatus, communication control method, and wireless communication method

Info

Publication number: CN101536429A
Application number: CNA2007800408076A
Authority: CN
Inventors: 守田空悟
Original assignee: Kyocera Corp
Current assignee: Kyocera Corp
Priority date: 2006-10-30
Filing date: 2007-10-29
Publication date: 2009-09-16
Anticipated expiration: 2027-10-29
Also published as: JP2008113204A; CN101536429B; JP5324038B2

Abstract

In order to detect a change in the propagation environment of a wireless communication path rapidly and accurately and to minimize the number of packets to be discarded without being reproduced due to a delay in arrival time, a communication apparatus 1 for performing communication through a wireless communication path comprises a band status monitoring unit (15) for monitoring the band status of a wireless communication path based on the comparison between an allowable range indicating an allowable receiving timing range of the packets to be received through a wireless communication path and a receiving timing of the packets received through a wireless communication path, or based on the packets received through a wireless communication path within a monitoring period corresponding to a transmission interval of the packets to be sent to a wireless communication path, and transmission band control message sending units (16, 11) for sending the corresponding party a transmission band control message for controlling a transmission band of packets based on a monitoring result by the band status monitoring unit 15.

Description

Communicator, communication means, communication control unit, radio communication device, communication control method and wireless communications method

The cross reference of related application

The application requires priority and the rights and interests of Japanese patent application No.2006-294664, the 2006-294671,2006-294826 and the 2006-294830 that submit on October 30th, 2006, and their full content is herein incorporated with for referencial use.

Technical field

The present invention relates to a kind of communicator and communication means, be used for communicating by wireless communications path, and a kind of communication control unit of novelty, radio communication device, communication control method and wireless communications method, can use many different wireless communications paths, and, communicate by the frequency band deficiency that compensates a wireless communications path with another wireless communications path at the required frequency band of real-time application in using.

Background technology

In recent years, along with the price of the popular and high-end PC of cheap and flat rate ADSL service descends, can other have realized internet access at each household easily.In addition, the handled data of internet access become webpage based on image, Voice ﹠ Video from the text based webpage.Therefore, the demand in broadband is increased day by day, and broadband A SL and broadband optical communication are just becoming more and more for popular in order to realize gratifying web visit people.

In addition, in recent years,, scattered a large amount of free voice communication software programs along with the development of stable internet access environment at a high speed.Therefore, can between dwelling house, use the voice communication of flat rate at present.In addition, it is believed that home network be extensive use of and with the HDD register as the HDD server, with the chance that increases by using the pc access home network that is connected with the network that is arranged in another place to watch the video that is stored in the HDD server.This can make us watch Chinese TV programme abroad by the server of home network server.

In every household and the Internet by such as in ADSL and the environment that circuits such as optical communication are connected, can by when connecting, consult with select and PC between the corresponding encoding rate of communication band and the disposal ability of PC, realize that gratifying voice communication and video watch.

In addition, recently, based on the mobile communication terminal of voice communication also towards the wideer frequency band and the trend development of more performance.As for example Japanese patent application examine open No.2004-328593 disclosed, application (as from the mobile communication terminal access internet) based on data communication is just becoming a kind of main flow, therefore, mobile communication terminal is also towards the trend development of the voice and video communication of using data communication network.

Yet, because mobile communication terminal is wireless connections, therefore with comparing its propagation/transmission path instability such as wired connections such as being used for indoor ADSL and optical communication.Therefore, select the modulation scheme of radio communication at the mobile communication terminal place according to the variation of propagating transmission path.When communication environments is better relatively, select to allow the modulation scheme of high-speed communication.When communication environments is abominable, selects to have the modulation scheme (causing low-speed communication) of improved fault-tolerant ability, thereby can realize continuous communiction.

Yet even mobile communication terminal transfixion in communication process, communication environments also can fluctuate according to the change of surrounding environment.In addition, communication environments also fluctuates according to the characteristic of the employed frequency of communication.In addition, when mobile communication terminal moved, communication environments can change rapidly from stable state.

Therefore, with regard to radio communication, when identical with the situation of wire communication, thereby by begin communication after the encoding rate that is provided with voice and video of holding consultation when connecting, the voice and video data may be owing to the deterioration of communication environments is lost so.

In addition, with regard to radio communication, in order to realize high-speed communication, on the terminal of cordless communication network or base station, assembled buffer, with cumulative data (grouping).More specifically, when the user's who is wirelessly connected to a base station (terminal) quantity increases, must improve the efficiency of transmission of each communication, think that each user provides gratifying communication service.Therefore, need in short-term, closely place mass data, and use modulation system that it is sent with higher transmission efficient with extremely intensive state.Therefore, assembled buffer with capacity of realizing that described high density is required.

Therefore, at the place, base station, will be accumulated in the buffer with the corresponding data of encoding rate (grouping) order of the voice and video that receives from wired side (with regard to terminal, application side).Then, call over the data (grouping) of being accumulated, and with the corresponding communication speed of wireless propagation environment it is sent.

Therefore, when the wireless propagation environment variation, compare with the speed that flows into data, the speed of the data (grouping) that flow out from buffer is slower, and this has increased the data volume of accumulating in the buffer.Then, send the data of being accumulated with the time delay of following communication environments to recover.

Yet cumulative data in buffer (data delay) is very crucial for the voice and video communication that requires real-time characteristic.Therefore, even data are sent from buffer, reproduce regularly because these data have exceeded, so the great majority in these data also will be dropped in the moment of following communication environments to recover.In addition, when from the speed of buffer sense data when very low, the data deficiencies that reproduce, and finally lose at receiver side, be that voice and video may be very difficult therefore with data reproduction.

As a kind of method of avoiding the problems referred to above, for example at application layer, knownly can provide wobble buffer, with accumulation and corresponding data of time quantum based on the shake of data in the time of advent.When receiving data,, just data are called over then according to the reproduction speed of using in case in wobble buffer, accumulated data.Thus, wobble buffer can the shake of absorption data in the time of advent.

Yet, with regard to regard to the communication path of cordless communication network, because the shake in its time of advent greater than the shake in the time of advent of cable network, therefore needs great wobble buffer to absorb shake.If so big wobble buffer (can accumulate the buffer that is equivalent to than the data volume of long duration) is adopted in telephone talk, the effect that speech data reproduces just looks like that the arrival of speech data has time delay, and this will make the user not feel well.

In addition, as a kind of voice and video method for communicating that is used to realize paying close attention to real-time characteristic, can be set to variable coding rate according to wireless propagation environment (change of wireless or wired communication path is depended in the change of communication environments) encoding rate.In order to keep real-time characteristic, when communication environments worsens, encoding rate can be switched to the low rate coding scheme, when communication environments recovers, it can be switched to the encoding scheme that allows improved voice and picture quality.

In this case, need to detect the communication environments of communication path.For example, as a kind of feasible method, can monitor the cumulative data amount in the wobble buffer.When cumulant is equal to or less than predetermined threshold, can detect the generation that data are detained in the deterioration of communication environments and the communication path.

Yet, in this case, rapid deterioration (allowing frequency band to narrow down) for communication environments, if detecting the moment of deterioration delays time to some extent, on the communication path, that be detained (accumulation) data (grouping) in buffer so quantity will increase, and concrete recruitment depends on described delay time.Therefore and since data be detained is solved before, data are delayed always, even thereby in response to the deterioration that detects communication environments, with the encoding rate reduction, real-time characteristic also can be damaged.

The another kind of method that narrows down as the permission frequency band that detects wireless communications path, for example, can monitor window Ts (scheduled time slot; The quantity of the grouping that receives 500ms for example).Then, when the quantity of the grouping that receives when estimating number of packet, detect and allow frequency band to narrow down.

Yet, in this case, be detained timing (monitoring period) fluctuation of time-delay with window Ts.For example, as shown in figure 19, suppose when the transmission packets of using (being VoIP) is spaced apart 20ms,, allow frequency band to be narrowed 50% at moment t1.In Figure 19, transverse axis express time (t), the longitudinal axis are represented the sequence number (SN) of dividing into groups.In addition, Dp represents that the ideal that is timed to the path from transmission packets receives the potential delay time regularly (being 80ms herein), and Tb represents to allow the time (being 200ms herein) apart from transmission packets reproduction regularly, and Ds represents to be detained time of delay.

In Figure 19, when the reception number of packet of monitor window Ts before moment t1, find that receiving number of packet reduces.Yet when the reception number of packet of window Ts during moment t2 monitoring (t2-t1), the quantity that receives grouping is 12, and this quantity is half (500ms/20ms=25 the grouping) that receives the grouping estimate amount.Therefore, need reduce encoding rate.Yet, in this case, owing to receive the grouping (SN4) that sends at moment t2, therefore with respect to producing 580ms (=t4-t3) delay Ds time of delay the desirable time of reception at moment t4.

Therefore, suppose the grouping that abandons (not reproducing) and after the reproduction of transmit timing 200ms allows time T b, receive (reproducing the grouping that allows after the line).In this case, in Figure 19,23 indicated groupings of black circles are abandoned in 25 groupings that sent in window Ts, and do not produce contribution to reproducing.

By this way, under the situation of the quantity that receives grouping less than the estimation number of packet, when monitoring, when the permission frequency band that detects the path has narrowed down, be detained timing (monitoring period) fluctuation of time of delay with window Ts based on the quantity of the grouping that receives in to window Ts.Therefore, according to the concrete timing of window Ts, what be worth worry is that the great majority grouping that sends in window Ts may all can be abandoned, and reproduction is not made contributions.

In addition, abandon the method for number of packet as a kind of minimizing, in Figure 19, can be by window Ts being provided with to such an extent that short the shortening is detained Ds time of delay.Yet the quantity of reception grouping and the transmission packets of communication path are partitioned into inverse ratio among the window Ts.Therefore, the quantity that receives grouping reduces with transmission intercal is elongated.

Therefore, shorter if the duration of Ts is set to, when transmission intercal was longer, it is especially difficult that the setting of threshold value just becomes so.Therefore, worth worry is accurately to detect the frequency band that has narrowed down.

In addition, when by when radio communication device (as mobile communication terminal) access internet is carried out data communication, internet usage agreement (IP) group." IPMobilitySupport (RFC2002) " as for example C.Perkins, [online], in October, 1996, IETF, [retrieval on March 15th, 2006], Internet＜URL:http: //www.ietf.org/rfc/rfc2002.txt. disclosed like that, for the cordless communication network that uses this IP group (below be sometimes referred to as " Wireless IP network "), in order to improve the mobility of radio communication device, define so-called mobile IP.

In mobile IP, use according to what the position dynamic of radio communication device was distributed and deliver IP address (Care-of Address).

By the way be to have engendered that recently radio communication device can use the environment of multiple Wireless IP network (as mobile telephone network and wireless lan network).

If a kind of like this environment is provided, can use a plurality of Wireless IP networks simultaneously so, thus can be when the frequency band deficiency of the employed Wireless IP network of ongoing communication, with the frequency band of another Wireless IP network undercompensation.

Yet, suppose that a Wireless IP network is a main path and another Wireless IP network is from the path, and use from the deficiency of path compensation main path, if from the permission frequency band in path frequency band deficiency for the needs compensation, so because the frequency band deficiency, to will be issued to from the grouping in path and be accumulated in the buffer that is present on the path temporarily for carrying out band compensation, order be sent then.Therefore, at receiver side, occur postponing in the grouping that receives by main path with between by the grouping that receives from the path.With regard to the VoIP grouping, it is leading that this delay shows as SN (sequence number).

In such as application in real time such as VoIP, the assembling wobble buffer is to absorb divide into groups in the network leading.Yet, the variable length delay when between the path, and when exceeding the buffer capacity of wobble buffer, even receive the grouping that postpones and exceed capacity, also this grouping is abandoned.Therefore, exceed the grouping that allows frequency band if continue to send, the amount of packets that be accumulated in the buffer that is present on the path increases (until the power-carrying of buffer), and causes that according to cumulant delay is poor.And then final, be discarded as all groupings that compensation sends at receiver side.

Particularly, in wireless communications path, because the permission frequency band depends on the change such as communication environments such as declines, even the therefore permission frequency band abundance from the path in initial period that communication starts, because the deterioration of communication environments, frequency band also can narrow down, and this will cause the generation of above-mentioned phenomenon.For fear of in this, need accurately to detect the fluctuation that allows frequency band (in particular for the narrow-band from the path of compensation), and determine whether transmission band this moment (bandwidth assignment rate) is suitable, to avoid exceeding the compensation that allows frequency band.

In addition, owing to allow the fluctuation of frequency band also to occur in the main path side in the same way, therefore main path also needs accurately to measure the fluctuation (especially true when frequency band narrows down) that allows frequency band, and whether the transmission band (bandwidth assignment rate) of judging current time is suitable, surpasses the permission frequency band to avoid transmitted in packets.

For example, definite method as a kind of such transmission band, as shown in figure 19, can be by for every communication path window Ts being set with scheduled time slot (as 500ms), the quantity of the grouping that monitoring receives, and the quantity of the grouping that receives less than estimate according to the bandwidth assignment rate of communication path number of packet (threshold value) time detect communication path the permission bandwidth narrow down, determine transmission band whether become improper (deterioration).

Yet, as mentioned above, in this case, in every figure path, be detained timing (promptly the monitor period) fluctuation of time of delay with window Ts.Therefore, what be worth worry is that according to the concrete timing of window Ts, the great majority that send in window Ts grouping may all can be abandoned, and reproduction is not made contributions.

In addition, as mentioned above, when by being provided with window Ts shorter, shorten and be detained Ds time of delay, when abandoning the quantity of grouping with minimizing, because the quantity of the grouping that receives in window Ts is proportional to the bandwidth assignment rate of communication path, therefore the quantity of the grouping that receives reduces with the reduction of bandwidth assignment rate.Therefore, worth worry is especially under the lower situation of bandwidth assignment rate, to be difficult to be provided with threshold value, and can't accurately to detect the frequency band that narrows down.

Summary of the invention

Technical problem

In view of the above problems, first purpose of the present invention is: a kind of communicator and communication means are provided, can detect the variation of the communication environments of wireless communications path quickly and accurately, and minimize the quantity of the grouping that can't reproduce that need abandon owing to the delay of the time of advent.

In addition, second purpose of the present invention is: a kind of communication control unit, radio communication device, communication control method and wireless communications method are provided, can use many different wireless communications paths, when communicating, exactly, being close in real time, the detected transmission frequency band narrows down, compensate the frequency band deficiency of another wireless communications path simultaneously with a wireless communications path, and reduce the quantity of the grouping that can't reproduce that need abandon effectively owing to the delay of the time of advent.

The technical scheme of dealing with problems

According in order to realize a first aspect of the present invention of above-mentioned first purpose, a kind of communicator of communicating by wireless communications path of being used for comprises:

Frequency band condition monitoring unit, be used for the comparison that the reception of the grouping that receives based on allowed band with by described wireless communications path is fixed time, monitor the frequency band state of described wireless communications path, the permission reception timing range of the grouping that the indication of described allowed band will receive by described wireless communications path; And

Transmission band control messages transmitting element is used for the monitored results based on frequency band condition monitoring unit, sends the transmission band control messages that is used to control the transmission packets frequency band to Correspondent Node.

According to a second aspect of the invention, in the communicator according to first aspect, frequency band condition monitoring unit regularly is provided with described allowed band based on the reception of the grouping that receives in scheduled time slot.

According to a third aspect of the invention we, the communicator according to first aspect also comprises:

Transmission band control messages receiving element is used for receiving the transmission band control messages that is used to control the transmission packets frequency band from described Correspondent Node; And

The transmission band control unit, be used for the described transmission band control messages that receives based on described transmission band control messages receiving element or the described monitored results of described frequency band condition monitoring unit, control will be sent to the transmission packets frequency band of described Correspondent Node.

According to a forth aspect of the invention, in the communicator according to the third aspect, the transmission band control unit is controlled the encoding rate of the data that will be sent to described Correspondent Node or the transmission of file.

In addition, according in order to realize the 5th aspect of above-mentioned first purpose, a kind of invention that is used for the communication means that communicates by wireless communications path comprises:

The reception of the grouping that receives based on allowed band with by described wireless communications path is regularly monitored the frequency band state of described wireless communications path, the permission reception timing range of the grouping that described allowed band indication will receive by described wireless communications path;

Send the transmission band control messages that is used to control the transmission packets frequency band to Correspondent Node based on described monitored results; And

When communicating, control described transmission band based on described transmission band control messages.

In addition, according in order to realize a sixth aspect of the present invention of above-mentioned first purpose, a kind of being used for sends the grouping of a plurality of different pieces of informations and receives the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprising:

For each data in described a plurality of different pieces of informations, the reception of the grouping that receives based on allowed band with by described wireless communications path regularly, monitor the frequency band state of described wireless communications path, the permission reception timing range of the grouping that the indication of described allowed band will receive by described wireless communications path; And

When showing that based on the described monitored results of transmission band to(for) any one data has narrowed down, send the transmission band control messages of the transmission rate that is used to reduce all data to described Correspondent Node.

In addition, according in order to realize a seventh aspect of the present invention of above-mentioned first purpose, a kind of being used for sends the grouping of a plurality of different pieces of informations and receives the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprising:

Monitor the wireless status of described wireless communications path;

For each data in described a plurality of different pieces of informations, the reception of the grouping that receives based on allowed band with by described wireless communications path regularly, monitor the frequency band state of described wireless communications path, the permission reception timing range of the grouping that the indication of described allowed band will receive by described wireless communications path;

When based on the monitored results of described wireless status and the monitored results of described frequency band state, show that described wireless status is good, and as described frequency band state, when the transmission band of any one data has narrowed down, send to described Correspondent Node and to be used to the transmission band control messages that reduces the transmission rate of described data or stop to send data; And

When showing that described wireless status is abominable, and as described frequency band state, when the transmission band of any one data has narrowed down, send to described Correspondent Node and to be used to the transmission band control messages that reduces the transmission rate of total data or stop to send data.

In addition, according in order to realize a eighth aspect of the present invention of above-mentioned first purpose, a kind of communicator of communicating by wireless communications path of being used for comprises:

Frequency band condition monitoring unit, be used for based on monitoring the grouping that receives by described wireless communications path in the period, monitor the frequency band state of described wireless communications path, the described monitoring period is corresponding at interval with the transmission packets that will be sent to described wireless communications path; And

Transmission band control messages transmitting element is used for the monitored results based on described frequency band condition monitoring unit, sends the transmission band control messages that is used to control the transmission packets frequency band to Correspondent Node.

According to a ninth aspect of the invention, in the communicator according to eight aspect, the transmission packets period of the predetermined quantity of the order that frequency band condition monitoring unit will send with described transmission intercal is set to the described monitoring period.

According to the tenth aspect of the invention, in communicator according to eight aspect, described frequency band condition monitoring unit calculates the reception amount of deflection regularly of the grouping that will receive by described wireless communications path in the described monitoring period, and based on the described amount of deflection that calculates and and the corresponding threshold value of described transmission intercal between comparison, monitor described frequency band state.

According to an eleventh aspect of the invention, the communicator according to eight aspect also comprises:

According to a twelfth aspect of the invention, in the communicator according to the tenth one side, described transmission band control unit is controlled the encoding rate of the data that will be sent to described Correspondent Node or the transmission of file.

In addition, according in order to realize the 13 aspect of above-mentioned first purpose, a kind of the present invention who is used for the communication means that communicates by wireless communications path comprises:

Based on the grouping that in the monitoring period, receives by described wireless communications path, monitor the frequency band state of described wireless communications path, the described monitoring period is corresponding at interval with the transmission packets that will be sent to described wireless communications path;

Based on described monitored results, send the transmission band control messages that is used to control the transmission packets frequency band to Correspondent Node; And

In addition, according in order to realize a fourteenth aspect of the present invention of above-mentioned first purpose, a kind of being used for sends the grouping of a plurality of different pieces of informations and receives the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprising:

For each data in described a plurality of different pieces of informations, based on the grouping that in the monitoring period, receives by described wireless communications path, monitor the frequency band state of described wireless communications path, the described monitoring period is corresponding at interval with the transmission packets that will be sent to described wireless communications path; And

In addition, according in order to realize a fifteenth aspect of the present invention of above-mentioned first purpose, a kind of being used for sends the grouping of a plurality of different pieces of informations and receives the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprising:

Monitor the wireless status of described wireless communications path;

For each data in described a plurality of different pieces of informations, based on the grouping that in the monitoring period, receives by described wireless communications path, monitor the frequency band state of described wireless communications path, the described monitoring period is corresponding at interval with the transmission packets that will be sent to described wireless communications path;

In addition, according in order to realize a sixteenth aspect of the present invention of above-mentioned second purpose, a kind of communication control unit, can use many different wireless communications paths of radio communication device, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control unit comprises:

First upwards allowed band the unit is set, be used to be provided with first allowed band upwards, the described first permission reception timing range of the allowed band indication grouping that will receive by a described wireless communications path upwards;

The first frequency band status determining unit upwards, be used for based on by described first upwards allowed band the described first upwards reception of allowed band and the grouping that receives by the described wireless communications path comparison of fixing time of unit setting is set, determine the upwards frequency band state of a described wireless communications path;

First transmission control unit upwards, be used for based on described first definite result of frequency band status determining unit upwards, send first control information transmission upwards to described radio communication device, be used to control and be sent to the transmission packets frequency band of a described wireless communications path by described radio communication device;

Second upwards allowed band the unit is set, be used to be provided with second allowed band upwards, the described second permission reception timing range of the allowed band indication grouping that will receive by described another wireless communications path upwards;

The second frequency band status determining unit upwards, be used for based on by described second upwards allowed band the described second upwards reception of allowed band and the grouping that receives by described another wireless communications path comparison of fixing time of unit setting is set, determine the upwards frequency band state of described another wireless communications path; And

Second transmission control unit upwards, be used for based on described second definite result of frequency band status determining unit upwards, send second control information transmission upwards to described radio communication device, be used to control and be sent to the transmission packets frequency band of described another wireless communications path by described radio communication device.

According to a seventeenth aspect of the invention, in according to the communication control unit aspect the 16,

Described first upwards allowed band the unit is set regularly based on the reception of the grouping that in scheduled time slot, receives by a described wireless communications path, described first upwards allowed band be set to receive allowed band regularly apart from the ideal of the grouping of a described wireless communications path; And

Described second upwards allowed band the unit is set regularly based on the reception of the grouping that in scheduled time slot, receives by described another wireless communications path, described second upwards allowed band be set to receive allowed band regularly apart from the ideal of the grouping of described another wireless communications path.

According to an eighteenth aspect of the invention, in according to the communication control unit aspect the 16,

When described first when upwards the frequency band status determining unit determines that the frequency band of a described wireless communications path has narrowed down, described first upwards transmission control unit send control information as described first control information transmission upwards to described radio communication device, described control information is used to reduce and will be sent to the bandwidth assignment rate of the grouping of a described wireless communications path by described radio communication device; And

When described second when upwards the frequency band status determining unit determines that the frequency band of described another wireless communications path has narrowed down, described second upwards transmission control unit send control information as described second control information transmission upwards to described radio communication device, described control information is used to reduce and will be sent to the bandwidth assignment rate of the grouping of described another wireless communications path by described radio communication device.

In addition, according in order to realize a nineteenth aspect of the present invention of above-mentioned second purpose, a kind of radio communication device, can use and many of communication control unit different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described radio communication device comprises:

The first downward allowed band is provided with the unit, is used to be provided with the first downward allowed band, the permission reception timing range of the grouping that the indication of the described first downward allowed band will receive by a described wireless communications path;

The first downward frequency band status determining unit, be used for the comparison that the reception of the grouping that receives based on the described first downward allowed band that the unit setting is set by the described first downward allowed band with by described wireless communications path is fixed time, determine the downward frequency band state of a described wireless communications path;

The first downward transmission control unit, be used for definite result based on the described first downward frequency band status determining unit, send the first downward control information transmission to described communication control unit, be used to control and be sent to the transmission packets frequency band of a described wireless communications path by described communication control unit;

The second downward allowed band is provided with the unit, is used to be provided with the second downward allowed band, the permission reception timing range of the grouping that the indication of the described second downward allowed band will receive by described another wireless communications path;

The second downward frequency band status determining unit, be used for the comparison that the reception of the grouping that receives based on the described second downward allowed band that the unit setting is set by the described second downward allowed band with by described another wireless communications path is fixed time, determine the downward frequency band state of described another wireless communications path; And

The second downward transmission control unit, be used for definite result based on the described second downward frequency band status determining unit, send the second downward control information transmission to described communication control unit, be used to control and be sent to the transmission packets frequency band of described another wireless communications path by described communication control unit.

According to a twentieth aspect of the invention, in according to the radio communication device aspect the 19,

The described first downward allowed band is provided with the reception timing of unit based on the grouping that receives by a described wireless communications path in scheduled time slot, the described first downward allowed band is set to receive allowed band regularly apart from the ideal of the grouping of a described wireless communications path; And

The described second downward allowed band is provided with the reception timing of unit based on the grouping that receives by described another wireless communications path in scheduled time slot, the described second downward allowed band is set to receive allowed band regularly apart from the ideal of the grouping of described another wireless communications path.

According to a twenty-first aspect of the invention, in according to the radio communication device aspect the 19,

When the described first downward frequency band status determining unit determines that the frequency band of a described wireless communications path has narrowed down, the described first downward transmission control unit sends control information as the described first downward control information transmission to described communication control unit, and described control information is used to reduce and will be sent to the bandwidth assignment rate of the grouping of a described wireless communications path by described communication control unit; And

When the described second downward frequency band status determining unit determines that the frequency band of described another wireless communications path has narrowed down, the described second downward transmission control unit sends control information as the described second downward control information transmission to described communication control unit, and described control information is used to reduce and will be sent to the bandwidth assignment rate of the grouping of described another wireless communications path by described communication control unit.

In addition, according in order to realize the 22 aspect of the present invention of above-mentioned second purpose, a kind of communication control method, can use many different wireless communications paths of radio communication device, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control method may further comprise the steps:

First allowed band upwards is set, the described first permission reception timing range of the allowed band indication grouping that will receive by a described wireless communications path upwards;

Based on the set described first upwards reception of allowed band and the grouping that receives by the described wireless communications path comparison of fixing time, determine the upwards frequency band state of a described wireless communications path;

Based on described definite result, send first control information transmission upwards to described radio communication device, be used to control and will be sent to the transmission packets frequency band of a described wireless communications path by described radio communication device;

Second allowed band upwards is set, the described second permission reception timing range of the allowed band indication grouping that will receive by described another wireless communications path upwards;

Based on the set described second upwards reception of allowed band and the grouping that receives by described another wireless communications path comparison of fixing time, determine the upwards frequency band state of described another wireless communications path; And

Based on described definite result, send second control information transmission upwards to described radio communication device, be used to control and will be sent to the transmission packets frequency band of described another wireless communications path by described radio communication device.

In addition, according in order to realize the 23 aspect of the present invention of above-mentioned second purpose, a kind of wireless communications method, can use many different wireless communications paths of communication control unit, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described wireless communications method may further comprise the steps:

The first downward allowed band is set, the permission reception timing range of the grouping that the indication of the described first downward allowed band will receive by a described wireless communications path;

The downward frequency band state of a described wireless communications path is determined in the comparison that the reception of the grouping that receives based on the described first set downward allowed band with by described wireless communications path is fixed time;

Based on described definite result, send the first downward control information transmission to described communication control unit, be used to control and will be sent to the transmission packets frequency band of a described wireless communications path by described communication control unit;

The second downward allowed band is set, the permission reception timing range of the grouping that the indication of the described second downward allowed band will receive by described another wireless communications path;

The downward frequency band state of described another wireless communications path is determined in the comparison that the reception of the grouping that receives based on the described second set downward allowed band with by described another wireless communications path is fixed time; And

Based on described definite result, send the second downward control information transmission to described communication control unit, be used to control and will be sent to the transmission packets frequency band of described another wireless communications path by described communication control unit.

In addition, according in order to realize the 24 aspect of the present invention of above-mentioned second purpose, a kind of communication control unit, can use and many of radio communication device different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control unit comprises:

The first bandwidth assignment rate determining unit upwards is used for determining to be sent to the bandwidth assignment rate of the grouping of a described wireless communications path by described radio communication device;

The first frequency band status determining unit upwards, be used for based on will upwards monitoring the grouping that receives by a described wireless communications path in the period first, determine the upwards frequency band state of a described wireless communications path, described first upwards monitors the period, and upwards the determined bandwidth assignment rate of bandwidth assignment rate determining unit is corresponding with described first;

The second bandwidth assignment rate determining unit upwards is used for determining to be sent to the bandwidth assignment rate of the grouping of described another wireless communications path by described radio communication device;

The second frequency band status determining unit upwards, be used for based on will upwards monitoring the grouping that receives by described another wireless communications path in the period second, determine the upwards frequency band state of described another wireless communications path, described second upwards monitors the period, and upwards the determined bandwidth assignment rate of bandwidth assignment rate determining unit is corresponding with described second; And

According to the twenty-fifth aspect of the invention, in according to the communication control unit aspect the 24,

Described first upwards monitor the period with will with by described first upwards the described bandwidth assignment rate determined of bandwidth assignment rate determining unit be sent to transmission packets period of predetermined quantity of order of a described wireless communications path by described radio communication device corresponding; And

Described second upwards monitor the period with will with by described second upwards the described bandwidth assignment rate determined of bandwidth assignment rate determining unit be sent to transmission packets period of predetermined quantity of order of described another wireless communications path by described radio communication device corresponding.

According to the twenty-sixth aspect, in according to the communication control unit aspect the 24,

Described first upwards the frequency band status determining unit calculate will be in described first amount of deflection of upwards monitoring the reception timing of the grouping that receives by a described wireless communications path in the period, and based on the comparison between described amount of deflection that calculates and threshold value, determine the upwards frequency band state of a described wireless communications path, described threshold value is corresponding to by the described first bandwidth assignment rate determined of bandwidth assignment rate determining unit upwards; And

Described second upwards the frequency band status determining unit calculate will be in described second amount of deflection of upwards monitoring the reception timing of the grouping that receives by described another wireless communications path in the period, and based on the comparison between described amount of deflection that calculates and threshold value, determine the upwards frequency band state of described another wireless communications path, described threshold value is corresponding to by the described second described bandwidth assignment rate determined of bandwidth assignment rate determining unit upwards.

In addition, according in order to realize the 27 aspect of above-mentioned second purpose, a kind of radio communication device, can use and many of communication control unit different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described radio communication device comprises:

The first downward bandwidth assignment rate determining unit is used for determining to be sent to the bandwidth assignment rate of the grouping of a described wireless communications path by described communication control unit;

The first downward frequency band status determining unit, be used for based on monitoring the grouping that receives by a described wireless communications path in the period downwards first, determine the downward frequency band state of a described wireless communications path, the described first downward monitoring period is corresponding with the determined bandwidth assignment rate of the described first downward bandwidth assignment rate determining unit;

The second downward bandwidth assignment rate determining unit is used for determining to be sent to the bandwidth assignment rate of the grouping of described another wireless communications path by described communication control unit;

The second downward frequency band status determining unit, be used for based on monitoring the grouping that receives by described another wireless communications path in the period downwards second, determine the downward frequency band state of described another wireless communications path, the described second downward monitoring period is corresponding with the determined bandwidth assignment rate of the described second downward bandwidth assignment rate determining unit; And

According to a twenty-eighth aspect of the invention, in according to the radio communication device aspect the 27,

The described first downward monitoring period is corresponding with the transmission packets period of the predetermined quantity of the order that will be sent to a described wireless communications path with the described bandwidth assignment rate of being determined by the described first downward bandwidth assignment rate determining unit by described communication control unit; And

The described second downward monitoring period is corresponding with the transmission packets period of the predetermined quantity of the order that will be sent to described another wireless communications path with the described bandwidth assignment rate of being determined by the described second downward bandwidth assignment rate determining unit by described communication control unit.

According to the twenty-ninth aspect, in according to the radio communication device aspect the 27,

The described first downward frequency band status determining unit is calculated the reception amount of deflection regularly of the grouping that will receive by a described wireless communications path in the described first downward monitoring period, and based on the comparison between described amount of deflection that calculates and threshold value, determine the downward frequency band state of a described wireless communications path, described threshold value is corresponding to the bandwidth assignment rate of being determined by the described first downward bandwidth assignment rate determining unit; And

The described second downward frequency band status determining unit is calculated the reception amount of deflection regularly of the grouping that will receive by described another wireless communications path in the described second downward monitoring period, and based on the comparison between described amount of deflection that calculates and threshold value, determine the downward frequency band state of described another wireless communications path, described threshold value is corresponding to the described bandwidth assignment rate of being determined by the described second downward bandwidth assignment rate determining unit.

In addition, according in order to realize the 30 aspect of the present invention of above-mentioned second purpose, a kind of communication control method, can use many different wireless communications paths of radio communication device, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control method may further comprise the steps:

Determine to be sent to the bandwidth assignment rate of the grouping of a described wireless communications path by described radio communication device;

Based on will upwards monitoring in the period grouping that receives by a described wireless communications path first, determine the upwards frequency band state of a described wireless communications path, described first upwards to monitor the period corresponding with determined described bandwidth assignment rate;

Determine to be sent to the bandwidth assignment rate of the grouping of described another wireless communications path by described radio communication device;

Based on will upwards monitoring in the period grouping that receives by described another wireless communications path second, determine the upwards frequency band state of described another wireless communications path, described second upwards to monitor the period corresponding with determined described bandwidth assignment rate; And

In addition, according to for realize above-mentioned second purpose the of the present invention the 30 on the one hand, a kind of wireless communications method, can use many different wireless communications paths of communication control unit, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described wireless communications method may further comprise the steps:

Determine to be sent to the bandwidth assignment rate of the grouping of a described wireless communications path by described communication control unit;

Based on monitoring the grouping that receives by a described wireless communications path in the period downwards first, determine the downward frequency band state of a described wireless communications path, the described first downward monitoring period is corresponding with determined bandwidth assignment rate;

Determine to be sent to the bandwidth assignment rate of the grouping of described another wireless communications path by described communication control unit;

Based on monitoring the grouping that receives by described another wireless communications path in the period downwards second, determine the downward frequency band state of described another wireless communications path, the described second downward monitoring period is corresponding with determined bandwidth assignment rate; And

Beneficial effect of the present invention

According to first to the 7th aspect of the present invention, the frequency band state is regularly monitored in reception based on allowed band and reception grouping, and will be sent to Correspondent Node based on the transmission band control messages of monitored results, the permission of the grouping that the indication of described allowed band will receive by wireless communications path receives timing range.Therefore, the change of communication environments that can be by promptly detecting wireless communications path is in suitably control and the corresponding transmission band of frequency band state in real time of transmitter side.Therefore, can minimize because the quantity of the grouping of reproducing that will be dropped that the delay of the time of advent causes.

According to the 8th to the 15 aspect of the present invention, monitor the frequency band state based on the grouping that receives in the monitoring period, and will be sent to Correspondent Node based on the transmission band control messages of monitored results, the described monitoring period is corresponding at interval with the transmission packets that will be sent to wireless communications path.Therefore, can be by accurately promptly detecting the change of the communication environments of wireless communications path, in suitably control and the corresponding transmission band of frequency band state in real time of transmitter side.Therefore, can minimize because the quantity of the grouping of reproducing that will be dropped that the delay of the time of advent causes.

According to the 16 to the 23 aspect of the present invention, when by using many different wireless communications paths simultaneously, when communicating, can detect in real time almost when transmission band narrows down in each wireless communications path with the frequency band deficiency of a wireless communications path of another wireless communications path compensation.Therefore, a kind of communication control unit, radio communication device, communication control method and wireless communications method can be provided, the quantity of the grouping that can't reproduce that need abandon can be minimized owing to the delay of the time of advent.

According to the of the present invention the 24 to the 30 on the one hand, when by using many different wireless communications paths simultaneously, when communicating, can detect accurately rapidly almost when transmission band narrows down in each wireless communications path with the frequency band deficiency of a wireless communications path of another wireless communications path compensation.Therefore, a kind of communication control unit, radio communication device, communication control method and wireless communications method can be provided, the quantity of the grouping that can't reproduce that need abandon can be minimized owing to the delay of the time of advent.

Description of drawings

Fig. 1 shows the schematic diagram of employing according to the illustrative configurations of the communication system of the communicator of first embodiment of the invention;

Fig. 2 shows the functional block diagram of illustrative configurations of the critical piece of mobile communication terminal shown in Fig. 1 and home videos server.

Fig. 3 is the example according to the frequency band condition monitoring result of first embodiment of the invention;

Fig. 4 is another example according to the frequency band condition monitoring result of first embodiment of the invention;

Fig. 5 is the another example according to the frequency band condition monitoring result of first embodiment of the invention;

The ideal that Fig. 6 shows according to first embodiment of the invention receives method to set up regularly;

Fig. 7 shows the schematic diagram of employing according to the illustrative configurations of the communication system of the communicator of second embodiment of the invention;

Fig. 8 shows the functional block diagram of illustrative arrangement of the critical piece of mobile communication terminal shown in Fig. 7 and communication terminal;

Fig. 9 shows the example according to the frequency band condition monitoring result of third embodiment of the invention;

Figure 10 shows another example according to the frequency band condition monitoring result of third embodiment of the invention;

Figure 11 shows the another example according to the frequency band condition monitoring result of third embodiment of the invention;

Figure 12 is the schematic diagram according to the overall communication system of fifth embodiment of the invention;

Figure 13 is the functional block allocation plan of swap server shown in Figure 12

Figure 14 is the IP packet configuration figure according to embodiment shown in Figure 12;

Figure 15 is the functional block allocation plan of MN shown in Figure 1;

Figure 16 is according to fifth embodiment of the invention, the communication sequential chart carried out between swap server and MN;

Figure 17 is the functional block allocation plan of formation according to the swap server of the communication system of sixth embodiment of the invention;

Figure 18 is the functional block allocation plan of formation according to the MN of the communication system of sixth embodiment of the invention; And

Figure 19 shows method and the problem thereof of using the monitoring period to determine transmission band.

Description of reference numerals

1. mobile communication terminal

2. wireless network

3. network

4. home videos server

11. transmission/receiving element

12. image/tone decoding unit

13. display unit

14. voice-output unit

15. receive the packet monitoring unit

16. control unit

21. video accumulation unit

22. image/tone decoding unit

23. image/speech coding unit

24. transmission/receiving element

25. control unit

51. mobile communication terminal

52. image input unit

53. voice-input unit

54. image/speech coding unit

55. control unit

56. transmitting element

57. accumulation unit

58. receiving element

59. image/tone decoding unit

60. display unit

61. voice-output unit

62. reproduction units

63. receive the packet monitoring unit

71. communication terminal

10. communication system

10A, 10B. Wireless IP network

20. the Internet

30. relay center

40. user resident

41.IP telephone exchange unit

42.IP telephone terminal

100. swap server

101,103. communications interface units

105. packet relay unit

107,107 '. the frequency band computing unit

107A. first upwards allowed band the unit is set

107B. the first frequency band status determining unit upwards

107C. second upwards allowed band the unit is set

107D. the second frequency band status determining unit upwards

107A '. the first bandwidth assignment rate determining unit upwards

107C '. the second bandwidth assignment rate determining unit upwards

109. transmission packet allocation unit

111. main control unit

113. memory cell

200A, 200B.VPN router

(300.MN radio communication device)

301,303. wireless communication cards

305A, 305B. deliver IP address interface unit

307,307 '. the frequency band computing unit

307A. the first downward allowed band is provided with the unit

307B. the first downward frequency band status determining unit

307C. the second downward allowed band is provided with the unit

307D. the second downward frequency band status determining unit

307A '. the first downward bandwidth assignment rate determining unit

307C '. the second downward bandwidth assignment rate determining unit

309. transmission packet allocation unit

311. main control unit

313. memory cell

A1, A2. deliver the IP address

AH. household IP address

Embodiment

The preferred embodiments of the present invention are described below with reference to the accompanying drawings.

[first embodiment]

Fig. 1 shows the schematic diagram of employing according to the configuration of the communication system of the communicator of first embodiment of the invention.As shown in Figure 1, communicator mobile communication terminal 1 can be connected with wireless network 2 by wireless communications path.Wireless network 2 links to each other with cable network 3, and cable network 3 links to each other with home videos server 4.In the present embodiment, mobile communication terminal 1 links to each other with home videos server 4 by the network that comprises wireless network 2 and cable network 3, and reproduces by receiving the video data that transmits as grouping from home videos server 4.

Fig. 2 shows the functional block diagram of illustrative arrangement of the critical piece of mobile communication terminal 1 shown in Fig. 1 and home videos server 4.Mobile communication terminal 1 has: transmission/receiving element 11, image/tone decoding unit 12, display unit 13, voice-output unit 14, reception packet monitoring unit 15 and control unit 16.Transmission/receiving element 11 sends and receives grouping with wireless mode.To offer image/tone decoding unit 12 by the grouping that transmission/receiving element 11 receives, in image/tone decoding unit 12, respectively image coded data and vocoded data be decoded from home videos server 4.Then, decoded picture signal is offered display unit 13 with display image, and decoded voice signal is offered voice-output unit 14 with the output voice.

In addition, to offer by (RTP) grouping that transmission/receiving element 11 receives and receive packet monitoring unit 15 from home videos server 4, in receiving packet monitoring unit 15, based on the grouping that receives the frequency band state of wireless communications path in the wireless network 2 is monitored, and monitored results is offered control unit 16.Therefore, in the present embodiment, receive packet monitoring unit 15 and constitute frequency band condition monitoring unit.Below will describe by using this reception packet monitoring unit 15 to monitor the method for the frequency band state of wireless communications path.

Whole operations of control unit 16 control mobile communication terminals 1 are as authenticating by transmission/receiving element 11 same family video servers 4.In addition, control unit 16 produces the transmission band control messages based on the monitored results that receives packet monitoring unit 15, and the transmission band control messages that produces is sent to home videos server 4 as the control grouping by transmission/receiving element 11.In other words, when control unit 16 monitored results that 15 acquisition indication permission frequency bands have narrowed down from reception packet monitoring unit, control unit 16 produces the monitored results of this situation of indication, and by transmission/receiving element 11 this message is sent to home videos server 4.When the band recovery that narrowed down, control unit 16 produces the transmission band control messages of this situation of indication in an identical manner, and by transmission/receiving element 11 this message is sent to home videos server 4.Therefore, in the present embodiment, control unit 16 and transmission/receiving element 11 have constituted transmission band control messages transmitting element.

On the other hand, home videos server 4 comprises: video accumulation unit 21, image/tone decoding unit 22, image/speech coding unit 23, transmission/receiving element 24 and control unit 25.Video accumulation unit 21 accumulated videos.Image/tone decoding unit 2 will be accumulated in be decoded as image and voice respectively in the video accumulation unit 21 after, the video that image/speech coding unit 23 will be accumulated in the video accumulation unit 21 is encoded to image coded data and vocoded data respectively.Then, transmission/receiving element 24 is sent to network 3 with image coded data and vocoded data as grouping.Transmission/receiving element 24 can be connected to network 3 by wireless network wired or that be different from wireless network 2.

Whole operations of control unit 25 control home videos servers 4 are as authenticating with mobile communication terminal 1 by transmission/receiving element 24.In addition, control unit 25 is controlled, and with receiving indication from mobile communication terminal 1 when allowing transmission band control messages that frequency band narrowed down, reduces the image/view data of speech coding unit 23 and the encoding rate of speech data.After this, control unit 25 is controlled, and with when receiving the transmission band control messages of indication permission band recovery, improves encoding rate (quality improvement).Should be noted in the discussion above that encoding rate is by controlling such as methods such as changing quantization table or encoding scheme itself.

Below, the method that the frequency band state of wireless communications path is monitored in the reception packet monitoring unit 15 that uses mobile communication terminal 1 is described.

In the present embodiment, the reception of the grouping that receives based on the wireless communications path by wireless network 2 regularly is provided with apart from the ideal of the grouping of wireless communications path and receives allowed band regularly.Then, whether the reception of the grouping that receives by wireless communications path of monitoring is regularly in set allowed band.When regularly exceeding allowed band, detect the permission frequency band and narrow down.

Fig. 3 to 5 example according to the monitored results of the frequency band state of present embodiment.The packet transmission interval that Fig. 3 shows application is the situation of 80ms.The packet transmission interval that Fig. 4 shows application is the situation of 40ms, and the packet transmission interval that Fig. 5 shows application is the situation of 20ms.In addition, in Fig. 3 to 5, transverse axis express time, the longitudinal axis are represented the sequence number (SN) of dividing into groups.In addition, Tp shows apart from the ideal of the grouping of wireless communications path and receives allowed band regularly (being 60m herein), Dp shows the ideal reception potential delay time (being 80ms herein) regularly that is timed to the path from transmission packets, Tb shows apart from transmission packets reproduction regularly and allows the time (being 200ms herein), and Ds shows and is detained time of delay.

In Fig. 3 to 5, suppose that the permission frequency band of wireless communications path is narrowed 50% behind the moment t1 that receives grouping N1.In this case, when packet transmission interval was 80ms shown in Figure 3, at the moment t3 that receives next grouping N3 (by the black circles indication), the reception of grouping N3 was regularly outside allowed band Tp.Therefore, the permission frequency band that detects at moment t3 wireless communications path narrows down.In addition, be 240ms by the caused delay of grouping Ds time of delay that till moment t3, sends.Therefore, in this case, the quantity of the grouping that will abandon (with hatched circle) behind the fair line of reproduction only has 2.

In addition, be among Fig. 4 of 40ms in packet transmission interval, after moment t1 received grouping N1, when receiving the second grouping N3 (black circles) at moment t3, the reception of grouping N3 was regularly outside allowed band Tp.Therefore, the permission frequency band that detects at moment t3 wireless communications path narrows down.In addition, delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms.Therefore, in this case, reproduce to allow the quantity of the grouping that will abandon (among the figure with hatched circle) behind the line only to have 3.

Similarly, be among Fig. 5 of 20ms in packet transmission interval, after moment t1 received grouping N1, when receiving the 4th grouping N3 (black circles) at moment t3, the reception of grouping N3 was regularly outside allowed band Tp.Therefore, the permission frequency band that detects at moment t3 wireless communications path narrows down.In addition, delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms.Therefore, in this case, reproduce to allow the quantity of the grouping that will abandon (among the figure with hatched circle) behind the line only to have 6.

Below, describe the ideal shown in Fig. 3 to 5 and receive regularly and the method to set up of allowed band.For desirable the reception regularly is set, at first, as shown in Figure 6, determine to have the line L of inclination alpha, shown in inclination alpha according to using (as VoIP) indication transmitted in packets relation (t-SN) between (t) and sequence number (SN) constantly.For example, when according to application, when packet transmission interval is 20ms, determine to have α=the line L of 50 (SN/s).Then, suppose that the grouping that receives is positioned at along the grouping that receives in the scheduled time slot when drafting communication startup is initial on the SN-t coordinate diagram is arranged on the direction of certain delay with respect to line L.Then, when line L when mobile from left to right,, line L ' is set to desirable the reception regularly line L ' being moved to when not having the low order end position that receives the grouping point in its left side.

The ideal of below describing under such situation receives detailed calculated example regularly.At first, the reference line (SN-tstd) of supposing to be equivalent to the line L among Fig. 6 is:

SN＝αstd*tstd，tstd＝SN/αstd

Herein, α std is the slope that limits by using.For example, under the situation of VoIP, be 1SN/20ms (50SN/s).

Then, calculate reference line according to following formula and the grouping that receives between time difference (Tstdsub (s)):

Tstdsub(s)＝t(s)-tstd(s)。

For example, suppose that " s " receives to such an extent that the sequence number of grouping is SN (s), then

Tstdsub(s)＝t(s)-{SN(s)/αstd}。

Herein, receive the grouping (s) in, the minimum value (Tsubmin) of seeking time poor (Tstdsub).

[formula 1]

Tsub \min = \min_{s}^{ALL} (Tstdsub (s))

Suppose that the line based on Tsubmin is desirable receive regularly (SN-tass), then

tass＝(SN/αstd)+Tsubmin。

In other words, in the grouping that receives, will be defined as desirable the reception regularly based on the line (being equivalent to the L ' among Fig. 6) of (time of reception-delivery time) minimum grouping.

In addition, for example,, receive regularly, allowed band Tp is set, perhaps regularly calculate allowed band Tp is set by packet-based actual reception based on ideal mainly according to the Correspondent Node case or according to modulation scheme or employed transmission band.

When based on calculating and setting allowed band Tp, for example, the average received of the grouping that the initial period when communication starts receives in based on scheduled time slot regularly is provided with allowed band Tp.In other words, when the initial period when communication starts be provided with desirable receive regularly after, calculate the grouping trec time of reception and the desirable difference time that receives between timing t ide by following formula.

Tsub(s)＝trec(s)-tide(s)

Then, by following formula, the mean value (that is, receiving the mean value of expansion time of delay of grouping during the stabilized communication) based on difference time T sub calculates allowed band Tp.In following formula, s represents to distribute to the reception numbering of the grouping that receives in the scheduled time slot, and β represents coefficient, and average treatment is asked in " mean " expression.

[formula 2]

Tp = β \times \underset{s}{mean} Tsub (s)

Adopt this sample loading mode, by the allowed band Tp of wireless communications path is set, the reception of grouping is regularly compared with allowed band Tp, and the frequency band state of the corresponding wireless communications path of communication means of monitoring and wireless communications path, just can almost detect the fluctuation that changes the permission frequency band of (as decline) in accordance with communication environments in real time.Therefore, when detecting narrow-band, produce so transmission band control messages of indication, and this transmission band control messages is sent to destination---the home videos server 4 of grouping based on monitored results.Then, in family's video server 4, reduce the view data that will send and the encoding rate of speech data.So, in using in real time, just can minimize because the quantity of the grouping of reproducing that will be dropped that the delay of the time of advent causes.

[second embodiment]

Fig. 7 shows the schematic diagram of employing according to the illustrative configurations of the communication system of the communicator of second embodiment of the invention.As shown in Figure 7, communicator mobile communication terminal 51 can be connected with wireless network 2 by wireless communications path.Wireless network 2 links to each other with cable network 3, and cable network 3 links to each other with communication terminal 71 (as PC).On mobile communication terminal 51 and the communication terminal 71 communication software is installed.In the present embodiment, mobile communication terminal 51 links to each other with the network of cable network 3 by comprising wireless network 2 with communication terminal 71, and reciprocally sends and receive view data and speech data in real time.Communication terminal 71 can link to network 3 by wireless network wired or that be different from wireless network 2.

Fig. 8 shows the functional block diagram of illustrative arrangement of the critical piece of mobile communication terminal 1 shown in Fig. 7 and communication terminal 71.Mobile communication terminal 51 and communication terminal 71 have configuration much at one.Therefore, the configuration of mobile communication terminal 51 is below described.For the configuration of communication terminal 71, the assembly identical with mobile communication terminal 51 used identical reference marker, and save explanation same components.

Mobile communication terminal 51 comprises: image input unit 52, voice-input unit 53, image/speech coding unit 54, control unit 55, transmitting element 56 and accumulation unit 57.Image/speech coding unit 54 will be converted to image coded data or vocoded data by the view data of image input unit 52 acquisitions or the speech data that is obtained by voice-input unit 53 under the control of control unit 55, by transmitting element 56 image coded data or vocoded data are sent to Correspondent Node as grouping then.

57 accumulations of accumulation unit are such as files such as image, voice, texts.Be accumulated in the file of accumulation in the unit 57 according to the request that sends from control unit 55, be sent to Correspondent Node as grouping by transmitting element 56.

In addition, mobile communication terminal 51 comprises: receiving element 58, image/tone decoding unit 59, display unit 60, voice-output unit 61, reproduction units 62 and reception packet monitoring unit 63.To offer image/tone decoding unit 59 by the coded data from Correspondent Node (grouping) that receiving element 58 receives, in image/tone decoding unit 59, each data be decoded.Then, decoded picture signal is provided for display unit 60 with display image, and decoded voice signal is offered voice-output unit 61 with the output voice.

In addition, by the corresponding reproducting method of reproduction units 62 uses the file that receiving element 58 receives is reproduced with file.When reproducing signal is signals such as picture signal, reproducing signal is offered display unit 60 to show, when reproducing signal is signals such as voice signal, reproducing signal is offered voice-output unit 61 to export.

In addition, (RTP) grouping from Correspondent Node that receiving element 58 is received offers reception packet monitoring unit 63, in receiving packet monitoring unit 63, in the same identical mode of first embodiment, based on the grouping that receives, the frequency band state of the wireless communications path of monitoring wireless network 2, and monitored results offered control unit 55.Therefore, in the present embodiment, receive packet monitoring unit 63 and constitute frequency band condition monitoring unit.

Control unit 55 produces the transmission band control messages based on the monitored results from reception packet monitoring unit 63, and as the situation of first embodiment, by transmitting element 56 the transmission band control messages that is produced is sent to Correspondent Node.In other words, when control unit 55 monitored results that 63 acquisition indication permission frequency bands have narrowed down from reception packet monitoring unit, control unit 55 just produces the transmission band control messages of this situation of indication, and this message is sent to Correspondent Node by transmitting element 56, when narrow-band is recovered, control unit 55 produces the transmission band control messages of this situation of indication in an identical manner, and sends this message by transmitting element 56.Therefore, in the present embodiment, control unit 55 and transmitting element 56 have constituted transmission band control messages transmitting element.

In addition, control unit 55 sends the transmission band control messages to Correspondent Node, and based on the monitored results from reception packet monitoring unit 63, control will be sent to the transmission packets frequency band of Correspondent Node from himself terminal.In other words, when sending view data that obtains by image input unit 52 or the speech data that obtains by voice-input unit 53 during, when obtaining indication and allow monitored results that frequency bands have narrowed down from receiving packet monitoring unit 63, image/speech coding the unit 54 of himself terminal of control unit 55 control reduces the encoding rate of the data that will send or temporarily stops transmission.In addition, when be accumulated in transmission the file of accumulation in the unit 57 during, when obtaining indication and allowing monitored results that frequency band narrowed down, control unit 55 is controlled, to interrupt file transfer.Should be noted in the discussion above that as the situation of first embodiment encoding rate is to control by the method that changes quantization table or coding method itself.

After this, when when receiving packet monitoring unit 63 and obtain indication and allow the monitored results of band recoveries, control unit 55 sends the monitored results of this situation of indication to Correspondent Node, control the image/speech coding unit 54 of himself terminal simultaneously, improve the encoding rate (quality improvement) of the data that will send or begin to send.In addition, when because the frequency band that narrowed down, when the transmission that is accumulated in the file in the accumulation unit 57 was interrupted, control unit 55 was controlled, to restart the transmission of file.

On the other hand, when receiving indication from Correspondent Node when allowing transmission band control messages that frequency band narrowed down, control unit 55 is control chart picture/speech coding unit 54 in an identical manner, the encoding rate of the speech data that obtains with the view data that reduces to obtain or by voice-input unit 53 by image input unit 52, or temporarily stop to send.In addition, when transmission was accumulated in the file of accumulating in the unit 57, control unit 55 was controlled, to interrupt file transfer.

After this, when receiving indication when allowing the transmission band control messages of band recovery, control unit 55 control charts picture/speech coding unit 54 improves the encoding rate (quality improvement) of the data that will send or begin to send in an identical manner.In addition, when because narrow-band, when the transmission that is accumulated in the file in the accumulation unit 57 was interrupted, control unit 55 was controlled, to restart the transmission of file.Therefore, in the present embodiment, receiving element 58 has constituted transmission band control messages receiving element, and control unit 55 and image/speech coding unit 54 has constituted the transmission band control unit.

In addition, in the present embodiment, send each data in speech data and the view data in real time by corresponding RTP grouping, every kind of packet monitoring frequency band narrows down relatively.Then, when in a kind of grouping, detecting narrow-band, two kinds of grouping execution encoding rates are reduced processing,, one or both execution encoding rates in two kinds of groupings are reduced processing, or control data sends perhaps according to wireless status (for example RSSI).For example,, when transmission band has narrowed down, also reduce the packets of voice speed of the Correspondent Node of detected grouping, or stop the data transmission when detecting with respect to any grouping (for example packets of voice) even wireless status is good.On the other hand, when the transmission band that detects packets of voice under the wireless status that is worsening has narrowed down, reduce the speed of voice and image packets, or stop the data transmission.In addition, in the time can using group communication (groupcommunication) more than one Correspondent Node, can be to the above-mentioned control of the execution of each Correspondent Node.

In addition, in the present embodiment, situation as first embodiment, owing to be provided with the allowed band of wireless communications path, and the packet-based permission frequency band that relatively detects wireless communications path that receives between timing and allowed band narrows down, and therefore can almost detect wireless communications path in real time corresponding to the communication means of wireless communications path and narrow down.Therefore, for real-time application, can be by the speed of the grouping that will send from Correspondent Node and himself terminal or the transmission of data based on testing result control, in Correspondent Node and himself end, minimize because the quantity of the grouping of reproducing that will be dropped that the delay of the time of advent causes.

In addition, in above-mentioned first or second embodiment, for example, when the timing of the grouping that receives is in allowed band, calculate the shortest or the longest time difference of fixing time that receives regularly and be used for determining allowed band, calculate this based on this time difference then and allow frequency band.In first embodiment, the permission frequency band that calculates is sent to home videos server 4 sides as the transmission band control messages, and the encoding rate of the data that will send can be increased to and allows the corresponding encoding rate of frequency band.In a second embodiment, can be corresponding to allowing frequency band, the encoding rate of the data that raising will send from Correspondent Node or himself terminal.

In addition, in a second embodiment, especially when adopting Frequency Division Duplexing (FDD) (FDD), can save the control the transmission packet rates carried out in himself end based on the frequency band condition monitoring result of self end of Correspondent Node or data be sent the control of carrying out, at this moment, can be based on from the transmission band control messages control transmission packet rates of Correspondent Node or the transmission of data.

[the 3rd embodiment]

A third embodiment in accordance with the invention, in the communication system that comprises mobile communication terminal illustrated in figures 1 and 21 and home videos server 4, as described below, the transmission packets frequency band of wireless communications path is to monitor the frequency band state of wireless communications path by the reception packet monitoring unit 15 that uses mobile communication terminal 1, thereby control.

In other words, in the present embodiment, the transmission packets frequency band of wireless communications path is by the transmission packets interval corresponding monitoring period of setting with the wireless communications path of wireless network 2, regularly monitor the frequency band state of wireless communications path based on the reception of the sequential packet in the monitoring period, produce the transmission band control messages that is used for the control transmission frequency band based on monitored results, and, control to the destination of grouping transmission transmission band control messages.

Fig. 9 to 11 example according to the monitored results of the frequency band state of present embodiment.In Fig. 9, the packet transmission interval of application is 80ms.In Figure 10, the packet transmission interval of application is 40ms, and in Figure 11, the packet transmission interval of application is 20ms.In addition, in Fig. 9 to 11, transverse axis express time t, the longitudinal axis represent the sequence number (SN) of dividing into groups.In addition, Tm represent based on (corresponding to) the transmission packets monitoring period at interval.Other mark is with shown in Figure 19 identical.Dp represents that the ideal that is timed to the path from transmission packets receives the potential delay time regularly (being 80ms herein), and Tb represents to allow the time (being 200ms herein) apart from transmission packets reproduction regularly, and Ds represents to be detained time of delay.

In the present embodiment, for example, with the transmission packets that will send from home videos server 4 at interval corresponding monitoring period Tm be set to 5 transmission packets and divide into groups the periods.Then, calculate reception amount of deflection (displacement degree) α regularly of the IP grouping that in monitoring period Tm, receives according to following formula (1).Then, when based on the amount of deflection that calculates and with transmission packets at interval during corresponding threshold alpha th ， α ≦ α th, detect communication path and narrow down.In addition, in formula (1), s represents to distribute to the reception numbering of the grouping that receives in monitoring period Tm, and mean represents to ask average treatment, and SN represents the sequence number of IP grouping, and trec represents the time of reception.

[formula 3]

α = \underset{s}{mean} (\frac{SN (s + Δs) - SN (s)}{trec (s + Δs) - trec (s)}) \cdot \cdot \cdot (1)

By this way, when packet transmission interval in Fig. 9 is 80ms, Tm=400ms.When packet transmission interval in Figure 10 is 40ms, Tm=200ms, when packet transmission interval in Figure 11 is 20ms, Tm=100ms.In other words, packet transmission interval short more (transfer rate is high more), Tm is short more.Therefore, when during the transmitted in packets under the high transmission rates, allowing frequency band to narrow down, can reduce the quantity that is retained in the grouping in the communication path efficiently by detecting narrow-band rapidly.At this moment,, also can accurately detect narrow-band even during the transmitted in packets under the low transfer rate, allow frequency band to narrow down, and the less efficiently quantity that is retained in the grouping in the communication path.

For example, in Fig. 9 to 11, suppose that the permission frequency band of wireless communications path has been narrowed 50% behind the moment t1 that receives grouping N1.In packet transmission interval as shown in Figure 9 is under the situation of 80ms, suppose to detect narrow-band at the moment t3 of the monitoring period Tm (t2-t3) that receives next grouping N3 (black circles), delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms so.Therefore, in this case, reproduction allows the quantity of the grouping that will abandon (with hatched circle) behind the line only to have 2.

In addition, when packet transmission interval in Figure 10 is 40ms, suppose after moment t1 receives grouping N1, moment t3 at the monitoring period Tm (t2-t3) that receives next grouping N3 (black circles) detects narrow-band, and delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms so.Therefore, in this case, reproduction allows the quantity of the grouping that will abandon (with hatched circle) behind the line only to have 3.

Similarly, when packet transmission interval in Figure 11 is 20ms, suppose after moment t1 receives grouping N1, moment t3 at the monitoring period Tm (t2-t3) that receives next grouping N3 (black circles) detects narrow-band, and delay Ds time of delay that is caused by the grouping that sends till moment t3 is 160ms so.Therefore, in this case, reproduction allows the quantity of the grouping that will abandon (with hatched circle) behind the line only to have 2.

By this way, can be by being provided with and the corresponding monitoring of packet transmission interval period Tm, the reception amount of deflection α regularly of the grouping that calculating receives during monitoring period Tm, and based on the amount of deflection α that calculates and and the corresponding threshold alpha th of packet transmission interval between the frequency band state of relatively monitoring wireless communications path, come communication means, almost detect the fluctuation that changes the permission frequency band of (as decline) in accordance with communication environments in real time corresponding to wireless communications path.Therefore, when detecting narrow-band, produce the transmission band control messages of this situation of indication, and send it to the destination home videos server 4 of grouping based on monitored results, in family's video server 4, reduce the view data that will send and the encoding rate of speech data.So, just can minimize because the quantity of the grouping of reproducing that will be dropped that real-time delay of using the time of advent causes.

[the 4th embodiment]

A fourth embodiment in accordance with the invention, according to second embodiment shown in Fig. 7 and 8, comprise in the communication system of mobile communication terminal 51 and communication terminal 71, as the situation of the 3rd embodiment, mobile communication terminal 51 and the communication terminal 71 reception packet monitoring unit 63 in each is based on the received grouping of corresponding receiving element 58, the frequency band state of the wireless communications path of monitoring wireless network 2.Then, monitored results is provided for control corresponding unit 55.

As the situation of the 3rd embodiment, each control unit 55 produces the transmission band control messages based on from the monitored results that receives packet monitoring unit 63, and by receiving element 56 the transmission band control messages that is produced is sent to Correspondent Node.In other words, when receiving 63 places, packet monitoring unit and obtain indication and allow monitored results that frequency band narrowed down, control unit 55 produces the transmission band control messages of these situations of indication, and sends it to Correspondent Node.Then, when narrow-band was recovered, control unit 55 produced the transmission band control messages of this situation of indication in an identical manner, and sends it to Correspondent Node.Other operations are identical with those operations shown in second embodiment.Therefore, saved related description herein.

In addition, in the present embodiment, as the situation of the 3rd embodiment, because the frequency band state of wireless communications path is by being provided with and the corresponding monitoring of packet transmission interval period Tm, the reception amount of deflection α regularly of the grouping that calculating receives in monitoring period Tm, and compare with the amount of deflection α that calculates with the corresponding threshold alpha th of packet transmission interval and to monitor, therefore can be almost in real time and accurately detect wireless communications path and narrow down corresponding to the communication means of wireless communications path.Therefore, for real-time application, can be by the speed of the grouping that will send from Correspondent Node and himself terminal or the transmission of data based on monitored results control, in Correspondent Node and himself end, minimize because the quantity of the grouping of reproducing that will be dropped that the delay of the time of advent causes.

In addition, in above-mentioned third and fourth embodiment, be amount of deflection α with the mean value calculation of the reception timing difference between sequential packet.Yet in this case, amount of deflection α approaches current time more, just becomes crucial more.Therefore, can also by with amount of deflection α from averaging of the mode processing that current time more and more closely improves its weight coefficient, calculate amount of deflection α.In addition, because one or two grouping that receives may depart from desirable the reception regularly far away, therefore can change threshold alpha th far away according to the quantity of the grouping that departs from.That is, threshold alpha th increases with the increase of the number of packet that receives beyond receiving regularly in ideal.By this way, can prevent the flase drop survey.In addition, in this case, for example, can also obtain minimal gradient, threshold alpha th is set based on the statistic of the time of reception difference between the grouping that receives by computation sequence.In addition, can also based on the minimum value of the time of reception difference between the grouping that receives of order or every one receive grouping or every two receive grouping (or the like) between the minimum value of time of reception difference, threshold alpha th is set.

In addition, as amount of deflection α during, can make its transmission band of being wider than current time (higher transmission rate) based on both poor control transmission frequency bands greater than threshold alpha th.In addition, in the 4th embodiment, especially when adopting Frequency Division Duplexing (FDD) (FDD), can save the control the transmission packet rates carried out in himself end based on the frequency band condition monitoring result of self end of Correspondent Node or data be sent the control of carrying out.At this moment, can be based on from the transmission band control messages control transmission packet rates of Correspondent Node or the transmission of data.

In addition, if the monitoring period is corresponding with packet transmission interval, can be by monitoring in the quantity of monitoring the grouping that receives in the period, and will receive the quantity of grouping and compare with the quantity (threshold value) of the corresponding upcoming grouping that receives of packet transmission interval, monitor the frequency band state, and be unlike in the such amount of deflection of calculating among third and fourth embodiment.

[the 5th embodiment]

Below describe according to a fifth embodiment of the invention.

[the overall illustrative configurations of communication system]

Figure 12 is the general illustration according to the communication system 10 of fifth embodiment of the invention.As shown in figure 12, communication system 10 comprises Wireless IP network 10A and Wireless IP network 10B.Wireless IP network 10A (first Wireless IP network) is the IP network that can send the IP grouping.According to the position of radio communication device 300 (hereinafter to be referred as MN300), Wireless IP network 10A dynamically delivers IP address A1 (first delivers the IP address) to the MN300 distribution.In the present embodiment, Wireless IP network 10A adopts the cellular phone network of CDMA (particularly, the HRPD of 3GPP2 standard) as wireless communications method.

Wireless IP network 10B (second Wireless IP network) can send the IP grouping by the identical mode of Wireless IP network 10A.Wireless IP network 10B is MN300 distributing IP address A2 (second delivers the IP address).In the present embodiment, Wireless IP network 10B adopts and meets the mobile WiMAX of IEEE802.16e standard as wireless communications method.

In addition, when MN300 is connected to Wireless IP network 10A, Wireless IP network 10A will deliver IP address A1 and give MN300.Similarly, when MN300 is connected to Wireless IP network 10B, Wireless IP network 10B will deliver IP address A2 and give MN300.

In the present embodiment, deliver IP address A1 and deliver IP address A2 and household IP address AH (virtual address) to related.

Swap server 100 and MN300 can use

Wireless IP network

10A and 10B to communicate simultaneously.More specifically, swap server 100 and MN300 send and receive the IP grouping by using Wireless IP network 10A as main path.Then, when the frequency band (transmission speed) of main path is not enough,, use from the frequency band of path compensation deficiency by using Wireless IP network 10B as from the path.

Wireless IP network

10A and 10B are connected to the Internet 20.Relay center 30 links to each other with the Internet 20.

Relay center 30 has been equipped with network equipment, is used for the IP grouping that relaying is sent and received by MN300.More specifically, relay center 30 has been equipped with swap server 100 and

vpn routers

200A and 200B.

Swap server 100 is the wireless communications path of MN300 control.In the present embodiment, swap server 100 has constituted communication control unit.More specifically, swap server 100 can send the IP grouping to MN300 by Wireless IP network 10A, sends the IP grouping by Wireless IP network 10B to MN300 simultaneously.

Vpn routers

200A and 200B carry out route to IP grouping.In addition,

vpn routers

200A and 200B set up VPN (IPSec) tunnel at MN300 and 100 of swap servers.Can realize that the 3rd layer of OSI's is virtual by setting up the tunnel.Thereby, guarantee the IP mobility (IP mobility) of MN300.

In other words, in the present embodiment, different with mobile IP (as RFC2002), MN300 can use the main path and the communicating from path and Correspondent Node (particularly, the IP phone terminal 42) by Wireless IP network 10B foundation of setting up by Wireless IP network 10A simultaneously.

Relay center 30 (swap server 100) is connected to user resident 40 by the predetermined communications network (not shown).User resident 40 has been equipped with IP phone crosspoint 41 and IP phone terminal 42.The IP grouping that IP phone crosspoint 41 relaying predetermined communications network and IP phone terminal are 42 (particularly, VoIP grouping).IP phone terminal 42 is switched voice signal and VoIP grouping reciprocally, and sends and receive the IP grouping.

In other words, in the present embodiment, MN300 (radio communication device) communicates by swap server 100 (communication control unit) and IP phone terminal 42 (Correspondent Node).

The functional block configuration of communication system 10 then, is described.More specifically, the swap server 100 be included in the communication system 10 and the functional block configuration of MN300 are described.Below, the main description part relevant with the present invention.Therefore, should be noted in the discussion above that swap server 100 and MN300 can be equipped with the box (power supply etc.) of realizing that its function is necessary but also not shown or illustrate herein.

[the functional block configuration of swap server 100]

Figure 13 shows the functional block allocation plan of swap server 100.As shown in figure 13, swap server 100 comprises: communications interface unit 101, communications interface unit 103, packet relay unit 105, frequency band computing unit 107, transmission packet allocation unit 109, main control unit 111 and memory cell 113.

Communications interface unit 101 is connected to vpn routers 200A and 200B.For example, communication interface 101 can be made up of defined 1000 BASE-T of IEEE802.3ab.

In addition, as mentioned above, in the present embodiment, VPN is set by using IPSec.Therefore, by the IP grouping that communications interface unit 101 sends and receives, particularly, the VoIP grouping that sends between swap server 100 and MN300 and receive has the configuration shown in Figure 14 (a).Shown in Figure 14 (a), encapsulation household IP stem (household IP address AH), TCP/UDP stem and payload are delivered IP address (deliver IP address A1 or deliver IP address A2) to its interpolation.

In addition, the access control grouping that sends between swap server 100 and MN300 and receive has the configuration shown in Figure 14 (b).Access control grouping by the data link layer stem, deliver IP address, TCP stem and control routine and form.

Communications interface unit 103 is used for communicating at

IP phone crosspoint

41 and 42 at IP phone terminal.

The IP grouping that packet relay unit 105 relayings are sent and received by communications interface unit 101 and 103.More specifically, 105 pairs of edges, packet relay unit come from IP grouping the carrying out relaying of transmission packet allocation unit 109 or main control unit 111 directions.In addition, packet relay unit 105 comprises wobble buffer, absorbs the shake that

communications interface unit

101 and 103 received IP divide into groups.

In addition, in the present embodiment, packet relay unit 105 has constituted TU Trunk Unit, described TU Trunk Unit receives the IP grouping (VoIP grouping) that is sent to IP phone terminal 42 with predetermined period (20ms) from MN300, and they are relayed to IP phone terminal 42, receive simultaneously with predetermined period (20ms) and be sent to the IP grouping (VoIP grouping) of MN300, and they are relayed to MN300 from IP phone terminal 42.

Frequency band computing unit 107 calculates and receives from required Wireless IP network 10A of the IP grouping of MN300 and the frequency band (transmission speed) of 10B, and comprises: first upwards allowed band be provided with unit 107A, first upwards frequency band status determining unit 107B, second upwards allowed band upwards frequency band status determining unit 107D of unit 107C and second is set.

First upwards allowed band unit 107A is set first allowed band upwards is set, described first upwards the permission of the allowed band indication IP grouping that will receive by Wireless IP network 10A receive timing range.In addition, first upwards frequency band status determining unit 107B determine the upwards frequency band state of Wireless IP network 10A based on by the first upwards allowed band first upwards reception of allowed band and the grouping that receives by the Wireless IP network 10A comparison of fixing time that be provided with that unit 107A is provided with.

More specifically, first upwards allowed band unit 107A is set receives according to the ideal of the VoIP grouping of Wireless IP network 10A first allowed band upwards regularly be set.Then, first upwards frequency band status determining unit 107B detect the VoIP grouping by Wireless IP network 10A actual reception reception regularly whether set first upwards in the allowed band.As a result of, determine the current upwards transmission band (bandwidth assignment rate) that will be sent to the VoIP grouping of Wireless IP network 10A by MN300 be excellent be bad.In this case, if the reception of VoIP grouping, determines that current upwards transmission band is good regularly first upwards in the allowed band, otherwise, determine that current upwards transmission band is abominable.

Similarly, second upwards allowed band unit 107C is set second allowed band upwards is set, described second upwards the permission of the allowed band indication IP grouping that will receive by Wireless IP network 10B receive timing range.In addition, second upwards frequency band status determining unit 107D determine the upwards frequency band state of Wireless IP network 10B based on by the second upwards allowed band second upwards reception of allowed band and the grouping that receives by the Wireless IP network 10B comparison of fixing time that be provided with that unit 107C is provided with.

More specifically, second upwards allowed band unit 107C is set receives according to the ideal of the VoIP grouping of Wireless IP network 10B second allowed band upwards regularly be set.Then, second upwards frequency band status determining unit 107D detect the VoIP grouping by Wireless IP network 10B actual reception reception regularly whether set second upwards in the allowed band.As a result of, determine the current upwards transmission band (bandwidth assignment rate) that will be sent to the VoIP grouping of Wireless IP network 10B by MN300 be excellent be bad.In this case, if the reception of VoIP grouping, determines that current upwards transmission band is good regularly second upwards in the allowed band, otherwise, determine that current upwards transmission band is abominable.

Upwards the method to set up of allowed band and the upwards frequency band state of

Wireless IP network

10A and 10B are determined method below to describe above-mentioned first and second.

Transmission packet allocation unit 109 distributes the IP that sends grouping from communications interface unit 101 by packet relay unit 105 to

Wireless IP network

10A and 10B.

More specifically, transmission packet allocation unit 109 is based on the transmission band control messages (the first downward control information transmission) of the Wireless IP network 10A that is received from MN300 by main control unit 111, to comprising that the IP grouping interpolation from the household IP address AH that IP phone terminal 42 receives delivers IP address A1.Then, send the IP grouping of delivering IP address A1 to Wireless IP network 10A from communications interface unit 101 with interpolation.

In addition, transmission packet allocation unit 109 is based on the transmission band control messages (the second downward control information transmission) of the Wireless IP network 10B that is received from MN300 by main control unit 111, to comprising that the IP grouping interpolation from the household IP address AH that IP phone terminal 42 receives delivers IP address A2.Then, send the IP grouping of delivering IP address A2 to Wireless IP network 10B from communications interface unit 101 with interpolation.

Main control unit 111 controls will be sent to the grouping of MN300 and the wireless communications path that will divide into groups from the IP that MN300 receives.In addition, 111 pairs of access control groupings of main control unit are handled.

Particularly, in the present embodiment, main control unit 111 based on frequency band computing unit 107 first upwards frequency band status determining unit 107B to upwards definite result of frequency band state of Wireless IP network 10A, produce transmission band control messages (first upwards control information transmission), will be sent to the VoIP transmission packets frequency band of Wireless IP network 10A by MN300 with control, and send the transmission band control messages to MN300 by Wireless IP network 10A or 10B.More specifically, when first when upwards frequency band status determining unit 107B determines that current transmission band is abominable, main control unit 111 is controlled, to reduce the bandwidth assignment rate (slower transmission band) that will be sent to the VoIP grouping of Wireless IP network 10A by MN300.When definite current transmission band was good, main control unit 111 produced and is used to keep the transmission band control messages of transmission band, and sends it to MN300.Should be noted in the discussion above that the transmission band control messages utilizes access control grouping (referring to Figure 14 (b)) to send and receive.

Similarly, main control unit 111 based on frequency band computing unit 107 second upwards frequency band status determining unit 107D to upwards definite result of frequency band state of Wireless IP network 10B, produce transmission band control messages (second upwards control information transmission), will be sent to the VoIP transmission packets frequency band of Wireless IP network 10B by MN300 with control, and send the transmission band control messages to MN300 by Wireless IP network 10B or 10A.More specifically, when second when upwards frequency band status determining unit 107D determines that current transmission band is abominable, main control unit 111 is controlled, to reduce the bandwidth assignment rate (slower transmission band) that will be sent to the VoIP grouping of Wireless IP network 10B by MN300.Then, when definite current transmission band was good, main control unit 111 produced and is used to keep the transmission band control messages of transmission band, and sends it to MN300.

In addition, main control unit 111 has: based on the transmission band control messages that is sent to Wireless IP network 10A that receives from MN300 (the first downward control information transmission), calculate the function of the VoIP transmission packets frequency band that will be sent to Wireless IP network 10B; And, calculate the function of the VoIP transmission packets frequency band that will be sent to Wireless IP network 10A based on the transmission band control messages that is sent to Wireless IP network 10B that receives from MN300 (the second downward control information transmission).In the present embodiment, main control unit 111 has constituted first transmission control unit and second transmission control unit upwards upwards.

In addition, main control unit 111 is checked the order of the IP grouping that receives by Wireless IP network 10A and 10B.In the present embodiment, main control unit 111 is checked and is included at MN300 and the sequence number (SN) of the RTP (RTP) in 42 at IP phone terminal sends and the VoIP of reception divide into groups.In addition, main control unit 111 can obtain to be undertaken by packet relay unit 105 statistical information (for example, the in shortage and spill-out of packet loss, throughput and wobble buffer) of the IP grouping of relaying, and the information that is obtained is sent to MN300.

Memory cell 113 storages provide the application program of swap server 100 functions etc.In addition, memory cell 113 also store with such as relevant information of network such as

Wireless IP network

10A and 10B.

Particularly, in the present embodiment, memory cell 113 storage with deliver IP address A1 and deliver the be associated household IP address AH of MN300 of IP address A2.More specifically, main control unit 111 is stored the household IP address AH that delivers IP address A1, delivers IP address A2 and notified by MN300 at storing storage units 113.In the present embodiment, main control unit 111 and memory cell 113 have constituted the virtual address acquiring unit.

In addition, main control unit 111 can be with respect to the household IP address that is registered in the home agent (not shown) that can conduct interviews by the Internet 20, and checking is included in the household IP address AH in the IP grouping that is sent by IP phone terminal 42.By the checking of main control unit 111, can determine that telecom operators are the household IP address AH that MN300 distributes.

[the functional block configuration of MN300]

Figure 15 is the functional block configuration of MN300.MN300 can communicate by using

Wireless IP network

10A and 10B simultaneously according to the mode identical with swap server 100.By accident, saved explanation to the functional block similar to the functional block of describing at swap server 100.

As shown in figure 15, MN300 comprises: wireless communication card 301, wireless communication card 303, deliver IP address interface unit 305A, deliver IP address interface unit 305B, frequency band computing unit 307, transmission packet allocation unit 309, main control unit 311 and memory cell 313.

The radio communication of the wireless communications method (HRPD of 3GPP2 standard) that wireless communication card 301 execution Wireless IP network 10A are adopted.In the present embodiment, wireless communication card 301 receives IPs groupings (VoIP grouping) by Wireless IP network 10A to 42 transmissions of IP phone terminal and from IP phone terminal 42 with predetermined period (as 20ms).

Wireless communication card 303 is carried out the radio communication that meets the wireless communications method (mobile WiMAX) that is adopted by Wireless IP network 10B.

Deliver IP address interface unit 305A and be connected to wireless communication card 301.Deliver IP address interface unit 305A and send and receive the IP grouping based on the IP address A1 that delivers that in Wireless IP network 10A, distributes to MN300.

Deliver IP address interface unit 305B and be connected to wireless communication card 303.Deliver IP address interface unit 305B and send and receive the IP grouping based on the IP address A2 that delivers that in Wireless IP network 10B, distributes to MN300.

Frequency band computing unit 307 calculates and receives from required Wireless IP network 10A of the IP grouping of swap server 100 and the frequency band (transmission speed) of 10B, and comprises: the first downward allowed band is provided with unit 307A, the first downward frequency band status determining unit 307B, the second downward allowed band is provided with the unit 307C and the second downward frequency band status determining unit 307D.The function of the detailed functions of frequency band computing unit 307 and above-mentioned frequency band computing unit 107 much at one.

In other words, the first downward allowed band is provided with unit 307A the first downward allowed band is set, and the permission that the described first downward allowed band indication will be divided into groups by the IP that Wireless IP network 10A receives receives timing range.In addition, the downward frequency band state of Wireless IP network 10A is determined in the comparison that the first downward frequency band status determining unit 307B fixes time based on the reception that the first downward allowed band that unit 307A is provided with and the grouping by Wireless IP network 10A reception are set by the first downward allowed band.

More specifically, the first downward allowed band is provided with unit 307A and according to the ideal reception that the VoIP among the Wireless IP network 10A divides into groups the first downward allowed band is set regularly.Then, the first downward frequency band status determining unit 307B detect the VoIP grouping by Wireless IP network 10A actual reception reception regularly whether in the first set downward allowed band.As a result of, determine the current downward transmission band (bandwidth assignment rate) that will be sent to the VoIP grouping of Wireless IP network 10A by swap server 100 be excellent be bad.In this case, if the reception timing of VoIP grouping determines that current downward transmission band is good in the first downward allowed band, otherwise, determine that current downward transmission band is abominable.

Similarly, the second downward allowed band is provided with unit 307C the second downward allowed band is set, and the permission that the described second downward allowed band indication will be divided into groups by the IP that Wireless IP network 10B receives receives timing range.In addition, the downward frequency band state of Wireless IP network 10B is determined in the comparison that the second downward frequency band status determining unit 307D fixes time based on the reception that the second downward allowed band that unit 307C is provided with and the grouping by Wireless IP network 10B reception are set by the second downward allowed band.

More specifically, the second downward allowed band is provided with unit 307C and receives according to the ideal of the VoIP of Wireless IP network 10B grouping the second downward allowed band regularly is set.Then, the second downward frequency band status determining unit 307D detect the VoIP grouping by Wireless IP network 10B actual reception reception regularly whether in the second set downward allowed band.As a result of, determine the current downward transmission band (bandwidth assignment rate) that will be sent to the VoIP grouping of Wireless IP network 10B by swap server 100 be excellent be bad.In this case, if the reception timing of VoIP grouping determines that current downward transmission band is good in the second downward allowed band, otherwise, determine that current downward transmission band is abominable.

Below describe the method to set up of the above-mentioned first and second downward allowed bands and the downward frequency band state of

Wireless IP network

10A and 10B and determine method.

The transmission band control messages that transmission packet allocation unit 309 receives from swap server 100 based on main control unit 311 (first upwards control information transmission) produces the IP grouping that comprises household IP address AH and deliver IP address A1.Send the IP grouping that is produced from main control unit 311 to Wireless IP network 10A by delivering IP address interface unit 305A and wireless communication card 301.

In addition, the transmission band control messages that receives from swap server 100 based on main control unit 311 of transmission packet allocation unit 309 (second upwards control information transmission) produces the IP grouping that comprises household IP address AH and deliver IP address A2.Send the IP grouping that is produced from main control unit 311 to Wireless IP network 10B by delivering IP address interface unit 305B and wireless communication card 303.

Main control unit 311 is controlled grouping that will be sent to swap server 100 and the wireless communications path that will divide into groups from the IP that swap server 100 receives according to the mode identical with the main control unit 111 (referring to Figure 13) of swap server 100.In addition, 311 pairs of access control groupings of main control unit are handled.

In the present embodiment, main control unit 311 is based on the first downward frequency band status determining unit 307B of the frequency band computing unit 307 definite result to the downward frequency band state of Wireless IP network 10A, produce transmission band control messages (the first downward control information transmission), will be sent to the VoIP transmission packets frequency band of Wireless IP network 10A by swap server 100 with control, and send the transmission band control messages to swap server 100 by Wireless IP network 10A or 10B.More specifically, when the first downward frequency band status determining unit 307B determined that current transmission band is abominable, main control unit 311 was controlled, to reduce the bandwidth assignment rate that will be sent to the VoIP grouping of Wireless IP network 10A by swap server 100.Then, when definite current transmission band was good, main control unit 311 produced and is used to keep the transmission band control messages of transmission band, and sends it to swap server 100.

Similarly, main control unit 311 is based on the second downward frequency band status determining unit 307D of the frequency band computing unit 307 definite result to the downward frequency band state of Wireless IP network 10B, produce transmission band control messages (the second downward control information transmission), will be sent to the VoIP transmission packets frequency band of Wireless IP network 10B by swap server 100 with control, and send the transmission band control messages to swap server 100 by Wireless IP network 10B or 10A.More specifically, when the second downward frequency band status determining unit 307D determines that current transmission band is abominable, main control unit 311 is controlled, to reduce the bandwidth assignment rate that will be sent to the VoIP grouping of Wireless IP network 10B by swap server 100, and when definite current transmission band is good, main control unit 311 produces and is used to keep the transmission band control messages of transmission band, and sends it to swap server 100.

In addition, main control unit 311 has: based on the transmission band control messages that is sent to Wireless IP network 10A that receives from swap server 100 (first upwards control information transmission), calculate the function of the VoIP transmission packets frequency band that will be sent to Wireless IP network 10B; And, calculate the function of the VoIP transmission packets frequency band that will be sent to Wireless IP network 10A based on the transmission band control messages that is sent to Wireless IP network 10B that receives from swap server 100 (second upwards control information transmission).In the present embodiment, main control unit 311 has constituted the first downward transmission control unit and the second downward transmission control unit.

In addition, as the situation of the main control unit 111 of swap server 100, main control unit 311 check be included in will be to IP phone terminal 42 that send and will be from the sequence number (SN) of the RTP (RTP) the IP grouping that IP phone terminal 42 receives.In addition, main control unit 311 can obtain to indicate the radio communication of carrying out at

wireless communication card

301 and 303 places quality (as, throughput, SINR, RSSI, DRC and through-put power), and estimate (downwards and upwards) frequency band of Wireless IP network 10A that signal post needs and 10B based on the information that obtained.

Memory cell 313 storages provide the application program of MN300 function etc.In addition, memory cell 313 is also stored and is delivered IP address A1 and deliver the household IP address AH of the MN300 that IP address A2 is associated.In this embodiment, memory cell 313 has constituted the virtual address memory cell.

[allowed band method to set up and frequency band state are determined method]

Then, describe at the method to set up that allows frequency band up and down of each network among above-mentioned Wireless IP network 10A and the 10B and definite method of frequency band state.

In the present embodiment, as the situation of first embodiment, among swap server 100 and the MN300 each is based on the reception timing of the grouping that receives by each wireless communications path, be provided with apart from the ideal reception allowed band regularly of the grouping of wireless communications path, whether the reception of the grouping that detection receives by wireless communications path is regularly in set allowed band, determine whether current frequency band state is suitable, be used for the transmission band control messages of control transmission frequency band based on definite result's generation, and the transmission band control messages be sent to the destination of grouping.Thereby, the transmission packets frequency band of control wireless communications path.

As mentioned above, in the present embodiment, use Wireless IP network 10A to send and receive the IP grouping as main path herein.When the frequency band (transmission speed) of main path is not enough,, use from path compensation Wireless IP network 10A by using Wireless IP network 10B as from the path.Therefore, for example, as shown in figure 19, suppose to receive the VoIP grouping that will send at interval with 20ms, if main path or be 25% from the bandwidth assignment rate in path, so as shown in Figure 3, the packet transmission interval in path is 80ms.Therefore, when the bandwidth assignment rate was 50%, as shown in Figure 4, the packet transmission interval in path was 40ms.Then, when the bandwidth assignment rate was 100%, as shown in Figure 5, the packet transmission interval in path was 20ms.

Under the transmission state of the frequency band transmission speed shown in Fig. 3 to 5, suppose that the permission frequency band of wireless communications path has been narrowed 50% behind the moment t1 that receives grouping N1.In this case, as the situation of first embodiment, when the bandwidth assignment rate was 25% as shown in Figure 3, at the moment t3 that receives next grouping N3 (by the black circles indication), the reception of grouping N3 was regularly outside allowed band Tp.Therefore, the permission frequency band that detects at moment t3 wireless communications path narrows down.Therefore, can determine that transmission band (bandwidth assignment rate) is improper.In addition, be 240ms by the caused delay of grouping Ds time of delay that till moment t3, sends.Therefore, in this case, the quantity of the grouping that will abandon (with hatched circle) behind the fair line of reproduction only has 2.

In the bandwidth assignment rate was Fig. 4 of 50%, as the situation of first embodiment, after moment t1 received grouping N1, when receiving the second grouping N3 (black circles) at moment t3, the reception of grouping N3 was regularly outside allowed band Tp.Therefore, the permission frequency band that detects at moment t3 wireless communications path narrows down.Therefore, can determine that transmission band (bandwidth assignment rate) is improper.In addition, delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms.Therefore, in this case, reproduce to allow the quantity of the grouping that will abandon (among the figure with hatched circle) behind the line only to have 3.

Similarly, in the bandwidth assignment rate was Fig. 5 of 100%, as the situation of first embodiment, after moment t1 received grouping N1, when receiving the 4th grouping N3 (black circles) at moment t3, the reception of grouping N3 was regularly outside allowed band Tp.Therefore, the permission frequency band that detects at moment t3 wireless communications path narrows down.Therefore, can determine that transmission band (bandwidth assignment rate) is improper.In addition, delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms.Therefore, in this case, reproduce to allow the quantity of the grouping that will abandon (among the figure with hatched circle) behind the line only to have 6.

In addition, in the present embodiment, for swap server 100, the allowed band Tp shown in Fig. 3 to 5 is equivalent to first second allowed band upwards of allowed band or Wireless IP network 10B upwards of Wireless IP network 10A.For MN300, allowed band Tp is equivalent to the first downward allowed band of Wireless IP network 10A or the second downward allowed band of Wireless IP network 10B.

By this way, by direction up and down allowed band Tp is set respectively for

Wireless IP network

10A and 10B, and comparison by fixing time based on allowed band Tp among swap server 100 and the MN300 and branch group of received, when receiving regularly outside allowed band Tp, the permission frequency band of determining wireless communications path narrows down, and just can almost detect the fluctuation that changes the permission frequency band of (as decline) in accordance with communication environments according to the communication means of each wireless communications path in real time.Therefore, the destination that also this transmission band control messages is sent to grouping by the transmission band control messages that is used for the control transmission frequency band based on definite result's generation (is MN300 for swap server 100, for MN300 is swap server 100) mode control the transmission band of wireless communications path, can minimize because the quantity of the grouping of reproducing that will be dropped that the delay of the time of advent causes at real-time application (as VoIP).

[operation of communication system]

The operation of above-mentioned communication system then, is described with reference to Figure 16.Figure 16 is the communication sequential chart of carrying out between swap server 100 and MN300.As shown in figure 16, in step S10, swap server 100 and MN300 send and receive the VoIP grouping by Wireless IP network 10A (main path) and the Internet 20.At 42 at MN300 and IP phone terminal, VoIP grouping and voice communication are sent and receive (referring to Figure 12) together.

More specifically, MN300 sends the IP grouping, encapsulated in the IP grouping comprise distribute to IP phone terminal 42 the IP address at interior payload and household IP address AH, and use and deliver IP address A1 as sending address (referring to Figure 14 (a)).

In the initial period that the communication by Wireless IP network 10A starts, swap server 100 by frequency band computing unit 107 first upwards allowed band first allowed band upwards that unit 107A is provided with Wireless IP network 10A is set, MN300 is provided with the first downward allowed band that unit 307A is provided with Wireless IP network 10A by the first downward allowed band of frequency band computing unit 307.

In addition, carry out " black square " (following this point is suitable equally) in the signature on the network of route by it in VoIP grouping.In step S10, carry out route by 20 pairs of all VoIP groupings of Wireless IP network 10A (main path) and the Internet.

After this, in step S20A, the first downward frequency band status determining unit 307B of MN300 service band computing unit 307, reception by detecting the VoIP grouping by Wireless IP network 10A actual reception regularly whether in the first downward allowed band that 307A setting in unit is set by the first downward allowed band, is determined the quality of current transmission band.In addition, in step S20B, the first frequency band status determining unit 107B upwards of swap server 100 service band computing units 107, reception by detecting the VoIP grouping by Wireless IP network 10A actual reception regularly whether by first upwards allowed band be provided with that unit 107A is provided with first upwards in the allowed band, determine the quality of current transmission band.

In step S30A, if first when upwards frequency band status determining unit 107B determines that current transmission band is abominable, swap server 100 produces and is used for the control transmission frequency band, to be sent to the transmission band control messages (first upwards control information transmission) of bandwidth assignment rate of the VoIP grouping of Wireless IP network 10A by MN300 to reduce, and send it to MN300.

In step S30B, when if the first downward frequency band status determining unit 307B determines that current transmission band is abominable, MN300 produces and to be used for the control transmission frequency band and will to be sent to the transmission band control messages (the first downward control information transmission) of bandwidth assignment rate of the VoIP grouping of Wireless IP network 10A by swap server 100 to reduce, and sends it to swap server 100.

In step S40A, swap server 100 is based on the transmission band control messages (the first downward control information transmission) that receives from MN300, control will be sent to the VoIP transmission packets frequency band of Wireless IP network 10A, and the VoIP grouping is sent to Wireless IP network 10A.

In step S40B, MN300 is based on the transmission band control messages that receives from swap server 100 (first upwards control information transmission), control will be sent to the VoIP transmission packets frequency band of Wireless IP network 10A, and the VoIP grouping is sent to Wireless IP network 10A.

In step S50A, swap server 100 is based on the transmission band control messages (the first downward control information transmission) that receives from MN300, calculating will be sent to the VoIP transmission packets frequency band of Wireless IP network 10B (from the path), and, the VoIP grouping is sent to Wireless IP network 10B based on the transmission band that calculates.

In step S50B, MN300 is based on the transmission band control messages that receives from swap server 100 (first upwards control information transmission), calculating will be sent to the VoIP transmission packets frequency band of Wireless IP network 10B (from the path), and, the VoIP grouping is sent to Wireless IP network 10B based on the transmission band that calculates.

In above-mentioned steps S50A and S50B, carry out route by 20 pairs of VoIP groupings of Wireless IP network 10B and the Internet.In other words, compensate the frequency band of Wireless IP network 10A deficiency with Wireless IP network 10B.

In the initial period that the communication that compensates by Wireless IP network 10B starts, in swap server 100, by frequency band computing unit 107 second upwards allowed band second allowed band upwards that unit 107C is provided with Wireless IP network 10B is set, and in MN300, the second downward allowed band by frequency band computing unit 307 is provided with the second downward allowed band that unit 307C is provided with Wireless IP network 10B.

After this, for Wireless IP network 10B, receive the VoIP grouping at every turn, swap server 100 is based on receiving regularly and the second set upwards comparison between allowed band, determine current transmission band be excellent be bad, produce transmission band control messages (second upwards control information transmission) based on definite result, and send it to MN300.In addition, receive the VoIP grouping at every turn, MN300 is based on receiving regularly and the comparison between the second set downward allowed band, determine current transmission band be excellent be bad, produce transmission band control messages (the second downward control information transmission) based on definite result, and send it to swap server 100.

Therefore, swap server 100 distributes the VoIP grouping that receives from IP phone terminal 42 based on the transmission band control messages (the second downward control information transmission) that receives from MN300 to Wireless IP network 10B, and sends the VoIP grouping to it.In addition, MN300 distributes the VoIP grouping to Wireless IP network 10B, and sends the VoIP grouping to it based on the transmission band control messages that receives from swap server 100 (second upwards control information transmission).

Similarly, for Wireless IP network 10A (main path), receive the VoIP grouping at every turn, swap server 100 is based on receiving regularly and the first set upwards comparison between allowed band, determine current transmission band be excellent be bad, produce transmission band control messages (first upwards control information transmission) based on definite result, and send it to MN300.In addition, receive the VoIP grouping at every turn, MN300 is based on receiving regularly and the comparison between the first set downward allowed band, determine current transmission band be excellent be bad, produce transmission band control messages (the first downward control information transmission) based on definite result, and send it to swap server 100.

Therefore, swap server 100 distributes the VoIP grouping that receives from IP phone terminal 42 based on the transmission band control messages (the first downward control information transmission) that receives from MN300 to Wireless IP network 10A, and sends the VoIP grouping to it.In addition, MN300 distributes the VoIP grouping to Wireless IP network 10A, and sends the VoIP grouping to it based on the transmission band control messages that receives from swap server 100 (first upwards control information transmission).

In addition, for example, in swap server 100 and MN300, prepare a plurality of transmission bands (bandwidth assignment rate) that are used to control respectively in advance.Then, receive when being used to reduce the transmission band control messages of bandwidth assignment rate, from minimum speed limit, by ascending order selective sequential bandwidth assignment rate at every turn.

As mentioned above, swap server 100 according to present embodiment, because VoIP grouping is based on the transmission band control messages (the first downward control information transmission and the second downward control information transmission) that receives from MN300 and distributes to

Wireless IP network

10A and 10B, therefore the VoIP grouping can accurately be sent to MN300, compensates the frequency band of Wireless IP network 10A deficiency simultaneously with Wireless IP network 10B.

Similarly, MN300 according to present embodiment, because VoIP grouping is based on the transmission band control messages that receives from swap server 100 (first upwards control information transmission and second upwards control information transmission) and distributes to

Wireless IP network

10A and 10B, therefore the VoIP grouping can accurately be sent to swap server 100, compensates the frequency band of Wireless IP network 10A deficiency simultaneously with Wireless IP network 10B.

In addition, because the transmission band control messages is by the reception allowed band regularly of VoIP grouping is set respectively with respect to the direction up and down of

Wireless IP network

10A and 10B in swap server 100 and MN300, based on relatively producing of fixing time of set allowed band and actual reception, therefore can detect the frequency band fluctuation by communication means in real time, come the control transmission frequency band according to Wireless IP network 10A and 10B.Therefore, can minimize because the quantity of the grouping of reproducing that will be dropped that the delay of the time of advent causes for the VoIP application.

In addition, in the present embodiment, communication system 10 comprises Wireless IP network 10A and 10B.Yet, should be noted in the discussion above that and can use more Wireless IP network.In addition, though on two directions up and down the transmission band of undercompensation, can compensate transmission band in the direction up or down in one embodiment.In addition, the wireless communication card 301 of MN300 and 303 can be the radio-cell that is embedded among the MN300.

In addition, if the timing of the grouping that receives is outside allowed band the time, time difference based on indication bias is calculated the bandwidth assignment rate, and the bandwidth assignment rate that calculates can be sent to the grouping transmitter side as the transmission band control messages, perhaps the above-mentioned time difference can be sent to the grouping transmitter side as the transmission band control messages, make transmitter side to calculate the bandwidth assignment rate based on this time difference, thus can the control transmission frequency band.

In addition, should be noted in the discussion above that based on transmission band control messages control transmission frequency band and be not limited to corresponding wireless path.Can also be applied to another wireless path simultaneously, to allow mutual compensation.In addition, if also have another wireless path to use, this wireless path can be used for the compensation amount of narrowing down.For example, in swap server 100, when based on from the transmission band control messages (the second downward control information transmission) of MN300 when having reduced the bandwidth assignment rate of the grouping that will be sent to Wireless IP network 10B, can the control transmission frequency band, the bandwidth assignment rate of the grouping that will be sent to Wireless IP network 10A is increased, with the compensation reduction, or control, thereby can use another wireless path compensation reduction.

In addition, for example, when the timing of the grouping that receives is in corresponding allowed band, calculate the shortest or the longest time difference of fixing time that receives regularly and be used for determining allowed band, calculate the bandwidth assignment rate that is higher than current bandwidth assignment rate based on this time difference then.Then, the bandwidth assignment rate that calculates the grouping transmitter side can be sent to as the transmission band control messages, perhaps the above-mentioned time difference grouping transmitter side can be sent to as the transmission band control messages.Therefore, at transmitter side, can come the control transmission frequency band by calculating the bandwidth assignment rate that is higher than current bandwidth assignment rate based on the time difference.

[the 6th embodiment]

In according to a sixth embodiment of the invention, with comparing according to the communication system 10 of the 5th embodiment shown in Figure 12 to 16, definite method of frequency band state is different.Therefore, the part of swap server 100 and MN300 configuration is different.Below the main difference of describing with the 5th embodiment.

[the functional block configuration of swap server 100]

Figure 17 is the functional block configuration of formation according to the swap server 100 of the communication system of the 6th embodiment.For swap server 100, the configuration of frequency band computing unit 107 ' is different from the configuration according to the frequency band computing unit of the swap server 100 shown in the 5th embodiment.In other words, frequency band computing unit 107 ' calculates and receives from required Wireless IP network 10A of the IP grouping of MN300 and the frequency band (transmission rate) of 10B, and comprises: first bandwidth assignment rate determining unit 107A ', first frequency band status determining unit 107B, second bandwidth assignment rate determining unit 107C ' and the second frequency band status determining unit 107D upwards upwards upwards upwards.

First upwards bandwidth assignment rate determining unit 107A ' determine to be sent to the bandwidth assignment rate of the IP grouping of Wireless IP network 10A by MN300.In addition, first upwards frequency band status determining unit 107B based on first reception of upwards monitoring the order IP grouping that receives by Wireless IP network 10A in the period regularly, based on the first determined bandwidth assignment rate of bandwidth assignment rate determining unit 107A ' upwards, determine the frequency band state that makes progress of Wireless IP network 10A.

In this case, first upwards bandwidth assignment rate determining unit 107A ' based on the transmission band control messages (the first downward control information transmission) of the Wireless IP network 10A that for example receives from MN300, by Wireless IP network 10A actual reception the IP grouping receiving velocity or be sent to the transmission band control messages (first make progress control information transmission) of the Wireless IP network 10A of MN300, determine the bandwidth assignment rate of Wireless IP network 10A.

In addition, for example, first upwards frequency band status determining unit 107B based on the first determined bandwidth assignment rate of bandwidth assignment rate determining unit 107A ' upwards, calculating will be in the first reception amount of deflection regularly of upwards monitoring in the period IP grouping that receives by Wireless IP network 10A, and with the amount of deflection that calculates and with first upwards the corresponding threshold value of the determined bandwidth assignment rate of bandwidth assignment rate determining unit 107A ' compare.Then, determine to be sent to the current upwards quality of transmission band (bandwidth assignment rate) of the IP grouping of Wireless IP network 10A by MN300.In this case,, determine that frequency band is in good condition,, determine that frequency band is in bad condition if amount of deflection is equal to or less than threshold value if amount of deflection surpasses threshold value.

Similarly, second upwards bandwidth assignment rate determining unit 107C ' determine to be sent to the bandwidth assignment rate of the IP grouping of Wireless IP network 10B by MN300.In addition, second upwards frequency band status determining unit 107D based on second reception of upwards monitoring the order IP grouping that receives by Wireless IP network 10B in the period regularly, based on the second determined bandwidth assignment rate of bandwidth assignment rate determining unit 107C ' upwards, determine the frequency band state that makes progress of Wireless IP network 10B.

In this case, as first upwards the situation of bandwidth assignment rate determining unit 107A ', second upwards bandwidth assignment rate determining unit 107C ' based on the transmission band control messages (the second downward control information transmission) of the Wireless IP network 10B that for example receives from MN300, by Wireless IP network 10B actual reception the IP grouping receiving velocity or be sent to the transmission band control messages (first make progress control information transmission) of the Wireless IP network 10B of MN300, determine the bandwidth assignment rate of Wireless IP network 10B.

In addition, as first upwards the situation of frequency band status determining unit 107B, for example, second upwards frequency band status determining unit 107D based on the second determined bandwidth assignment rate of bandwidth assignment rate determining unit 107C ' upwards, calculating will be in the second reception amount of deflection regularly of upwards monitoring in the period IP grouping that receives by Wireless IP network 10B, and with the amount of deflection that calculates and with second upwards the corresponding threshold value of the determined bandwidth assignment rate of bandwidth assignment rate determining unit 107C ' compare.Then, determine to be sent to the current upwards quality of transmission band (bandwidth assignment rate) of the IP grouping of Wireless IP network 10B by MN300.In this case,, determine that frequency band is in good condition,, determine that frequency band is in bad condition if amount of deflection is equal to or less than threshold value if amount of deflection surpasses threshold value.

Upwards definite method of frequency band state of

Wireless IP network

10A and 10B is below described.Other configurations are identical with those configurations according to the swap server 100 of the 5th embodiment.

[the functional block configuration of MN300]

Figure 18 is the functional block allocation plan of formation according to the MN300 of the communication system of sixth embodiment of the invention.For this MN300, the configuration of frequency band computing unit 307 ' is different from the configuration according to the frequency band computing unit of the MN300 of the 5th embodiment.In other words, frequency band computing unit 307 ' calculates and receives from required Wireless IP network 10A of the IP grouping of swap server 100 and the frequency band (transmission rate) of 10B, and comprises: the first downward bandwidth assignment rate determining unit 307A ', the first downward frequency band status determining unit 307B, the second downward bandwidth assignment rate determining unit 307C ' and the second downward frequency band status determining unit 307D.The frequency band computing unit 107 ' of the concrete function of frequency band computing unit 307 ' and swap server shown in Figure 17 100 much at one.

In other words, the first downward bandwidth assignment rate determining unit 307A ' determines to be sent to by swap server 100 the bandwidth assignment rate of the IP grouping of Wireless IP network 10A.In addition, the first downward frequency band status determining unit 307B determines the downward frequency band state of Wireless IP network 10A based on the reception timing of the order IP grouping that receives by Wireless IP network 10A, based on the determined bandwidth assignment rate of the first downward bandwidth assignment rate determining unit 307A ' in the first downward monitoring period.

In this case, the first downward bandwidth assignment rate determining unit 307A ' based on the transmission band control messages of the Wireless IP network 10A that for example receives from swap server 100 (first upwards control information transmission), by Wireless IP network 10A actual reception the IP grouping receiving velocity or be sent to the transmission band control messages (the first downward control information transmission) of the Wireless IP network 10A of swap server 100, determine the bandwidth assignment rate of Wireless IP network 10A.

In addition, the first downward frequency band status determining unit 307B is based on the determined bandwidth assignment rate of the first downward bandwidth assignment rate determining unit 307A ', calculating will be in the reception amount of deflection regularly of the first IP grouping that receives by Wireless IP network 10A in the monitoring period downwards, and compares with the amount of deflection that calculates with the corresponding threshold value of the first downward determined bandwidth assignment rate of bandwidth assignment rate determining unit 307A '.Then, determine to be sent to the current upwards quality of transmission band (bandwidth assignment rate) of the IP grouping of Wireless IP network 10A by swap server 100.In this case,, determine that frequency band is in good condition,, determine that frequency band is in bad condition if amount of deflection is equal to or less than threshold value if amount of deflection surpasses threshold value.

Similarly, the second downward bandwidth assignment rate determining unit 307C ' determines to be sent to the bandwidth assignment rate of the IP grouping of Wireless IP network 10B by swap server 100.In addition, the second downward frequency band status determining unit 307D determines the downward frequency band state of Wireless IP network 10B based on the reception timing of the order IP grouping that receives by Wireless IP network 10B, based on the determined bandwidth assignment rate of the second downward bandwidth assignment rate determining unit 307C ' in the second downward monitoring period.

In this case, as the situation of the first downward bandwidth assignment rate determining unit 307A ', the second downward bandwidth assignment rate determining unit 307C ' based on the transmission band control messages of the Wireless IP network 10B that for example receives from swap server 100 (second upwards control information transmission), by Wireless IP network 10B actual reception the IP grouping receiving velocity or be sent to the transmission band control messages (the second downward control information transmission) of the Wireless IP network 10B of swap server 100, determine the bandwidth assignment rate of Wireless IP network 10B.

In addition, as the situation of the first downward frequency band status determining unit 307B, for example, the second downward frequency band status determining unit 307D is based on the determined bandwidth assignment rate of the second downward bandwidth assignment rate determining unit 307C ', calculating will be in the reception amount of deflection regularly of the second IP grouping that receives by Wireless IP network 10B in the monitoring period downwards, and compares with the amount of deflection that calculates with the corresponding threshold value of the second downward determined bandwidth assignment rate of bandwidth assignment rate determining unit 307C '.Then, determine to be sent to the quality of current downward transmission band (bandwidth assignment rate) of the IP grouping of Wireless IP network 10B by swap server 100.In this case,, determine that frequency band is in good condition,, determine that frequency band is in bad condition if amount of deflection is equal to or less than threshold value if amount of deflection surpasses threshold value.

Definite method of the downward frequency band state of above-mentioned

Wireless IP network

10A and 10B is below described.

Then, description is at definite method of the state of frequency band up and down of each network among Wireless IP network 10A and the 10B.Other configurations are identical with those configurations according to the MN300 of the 5th embodiment.

[definite method of frequency band state]

Then, description is at definite method of the state of frequency band up and down of each network among Wireless IP network 10A and the 10B.

In the present embodiment, in each of swap server 100 and MN300, as the situation of the 3rd embodiment, the transmission packets frequency band of wireless communications path is by determining the bandwidth assignment rate of each wireless communications path, regularly determine the frequency band state of wireless communications path based on the reception of the intersegmental sequential packet that receives by the respective wireless communication path when the monitoring that is inversely proportional to determined bandwidth assignment rate, based on determining that the result produces the transmission band control messages that is used for the control transmission frequency band, and with the transmission band control messages be sent to the grouping destination, control.

In addition, herein, in the present embodiment, as the situation of the 5th embodiment, send and receive the IP grouping by the Wireless IP network 10A that is used as main path, then when the frequency band (transmission speed) of main path is not enough, Wireless IP network 10B as from the path, and is used from the frequency band of path compensation deficiency.Therefore, for example identical in mode shown in Figure 19, suppose to receive the VoIP grouping that sends at interval with 20ms, be 25% when main path or from the bandwidth assignment rate in path, so as shown in Figure 9, the packet transmission interval in path is 80ms.When the bandwidth assignment rate was 50%, as shown in figure 10, the packet transmission interval in path was 40ms, and when the bandwidth assignment rate was 100%, as shown in figure 11, the packet transmission interval in path was 20ms.In addition, in the present embodiment, the Tm indication shown in Fig. 9 to 11 is based on the monitoring period of the bandwidth assignment rate of wireless communications path.

In the present embodiment, for example, according to the bandwidth assignment rate, the monitoring period Tm that is inversely proportional to the bandwidth assignment rate is set to 5 transmission packets grouping periods.Then, calculate the reception amount of deflection α regularly of the IP grouping that in monitoring period Tm, receives according to following formula (1).Then, when based on the amount of deflection that calculates with the corresponding threshold alpha th ， α of bandwidth assignment rate that determines for communication path ≦ α th, detect communication path and narrow down.

By this way, when when Fig. 9 midband apportionment ratio is 25%, Tm=400m, when when Figure 10 midband apportionment ratio is 50%, Tm=200ms, when when Figure 11 midband apportionment ratio is 100%, Tm=100ms.In other words, bandwidth assignment rate high more (transfer rate is high more), Tm is short more.Therefore, when if the permission frequency band of the communication path of high frequency band apportionment ratio has narrowed down, can be by detecting narrow-band rapidly, reduce the quantity that is retained in the grouping in the communication path efficiently, and the permission frequency band of communication path that can be by accurately detecting the low-frequency band apportionment ratio narrows down, and reduces the quantity that is retained in the grouping in the communication path efficiently.

For example, in Fig. 9 to 11, suppose that the permission frequency band of wireless communications path has been narrowed 50% behind the moment t1 that receives grouping N1.In bandwidth assignment rate as shown in Figure 9 is under 25% the situation, if the moment t3 at the monitoring period Tm (t2-t3) that receives next grouping N3 (black circles) determines that wireless communications path narrows down, delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms so.Therefore, in this case, reproduction allows the quantity of the grouping that will abandon (with hatched circle) behind the line only to have 2.

In addition, when when Figure 10 midband apportionment ratio is 50%, if after moment t1 receives grouping N1, moment t3 at the monitoring period Tm (t2-t3) that receives next grouping N3 (black circles) determines that wireless communications path narrows down, and delay Ds time of delay that is caused by the grouping that sends till moment t3 is 240ms so.Therefore, in this case, reproduction allows the quantity of the grouping that will abandon (with hatched circle) behind the line only to have 3.

Similarly, when when Figure 11 midband apportionment ratio is 100%, if after moment t1 receives grouping N1, moment t3 at the monitoring period Tm (t2-t3) that receives next grouping N3 (black circles) determines that wireless communications path narrows down, and delay Ds time of delay that is caused by the grouping that sends till moment t3 is 160ms so.Therefore, in this case, reproduction allows the quantity of the grouping that will abandon (with hatched circle) behind the line only to have 2.

In addition, in the present embodiment, for swap server 100, the monitoring period Tm shown in Fig. 9 to 11 is equivalent to first of Wireless IP network 10A and upwards monitors second of period or Wireless IP network 10B and upwards monitor the period.And for MN300, monitoring period Tm is equivalent to the second downward monitoring period that first of Wireless IP network 10A monitors period or Wireless IP network 10B downwards.

By this way, the monitoring period Tm that is inversely proportional to the bandwidth assignment rate is set respectively by the direction up and down for

Wireless IP network

10A and 10B, by calculating the reception amount of deflection α regularly of the IP grouping that in monitoring period Tm, receives, and when being equal to or less than at the amount of deflection α that calculates with the corresponding threshold alpha th of the bandwidth assignment rate of communication path, the permission frequency band of determining communication path narrows down, just can detect the fluctuation that changes the permission frequency band of (as decline) in accordance with communication environments rapidly and accurately, and can be sent to MN300, and be sent to swap server 10 for the transmission band control messages that MN300 will be used to control the transmission band of

Wireless IP network

10A and 10B for the transmission band control messages that swap server 100 will be used to control the transmission band of Wireless IP network 10A and 10B.Therefore, for real-time application (as VoIP), can reduce effectively because the quantity of the grouping of reproducing that will be dropped that postpones the time of advent that allows the frequency band fluctuation to cause to cause by transmission band based on transmission band control messages control wireless communications path.

[operation of communication system]

Then, the communication sequential chart shown in Figure 16 of reference below is described the operation according to the communication system of the 6th embodiment.As the situation of the 5th embodiment, in step S10, swap server 100 and MN300 send and receive the VoIP grouping by Wireless IP network 10A (main path) and the Internet 20.In this step S10, carry out route by 20 pairs of all VoIP groupings of Wireless IP network 10A (main path) and the Internet.

Therefore, in this case, swap server 100 by frequency band computing unit 107 ' first upwards bandwidth assignment rate determining unit 107A ' determine that the upwards bandwidth assignment rate of Wireless IP network 10A is 100%, MN300 determines that by the first downward bandwidth assignment rate determining unit 307A ' of frequency band computing unit 307 ' the downward bandwidth assignment rate of Wireless IP network 10A is 100%.

After this, in step S20A, in MN300, the first downward frequency band status determining unit 307B of frequency band computing unit 307 ' based on the bandwidth assignment rate (in this case, 100%) the first VoIP grouping by Wireless IP network 10A actual reception in the monitoring period Tm (as Tm=100ms) downwards that is inversely proportional to, calculate the reception amount of deflection α regularly of VoIP grouping according to following formula (1), described bandwidth assignment rate is definite by the first downward bandwidth assignment rate determining unit 307A '.In addition, based on the amount of deflection α that calculates and and the corresponding threshold alpha th of the first downward determined bandwidth assignment rate of bandwidth assignment rate determining unit 307A ' between comparison, determine the quality of transmission band of the current downward direction of Wireless IP network 10A.

Similarly, in step S20B, in swap server 100, frequency band computing unit 107A ' first upwards frequency band status determining unit 107B based on the bandwidth assignment rate (in this case, what 100%) be inversely proportional to first upwards monitors in the period Tm (as Tm=100ms) VoIP grouping by Wireless IP network 10A actual reception, calculates the reception amount of deflection α regularly of VoIP grouping according to following formula (1), and upwards bandwidth assignment rate determining unit 107A ' is definite by first for described bandwidth assignment rate.In addition, based on the amount of deflection α that calculates and and the first upwards comparison between the corresponding threshold alpha th of the determined bandwidth assignment rate of bandwidth assignment rate determining unit 107A ', determine the current upwards quality of transmission band of Wireless IP network 10A.

After this, in step S30A, S30B, S40A, S40B, S50A and S50B, carry out the processing identical with the situation of the 5th embodiment.Then, compensate the frequency band of the deficiency of Wireless IP network 10A with Wireless IP network 10B.

After this, for Wireless IP network 10B, swap server 100 by frequency band computing unit 107 ' second upwards bandwidth assignment rate determining unit 107C ' determine the upwards bandwidth assignment rate of Wireless IP network 10B.In addition, second upwards frequency band status determining unit 107D is based on second upwards monitoring in the period Tm VoIP grouping by Wireless IP network 10B actual reception, calculate the reception amount of deflection α regularly of VoIP grouping according to following formula (1) what being inversely proportional to the bandwidth assignment rate, and upwards bandwidth assignment rate determining unit 107C ' is definite by second for described bandwidth assignment rate.In addition, second upwards frequency band status determining unit 107D by the amount of deflection α that relatively calculates and with the second corresponding threshold alpha th of the determined bandwidth assignment rate of bandwidth assignment rate determining unit 107C ' upwards, determine the current upwards quality of transmission band of Wireless IP network 10B, and produce transmission band control messages (second upwards control information transmission), and send it to MN300 based on definite result.

Similarly, for Wireless IP network 10B, MN300 determines the downward bandwidth assignment rate of Wireless IP network 10B by the second downward bandwidth assignment rate determining unit 307C ' of frequency band calculating single 307 '.In addition, the second downward frequency band status determining unit 307D is based in the second VoIP grouping by Wireless IP network 10B actual reception in the monitoring period Tm downwards that is inversely proportional to the bandwidth assignment rate, calculate the reception amount of deflection α regularly of VoIP grouping according to following formula (1), and described bandwidth assignment rate is definite by the second downward bandwidth assignment rate determining unit 307C '.In addition, the second downward frequency band status determining unit 307D based on the amount of deflection α that calculates and and the corresponding threshold alpha th of the second downward determined bandwidth assignment rate of bandwidth assignment rate determining unit 307C ' between comparison, determine the quality of the current downward transmission band of Wireless IP network 10B, and produce transmission band control messages (the second downward control information transmission), and send it to swap server 100 based on definite result.

In addition, for Wireless IP network 10A (main path), swap server 100 by frequency band computing unit 107 ' first upwards bandwidth assignment rate determining unit 107A ' determine the upwards bandwidth assignment rate of Wireless IP network 10A.In addition, first upwards frequency band status determining unit 107B is based on first upwards monitoring in the period Tm VoIP grouping by Wireless IP network 10A actual reception, calculate the reception amount of deflection α regularly of VoIP grouping according to following formula (1) what being inversely proportional to the bandwidth assignment rate, and upwards bandwidth assignment rate determining unit 107A ' is definite by first for described bandwidth assignment rate.In addition, first upwards frequency band status determining unit 107B based on the amount of deflection α that calculates and and the first upwards comparison between the corresponding threshold alpha th of the determined bandwidth assignment rate of bandwidth assignment rate determining unit 107A ', determine the current upwards quality of transmission band of Wireless IP network 10A, and produce transmission band control messages (first upwards control information transmission), and this message is sent to MN300 based on definite result.

Similarly, for Wireless IP network 10A (main path), MN300 determines the downward bandwidth assignment rate of Wireless IP network 10A by the first downward bandwidth assignment rate determining unit 307A ' of frequency band computing unit 307 '.In addition, the first downward frequency band status determining unit 307B is based in the first VoIP grouping by Wireless IP network 10A actual reception in the monitoring period Tm downwards that is inversely proportional to the bandwidth assignment rate, calculate the reception amount of deflection α regularly of VoIP grouping according to following formula (1), and described bandwidth assignment rate is definite by the first downward bandwidth assignment rate determining unit 307A '.In addition, the first downward frequency band status determining unit 307B based on the amount of deflection α that calculates and and the corresponding threshold alpha th of the first downward determined bandwidth assignment rate of bandwidth assignment rate determining unit 307A ' between comparison, determine the quality of the current downward transmission band of Wireless IP network 10A, and produce transmission band control messages (the first downward control information transmission), and this message is sent to swap server 100 based on definite result.

Therefore, swap server 100 distributes the VoIP grouping that receives from IP phone terminal 42 based on the transmission band control messages (the first downward control information transmission) that receives from MN300 to Wireless IP network 10A, and sends the VoIP grouping to it.Then, MN300 distributes the VoIP grouping to Wireless IP network 10B, and sends the VoIP grouping to it based on the transmission band control messages that receives from swap server 100 (first upwards control information transmission).

As mentioned above, swap server 100 according to present embodiment, as according to the situation of the swap server 100 of the 5th embodiment, because VoIP grouping is based on the transmission band control messages (the first downward control information transmission and the second downward control information transmission) that receives from MN300 and distributes to

Wireless IP network

Similarly, MN300 according to present embodiment, as according to the situation of the MN300 of the 5th embodiment, because VoIP grouping is based on the transmission band control messages that receives from swap server 100 (first upwards control information transmission and second upwards control information transmission) and distributes to

Wireless IP network

In addition, because the transmission band control messages is by the direction up and down with respect to

Wireless IP network

10A and 10B the monitoring period Tm that is inversely proportional to the bandwidth assignment rate to be set respectively, and the reception by the IP grouping that relatively in monitoring period Tm, receives regularly amount of deflection α and with the corresponding threshold alpha th of communication path, produce at swap server 100 and MN300, therefore can detect the frequency band fluctuation by communication means in real time, come the control transmission frequency band according to Wireless IP network 10A and 10B.Therefore, for real-time application (as VoIP), can minimize effectively because the quantity of the grouping of reproducing that will be dropped that postpones the time of advent that allows the frequency band fluctuation to cause to cause.

In addition, in the 6th embodiment, as the situation of the 5th embodiment, should be noted in the discussion above that the Wireless IP network that adopts is not limited to Wireless IP network 10A and 10B.Can use more Wireless IP network.In addition, the compensation of not enough transmission band is not limited on two directions up and down.And can be direction up or down.In addition, the wireless communication card 301 of MN300 and 303 can be the radio-cell that is embedded among the MN300.

In addition, in the 6th embodiment, be amount of deflection α with the mean value calculation of the reception timing difference between sequential packet.Yet in this case, amount of deflection α approaches current time more, just becomes crucial more.Therefore, can also by with amount of deflection α from averaging of the mode processing that current time more and more closely improves its weight coefficient, calculate amount of deflection α.In addition, because one or two grouping that receives may depart from desirable the reception regularly far away, therefore can change threshold alpha th far away according to the quantity of the grouping that departs from.That is, threshold alpha th increases with the increase of the number of packet that receives beyond receiving regularly in ideal.By this way, can prevent the flase drop survey.In addition, in this case, for example, can also use the reception grouping that is confirmed as not being in hold mode, obtain minimal gradient, threshold alpha th is set based on the statistic of the time of reception difference between the grouping that receives by computation sequence.In addition, can also based on the minimum value of the time of reception difference between the grouping that receives of order or every one receive grouping or every two receive grouping (or the like) between the minimum value of time of reception difference, threshold alpha th is set.

In addition, as amount of deflection α during less than threshold alpha th, can also be by calculating the bandwidth assignment rate based on difference based on both, and the bandwidth assignment rate that calculates is sent to the grouping transmitter side as the transmission band control messages, or by above-mentioned difference is sent to the grouping transmitter side as the transmission band control messages, in the grouping transmitter side, calculate the bandwidth assignment rate, come the control transmission frequency band based on this difference.

On the other hand, when amount of deflection α surpasses threshold alpha th, can also be by calculating the bandwidth assignment rate that is higher than current bandwidth assignment rate based on difference based on both, and the bandwidth assignment rate that calculates is sent to the grouping transmitter side as the transmission band control messages, or by above-mentioned difference is sent to the grouping transmitter side as the transmission band control messages, in the grouping transmitter side, calculate the bandwidth assignment rate that is higher than current bandwidth assignment rate based on this difference, come the control transmission frequency band, come the control transmission frequency band.

In addition, in the present embodiment, because monitoring period Tm and bandwidth assignment rate are inversely proportional to, therefore need not to calculate in a manner described amount of deflection α, can be by monitoring the number of packet that in monitoring period Tm, receives, and the quantity by will receiving grouping and compare with the quantity (threshold value) of the corresponding upcoming grouping that receives of bandwidth assignment rate of communication path, determine the frequency band state of communication path.In addition, in this case, can also calculate the bandwidth assignment rate by difference based on quantity that receives grouping and threshold value, and it is sent to the grouping transmitter side as the transmission band control messages, perhaps by this difference is sent to the grouping transmitter side as the transmission band control messages, in the grouping transmitter side, calculate the bandwidth assignment rate, come the control transmission frequency band based on this difference.

In addition, should be noted in the discussion above that based on transmission band control messages control transmission frequency band and be not limited to corresponding wireless path.Can also be applied to another wireless path simultaneously, to allow mutual compensation.In addition, if also have another wireless path to use, this wireless path can be used for the compensation amount of narrowing down.For example, for swap server 100, when based on from the transmission band control messages (the second downward control information transmission) of MN300 when having reduced the bandwidth assignment rate of the grouping that will be sent to Wireless IP network 10B, can the control transmission frequency band, the bandwidth assignment rate of the grouping that will be sent to Wireless IP network 10A is increased, with the compensation reduction, or control, thereby can use another wireless path compensation reduction.

Claims

1. one kind is used for the communicator that communicates by wireless communications path, comprising:

2. communicator according to claim 1, wherein, described frequency band condition monitoring unit regularly is provided with described allowed band based on the reception of the grouping that receives in scheduled time slot.

3. communicator according to claim 1 also comprises:

4. communicator according to claim 3, wherein, described transmission band control unit is controlled the encoding rate of the data that will be sent to described Correspondent Node or the transmission of file.

5. one kind is used for the communication means that communicates by wireless communications path, comprising:

6. one kind is used for sending the grouping of a plurality of different pieces of informations and receiving the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprising:

7. one kind is used for sending the grouping of a plurality of different pieces of informations and receiving the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprising:

Monitor the wireless status of described wireless communications path;

8. one kind is used for the communicator that communicates by wireless communications path, comprising:

9. communicator according to claim 8, wherein, the transmission packets period of the predetermined quantity of the order that described frequency band condition monitoring unit will send with described transmission intercal is set to the described monitoring period.

10. communicator according to claim 8, wherein, described frequency band condition monitoring unit calculates the reception amount of deflection regularly of the grouping that will receive by described wireless communications path in the described monitoring period, and based on the described amount of deflection that calculates and and the corresponding threshold value of described transmission intercal between comparison, monitor described frequency band state.

11. communicator according to claim 8 also comprises:

12. communicator according to claim 11, wherein, described transmission band control unit is controlled the encoding rate of the data that will be sent to described Correspondent Node or the transmission of file.

13. one kind is used for the communication means that communicates by wireless communications path, comprises:

14. one kind is used for sending the grouping of a plurality of different pieces of informations and receiving the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprises:

15. one kind is used for sending the grouping of a plurality of different pieces of informations and receiving the communication means of the grouping of a plurality of different pieces of informations from described Correspondent Node to a Correspondent Node by wireless communications path, comprises:

Monitor the wireless status of described wireless communications path;

16. communication control unit, can use and many of radio communication device different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control unit comprises:

17. communication control unit according to claim 16, wherein,

18. communication control unit according to claim 16, wherein

19. radio communication device, can use and many of communication control unit different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described radio communication device comprises:

20. radio communication device according to claim 19, wherein,

21. radio communication device according to claim 19, wherein,

22. communication control method, can use and many of radio communication device different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control method may further comprise the steps:

23. wireless communications method, can use and many of communication control unit different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described wireless communications method may further comprise the steps:

24. communication control unit, can use and many of radio communication device different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control unit comprises:

25. communication control unit according to claim 24, wherein,

26. communication control unit according to claim 24, wherein,

27. radio communication device, can use and many of communication control unit different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described radio communication device comprises:

28. radio communication device according to claim 27, wherein,

29. radio communication device according to claim 27, wherein,

30. communication control method, can use and many of radio communication device different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, control the communication between described radio communication device and the Correspondent Node, described communication control method may further comprise the steps:

31. wireless communications method, can use and many of communication control unit different wireless communications paths, and at the required frequency band of real-time application in using, by compensate the frequency band deficiency of a wireless communications path with another wireless communications path, carry out radio communication by communication control unit and Correspondent Node, described wireless communications method may further comprise the steps: