CN1754400A - Method and system for the wireless transmission of loss sensitive data - Google Patents
Method and system for the wireless transmission of loss sensitive data Download PDFInfo
- Publication number
- CN1754400A CN1754400A CNA008173826A CN00817382A CN1754400A CN 1754400 A CN1754400 A CN 1754400A CN A008173826 A CNA008173826 A CN A008173826A CN 00817382 A CN00817382 A CN 00817382A CN 1754400 A CN1754400 A CN 1754400A
- Authority
- CN
- China
- Prior art keywords
- mobile radio
- radio station
- data
- handover
- buffer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 68
- 230000005540 biological transmission Effects 0.000 title claims abstract description 43
- 230000009467 reduction Effects 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000004044 response Effects 0.000 claims abstract description 14
- 239000000872 buffer Substances 0.000 claims description 51
- 238000004891 communication Methods 0.000 claims description 42
- 230000011664 signaling Effects 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 3
- 230000001934 delay Effects 0.000 claims description 2
- 230000003139 buffering effect Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 13
- 230000001413 cellular effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000003872 anastomosis Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/26—Resource reservation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A method and system for improving the quality of service for data transmission to a mobile station (10). In accordance with one embodiment of the invention, a candidate cell (38(2)) for handoff of the mobile station is identified in response to the detection of a need to perform a handoff. Buffering resources for use in connection with the data transmissions are then allocated (82) in the candidate cell. In accordance with another embodiment, a condition causing a potential reduction in the quality of service to the mobile station is detected, and in response thereto, an existing allocation of buffering resources in the system is increased (56) to compensate for the potential reduction in the quality of service. In accordance with yet another embodiment of the invention, a condition causing a potential reduction in the quality of service to the mobile station is detected. In response thereto, a transmission rate of data to the mobile station is increased (116) to compensate for the potential reduction in the quality of service.
Description
Technical field
The present invention relates generally to the wireless transmission of data, particularly relate to effective processing of loss sensitive data business in the mobile communication system.
Background technology
At first, mobile communication system mainly is for realizing that in wireless environment Speech Communication is designed.Along with the development of radio telecommunications system, additional speech information and messenger service and performance are increased.In addition, Xin Yidai radio telecommunications system just is being designed to handle the data communication service of a more changeableization scope.With mainly be that to be designed to the analog-and digital-cellular protocol of Speech Communication opposite, these business such as GPRS (GPRS) have been considered to launch mass data at a high speed.But this performance makes access internet and make and to utilize wireless terminal reproduction application software and data file to become feasible.
; because interference, multipath transmisstion and other factors, be used to the air interface of between wireless mobile and fixed base stations system, communicating by letter and be connected than the circuit that is used to launch grouped data by the Internet or other communication network usually and suffer more the googol certificate and lose or error code.It is general especially during from a base station to the handover of another one that these are lost in mobile radio station, because handover causes temporary transient an interruption in the connection.As a result, for the mobile radio station that is comprised in the frequent handovers, such as when this mobile radio station with a very fast speed when cell row enters the sub-district, the loss of data and the error rate are tended to increase.
If the relatively small number destination data is lost or sporadic emission mistake occurs, then relevant for Speech Communication, a slight distortion in the emission voice may produce; There is not substantive issue in this type of distortion understanding usually on the voice.On the other hand, about the emission of a batch data, image or software, even the recipient is very responsive to obliterated data and a data byte can not be lost.If one is lost generation, if error code is perhaps arranged during launching, the then this sensitive data of losing must be retransmitted.
For fear of having to from its origination node retransmission data, each intermediate node in data communication network often comprises buffer, and these buffers are temporarily stored packet or its part in a short time at one during the emission process and after this grouping is launched.Therefore, lose or mistake when taking place when one, data are can be near the node retransmitted rather than must always send a re-send request may and get back to origination node., if a large number of data are had to when retransmitted, then buffer may overflow, and forces and retransmit one or more packets from origination node.The effective speed that data is transmitted from such repeating transmission of origination node is slack-off and the overall quality of service that provides to mobile radio station has been provided.
A possible solution of this problem is to increase buffer size simply.This solution has proposed other requirement with regard to processing and memory space aspect to system resource, and this has increased system cost and may cause other delay in emission.
Therefore, need a kind of method and system, it is used for the minimum bit-error rate of reality relevant for the data transmission in the radio telecommunications system and improves service quality.Preferably, this system and method will reduce the needs of avoiding for each different data connection the wireless data network system design being merged big buffer from the number of re-transmission of origination node simultaneously.In addition, a kind of like this method and system will comprise the process or the mechanism of the adverse effect that is used to reduce relevant data communication handover.
Summary of the invention
The present invention includes a kind of method and system relevant that be used for the data transmission of wireless communication system.Especially, this method and system is used to improve the service quality that provides to mobile radio station during the emission of loss sensitive data.When the condition in the cordless communication network makes relevant for a specific data transmission session error rate of a loss of data or an increase may take place the time, then network is redistributed resource so that the launching condition of compensate for poor at least in part.
Relevant for one embodiment of the present of invention, this system detects the imminent needs of the handover of mobile radio station from the serving BS to the target BS during a data transmission of carrying out.In response to the detection for the imminent needs of handover, this system is used for target BS identification a candidate cell of handover as the mobile radio station place.Be used in a signaling node in the Route Selection of the data that are transmitted to mobile radio station and before handover, distribute cache resources in the candidate cell.These resources are allocated for the use relevant with data transmission.In addition, before handover, signaling node begins to launch data and gives target BS.These data can be stored in before handover is finished in the cache resources of distribution then.The storage data are used in handover then and are transmitted to mobile radio station from target BS at once after finishing, thereby are reduced in the possibility that substantial data is lost during the handover procedure, and/or the adverse effect of high bit-error.
Relevant for an alternative embodiment of the present invention, a kind of wireless data communication system comprises a buffer that is used to store the data that will be transmitted to mobile radio station.This buffer has the memory of a configurable number, its be allocated for store about with the data of the data communication of mobile radio station.Detecting when may cause the situation that the service quality to mobile radio station reduces, be used to be allocated for the quantity of the buffer memory of data communication for a signaling node increase of mobile radio station the data route.This increase is used for compensating at least in part the potential reduction of service quality.The potential reduction of such service quality for example can comprise: a detection that exceeds the error rate of a selected threshold value; A detection of the speed that mobile radio station is high relatively; An identification for the needs of mobile radio station handover; Perhaps being stored in data volume in the cache resources of distribution surpasses of selected threshold value and determines.The operation of the system and method for this embodiment helps to avoid needs for from the origination node retransmission data by allowing to be stored in the data transmission network near accelerating of the data in the node of mobile radio station.
According to another one embodiment of the present invention, this data communication system comprises a server, therefrom sends the data that will be transmitted to mobile radio station.This system also is included in a buffer in the wireless network, and it is used to store the data that will be transmitted to mobile radio station.Detecting when may cause condition that the service quality from mobile radio station reduces, a signaling node increase in this wireless network is stored in the emission rate of the data in this wireless network buffer so that compensate reduction potential in the service quality at least in part.Preferably, the emission rate of increase is caused by distribution (such as being used to launch the increase that data are given the number of timeslots of the mobile radio station) institute of transmission resources additional in the wireless network.As a result, data can be eliminated from the wireless network buffer with a faster rate, thereby reduce the possibility that will need emission data from originating server during the cycle of loss of data that increases or high emission mistake.
Description of drawings
For the present invention there being a more complete understanding, carry out following detailed description in conjunction with the accompanying drawings, in the accompanying drawing:
Fig. 1 is the block diagram that is used to set up a categorical data net of RFDC;
Fig. 2 is the curve chart that illustrates the illustrated example of the service quality of mobile radio station;
Fig. 3 shows and can close a global positioning satellite system of use with a mobile cellular anastomose;
Fig. 4 has described the part of the Cellular Networks of a highway by wherein;
Fig. 5 has illustrated the data communication service method for quality flow chart that utilizes dynamic buffering device branch to be used in the improvement mobile radio station according to one embodiment of present invention;
Fig. 6 show according to a different embodiment by morning handover start the data communication service method for quality flow chart that is used to improve mobile radio station;
Fig. 7 has illustrated that alternative embodiment utilization handover morning starts the data communication service method for quality flow chart that is used to improve mobile radio station according to the present invention;
Fig. 8 show according to the present invention the utilization of another one alternative embodiment early handover start the data communication service method for quality flow chart that is used to improve mobile radio station;
Fig. 9 has illustrated the method flow diagram that is used for the signal quality of improving data communication service according to a different embodiment by the emission rate that is increased to mobile radio station; With
Figure 10 has described the method flow diagram that is used for the signal quality of improving data communication service according to a different embodiment relevant for handover by the emission rate that is increased to mobile radio station.
Preferred forms
Now accompanying drawing is carried out reference, wherein, at each figure everywhere, similar reference number is represented similar or similar part.Referring now to Fig. 1,, shows the block diagram of a categorical data net that is used to set up RFDC.For illustrative purposes, as shown in the figure and the data network that is discussed below be GPRS (GPRS) system 2.GPRS is a Wireless Data Protocol that is used in combination with GSM standard., it will be understood by those skilled in the art that the present invention can also be used in combination with the packet switching network of other type and with Circuit Switching Network.
The data type of being handled by data network 2 can change and for example can comprise widely: data structure, image and/or software.Compare with Speech Communication, most of these data communication data are lost or error code responsive especially.In fact, relevant for the emission of loss sensitive data, if having any loss of data or error code normally unacceptable.Therefore, need allow mechanism in position so that allow error correction and by the repeating transmission of obliterated data.Such mechanism is particular importance in the RFDC environment, because be used to mistake during the air interface of wireless transmission is tended to be launched especially easily or the influence of losing.
When data were moved station 10 from application server 12 request, the data of application server 12 these requests of retrieval also sent to a data grouping that comprises data or comprise its part by a Packet Based Network such as the Internet 16 mobile radio station 10 of request.Usually, Packet Based Network 16 comprises a plurality of routing nodes 14.According to final purpose way address (that is, mobile radio station 10), each routing nodes 14 receives the packet of launching and passes through next jumping it is retransmitted to another one routing nodes 14.
At last, packet arrives a Serving GPRS Support Node (SGSN) 18, and it serves mobile radio station 10 residing zones.SGSN 18 is the packet reformatting that is used for launching at gprs system.This reformatting for example can comprise packet is converted to the GPRS agreement from ICP/IP protocol.In case packet is by reformatting, then SGSN 18 is transmitted to packet a serving BS (BS) 20 of mobile radio station 10.Base station 20 then sends to mobile radio station 10 to packet by an air interface 22.
In order to help data transmission, SGSN 18 comprises and is used for the buffer memory (M) 24 that temporary transient storage will be transmitted to the packet of mobile radio station 10.Similarly, base station 20 also comprises and is used for the buffer memory (M) 26 that temporary transient storage will be transmitted to the packet of mobile radio station 10.In the situation that the emission mistake occurs, data of being lost or comprise the packet (being detected by a suitable error detection protocols) of error code after mobile radio station 10 receives can be retransmitted to mobile radio station 10 from one of buffer memory 24 or 26.Avoided being beyond the control of from application server 12, not asking and carrying out and retransmit caused delay from this ability that a local relatively node is retransmitted the storage data.
In case data are moved station 10 and successfully receive, acknowledge message can be sent to base station 20 and SGSN 18 first, is used to provide the notice that succeeds in sending up first.Therefore data in the buffer memory 24 and 26 can be deleted, thereby be used for emission to mobile radio station 10 for receive other packet Free up Memory from Packet Based Network 16.
, if relatively lot of data is lost or frequent error code takes place, then divide the buffer amount of space that is used in the data communication of mobile radio station 10 to overflow.In other words, the packet that be transmitted to mobile radio station 10 can be received than data just deleted faster rate from buffer memory 24 or 26 with one by SGSN 18 and/or base station 20.Such incident causes that some data are lost, because there are not enough buffer spaces to store all data.Data lose need be from application server 12 retransmission data, thereby owing to the slack-off service quality that has reduced mobile radio station 10 of speed that data are transmitted.
The one of the main reasons of loss of data or mistake is the handover of mobile radio station 10 from a base station 20 to another one in the emission.When mobile radio station 10 moved to cell edge by Current Serving BTS 20 service, the signal strength signal intensity of the signal that is received by mobile radio station 10 was tended to reduce.In a typical cellular system, mobile radio station 10 periodic measurements neutralize from the signal strength signal intensity in the base station in the neighbor cell 20 from serving BS.Mobile radio station 10 is transmitted to serving BS 20 to this information so that can make about when needing to be handed over to a judgement of another one base station 20.In case the signal strength signal intensity from serving BS 20 drops under the predetermined threshold, then wireless network thinks that a handover should be performed.Based in neighbor cell from the measured intensity of the signal in the base station 20, a wireless network Target cell of identification also starts the handover (shown in 28) of the target BS 20 ' of mobile radio station 10 from serving BS 20 to Target cell.
In case handover is finished, then by mobile radio station 10 with become air interface 22 ' between the target BS 20 ' of new serving BS 20 ' and set up and the communicating by letter of mobile radio station 10.The data that are transmitted to mobile radio station 10 are sent to new serving BS 20 ' so that it can be transmitted to mobile radio station 10 by SGSN 18 then., during handover, temporarily interrupted with communicating by letter of mobile radio station 10.This interruption will often cause some data to be lost, thereby need to retransmit these data of losing.In some cases, the losing even can cause that buffer memory 24 or 26 overflows of data, this need retransmit from application server 12.
When the speed of mobile radio station 10 increased, mobile radio station 10 was advanced more quickly by the sub-district in the wireless network, causes handover more frequent between the sub-district.When the frequency of handover increased, the problem of obliterated data and error code was tended to multiplication, had also reduced the effective speed that data transmit.In addition, frequent handover may propose more requirements to network processes resource (for example, logical process and storage), and this also may influence data transfer rate.
In addition, because the data transmission to mobile radio station 10 is impossible under some radio condition, the reduction of data transfer rate may take place.When mobile radio station 10 can not receive data, the data in the buffer 24 and 26 increased and overflow and may take place.For example, when mobile radio station 10 during near the serving BS 20 in the sub-district, the signal quality and the signal strength signal intensity of the signal that is received by mobile radio station 10 are very high usually.This high signal quality causes relative low loss of data and a low error rate with signal strength signal intensity., when the distance between serving BS 20 and the mobile radio station 10 increased, received signal quality and received signal intensity were tended to worsen, and this causes that on the data bulk of being lost one increases and/or an increase of the error rate.
Referring now to Fig. 2,, a curve chart has been described, show an illustrated example of the ratio of the service quality that offers mobile radio station 10 and mobile radio station 10 20 the degree of approach to the base station.When mobile radio station 10 during very near base station 20, the service quality that is provided (shown in line 40) is tended at its maximum place or near its maximum (shown in 42).On the other hand, when mobile radio station 10 during near the edge of the overlay area of a specific cell, the service quality 40 that is provided is lowered (shown in 44) in fact.When service quality 40 worsens, correspondingly increase with the error rate of communicating by letter (BER) 46 of mobile radio station 10.Ideally, network operator can be in network executive program or mechanism come to provide more stable effective service quality 40 with convenient mobile radio station 10 during near the edge of Serving cell or the reduction error rate and/or loss of data when mobile radio station 10 relates to a handover to mobile radio station.
According to the present invention, several diverse ways and system are arranged here, they can be used for improveing the service quality that provides to mobile radio station 10 in the wireless data network.In first embodiment, when the loss of data of needs compensation essence or high bit-error, in wireless data communication system, be used to store the buffer 24 of packet and 26 size can dynamically be increased.The current GPRS system has the static cache device; In case buffer reaches load capacity, then buffer begins to overflow, and causes loss of data., meet storage/emission needs, can reduce the needs of retransmission data from application server 12 basically by dynamically increasing buffer size.
According to a different embodiment, before a handover was finished, data were forwarded to a target BS 20 '.Existing wireless data communication system uses a kind of notion of demand load capacity usually.Therefore, the resource in the Target cell be not allocated in data communication up to mobile radio station 10 in fact with (that is, when handover is finished basically) till target BS 20 ' is communicated by letter.If data are lost during handover, then those data must be retransmitted.On the other hand, by gave target BS 20 ' data forwarding before handover, data can be used for the emission to mobile radio station 10 at once after handover is finished, thus the service quality that improvement provides to mobile radio station 10.In order to help the early stage forwarding of data, handover procedure can also start earlier so that further reduce the possibility that remarkable quantity data is lost.
In another embodiment of the present invention, by the handover of predicting needs based on the translational speed and the direction of the mobile radio station 10 that calculates, the handover of mobile radio station 10 can be activated earlier and more effectively.When mobile radio station 10 was advanced by data network 2, network 2 monitored the position of mobile radio station 10.Based on the change of detected mobile station location along with the time, speed of advancing and direction can be calculated.Use is relevant for the velocity vector information of a known honeycomb network topology, and one of handover is similar to constantly and Target cell energy so predicted.Use these predictions, handover can be activated and be done more quickly earlier, thereby reduces the possibility that mass data is lost.
According to a different embodiment, the data transmission rate to mobile radio station 10 can be increased so that compensate loss of data or high bit-error actual or expection.In a typical gprs system, a user consults some other service of level.For example, according to what of user's voluntary payment, the user just may be in about 14 kilobits/second (kbs) (this is equivalent to, and emission distributes a time slot to data) and approximately reception between the 115kbs (this is equivalent to distribute eight time slots).Service class determines will be assigned at any time user's maximum number of time slot then.Except preventing that the time slot in the Target cell is assigned with when mobile radio station 10 still operates in the another one sub-district, this restriction also prevent mobile radio station 10 can with the speed of having consulted than the user faster a speed receive data.Yet, give mobile radio station by distributing other time slot, when the error rate when being high, buffer can be emptied hurry up, and the needs of retransmitting can be avoided.
Referring now to Fig. 3,, a HA Global Positioning Satellite (GPS) system 4 has been described, it can combine with mobile cellular network 2 and be used for monitoring the position of mobile radio station 10.Gps system 4 comprises that emission constantly comprises a plurality of position location satellites 30 of the signal (shown in 31) of satellite position and time reference data.Being attached in the mobile radio station 10 is a GPS receiver 32, and it is designed to receive the signal by position location satellite 30 emissions.Use is included in from the data in the three or more different position location satellites 30, and GPS receiver 32 can be determined current location, velocity vector and a time reference of mobile radio station 10 according to the known treatment method.This information can be displayed on mobile radio station 10 places and can be forwarded to a serving BS 20 so that cellular network 2 can monitor position, speed and the direction that mobile radio station is advanced by air interface 22.
Referring now to Fig. 4,, illustrated that highway 34 passes through the part of Cellular Networks 2 wherein.When a mobile radio station 10 when highway 34 is advanced with a high relatively speed, it moves to next sub-district with a speed that is directly proportional with its speed from a sub-district 38.As a result, handover must be than being performed more continually under mobile or fixed mobile radio station 10 situations at a slow speed.Particularly under the situation of data transmission, these frequent handovers may reduce the service quality to mobile radio station 10 in fact.In addition, under the situation of high-speed mobile radio station 10, compare, a less time window of carrying out handover is arranged with the mobile radio station 10 that moves more slowly.
As discussing, be included in a GPS receiver 32 in the mobile radio station 10 and can be used for advanced positions, speed and direction to Cellular Networks 2 notice mobile radio stations 10 relevant for Fig. 3.Alternately, other program that is used for locating mobile stations 10 can be used.For example, use the signal propagation delays of a measurement between mobile radio station 10 and a plurality of base station 20, the position of mobile radio station can be carried out triangulation.When mobile radio station 10 was advanced with the direction of arrow 33 expressions, it was near the Serving cell 38 (1) of being served by serving BS 20 with by the honeycomb border 36 between the neighbor cell 38 (2) of target BS 20 ' service.Operating speed vector information, network 2 can be predicted the approximate moment that needs handover.In addition, network 2 tabulation that can reduce the candidate cell 38 of handover makes and to predict which or which sub-district 38 optimum handovers that are used for based on detected direct of travel 33.This makes network 2 begin handover procedure (that is, before mobile radio station 10 arrives cell boarder 36) earlier and more effectively implements handover, thereby has reduced the possibility or the degree of loss of data during handover.
Referring now to Fig. 5,, flow process Figure 50 of a kind of method of the data communication service quality of utilizing the dynamic buffering branch to be used in according to one embodiment of present invention to be improved to mobile radio station 10 has been described.In step 52, a data emission is activated, and wherein, loss sensitive data is reproduced from application server 12 and is sent to mobile radio station 10 by a GPRS network 2.During data transmission, network is used for detecting mobile radio station 10 in step 54 by making of a gps system 4 or other navigation system and is just advancing at a high speed with one.For fear of may since the high-speed caused service quality of mobile radio station 10 in a potential reduction (for example, by an increase in the loss of data or the error rate), in step 56, the buffer amount of space of distributing to mobile radio station 10 in the buffer memory 24 and 26 of SGSN 18 and base station 20 is increased.This increase in the buffer space helps prevent buffer to overflow and if necessary, permission is from a local relatively node rather than carry out data re-transmitting from far-end application server 12.
Subsequently, in step 58, whether the speed of mobile radio station 10 is monitored so that determine it and reduces.Still in step 58, whether data transmission is monitored so that determine it and finishes.If any one of these conditions is not satisfied, the buffer space that then is assigned with keeps identical and monitoring continues., if if the speed of mobile radio station 10 reduces or data transmission is finished, then in step 60, the buffer amount of space of distributing to mobile radio station 10 is lowered gets back to normal level.Though be expressed and be described relevant for a high-speed mobile radio station 10 in method illustrated in fig. 5, also can realize this process relevant for other situation that the service quality that relates to mobile radio station 10 reduces.For example, the increase of buffer space can also be used in the situation that detects high bit-error, determines in this system 2 or mobile radio station 10 whether a handover needs, and determines perhaps when buffer begins near load capacity.Distribute the quantity that reduces loss of data by increasing buffer, then need less repeating transmission and service quality modified.
Referring now to Fig. 6,, the flow process Figure 70 of a kind of method that begins to be improved to the data communication service quality of mobile radio station 10 by handover early has been described according to a different embodiment.In step 72, a data emission is activated, and wherein, loss sensitive data is reproduced from application server 12 and is sent to mobile radio station 10 by a GPRS network 2.During launching, network 2 detects mobile radio station 10 in step 74 and is just advancing at a high speed with one.As a result, in step 76, the signal threshold value of handover is increased, and causes to begin handover earlier.Especially, when mobile radio station 10 was shifted to the edge of Serving cell, signal strength signal intensity began to reduce.In case when signal strength signal intensity dropped under the signal threshold value, mobile radio station 10 and/or cellular network began to search for the candidate cell that is used for handover., because the signal threshold value of high-speed mobile radio station 10 is increased, then this handoff procedures begins than beginning earlier in the standard handover scheme.
In step 78, network 2 detects an imminent handover (that is, detected signal strength signal intensity drop under the signal threshold value).Next, in step 80, the one or more candidate cells of network 2 identifications are used for the handover of mobile radio station 10.Preferably, network 2 uses the velocity vector of mobile radio station 10 to predict which or which sub-district is to be used for the most probable sub-district of handover and to use these to predict the tabulation that reduces candidate cell.In case the candidate cell of single or smallest number is identified, then network 2 is distributed in resource in this candidate cell or the cell set in step 82.Preferably, this resource allocation is included in the distribution in a buffer space in the candidate cell.These permission data were passed on before handover and are stored in the candidate cell, so that data transmission can be recovered immediately after handover is finished.By longer handoff notification is provided, resource requirement can be propagated along with the time, and the danger of lost-call is reduced during handover, and had only the danger of a lower obliterated data during the handover between the sub-district.In addition, if data are lost during handover, then use data cached can the processing by the repeating transmission of obliterated data by candidate cell.This causes by a repeating transmission faster of obliterated data.At some some place, carry out handover after the resource allocation in candidate cell in step 84.
Referring now to Fig. 7,, illustrated that according to the present invention alternate embodiment utilization handover early begins to improve flow process Figure 90 of a kind of method of the data communication service quality of mobile radio station 10.In step 72, a data emission is activated.Next, network 2 is in the step 92 prediction approximate time of staying of mobile radio station 10 in Serving cell.The time of staying can use the velocity vector of a detected mobile radio station 10 to be estimated together with the known cellular topology structure of cellular system 2.Alternately, based on the time of staying recently in mobile radio station 10 sub-district formerly, the time of staying can be predicted.In any situation, the use of a prediction time of staying mainly can be used during road running, and at this, speed is direction constant relatively and that can predict to advance with a high relatively accuracy.
Use the time of staying of this prediction, in step 78, an imminent handover is identified.Subsequently, this process continues according to step 80-84, as relevant for shown in Fig. 6 and discuss.For example, if this network decision mobile radio station 10 time of staying in Serving cell is 20 seconds, then this network can distribute the buffer space in the candidate cell and Already in begin to store there data after ten seconds in the Serving cell at mobile radio station 10.
Referring now to Fig. 8,, illustrated and utilized handover early to begin to improve flow process Figure 100 of a kind of method of the data communication service quality of mobile radio station 10 according to a different embodiment.In step 72, a data emission is activated.Then, in step 102, network 2 detects the signal quality of a reduction of signal between serving BS 20 and mobile radio station 10.As illustrated in fig. 2, the signal quality of such reduction often is caused by the mobile radio station of removing in the base station from Serving cell 20 10.In response to the signal quality of this detected reduction, network 2 is at candidate cell that is used for handover of step 80 identification, distributes the resource in the candidate cell and carries out handover in step 84 in step 82, as the same in Fig. 6 and the method shown in 7.
Referring now to Fig. 9,, the flow process Figure 110 that is used for a kind of method of improving data communication service quality according to a different embodiment by the emission rate that is increased to mobile radio station 10 has been described.In step 112, the data transmission of mobile radio station 10 is activated.As mentioned above, depend on the business-level that the user consults, a kind of like this data transmission generally includes a pre-maximum number of time slot of determining.This maximum number of time slot has limited the speed that data can be transmitted to mobile radio station 10., according to the present invention, network 2 detects a high bit-error with mobile station communicate in step 114.In response, network 2 temporarily increases the emission rate of communicating by letter with mobile radio station 10 in step 116 by dividing pairing mobile radio station 10 other time slots (supposing that they are available in Serving cell).The emission rate of this increase has prevented the remarkable decline of the service quality of mobile radio station 10 effectively.Though Fig. 9 has described the increase emission rate relevant for a high bit-error, this program can also be used to improve the service quality in other situation.For example, when buffer memory begins near load capacity, thereby emission rate also can be increased with a faster rate empty data from buffer.
Referring now to Figure 10,, the flow process Figure 120 that comes a kind of method of improving data communication service quality according to a different embodiment relevant for a handover by the emission rate that is increased to mobile radio station 10 has been described.In step 112, a data emission is activated.Subsequently, in step 78, network 2 determines handover coming (for example, according to relevant for Fig. 6-8 program of being discussed).Network 2 is then at candidate cell that is used for handover of step 80 identification, distributes the resource in the candidate cell and carries out handover in step 84 in step 82.
By distributing the buffer space in the candidate cell and storing data (in step 82) there, after handover was finished, mass data can be stored in the candidate cell.Therefore, in step 116, the emission rate in the candidate cell is temporarily increased, so can remove the storage data at least in part from buffer.In case buffer is eliminated, then be returned normally in step 118 emission rate.In case for example buffer has been cleared and has been lower than a selected threshold value or after the grouping of a certain quantity data was launched, then this reduction in the emission rate can take place in new sub-district.
As shown in figure 10, Zao handover procedure can be united to make and is used for improving service quality with the increase in the emission rate.Similarly, the dynamic buffering process also can be used in combination with handover procedure early and/or the increase in the emission rate and improve service quality.
Though illustrated in the accompanying drawings and detailed description in front in the preferred embodiment of method and apparatus of the present invention has been described, but it is self-evident, the present invention is not limited to the disclosed embodiments, but under the condition that departs from the spirit of the present invention of illustrating and defining by claims, a lot of rearranging, revise and substitute can be arranged.
Claims (42)
1. one kind is used to improve the method for loss sensitive data to the emission service quality of mobile radio station, comprises the steps:
Detect the imminent needs of the mobile radio station of reception data transmission for handover;
In response to the detection of described imminent needs for handover, discern a candidate cell of the handover of described mobile radio station; With
Distributed the buffer resource relevant with described candidate cell before handover, described resource is used for described data transmission.
2. the method for claim 1 also comprises the steps: the data that will be transmitted to mobile radio station are sent to described candidate cell, and described data are sent to described candidate cell before handover.
3. method as claimed in claim 2 also comprises the steps: being transmitted to the storage of mobile radio station in described candidate cell.
4. method as claimed in claim 3 also comprises the steps:
Carry out the handover of mobile radio station to described candidate cell; With
In described candidate cell, give described mobile radio station described storage data transmission.
5. method as claimed in claim 4 comprises the steps: that also after carrying out handover increase is transmitted to the emission rate of the data of described mobile radio station.
6. the method for claim 1 also comprises the steps: to monitor the speed of described mobile radio station, and wherein, described detection comprises the approximate moment of predicting handover according to the speed of described supervision for the step of the imminent needs of handover.
7. method as claimed in claim 6 also comprises the steps: a speed that is monitored in response to mobile radio station, promotes a signal threshold value that is used to begin handover.
8. method as claimed in claim 6, wherein, the prediction in the approximate moment of described handover comprises: predict the approximate time of staying of described mobile radio station in a Serving cell.
9. the method for claim 1, wherein described detection comprises for the step of the imminent needs of handover: the signal quality of a reduction of detection and described mobile station communicate.
10. the method for claim 1 comprises the steps: also to monitor that a velocity vector of described mobile radio station, described velocity vector are used to reduce the tabulation of potential candidate cell of the handover of described mobile radio station.
11. one kind is used for improveing in the method for wireless data communication system for the mobile radio station service quality that receives data transmission, comprises the steps:
Detection causes a condition to a potential reduction in the mobile radio station service quality;
In response to the condition of this detection, dynamically increase the quantity allotted of cache resources in the wireless data communication system, the described branch that is used for data transmission that dynamically increases is used in the described potential reduction that compensates service quality at least in part.
12. method as claimed in claim 11, wherein, the described step that detects described condition comprises that detection exceeds an error rate of the selected threshold value error rate.
13. method as claimed in claim 11, wherein, the described step that detects described condition comprises the speed that detects described mobile radio station, and described speed exceeds a selected threshold value speed.
14. method as claimed in claim 11, wherein, the described step that detects described condition comprises needs discerning described mobile radio station handover.
15. method as claimed in claim 11, wherein, the described step that detects described condition comprises: the data bulk of determining to be stored in the cache resources of quantity allotted surpasses a selected threshold value quantity data.
16. method as claimed in claim 11 also comprises the step of the storage that will be transmitted to described mobile radio station in the cache resources that described increase distributes.
17. method as claimed in claim 16 also comprises the steps:
Launch the data in the cache resources that is stored in described increase distribution;
Detection is launched the error rate of data, and the described error rate has surpassed a selected threshold value error rate; With
In response to the error rate of described detection, retransmit the data in the cache resources that is stored in described increase distribution.
18. method as claimed in claim 16 also comprises the steps:
Launch the data in the cache resources that is stored in described increase distribution;
Detecting described of being launched data loses; With
In response to the loss of data of described detection, retransmit the data in the cache resources that is stored in described increase distribution.
19. one kind is used for improveing in the method for wireless data communication system to the mobile radio station service quality of reception data transmission, comprises the steps:
Detection causes a condition to a potential reduction of mobile radio station service quality; With
In response to the condition of described detection, increase data transmission rate to mobile radio station, the emission rate of described increase is used for compensating at least in part reduction potential in the described service quality.
20. method as claimed in claim 19, wherein, the described step that increases emission rate comprises: distribute other transmission resources to be used for data transmission in wireless data communication system.
21. comprising, method as claimed in claim 20, wherein said other transmission resources be used to launch at least one other time slot that data are given mobile radio station.
22. method as claimed in claim 19, wherein, the described step that detects described condition comprises that detection exceeds an error rate of the selected threshold value error rate.
23. method as claimed in claim 19, wherein, the described step that detects described condition comprises needs discerning described mobile radio station handover.
24. method as claimed in claim 19, wherein, the described step that detects described condition comprises: the data bulk of determining to be stored in the cache resources of quantity allotted surpasses a selected threshold value quantity data.
25. a wireless data communication system comprises:
The emission data are given a serving BS of a mobile radio station; With
A selected candidate's as described mobile radio station handover a target BS; With
A signaling node is used for the data that route is launched and gives mobile radio station, is handed over to the result of described target BS as a prediction mobile radio station, and described signaling node was given described target BS the data route that will be transmitted to mobile radio station before handover.
26. system as claimed in claim 25 wherein, discerns described predicted handover according to a detected speed of mobile radio station.
27. system as claimed in claim 26 wherein detects the speed of described mobile radio station by a global positioning satellite system receiver relevant with described mobile radio station.
28. system as claimed in claim 26 wherein uses the signal propagation delays of a measurement between described mobile radio station and a plurality of base station to detect the speed of described mobile radio station.
29. system as claimed in claim 25 wherein, comes the select target base station according to a detected direct of travel of described mobile radio station.
30. system as claimed in claim 25 comprises that also be used to relevant with target BS store a buffer of the data that will be transmitted to mobile radio station.
31. system as claimed in claim 25, wherein, described wireless data communication system comprises a Circuit Switching Network.
32. system as claimed in claim 25, wherein, described wireless data communication system comprises a packet switching network.
33. system as claimed in claim 32, wherein, the described packet switching network comprises a GPRS (GPRS) system.
34. system as claimed in claim 33, wherein, described signaling node comprises a Serving GPRS Support Node.
35. a wireless data communication system comprises:
A kind of buffer that is used to store the data that will be transmitted to mobile radio station, described buffer has the memory of a configurable number, be allocated for store about with the data of the data communication of described mobile radio station; With
A signaling node is used for the data that route will be transmitted to mobile radio station, and in response to a potential reduction in the service quality that detects described mobile radio station, described signaling node dynamically increases the amount of memory that is allocated for data communication.
36. system as claimed in claim 35, wherein, described buffer is relevant with a base station, and described base station is used for giving described mobile radio station data transmission by air interface.
37. system as claimed in claim 35, wherein, described buffer is relevant with described signaling node.
38. system as claimed in claim 35, wherein, described signaling node comprises a service universal grouping wireless business supporting node.
39. system as claimed in claim 35, wherein, described signaling node comprises a base station that is used for by air interface data transmission being given described mobile radio station.
40. a data communication system comprises:
A transmission will be transmitted to the server of the data of mobile radio station, and described data will be launched by a wireless network;
A wireless network buffer is used to store the data that will be transmitted to mobile radio station; With
A radio network signaling node, be used for the data that route will be transmitted to mobile radio station, in response to detecting a potential reduction in the service quality of described mobile radio station, described signaling node increase is stored in the emission rate of the data in the described wireless network buffer.
41. system as claimed in claim 40, wherein, described wireless network buffer be used for giving a base station of described mobile radio station relevant to data transmission by air interface.
42. system as claimed in claim 40, wherein, described signaling node is launched the emission rate that the data that will be launched increase data by distributing other time slot to be used to.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42031199A | 1999-10-18 | 1999-10-18 | |
| PCT/SE2000/001906 WO2001030090A2 (en) | 1999-10-18 | 2000-10-03 | Method and system for the wireless transmission of loss sensitive data |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1754400A true CN1754400A (en) | 2006-03-29 |
Family
ID=23665955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA008173826A Pending CN1754400A (en) | 1999-10-18 | 2000-10-03 | Method and system for the wireless transmission of loss sensitive data |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1224829A2 (en) |
| CN (1) | CN1754400A (en) |
| AR (1) | AR030031A1 (en) |
| AU (1) | AU1065601A (en) |
| WO (1) | WO2001030090A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101163337B (en) * | 2006-10-09 | 2011-07-20 | 阿尔卡特朗讯公司 | A method of triggering a handover of a mobile station in a discontinuous coverage network |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10052716C2 (en) * | 2000-10-24 | 2002-12-05 | Siemens Ag | Method for operating a mobile radio communication system, terminal and radio access point for a mobile radio communication system |
| FI118400B (en) | 2001-08-21 | 2007-10-31 | Nokia Corp | Filter structure comprising piezoelectric resonators |
| US7075886B2 (en) | 2001-12-21 | 2006-07-11 | Itt Manufacturing Enterprises, Inc. | Method and apparatus for routing information in satellite communication networks |
| FI116816B (en) | 2002-10-14 | 2006-02-28 | Nokia Corp | Streaming media |
| US20040081119A1 (en) * | 2002-10-28 | 2004-04-29 | Zhun Zhong | Reducing packet drop in IEEE 802.11 handoff by packet forwarding using driver image queue |
| GB2399989B (en) * | 2003-03-28 | 2005-09-07 | Motorola Inc | Packet control in cellular communications |
| US7710922B2 (en) * | 2004-12-30 | 2010-05-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Flow control at cell change for high-speed downlink packet access |
| US20060227745A1 (en) | 2005-03-11 | 2006-10-12 | Interdigital Technology Corporation | Method and system for station location based neighbor determination and handover probability estimation |
| WO2007074514A1 (en) | 2005-12-27 | 2007-07-05 | Fujitsu Limited | Handover control method |
| EP2119288B1 (en) | 2007-02-08 | 2016-09-14 | Telefonaktiebolaget LM Ericsson (publ) | Reducing buffer overflow |
| GB2533942A (en) * | 2015-01-07 | 2016-07-13 | Vodafone Ip Licensing Ltd | Adaptive buffering of a content player for a mobile device in a telecommunication network |
| CN112703766B (en) * | 2018-08-09 | 2023-07-14 | 中兴通讯股份有限公司 | Method performed by a wireless communication node, wireless communication node |
| US11706674B2 (en) * | 2019-09-29 | 2023-07-18 | Apple Inc. | Pre-forwarding data packets for conditional handover |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2225196A (en) * | 1988-11-16 | 1990-05-23 | Philips Electronic Associated | Cellular radio system |
| CA2221948A1 (en) * | 1996-12-30 | 1998-06-30 | Lucent Technologies Inc. | System and method for achieving handover in wireless lan by buffering data at subsequent access point |
| FI109503B (en) * | 1997-04-15 | 2002-08-15 | Nokia Corp | Prevention of packet loss during handover in a packet-based telecommunications network and handover procedure |
| CA2244366A1 (en) * | 1997-09-22 | 1999-03-22 | Northern Telecom Limited | Velocity assisted handoff system and method for cellular mobile radio systems |
| US6052598A (en) * | 1997-09-30 | 2000-04-18 | At&T Corp | Method for predicting the location of a mobile station in a mobile communications network |
| DE19814440C2 (en) * | 1998-03-31 | 2003-10-02 | Siemens Ag | Decentralized handover of mobile devices |
| US6112323A (en) * | 1998-06-29 | 2000-08-29 | Microsoft Corporation | Method and computer program product for efficiently and reliably sending small data messages from a sending system to a large number of receiving systems |
| AU1435300A (en) * | 1998-11-06 | 2000-05-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Use of mobile station positioning for hand-off |
| DE19900436B4 (en) * | 1999-01-08 | 2016-12-01 | Ipcom Gmbh & Co. Kg | Handover method, mobile station for handover and base station for handover |
-
2000
- 2000-10-03 AU AU10656/01A patent/AU1065601A/en not_active Abandoned
- 2000-10-03 CN CNA008173826A patent/CN1754400A/en active Pending
- 2000-10-03 EP EP00971916A patent/EP1224829A2/en not_active Withdrawn
- 2000-10-03 WO PCT/SE2000/001906 patent/WO2001030090A2/en not_active Application Discontinuation
- 2000-10-12 AR ARP000105377A patent/AR030031A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101163337B (en) * | 2006-10-09 | 2011-07-20 | 阿尔卡特朗讯公司 | A method of triggering a handover of a mobile station in a discontinuous coverage network |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1065601A (en) | 2001-04-30 |
| WO2001030090A2 (en) | 2001-04-26 |
| EP1224829A2 (en) | 2002-07-24 |
| AR030031A1 (en) | 2003-08-13 |
| WO2001030090A3 (en) | 2001-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7633880B2 (en) | Access network device for managing queue corresponding to real time multimedia traffic characteristics and method thereof | |
| KR101171724B1 (en) | Method and apparatus for providing streaming information to a wireless mobile wireless device | |
| US20020181437A1 (en) | Data link transmission control methods, mobile communication systems, data link transmission control apparatus, base stations, mobile stations, mobile station control programs, and computer-readable recording media | |
| KR100982688B1 (en) | Apparatus and method for buffering packets in a multi-hop relay system supporting hop-by-hop retransmission | |
| US7065362B2 (en) | Method for performing a handoff in a mobile communication system | |
| CN1754400A (en) | Method and system for the wireless transmission of loss sensitive data | |
| RU2475980C2 (en) | Basic station, mobile station, communication system and method of reordering | |
| EP1080593B1 (en) | Method for improving communication coverage in multi-cell communication systems using location information | |
| CN101523932B (en) | Broadcast-based communication in radio or wireless access network to support mobility | |
| EP1543660B1 (en) | Seamless teardown of direct link communication in a wireless LAN | |
| EP1345371A2 (en) | Packet transmission system, packet transmission method, packet transmission device, home agent, mobile terminal, and access router | |
| CN1930903A (en) | Mobile broadband wireless access system for transferring service information during handover | |
| US20090262701A1 (en) | Data transfer method and base station | |
| JP2002320277A (en) | Method for transmitting data to wireless mobile device and method for transmitting data from wireless mobile device to base station | |
| CN102651893B (en) | A kind of changing method of serving BS, system and equipment | |
| WO2007052749A1 (en) | Data transfer method and base station | |
| US8223684B2 (en) | Mobile communication system, gateway, concentrator, and handover control method | |
| US7058030B2 (en) | Method for performing a seamless handoff in a communication system | |
| US20040090936A1 (en) | Method and system for reducting traffic flow to a mobile node during handoff situations | |
| CN1510879A (en) | Method and device for switching shift nodes in wireless local network | |
| CN1301472A (en) | Improving backhaul in cellular mobile communications networks | |
| KR100985748B1 (en) | Apparatus and method for traffic forwarding in wireless communication system | |
| Kalogeiton et al. | Equipping NDN-VANETs with directional antennas for efficient content retrieval | |
| EP1599970B1 (en) | Method and wireless component for avoiding tcp packet retransmission during mobile device handoff | |
| CN1901734B (en) | Method and system for no-damage switching in radio cut-in technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |