CN100433925C - Method for virtual soft hand-off - Google Patents
Method for virtual soft hand-off Download PDFInfo
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- CN100433925C CN100433925C CNB2005101305756A CN200510130575A CN100433925C CN 100433925 C CN100433925 C CN 100433925C CN B2005101305756 A CNB2005101305756 A CN B2005101305756A CN 200510130575 A CN200510130575 A CN 200510130575A CN 100433925 C CN100433925 C CN 100433925C
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Abstract
The present invention discloses a virtual soft switch method which comprises: an access terminal measures that an SINR of a target base station cell is larger than that of a source base station cell; a cell identification in a first backward channel is changed from the base station cell to the target base station cell; an access network controller fills downlink data to the target base station; the access terminal feeds back byte sequence number information corresponding to data finally received by the access terminal, and changes the cell identification in the second backward channel from the source base station to the target base station; the source base station stops transmitting the data; the target base station transmits a data sequence corresponding to the byte sequence number information to the access terminal. The present invention enables the target base station to rapidly and accurately know data can be transmitted, eliminates time delay and flutter, and ensures the service quality of wireless grouped data application with high real time requirements.
Description
Technical field
The present invention relates to the grouped data transmission technology field in the mobile communication system, particularly relate to the method for virtual soft.
Background technology
Development along with communication industry, increasing sign shows that network IPization is the trend of communication industry development, (Time Division Multiplex, TDM) Cheng Zai voice service can be progressively but (Voice Over IP VoIP) substitutes by ip voice inevitably for former cause time division multiplexing.In order to make code division multiple access insert (Code Division Multiple Access, CDMA) 2000 systems support to comprise VoIP better at interior wireless composite multimedia service, world wide web (www) for example, VoIP, visual telephone (VT) etc., and the development that adapts to the wireless Internet technology better, Qualcomm has developed high data rate (High Data Rate, HDR) technology, and be accepted as the IS856 standard by telecommunications industry association/electronic industries association (TIA/EIA), be called HRPD (high rate packet data) (High Rate PacketData again, HRPD) or 1x EV-DO, wherein 1x represents that it is identical with radio frequency bandwidth and spreading rate that CDMA2000 1x system (corresponding TIA/EIA standard is IS2000) is adopted, has good backwards compatibility; EV (Evolution) represents that it is the evolution version of CDMA2000 1x; DO (Data Optimization) represents that it is special at Packet data service and the technology through having optimized.Up to now, the EV-DO air-interface standard has developed and Release 0 and two versions of Release A, and the TIA/EIA standard corresponding with it is respectively IS856-0 and IS856-A.
Adopt the code division multiplexing mode to compare with CDMA2000 1x system forward link, 1x EV-DO system forward link mainly adopts time division multiplexing mode, each serving sector of base station at any time forward direction can only be (the Access Termination that accesses terminal simultaneously, AT) provide service, thereby the resource utilization of having avoided yard same sector multi-user interference that branch causes and high low speed user share system power to cause descends.In order further to improve the resource utilization of 1x EV-DO system, 1x EV-DO system forward link employing virtual soft technology generation has been replaced the traditional soft handoff technique in the CDMA2000 1x system.Because only there is a data passage simultaneously in the forward link of virtual soft, and may there be a plurality of data channel simultaneously in the forward link that traditional soft is switched, so the forward direction virtual soft technology of 1x EV-DO system has been eliminated the additional system expense that the traditional soft handoff technique produces in the CDMA2000 1x system.
Below the simple process of describing virtual soft.The Signal Interference and Noise Ratio (SINR) of all pilot tones in the continuous measurement Active Set of accessing terminal is therefrom selected the base station of SINR maximum, as the Current Serving BTS of oneself; Access terminal and to carry out data communication with Current Serving BTS, but all have the control access between all base stations in it and the pilot tone Active Set.When if the base station of SINR maximum changes in the Active Set, access terminal and data channel to be switched to the serving BS of new SINR maximum from Current Serving BTS.Such as: T1 is the SINR maximum of base station A constantly, and T2 is the SINR maximum of base station B constantly; Then T1 Current Serving BTS constantly is base station A; T2 Current Serving BTS constantly will be transformed to base station B by base station A, and wherein base station A is called source base station, and base station B is called target BS.Just in the virtual soft process of this conversion Current Serving BTS, will cause professional short interruption, thereby the time delay and the shake that have increased upper-layer service.
Time delay and shake that the virtual soft technology is introduced, to browse such as news, general packet data application such as file download can tolerate that normally it is lower that these packet data application require real-time, they pay close attention to high-speed data transmission speed more.But the wireless packet data of having relatively high expectations for real-times such as VoIP is used, and time delay and shake index are had harsh requirement, for example acceptable end-to-end maximum delay preferably less than 285 milliseconds and delay variation preferably less than 80 milliseconds.Otherwise bigger time delay and shake have limited the voice call quality of rapid deterioration VoIP to the wireless packet data application and development that real-times such as VoIP are had relatively high expectations.
Therefore, how to improve time delay and shake that virtual soft is introduced,, become the technical problem of being badly in need of solution to guarantee the service quality of the wireless packet data application that real-times such as VoIP are had relatively high expectations as far as possible.
Defined respectively in existing IS856-0 standard and the IS856-A standard based on data rate control (Data Rate Control, virtual handoff technique DRC) and based on data source control (Data SourceControl, virtual handoff technique DSC).Simply introduce these two kinds of prior aries below respectively.
Prior art one:
Shown in Figure 1 is the virtual soft technology based on DRC that defines in the IS856-0 standard.With reference to Fig. 1, at first, the source base station of the data of coming from network by sub-district (Cell) A sends to and accesses terminal, and after the SINR of sub-district B surpassed sub-district A, the cell ID that carries in the reverse DRC channel became B by A; When system awares after DRC changes, the source base station of sub-district A stops to send forward data, and the target BS of sub-district B begins to send data then.
In this process, when the DRC Cover of the sub-district of thinking that when representing in the DRC channel to access terminal forward channel is best changes, target BS need spend a period of time and obtain the forward data formation from access network controller, thereby cause time delay bigger, can not satisfy service quality (QoS) requirement of delay sensitive business.As shown in Figure 2, before the moment, to data sending of access terminal, the forward data buffering area of sub-district B is empty by sub-district A at t1; At t1 constantly, after accessing terminal DRC sensing sub-district B, sub-district B needs at first to access network controller (ANC) application forward data; Behind t2 moment DSR, sub-district B just begins to send forward data to terminal.From said process as can be seen, t1 interrupts to the interior during this period of time forward data transmission of t2, and promptly propagation delay time is (t2-t1), thereby has increased the propagation delay time of upper-layer service.
Prior art two:
Because the time delay based on the virtual soft of DRC in prior art one IS856-0 standard is bigger, can not satisfy the qos requirement of delay sensitive business.Therefore in IS856-A,,, further increased the DSC channel newly to satisfy the qos requirement of delay sensitive business in order to reduce the time delay of virtual soft.Change for the previous period at DRC Cover, the cell ID in the DSC channel takes the lead in changing, and makes target BS to shift the forward data formation from source base station in advance.When DRC Cover really changed, target BS had been ready to forward data, can not have interruptedly directly to send forward data to terminal.
Shown in Figure 3 is the virtual soft technology based on DSC of IS856-A standard definition.With reference to figure 3, at first, the source base station of the data of coming from network by sub-district A sends to and accesses terminal; After the SINR of sub-district B surpassed sub-district A, the DSC channel took the lead in becoming B by A, prepares data to be sent in advance with indicating cell B; When the cell ID among the DRC became B by A, sub-district B was immediately to data sending of access terminal.
As shown in Figure 4, at t1 constantly, DSC takes the lead in changing, and establishes the A base station and has sent to data sequence number x, owing to the data sequence number y that can not accurately predict this moment in t2 moment A base station, so for the purpose of conservative, ANC is x+1 to the data origination that the B base station sends.At t2 constantly, DRC changes in a flash, because the B base station does not know that the A base station has sent to data sequence number y, so will begin to send data from x+1.Arrive t3 so constantly, just overlapped data (y-x) transmission is finished.Therefore, although eat dishes without rice or wine sending data continuously,, make and have a greatly reduced quality based on the virtual soft effect of DSC because time delay (t3-t2) has still been introduced in the influence of overlapped data.
Summary of the invention
In view of this, the present invention proposes a kind of method of virtual soft, its purpose is, makes the not data of sending overlap of target BS, thereby improve time delay and shake that prior art is introduced, further guarantee the service quality that unlimited grouping that real-time such as VoIP is had relatively high expectations is used.
According to above-mentioned purpose, the invention provides a kind of method of virtual soft, this method may further comprise the steps: A. accesses terminal the SINR that measures the target BS sub-district greater than the SINR of source base station sub-district, changes the cell ID in first backward channel into the target BS sub-district from the source base station sub-district; B. access network controller is filled downlink data to target BS; C. access terminal by the 3rd backward channel feedback byte serial number information corresponding, and change the cell ID in second backward channel into the target BS sub-district from the source base station sub-district with the last received data that access terminal; D. source base station stops to data sending of access terminal; Target BS will utilize the formation of described byte serial number information established data to send to described accessing terminal.
According to one embodiment of the invention, byte serial number information corresponding with the last received data that access terminal described in the step C is: the last byte sequence number of the last received data that access terminal.Utilize the formation of described byte serial number information established data to be among the step D: the Next Sequence with the last byte sequence number of the described last received data that access terminal is the data of starting point.
Further comprise before the C after the steps A: access terminal and constantly feed back the last byte sequence number of current last received data by the 3rd backward channel.
According to another embodiment of the present invention, byte serial number information corresponding with the last received data that access terminal described in the step C is: the byte sequence number of the continuous data expected of accessing terminal.Utilize the formation of described byte serial number information established data to be among the step D: the byte sequence number with the described continuous data expected of accessing terminal is the data of starting point.
Before the step C, and further comprise when source base station is determined to send last data: source base station sends discontinuous data to accessing terminal.Among the step C, access terminal receive these discontinuous data after, the byte sequence number of the continuous data of being expected by the 3rd backward channel feedback.
Preferably, described first backward channel is the DSC channel.
Preferably, described second backward channel is the DRC channel.
Preferably, described the 3rd backward channel is a reverse data channel.
In technique scheme, access terminal and to feed back the last byte sequence number of the last received data that access terminal by the affirmative acknowledgement (ACK) ACK signaling in the 3rd backward channel.
In technique scheme, accessing terminal can be by the access terminal byte sequence number of the continuous data expected of the negative acknowledge NAK signaling in the 3rd backward channel feedback.
Further comprise among the step D: target BS empties the data except that utilizing the formation of described byte serial number information established data.
From such scheme as can be seen, because utilization of the present invention accesses terminal to the Access Network feedback and the relevant information of last received data that accesses terminal, make target BS can know send what data rapidly and accurately according to described information, can not send the overlapped data that source base station had sent, can missing data yet, thereby thoroughly eliminated the time delay and the jitter problem of the target BS sending overlap data introducing that exists in the virtual soft technology that defines in the TIA/EIA/IS856-A standard, guaranteed the service quality of the wireless packet data application that real-times such as VoIP are had relatively high expectations based on DSC.
Description of drawings
Fig. 1 is based on the schematic diagram of the virtual soft technology of DRC in the prior art one;
Fig. 2 is the sequential chart of prior art one;
Fig. 3 is based on the schematic diagram of the virtual soft technology of DSC in the prior art two;
Fig. 4 is the sequential chart of prior art two;
Fig. 5 is the sequential chart of improved virtual soft technology based on DSC in the first embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in more detail by the following examples.
From the data transmission procedure of virtual soft as can be seen, change DRC when accessing terminal before, access terminal always at the downlink data of reception sources base station; So change in a flash the last byte sequence number of the downlink data of knowing that source base station sends most of accessing terminal at DRC.Therefore, the present invention utilizes to access terminal to report the information of the data that receive from source base station of accessing terminal at last to Access Network, promptly with the last relevant information of downlink data that sends of source base station, make target BS know the starting point that sends data enough fast and accurately, thereby avoid target BS sending overlap data, eliminated fully because time delay and the shake that overlapped data is introduced.
Yet, in existing TIA/EIA/IS856-A standard, access terminal and on backward channel, feed back the byte sequence number of the downlink service data of losing usually with the mode of negative response (NAK) to Access Network.If in the virtual soft process, the downlink data byte that source base station sends is not lost, terminal will can not be fed back the NAK instruction, calculate the last downlink data byte sequence number that sends of source base station thereby target BS can not obtain any information from backward channel.
For this reason, first embodiment of the invention accesses terminal during virtual soft and utilizes a certain predetermined instruction constantly to feed back the last byte sequence number of the downlink data that receives to Access Network by backward channel, when DRC changed, target BS just can add 1 back to the byte sequence number that comprises in this instruction as data origination so.In the following description, adopt affirmative acknowledgement (ACK) (ACK) mode, but those skilled in the art understand that obviously the present invention is not limited thereto as above-mentioned predetermined instruction.
With reference to Fig. 5, the method for first embodiment of the invention soft handover is as follows:
Step 1, Access Network by the A base station to the transmission business datum that accesses terminal, the SINR of all base stations in the continuous measurement Active Set of accessing terminal.Cell ID among backward channel DRC and the DSC all is A at this moment.
Step 2, when at t1 constantly, the SINR that measures the B base station cell of accessing terminal is during greater than the SINR of A base station cell, and accessing terminal changes the cell ID in the DSC channel into B from A.
After A awared the base station cell ID in the DSC channel and changes, notice ANC sent the downlink data formation to the B base station.Suppose that the sequence number that current A base station has sent data is x, ANC is starting point with x+1 so, fills the downlink data formation to the B base station.
Step 3 accesses terminal during virtual soft, constantly feeds back the last byte sequence number of the downlink data that receives to Access Network by reverse data channel with the ACK mode.
Can be defined as during the virtual soft here and change back one period moment from DSC and play time period till DRC changes back a period of time, need to cover DRC a period of time before and after changing during this virtual soft, make access terminal can the up-to-date transmission in feedback sources base station the data byte sequence number.
Because the ACK instruction is comparatively brief, so during virtual soft, can when oppositely sending normal reverse traffic data, send the ACK instruction.
Step 4, at t2 constantly, accessing terminal changes the cell ID in the DRC channel into B from A.
After A awares the base station cell ID in the DRC channel and changes, stop to data sending of access terminal.And after the B base station awared cell ID in the DRC channel and change, beginning was to data sending of access terminal, and these data add 1 from up-to-date last byte sequence number.In other words, suppose that up-to-date last byte sequence number is y, the B base station is a starting point with y+1 so, to data sending of access terminal.Further, the B base station can also abandon sequence number in the data queue and is the data from x+1 to y.
In addition, in step 2 also can not be with x+1 be starting point to B base station padding data, but other is less than the predetermined value x+m of y+1.Since change to the time that DRC changes middle nearly 100ms according to the agreement regulation from DSC, thus can rule of thumb set in advance m, and make x+m less than y+1.
Further, in step 3, accessing terminal also can not be constantly to feed back last byte sequence number, but sends last byte sequence number before changing DRC, can reduce the ACK instruction like this, reduces the burden of system.
In the first embodiment of the present invention, the last byte sequence number that accesses terminal and access terminal and received to the Access Network feedback by modes such as ACK.In the second embodiment of the present invention, mainly utilize the NAK signaling mechanism in the existing protocol to feed back the byte serial number information to Access Network.
The soft switching process of second embodiment of the invention is as follows:
Step 101, Access Network by the A base station to the transmission business datum that accesses terminal, the SINR of all base stations in the continuous measurement Active Set of accessing terminal.Cell ID among backward channel DRC and the DSC all is A at this moment.
Step 102, when at t1 constantly, the SINR that measures the B base station of accessing terminal is during greater than the SINR of A base station, and accessing terminal changes the cell ID in the DSC channel into B from A.
After A awared the base station cell ID in the DSC channel and changes, notice ANC sent the downlink data formation to the B base station.Suppose that the sequence number that current A base station has sent data is x, ANC is starting point with x+1 so, fills the downlink data formation to the B base station.
Step 103, before DRC changes, when the A base station sends last data, sends one with the discontinuous data of data of transmission before this.For instance, after the A base station predicts the data that send sequence number to y, DRC will change, the A base station does not send sequence number and is the data of y so, but the data that to send a sequence number be y+n, here n is a natural number, and the so last sequence number that sends is that y+n data and previous sequence number are that the data of y-1 are discontinuous.
Step 104, access terminal after receiving the data that sequence number is y-1, receive the data that sequence number is y+n, because the data that receive are discontinuous, according to existing NAK mechanism, accessing terminal sends a NAK instruction to Access Network, comprising the data sequence number y that should receive, and the byte sequence number of the continuous data expected of promptly accessing terminal.
Simultaneously, access terminal and change the cell ID in the DRC channel into B from A.
Step 105 after A awares the base station cell ID in the DRC channel and changes, stops to data sending of access terminal.
And after the B base station awares cell ID in the DRC channel and change, instruct in conjunction with receiving from the NAK that accesses terminal, carry data sequence number y in this instruction, so the B base station is starting point with y, to data sending of access terminal.Further, the B base station can also abandon sequence number in the data queue and is the data from x+1 to y-1.
In addition, similar to the step 2 among first embodiment, in the step 102 also can not be with x+1 be starting point to B base station padding data, but other is less than the predetermined value x+m of y.Since change to the time that DRC changes middle nearly 100ms according to the agreement regulation from DSC, thus can rule of thumb set in advance m, and make x+m less than y.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of method of virtual soft is characterized in that, this method may further comprise the steps:
A. access terminal the Signal Interference and Noise Ratio SINR that measures the target BS sub-district greater than the SINR of source base station sub-district, change the cell ID in first backward channel into the target BS sub-district from the source base station sub-district;
B. access network controller is filled downlink data to target BS;
C. access terminal by the 3rd backward channel feedback byte serial number information corresponding, and change the cell ID in second backward channel into the target BS sub-district from the source base station sub-district with the last received data that access terminal;
D. source base station stops to data sending of access terminal; Target BS will utilize the formation of described byte serial number information established data to send to described accessing terminal.
2, method according to claim 1 is characterized in that,
Byte serial number information corresponding with the last received data that access terminal described in the step C is: the last byte sequence number of the last received data that access terminal;
Utilize the formation of described byte serial number information established data to be among the step D: the Next Sequence with the last byte sequence number of the described last received data that access terminal is the data of starting point.
3, method according to claim 2 is characterized in that,
Further comprise before the C after the steps A: access terminal and constantly feed back the last byte sequence number of current last received data by the 3rd backward channel.
4, method according to claim 1 is characterized in that,
Byte serial number information corresponding with the last received data that access terminal described in the step C is: the byte sequence number of the continuous data expected of accessing terminal;
Utilize the formation of described byte serial number information established data to be among the step D: the byte sequence number with the described continuous data expected of accessing terminal is the data of starting point.
5, method according to claim 4 is characterized in that,
Before the step C, and further comprise when source base station is determined to send last data: source base station sends discontinuous data to accessing terminal;
Among the step C, access terminal receive these discontinuous data after, the byte sequence number of the continuous data of being expected by the 3rd backward channel feedback.
According to any one described method in the claim 1～5, it is characterized in that 6, described first backward channel is a data source control DSC channel.
According to any one described method in the claim 1～5, it is characterized in that 7, described second backward channel is a data rate control DRC channel.
According to any one described method in the claim 1～5, it is characterized in that 8, described the 3rd backward channel is a reverse data channel.
9, according to claim 2 or 3 described methods, it is characterized in that, access terminal and feed back the last byte sequence number of the last received data that access terminal by the affirmative acknowledgement (ACK) ACK signaling in the 3rd backward channel.
10, according to claim 4 or 5 described methods, it is characterized in that, access terminal by the access terminal byte sequence number of the continuous data expected of the negative acknowledge NAK signaling in the 3rd backward channel feedback.
11, according to any one described method in the claim 1～5, it is characterized in that, further comprise among the step D: target BS empties the data except that utilizing the formation of described byte serial number information established data.
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| US10448291B2 (en) | 2015-04-16 | 2019-10-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for facilitating mobility in a communications network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8842631B2 (en) * | 2005-11-30 | 2014-09-23 | Qualcomm Incorporated | Data state transition during handoff |
| US9294979B2 (en) | 2012-04-17 | 2016-03-22 | Telefonaktiebolaget L M Ericsson (Publ) | Interference suppression in a wireless communication network |
| CN104105183A (en) * | 2013-04-03 | 2014-10-15 | 华为技术有限公司 | Downlink transmission power control method, device and system |
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| US20020167921A1 (en) * | 2001-03-22 | 2002-11-14 | Faramak Vakil | Method and apparatus for providing soft hand-off in IP-centric wireless CDMA networks |
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