CN100426799C - Access hard switchover method and system of high speed downlink packet - Google Patents
Access hard switchover method and system of high speed downlink packet Download PDFInfo
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- CN100426799C CN100426799C CNB2006100582474A CN200610058247A CN100426799C CN 100426799 C CN100426799 C CN 100426799C CN B2006100582474 A CNB2006100582474 A CN B2006100582474A CN 200610058247 A CN200610058247 A CN 200610058247A CN 100426799 C CN100426799 C CN 100426799C
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Abstract
The present invention provides a method and a system for the access hard switching of a high speed downlink packet. In the present invention, backuped corresponding HS-DSCH data is sent to a base station of a target subzone according to the data information which is deleted in the base station of a source subzone by that RNC carries out backuping to the HS-DSCH data of each service of a UE when a UE is about to carry out the access hard switching of the high speed downlink packet. For an AM service, the present invention can avoid the retransmission process of an RLC layer, and in addition, the present invention further avoids the invalid retransmission process that the UE detects data loss and continuously sends retransmission requests and RLC continuously sends retransmission data to the base station of the target subzone. The present invention also avoids the phenomenon of large delay at the time of data transmission because of the retransmission of the RLC layer in the AM service; for UM and TM services, the RLC directly sends the data which is deleted in the source base station subzone to the base station of the target subzone, the phenomena of data loss, etc. is avoided, and accordingly, the present invention realizes the purposes of saved network resource, enhanced data transmission rate and enhanced user satisfaction degree.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to a kind of high-speed downstream bag access hard switchover method and system.
Background technology
WCDMA (Wideband Code Division Multiple Access, the Wideband Code Division Multiple Access (WCDMA) access) technology protocol version the earliest is Release99, in this version, the carrying of uplink and downlink business all is based on dedicated channel, and the message transmission rate of uplink and downlink all can reach 384Kbps.
Because the user is more and more higher to the demand of message transmission rate, the WCDMA standard formulation is organized and has been released down high-speed data bag access technology and up-high speed data packet access technique subsequently successively, these two kinds of access technologies can provide the peak rate up to 14.4Mbps and 5.76Mbps respectively, and spectrum efficiency has also obtained very big raising.
HSDPA (High Speed Downlink Packet Access, the high-speed downstream bag inserts) as high-speed down link data packet access technique, in the version that was incorporated into 3GPP Release5 in 2002, the main feature of HSDPA system comprises: the short frame that adopts 2ms, adopt HARQ (Hybrid AutomaticRepeat Request in physical layer, physical layer mixed self-adapting repeat requests) and AMC (Adaptive Modulation and Coding) technology, introduce 16QAM (hexadecimal quadrature amplitude modulation(PAM)) high order modulation and improve the availability of frequency spectrum, realize the shared channel scheduling of each UE (subscriber equipment) by sign indicating number branch and time-division.HARQ technology has wherein adopted SAW (stopping etc.) agreement, require the base station after sending data to UE, need obtain UE feeding back ACK/NACK (answer signal/wrong responses signal), the base station can know by ACK/NACK whether UE correctly receives data, thereby determine and still to send new data to the UE data retransmission to UE.HSDPA has increased by two physical channels descending, and one is HS-SCCH (High Speed Shared ControlChannel, High-Speed Shared Control Channel), is used to carry the required signaling of demodulation companion data channel HS-PDSCH; Another is HS-PDSCH (High Speed Physical Downlink Shared Channel, a high-speed physical downlink shared channel (HS-PDSCH)), is used to carry user's data information.HSDPA is at a up physical channel HS-DPCCH (the high speed-dedicated physical control channel that increased, High-Speed Dedicated Physical Control Channel), whether the downlink data frame HS-PDSCH that this channel is used to carry user feedback receives correct information is ACK/NACK, perhaps is used to carry CQI (channel quality indication (CQI) information).Simultaneously, the HSDPA system has also increased the Flow Control that the MAC-hs entity is supported HSDPA at the MAC layer, carries out fast dispatch/priority management, HARQ and TFRI (Transport Format and Resource Indicator, transformat and resource indication) and selects.MAC-hs is positioned under the MAC-d, on the physical layer.
HSUPA (High Speed Uplink Packet Access, the high speed uplink bag inserts) is as the high speed uplink data packet access technique, in the version that was incorporated into 3GPP Release6 in 2004.The main feature of HSUPA system comprises: adopt short frame of 2ms or 10ms frame, adopt the HARQ technology in physical layer, and adopt the fast dispatch technology at place, up base station, improved up spectrum efficiency.
In wireless communication system, because the user has mobility, so wireless communication system will be supported the switching of user between different base stations.In the WCDMA system, a key technology of introducing is exactly a soft handover, the implementation procedure of soft handover is: the CPICH of UE measure neighbor cells (Common Pilot Channel, public pilot channel) Ec/I0, UE sets up and safeguards a DCH (DedicatedChannel according to measurement result, dedicated channel) Active Set, UE are kept soft handover with the sub-district in the DCH Active Set and are connected, and keep transfer of data.Sub-district in the DCH Active Set can belong to same base station, also can belong to different base station.
Can only carry out the direct-cut operation of different base station minizone compares with GSM (global system for mobile communications) in the second generation mobile communcations system, soft handover has improved the data smoothing transmission of user in the different base station minizone, make that professional service quality is relatively good, and be not easy to cause loss of data.But in the transfer of data of HSDPA, HSDPA is a DSCH Downlink Shared Channel, and can only there be the HSDPA link in UE with a sub-district a moment, and this sub-district is called the HSDPA Serving cell.
Usually, the HSDPA Serving cell of UE is the best cell with HSDPA bearing capacity.Like this, when the best cell of UE changes, just may stride the HSDPA direct-cut operation of base station.
When the HSDPA direct-cut operation, RNC sends radio link reconfiguration can for base station, Target cell place and prepare message, and sends Radio Resource control physical channel reconfiguration message to UE, at this moment, begins to carry out the HSDPA direct-cut operation.In carrying out the HSDPA direct-cut operation, user's MAC-hs in the base station, place, reset source sub-district just with all data in buffer deletions of this user in the base station, comprises MAC-hs PDU in the data of deletion.
Behind the HSDPA direct-cut operation, target cell base station is this user's a new data to the MAC-d PDU of RNC request, and the user data that is buffered in source cell base station before the HSDPA direct-cut operation is deleted, and the data that are placed among the HARQ buffer are also deleted.The data of this part deletion can not be recovered by the base station, can only retransmit by high level to recover.That is to say, for the business that possesses high-rise retransmission mechanism, when rlc layer can not obtain UE to the affirmation of this part data of source cell base station deletion, will start rlc layer and retransmit these deleted data by target BS, but, for the business that does not possess high-rise retransmission mechanism, these deleted data just can not have been recovered.
From above-mentioned to the description of HSDPA direct-cut operation as can be seen, for AM (Acknowledge Mode, affirmation mode) RLC (Radio Link Control, Radio Link control) transmission mode, the data deletion can cause a large amount of rlc layer data re-transmission, make the user when the direct-cut operation of minizone, data transmission delay is big.When the data of source cell base station deletion for a long time, receiving terminal UE can constantly send repeat requests, thereby makes RLC send data retransmission a large amount of, that content repeats to target cell base station, causes invalid re-transmission.
For the rlc layer transmission mode of UM (Un-acknowledge Mode, Unacknowledged Mode) and TM (Transparent Mode transparent mode), the data deletion can cause data to abandon and can't recover, and makes the user poor to the impression of business.
At LTE (Long Term Evolution, Long Term Evolution) in, if E-NodeB can not provide good interconnected performance between (enhancing base station), be that user data between different base station can not directly pass mutually, then when the DSCH Downlink Shared Channel direct-cut operation takes place, still need the data forwarding that do not send among the cell-of-origin E-NodeB of upper layer node of E-NodeB to give the E-NodeB of ownership goal sub-district with the user, otherwise, just can not realize can't harm direct-cut operation.Because the user rate of supporting among the LTE will be higher, may cause more multidata losing, therefore, in LTE, also exist because the upper layer data that the data deletion causes retransmits, data transmission delay reaches the problems such as impression difference of user to business greatly.
Summary of the invention
The objective of the invention is to, a kind of high-speed downstream bag access hard switchover method and system are provided, by RNC is backed up user data, avoided the rlc layer of the AM business that source cell base station causes owing to deleted data to retransmit, data transmission delay is big and the loss of data phenomenon of UM, TM business, realized conserve network resources, improve message transmission rate, improve the purpose of user satisfaction.
For achieving the above object, a kind of high-speed downstream bag access hard switchover method provided by the invention comprises:
A, carry out before the high-speed downstream bag inserts the HSDPA direct-cut operation at user equipment (UE), radio network controller (RNC) begins the high speed downlink shared channel HS-DSCH data of this UE are backed up;
B, source cell base station will owing to the HSDPA direct-cut operation of this UE fail to send and the message transmission of data that needs deletion to RNC;
C, RNC be according to the source cell base station signal transmitted, and the corresponding HS-DSCH data of its backup are sent to target cell base station.
Described step a comprises:
A1, after UE is in soft handover area, RNC begins the HS-DSCH data of this UE are backed up; Or
A2, when UE detects its best cell and suboptimum sub-district and satisfies predetermined condition, notice RNC, RNC begins the HS-DSCH data of this UE are backed up according to this notice.
Described predetermined condition comprises: the Ec/N0 difference of the Primary Common Pilot Channel of best cell and suboptimum sub-district/auxiliary Common Pilot Channel P-CPICH/S-CPICH is lower than predetermined threshold and this difference continues to reduce.
During described step a also comprises the steps any one:
When UE left soft handover area, RNC stopped the HS-DSCH data of this UE are backed up;
When UE finished the HSDPA direct-cut operation, RNC stopped the HS-DSCH data of this UE are backed up.
RNC begins the step that the HS-DSCH data to this UE back up and comprises among the described step a:
A3, RNC are that ongoing each business of UE all is provided with the corresponding cache zone;
A4, RNC send it to each professional HS-DSCH data corresponding stored of this UE of source cell base station in the corresponding cache region territory.
Described step a3 comprises:
A31, RNC obtain ongoing each the professional descending scheduling speed of UE;
A32, RNC are according to each professional descending scheduling speed and the size of determining the buffer zone that each is professional apart from the product of time of direct-cut operation; Or
Described step a3 comprises:
A33, RNC determine the professional corresponding cache degree of depth according to the return speed of RLC Status PDU, and RNC determines the size of the buffer zone that each is professional according to each professional buffer memory degree of depth and redundant coefficient.
The time of described step a32 middle distance direct-cut operation is determined according to the best cell of this UE and the pilot frequency intensity rate of change of suboptimum sub-district.
Described step b comprises:
B1, source cell base station will fail to send and need the sequence number information of the RLC PDU in the HS-DSCH data of deletion to transfer to RNC when carrying out the HSDPA direct-cut operation of UE owing to the HSDPA direct-cut operation of this UE.
Described step b1 comprises:
Source cell base station is when carrying out the HSDPA direct-cut operation of UE, with the head/sequence number information of tail RLC PDU and the continuous number of RLC PDU of RLC PDU transfer to RNC continuously in the HS-DSCH data of needs deletion;
The quantity of the described sequence number information that transfers to RNC and continuously in quantity and the HS-DSCH data that need to delete of number the quantity of the continuous segment of RLC PDU identical.
For the business of transparent mode, described step b comprises:
Source cell base station transfers to RNC with the number of the RLC PDU in the HS-DSCH data of needs deletion when carrying out the HSDPA direct-cut operation of UE.
The information that needs the data of deleting among the described step b by the order of IUB message or IUB mouth data frame transfer to RNC.
Described IUB message order comprises: the radio link reconfiguration response message.
A kind of high-speed downstream bag provided by the invention inserts the direct-cut operation system, comprise: radio network controller (RNC), source cell base station and target cell base station, it is characterized in that, be provided with backup units and Backup Data sending module among the RNC, be provided with information transmission modular in the source cell base station;
Backup units: be used for before UE carries out high-speed downstream bag access HSDPA direct-cut operation, beginning the high speed downlink shared channel HS-DSCH data of this UE are backed up;
Information transmission modular: be used for source cell base station failed to send owing to the HSDPA direct-cut operation of this UE and the message transmission of the data of needs deletion to the Backup Data sending module;
The Backup Data sending module: according to the information transmission modular signal transmitted, the corresponding HS-DSCH data that backup units is backed up are sent to target cell base station.
Described backup units comprises:
Backup notification module: be used for after UE is in soft handover area the notice backup module; When perhaps being used for P-CPICH/S-CPICH in the best cell of UE and suboptimum sub-district and satisfying predetermined condition, the notice backup module begins to carry out data backup;
The backup notification module also is used for: when UE left soft handover area or UE and finishes the HSDPA direct-cut operation, the notice backup module stopped to carry out data backup;
Backup module: be used for receive the backup notification module begin carry out the notice of data backup after, begin the high speed downlink shared channel HS-DSCH data of this UE are backed up, receive the backup notification module stop to carry out the notice of data backup after, stop the high speed downlink shared channel HS-DSCH data of this UE are backed up.
Described backup module comprises:
Cache sub-module: be used to ongoing each business of UE that the corresponding cache zone all is set;
The backup submodule: be used for receive the backup notification module begin carry out the notice of data backup after, RNC is sent to each professional HS-DSCH data corresponding stored of this UE of source cell base station in the corresponding cache region territory, receive the backup notification module stop to carry out the notice of data backup after, stop above-mentioned data backup process.
Described information transmission modular comprises: determine information submodule and transmission submodule;
Determine the information submodule: be used for the HS-DSCH data of needs deletions continuously head/the sequence number information of tail RLC PDU and the continuous number of RLC PDU of RLC PDU transfer to the transmission submodule, will transfer to the transmission submodule based on the number of RLC PDU in the HS-DSCH data transparent mode business, that need deletion;
The transmission submodule: be used for definite information submodule signal transmitted made by IUB message or IUB mouth data frame transfer to the Backup Data sending module.
Description by technique scheme as can be known, the present invention is by making RNC when UE is about to carry out high-speed downstream bag access direct-cut operation, each professional HS-DSCH data of UE are backed up, make source cell base station after the HS-DSCH data of deletion UE, do not need receiving terminal UE to send the rlc layer repeat requests, transmitting terminal RLC just can be with the respective data transfer of its backup to target cell base station, the process of having avoided rlc layer to retransmit, and further avoided because mass data is lost, receiving terminal UE detects the continuous request retransmission of loss of data, RNC constantly sends the invalid retransmit issue of the data retransmission of a large amount of contents repetitions to target BS, owing to avoided the retransmission processes of rlc layer, thereby avoided data transmission delay big, for UM, the TM business, the present invention has avoided the loss of data phenomenon; RLC among the present invention is by being provided with the buffer zone respectively and waiting to determine that according to the return speed of each professional descending scheduling speed of UE, RLC Status PDU RLC backs up the size of the buffer zone of UE business datum for each business datum, the buffer zone that RLC can be taken Backup Data easily manages; Make RLC begin the business datum of UE is backed up, stops the business datum of UE is backed up by adopting UE to be in the methods such as predetermined condition that soft handover area, best cell suboptimum sub-district satisfy, the phenomenon of having avoided RLC that the business datum of unnecessary UE is backed up; Thereby realized conserve network resources by technical scheme provided by the invention, improved message transmission rate, improved the purpose of user satisfaction.
Description of drawings
Fig. 1 is that the data format of downlink data from rlc layer to the MAC-hs entity changes schematic diagram;
Fig. 2 is that the high-speed downstream bag of the embodiment of the invention inserts direct-cut operation device schematic diagram.
Embodiment
After UE finishes the HSDPA direct-cut operation, if RNC can initiatively transfer to the data of deleting in the UE source cell base station target cell base station of UE timely, for the AM business, the rlc layer that then can avoid causing owing to the HSDPA direct-cut operation retransmits, and can reduce the data transmission delay of AM business behind the HSDPA direct-cut operation; For UM, TM business, then can avoid the loss of data that causes owing to the HSDPA direct-cut operation.
Therefore, main technical schemes of the present invention is: before UE carries out high-speed downstream bag access HSDPA direct-cut operation, radio network controller (RNC) begins the high speed downlink shared channel HS-DSCH data of this UE are backed up, source cell base station will owing to the HSDPA direct-cut operation of this UE fail to send and the message transmission of data that needs deletion to RNC, RNC is according to the source cell base station signal transmitted, and the corresponding HS-DSCH data of its backup are sent to target cell base station.
Below technical scheme provided by the invention is elaborated.
At first, the RNC among the present invention need carry out the HS-DSCH data backup for the UE that is about to carry out the HSDPA direct-cut operation.RNC can determine that UE is about to carry out the HSDPA direct-cut operation when UE is in soft handover area, and begins to carry out the HS-DSCH data backup for this UE.RNC also can determine that UE is about to carry out the HSDPA direct-cut operation, and begin to carry out the HS-DSCH data backup for this UE when predetermined condition be satisfied in the best cell of UE and suboptimum sub-district.Determine that the method that UE is about to carry out the HSDPA direct-cut operation can be provided with according to the concrete condition of real network, the present invention does not limit and determines that UE is about to carry out the method for HSDPA direct-cut operation.
Above-mentioned predetermined condition can for: the Ec/N0 difference of the P-CPICH of the best cell of UE and suboptimum sub-district continues to reduce less than predetermined threshold and this difference; Above-mentioned predetermined condition also can for: the Ec/N0 difference of the S-CPICH of the best cell of UF and suboptimum sub-district continues to reduce less than predetermined threshold and this difference.Predetermined condition among the present invention, predetermined threshold etc. can be determined according to the situation of real network.
RNC can learn whether the best cell of UE and suboptimum sub-district satisfy predetermined condition by the measurement event method of reporting that UE reports.The measurement event here can be the measurement event of redetermination, also can be existing other measurement event reports.The measurement event of redetermination can be called " descending direct-cut operation preparation incident ".When UE continues to reduce less than predetermined threshold and this difference in the Ec/N0 difference that detects P-CPICH (the Primary Common Pilot Channel)/S-CPICH of its best cell and suboptimum sub-district (auxiliary Common Pilot Channel), send " descending direct-cut operation preparation incident " measurement report to RNC.UE also can be provided with new thresholding, utilizes existing other measurement reports that the information that it measures is reported to RNC.Like this, RNC determines that UE is about to carry out the HSDPA direct-cut operation behind the measurement report that receives this measurement event correspondence, and begins to carry out the HS-DSCH data backup for this UE.
The mode of backup HS-DSCH data that RNC stores each business of this UE has multiple, and as can the buffer zone being set respectively for each professional HS-DSCH data of this UE, like this, different business datums can be stored in its corresponding cache zone.
When different business datums was stored in the different buffer zones, RNC needed to back up for each traffic assignments in advance the cache size of HS-DSCH data.
It is multiple that RNC is that each business of UE distributes the method for cache size to have in advance, mainly introduces two kinds of methods for the traffic assignments cache size of UE below.
Method one, RNC determine ongoing each the professional descending scheduling speed Ri of UE, here, RNC can determine ongoing each the professional descending scheduling speed Ri of UE according to Flow Control, and RNC also can obtain ongoing each the professional descending scheduling speed Ri of UE from the MAC-STATUS-Ind message that the transmission of MAC layer comes.RNC also needs to determine from beginning to begin to carry out time T the HSDPA direct-cut operation for the UE Backup Data to this UE, RNC can estimate according to the pilot frequency intensity rate of change of the best cell of UE and suboptimum sub-district from beginning to begin to carry out time T the HSDPA direct-cut operation, two Serving cells that the best cell of UE and suboptimum sub-district such as pilot frequency intensity are the strongest for the UE Backup Data to this UE.Like this, for each business of UE, the size of the buffer memory that business takies just can be Ri * T.Method one goes for the business of AM pattern, also goes for the business of UM and TM pattern.
Method two, for the business of AM pattern, RNC can be according to it for after certain business of UE sends pollingbit, the return speed of RLC Status PDU estimates the buffer memory depth D i of this business of UE in the base station, like this, RNC can be with cache size that should business: Di * R, wherein, R is a redundant coefficient.The redundant coefficient of service with different priority levels can be identical, also can be inequality.
According to the buffer status of current RNC, if RNC can be used for the spatial cache size K of HSDPA direct-cut operation can not ensure with
All buffer memory gets off, and then can ensure its cache size from high to low according to each service priority, till RNC available cache memory K exhausts; Wherein, M is the total number of base of RNC management, and Nj is the professional number that is about to carry out direct-cut operation among the j of base station, and Di, j are the buffer memory degree of depth of professional i among the j of base station.In this case, the redundant coefficient of service with different priority levels can be inequality, and redundant coefficient can be the cache size Di of professional actual allocated, j ' and its buffer memory depth D i, and the ratio of j, promptly
According to the buffer status of current RNC, if RNC can be used for the spatial cache size K of HSDPA direct-cut operation can ensure with
All buffer memory gets off, and in this case, the redundant coefficient of service with different priority levels can be identical, and redundant coefficient is:
Wherein, M is the total number of base of RNC management, and Ni is the professional number that is about to carry out direct-cut operation among the j of base station, and Di, j are the buffer memory degree of depth of professional i among the j of base station.
Except two kinds of methods of above-mentioned introduction, RNC can also be adopted as the methods such as buffer zone of each traffic assignments fixed size, is each traffic assignments buffer zone of UE, introduces no longer in detail at this.
At RNC be UE each traffic assignments behind the buffer zone, begin each professional HS-DSCH data of UE are carried out backup operation, promptly RNC is that each MAC-d flow data of the HS-DSCH correspondence of UE is independently stored.RNC can be when the source cell base station of UE sends data, with the storage of these transmissions in MAC-d stream corresponding cache zone.RNC can be distinguishes the transmission mode of MAC-d stream when these data of buffer memory, and promptly can not distinguish MAC-d stream be the affirmation mode business to RNC, or the Unacknowledged Mode business.
RNC need stop on certain opportunity the HS-DSCH data are backed up after beginning each professional HS-DSCH data of UE are backed up.When RNC when UE is in soft handover area and begins to carry out the HS-DSCH data backup, RNC stop opportunity that the HS-DSCH data are backed up can for: UE leaves soft handover area; When RNC satisfies predetermined condition in the best cell of UE and suboptimum sub-district and begins to carry out the HS-DSCH data backup, RNC stop opportunity that the HS-DSCH data are backed up can for: UE finishes the HS-DSCH direct-cut operation.
Certainly, when RNC when UE is in soft handover area and begins to carry out the HS-DSCH data backup, RNC stop opportunity that the HS-DSCH data are backed up also can for: UE finishes the HS-DSCH direct-cut operation.Equally, when RNC satisfies predetermined condition in the best cell of UE and suboptimum sub-district and begins to carry out the HS-DSCH data backup, RNC stop opportunity that the HS-DSCH data are backed up also can for: UE leaves soft handover area.
RNC had carried out backup to the HS-DSCH data of UE after, RNC should be sent to the target cell base station of UE with carry out HS-DSCH data that the HS-DSCH direct-cut operation makes the source cell base station of UE fail to send and delete owing to this UE.Know the message that RNC need report from the source cell base station of UE which HS-DSCH data is source cell base station deleted.
Source cell base station can be after receiving radio link reconfiguration message, by Iub mouth message or Iub mouth Frame come to RNC illustrate that being stored in of this UE is source cell base station, that also send to UE, the information of the HS-DSCH data of having deleted.
Source cell base station can be sent failing and the SN of the RLC PDU that deleted is notified to RNC, so that RNC can determine which HS-DSCH data of its backup need be sent to the target cell base station of UE.
The data format of downlink data from rlc layer to the MAC-hs entity changes as shown in Figure 1.
Among Fig. 1, high level data arrives after the rlc layer, is called as RLC SDU or SDU, and RLC SDU cuts apart at rlc layer/form RLC PDU after the cascade.Include sequence number SN among the RLC PDU, sequence number SN can RLCPDU of unique identification.RLC PDU during through the MAC-d entity, is coupled with the MAC-d head at the MAC layer, forms MAC-d PDU, when MAC-d PDU passes through the MAC-hs entity again, is coupled with the MAC-hs head, forms MAC-hs PDU.As can be known from Fig. 1, source cell base station can obtain the SN of RLCPDU from MAC-d PDU or MAC-hs PDU.
Source cell base station can fail it to send and the sequence number SN of each RLC PDU of having deleted transfers to RNC.In order to save wireless transmission resources, source cell base station also can adopt following two kinds of methods that the sequence number SN of each RLC PDU of its deletion is sent to RNC.
Method one, for the business that adopts AM transmission mode or UM transmission mode, when all the RLC PDU in the HS-DSCH data that source cell base station need be deleted are when having the RLC PDU of continuous SN, the number of the SN of the RLC PDU that source cell base station can not send first and the RLC PDU that does not send out sends to RNC; The number of the SN of the RLC PDU that source cell base station also can not send last and the RLCPDU that does not send out sends to RNC.
Method two, for the business that adopts AM transmission mode or UM transmission mode, when all the RLC PDU in the HS-DSCH data that source cell base station need be deleted are when having the RLC PDU of the continuous SN of multistage, source cell base station can with among the RLC PDU of each continuous segment first/SN of last RLC PDU that does not send and this continuous segment in the number of RLC PDU send to RNC, if the number of the SN of a continuous segment and RLC PDU is one group of data, source cell base station need send the number of many group SN and RLC PDU to RNC.
When the HS-DSCH data of source cell base station deletion were the business datum of TM (Transparent Mode, transparent mode) transmission mode, source cell base station can send to RNC with the number of all the RLC PDU in the HS-DSCH data of needs deletion.
Source cell base station can be by Iub message order as the radio link reconfiguration response message etc., and the number of SN and RLC PDU is sent to RNC.Certainly, source cell base station also can adopt other message, and the number of SN and RLC PDU is sent to RNC.
In the above-described embodiments, for the business that adopts AM transmission mode or UM transmission mode, the information of the data that the present invention need delete shows as the number of SN and RLC PDU, and for the business that adopts the TM transmission mode, the information of the data that the present invention need delete shows as the number of RLC PDU.The present invention does not limit the form of expression of the information that needs deleted data that transfers to RNC, does not limit the message transmission that the needs deleted data mode to RNC, as long as make RNC can learn which data is source cell base station deleted yet.
Be example to transmit the information that needs deleted data by the radio link reconfiguration response message below, the message transmission that will need deleted data to source cell base station to the process of RNC describes.
In RADIO LINK RECONFIGURATION RESPONSE (radio link reconfiguration response) message, include " HS-DSCH FDD Information ReSponse (the mode of frequency division duplexing message response of high speed descending sharing channel) " IE (information element, message content), it is as shown in table 1 to carry the data that each MAC-d that source cell base station transmit, that deleted flows in " HS-DSCHFDD Information Response " IE.
Table 1
In the table 1, italics represents that partly source cell base station needs the information of deleted data, wherein, LENGTH represent source cell base station in the RNC feedack, have what the section, just have what the group (SNi, Li); Wherein, SNi represents that deleted data promptly is not sent to the sequence number of the data of UE, and Li represents that SNi is not sent to the number of the continuous RLC PDU of UE afterwards.
In the present invention, the data that are not sent to UE comprise that physical layer do not transmit correct data.
Which data need be sent to target cell base station in the HS-DSCH data of RNC definite its backup from the information that source cell base station is sent, as according to (SNi, Li) and LENGTH determine which data need be sent to target cell base station in the HS-DSCH data of its backup.RNC reads the data that need be sent to target cell base station from the HS-DSCH data of its backup, and directly is sent to target cell base station.
RNC is after the HS-DSCH data that send its backup to target cell base station, data in the buffer zone are emptied, determine whether keeping this buffer zone according to " RNC stops the opportunity of HS-DSCH data backup " described in the foregoing description again, when being sent to target cell base station as finish data that HS-DSCH direct-cut operation and RNC be sent to the needs of its backup target cell base station at UE, RNC empties the data in the buffer zone, and no longer keeps this buffer zone.
High-speed downstream bag provided by the invention inserts the direct-cut operation system, comprising: radio network controller (RNC), source cell base station and target cell base station, be provided with backup units and Backup Data sending module among the RNC, and be provided with information transmission modular in the source cell base station.
Backup units is mainly used in: before UE carries out high-speed downstream bag access HSDPA direct-cut operation, begin the high speed downlink shared channel HS-DSCH data of this UE are backed up.Backup units can begin the high speed downlink shared channel HS-DSCH data of this UE are backed up when UE is in soft handover area, also can begin to carry out the HS-DSCH data backup for this UE when predetermined condition is satisfied in the best cell of UE and suboptimum sub-district.Backup units can be each professional HS-DSCH data allocations corresponding cache region territory of UE in advance.
Backup units is made up of backup notification module and backup module.
The backup notification module is mainly used in: the notice backup module begins each business of UE is carried out data backup.As backing up notification module after UE is in soft handover area, the notice backup module begins each business of UE is carried out data backup; When the information in the measurement report that notification module reports according to UE of backing up for another example determined that the P-CPICH of the best cell of UE and suboptimum sub-district or S-CPICH satisfy predetermined condition, the notice backup module began each business of UE is carried out data backup; Be specifically as follows: when the backup notification module continued to reduce less than predetermined threshold and this difference in the Ec/N0 difference of the P-CPICH of the best cell of UE and suboptimum sub-district or S-CPICH, the notice backup module began each business of UE is carried out data backup.
The backup notification module also should be when not needing each business datum to UE to back up, and the notice backup module stops backup, when definite UE leaves soft handover area, notifies backup module to stop backup procedure to each business datum of this UE as the backup notification module; Back up notification module for another example when definite UE finishes the HS-DSCH direct-cut operation, the notice backup module stops the backup procedure to each business datum of this UE.Concrete as the description in the above-mentioned method.
Backup module is mainly used in: after the notice that receives the backup notification module, begin the high speed downlink shared channel HS-DSCH data of this UE are backed up.Backup module need distribute the buffer zone respectively for each business datum before the HS-DSCH data to UE back up.Backup module is made up of cache sub-module and backup submodule.
Cache sub-module is mainly used in to ongoing each business of UE the corresponding cache zone all is set.Cache sub-module can be according to ongoing each the professional descending scheduling speed Ri of UE, and this UE begins to carry out the size that time T between the HSDPA direct-cut operation is determined professional corresponding cache zone.Cache sub-module also can be according to after sending polling bit, and the return speed of RLC Status PDU and redundant coefficient are determined the size in professional corresponding cache zone.Cache sub-module stopping of receiving that backup notification module transmission comes each business of UE is carried out the notice of data backup and Backup Data sending module with the buffer zone in data that back up, that need be sent to target cell base station when being sent to target cell base station, cache sub-module empties the data in the buffer zone, and no longer keeps this buffer zone.Concrete as the description in the above-mentioned method.
The backup submodule be mainly used in receive the backup notification module begin each business of UE carried out the notice of data backup after, RNC is sent to each professional HS-DSCH data corresponding stored of this UE of source cell base station in the corresponding cache region territory, and receive the backup notification module stop each business of UE carried out the notice of data backup after, stop each business datum of UE is backed up.Concrete as the description in the above-mentioned method.
Information transmission modular is mainly used in: with the message transmission of data of failing to send owing to the HSDPA direct-cut operation of this UE in the source cell base station and needing deletion to the Backup Data sending module, can be as information transmission modular with the SN message transmission of the RLC PDU that do not send, need deletion to the Backup Data sending module.
Information transmission modular is made up of definite information submodule and transmission submodule.
Determine that the information submodule is mainly used in: the head/sequence number information of tail RLC PDU and the continuous number of RLC PDU of RLC PDU transfer to the transmission submodule continuously in the HS-DSCH data that will need to delete, as business for employing AM transmission mode or UM transmission mode, when all the RLC PDU in the HS-DSCH data that source cell base station need be deleted are when having the RLC PDU of the continuous SN of multistage, determine the information submodule can with among the RLC PDU of each continuous segment first/SN of last RLC PDU that does not send and this continuous segment in the number of RLC PDU send to RNC; For another example for the transparent mode business, determine that the number of all RLCPDU in the HS-DSCH data that the information submodule will need to delete transfers to the transmission submodule.Concrete as the description in the above-mentioned method.
The transmission submodule is mainly used in: will determine that information submodule signal transmitted transfers to the Backup Data sending module by the signaling of IUB mouth, as transmit signaling such as radio link reconfiguration response message or the Iub mouth Frame of submodule by the Iub mouth, the number of SN and RLC PDU is sent to RNC.Concrete as the description in the above-mentioned method.
The Backup Data sending module is mainly used in: according to transmitting the submodule signal transmitted as basis (SNi, Li) and LENGTH determine which data need be sent to target cell base station in the HS-DSCH data of backup submodule backup, the Backup Data sending module reads the data that need be sent to target cell base station from the HS-DSCH data of above-mentioned backup, and directly is sent to target cell base station.Concrete as the description in the above-mentioned method.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (16)
1, a kind of high-speed downstream bag access hard switchover method is characterized in that described method comprises step:
A, carry out before the high-speed downstream bag inserts the HSDPA direct-cut operation at user equipment (UE), radio network controller (RNC) begins the high speed downlink shared channel HS-DSCH data of this UE are backed up;
B, source cell base station will owing to the HSDPA direct-cut operation of this UE fail to send and the message transmission of data that needs deletion to RNC;
C, RNC be according to the source cell base station signal transmitted, and the corresponding HS-DSCH data of its backup are sent to target cell base station.
2, a kind of high-speed downstream bag access hard switchover method as claimed in claim 1 is characterized in that described step a comprises:
A1, after UE is in soft handover area, RNC begins the HS-DSCH data of this UE are backed up; Or
A2, when UE detects its best cell and suboptimum sub-district and satisfies predetermined condition, notice RNC, RNC begins the HS-DSCH data of this UE are backed up according to this notice.
3, a kind of high-speed downstream bag access hard switchover method as claimed in claim 2, it is characterized in that described predetermined condition comprises: the Ec/N0 difference of the Primary Common Pilot Channel of best cell and suboptimum sub-district/auxiliary Common Pilot Channel P-CPICH/S-CPICH is lower than predetermined threshold and this difference continues to reduce.
4, a kind of high-speed downstream bag access hard switchover method as claimed in claim 1 is characterized in that any one during described step a also comprises the steps:
When UE left soft handover area, RNC stopped the HS-DSCH data of this UE are backed up;
When UE finished the HSDPA direct-cut operation, RNC stopped the HS-DSCH data of this UE are backed up.
As claim 1 or 2 or 3 or 4 described a kind of high-speed downstream bag access hard switchover methods, it is characterized in that 5, RNC begins the step that the HS-DSCH data to this UE back up and comprises among the described step a:
A3, RNC are that ongoing each business of UE all is provided with the corresponding cache zone;
A4, RNC send it to each professional HS-DSCH data corresponding stored of this UE of source cell base station in the corresponding cache region territory.
6, a kind of high-speed downstream bag access hard switchover method as claimed in claim 5 is characterized in that:
Described step a3 comprises:
A31, RNC obtain ongoing each the professional descending scheduling speed of UE;
A32, RNC are according to each professional descending scheduling speed and the size of determining the buffer zone that each is professional apart from the product of time of direct-cut operation; Or
Described step a3 comprises:
A33, RNC determine the professional corresponding cache degree of depth according to the return speed of RLC Status PDU, and RNC determines the size of the buffer zone that each is professional according to each professional buffer memory degree of depth and redundant coefficient.
7, a kind of high-speed downstream bag access hard switchover method as claimed in claim 6 is characterized in that, the time of described step a32 middle distance direct-cut operation is determined according to the best cell of this UE and the pilot frequency intensity rate of change of suboptimum sub-district.
8, a kind of high-speed downstream bag access hard switchover method as claimed in claim 1 is characterized in that described step b comprises:
B1, source cell base station will fail to send and need the sequence number information of the RLC PDU in the HS-DSCH data of deletion to transfer to RNC when carrying out the HSDPA direct-cut operation of UE owing to the HSDPA direct-cut operation of this UE.
9, a kind of high-speed downstream bag access hard switchover method as claimed in claim 8 is characterized in that described step b1 comprises:
Source cell base station is when carrying out the HSDPA direct-cut operation of UE, with the head/sequence number information of tail RLC PDU and the continuous number of RLC PDU of RLC PDU transfer to RNC continuously in the HS-DSCH data of needs deletion;
The quantity of the described sequence number information that transfers to RNC and continuously in quantity and the HS-DSCH data that need to delete of number the quantity of the continuous segment of RLC PDU identical.
10, a kind of high-speed downstream bag access hard switchover method as claimed in claim 1 is characterized in that for the business of transparent mode, described step b comprises:
Source cell base station transfers to RNC with the number of the RLC PDU in the HS-DSCH data of needs deletion when carrying out the HSDPA direct-cut operation of UE.
11, as claim 1 or 2 or 3 or 4 or 8 or 9 or 10 described a kind of high-speed downstream bag access hard switchover methods, it is characterized in that, the information that needs the data of deleting among the described step b by the order of IUB message or IUB mouth data frame transfer to RNC.
12, a kind of high-speed downstream bag access hard switchover method as claimed in claim 11 is characterized in that, described IUB message order comprises: the radio link reconfiguration response message.
13, a kind of high-speed downstream bag inserts the direct-cut operation system, comprise: radio network controller (RNC), source cell base station and target cell base station, it is characterized in that, be provided with backup units and Backup Data sending module among the RNC, be provided with information transmission modular in the source cell base station;
Backup units: be used for before UE carries out high-speed downstream bag access HSDPA direct-cut operation, beginning the high speed downlink shared channel HS-DSCH data of this UE are backed up;
Information transmission modular: be used for source cell base station failed to send owing to the HSDPA direct-cut operation of this UE and the message transmission of the data of needs deletion to the Backup Data sending module;
The Backup Data sending module: according to the information transmission modular signal transmitted, the corresponding HS-DSCH data that backup units is backed up are sent to target cell base station.
14, a kind of high-speed downstream bag as claimed in claim 13 inserts the direct-cut operation system, it is characterized in that described backup units comprises:
Backup notification module: be used for after UE is in soft handover area the notice backup module; When perhaps being used for P-CPICH/S-CPICH in the best cell of UE and suboptimum sub-district and satisfying predetermined condition, the notice backup module begins to carry out data backup;
The backup notification module also is used for: when UE left soft handover area or UE and finishes the HSDPA direct-cut operation, the notice backup module stopped to carry out data backup;
Backup module: be used for receive the backup notification module begin carry out the notice of data backup after, begin the high speed downlink shared channel HS-DSCH data of this UE are backed up, receive the backup notification module stop to carry out the notice of data backup after, stop the high speed downlink shared channel HS-DSCH data of this UE are backed up.
15, a kind of high-speed downstream bag as claimed in claim 14 inserts the direct-cut operation system, it is characterized in that described backup module comprises:
Cache sub-module: be used to ongoing each business of UE that the corresponding cache zone all is set;
The backup submodule: be used for receive the backup notification module begin carry out the notice of data backup after, RNC is sent to each professional HS-DSCH data corresponding stored of this UE of source cell base station in the corresponding cache region territory, receive the backup notification module stop to carry out the notice of data backup after, stop above-mentioned data backup process.
16, insert the direct-cut operation system as claim 13 or 14 or 15 described a kind of high-speed downstream bags, it is characterized in that described information transmission modular comprises: determine information submodule and transmission submodule;
Determine the information submodule: be used for the HS-DSCH data of needs deletions continuously head/the sequence number information of tail RLC PDU and the continuous number of RLC PDU of RLC PDU transfer to the transmission submodule, will transfer to the transmission submodule based on the number of RLC PDU in the HS-DSCH data transparent mode business, that need deletion;
The transmission submodule: be used for definite information submodule signal transmitted made by IUB message or IUB mouth data frame transfer to the Backup Data sending module.
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| CN102387009B (en) * | 2010-09-02 | 2014-07-02 | 中兴通讯股份有限公司 | Uplink transmission method of radio link control layer and evolutionary node B |
| CN104349387B (en) * | 2013-08-08 | 2018-08-14 | 上海诺基亚贝尔股份有限公司 | The method and apparatus that downlink transmission is used in the system for supporting double/multi-connection |
| WO2016151463A1 (en) * | 2015-03-20 | 2016-09-29 | Telefonaktiebolaget L M Ericsson (Publ) | Terminal-specific cluster of access nodes for high frequency wireless access |
| CN108282272A (en) * | 2017-01-05 | 2018-07-13 | 中兴通讯股份有限公司 | A kind of method and device that rlc layer accurately retransmits |
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