CN1248516C - Method for controlling reverse business channel rate based on TDM reverse activated channel - Google Patents
Method for controlling reverse business channel rate based on TDM reverse activated channel Download PDFInfo
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- CN1248516C CN1248516C CN 02136997 CN02136997A CN1248516C CN 1248516 C CN1248516 C CN 1248516C CN 02136997 CN02136997 CN 02136997 CN 02136997 A CN02136997 A CN 02136997A CN 1248516 C CN1248516 C CN 1248516C
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Abstract
The present invention provides a reverse service channel rate control method which increases the utilization rate of reverse channels. Therefore, the separate control of different service classes in the same sector and the rate of reverse service channels of AT is realized through the time division multiplexing of reverse activate channels. In the prior art, reverse activate bits (RAB) in each of the sectors are all identical, so the optimizing control of the reverse rate can not be carried in view of different service classes in the same sector; on the contrary, the reverse activate channels (RA) are further subdivided according to the service priority level of each of the sectors in the present invention, so the reverse rates of service with different priority levels can be finely adjusted by setting reverse activate bits (RAB) of the reverse activate channels; the reverse rates of service with low priority levels are properly reduced and replenished to the service with high priority levels, so the utilization rates of the reverse channels are increased, and the quality of the service (QoS) is improved.
Description
Technical field
The present invention relates to the channel speed control technology in the 3-G (Generation Three mobile communication system), specifically, relate to a kind of in that the single carrier frequency enhancement techniques of CDMA 2000-data-optimized (CDMA2000 1 * EV-DO is called for short the method that improves the reverse traffic channel utilance in 1 * EV-DO) system by time division multiplexing Reverse Activity channel (Reverse Activity Channel).
Background technology
As a kind of high speed, jumbo wireless Internet technology, therefore 1 * EV-DO technology and code division multiple access (CDMA) system compatible and carried out optimal design at Packet data service provides preferable approach for second generation mobile communication system to the evolution of 3G (Third Generation) Moblie CDMA2000 system.
Fig. 1 shows the reference model of 1 * EV-DO system.As shown in Figure 1, reference model is by Access Network (Access Network, be designated hereinafter simply as AN), (Access Terminal accesses terminal, be designated hereinafter simply as AT) and the functional entitys such as air interface that are connected between AN and the AT form, wherein, AN is the network equipment that provides data to be connected between AT and Packet Switch Data Network, and AT is the equipment that provides data to connect to the user.Each sector (Sector) is the service of the AT in the particular range as the part of AN.
Fig. 2 a and 2b show the physical layer channel structure of air interface between AN and the AT, and wherein Fig. 2 a is the channel architecture of forward link and Fig. 2 b is the channel architecture of reverse link.Shown in Fig. 2 a, forward channel by under be listed in each time slot time-multiplexed channel and form: pilot channel, forward direction medium access control (MAC) channel and forward traffic channel or control channel.For forward direction medium access control (MAC) channel, it is again by Reverse Activity (Reverse Activity, be designated hereinafter simply as RA) channel and reverse power control (Reverse Power Control, be designated hereinafter simply as RPC) the channel composition, wherein, AN activates bit (reverse link activity bit is designated hereinafter simply as RAB) stream by send reverse link on the RA channel.Shown in Fig. 2 b, backward channel is made up of access channel and Traffic Channel, and wherein, access channel is used to start and the communicating by letter or respond the message that points to AT of AN by AT, and Traffic Channel is used for sending specific user's business or signaling information to AN by AT.
1 * EV-DO regulation AT can select among 9.6kbps, 19.2kbps, 38.4kbps, 76.8kbps and the 153.6kbps one as its data rate on reverse traffic channel.But the data rate of each AT on reverse traffic channel that is at any one time, connection status all can not surpass a maximum reverse rate MaxRate that allows.When AN finds that the reverse load of a certain sector is excessive or too small, can allow reverse rate MaxRate by current data speed CurrentRate and the maximum that broadcasting RAB on the RA channel in its each sector indicates AT to adjust separately, particularly, if load is excessive, then AN is set at ' 1 ' with RAB, if and load is too small, then AN is set at ' 0 ' with RAB.Because the 1xEV-DO system reverse is supported soft handover, therefore an AT may activate in a plurality of sectors, thereby receives a plurality of RAB of different sectors, and below the combination that so a plurality of sectors are constituted is called the Active Set of this AT.AT will adjust data speed in the following manner:
If the RAB that has a sector in the AT Active Set at least is for ' 1 ' and be right after the preceding that AT does not send data with minimum speed limit (being 9.6kbps) in the transmitting time on reverse traffic channel, then its generate one between 0～1 equally distributed random number x and with transition probability P
DecreaseCompare, wherein P
DecreaseBe reduced to the probability of next stage speed from present rate CurrentRate for the reverse traffic channel data rate of AT.If x＜P
Decrease, then AT is reduced to next stage speed with its current data speed CurrentRate.
If the RAB that has a sector in the AT Active Set at least is for ' 1 ' and one of following state occurs, then AT is set at minimum speed limit with its current data speed CurrentRate: sending any data before the AT before sending data or AT with minimum speed limit on the reverse traffic channel.
If in the AT Active Set all the RAB of sectors all be ' 0 ' and in being right after the preceding transmitting time AT on reverse traffic channel, do not send data with flank speed (being 153.6kbps), then one of its generation between 0～1 equally distributed random number x and with transition probability P
IncreaseCompare, wherein P
IncreaseRise to the probability of upper level speed from present rate CurrentRate for the reverse traffic channel data rate of AT.If x＜P
Increase, then AT allows reverse rate MaxRate to be set at the higher leveled speed than current data speed CurrentRate maximum.If x 〉=P
Increase, then AT allows reverse rate MaxRate to be set at current data speed CurrentRate maximum.
For AN, 1 * EV system stipulates that it must repeat to send Reverse Activity bit (RAB) on the continuous slot of a predetermined number, and this predetermined number is with parameters R ABLength definition, and value is selected from (8,16,32,64).In addition, the position that utilizes parameters R ABOffset definition RAB to change, its value be selected from its value for (0, RABLength/8,2 * RABLength/8,3 * RABLength/8,4 * RABLength/8,5 * RABLength/8,6 * RABLength/8,7 * RABLength/8).
In the above-mentioned method of utilizing RAB control reverse traffic channel data rate, the RAB of each sector reckons without the difference of the class of service of each AT in the same sector to the reverse traffic channel data-rate requirements, in other words, in same sector, although the class of service difference of different AT, as long as the load of this sector is excessive, then AN just in the sector broadcasting value all to will reduce or keep its data rate to indicate all AT for ' 1 ' RAB, and as long as this sector load is too small, then AN just in the sector broadcasting value be that ' 0 ' RAB is to indicate all AT and increase or to keep its MaxRate.Owing to reckon without the otherness of class of service, so the utilance of art methods on reverse traffic channel is not high, has wasted certain customers' capacity and has reduced service quality (QoS) to the data rate requirement.
Summary of the invention
The purpose of this invention is to provide a kind of reverse traffic channel method of rate control, it can improve utilance, user capacity and the service quality (QoS) of reverse traffic channel.
Method of the present invention is based on following consideration: because the different business classification is different for the demand of QoS, therefore can be by in the QoS allowed band, reducing the reverse traffic channel speed of the lower reverse traffic of priority (as downloading data service) or access terminal (AT) as far as possible, and the backward channel capacity that will increase thus offers higher reverse traffic of priority (as uploading data service) or AT, thereby has improved the utilance of reverse traffic channel.For this reason, core concept of the present invention is exactly by the time division multiplexing to the Reverse Activity channel, has realized the control respectively to the reverse traffic channel speed of different business classification or AT in the same sector.
In control method according to reverse traffic channel speed of the present invention, wherein, be divided into during the Reverse Activity channel of each sector with this sector in a plurality of one to one Reverse Activity subchannels of reverse traffic priority level, Access Network is controlled reverse traffic channel speed in the following manner:
(1) when the desire that accesses terminal connects with Access Network, Access Network accesses terminal to this and sends one group of Reverse Activity subchannel parameter, number and this reverse traffic priority level that accesses terminal and in each sector, be assigned with of comprising the reverse traffic priority level of contained each sector of Active Set that accesses terminal
When time-division of Reverse Activity channel in the sector changes with the variation of reverse traffic priority level, Access Network comprises accessing terminal of this sector and sends this and access terminal in the Reverse Activity subchannel parameter of this sector, the reverse traffic priority level that comprises the number of reverse traffic priority level in this sector and respectively access terminal and be assigned with in this sector in Active Set;
(2) Access Network is provided with the Reverse Activity bit on each subchannel; And
(3) access terminal and adjust its data rate on reverse traffic channel according to the Reverse Activity bit with on the corresponding subchannel of its reverse traffic priority level of each sector in this Active Set that accesses terminal.
In the prior art, the Reverse Activity bit of each sector all is identical, therefore can't in same sector, carry out the reverse rate optimal control at different types of service, on the contrary, in the present invention, because the Reverse Activity channel has not been done further segmentation according to the service priority of each sector, therefore can be by setting the Reverse Activity bit of Reverse Activity subchannel, adjust the reverse rate of various priority level business more subtly, thereby improved the utilance of backward channel.
Description of drawings
Fig. 1 shows the reference model of 1 * EV-DO system.
Fig. 2 a and 2b show the physical layer channel structure of air interface between AN and the AT, and wherein Fig. 2 a is the channel architecture of forward link and Fig. 2 b is the channel architecture of reverse link.
Fig. 3 shows the schematic diagram according to method time division multiplexing reverse link RA channel of the present invention.
Embodiment
Below by accompanying drawing specific embodiments of the invention are described.
As mentioned above, various types of traffic in each sector is different for the demand of service quality (QoS), for example for (AT) the business that accesses terminal from Access Network (AN) data download, data traffic on its reverse traffic channel is less, therefore needn't exigent data rate, on the contrary, upload the business of data to Access Network (AN) for access terminal (AT), data traffic on its reverse traffic channel is bigger, therefore exigent data rate.In the prior art, when the load in the sector is big, all AT must not increase even reduce its reverse traffic channel speed to AN in Reverse Activity bit (RAB) the indication sector no matter the AT type of service how, is all passed through to send on Reverse Activity (RA) channel.But therefore the reverse rate that carries the AT of data download business this moment may may make the constant purpose that can reach this sector load of reduction of other AT reverse rate by the reverse rate that reduces these AT fully greater than the speed under its qos requirement.When the load in the sector is big, also similar situation may appear, repeat no more herein.Core concept of the present invention is exactly by the time division multiplexing to RA, has realized the control respectively to the reverse traffic channel speed of different business classification or AT in the same sector.
For this reason, the present invention can time division multiplexing RA channel.The reverse traffic of supposing to be numbered the sector of k has N
kIndividual priority level QR
0, k, QR
1, kQR
Nk-1, kWherein higher to the quality of service requirement of reverse traffic channel data rate reverse traffic (for example uploading data service) has higher priority level, and the lower reverse traffic of reverse traffic channel data rate service quality requirement is had lower priority level, then as shown in Figure 3, AN is divided into the RA channel of this sector also the time N
kIndividual Reverse Activity subchannel R4
0, k, RA
1, kRA
Nk-1, k, each Reverse Activity (RA) subchannel is corresponding with the reverse traffic of one of them priority level, and AN can send the Reverse Activity bit thereon and controls the data rate of pairing priority level reverse traffic on reverse traffic channel.
For each sector, can define different priority level numbers, for example all define a priority level for every kind of reverse traffic, and because the difference that various reverse traffics make up in different sectors, even therefore with a kind of reverse traffic or same AT, its priority level or RA subchannel in each sector also may be different.In addition, the priority level dividing mode in each sector is also not necessarily unalterable, and therefore reasonable is should be according to upgrade in time the time division way of RA channel of this variation.The number of priority level or subchannel is too much unsuitable in each sector, otherwise will increase the live load of AN, influences systematic function, and reasonable is that the number of priority level or subchannel is no more than 8.In addition, reasonable is by adopting clustering method to belong to for having other reverse traffic of same priority to reduce the priority level number the close reverse traffic of reverse traffic channel data rate service quality requirement.
When a certain AT desires to be connected with AN when setting up, in the present invention, AN must transmit one group of its Active Set to this AT and comprise subchannel parameter in each sector, and the subchannel parameter of each sector comprises the number N of priority level in this sector
iWith the priority level numbering n that is this AT or traffic assignments
i, this group channel brief note is (N
i, n
i), the i here is the numbering of sector in this AT Active Set, it travels through the numbering of all sectors in this AT Active Set.Because the priority level of same business in different sectors may be different, so the priority level numbering n of this AT in the different sectors of Active Set
iMay be different, its institute RA subchannel corresponding or that monitor also may difference.
As mentioned above, the reverse traffic priority level dividing mode of each sector may change, and therefore will cause repartitioning of RA subchannel, and correspondingly, the subchannel parameter of the AT of this sector correspondence also will change.For this reason, Access Network should be with these AT of this change notification, that is, all AT that include this sector in Active Set send its Reverse Activity subchannel parameter in this sector, comprise the number of the reverse traffic priority level in this sector and the reverse traffic priority level of distributing for this AT.
AN finish that above-mentioned RA subchannel is divided and with the subchannel parameter notice AT of AT after can be by the Reverse Activity bit on each subchannel being provided with the reverse traffic channel speed of controlling AT.Generally speaking, AN be basically according to the current reverse load in each sector, with the corresponding reverse COS of each RA subchannel and each RA subchannel on AT or professional number be provided with each RA subchannel RAB's, as for concrete set-up mode, it will be apparent to one skilled in the art that it is known, and do not belong to the scope that the present invention relates to yet, therefore repeat no more.
Be in AT with the AN connection status for each, it can transfer to obtain corresponding RAB by pairing RA subchannel in its Active Set is separated.Suppose in its Active Set, to be numbered in the sector of k, the reverse traffic priority level of this AT be numbered i
k, the demodulation time slot of corresponding subchannel is T
k, and reverse traffic priority level number is N in this sector
k, then satisfy following relationship:
T
k?mod?N
k＝i
k
AT in demodulation obtains its Active Set each sector with the corresponding RAB of its reverse traffic priority level after can adjust its data rate on reverse traffic channel.Adjust the mode of the mode of reverse rate according to demodulation result including, but not limited to above-mentioned prior art, promptly, if the equal value of RAB on each RA subchannel of this AT is ' 0 ', then increase its current reverse traffic channel speed or it is remained maximum reverse and allow speed, if it is ' 1 ' that the RAB on each RA subchannel of this AT has a value at least, then this AT reduces its current reverse traffic channel speed or it is remained maximum reverse to allow speed.
The process of the channel data rates of a plurality of AT in the sector being controlled according to the inventive method is below described by way of example.Supposing has 10 AT in this sector, wherein 5 desires are downloaded mass data from AN, desires to upload mass data to AN for other 5.The business of AT data download is less demanding to reverse channel rate, and therefore the business that AT uploads data can be that priority is QR with ongoing delineation of activities in the sector to the having relatively high expectations of reverse channel rate
0And QR
1Two class business.
According to principle of the present invention, the RA channel thus by the time be divided into the subchannel RA of two corresponding service with different priority levels of difference
0And RA
1, the Reverse Activity bit that carries on each subchannel is controlled the reverse traffic channel speed of respective priority various-service respectively.Particularly, for a sub-channel time slot, if its result to 2 modulo operations is 0, then on it Reverse Activity bit of carrying to relate to priority be QR
0The reverse rate control of low rate traffic, if its result to 2 modulo operations is 1, then to relate to priority be QR to the Reverse Activity bit that carries it on
1The reverse rate control of high-rate service.
For 5 AT that desire the data download business, when they and AN connect, AN will send subchannel parameter (2,0) to them, inform in this sector of these AT that priority is divided into two classes and their business belongs to QR
0Level priority.For 5 AT that desire to upload data service, when they and AN connect, AN will send subchannel parameter (2,1) to them, inform in this sector of these AT that priority is divided into two classes and their business belongs to QR
1Level priority.
Subsequently, if when AN finds that the load of this sector is big, can be by being QR to service priority
0AT send value for ' 1 ' RAB to attempt to reduce its reverse rate by being QR to service priority
1AT send value for ' 0 ' RAB to attempt to keep even improve its reverse rate.When if AN finds that the load of this sector is too small, can be by being QR to service priority
1AT send value for ' 0 ' RAB to attempt to improve its reverse rate by being QR to service priority
0AT send value for ' 1 ' RAB to attempt to keep or to reduce its reverse rate constant.
Claims (7)
1. the control method of a reverse traffic channel speed, it is characterized in that, be divided into during the Reverse Activity channel of each sector with this sector in a plurality of one to one Reverse Activity subchannels of reverse traffic priority level, Access Network is controlled reverse traffic channel speed in the following manner:
(1) when the desire that accesses terminal connects with Access Network, Access Network accesses terminal to this and sends one group of Reverse Activity subchannel parameter, number and this reverse traffic priority level that accesses terminal and in each sector, be assigned with of comprising the reverse traffic priority level of contained each sector of Active Set that accesses terminal
When time-division of Reverse Activity channel in the sector changes with the variation of reverse traffic priority level, Access Network comprises accessing terminal of this sector and sends this and access terminal in the Reverse Activity subchannel parameter of this sector, the reverse traffic priority level that comprises the number of reverse traffic priority level in this sector and respectively access terminal and be assigned with in this sector in Active Set;
(2) Access Network is provided with the Reverse Activity bit on each subchannel; And
(3) access terminal and adjust its data rate on reverse traffic channel according to the Reverse Activity bit with on the corresponding subchannel of its reverse traffic priority level of each sector in this Active Set that accesses terminal.
2. the method for claim 1, it is characterized in that, the priority level of reverse traffic is determined the quality of service requirement of reverse traffic channel data rate according to reverse traffic in each sector, and the higher reverse traffic of reverse traffic channel data rate service quality requirement is had higher priority level.
3. method as claimed in claim 2 is characterized in that, will belong to for having other reverse traffic of same priority the close reverse traffic of reverse traffic channel data rate service quality requirement by adopting clustering method.
4. as any described method among the claim 1-3, it is characterized in that each reverse traffic priority level that accesses terminal in contained each sector of its Active Set can be different.
5. as any described method among the claim 1-3, it is characterized in that, in step (2), Access Network according to the current reverse load in each sector, with the corresponding reverse COS of each Reverse Activity subchannel and each Reverse Activity subchannel on the number that accesses terminal the Reverse Activity bit of each Reverse Activity subchannel is set.
6. as any described method among the claim 1-3, it is characterized in that reverse traffic priority level number N satisfies following relationship in the numbering i of reverse traffic priority level in each sector, corresponding subchannel demodulation time slot T and this sector:
Tmod?N＝i。
7. as any described method among the claim 1-3, it is characterized in that, the Reverse Activity bit is adjusted in the step (3) of its reverse traffic channel speed on accessing terminal according to the Reverse Activity subchannel, the equal value of Reverse Activity bit if this accesses terminal on each Reverse Activity subchannel is ' 0 ', then increase its current reverse traffic channel speed or it is remained maximum reverse and allow speed, it is ' 1 ' that Reverse Activity bit if this accesses terminal on each Reverse Activity subchannel has a value at least, and then this accesses terminal and reduces its current reverse traffic channel speed or it is remained maximum reverse to allow speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02136997 CN1248516C (en) | 2002-09-16 | 2002-09-16 | Method for controlling reverse business channel rate based on TDM reverse activated channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02136997 CN1248516C (en) | 2002-09-16 | 2002-09-16 | Method for controlling reverse business channel rate based on TDM reverse activated channel |
Publications (2)
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|---|---|
| CN1484458A CN1484458A (en) | 2004-03-24 |
| CN1248516C true CN1248516C (en) | 2006-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02136997 Expired - Fee Related CN1248516C (en) | 2002-09-16 | 2002-09-16 | Method for controlling reverse business channel rate based on TDM reverse activated channel |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100466807C (en) | 2005-05-19 | 2009-03-04 | 华为技术有限公司 | Method for improving user interactive data service quality |
| CN101227353B (en) * | 2007-01-19 | 2012-04-04 | 华为技术有限公司 | System and method for sending down control parameter when hard handing off connected state among access networks |
| WO2009056030A1 (en) * | 2007-10-23 | 2009-05-07 | Huawei Technologies Co., Ltd. | A method, device and system for operation data transfer |
| CN101702814B (en) * | 2009-11-25 | 2012-02-08 | 中国人民解放军信息工程大学 | Reverse link rate control method, system, base station and terminal |
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