CN102711197B - Mobile station - Google Patents
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- CN102711197B CN102711197B CN201210122459.XA CN201210122459A CN102711197B CN 102711197 B CN102711197 B CN 102711197B CN 201210122459 A CN201210122459 A CN 201210122459A CN 102711197 B CN102711197 B CN 102711197B
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Abstract
The invention provides a mobile station, which is provided with a unit, a receiving unit, a storage unit and a reordering unit, wherein the unit is used for receiving a first PDCP PDU (Packet Data Convergence Protocol Protocol Data Unit) from a mobile source base station, the receiving unit is used for receiving a second PDCP PDU from a mobile destination base station; the second PDCP PDU is generated by utilizing a sequence number transmitted to the mobile destination base station by utilizing the mobile source base station and a PDCP SDU (Packet Data Convergence Protocol Signal Distribution Unit); the storage unit is used for storing the PDCP SDU corresponding to the first PDCP PDU and the PDCP SDU corresponding to the second PDCP PDU; and the reordering unit is used for sending the stored PDCP SDUs in a numbering order according to a sequence number.
Description
The application is the application for a patent for invention (international application no of original bill Application No. 200780052592.X：PCT/
JP2007/059037, the applying date：On April 26th, 2007, denomination of invention：Base station, movement station, communication system, sending method and weight
Sort method) divisional application.
Technical field
The present invention relates to movement station.
Background technology
At present, the mobile communication system such as mobile phone has started based on the business under the third generation mode of CDMA mode, no
Cross under 3GPP (third generation partner program), launched the next generation mobile communication system with regard to more high-speed communication can be carried out
System (LTE：Long Term Evolution：Long Term Evolution) discussion (non-patent literature 1).Mention here, except transfer rate
High speed outside, cut down transmission delay be also great problem.
In order that transfer rate high speed cut down transmission delay and carried out such research, that is,：In LTE communication system
In, it is achieved that switching the High Level of (Hand Over) method compared with conventional system.In mobile communications, when movement station exists
When moving in communication, the conversion (switching) of the base station that can be communicated according to reception state.Therefore, at a high speed/low
For postponing communication, the High Level realizing switching is indispensable.In LTE communication system, with packet switching system as base
This, therefore switching (Hand Over) just becomes Hand Hand Over.In Hand Hand Over, cutting off movement station
After connection between the base station being communicated with before movement, the circuit moving between station and mobile destination base station connects
Connect.In Hand Hand Over, due to having obtained the system information of mobile destination base station before will switching over, because
This can switch in short time, but the Transmission state of user data can occur in the handover.
Therefore, in order to reduce transmission delay, particular, it is important that shortening Transmission state and preventing Transmission mistake
The disappearance of packet in journey.Once in the case of there occurs packet disappearance during breaking in the transmission, needing by dividing end to end
Group resends to be recovered, and therefore transmission delay becomes big.
In addition, in the switching of LTE communication system, by following methodological standardization, methods described is：By from moving source base
Standing, it is in the data in comprising to issue the control information of movement station and being grouped in, not from this movement to forward to mobile destination base station
Source base station is transferred to the packet of movement station, is thus joined (non-patent literature 2).
Handing-over during switching
Figure 21 is handing-over explanatory diagram during switching.In Figure 21 (A), two base stations 1a, 1b and higher level station (such as MME/
SAE gateway) 2 connections.Movement station 4 is present in cell 3a of base station 1a, is currently communicated with base station 1a.In this state
Under, such as shown in Figure 21 (B), when movement station 4 moves towards the direction of base station 1b and executes switching, movement station when entering in cell 3b
Communication base station be switched to base station 1b from base station 1a.Wherein, the base station being communicated before switching is referred to as moving source base station
(source base station), the base station being communicated after switching is referred to as mobile destination base station (target BS).
The packet receiving from higher level station 2 is saved in built-in buffer moving source base station 1a, and to movement station 4 successively
Send the packet being saved in this buffer.Therefore, when switching, there is storage and be sent to shifting in both the buffers and not yet
The packet at dynamic station.In Figure 21 (B), in both the buffers be stored with switching before receive and not to movement station send packet n-2～
N, needs after handover from mobile destination base station 1b, these packets to be sent to movement station 4.Therefore, execute in switching sequence
When, moving source base station 1a will be grouped n-2～n and forward (forwarding) to mobile destination base station 1b.By using this turn
Forwarding method, mobile destination base station 1b sends this packet to movement station 4 after the handover at once, in being grouped
Disconnected.So, will not occur to be grouped end to end to resend, be able to carry out the switching of high speed.In addition, above-mentioned n-2～n is to represent
The numbering (serial number) of order of packets.
Switching
Figure 22 is the switching explanatory diagram of LTE communication system, and Figure 23 is that the switch step being presently envisaged by LTE communication system is said
Bright figure.
Movement station 4 passes through to measure report (Measurement Report) (reception situation from base station 1 and peripheral base station
Report) notify to need to switch over HO (Hand Over) (1. measure and control) to moving source base station 1.
Moving source base station 1 determines target BS 1b (determination of 2.HO destination) according to the content measuring report, and to this
Mobile destination base station 1b sends handover request (3.HO request).Now, moving source base station 1a also sends the information (shifting of movement station
Dynamic station ID and QoS (Quality of Service：Service quality) information etc.) etc..Mobile destination base station 1b is believed according to these
Cease and to carry out Call control (4. Call control).
When mobile destination base station 1b allows to access movement station, (5.HO rings to reply handoff response to moving source base station
Should).Then, moving source base station 1a sends switching instruction (6.HO instruction) to movement station 4, and starts (packets forwarding before and after here：
Forwarding) the handing-over of data (packet).
The movement station 4 receiving switching instruction guarantees by L1/L2 signaling to keep synchronous with mobile destination base station 1b
(7. synchronization guarantees), after ensure that synchronization, sends, to mobile destination base station 1b, the report (8.HO completes) that switching completes.
Thus, mobile destination base station 1b is sent to higher level station 2 (9.HO completes) by switching the report completing.Higher level station 2
When receiving the report that switching completes, packet transmission path is switched to mobile destination base station 1b from moving source destination 1a
(10. path switching), and complete response (11.HO completes to respond) to mobile destination base station 1b reply HO.Mobile destination base
The 1b that stands completes response according to HO and notifies switching HO to complete (12. resource release) to moving source base station 1a.Afterwards, eliminate and move
Path (13. resource release) between dynamic source base station 1a and higher level station 2.
The order match control of packet
In the execution of above-mentioned switching sequence, when forwarding the packet (forwarding), in mobile destination base station 1b
In, lead to the packet that this forwarding comes to be jumped because of the packet from higher level station 2 entrance, thus leading to serial number disorderly
Disorderly.If mobile destination base station 1b is to forward packet to movement station 4 in the state of serial number disorder, movement station can not be by
Correctly it is received sequentially packet, therefore communication quality deteriorates, and result cannot realize high-quality communication after leading to before the handover.
Here, for LTE communication system, in base station and movement station, profit to keep the order being grouped with the following method
Matching.Figure 24 is the explanatory diagram of the order coupling of this packet, and mobile destination base station 1b is compared to receiving from higher level station
Packet priority transmission forwards, from moving source base station 1a, the packet of coming, and thus to keep the order matching being grouped.
In fig. 24, before the handover, be stored with moving source base station 1a packet n-5～n, the packet n- in these packets
5～n-2 is already sent to movement station 4, and is grouped n-1 and n and is not yet sent to movement station 4.Additionally, send to movement station
The un-shifted station 4 of packet n-5 and n-3 in packet is correctly received (NACK), and is grouped n-4 and n-2 and is then normally received at
Arrive (ACK).Therefore, movement station 4 is saved in being grouped n-4, n-2 in buffer BF1, and does not preserve packet n-5 and n-3.
In this condition, when a switchover occurs, moving source base station 1a forwards to mobile destination base station 1b
(forwarding) un-shifted packet n-5 and n-3 that normally receive of station 4 and not yet to movement station 4 transmission packet n-1～
N, mobile destination base station 1b stores the packets in buffer BF.Additionally, higher level station 2 is after handover to mobile destination base
The 1b that stands sends two packet m～m+1 of movement station 4 to be issued, and mobile destination base station 1b stores the packets in buffer BF
In.
When mobile destination base station 1b can be communicated with movement station 4, preferentially send from movement to movement station 4 first
Packet n-5, n-3, n-1 that source base station 1b forwarding comes～n.Then, send the packet m～m+1 receiving from higher level station 2.As figure
Shown in 25, movement station 4 is according to serial number order to dividing of receiving after packet n-4, the n-2 receiving before switching and switching
Group n-5, n-3, n-1～n, m～m+1 is rearranged, and conveys them to upper layer in order.
Above is by forward (forwarding) will be grouped n-5, n-3, n-1～n all forward (forwarding) to
The situation of mobile destination base station 1b, but also exist and only forwarded packet n-5, n-3, and the forwarding of n-1～n occurs in that delay
Situation.Figure 26 be this in the case of order of packets coupling explanatory diagram.Mobile destination base station 1b by forward come packet n-5,
The n-3 and packet m～m+1 entering from higher level station is stored in buffer BF, but preferentially sends from moving source to movement station first
Base station 1a forwards packet n-5, the n-3 of coming.Then, the forwarding in packet n-1, n of being carried out by moving source base station 1a occurs in that and prolongs
In the case of late, mobile destination base station 1b monitors whether to have passed through setting time (Waiting Time：Waiting time), work as warp
Spend the waiting time still not when moving source base station 1a forwards to be grouped n-1, n, be considered as forwarding and terminate, send and connect from higher level station
Packet m, the m+1 receiving.In addition, after forwarding terminates, even if mobile destination base station 1b receives packet from moving source base station 1a
This packet also can be abandoned by n-1, n.
Movement station 4 executes the process (reordering) packet receiving being rearranged by serial number order.As figure
Shown in 27, movement station 4 is by serial number order to the packet receiving after packet n-4, the n-2 receiving before switching and switching
N-5, n-3, m, m+1 are rearranged, and convey them to upper layer in order.
Protocol architecture
As described above, in the switching of LTE communication system, the process of reordering of packets forwarding (forwarding) and packet
It is necessary technology.Here, the relation of these functions is described in detail.
Figure 28 is the explanatory diagram representing the protocol architecture between movement station and network.Between the mobile stations and the base stations, at least
It is provided with PDCP (Packet Data Convergence Protocol：PDCP) layer, RLC (Radio
Link Control：Wireless spread-spectrum technology) layer and lower layer (MAC layer/physical layer MAC/PIIY).MME/S-GW possesses point
Group routing function etc..
The major function of each agreement is as follows.
(1)PDCP：In PDCP layer, in the header sending the upper agreement of side compression, and appended sequence number is transmitted.?
Receiving side, checks to serial number, thus to carry out the waste treatment repeating to receive.PDCP layer is not sent out again
Send.
(2)RLC：Rlc layer is that have the layer resending function, newly adds and additional sequence in the data of PDCP
Serial number in number different rlc layer, and be transmitted.For example, when receiving the data of Serial No. n from PDCP, should
Data is divided into many parts, to the serial number I (1) in each partition data respectively additional rlc layer, I (2), I (3) ..., and carries out sending out
Send.Receiving side utilizes this serial number I (), is sent to confirmation to what the normally receiving of sending side notification list registration evidence/abnormal received
Signal (Ack/Nack signal).If returning Ack signal, sending side abandons preserved data, on the other hand, if returned
Return Nack, then sending side resends preserved corresponding data.
(3) lower layer
MAC：MAC layer is that the data to rlc layer carries out being multiplexed/detached layer.That is, in sending side, the data of rlc layer is entered
Row multiplexing, as sending data, in receiving side, is separated into the receiving data of MAC layer the data of rlc layer.
PIIY：PIIY layer is the layer wirelessly carrying out data transmit-receive between user terminal 4 and base station 1, by MAC layer
Data conversion becomes wireless data, or wireless data is converted into MAC layer data.
Enter PDCP layer from upper layer (such as IP layer) first and become PDCP SDU to the data that movement station sends
(Service Data Unit：Service data unit), then it is attached header information (serial number of PDCP layer etc.) and become
PDCP PDU(Protocol Data Unit：Protocol Data Unit).
PDCP PDU is sent back to rlc layer and becomes RLC SDU, is then attached the header information (serial number of rlc layer
Deng) and become RLC PDU.RLC PDU reaches the rlc layer of movement station through the process of lower layer.In this rlc layer, remove
Header and again construct RLC SDU, then in PDCP layer, remove the header of PDCP PDU and become PDCP SDU, and be sent back to
Upper layer.
In this protocol architecture, for LTE communication system, implement packets forwarding in units of PDCP SDU, with
PDCP PDU implements to reorder for unit.Additionally, in the case of implementing to forward in units of PDCP SDU, not to PDCP
SDU is the header information such as the packet appended sequence number of unit, therefore cannot be forwarded this serial number.Therefore, with PDCP
In the case that SDU implements to forward for unit, also to forward the header information such as the serial number that add.In addition, RLC SDU with
They, therefore in this manual as long as no being particularly limited to, are just referred to as point by the substantially the same data of PDCP PDU
Group, in the case of describing the numbering of this packet, this numbering refers to the serial number of PDCP PDU.
The action of moving source base station device
Figure 29 is the action flow chart of moving source base station device during switching.
Moving source base station 1a by measure report when user terminal 4 receives received electric field strength etc. (step 101),
Judging whether to need to switch over HO (step 102), if not needing to switch over, returning to initial point.
But, when being defined as needing to switch over, moving source base station 1a determines movement according to the content measuring report
Destination base station 1b, sends handover request (step 103) to this mobile destination base station 1b.
Then, receive the handoff response (step 104) sending from mobile destination base station 1b, carry out turning of packets remaining
Send out (step 107).
Afterwards, the resource release message (step 108) sending from mobile destination base station 1b, execution resource release are received
(step 109).
The action of mobile destination base station
Figure 30 is the action flow chart of mobile destination base station during switching.
Mobile destination base station 1b is receiving HO request (comprising movement station ID and QoS information etc.) from moving source base station 1a
When (step 121), carry out Call control according to these information, determine whether access movement station (step 122).As
Fruit does not allow, then execution post processing (step 130), terminates switching control.
On the other hand, in the case of allowing to access movement station, reply HO response (step 123) to moving source base station 1a.
Then, mobile destination base station 1b will forward the packet coming to store in both the buffers (step 124) from moving source base station 1a, and
Receive the report (step 125) that HO completes from movement station 4.If receiving the report that HO completes, mobile destination base station 1b
The report that HO is completed is sent to higher level station 2 (steps 126).Higher level station 2, when receiving the report that switching completes, packet is passed
Defeated path is switched to mobile destination base station 1b from moving source base station 1a, replys HO to mobile destination base station 1b and completes to respond.
If mobile destination base station 1b receives HO from higher level station 2 and completes to respond (step 127), from by mobile destination base station 1b
Forward the packet coming to start preferentially to be sent to it movement station, after have sent this packet, send to movement station and connect from higher level station 2
Packet (the scheduling receiving：Step 128).Additionally, with step 128 concurrently, mobile destination base station 1b is to moving source base station 1a
Send resource release message (step 129), carry out post processing (step 130), terminate switching control.In addition, the tune in step 128
In the case that degree is postponed by the packets forwarding that moving source base station 1a is carried out in processing, mobile destination base station 1b monitors whether
Have passed through setting time (Waiting Time：Waiting time), when have passed through the waiting time and still not forwarding to be grouped, it is considered as
Forwarding terminates, and sends the packet receiving from higher level station, and after forwarding terminates, even if receiving point from moving source base station 1a
This packet also can be abandoned by group.
The action of movement station
Figure 31 is the action flow chart of movement station during switching.
The determination part of movement station 4 passes through to measure to be reported to (steps 151) such as moving source base station notice received electric field strengths.It
Afterwards, wait the HO instruction from moving source base station 1a, when receiving HO instruction (step 152), guaranteed by L1/L2 signaling
Keep synchronous (step 153) with mobile destination base station 1b, after ensure that synchronization, send switching to mobile destination base station 1b
The report (step 154) completing, then, movement station, when receiving packet from mobile destination base station 1b, executes the place that reorders
Reason (step 155～160).
That is, the control unit of movement station, when receiving lower layer packet from mobile destination base station 1b, constructs RLC SDU,
This RLC SDU (PDCP PDU) is given rearrangement prelude (step 155).Reset prelude and check that serial number whether there is disappearance (step
Rapid 156), if serial number does not have disappearance but continuous, this RLC SDU (PDCP PDU) are transmitted as PDCP SDU
To upper layer (step 160).On the other hand, if serial number has disappearance, control unit instruction is reset prelude and is preserved PDCP
PDU.Thus, reset prelude and preserve PDCP PDU (step 157), and check whether and receive serial number continuous RLC SDU
(PDCP PDU) (step 158).If receiving serial number continuous RLC SDU (PDCP PDU), by this RLC SDU
(PDCP PDU) passes to upper layer as PDCP SDU, and the PDCP being kept PDU is passed to upper layer (step
160).
Additionally, in step 158, if not receiving serial number continuous RLC SDU (PDCP PDU), monitoring whether
Have passed through the scheduled time (step 159), if not yet through the scheduled time, repeat step 157 and process afterwards, and if
Have already been through the scheduled time, even if then serial number is discontinuous, also the PDCP being preserved PDU is passed to upper layer (step
160).
Problem
But, when executing the packets forwarding with switching in LTE communication system, there is following problem.That is, work as execution
During switching, as described above, in LTE communication system, execution is retained in the handing-over of the moving station number evidence in moving source base station 1a, and
Produce the packets forwarding (forwarding) with handing-over.But, in above-mentioned switching control, when mobile destination base station 1b
When the value of waiting time (Waiting Time) is less, although exist not yet forwarding all packets, mobile destination base station 1b is just
Start to transmit the packet receiving from higher level station, thus abandoning the problem of the not yet packet of forwarding.On the other hand, in the waiting time
Value larger when, mobile destination base station 1b not transmitting, before the waiting time, the packet receiving from higher level station, thus
There is a problem of transmission delay.That is, it may occur that communication delay increases and throughput degradation in conventional switching control
Problem it is impossible to guarantee high-quality communication before the handover afterwards.
As the 1st prior art, there is last the dividing being forwarded from moving source base station to mobile destination base station notice
The method (with reference to non-patent literature 3) of group (Last Packet).In the case of forwarding appearance to postpone, it is informed about last
The mobile destination base station of packet can by the serial number of the packet receiving from higher level station be set to the serial number of last packet+
1 and carry out hop transmission.Additionally, mobile destination base station can will forward the serial number of the packet coming and the sequence of last packet
Row number is compared, and thus to force to terminate waiting timer (Waiting Timer) such that it is able to turn in optimal timing detection
The end sent out.But, in the case of having abandoned last packet in repeating process, mobile destination base station cannot reliably be examined
Measure last packet.
Additionally, as the 2nd prior art, there is such mobile communication system：This mobile communication system is used for just entering
When switching between the base station of row high speed packet communication, realize not occurring the HRPD of loss of data to forward (reference
Patent documentation 1).In this mobile communication system, when a switchover occurs, the base station of handover source forwards to handover destination base station
(forwarding) grouped data.But, this technology is not improved to be increased by the communication delay causing that reorders of movement station
And throughput degradation.
Additionally, as the 3rd prior art, there is such method：In mobile destination base station, it is not to wait for being forwarded
The arrival of packet, but jumpily transmit the packet (with reference to patent documentation 2) coming from the transmission of higher level station.In the method, pass through
Distinguish the packet receiving from moving source base station and the packet receiving from higher level station, be capable of the hop transmission of packet.But
It is to need in the mobile stations to arrange the function of two sequential controls, leading to it to control becomes complicated.
By upper, it is an object of the invention to, will from higher level station (e.g. different from moving source base station, to mobile mesh
Ground base station send the device of data (packet)) packet that is transferred to mobile destination base station is rapidly transmitted to movement station.
Another object of the present invention is to, even if forwarding that comes to be grouped and dividing of coming from the transmission of higher level station from moving source base station
Group mix it is also possible to by exclude from the object of sequential control this from higher level station transmission come packet, thus merely with
One sequential control function can correctly reorder to the packet forwarding.
In addition, another object of the present invention can be positioned, provide not open by prior art described in embodiment etc.
Item.Preferably, such item is to obtain item necessary to the effect that prior art cannot obtain.
Non-patent literature 1：3GPP,“Requirements for Evolved UTRA(E-UTRA)and Evolved
UTRAN(E-UTRAN),”TR25.913V7.3.0,Release 7,March 2006.
Non-patent literature 2：3GPP,“Evolved Universal Terrestrial Radio Access(E-UTRA)
and Evolved Universal Terrestrial Radio Access Network(E-UTRAN),”TS36.300,
Release8,V8.0.0,April 2007.
Non-patent literature 3：Samsung,“Method to release resources at source ENB during
handover,”R3-061032,RAN3#53,September 2006.
Patent documentation 1：Japanese Unexamined Patent Publication 2004-282652 publication
Patent documentation 2：Japanese Patent Application 2006-086537
Content of the invention
The present invention provides a kind of movement station, and it has：Receiving unit, it receives the 1PDCP forwarding from moving source base station
PDU, and receive 2PDCP PDU from mobile destination base station, wherein, described moving source base station passes through user plane to described
Mobile destination base station turns successively according to the form with header information, PDCP SDU and the serial number being additional to this PDCP SDU
Send out PDCP SDU and serial number, this 2PDCP PDU be the PDCP SDU that this is forwarded is added with the serial number that this is forwarded and
Generate, and, this receiving unit is from being used as to receive the serial number receiving from described moving source base station from higher level station
The serial number of PDCP SDU and the described mobile destination base station that is added to this PDCP SDU receives and addition of the of this serial number
3PDCP PDU；Memory element, it stores described 1PDCP PDU, described 2PDCP PDU and described 3PDCP PDU；With
And the unit that reorders, its according to this serial number, by the PDCP SDU of the PDCP being stored PDU by this serial number order to upper
Layer transmission.
Method for reordering
The method for reordering of the present invention is such method：Send to movement station from mobile destination base station and addition of expression
Information (such as number) the i.e. data (packet) of order information of order, and in the mobile stations according to this order information to data
(packet) is rearranged.
In the method for reordering of the present invention, mobile destination base station is accordingly sent out with the data sending to described movement station
Send identification information, this identification information is capable of identify that and forwards, from moving source base station, the data come and do not obtain via moving source base station
Data.Preferably, movement station distinguishes the next data of described forwarding and not via described moving source base according to this identification information
The data stood and obtain, to carry out process of reordering.Preferably, the described data not obtained via described moving source base station
It is the data being received by gateway apparatus.Preferably, the data sending to movement station to send according to block form.
The method for reordering of the present invention has steps of：Forward not to shifting to mobile destination base station from moving source base station
The data of dynamic the stand data sending or the confirmation response not obtaining normally receiving from movement station, from this mobile destination base station to this
Movement station sends this data, and sends, to movement station, the data receiving from higher level station；In mobile destination base station, jumping
Jump is transmitted in the case of the data that higher level station receives sequentially to movement station, and making this data have this data of expression is jump
The information of data is simultaneously transmitted；In the mobile stations, this hopped data is considered as reordering the data outside object, for conduct
The data of object of reordering carries out process of reordering.
Another method for reordering of the present invention has steps of：Forward to mobile destination base station from moving source base station
The data not responded to data or the confirmation not obtaining normally receiving from movement station of movement station transmission；Arrive in the 1st setting time
When before, from this mobile destination base station to movement station send from moving source base station forward come described data and and from higher level
The data that station receives, after the 1st setting time is then, abandons and forwards, from moving source base station, the packet of coming；To be used for really
The information of the last data of the object that reorders that fixed 1st setting time then receives before is added to this data, or
This information is added to another data of transmission after immediately this data, and is sent to movement station；In the mobile stations, until the 2nd
Setting time then till, carry out process of reordering, when receiving the data comprising described information, even if the 2nd set when
Between not yet then, also can terminate process of reordering.
Above-mentioned method for reordering preferably, also has steps of：In mobile destination base station, on hop sequence ground
Transmit in the case of the packet that higher level station receives to movement station, make this packet have the letter representing that this packet is jump packet
Breath；In the mobile stations, this jump packet is considered as reordering the packet outside object, enters for the packet as the object that reorders
Rearrangement sequence is processed.
Communication system
The communication system of the present invention is such communication system：Send to movement station from mobile destination base station and addition of table
Show the data (being for example grouped) of the numbering of order, and order rearranges to data by number in the mobile stations.
The communication system of the present invention has：Movement station, the moving source base station communicating with this movement station before handover and
The mobile destination base station communicating with this movement station after the handover, (1) described moving source base station has：Buffer, its preservation
The data receiving from higher level station；Data sending part, it sends, to movement station, the data being stored in this buffer；And control
Portion, it forwards, to mobile destination base station, the data not sent to movement station during switching sequence execution or does not just obtain from movement station
The data confirming response often receiving, (2) described mobile destination base station has：Buffer, it is saved in switching sequence execution
When the described data that receives from the moving source base station and data receiving from higher level station；Control unit, its be controlled so that
Preferentially send the described data receiving from moving source base station to movement station, and, hop sequence to movement station transmission from
In the case of the data that higher level station receives, making this data have this data of expression is the information of hopped data and is transmitted；
And sending part, it sends data to movement station, and (3) described movement station has：Buffer, the number that its preservation receives from base station
According to；And the control unit that reorders, its data being considered as reordering outside object by described hopped data, for right as reordering
The data of elephant carries out process of reordering.
Another communication system of the present invention has：Movement station, the moving source base station communicating with this movement station before handover,
And the mobile destination base station that communicates with this movement station after the handover, (1) described moving source base station has：Buffer, its
Preserve the data receiving from higher level station；Data sending part, it sends, to movement station, the data being stored in this buffer；And
Control unit, its to mobile destination forward switching sequence execute when not to movement station transmission data or do not obtain from movement station
The data confirming response normally receiving, (2) described mobile destination base station has：Buffer, it is saved in switching sequence and holds
The described data receiving from moving source base station during row and the data receiving from higher level station；Control unit, it is controlled, and makes
1st setting time then must be forwarded the described data come as the object data that reorders from described moving source base station before, excellent
First it is sent to movement station, and carry out such control：Receive before will being used for determining the 1st setting time then is last
The information of the data of the object that reorders be added to this data, or after this information is added to immediately this data transmission another
One data, and it is sent to movement station, and, abandon the data that the 1st setting time is then come afterwards from moving source base station forwarding；
And sending part, it sends data to movement station, and (3) described movement station has：Buffer, the number that its preservation receives from base station
According to；And the control unit that reorders, it is controlled as follows：Carry out, till the 2nd setting time is then, process of reordering, connecing
Receive the data with the information for determining the data being the last object that reorders or have for determining last rearrangement
During the data of the received information of the data of ordered pair elephant, even if the 2nd setting time is not yet then, also terminate the place that reorders
Reason.
Base station/movement station
The other modes of the present invention are to respectively constitute the 1st, base station of the 2nd communication system and respectively constitute the 1st, the 2nd communication
The movement station of system.
Brief description
Fig. 1 is the explanatory diagram of the 1st embodiment.
Fig. 2 is the form example of PDCP PDU packet.
Fig. 3 be switching before PDCP layer and rlc layer packet transaction explanatory diagram.
Fig. 4 be switching after PDCP layer and rlc layer packet transaction explanatory diagram.
Fig. 5 is the structure chart of base station.
Fig. 6 is the structure chart of movement station.
Fig. 7 is the action flow chart of the mobile destination base station of the 1st embodiment.
Fig. 8 is the flow chart of the moving source base station of the 1st embodiment.
Fig. 9 is the action flow chart of the movement station of the 1st embodiment.
Figure 10 is the handling process that reorders of movement station.
Figure 11 is the explanatory diagram of the 2nd embodiment.
Figure 12 is the form example of PDCP PDU packet.
Figure 13 be switching after PDCP layer and rlc layer packet transaction explanatory diagram (one of).
Figure 14 is the explanatory diagram (two) of the packet transaction of PDCP layer after switching and rlc layer.
Figure 15 is the action flow chart of the mobile destination base station of the 2nd embodiment.
Figure 16 is the action flow chart of the movement station of the 2nd embodiment.
Figure 17 is to attach after corresponding PDCP SDU data by the serial number of PDCP PDU and pass through datum plane (U-
Plane the example) being notified.
Figure 18 is to attach after corresponding PDCP SDU data by the serial number SN of PDCP PDU and carried out by U-Plane
Notify, pass through the example of C-plane notification sequence number simultaneously.
Figure 19 is the transfer sequence step of Figure 18.
Figure 20 is the example being completely absent the situation of PDCP SDU data to be forwarded.
Figure 21 is handing-over explanatory diagram during switching.
Figure 22 is the switching explanatory diagram of LTE communication system.
Figure 23 is contemplated at present switch step explanatory diagram in LTE communication system.
Figure 24 is the 1st explanatory diagram of the process of reordering of movement station.
Figure 25 is the 2nd explanatory diagram of the process of reordering of movement station.
Figure 26 is the 3rd explanatory diagram of the process of reordering of movement station.
Figure 27 is the 4th explanatory diagram of the process of reordering of movement station.
Figure 28 is the explanatory diagram representing the protocol architecture between movement station and network.
Figure 29 is the action flow chart of moving source base station device during switching.
Figure 30 is the action flow chart of mobile destination base station during switching.
Figure 31 is the flow chart of movement station during switching.
Specific embodiment
(A) principle of the present invention
In the present invention, it is able to carry out following two process to solve its problem by making base station and movement station.
Process 1：After handover, because the data forwarding from moving source base station there occurs delay, therefore it is not to wait for this number
According to reception and transmit (hop transmission) and stand the data that receives of machine from higher level, in this case so that movement station can be known
Not going out this data is hopped data, and executes hop transmission.That is, will be used for identifying to be that the identification information of hopped data is included in this
In data, or this identification information is attached in this data, or so that this identification information is mapped with this data, and for example
It is transmitted using control channel.
Process 2：, in the case of detecting and there occurs hop transmission, it is right not to be considered as reordering by this hopped data for movement station
As saving it in buffer, waiting the arrival forwarding the data come from moving source base station.That is, come area using identification information
Divide and forward the data come and without the data that moving source base station sends from moving source base station, rearrangement sequence of going forward side by side.
In the conventional method, occurring from moving source base station to the data forwarding (forwarding) of mobile destination base station
In the case of postponing, wait and send, to movement station, the data being transferred to mobile destination base station from higher level station.Therefore, because will
Through stipulated time (Waiting Time：Waiting time) before wait the arrival of this data, thus there is generation communication prolonging
The problem of increase and throughput degradation late.But, if as described above, carrying out the hop transmission of data, even if in data
It is also possible to the data receiving from higher level station is transferred to rapidly movement in the case of forwarding (forwarding) to postpone
Stand, thus, reduce communication delay.Therefore, compared with the conventional method, the communication matter before and after can guaranteeing in high quality to switch
Amount.
(B) the 1st embodiment
Fig. 1 is the explanatory diagram of the 1st embodiment, its explanation to the situation row carrying out additional sequence information in packetized units,
It can also be but the data of prescribed level.
It is set to before the handover, be stored with moving source base station 11a packet n-5～n, the packet n-5 in these packets～
N-2 has been sent to movement station 14, and is grouped n-1 and n and is not sent to movement station 14.For example, it is due to being grouped n-1 and n
It is just to reach after the radiolink between cut-out moving source base station 11a and movement station 14, therefore these packets n-1 and n is not
It is sent to movement station 14.Additionally, the un-shifted station 14 of packet n-5, n-3 being set in the packet sending to movement station correctly connects
Receive (NACK), and be grouped n-4, n-2 and be received normally (ACK).Therefore, movement station 14 preserves packet n-4, n-2, without
Preserve packet n-5, n-2.
In this condition, when a switchover occurs, moving source base station 11a forwards to mobile destination base station 11b
(forwarding) un-shifted station 14 packet n-5 and n-3 normally receiving and packet n-1, n of not sending.Hereinafter illustrate
In the case that packet is forwarded, but it is not limited to such example.
Additionally, higher level station 2 sends two packet m～m of movement station to be issued after handover to mobile destination base station 11b
+1.In addition, the forwarding (forwarding) setting packet n-5～n there occurs delay.
If mobile destination base station 11b from moving source base station 11a forward to be grouped before n-5, n-3, n-1～n from
Higher level station 2 receives packet m, m+1, then packet m, m+1 additional hops identification code F this being received from higher level station, and first will
They send (hop transmission) to movement station 14.
The packet that addition of jump identification code F receiving from base station is saved in buffer BF2 movement station 14, and will
They are discharged outside the object of process that reorders.(A) of Fig. 1 represents that movement station 14 preserves packet m, m in buffer BF2
+ 1, and preserve the state of packet n-4, the n-2 receiving before the handover in buffer BF1.
Then, mobile destination base station 11b to movement station send from moving source base station 11a forward come packet n-5, n-3,
N-1～n.These packets receiving from mobile destination base station 11b n-5, n-3, n-1～n is saved in caching by movement station 14
In device BF1, carry out these packets receiving after handover and the process of reordering of packet n-4, n-2 of receiving before the handover
(with reference to Fig. 1 (B)), and according to serial number order, packet is passed to upper layer.In addition, connecing not yet when have passed through the stipulated time
Receive serial number packet when, terminate to reorder process, the packet being received so far and rearranging passes to upper
Layer.
In addition, when forwarding, all packets can be forwarded it is also possible to only turn from moving source base station to mobile destination base station
Send out a part of data (user data part) comprising in packet.Preferably, to forwarding data additional sequence information.
Additionally, in FIG, serial number (order information) m, m+1 are distributed to the packet having carried out hop transmission, Bu Guoyi
Dynamic destination base station 11b can distribute arbitrary serial number, can also add and repeat with the serial number additional to the packet forwarding
Numbering, in addition it is also possible to adopt unduplicated numbering.
Jump identification code
As the example to packet additional hops identification code F, 3 bits comprising in the header employing PDCP PDU
" type " field.That is, in this " type " field by new type number definition be jump identification code F, and by this type number
It is added to the packet of hop transmission.Fig. 2 is the form example of PDCP PDU, and (A) is the form example of no header, and (B) is not add
The form example of the serial number of PDCP PDU, (C) and (D) is the form example of the serial number that addition of PDCP PDU.At (C) and (D)
Form in, type field and PID field defined in header HD, represent the classification of PDCP PDU with type field.PID word
Section is the field representing the compression classification for the data comprising in Data portion.In type field, define " type=
000 " and " type=001 ", do not specify and do not use " type=010～111 ".Thus, for example utilizing " type=010 ",
Type numbering (jump identification code) as the PDCP PDU having carried out hop transmission for identification.
PDCP layer before and after switching and the process of rlc layer
Fig. 3 be switching before PDCP layer and rlc layer packet transaction explanatory diagram.Moving source base station 11b is by PDCP layer
Packet n-5～n-2 stores in both the buffers ((A) of Fig. 3), such as shown in (B), in rlc layer, packet is divided into multiple data,
For the serial number I of the additional rlc layer of each partition data, I+1, I+2 ..., I+6, be then sent to movement station 14.Movement station 14
Carry out the sequential control for PDCP layer before the handover in rlc layer.In figure 3, it is set to movement station 14 not normally receive
Partition data I, I+4, I+5, i.e. packet n-5, n-3, but normally received packet n-4, n-2.
Fig. 4 is the explanatory diagram of the packet transaction of PDCP layer after switching and rlc layer, and particularly illustrates PDCP layer and RLC
The process state of layer.In addition, though movement station 14 is the sequential control carrying out in rlc layer before the handover for PDCP layer, but
Regulation initializes to rlc layer after handover.Therefore, PDCP layer is transferred in the process of sequential control, and movement station 14 is in PDCP
Switching sequence is executed in layer.
Movement station 14 starts intervalometer to judge the end reordered when reordering.
Because packet m, the m+1 from higher level station 2 reception takes the lead in reaching, therefore mobile destination base station 11b is to this packet m, m
+ 1 additional hops identification code F, and first transmitted (hop transmission) to movement station 14.Movement station 14 is attached by receive from base station
The packet having added jump identification code F is saved in buffer BF2, and they are excluded outside the object of process that reorders.It
Afterwards, movement station 14 receives to packet n-5, n-3, the n-1 receiving from mobile destination base station 11b～n and before handover
Packet n-4, n-2 carry out process of reordering, and pass to upper layer.
In addition, when intervalometer have passed through stipulated time TMWhen, movement station 14 terminates to reorder processs, even if packet exist scarce
Lose, remain on and the packet receiving is sent back to upper layer.
Window control
Guard against the situation of the data more than the data volume that can allow that arrived, movement station 14 internally generates buffer
The window of size, and carry out following window control when reordering and processing.In the example in fig. 4, the left end of window is initial
When expected reach numbering n-5, the right-hand member of window is the volume being determined by the data volume (window buffer size) that can allow
Number n-2.Movement station is not processed to the packet application widget that addition of jump identification code F.
Under original state (Window state (0)), go forward side by side rearrangement when movement station 14 receives expected packet (n-5)
When sequence is processed, as shown in (1), therefore, movement station forwards expected packet (n-5) to upper layer and is contiguous therewith Window state
Packet (n-4).Then, Window state is changed into the state shown in (2), is expected when movement station 14 receives in this condition
Packet (n-3) and carry out reordering process when, Window state is changed into the state shown in (3).Therefore, movement station forwards to upper layer
The packet (n-3) expected and the packet (n-2) being contiguous therewith.Then, Window state is changed into the state shown in (4), movement station
14 wait packet (n-1), the reception of n, in this condition if in setting time TMReceive packet (n-1), n, then by it
Be transmitted to upper layer.But, if in setting time TMIn a period of do not receive packet (n-1), n, then movement station 14 will
It is saved in packet m in buffer BF2 and packets forwarding afterwards to upper layer, transfer to the usual control before switching.As above
Described, by jump packet is executed above-mentioned window control with foreclosing, it is able to carry out the weight for packet n-5～packet n
Sequence is processed.
In addition, in window control, movement station 14 is receiving dividing of the serial number less than the serial number of window left end
In the case of group, abandon this packet.Additionally, movement station 14 is receiving dividing of the serial number bigger than the serial number of window right-hand member
During group, the serial number of this window right-hand member is set to the serial number of this packet, the serial number of window left end is changed to be delayed by window
The reception ejected in this window ranges packet is passed to upper layer by the numbering that storage size determines simultaneously.
If also applying window treatments to jump packet, when receiving packet m, Window state for example becomes
Window left end is n-2, and window right-hand member is m.In this case, movement station abandons the reception being grouped n-5, n-3 not yet receiving,
Received packet n-4, n-2 and be transmitted to upper layer.Then, the serial number of window right-hand member is set as m, by the sequence of window left end
Row number is set as numbering n-1 being determined by window size, wait afterwards packet n-1, packet n, packet n+1 ..., packet m-1
Arrive.But, among this, packet n+1～packet m-1 is the packet not actually existing, and therefore, has vainly waited these
The reception of packet, leads to packet transaction that problem occurs.
The structure of base station
Fig. 5 is the structure chart of base station, shows buffer unit, scheduling unit, receiving and transmitting part and control unit.
Buffer unit 21 is to forward from the packet of higher level station entrance and from adjacent base station (moving source base station) for storage
Packet memorizer.In the figure, physically it is being provided with two buffers 21a, 21b but it is also possible to adopt in physics
In structure, a memorizer is only set, carries out splitting the apparatus structure utilizing from software.
Scheduling unit 22 selects the movement station being wirelessly transferred from the multiple movement stations communicating, and taking-up is stored in slow
The packet of this base station in storage, sends back to receiving and transmitting part.Receiving and transmitting part 23 carries out encoding, modulates to the packet coming from scheduling unit transmission
Process, and carry out the data transfer of reality using wireless mode.Additionally, receiving the control signal sending from movement station and various
Data is simultaneously demodulated to it.
Control unit 24 has buffer management portion 24a, HO control unit 24b and measures control unit 24c.Buffer management portion
24a is managed to the various packets being stored in buffer 21.If the handing-over of execution data, at least will deposit in switching
Storage not obtaining in buffer 21b normally receive the packets forwarding of confirmation (ACK) to mobile destination base station 11b.The opposing party
Face, there occurs delay in the arrival leading to the packet coming from the forwarding of moving source base station 11a because data joins, thus biography of jumping
Defeated in the case of the packets that receive of higher level station 2, charge to " type=in the type field of the header of this jump packet
010”.
HO control unit 24b execution, using the switching control of Figure 23 explanation, measures control unit 24c collection and sends from movement station
Various mensure information, wireless quality CQI (Channel Quality Information) of such as movement station etc..
The structure of movement station
Fig. 6 is the structure chart of movement station, shows receiving and transmitting part 31, buffer unit 32, resets prelude 33 and control unit 34.Receive
The receiving and transmitting part of the portion of sending out 31 and base station carries out the transmitting-receiving of packet and control information.Buffer unit 32 is can not be according to the lower layer receiving
In the case that packet is to construct RLC PDU, it is saved in till can constructing this RLC PDU, when RLC PDU constructs successfully, goes
Except header, pass to rearrangement prelude 33 as RLC SDU (PDCP PDU).Reset prelude 33 to have for according to serial number order
PDCP PDU is rearranged and is passed it to the function of upper layer.Reset prelude 33 in sequence PDCP PDU is detected
When row number occurs disappearance, PDCP PDU afterwards is saved in internal memory, until receiving the continuous PDCP of serial number
Till PDU.But, have passed through in the case that this PDCP PDU of stipulated time still do not reach, resetting prelude and stop reordering
Process, all PDCP PDU being stored are passed to upper layer.Additionally, resetting prelude 33 when being reordered, carry out window
Mouth controls so that handled data volume is less than allowance.
Control unit 34 has determination part 34a, reorder management department 34b and resend management department 34c.Determination part 34a
Measure the various mensure information being sent to base station.For example, measure wireless quality CQI (the Channel Quality of movement station
Information).The 34b reorder portion of management department 33 that reorders is controlled, and is resetting the PDCP PDU that prelude 33 is preserved
In the case of there occurs numbering disappearance, instruction waits the arrival numbering continuous PDCP PDU.Additionally, work as the arrival of this packet etc.
When the time have passed through the stipulated time, instruction is reset prelude 33 and is stopped reordering, and indicates all PDCP that removal is preserved
The header of PDU, passes to upper layer as PDCP SDU, thus being in the state that can receive new PDCP PDU.Then, reorder
The maximum sequence number receiving so far is set as the serial number of window right-hand member by management department 34b, and by considering window size
To determine and to set the serial number of window left end.Here, if there is connect less than the serial number of window left end of serial number
Contracture group, then directly forward the packet to upper layer.Resend management department 34c when resending control, according to dotted line
Represented path is passed through receiving and transmitting part and is resend request signal to base station transmission.
The action of mobile destination base station
Fig. 7 is the action flow chart of the mobile destination base station of the 1st embodiment.
Switch control portion 24b of mobile destination base station 11b from moving source base station 11a receive HO request (comprise move
Dynamic station ID and QoS information etc.) when (step 201), carry out Call control according to these information, determine whether to access and move
Dynamic station (step 202).If not allowing, carrying out post processing (step 213), and terminating switching control.
On the other hand, switch control portion 24b, in the case of allowing to access movement station, replys HO to moving source base station 11a
Request response (step 203).Then, mobile destination base station 11b waits and forwards, from moving source base station 11a, the packet of coming,
Afterwards, buffer unit 21 is stored (step 204) when receiving from the packet that the forwarding of moving source base station 11a comes.
In this condition, switch control portion 24b is when movement station 14 receives the report that HO completes (step 205), to
The report (step 206) that higher level station 12 transmission HO completes.Higher level stand in receive switching complete report when, will packet transmission
Path is switched to mobile destination base station 11b from moving source base station 11a, and completes to ring to mobile destination base station 11b reply HO
Should.Switch control portion 24b of mobile destination base station 11b from higher level station 12 receive HO complete response when (step 207), to
Scheduling unit 22 instruction starts to send packet (step 208).
Thus, scheduling unit 22 checks the need for carrying out being grouped hop transmission (step 209), if it is not required, then to shifting
The preferential transmission in dynamic station 14 forwards, from moving source base station 11a, the packet (step 210) of coming.But, if being derived from moving source base station 11a
The forwarding of packet occur postponing thus needing to carry out being grouped hop transmission, then scheduling unit 22 executes and receives from higher level station 12
The hop transmission of packet.
When executing hop transmission, the classification number that will carry out the type field of the packet of hop transmission is set as 010
(type=010) movement station 14, is made to can recognize that this packet is hop transmission packet (step 211), then to movement station 14
Transmit this packet (step 210).
Process concurrently with above, switch control portion 24b sends resource release message (step to moving source base station 11a
212), execution post processing (step 213), terminates switching control.
The action of moving source base station
Fig. 8 is the device action flow chart of the moving source base station of the 1st embodiment.
In fig. 8, the mensure control unit 24a of moving source base station 11a is being received from movement station 14 by measuring report
During receiving status information (step 251), judge whether that needs switch over (Hand Over according to this receiving status information：OH)
(step 252), if not needing to switch over, returns to initial point.
But, when being defined as needing to switch over HO, switch control portion 24b determines shifting according to the content measuring report
Dynamic destination base station 11b, sends handover request (step 253) to this mobile destination base station 11b.
Then, when receiving from the HO response message that mobile destination base station 11b sends (step 254), HO controls
Portion 24b sends HO instruction message (step 255) to movement station 14, and instruction cache management portion 24a turns to mobile destination base station 11b
Send out (packets forwarding) and remain in the packet in buffer 21.Thus, 24a road by a dotted line in cache management portion moves radially purpose
Ground base station 11b forwards and is not sent to the packet of movement station 14 present in (forwarding) buffer 21b or is not normally connect
The packet (NACK packet) (step 256) received.Afterwards, receive the resource release message sending from mobile destination base station 11b
(step 257), execution resource release (step 258).
The action of movement station
Fig. 9 is the action flow chart of movement station.
The determination part 34a of movement station 14 passes through to measure report to (steps such as moving source base station 11a notice reception states
271).Afterwards, control unit 34 waits the HO sending from moving source base station 11a to indicate message, when receiving HO instruction message
(step 272), guarantees by L1/L2 signaling to keep synchronous (step 273) with mobile destination base station 11b, same ensure that
After step, send, to mobile destination base station 11b, the report (step 274) that switching completes.Then, control unit 34 checks and is received
To packet whether be to jump over packet, in other words, check whether the packet (step 275) for type=010, if jump point
Group, then excluded outside the object that reorders and saved it in buffer 32, after setting time, removes header
And it is set to that PDCP SDU packet passes to upper layer (step 276).On the other hand, if not jump packet, then execute weight
Sequence, rearranges in order, then passes to upper layer (step 277) as PDCP SDU.
Figure 10 is the handling process that reorders of movement station.
When the receiving and transmitting part 31 of movement station is when mobile destination base station 11b receives lower layer packet (step 301), reset
Can sequence management department 34b check and construct RLC PDU (step 302), when constructing, checks whether and have passed through setting time
(step 303), when not yet through setting time, the packet of this lower layer is saved in buffer 32 (step 304), is walked
Rapid 301 and its process afterwards.Still RLC PDU can not be constructed when have passed through setting time after receiving lower layer packet
When, delete lower layer packet (step 305) from buffer.
On the other hand, when RLC PDU can be constructed using the lower layer packet receiving in step 302, by this RLC
PDU passes to rearrangement prelude 33 (step 306) as RLC SDU (PDCP PDU).Reset prelude 33 and receive RLC SDU
When (PDCP PDU), check for serial number disappearance (step 307), if there is not disappearance but continuous in serial number,
The header then deleting this RLC SDU (PDCP PDU) is set into PDCP SDU and passes to upper layer (step 311).But,
If serial number has disappearance, prelude 33 is reset in the management department 34b that reorders instruction makes it preserve PDCP PDU (step 308).
Thus, reset prelude 33 and preserve PDCP PDU, and check whether that receiving serial number continuous RLC SDU (PDCP PDU) (walks
Rapid 309).If receiving serial number continuous RLC SDU (PDCP PDU), using this RLC SDU (PDCP PDU) as
PDCP SDU passes to upper layer, and the PDCP being preserved PDU is passed to upper layer (step 311).
If additionally, not receiving serial number continuous RLC SDU (PDCP PDU) in a step 309, monitored whether
Have passed through scheduled time TM(step 310), if not yet through scheduled time TMThen repeat step 308 and its process afterwards, and
When have passed through setting time TMWhen, even if serial number is discontinuous, also the PDCP being preserved PDU is passed to upper layer (step
311).
As described above, according to the 1st embodiment, 12 can will be stood to the transmission of mobile destination base station 11b from higher level
Packet is grouped, is transmitted to movement station 14 in the case of not waited as jump such that it is able to eliminate prolonging of data
Time late, it is possible to increase the overall handling capacity of system.Additionally, movement station 14 is arranged from the object of control (sequential control) of reordering
Except jump packet, sequential control is carried out to the packet outside jump packet, according to serial number order, packet is passed to higher level's dress
Put.Even if as a result, movement station only has a sequential control function it is also possible to the sequential control that is grouped.
(C) the 2nd embodiment
In the 1st embodiment, movement station 14 is in setting time TMPeriod carries out process of reordering, when have passed through setting time
TMWhen, terminate to reorder process (step 310 in Figure 10).Therefore, movement station 14 is receiving from moving source base station 11a to shifting
After all packets that dynamic destination base station 11b forwards, if still without setting time TM, then continue executing with the place that reorders
Reason.Here, in the 2nd embodiment, in order that movement station 14 can recognize that the last packet reordered in process object, moving
Dynamic destination base station 11b to regulation packet (last packet) additional discriminators and is transferred to movement station, and movement station 14 is receiving
To during this last packet, even if not yet through setting time TMAlso process of reordering can be immediately finished.
Figure 11 is the explanatory diagram of the 2nd embodiment, is set to before the handover, the packet n-5 that is stored with moving source base station 11a～
N, the packet n-5～n-2 in these packets has been sent to movement station 14, but packet n-1 and n is not sent to movement station
14.For example, because packet n-1 and n is just to arrive after the radiolink between cut-out moving source base station 11a and movement station 14
Reach, therefore these packets n-1 and n is not sent to movement station 14.Additionally, the packet n- being set in the packet sending to movement station
5th, the un-shifted station 14 of n-3 has correctly received (NACK), and is grouped n-4, n-2 and is received normally (ACK).Therefore, movement station
14 preserve packet n-4, n-2, without preserving packet n-5, n-3.
In this condition, when a switchover occurs, moving source base station 11a forwards to mobile destination base station 11b
(forwarding) un-shifted station 14 packet n-5 and n-3 normally receiving and packet n-1, n of not being sent to.Additionally, on
Level station 12 sends two packet m～m+1 to mobile destination base station 11b after handover.Wherein, if the forwarding of packet n-5～n
(forwarding) there occurs delay.
If mobile destination base station 11b from moving source base station 11a forward to be grouped before n-5, n-3, n-1～n from
Higher level station 12 receives packet m, m+1, then to packet m, m+1 additional hops identification code F receiving from this higher level station, and first will
They send (hop transmission) to movement station 14.Movement station 14 by receive from base station addition of jump identification code F packet
It is saved in buffer BF2, and they are excluded from the object of process of reordering.(A) of Figure 11 represents movement station 14 slow
Preserve packet m, m+1 in storage BF2, and preserve packet n-4, the n-2 receiving before the handover in buffer BF1
State.
Mobile destination base station 11b have passed through scheduled time TWWill till (referred to as Waiting Time (waiting time))
Forwarding that comes to send packets to movement station, and if having passed through the waiting time, forwarding the packet coming also can be by even if then receiving
It abandons.Therefore, mobile base station 11b was receiving the packet n- coming from the forwarding of moving source base station 11a before the waiting time
5th, n-3, n-1, and be saved in buffer BF and it is transferred to one by one movement station.And, it is located at and connect from moving source base station 11a
Receive packet n and the waiting time is then in the stage being not yet transferred to movement station.In this case, mobile destination base station
11b is the identifier (L) forwarding the last packet coming to the packet additional expression of n, and is transferred to movement station 14.
Packet n-5, n-3, n-1, n of receiving from mobile destination base station 11b are saved in buffer BF1 by movement station 14
In, such as shown in Figure 11 (B), process that packet n-4, n-2 execution receiving before these packets and switching is reordered, carry out again
Arrangement.Additionally, when detect be added to packet n identifier (L) when, be judged as that forwarding terminates, though reorder setting when
Between TMNot yet then, also the packet reordered is passed to upper layer, terminate to reorder process.
The above is waiting time situation then before sending packet n, but also exists and for packet n to be transferred to movement station
Waiting time situation then in stage afterwards.In this case, mobile destination base station 11b receives to from higher level station 12
The packet additional expression of m+2 be last packet identifier (L), and be transferred to movement station 14.Receive and addition of this identification
The movement station 14 of the last packet of symbol is judged as that forwarding terminates, even if setting time T reorderingMNot yet then also can be immediately
Terminate to reorder process.
In addition although packet n-3 be have received by forwarding, but also exist in the stage not receiving packet n-1, n
Waiting time situation then.In this case, mobile destination base station 11b is last packet to the packet additional expression of n-3
Identifier (L), and it is transferred to movement station 14.Movement station 14 detects the last packet that addition of this identifier (L) and terminates
Reorder process.
Finally it is grouped identification code L
When to the additional expression of packet being last identifier (being finally grouped identification code), in the header using PDCP PDU
" type " field of 3 bits comprising.That is, in this " type " field, new type number definition is grouped identification code for last
L, and this type numbering is distributed to the packet sending at first after the waiting time.Figure 12 is the form example of PDCP PDU,
(A) be no header form example, (B) is the form example of the serial number of not additional PDCP PDU, and (C) and (D) is to addition of PDCP
The form example of the serial number of PDU.In the form of (C) and (D), type field and PID field defined in header HD, use
Type field represents the classification of PDCP PDU.In type field, define " type=000 " and " type=001 ", and not
Specify and do not use " type=010～111 ".Thus, for example utilizing " type=011 ", passing through wait as identification
No. type of PDCP PDU packet (last packet) sending at first after time.
PDCP layer and the process of rlc layer
Figure 13, Figure 14 be switching after PDCP layer and rlc layer packet transaction explanatory diagram.
Figure 13 represents the situation that the packet n transmitting to movement station be addition of with last packet identification code L.Movement station 14 is in weight
Start intervalometer to judge the end reordered during sequence.Here, by setting time TMIn the case of being set to larger value,
With packet n be whether the last packet being forwarded independently, proceed process of reordering, in setting time TMBefore then
Can not will packet back to upper layer.But, in the 2nd embodiment, movement station 14 addition of last packet identification receiving
During packet n (the last packet) of code L, it is immediately finished and reorders, all of PDCP PDU is packeted back to upper layer.
Additionally, guarding against the situation of the data more than the data volume that can allow that arrived, movement station 14 is when reordering
Carry out window control.The left end of window by expectation reach numbering n-5, the right-hand member of window is as the data volume that can allow
The upper limit value (in figure be n).But, as described in Example 1, the packet application widget of " type=010 " is not processed.Logical
Cross this process, be able to carry out reordering for packet n-5～packet n.
Figure 14 represents the situation that packet m+2 be addition of with last packet identification code L.Movement station 14 is receiving packet m+2
The moment of (last packet), even if setting time TMNot yet then, also can be immediately finished and reorder, reception is all
PDCP PDU packets back to higher level's layer.Additionally, executing window control in the same manner as Figure 13.
The action of mobile destination base station
Figure 15 is the action flow chart of the mobile destination base station of the 2nd embodiment, to Fig. 7 of the 1st embodiment in step
Rapid identical step gives identical label.Base station in 2nd embodiment, movement station have the structure shown in Fig. 5, Fig. 6.
Switch control portion 24b of mobile destination base station 11b from moving source base station 11a receive HO request (comprise move
The dynamic ID and QoS information etc. of standing) when, carry out Call control according to these information, determine whether to access movement station.As
Fruit does not allow, then execute post processing, then terminates switching control (step 201～202,213).
On the other hand, in the case that switch control portion 24b allows to access movement station 14, reply to moving source base station 11a
HO request response, and start to carry out timing to the elapsed time.Then, mobile destination base station 11b waits from moving source base
The 11a that stands forwards the packet of coming, and stores the packets in (step 203～204) in buffer unit 21.
In this condition, switch control portion 24b is when receiving, from movement station 14, the report that HO completes, the report that HO is completed
Accuse and give higher level station 12 (step 205～206).Higher level station 12, when receiving the report that switching completes, road is transmitted in packet
Footpath is switched to mobile destination base station 11b from moving source base station 11a, replys HO to mobile destination base station and completes to respond.Mobile
Switch control portion 24b of destination base station 11b from higher level station receive HO complete response when, instruction scheduling unit 22 start send
Packet (step 207～208).
Then, scheduling unit 22 monitors whether the elapsed time has exceeded setting time TW, i.e. waiting time whether then (step
Rapid 501), if the waiting time not yet then, check the need for the hop transmission (step 209) being grouped, if not
Need, then forwarded the packet coming to start preferentially to be sent to it movement station 14 (step 210) from mobile destination base station 11a.
But, occur postponing thus when needing the hop transmission being grouped, scheduling unit 22 executes and receives from higher level station 22 when forwarding
Packet hop transmission.In order to execute hop transmission, will the classification number of the type field of packet header of hop transmission set
It is set to 010 (type=010) so that movement station 14 can recognize that this packet is jump packet, then this packet is transferred to
Movement station (step 210).
Process concurrently with above, switch control portion 24b sends resource release message (step to moving source base station 11a
212) whether then, return to step 501, check the waiting time, if not yet then, repeated execution of steps 209 and afterwards
Process.
On the other hand, if in step 501 the waiting time then, after the waiting time is then at once by transmission
No. type of packet is set to " 011 ".That is, at once packet to be transmitted is added with last packet identification code L after then, and
This is grouped (last packet) and is transferred to movement station (step 502～503), then carry out post processing, terminate switching control
(212～213).
In addition, in step 502, in order to identify the last packet that addition of last packet identification code L be from
Moving source base station 11a forwards the packet of coming, or the packet receiving from higher level station 12, by No. type in the case of for the former
It is set as " 011 ", in the case of for the latter, be set as " 100 " by No. type.Thus make the rearrangement of movement station 14 described later
Sequence is processed becomes easy.
The action of movement station
Figure 16 is the action flow chart of movement station, to the identical label of motion flow identical step mark in Fig. 8.Move
The determination part 34a at dynamic station passes through mensure report and notifies reception state etc. to moving source base station 11a.Afterwards, control unit 34 wait from
The HO instruction message that moving source base station sends, when receiving HO instruction message, is guaranteed by L1/L2 signaling and mobile mesh
Ground base station 11b keep synchronous, after ensure that synchronization, send, to mobile destination base station, the report (step that switching completes
271～274).
Then, control unit 34 checks whether received packet is to jump over packet, in other words, checks whether as type=
This packet exclusion if jump packet, then and is saved it in outside the object that reorders by 010 packet (step 600)
In buffer 32 (step 601).
On the other hand, if not jump packet, then check whether received packet is last packet, changes speech
It, check whether the packet (step 602) for type=011.If not last packet, then start to reorder, and by suitable
Ordered pair PDCP PDU packet is rearranged, and generates PDCP SDU and passes to upper layer (step 603).
Then, check scheduled time TMWhether then (step 604), if setting time TMNot yet then, then repeat step
600 and process afterwards, and if setting time TMThen, then terminate process of reordering, then from not yet passing to upper layer
PDCP PDU packet in delete header and generate PDCP SDU, and pass it to upper layer (step 605).Then, will weigh
Packet outside ranked object passes to upper layer and terminates to process (step 606).
On the other hand, in step 602, if received packet is last packet, stop at once reordering
Process (step 607).Now, if last packet is to forward the packet of coming, PDCP is generated by this last packet
SDU is grouped and passes to upper layer, stops reordering.If additionally, last packet is the packet receiving from higher level station 12,
Then at once stop reorder, the packet outside this last packet is connected on the object that reorders last.Then, will reorder right
As outside packet pass to upper layer and terminate process (step 606).
As described above, according to the 2nd embodiment, movement station is to detect, with reference to the last identification code that is grouped, the feelings forwarding end
Condition, thus, it is possible to stop immediately reordering.Therefore, it is possible to eliminate the time delay of data, improve the overall handling capacity of system.
(D) the 3rd embodiment
Order information (serial number n, m) shown so far be for convenience of description and utilize simple numbering, and
Actually order information is added by base station.
As previously shown, in LTE communication system, forwarding is to implement according to the data unit of PDCP SDU.Therefore, exist
It is impossible to send Sequence Number word from moving source base station 11a to mobile destination base station 11b in the case of forwarding
Section, thus need some way to carry out notification sequence number (Sequence Number).
In the present embodiment, serial number and PDCP SDU data are collectively notified mobile destination by moving source base station 11a
Base station, and mobile destination base station based on this serial number by this serial number be added to forward come PDCP SDU data (point
Group).
Figure 17 is that the serial number of PDCP PDU is attached in corresponding PDCP SDU data (packet) (in band), and leads to
Cross the example that datum plane (U-Plane) is notified.Although illustrate only PDCP SDU data in fig. 17 and accompanying
The serial number SN of this data, but in order to using this PDCP SDU data as set of group in addition it is also necessary to additional control information (header
Information).Moving source base station 11a, in each forwarding PDCP SDU data, all can notify attach at this according to the form of Figure 17
Serial number SN in PDCP SDU data, this serial number is added to forwarding based on this serial number and comes by mobile destination base station 11b
PDCP SDU data (packet).
That is, under the situation of Figure 17, moving source base station 11a first pass through datum plane U-plane forward serial number n-5 and
Initial PDCP SDU data.Then, serial number n-3 and next PDCP SDU data are forwarded by U-plane.Afterwards, exist
When forwarding PDCP SDU data n-1, n receiving from higher level station 12, likewise by U-plane to mobile destination base station
11b forwards serial number PDCP SDU data and its serial number.In mobile destination base station 11b, due to receiving by U-
Serial number n-5, n-3, n-1, n that plane notifies, thus, it is possible to identify the serial number being forwarded the data come.
Figure 18 is that the serial number SN of PDCP PDU is attached in corresponding PDCP SDU data (in band) and by U-
Plane is notified, and moving source base station 11a will fail to confirm the sequence of the PDCP SDU data being normally received by movement station simultaneously
The example that row number is notified by control plane (C-plane) as next SN.In the transfer sequence in figure of Figure 19, will lead to
Cross the serial number (next SN) that this C-plane carries out to notify to be expressed as " SN handing-over ".SN handing-over can be with moving source base station 11a
Carry out HO request to mobile destination base station 11b simultaneously to carry out.
In the situation of Figure 18, moving source base station 11a first passes through U-plane and forwards serial number n-5 and initial PDCP
SDU data.Then, serial number n-3 and next PDCP SDU data are forwarded by U-plane.Additionally, moving source base station 11a
Only the serial number n-5 failing to confirm the PDCP SDU being normally received by movement station is passed through C- as next SN simultaneously
Plane notifies to mobile destination base station 11b (SN handing-over).Afterwards, moving source base station 11a receives from higher level station 12 in forwarding
PDCP SDU data n-1, n when, similarly forward PDCP SDU data and its sequence via U-plane to mobile destination 11b
Row number.Mobile destination base station 11b receives the serial number n-5 notifying by C-plane and the serial number notifying by U-plane
N-5, n-3, n-1, n, but the serial number due to being notified by U-plane is bigger than the serial number being notified by C-plane, therefore
The serial number being notified by U-plane based on this is to PDCP SDU data appended sequence number hereafter, and is transferred to movement station.
That is, mobile destination base station 11b ignores the serial number n-5 notifying by C-plane.
Figure 20 is the example being completely absent the situation of PDCP SDU data to be forwarded.
As next SN, moving source base station 11a notifies not can confirm that to mobile destination base station 11b via C-plane
To the serial number n+1 being normally received by movement station.If in the case that moving source base station 11a does not receive PDCP SDU data
Waiting time then, then mobile destination base station 11b based on the serial number being notified by C-plane to PDCP SDU number hereafter
According to appended sequence number, and it is transferred to movement station.That is, the sequence of packet m that mobile destination base station 11b will receive from higher level station 12
Row number is set to n+1 and is transferred to movement station.
More than, in accordance with the invention it is possible to will stand to the next packet of mobile destination base station transmission as jump point from higher level
Group and be promptly transferred to movement station, can eliminate the time delay of data, improve the overall handling capacity of system.Additionally, it is mobile
Exclusion jump from the object of control (sequential control) of reordering of standing is grouped, and carries out order to the packet outside jump packet and controls
Packet is passed to epigyny device according to serial number order by system.Even if as a result, movement station only has a sequential control work(
Can be it is also possible to correctly carry out the sequential control of object packet of reordering.
Additionally, according to the present invention, movement station is to detect, with reference to the last identification code that is grouped, the situation forwarding end, thus, it is possible to
Enough stoppings immediately being reordered.Therefore, it is possible to eliminate the time delay of data, improve the overall handling capacity of system.
Claims (1)
1. a kind of movement station is it is characterised in that this movement station has：
Receiving unit, it receives the 1PDCP PDU forwarding from moving source base station, and receives the from mobile destination base station
2PDCP PDU, wherein, described moving source base station is passed through user plane and is believed according to having header to described mobile destination base station
The form of breath, PDCP SDU and the serial number being additional to this PDCP SDU forwards PDCPSDU and serial number successively, this 2PDCP
PDU is that the PDCP SDU that this is forwarded is added with the serial number that this is forwarded and generates, and, this receiving unit is from will be from institute
State the serial number that moving source base station receives to be used as the serial number of PDCP SDU that receives from higher level station and be added to this PDCP
The described mobile destination base station of SDU receives the 3PDCP PDU that addition of this serial number；
Memory element, it stores described 1PDCP PDU, described 2PDCP PDU and described 3PDCPPDU；And
Reorder unit, its according to this serial number, by the PDCP SDU of the PDCP being stored PDU by serial number order to upper
Layer transmission.
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| CN201210122459.XA CN102711197B (en) | 2007-04-26 | 2007-04-26 | Mobile station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200780052592XA CN101653027B (en) | 2007-04-26 | 2007-04-26 | Mobile station, communication system and reordering method |
| CN201210122459.XA CN102711197B (en) | 2007-04-26 | 2007-04-26 | Mobile station |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200780052592XA Division CN101653027B (en) | 2007-04-26 | 2007-04-26 | Mobile station, communication system and reordering method |
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| CN102711197B true CN102711197B (en) | 2017-02-08 |
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| CN103888215B (en) * | 2012-12-21 | 2017-11-28 | 华为技术有限公司 | Data transmission method, device and communication system |
| WO2014110786A1 (en) * | 2013-01-18 | 2014-07-24 | 华为技术有限公司 | Data transmission method and device |
| CN108632177A (en) * | 2017-03-24 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of transmission method and electronic equipment of control packet |
| CN108810984B (en) | 2017-05-05 | 2020-03-24 | 维沃移动通信有限公司 | Data processing method and device |
| WO2018227628A1 (en) * | 2017-06-16 | 2018-12-20 | Oppo广东移动通信有限公司 | Data transmission method, network device, and terminal device |
| WO2018232701A1 (en) * | 2017-06-22 | 2018-12-27 | 北京小米移动软件有限公司 | Data transmission method, device, user equipment and base station |
| WO2020090920A1 (en) * | 2018-10-31 | 2020-05-07 | 三菱電機株式会社 | Communication system and receiving-side device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1059823A1 (en) * | 1999-06-11 | 2000-12-13 | Lucent Technologies Inc. | Primary transfer for simplex mode forward-link high-speed packet data services in CDMA systems |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1059823A1 (en) * | 1999-06-11 | 2000-12-13 | Lucent Technologies Inc. | Primary transfer for simplex mode forward-link high-speed packet data services in CDMA systems |
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