CN100558008C - Method and system thereof that wireless network bandwidth is adjusted - Google Patents
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Abstract
The present invention relates to moving communicating field, disclose method and system thereof that a kind of wireless network bandwidth is adjusted, make wireless network comprehensively the bandwidth stability and the business throughput adjustment network bandwidth.Among the present invention, measure and the measurement of wireless chain control layer resource occupation by the link stability of carrying out wireless network respectively, and the bandwidth of the measurement result of comprehensive two aspects adjustment wireless network, make wireless network transmissions quality and resource utilization reach best balance point.The data block that can send with first success unconfirmed in the data volume of rlc layer data block to be sent and the send window reflects the rlc layer occupation condition to the total of the data volume of a last data block.Can reduce the transmission burden with Event triggered mode reporting measurement result.
Description
Technical field
The present invention relates to moving communicating field, particularly the bandwidth adjustment technology of wireless network.
Background technology
Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short " WCDMA ") be 3G (Third Generation) Moblie (the 3rd Generation, abbreviation " 3G ") three kinds of mainstream standard is a kind of, it has inherited existing global system for mobile communications (Global Systems forMobile communications, be called for short " GSM ") the high and open good characteristics of standardization level, with the GSM network favorable compatibility and interoperability being arranged, is one of development trend of future mobile communications.
In the WCDMA system, data need to carry out channelisation operation before transmission, promptly by multiplying each other with channel code each data symbol are converted to some chips, have therefore increased the bandwidth of signal, have promptly expanded the frequency spectrum of signal.Channel code is Orthogonal Variable Spreading Factor OVSF (Orthogonal Variable SpreadingFactor, be called for short " OVSF ") sign indicating number, is used to keep the orthogonality between user's different channels.The number of chips of each data symbol conversion is called spreading factor (Spreading Factor is called for short " SF "), and promptly the length of channel code is represented with spreading factor.The magnitude range of spreading factor from 4 to 512, but must be 2 integer power.Spreading factor is more little, and the number of chips of each data symbol conversion is more little, and corresponding bandwidth is big more.The WCDMA system is eating dishes without rice or wine fixedly to take under the situation of 3.84M bandwidth, realizes higher data rate by the spreading factor that adopts littler length.But the reducing of spreading factor also makes spreading gain diminish relatively, makes that the message signale demodulation performance is low, and then under similarity condition, is easy to generate the higher error rate.For fear of this point, guarantee to accept quality, base station (NodeB) is by providing bigger transmitting power by way of compensation.But still exist transmitting power to acquire a certain degree, NodeB can't provide the situation of extra compensation again, the down link step-out takes place in the network in the case easily, and then cause call drop, therefore need by reducing the method for service bandwidth, increase spreading gain,, make link tend towards stability to reduce the error rate of down link.
On the other hand, because high rate data transmission is all very big to sign indicating number resource, Iub port band width and consumption of resource, when the actual needs data quantity transmitted hour, for conserve network resources, should remain on the lower transmission bandwidth, after data volume increases, adjust transmission bandwidth more in real time, guarantee reasonably to use resource.
In order to guarantee the stability of network link, reasonably use resource, prior art mainly adopts dual mode to adjust the network bandwidth, and a kind of is to adjust bandwidth of air-interface according to the traffic carrying capacity of current network, and another kind is to adjust bandwidth of air-interface according to link stability.
The method of adjusting bandwidth of air-interface according to traffic carrying capacity at present commonly used as shown in Figure 1, mainly according to third generation partner program (3rd Generation Partnership Project, abbreviation " 3GPP ") buffer memory that defines in the agreement takies (Buffer Occupancy, be called for short " BO ") this measured value, adjust bandwidth of air-interface.BO is by Radio Link control (Radio Link Controller is called for short " RLC ") layer statistical report, reflection be the data volume that rlc layer is received, comprise the data that retransmit with needs that do not send as yet.
In step 110, send BO and measure request by Radio Resource control (Radio Resource Control is called for short " RRC ") course rlc layer.In step 120, rlc layer returns BO and measures the request response, and the BO value of window is monitored, and the method that adopts reporting events or periodic report is to rrc layer reporting measurement result.Rlc layer is compared the current BO numerical value that measures and two default threshold values, if measured value is higher than default Upper threshold, then enters step 130, reports the A event measurement report to rrc layer.In step 140, after rrc layer receives this report, raise bandwidth of air-interface.If measured value is lower than default Lower Threshold, then enter step 150, rlc layer reports the B event measurement report to rrc layer.In step 160, rrc layer reduces bandwidth of air-interface according to the B event measurement report that receives.Thereby reach dynamic adjustment bandwidth of air-interface, the purpose of optimizing allocation of resources.
Method according to link stability adjustment bandwidth commonly used is divided into again according to the bandwidth method of adjustment of descending sign indicating number transmitting power and according to the downlink traffic channel Block Error Rate bandwidth method of adjustment of (Block Error Ratio is called for short " BLER ").
According to the adjustment bandwidth method of descending sign indicating number transmitting power as shown in Figure 2, in step 210, radio network controller (Radio Network Controller is called for short " RNC ") sends descending sign indicating number transmitting power (Transmit Code Power is called for short " TCP ") to NodeB and measures request.Then enter step 220, NodeB returns descending TCP and measures response, and according to the requirement of RNC, the method reporting measurement result in employing incident or cycle.When adopting the Event triggered report method, NodeB compares current descending sign indicating number transmitting power and two the default thresholdings that measure, if measured value is higher than default Upper threshold, then enters step 230, sends the E event measurement report to RNC.Then enter step 240, RNC reduces bandwidth of air-interface according to this report.If measured value is lower than default Lower Threshold, then enter step 250, NodeB sends the F event measurement report to RNC.Then enter step 260, RNC raises bandwidth of air-interface according to this F event measurement report.Reach the stable link of eating dishes without rice or wine, avoid causing the purpose of call drop because of power limited.
The method of adjusting bandwidth according to downlink traffic channel BLER as shown in Figure 3, in step 310, RNC sends descending BLER to subscriber equipment (User Equipment is called for short " UE ") and measures request.Then enter step 320, UE returns response, and according to the requirement of RNC, the method reporting measurement result in employing incident or cycle.When adopting the Event triggered report method, UE compares the current BLER value that measures and two default thresholdings, if measured value is higher than default Upper threshold, then enters step 330, reports the current BLER value of RNC excessive.Then enter step 340, after RNC receives this message, reduce bandwidth of air-interface.If measured value is lower than default Lower Threshold, then enter step 350, report the current BLER value of RNC too small.In step 360, after RNC receives this message, raise bandwidth of air-interface.Reach the stable link of eating dishes without rice or wine, avoid causing the purpose of call drop because of power limited.
In actual applications, there is following problem in such scheme: existing bandwidth method of adjustment is isolated mutually, has the situation of contradiction, can not reach the effect that consistent link is optimized allocation of resources.
Cause the main cause of this situation to be,, therefore when each mechanism is implemented simultaneously, cause the situation of contradiction easily because existing bandwidth method of adjustment is isolated relatively.For example, under the situation of channel quality degrades, down transmitting power reaches the predetermined Upper threshold of transmitting power, causes the bandwidth downward modulation., because channel quality degrades, BO raises, and can cause bandwidth to raise again, thereby table tennis adjustment is taken place, and does not reach the purpose of consistent link.And BO measures and not to comprise in the send window, but has sent this part data of also not receiving feedback, and the measured value that causes reporting takies low than actual window, have error, influences the adjustment of bandwidth.And downlink traffic channel BLER is measured and the result is reported by UE, has increased the weight of the burden of UE, and gives the correct time on measurement result and need expend certain interface-free resources.
Summary of the invention
In view of this, method and system thereof that main purpose of the present invention is to provide a kind of wireless network bandwidth to adjust make wireless network comprehensively the bandwidth stability and the business throughput adjustment network bandwidth.
For achieving the above object, the invention provides the method that a kind of wireless network bandwidth is adjusted, comprise following steps:
A. carrying out the link stability of described wireless network respectively measures and the measurement of wireless chain control layer resource occupation;
B. comprehensively adjudicate according to the result that described link stability is measured and described wireless chain control layer resource occupation is measured, and adjust described wireless network bandwidth according to described court verdict.
Wherein, step B also comprises following steps:
More than or equal to first thresholding that presets, and described link stability measurement result reduces described wireless network bandwidth during more than or equal to second thresholding that presets in described wireless chain control layer resource occupation measurement result;
During smaller or equal to the 3rd thresholding that presets, reduce described wireless network bandwidth in described wireless chain control layer resource occupation measurement result;
More than or equal to described first thresholding, and described link stability measurement result raises described wireless network bandwidth during less than described second thresholding in described wireless chain control layer resource occupation measurement result;
Wherein, described first thresholding is greater than described the 3rd thresholding.
In this external described method, the measurement of described wireless chain control layer resource occupation is the measurement that the data block that first success unconfirmed in the data volume of wireless chain control layer data block to be sent and the send window sends is arrived the data volume of this last data block of window.
In this external described method, described link stability measurement is that the descending sign indicating number transmitting power of Radio Link is measured.
In this external described method, described link stability measurement is that the Block Error Rate on the down link is measured.
In this external described method, the measurement of described wireless chain control layer resource occupation is that the wireless chain control layer buffer memory takies measurement.
In this external described method, the link stability measurement result of described wireless network and wireless chain control layer resource occupation measurement result report or report with periodic manner in the Event triggered mode.
The system that the present invention also provides a kind of wireless network bandwidth to adjust comprises:
Measurement module is used to carry out the link stability measurement and the measurement of wireless chain control layer resource occupation of described wireless network;
Comprehensive judging module is used for the measurement result of described measurement module is comprehensively adjudicated;
Adjusting module is used for adjusting described wireless network bandwidth according to the court verdict of described comprehensive judging module.
Wherein, more than or equal to default first thresholding, and judge and reduce described wireless network bandwidth during more than or equal to default second thresholding by the link stability measurement result in wireless chain control layer resource occupation measurement result for described comprehensive judging module; , judge and reduce described wireless network bandwidth during in described wireless chain control layer resource occupation measurement result smaller or equal to default the 3rd thresholding; More than or equal to described first thresholding, and described link stability measurement result is judged and is raised described wireless network bandwidth during less than described second thresholding in described wireless chain control layer resource occupation measurement result.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, measure and the measurement of wireless chain control layer resource occupation by the link stability of carrying out wireless network respectively, and the measurement result of comprehensive two aspects is adjusted the bandwidth of wireless network, make wireless network transmissions quality and resource utilization reach best balance point, when ensureing transmission link stability, saved limited Internet resources, and prevented that wireless network from adjusting bandwidth and table tennis adjustment is taken place according to the one-sided measurement result that may conflict mutually respectively.
Since in wireless chain control layer resource occupation measurement result more than or equal to first thresholding, and the link stability measurement result is during more than or equal to second thresholding, reduce wireless network bandwidth, thereby avoided that bandwidth is excessive to cause required transmitting power to increase, guaranteed that transmitting power is controlled in the scope that can bear; Owing to during smaller or equal to the 3rd thresholding, reduce wireless network bandwidth in wireless chain control layer resource occupation measurement result, make wireless network when traffic carrying capacity reduces, can correspondingly reduce the resource expenditure, avoid meaningless ground consumption of network resources; Since in wireless chain control layer resource occupation measurement result more than or equal to first thresholding, and the link stability measurement result is during less than second thresholding, raise wireless network bandwidth, make wireless network when traffic carrying capacity increases, can improve transmission rate by increasing bandwidth, alleviate the busy extent of network.
The data block that sends with first success unconfirmed in the data volume of rlc layer data block to be sent and the send window reflects the rlc layer occupation condition to the total of the data volume of a last data block, comprise all data volumes that need send and might send of rlc layer, embodied the traffic carrying capacity of network more accurately.
By carrying out the descending TCP measurement of Radio Link by NodeB and when satisfying trigger conditions, measurement result being reported, make and under the situation that does not increase the burden of eating dishes without rice or wine, reflect the link degree of stability.
Description of drawings
Fig. 1 is a method flow diagram of adjusting the network bandwidth in the prior art according to BO;
Fig. 2 is a method flow diagram of adjusting the network bandwidth in the prior art according to descending TCP;
Fig. 3 is a method flow diagram of adjusting the network bandwidth in the prior art according to BLER;
Fig. 4 is the wireless network bandwidth method of adjustment flow chart according to first embodiment of the invention;
Fig. 5 takies schematic diagram according to rlc layer send window in the wireless network bandwidth method of adjustment of first embodiment of the invention;
Fig. 6 is the wireless network bandwidth method of adjustment flow chart according to second embodiment of the invention;
Fig. 7 is the wireless network bandwidth Adjustment System structure chart according to third embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is, wireless network is measured and the measurement of RLC resource occupation by carrying out link stability respectively, comprehensive two aspect measurement results are adjusted the network bandwidth, make the transmission quality and the resource utilization of wireless network reach optimal balance point, when ensureing transmission link stability, saved Internet resources.
According to inventive principle first embodiment of the invention wireless network bandwidth adjustment mode is described below.
As shown in Figure 4, in step 410, network side issues the rlc layer resource occupation respectively and measures request and descending TCP measurement request.Specifically, network side sends descending TCP by RNC to NodeB and measures request, and reports mode to be configured to the Event triggered mode descending TCP measurement result in request; Simultaneously, network side issues the rlc layer Internet resources by rrc layer to rlc layer and measures request, can report mode to be configured to the Event triggered mode measurement result in request equally.
Then enter step 420, rlc layer is after receiving that the rlc layer resource occupation is measured request, data block that first success unconfirmed in the data volume of rlc layer data block to be sent and the send window sends is measured to the data volume of this last data block of window, and the reporting measurement result.Wherein, data block takies as shown in Figure 5 in the send window.Equally, NodeB carries out descending TCP to Radio Link and measures after receiving descending TCP request, and the reporting measurement result.
Specifically, the mode that reports of rlc layer resource occupation measurement result is the Event triggered mode, rlc layer data block that first success unconfirmed sends in to the data volume of rlc layer data block to be sent and send window to the data volume of this last data block of window measure the time, if measurement result is more than or equal to first thresholding that presets, trigger event A then, report this measurement result, informing network side rlc layer resource occupation reaches first thresholding; If measurement result is smaller or equal to the 3rd thresholding that presets, then trigger event B reports this measurement result, and informing network side rlc layer resource occupation is lower than the 3rd thresholding.Wherein, the data block that first success unconfirmed sends in the data volume of rlc layer data block to be sent and the send window is to the data volume of a last data block, all data volumes that need send and might send of rlc layer have been comprised, reflect the rlc layer occupation condition more accurately, embodied the traffic carrying capacity of network.
Equally, because the mode that reports of descending TCP measurement result also is the Event triggered mode, NodeB carries out descending TCP when measuring to Radio Link, if descending TCP measurement result is more than or equal to second thresholding that presets, trigger event E then, NodeB reports this descending TCP measurement result, and its transmitting power of informing network side is more than or equal to second thresholding; If descending TCP measurement result is smaller or equal to the 4th thresholding that presets, trigger event F then, NodeB reports this descending TCP measurement result, and its transmitting power of informing network side is smaller or equal to the 4th thresholding.By carrying out descending TPC measurement by NodeB and when satisfying trigger conditions, measurement result reported, make under the situation that does not increase the burden of eating dishes without rice or wine, accurately reflecting the link degree of stability.
Then enter step 430, network side is comprehensively adjudicated according to the descending TCP measurement result and the RLC resource occupation measurement result that receive:
If the rlc layer resource occupation measurement result that network side receives more than or equal to first thresholding that presets and descending TCP measurement result more than or equal to second thresholding (condition 4a) that presets, be that network side has been received RLC resource occupation measurement result that is reported by incident A triggering and the descending TCP measurement result that is reported by incident E triggering, then judgement reduces the network bandwidth, enter step 440, network side reduces the network bandwidth according to court verdict, network side can be by the radio link reconfiguration flow process of Iub interface, the radio bearer of Uu interface (Radio Bearers, abbreviation " RB ") reshuffles flow process or transmission channel and reshuffle the flow process reduction network bandwidth, thereby avoided that bandwidth is excessive to cause required transmitting power to increase, guaranteed that transmitting power is controlled in the scope that can bear;
If rlc layer resource occupation measurement result is smaller or equal to the 3rd thresholding (condition 4b) that presets, be that network side is received the RLC resource occupation measurement result that is reported by incident B triggering, then same judgement reduces the network bandwidth, enter step 450, network side reduces the network bandwidth according to court verdict, make wireless network when traffic carrying capacity reduces, can correspondingly reduce the resource expenditure, avoid meaningless ground consumption of network resources;
If rlc layer resource occupation measurement result more than or equal to first thresholding and descending TCP measurement result less than second thresholding (condition 4c), be that network side receives the descending TCP measurement result that is reported by incident A triggering, but do not receive by incident E and trigger the rlc layer resource occupation measurement result that reports, though or receive and trigger the measurement result report by incident E but received subsequently by incident F and triggered the measurement result that reports, then the network bandwidth is raised in judgement, enter step 460, network side raises the network bandwidth according to court verdict, make wireless network when traffic carrying capacity increases, can improve transmission rate by increasing bandwidth, alleviate the busy extent of network.
In addition, in the present embodiment, rlc layer resource occupation measurement result and descending TCP measurement result can also report by the cycle triggering mode, and network side is same comprehensively adjudicates according to the measurement result that reports, and adjusts the network bandwidth according to court verdict.
The method and first execution mode that the second embodiment of the invention wireless network bandwidth is adjusted are roughly the same, its difference only is, in first execution mode, the measurement of rlc layer resource occupation is the measurement that the data block that first success unconfirmed in the data volume of rlc layer data block to be sent and the send window sends is arrived the data volume of this last data block of window, and the link stability measurement is that the descending TCP that Radio Link carries out is measured; And in the present embodiment, the measurement of rlc layer resource occupation is the BO measurement to rlc layer, and the link stability measurement is that the BLER on the down link measures.
Specifically as shown in Figure 6, in step 610, network side sends BO to rlc layer and measures request, send down link BLER to UE and measure request, and respectively in two requests the corresponding measurement result of configuration report mode, can be the periodic report mode, or Event triggered reports mode.
Then enter step 620, rlc layer and UE receive and carry out that rlc layer BO measures and the BLER of down link measures after separately the request respectively, and report mode to report corresponding measurement result according to the result who disposes.
Then enter step 630, network side is comprehensively adjudicated according to the rlc layer BO measurement result and the down link BLER measurement result that receive, if the BO measurement result is more than or equal to first thresholding that presets, and the BLER measurement result is more than or equal to second thresholding that presets, 6a promptly satisfies condition, then judgement reduces the network bandwidth, enters step 640, and network side reduces the network bandwidth according to court verdict; If the BO measurement result is smaller or equal to the 3rd thresholding that presets, the 6b that promptly satisfies condition then adjudicates equally and reduces the network bandwidth, enters step 650, and network side reduces the network bandwidth according to court verdict; If the BO measurement result is more than or equal to first thresholding, and the BLER measurement result is less than second thresholding, the 6c that promptly satisfies condition, and then the network bandwidth is raised in judgement, enters step 660, and network side raises the network bandwidth according to court verdict.Wireless network rlc layer BO measures and the BLER of down link measures by carrying out respectively, the measurement result of comprehensive two aspects is adjusted the bandwidth of wireless network, make wireless network transmissions quality and resource utilization reach best balance point, when ensureing transmission link stability, saved limited Internet resources, and prevented that wireless network from adjusting bandwidth and table tennis adjustment is taken place according to the one-sided measurement result that may conflict mutually respectively.
What deserves to be mentioned is, the link stability measurement comprises that descending TCP measures and down link BLER measures among the present invention, the measurement of rlc layer resource occupying comprise that rlc layer BO measures and data block that first success unconfirmed in the data volume of rlc layer data block to be sent and the send window is sent to the measurement of the data volume of this last data block of window.Network side can be not limited to the compound mode of mentioning in above each execution mode according to practical application arrange in pairs or groups voluntarily link stability metering system and rlc layer resource occupying metering system.
The system that the third embodiment of the invention wireless network bandwidth is adjusted as shown in Figure 7, comprise the measurement module that link stability is measured and the rlc layer resource occupation is measured that is used to carry out wireless network, be used for comprehensive judging module that the measurement result of measurement module is comprehensively adjudicated, and the adjusting module that is used for adjusting according to the court verdict of comprehensive judging module wireless network bandwidth.
Specifically, network side is measured and the measurement of rlc layer resource occupation by the link stability that measurement module carries out wireless network respectively, and notifies comprehensive judging module with measurement result.More than or equal to default first thresholding, and the link stability measurement result is judged the reduction wireless network bandwidth during more than or equal to default second thresholding to comprehensive judging module in rlc layer resource occupation measurement result; , judge and reduce wireless network bandwidth during in rlc layer resource occupation measurement result smaller or equal to default the 3rd thresholding; More than or equal to first thresholding, and the link stability measurement result is judged and is raised wireless network bandwidth during less than second thresholding in rlc layer resource occupation measurement result.Judging module is carried out network bandwidth adjustment according to its corresponding court verdict.
First thresholding is greater than the 3rd thresholding in the embodiments of the present invention.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (7)
1. the method that wireless network bandwidth is adjusted is characterized in that, comprises following steps:
A. carrying out the link stability of described wireless network respectively measures and the measurement of wireless chain control layer resource occupation;
B. comprehensively adjudicate according to the result that described link stability is measured and described wireless chain control layer resource occupation is measured, and adjust described wireless network bandwidth according to described court verdict
Described comprehensive judgement further comprises in the following steps one or more:
More than or equal to first thresholding that presets, and described link stability measurement result is judged and is reduced described wireless network bandwidth during more than or equal to second thresholding that presets in described wireless chain control layer resource occupation measurement result;
, judge and reduce described wireless network bandwidth during in described wireless chain control layer resource occupation measurement result smaller or equal to the 3rd thresholding that presets;
More than or equal to described first thresholding, and described link stability measurement result is judged and is raised described wireless network bandwidth during less than described second thresholding in described wireless chain control layer resource occupation measurement result;
Wherein, described first thresholding is greater than described the 3rd thresholding.
2. the method that wireless network bandwidth according to claim 1 is adjusted, it is characterized in that the measurement of described wireless chain control layer resource occupation is the measurement that the data block that first success unconfirmed in the data volume of wireless chain control layer data block to be sent and the send window sends is arrived the data volume of this last data block of window.
3. the method that wireless network bandwidth according to claim 1 is adjusted is characterized in that, described link stability measurement is that the descending sign indicating number transmitting power of Radio Link is measured.
4. the method that wireless network bandwidth according to claim 1 is adjusted is characterized in that, described link stability measurement is that the Block Error Rate on the down link is measured.
5. the method that wireless network bandwidth according to claim 1 is adjusted is characterized in that the measurement of described wireless chain control layer resource occupation is that the wireless chain control layer buffer memory takies measurement.
6. the method for adjusting according to each described wireless network bandwidth in the claim 1 to 5, it is characterized in that the link stability measurement result of described wireless network and wireless chain control layer resource occupation measurement result report or report with periodic manner in the Event triggered mode.
7. the system that wireless network bandwidth is adjusted is characterized in that, comprises:
Measurement module is used to carry out the link stability measurement and the measurement of wireless chain control layer resource occupation of described wireless network;
Comprehensive judging module is used for the measurement result of described measurement module is comprehensively adjudicated;
Adjusting module is used for adjusting described wireless network bandwidth according to the court verdict of described comprehensive judging module;
Wherein said comprehensive judging module is further used for carrying out following one or more judgement when comprehensively adjudicating:
More than or equal to first thresholding that presets, and described link stability measurement result is judged and is reduced described wireless network bandwidth during more than or equal to second thresholding that presets in described wireless chain control layer resource occupation measurement result;
, judge and reduce described wireless network bandwidth during in described wireless chain control layer resource occupation measurement result smaller or equal to the 3rd thresholding that presets;
More than or equal to described first thresholding, and described link stability measurement result is judged and is raised described wireless network bandwidth during less than described second thresholding in described wireless chain control layer resource occupation measurement result;
Wherein, described first thresholding is greater than described the 3rd thresholding.
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