CN102761490A - Base station, mobile station and wireless communication system - Google Patents

Base station, mobile station and wireless communication system Download PDF

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Publication number
CN102761490A
CN102761490A CN2012102513510A CN201210251351A CN102761490A CN 102761490 A CN102761490 A CN 102761490A CN 2012102513510 A CN2012102513510 A CN 2012102513510A CN 201210251351 A CN201210251351 A CN 201210251351A CN 102761490 A CN102761490 A CN 102761490A
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base station
grouping
mobile radio
station
radio station
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CN102761490B (en
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太田好明
田岛喜晴
大渕一央
河崎义博
田中良纪
杉山胜正
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Fujitsu Ltd
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Fujitsu Ltd
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Abstract

The invention discloses a base station, a mobile station and a wireless communication system. The mobile station is characterized in that serial number is received from a mobile destination station, and the mobile destination station is the base station that takes the serial number received from the mobile station as the serial number of a sub group, which is received from a superior station.

Description

Base station, mobile radio station and wireless communication system
The application is that the original bill application number is the application for a patent for invention (international application no: PCT/JP2007/059037 of 200780052592.X; The dividing an application applying date: on April 26th, 2007, denomination of invention: base station, mobile radio station, communication system, sending method and method for reordering).
Technical field
The present invention relates to base station, mobile radio station and wireless communication system.
Background technology
At present; GSMs such as mobile phone have begun based on the business under the third generation mode of CDMA mode; But under 3GPP (third generation partner program), launched next generation mobile communication system (LTE:Long Term Evolution: discussion Long Term Evolution) (non-patent literature 1) about carrying out more high-speed communication.Mention here, except the high speed of transmission rate, cutting down transmission delay also is great problem.
In order to make the transmission rate high speed and to cut down transmission delay and carried out such research, that is: in the LTE communication system, compare with in the past system, realized the High Level of switching (Hand Over) method.In mobile communication, when mobile radio station moves, understand the conversion (switching) of the base station that communicates according to accepting state in communication.Therefore, for high speed/low delay communication, realize that the High Level of switching is must be obligato.In the LTE communication system, be basic with the packet switching system, therefore switch (Hand Over) and just become Hand Hand Over.In Hand Hand Over, after the circuit between the base station that before having cut off mobile radio station and having moved, has communicated is connected, carries out mobile radio station and be connected with circuit between the mobile destination base station.In Hand Hand Over, owing to being about to switch the system information that has obtained mobile destination base station before, therefore can switch to the short time, but the transmission interrupt status of user data can take place in switching.
Therefore, in order to reduce transmission delay, particularly importantly, shorten the transmission interrupt status and prevent to transmit the disappearance of dividing into groups in the interrupt procedure.In case under the situation that in the transmission interrupt procedure, has taken place to divide into groups to lack, need recover through dividing into groups resend end to end, so transmission delay becomes big.
In addition; In the switching of LTE communication system; With following methodological standardization; Said method is: through from the moving source base station to move destination base station transmit comprise the control information of issuing mobile radio station and be grouped in data, not grouping from this moving source base station transmits to mobile radio station, join thus by (non-patent literature 2).
Handing-over during switching
Handing-over key diagram when Figure 21 is switching.In Figure 21 (A), two base station 1a, 1b are connected with higher level station (for example MME/SAE gateway) 2.Mobile radio station 4 is present in the sub-district 3a of base station 1a, currently communicates with base station 1a.Under this state, shown in Figure 21 (B), to carry out when the direction of base station 1b moves and enter in the 3b of sub-district when mobile radio station 4 and to switch, 1a switches to base station 1b to the communication base station of mobile radio station from the base station.Wherein, the base station of switching preceding ongoing communication is called moving source base station (source base station), the base station that communicates after switching is called mobile destination base station (target BS).
Moving source base station 1a will stand 2 packet stores that receive built-in buffer from the higher level, and send successively to mobile radio station 4 and to be kept at the grouping in this buffer.Therefore, when switching, be stored in the buffer and do not send to the grouping of mobile radio station as yet.In Figure 21 (B), in buffer, store the grouping n-2～n that receives and do not send before switching to mobile radio station, need after switching, these be divided into groups to send to mobile radio station 4 from moving destination base station 1b.Therefore, when switching sequence was carried out, moving source base station 1a transmitted (forwarding) with grouping n-2～n and gives mobile destination base station 1b.Through using this retransmission method, move destination base station 1b and after switching, send and should divide into groups to mobile radio station 4 at once, therefore can not take place to divide into groups to interrupt.So, can not take place to divide into groups end to end to resend, can carry out switching at a high speed.In addition, said n-2～n is the numbering (sequence number) of expression order of packets.
Switch
Figure 22 is the switching key diagram of LTE communication system, and Figure 23 is the switch step key diagram of imagining at present in the LTE communication system.
Mobile radio station 4 need switch HO (Hand Over) (1. measuring control) through measuring report (Measurement Report) (from the reception status report of base station 1 and peripheral base station) to moving source base station 1 notice.
Target BS 1b (the 2.HO destination is confirmed) is confirmed according to the content of measuring report in moving source base station 1, and moves destination base station 1b to this and send handoff request (3.HO request).Service quality) information etc.) etc. at this moment, moving source base station 1a also sends information (mobile radio station ID and QoS (the Quality of Service: of mobile radio station.Move destination base station 1b and call out access control (4. calling out access control) according to these information.
When mobile destination base station 1b allows to insert mobile radio station, reply handoff response (5.HO response) to the moving source base station.Then, moving source base station 1a sends to mobile radio station 4 and switches indication (6.HO indication), and before and after this, begins (packet forward: the forwarding) handing-over of data (grouping).
Receive the mobile radio station 4 that switches indication and guarantee to keep synchronous (7. guaranteeing synchronously), after having guaranteed synchronously, send the report (8.HO completion) of switching completion to moving destination base station 1b with mobile destination base station 1b through the L1/L2 signaling.
Thus, move report that destination base station 1b will switch completion and send to higher level's 2 (9.HO completion) of standing.The higher level stands 2 when receiving the report of switching completion, and 1a switches to mobile destination base station 1b (10. switch in the path) from the moving source destination with packet transmission path, and responds (11.HO accomplishes response) to mobile destination base station 1b answer HO completion.Moving destination base station 1b accomplishes response and accomplishes (release of 12. resources) to moving source base station 1a notice switching HO according to HO.Afterwards, eliminate moving source base station 1a and the higher level path (release of 13. resources) between 2 of standing.
The order coupling control of dividing into groups
In above-mentioned switching sequence was carried out, when packet forward (forwarding) took place, in mobile destination base station 1b, the grouping that possibly cause this forwarding owing to the grouping of 2 entering of standing from the higher level was jumped, thereby causes sequence number disorderly.If mobile destination base station 1b transmits grouping to mobile radio station 4 under the state of sequence number disorder, then mobile radio station can not receive grouping by correct order, so the communication quality deterioration, and the result causes can't realizing high-quality communication in the switching front and back.
At this, for the LTE communication system, in base station and mobile radio station, utilize following method to keep the order matching of dividing into groups.Figure 24 is the key diagram of the order coupling of this grouping, and 1a transmits the grouping of coming from the moving source base station than the packet priority transmission that receives from the higher level station to move destination base station 1b, keeps the order matching of dividing into groups thus.
In Figure 24, before switching, in the 1a of moving source base station, store grouping n-5～n, the grouping n-5～n-2 during these divide into groups has been sent out to mobile radio station 4, and grouping n-1 and n are not sent out to mobile radio station 4 as yet.In addition, grouping n-5 in the grouping that mobile radio station sends and n-3 are not moved station 4 and correctly receive (NACK), and grouping n-4 and n-2 are then normally received (ACK).Therefore, mobile radio station 4 is kept at grouping n-4, n-2 among the buffer BF1, and does not preserve grouping n-5 and n-3.
Under this state; When switching; Moving source base station 1a transmits grouping n-1～n that (forwarding) is not moved the station 4 normal grouping n-5 that receive and n-3 and do not send to mobile radio station 4 as yet to moving destination base station 1b, mobile destination base station 1b with this packet memory in buffer BF.In addition, the higher level stands and 2 after switching, sends two grouping m～m+1 that will issue mobile radio station 4 to moving destination base station 1b, move destination base station 1b with this packet memory in buffer BF.
When mobile destination base station 1b can communicate with mobile radio station 4, at first preferentially send grouping n-5, n-3, the n-1～n that the 1b forwarding comes from the moving source base station to mobile radio station 4.Then, send the 2 grouping m～m+1 that receive that stand from the higher level.Shown in figure 25, mobile radio station 4 is arranged receiving the grouping n-5, n-3, n-1～n, the m～m+1 that receive after grouping n-4, n-2 and the switching that finishes before switching according to the sequence number order again, and passes to upper layer to them in order.
Be grouping n-5, n-3, n-1～n all to be transmitted the situation that (forwarding) gives mobile destination base station 1b above, only transmitted grouping n-5, n-3 but also exist, and situation about postponing appearred in the forwarding of n-1～n through transmitting (forwarding).Figure 26 is the key diagram of the order of packets coupling under this situation.Move destination base station 1b and will transmit the grouping n-5 that comes, n-3 and be stored in the buffer BF, but at first preferentially send next grouping n-5, the n-3 of 1a forwarding from the moving source base station to mobile radio station from the higher level grouping m～m+1 that gets into that stands.Then; Forwarding at the grouping n-1 that is undertaken by moving source base station 1a, n has occurred under the situation of delay; Move destination base station 1b and keep watch on whether passed through setting-up time (Waiting Time: the stand-by period); When having passed through that the stand-by period, still 1a did not transmit the n-1 that divides into groups, n from the moving source base station, be regarded as transmitting and finish, send the grouping m, the m+1 that stand and receive from the higher level.In addition, after transmitting end, 1a receives grouping n-1, n from the moving source base station even move destination base station 1b, also can this grouping be abandoned.
Mobile radio station 4 is carried out the processing (reordering) of the grouping that receives being arranged again by the sequence number order.Shown in figure 27, mobile radio station 4 is arranged receiving the grouping n-5, n-3, m, the m+1 that receive after grouping n-4, n-2 and the switching that finishes before switching by the sequence number order again, and passes to upper layer to them in order.
Protocol architecture
As stated, in the switching of LTE communication system, packet forward (forwarding) and the processing of reordering of dividing into groups are necessary technology.Here, these function relationship are explained in more detail.
Figure 28 is the key diagram of the protocol architecture between expression mobile radio station and the network.Between mobile radio station and base station, be provided with PDCP (Packet Data Convergence Protocol: PDCP) layer, RLC (Radio Link Control: Radio Link control) layer and lower layer (MAC layer/physical layer MAC/PIIY) at least.MME/S-GW possesses packet routing function etc.
The major function of each agreement is following.
(1) PDCP: in the PDCP layer, the header of bit protocol in the transmitter side compression, and appended sequence number is sent.At receiver side, sequence number is checked, repeat the waste treatment that receives thus.In the PDCP layer, do not resend.
(2) the RLC:RLC layer is the layer with the function of resending, new additional with from the sequence number in the different rlc layer of the sequence number that adds in the data of PDCP, and send.For example,, these data are divided into many parts, to sequence number I (1), I (2), the I (3) in the additional respectively rlc layer of each partition data receiving sequence number from PDCP when being the data of n ..., and send.Receiver side utilizes this sequence number I (), sends to confirmation signal (Ack/Nack signal) to what the normal reception of transmitter side notification list registration certificate/unusual received.If returned the Ack signal, then transmitter side abandons the data of being preserved, and on the other hand, if returned Nack, then transmitter side resends the corresponding data of being preserved.
(3) lower layer
The MAC:MAC layer is the layer that the data of rlc layer is carried out multiplexing/separation.That is, at transmitter side, to the data of rlc layer carry out multiplexing with it as sending data, at receiver side, be the reception data separating of MAC layer the data of rlc layer.
The PIIY:PIIY layer be between user terminal 4 and base station 1 with wireless mode carry out data transmit-receive the layer, convert the MAC layer data to wireless data, or convert wireless data to the MAC layer data.
The data of sending to mobile radio station at first get into the PDCP layer and become PDCP SDU (Service Data Unit: service data unit), become PDCP PDU (Protocol Data Unit: protocol Data Unit) by additional header information (sequence number of PDCP layer etc.) then from upper layer (for example IP layer).
PDCP PDU is sent back to rlc layer and becomes RLC SDU, is become RLC PDU by additional header information (sequence number of rlc layer etc.) then.RLC PDU arrives the rlc layer of mobile radio station through the processing of lower layer.In this rlc layer, remove header and construct RLC SDU again, in the PDCP layer, remove the header of PDCP PDU then and become PDCP SDU, and be sent back to upper layer.
In this protocol architecture, for the LTE communication system, be that unit implements packet forward with PDCP SDU, be that unit implements to reorder with PDCP PDU.In addition, being that unit implements under the situation of forwarding with PDCP SDU,, therefore can't this sequence number not transmitted being the header information such as grouping appended sequence number of unit with PDCP SDU.Therefore, be that unit implements also will transmit the header information such as sequence number that add under the situation of forwarding with PDCP SDU.In addition, RLC SDU comes down to identical data with PDCP PDU, and therefore short of in this manual special qualification just is referred to as grouping with them, and under the situation of the numbering of having described this grouping, this numbering is meant the sequence number of PDCP PDU.
The action of moving source base station apparatus
The action flow chart of the moving source base station apparatus when Figure 29 is switching.
Moving source base station 1a judges whether to switch HO (step 102) through measuring report (step 101) when user terminal 4 receives received electric field strength etc., if need not switch then turn back to initial point.
But when confirming as need switch the time, moving source base station 1a confirms to move destination base station 1b according to the content of measuring report, moves destination base station 1b transmission handoff request (step 103) to this.
Then, receive, carry out the forwarding (step 107) of packets remaining from moving the handoff response (step 104) that destination base station 1b sends.
Afterwards, receive, carry out resource and discharge (step 109) from moving the resource release message (step 108) that destination base station 1b sends.
Move the action of destination base station
The action flow chart of the mobile destination base station when Figure 30 is switching.
Move destination base station 1b when 1a receives HO request (comprising mobile radio station ID and QoS information etc.) from the moving source base station (step 121), call out access control, judge whether to allow to insert mobile radio station (step 122) according to these information.If do not allow, then carry out reprocessing (step 130), finish switching controls.
On the other hand, allowing to insert under the situation of mobile radio station, reply HO response (step 123) to moving source base station 1a.Then, move destination base station 1b and will transmit the packet memory (step 124) buffer of coming by 1a, and receive the report (step 125) that HO accomplishes from mobile radio station 4 from the moving source base station.If receive the report that HO accomplishes, then move report that destination base station 1b accomplishes HO and send to higher level's 2 (steps 126) of standing.The higher level stands 2 when receiving the report of switching completion, and 1a switches to mobile destination base station 1b from the moving source base station with packet transmission path, replys HO to mobile destination base station 1b and accomplishes response.If moving destination base station 1b stands from the higher level and 2 receives HO and accomplish response (step 127); Then from beginning it is preferentially sent to mobile radio station by moving the next grouping of destination base station 1b forwarding; After having sent this grouping, send the 2 grouping (scheduling: step 128) that receive of standing from the higher level to mobile radio station.In addition, with step 128 concurrently, move destination base station 1b and send resource release message (step 129) to moving source base station 1a, carry out reprocessing (step 130), finish switching controls.In addition, under the situation that the packet forward of in the scheduling of step 128 is handled, being undertaken by moving source base station 1a takes place to postpone, move destination base station 1b and keep watch on whether passed through setting-up time (Waiting Time: the stand-by period); Still transmit when dividing into groups when having passed through the stand-by period; Be regarded as transmitting and finish, send the grouping of standing and receiving from the higher level, and after forwarding finishes; Even 1a receives grouping from the moving source base station, also can this grouping be abandoned.
The action of mobile radio station
The action flow chart of the mobile radio station when Figure 31 is switching.
The determination part of mobile radio station 4 is through measuring report to (steps 151) such as moving source base station notice received electric field strengths.Afterwards, wait for HO indication, when receiving the HO indication (step 152) from moving source base station 1a; Guarantee to keep (step 153) synchronously through the L1/L2 signaling with mobile destination base station 1b; After having guaranteed synchronously, send the report (step 154) of switching completion to moving destination base station 1b, then; Mobile radio station is carried out the processing (step 155～160) of reordering receiving when dividing into groups from moving destination base station 1b.
That is, the control part of mobile radio station is constructed RLCSDU receiving lower layer when dividing into groups from moving destination base station 1b, this RLC SDU (PDCP PDU) is given reset prelude (step 155).Reset the prelude checking sequence and number whether have disappearance (step 156),, then this RLC SDU (PDCP PDU) is passed to upper layer (step 160) as PDCP SDU if there is not disappearance in sequence number but is continuous.On the other hand, if there is disappearance in sequence number, then the control part indication is reset prelude and is preserved PDCP PDU.Thus, reset prelude and preserve PDCP PDU (step 157), and whether inspection receives the continuous RLC SDU of sequence number (PDCP PDU) (step 158).If receive the continuous RLC SDU of sequence number (PDCP PDU), then this RLC SDU (PDCP PDU) is passed to upper layer as PDCP SDU, and the PDCP PDU that is kept is passed to upper layer (step 160).
In addition, in step 158, if do not receive the continuous RLC SDU of sequence number (PDCP PDU); Then keep watch on and whether passed through the scheduled time (step 159); If do not pass through the scheduled time as yet, then repeating step 157 and after processing, and if passed through the scheduled time; Even then sequence number is discontinuous, also to the PDCP PDU that preserved be passed to upper layer (step 160).
Problem
But, when in the LTE communication system, carrying out, have following problem with the packet forward switched.That is, when carrying out switching, as stated, in the LTE communication system, carry out the handing-over that is retained in the moving station number certificate among the 1a of moving source base station, and produce the packet forward (forwarding) of following handing-over.But; In above-mentioned switching controls, when the value of the stand-by period (Waiting Time) of moving destination base station 1b hour, do not transmit all groupings as yet although exist; Mobile destination base station 1b just begins to transmit the grouping that receives from the higher level station, thereby abandons the problem of the grouping of not transmitting as yet.On the other hand, when the value of stand-by period is big, moves destination base station 1b through not transmitting the grouping that receives from higher level station before the stand-by period, thereby have the problem of generation transmission delay.That is, in switching controls in the past, the problem of communication delay increase and throughput degradation can take place, can't before and after switching, guarantee high-quality communication.
As the 1st prior art, exist from the moving source base station to moving destination base station and notify the method (with reference to non-patent literature 3) of the last grouping (Last Packet) of being transmitted.Transmitting under the situation that occurs postponing, notified the mobile destination base station of last grouping can the sequence number of the grouping that receives from the higher level station be made as sequence number+1 of last grouping and the transmission of jumping.In addition, the sequence number of the sequence number of the grouping that mobile destination base station can be next with forwarding and last grouping compares, and forces to finish waiting timer (Waiting Timer) thus, thereby can regularly detect the end of forwarding in the best.But, in repeating process, having abandoned under the situation of last grouping, mobile destination base station can't detect last grouping reliably.
In addition,, there is such GSM: when this GSM is used between the base station of just carrying out high speed packet communication, switching, realize not taking place the HRPD forwarding (with reference to patent documentation 1) of loss of data as the 2nd prior art.In this GSM, when switching, (forwarding) grouped data is transmitted to handover destination base station in the base station of handover source.But this technology is not improved the communication delay that is caused by reordering of mobile radio station and is increased and throughput degradation.
In addition,, there is such method: in moving destination base station, do not wait for the arrival of the grouping of being transmitted, but jumpily transmit the grouping (with reference to patent documentation 2) of standing and transmitting from the higher level as the 3rd prior art.In the method, through distinguishing grouping that receives from the moving source base station and the grouping that receives from the higher level station, can realize the jump transmission of dividing into groups.But, the function of two sequential controls need be set in mobile radio station, cause its control to become complicated.
By last, the objective of the invention is to, the grouping that stand from the higher level (for example different with the moving source base station, to moving the device that destination base station sends data (groupings)) are transferred to mobile destination base station is transferred to mobile radio station rapidly.
Another object of the present invention is to; Even transmitting grouping that comes and the grouping that the transmission of standing from the higher level comes from the moving source base station mixes; Also can only utilize a sequential control function correctly to reorder thus through from the object of sequential control, getting rid of this from the grouping that the higher level stands and transmits to transmitting the grouping that comes.
In addition, another object of the present invention can be positioned, provide record among the embodiment etc. not by the disclosed item of prior art.Preferably, such item be for obtain prior art the necessary item of effect that can't obtain.
Non-patent literature 1:3GPP, " Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN), " TR25.913V7.3.0, Release7, March2006.
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, April2007.
Non-patent literature 3:Samsung, " Method to release resources at source ENB during handover, " R3-061032, RAN3#53, September2006.
Patent documentation 1: TOHKEMY 2004-282652 communique
Patent documentation 2: Japan is special is willing to 2006-086537 number
Summary of the invention
Mobile radio station of the present invention is characterised in that this mobile radio station is from following mobile destination base station receive sequence number, and this moves destination base station is with the base station of the sequence number that receives from the moving source base station as the sequence number of the grouping that receives from the higher level station.
Wireless communication system of the present invention is characterised in that; This wireless communication system has: moving source base station, mobile destination base station and mobile radio station; Said mobile radio station is from following mobile destination base station receive sequence number, and this moves destination base station is with the base station of the sequence number that receives from the moving source base station as the sequence number of the grouping that receives from the higher level station.
Base station of the present invention is characterised in that, the sequence number that this base station will receive from the moving source base station is as the sequence number that moves the grouping that destination base station receives from the higher level station.
Description of drawings
Fig. 1 is the key diagram of the 1st embodiment.
Fig. 2 is the form example that PDCPPDU divides into groups.
Fig. 3 is the key diagram that switches the packet transaction of preceding PDCP layer and rlc layer.
Fig. 4 is the key diagram of the packet transaction of PDCP layer and rlc layer after switching.
Fig. 5 is the structure chart of base station.
Fig. 6 is the structure chart of mobile radio 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 mobile radio station of the 1st embodiment.
Figure 10 is the handling process that reorders of mobile radio station.
Figure 11 is the key diagram of the 2nd embodiment.
Figure 12 is the form example that PDCPPDU divides into groups.
Figure 13 be the packet transaction of PDCP layer and rlc layer after switching key diagram (one of).
Figure 14 is the key diagram (two) of the packet transaction of PDCP layer and rlc layer after switching.
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 mobile radio station of the 2nd embodiment.
Figure 17 attaches the example of after corresponding PDCP SDU data, also notifying through datum plane (U-Plane) with the sequence number of PDCP PDU.
Figure 18 is that the sequence number SN with PDCP PDU attaches after corresponding PDCP SDU data and through U-Plane and notifies, simultaneously the example through C-plane notification sequence number.
Figure 19 is the transfer sequence step of Figure 18.
Figure 20 is the example that does not have the PDCP SDU data conditions that will transmit fully.
Handing-over key diagram when Figure 21 is switching.
Figure 22 is the switching key diagram of LTE communication system.
Figure 23 is a present contemplated switch step key diagram in the LTE communication system.
Figure 24 is the 1st key diagram that reorders and handle of mobile radio station.
Figure 25 is the 2nd key diagram that reorders and handle of mobile radio station.
Figure 26 is the 3rd key diagram that reorders and handle of mobile radio station.
Figure 27 is the 4th key diagram that reorders and handle of mobile radio station.
Figure 28 is the key diagram of the protocol architecture between expression mobile radio station and the network.
The action flow chart of the moving source base station apparatus when Figure 29 is switching.
The action flow chart of the mobile destination base station when Figure 30 is switching.
The flow chart of the mobile radio station when Figure 31 is switching.
Embodiment
(A) principle of the present invention
In the present invention, solve its problem through making base station and mobile radio station can carry out following two processing.
Handle 1: after switching; Because delay has taken place in the data forwarding from the moving source base station; Therefore do not wait for the reception of these data and transmit (transmission of jumping) data that the machine reception finishes from the higher level station; In this case, making mobile radio station can identify these data is hopped datas, and carries out the transmission of jumping.That is, will be used for discerning is that the identifying information of hopped data is included in this data, perhaps this identifying information is appended in these data, this identifying information and this data is mapped, and for example utilizes control channel to send.
Handle 2: mobile radio station is not regarded as the object that reorders with this hopped data detecting under the situation about transmitting that taken place to jump, and it is kept in the buffer, waits for the arrival of changeing data sent from the moving source base station.That is, use the data that identifying information is distinguished to be changeed data sent and do not send through the moving source base station from the moving source base station, the rearrangement preface of going forward side by side.
In existing method, under the situation that has taken place to postpone to the data forwarding (forwarding) that moves destination base station from the moving source base station, wait for to the mobile radio station transmission being transferred to the data that move destination base station from the higher level station.Therefore, because will be at process stipulated time (Waiting Time: the stand-by period) wait for the arrival of these data before, the problem that communication delay increases and throughput descends takes place thereby exist.But, as stated,,, thus, reduced communication delay even then take place also can the data that receive from the higher level station be transferred to mobile radio station rapidly under the situation of delay in data forwarding (forwarding) if carry out the jump transmission of data.Therefore, compare the communication quality before and after guaranteeing in high quality to switch with existing method.
(B) the 1st embodiment
Fig. 1 is the key diagram of the 1st embodiment, its to the situation row that comes additional sequence information with the unit of being grouped into explanation, but also can be the data of prescribed level.
Be made as before switching, in the 11a of moving source base station, store grouping n-5～n, the grouping n-5～n-2 during these divide into groups has been sent to mobile radio station 14, and grouping n-1 and n are not sent to mobile radio station 14.For example, be because grouping n-1 and n are just arrival after the radiolink that cuts off between moving source base station 11a and the mobile radio station 14, so these groupings n-1 and n are not sent to mobile radio station 14.In addition, be made as grouping n-5, n-3 in the grouping that mobile radio station sends and be not moved station 14 and correctly receive (NACK), and grouping n-4, n-2 are normally received (ACK).Therefore, mobile radio station 14 is preserved grouping n-4, n-2, and does not preserve grouping n-5, n-2.
Under this state, when switching, moving source base station 11a transmits grouping n-1, the n that (forwarding) is not moved the station 14 normal grouping n-5 that receive and n-3 and not transmission to mobile destination base station 11b.Under the situation that below explanation is transmitted dividing into groups, but be not limited to such example.
In addition, the higher level stands and 2 after switching, sends two grouping m～m+1 that will issue mobile radio station to moving destination base station 11b.Delay has taken place in the forwarding (forwarding) of in addition, establishing grouping n-5～n.
If moving destination base station 11b stood from the higher level before 11a transmits the n-5 that divides into groups, n-3, n-1～n from the moving source base station and 2 receives grouping m, m+1; Then this grouping m that receives from the higher level station, m+1 are added jump identification code F, and earlier their are sent (transmission of jumping) to mobile radio station 14.
The packet stores of having added jump identification code F that mobile radio station 14 will receive from the base station and is discharged their outside the object of handling that reorders to buffer BF2.(A) expression mobile radio station 14 of Fig. 1 is preserved grouping m, m+1 in buffer BF2, and before switching, in buffer BF1, preserves the grouping n-4 that receives, the state of n-2.
Then, move destination base station 11b and send grouping n-5, n-3, the n-1～n that the 11a forwarding comes from the moving source base station to mobile radio station.Mobile radio station 14 will be kept at the buffer BF1 from these groupings n-5, n-3, the n-1～n that mobile destination base station 11b receives; Carry out these processing of reordering (with reference to Fig. 1 (B)), and give upper layer with packet delivery according to the serial number order at the grouping that receives after the switching and the grouping n-4 that before switching, receives, n-2.In addition,, finish to reorder processings, give upper layer the packet delivery that hereto receives and arrange again when having passed through the stipulated time when not receiving the grouping of serial number yet.
In addition, when transmitting, can transmit all to mobile destination base station from the moving source base station and divide into groups, also can only transmit a part of data (user data part) that comprise in dividing into groups.Preferably, to transmitting data additional sequence information.
In addition; In Fig. 1; Sequence number (order information) m, m+1 are distributed to the grouping of having carried out the jump transmission, can distribute sequence number arbitrarily, can also add the numbering that repeats with the sequence number that the grouping of transmitting is added but move destination base station 11b; In addition, also can adopt unduplicated numbering.
The jump identification code
As example, used " type " field of 3 bits that comprise in the header of PDCP PDU to the additional jump identification code F that divides into groups.That is, in this " type " field, be jump identification code F with new type number definition, and with the additional grouping of giving the transmission of jumping of this type numbering.Fig. 2 is the form example of PDCP PDU, (A) is the form example of no header, (B) is the form example of the not sequence number of additional PDCP PDU, (C) with (D) be that to have added the form of sequence number of PDCPPDU routine.In (C) and form (D), in header HD, defined type field and PID field, represent the classification of PDCP PDU with the type field.The PID field is the field of expression to the compression classification of the data that comprise in the Data portion.In the type field, stipulated " type=000 " and " type=001 ", and not regulation and use " type=010～111 ".Therefore, for example utilize " type=010 ", as the type numbering (jump identification code) that is used to discern the PDCP PDU that has carried out the jump transmission.
The PDCP layer before and after switching and the processing of rlc layer
Fig. 3 is the key diagram that switches the packet transaction of preceding PDCP layer and rlc layer.Moving source base station 11b is stored in (Fig. 3 (A)) in the buffer with the grouping n-5～n-2 of PDCP layer; Shown in (B); In rlc layer, packet fragmentation is become a plurality of data; To the sequence number I of the additional rlc layer of each partition data, I+1, I+2 ..., I+6, send to mobile radio station 14 then.Mobile radio station 14 is directed against the sequential control of PDCP layer in rlc layer before switching.In Fig. 3, be made as mobile radio station 14 and normally do not receive partition data I, I+4, I+5, that is, and grouping n-5, n-3, but normally received grouping n-4, n-2.
Fig. 4 is the key diagram of the packet transaction of PDCP layer and rlc layer after switching, and has specifically illustrated the treatment state of PDCP layer and rlc layer.In addition, though mobile radio station 14 is the sequential controls that before switching, in rlc layer, are directed against the PDCP layer, is defined in the switching back rlc layer is carried out initialization.Therefore, the PDCP layer is transferred in the processing of sequential control, and mobile radio station 14 is carried out switching sequence in the PDCP layer.
Mobile radio station 14 starts the end that timer reorders with judgement when reordering.
Owing to take the lead in arriving from the higher level 2 grouping m, the m+1 that receive that stand, therefore move destination base station 11b to this m that divides into groups, the additional jump identification code F of m+1, and give mobile radio station 14 with its transmission (transmission of jumping) earlier.The packet stores of having added jump identification code F that mobile radio station 14 will receive from the base station and is got rid of their outside the object of handling that reorders among buffer BF2.Afterwards, 14 pairs of mobile radio stations are from the grouping n-5, n-3, the n-1～n that move destination base station 11b and receive and the grouping n-4, the n-2 that before switching, receive processings of reordering, and pass to upper layer.
In addition, passed through stipulated time T when timer MThe time, mobile radio station 14 finishes to reorder processing, even divide into groups to exist disappearance, the grouping that also still will receive sends back to upper layer.
Window control
Guard against in the data conditions that has arrived more than the data volume that can allow, mobile radio station 14 generates the window of buffer size in inside, and when reordering processing, carries out following window control.In the example of Fig. 4, the left end of window when initial the numbering n-5 that arrives of expectation, the definite numbering n-2 of data volume (the windows cache device is big or small) that the right-hand member of window is served as reasons and can be allowed.Mobile radio station is not to having added the packet applications window treatments of jump identification code F.
Under initial condition (Window state (0)); When receiving the grouping of being expected (n-5), mobile radio station 14 goes forward side by side the rearrangement preface when handling; Window state is shown in (1), and therefore, mobile radio station is transmitted grouping (n-5) and the grouping of being expected (n-4) continuous with it to upper layer.Then, Window state becomes the state shown in (2), and when mobile radio station 14 receives the grouping of being expected (n-3) and reorders when handling under this state, Window state becomes the state shown in (3).Therefore, mobile radio station is transmitted grouping (n-3) and the grouping of being expected (n-2) continuous with it to upper layer.Then, Window state becomes the state shown in (4), and mobile radio station 14 is waited for the reception of grouping (n-1), n under this state, if at setting-up time T MReceive grouping (n-1), n, then they are transmitted to upper layer.But, if at setting-up time T MDuring in do not receive grouping (n-1), n, then mobile radio station 14 will be kept among the buffer BF2 grouping m and after packet forward give upper layer, transfer to the common control before switching.As stated, divide into groups to carry out above-mentioned window control with foreclosing, can carry out the processing of reordering to grouping n-5～grouping n through jumping.
In addition, in window control, mobile radio station 14 abandons this grouping under the situation of the grouping that receives the sequence number littler than the sequence number of window left end.In addition; Mobile radio station 14 is when receiving the grouping of the sequence number bigger than the sequence number of window right-hand member; The sequence number of this window right-hand member is made as the sequence number of this grouping; The sequence number of window left end is changed to the numbering by the decision of windows cache device size, and the reception packet delivery that will eject in this window ranges is simultaneously given upper layer.
If divide into groups also to have used window treatments to jumping, then in the moment that receives grouping m, it is n-2 that Window state for example becomes the window left end, and the window right-hand member is m.In this case, the grouping n-5 that mobile radio station is abandoned not receiving as yet, the reception of n-3 will receive grouping n-4, n-2 and be transmitted to upper layer.Then, the sequence number of window right-hand member is set at m, the sequence number of window left end is set at the numbering n-1 by the window size decision, wait for afterwards grouping n-1, grouping n, grouping n+1 ..., grouping m-1 arrival.But among this, grouping n+1～grouping m-1 is in fact non-existent grouping, therefore, has vainly waited for the reception of these groupings, causes packet transaction generation problem.
The structure of base station
Fig. 5 is the structure chart of base station, shows buffer memory portion, scheduling portion, receiving and transmitting part and control part.
Buffer memory portion 21 is used to store the memory of standing the grouping that gets into and transmitting the grouping that comes from adjacent base station (moving source base station) from the higher level.In the figure, on physical structure, be provided with two buffer 21a, 21b, a memory only be set on the physical structure, cut apart the apparatus structure of utilization from software but also can be employed in.
The mobile radio station of wireless transmission is selected to carry out by scheduling portion 22 from a plurality of mobile radio stations of communicating by letter, take out the grouping that is stored in this base station in the buffer, sends back to receiving and transmitting part.23 pairs of groupings that come from the transmission of scheduling portion of receiving and transmitting part are encoded, modulation treatment, and utilize wireless mode to carry out actual transfer of data.In addition, receive the control signal of sending from mobile radio station and various data and it is carried out demodulation.
Control part 24 has the 24a of buffer management portion, HO control part 24b and measures control part 24c.The 24a of buffer management portion manages the various groupings that are stored in the buffer 21.If when switching, carry out the data handing-over, then to give mobile destination base station 11b with the packet forward that does not obtain normal confirmation of receipt (ACK) that is stored among the buffer 21b at least.On the other hand; Causing the arrival of the grouping that the 11a forwarding comes from the moving source base station that delay has taken place owing to the data handing-over; Under thereby the transmission of jumping is stood the situation of 2 groupings that receive from the higher level, in the type field of the header of this jumps grouping, charge to " type=010 ".
HO control part 24b carries out the switching controls utilize Figure 23 to explain, measures control part 24c and collects the various mensuration information of sending from mobile radio station, for example the wireless quality CQI of mobile radio station (Channel Quality Information) etc.
The structure of mobile radio station
Fig. 6 is the structure chart of mobile radio station, shows receiving and transmitting part 31, buffer memory portion 32, resets prelude 33 and control part 34.The transmitting-receiving with control information of dividing into groups of the receiving and transmitting part of receiving and transmitting part 31 and base station.Buffer memory portion 32 can not divide into groups to construct under the situation of RLC PDU according to the lower layer that receives, and is saved in and can constructs till this RLC PDU, when RLC PDU constructs successfully, removes header, passes to as RLC SDU (PDCP PDU) and resets prelude 33.Resetting prelude 33 has and is used for PDCP PDU being arranged again and it being passed to the function of upper layer according to the sequence number order.Reset prelude 33 when disappearance takes place the sequence number that detects PDCP PDU, PDCP PDU afterwards is kept in the internal memory, till receiving the continuous PDCP PDU of sequence number.But, passing through stipulated time this PDCP PDU still under the situation of no show, reset prelude processings that stop to reorder, all PDCP PDU that stored are passed to upper layer.In addition, reset prelude 33 when reordering, carry out window control, make handled data volume be no more than allowance.
Control part 34 has determination part 34a, the 34b of management department and resend the 34c of management department reorders.Determination part 34a measures the various mensuration information that send to the base station.For example, measure the wireless quality CQI (Channel Quality Information) of mobile radio station.The 34b of management department that reorders controls the portion of reordering 33, has taken place at the PDCP PDU that rearrangement prelude 33 is preserved under the situation of numbering disappearance, and the arrival of numbering continuous PDCP PDU is waited in indication.In addition; When the arrival stand-by period of this grouping had been passed through the stipulated time, indication was reset prelude 33 and is stopped to reorder, and the header of all PDCP PDU that preserved is removed in indication; Pass to upper layer as PDCP SDU, thereby be in the state that can receive new PDCP PDU.Then, the maximum sequence number that the 34b of management department that reorders will receive so far is set at the sequence number of window right-hand member, and through considering that window size decides and set the sequence number of window left end.Here, if exist the sequence number reception littler to divide into groups, then directly give upper layer with this packet forward than the sequence number of window left end.Resend the 34c of management department when resending control, send to the base station through receiving and transmitting part according to the represented path of dotted line and resend request signal.
Move the action of destination base station
Fig. 7 is the action flow chart of the mobile destination base station of the 1st embodiment.
The switch control portion 24b that moves destination base station 11b is when 11a receives HO request (comprising mobile radio station ID and QoS information etc.) from the moving source base station (step 201); Call out access control according to these information, judge whether to allow to insert mobile radio station (step 202).If do not allow then carry out reprocessing (step 213), and finish switching controls.
On the other hand, switch control portion 24b replys HO request response (step 203) allowing to insert under the situation of mobile radio station to moving source base station 11a.Then, move destination base station 11b and wait for that 11a transmits the grouping of coming from the moving source base station, afterwards, buffer memory portion 21 stores (step 204) with it when receiving the grouping that the 11a forwarding comes from the moving source base station.
Under this state, switch control portion 24b stands to the higher level and 12 to send the report (step 206) that HO accomplish when receiving the report that HO accomplishes from mobile radio station 14 (step 205).The higher level stands in and receives when switching the report of accomplishing, and 11a switches to mobile destination base station 11b from the moving source base station with the transmission packets path, and replys HO to mobile destination base station 11b and accomplish response.The switch control portion 24b that moves destination base station 11b 12 receives HO when accomplishing response (step 207) standing from the higher level, and 22 indications begin to send divide into groups (step 208) to scheduling portion.
Thus, whether 22 inspections of scheduling portion need divide into groups to jump and transmit (step 209), if do not need, then preferentially send the grouping (step 210) that the 11a forwarding comes from the moving source base station to mobile radio station 14.But, if thereby the transmission of jumping of need dividing into groups appears postponing from the forwarding of the grouping of moving source base station 11a, and then scheduling portion 22 carries out the stand jump transmission of 12 groupings that receive from the higher level.
When carrying out the jump transmission; The classification number of type field of grouping of transmission of will jumping is set at 010 (type=010); Making mobile radio station 14 can identify this grouping is the transmission grouping (step 211) of jumping, and is somebody's turn to do divide into groups (step 210) to mobile radio station 14 transmission then.
With above processing concurrently, switch control portion 24b sends resource release message (step 212) to moving source base station 11a, carries out reprocessing (step 213), finishes switching controls.
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 mensuration control part 24a of moving source base station 11a through measuring report when mobile radio station 14 receives receiving status information (step 251); Judge whether that according to this receiving status information needs switch (Hand Over:OH) (step 252); If need not switch, then turn back to initial point.
But when confirming as need switch HO the time, switch control portion 24b confirms to move destination base station 11b according to the content of measuring report, moves destination base station 11b transmission handoff request (step 253) to this.
Then; Receiving when moving the HO response message that destination base station 11b sends (step 254); HO control part 24b sends HO Indication message (step 255) to mobile radio station 14, and the indication cache management 24a of portion transmits (packet forward) to mobile destination base station 11b and remains in the grouping in the buffer 21.Thus, the 24a of cache management portion path by a dotted line is to moving that destination base station 11b transmits the grouping that does not send to mobile radio station 14 that exists among (forwarding) buffer 21b or not by the grouping of normal reception (NACK grouping) (step 256).Afterwards, receive, carry out resource and discharge (step 258) from moving the resource release message (step 257) that destination base station 11b sends.
The action of mobile radio station
Fig. 9 is the action flow chart of mobile radio station.
The determination part 34a of mobile radio station 14 is through measuring report to (steps 271) such as moving source base station 11a notice accepting states.Afterwards; Control part 34 is waited for the HO Indication message that 11a sends from the moving source base station; When receiving the HO Indication message (step 272); Guarantee to keep (step 273) synchronously through the L1/L2 signaling, after having guaranteed synchronously, switch the report of accomplishing (step 274) to moving destination base station 11b transmission with mobile destination base station 11b.Then; Whether control part 34 checks received grouping for jumping over grouping, and in other words, whether inspection is the grouping (step 275) of type=010; Divide into groups if jump; Then its eliminating is kept in the buffer 32 outside the object that reorders and with it, through behind the setting-up time, removes header and set PDCP SDU packet delivery for and give upper layer (step 276).On the other hand, divide into groups, then carry out and reorder, arrange again in order, pass to upper layer (step 277) as PDCP SDU then if not jumping.
Figure 10 is the handling process that reorders of mobile radio station.
When the receiving and transmitting part 31 of mobile radio station receives the lower layer grouping from moving destination base station 11b (step 301); Can the 34b of management department that reorder inspection construct RLC PDU (step 302); In the time can not constructing, whether inspection has passed through setting-up time (step 303), when not passing through setting-up time as yet; This lower layer packet stores in buffer 32 (step 304), is carried out step 301 and processing afterwards thereof.When receiving lower layer when having passed through setting-up time after dividing into groups and still can not construct RLC PDU, deletion lower layer grouping (step 305) from buffer.
On the other hand, in the time in step 302, can using the lower layer that receives to divide into groups to construct RLC PDU, this RLC PDU is passed to rearrangement prelude 33 (step 306) as RLC SDU (PDCP PDU).Reset prelude 33 when receiving RLC SDU (PDCP PDU); Whether inspection exists sequence number disappearance (step 307); If there is not disappearance in sequence number but is continuous, the header of then deleting this RLC SDU (PDCP PDU) is set into PDCP SDU and passes to upper layer (step 311).But if there is disappearance in sequence number, prelude 33 is reset in the 34b of management department that then reorders indication makes it preserve PDCP PDU (step 308).Thus, reset prelude 33 and preserve PDCP PDU, and whether inspection receives the continuous RLC SDU of sequence number (PDCP PDU) (step 309).If receive the continuous RLC SDU of sequence number (PDCP PDU), then this RLC SDU (PDCP PDU) is passed to upper layer as PDCP SDU, and the PDCP PDU that is preserved is passed to upper layer (step 311).
In addition, if in step 309, do not receive the continuous RLC SDU of sequence number (PDCP PDU), then keep watch on whether passed through scheduled time T M(step 310) be not if pass through scheduled time T as yet MThen repeating step 308 and processing afterwards thereof, and when having passed through setting-up time T MThe time, even sequence number is discontinuous, also the PDCPPDU that is preserved is passed to upper layer (step 311).
As stated; According to the 1st execution mode; Can 12 divide into groups as jumping, under situation about not waiting for, it is transferred to mobile radio station 14 standing, thereby can eliminate the time of delay of data, can improve the throughput of entire system from the higher level to moving the grouping that destination base station 11b transmission comes.In addition, mobile radio station 14 is got rid of to jump from the object of control (sequential control) of reordering and is divided into groups, and sequential control is carried out in the grouping of jumping outside dividing into groups, and gives last stage arrangement according to the sequence number order with packet delivery.Its result is even mobile radio station only has a sequential control function, the sequential control that also can divide into groups.
(C) the 2nd embodiment
In the 1st embodiment, mobile radio station 14 is at setting-up time T MThe processing of reordering during this time is when having passed through setting-up time T MThe time, finish to reorder processing (step 310 among Figure 10).Therefore, mobile radio station 14 is receiving from moving source base station 11a after all groupings of moving destination base station 11b forwarding, if still do not pass through setting-up time T M, then continue to carry out the processing of reordering.At this; In the 2nd embodiment; In order to make mobile radio station 14 can identify the last grouping in the process object that reorders; Move destination base station 11b and divide into groups (last grouping) additional discriminators and be transferred to mobile radio station stipulating, mobile radio station 14 is when receiving this last grouping, even do not pass through setting-up time T as yet MProcessing immediately also can finish to reorder.
Figure 11 is the key diagram of the 2nd embodiment, is made as before switching, in the 11a of moving source base station, stores grouping n-5～n, and the grouping n-5～n-2 during these divide into groups has been sent to mobile radio station 14, but grouping n-1 and n are not sent to mobile radio station 14.For example, because grouping n-1 and n are just arrival after the radiolink that cuts off between moving source base station 11a and the mobile radio station 14, so these groupings n-1 and n are not sent to mobile radio station 14.In addition, be made as grouping n-5, n-3 in the grouping that mobile radio station sends and be not moved station 14 and correctly receive (NACK), and grouping n-4, n-2 are normally received (ACK).Therefore, mobile radio station 14 is preserved grouping n-4, n-2, and does not preserve grouping n-5, n-3.
Under this state, when switching, moving source base station 11a transmits grouping n-1, the n that (forwarding) is not moved the station 14 normal grouping n-5 that receive and n-3 and do not send to moving destination base station 11b.In addition, the higher level stands and 12 after switching, sends two grouping m～m+1 to mobile destination base station 11b.Delay has taken place in the forwarding (forwarding) of wherein, establishing grouping n-5～n.
If moving destination base station 11b stood from the higher level before 11a transmits the n-5 that divides into groups, n-3, n-1～n from the moving source base station and 12 receives grouping m, m+1; The then additional jump identification code F of grouping m, m+1 to receiving from this higher level station, and elder generation sends their (transmission of jumping) and gives mobile radio station 14.The packet stores of having added jump identification code F that mobile radio station 14 will receive from the base station and is got rid of the object that they are handled from reordering to buffer BF2.(A) expression mobile radio station 14 of Figure 11 is preserved grouping m, m+1 in buffer BF2, and before switching, in buffer BF1, preserves the grouping n-4 that receives, the state of n-2.
Move destination base station 11b and passing through scheduled time T WTo transmit the grouping that comes till (being called Waiting Time (stand-by period)) and send to mobile radio station, and if passed through the stand-by period, transmit the grouping that comes and also can it be abandoned even then receive.Therefore, mobile base station 11b is in that 11a transmits grouping n-5, n-3, the n-1 of coming through receiving before the stand-by period from the moving source base station, and is kept among the buffer BF and with it and is transferred to mobile radio station one by one.And, be located at from the moving source base station that 11a receives grouping n and the stand-by period is then during stage that is not transferred to mobile radio station as yet.In this case, moving destination base station 11b is to transmit the identifier (L) of the last grouping that comes to grouping n additional representation, and is transferred to mobile radio station 14.
Mobile radio station 14 will be kept at the buffer BF1 from grouping n-5, n-3, n-1, the n that mobile destination base station 11b receives, and shown in Figure 11 (B), grouping n-4, the n-2 that receives before these groupings and the switching is carried out the processing of reordering, and arranges again.In addition, when detecting the identifier (L) of the additional grouping n of giving, be judged as and transmit end, even the setting-up time T that reorders MNot not then as yet, the packet delivery that also will reorder is given upper layer, finishes to reorder processing.
Be stand-by period situation then before sending grouping n above, grouping n be transferred to stand-by period situation then in the stage after the mobile radio station but also exist in.In this case, moving destination base station 11b is identifiers (L) of last grouping to the 12 grouping m+2 additional representation that receive of standing from the higher level, and is transferred to mobile radio station 14.The mobile radio station 14 that receives the last grouping that has added this identifier is judged as to transmit and finishes, even the setting-up time T that reorders MProcessing as yet immediately then can not finish to reorder yet.
In addition, though received grouping n-3 through forwarding, also exist in stand-by period in the stage situation then that does not receive grouping n-1, n.In this case, moving destination base station 11b is last identifier (L) of dividing into groups to grouping n-3 additional representation, and is transferred to mobile radio station 14.Mobile radio station 14 detects the last grouping that added this identifier (L) and the processing that finishes to reorder.
Last packet identification sign indicating number L
When to the grouping additional representation being last identifier (last packet identification sign indicating number), use " type " field of 3 bits that comprise in the header of PDCP PDU.That is, in this " type " field, be last packet identification sign indicating number L, and this type numbering is distributed to the grouping of sending at first through after the stand-by period new type number definition.Figure 12 is the form example of PDCP PDU, (A) is the form example of no header, (B) is the form example of the not sequence number of additional PDCP PDU, (C) with (D) be that to have added the form of sequence number of PDCP PDU routine.In (C) and form (D), in header HD, defined type field and PID field, represent the classification of PDCP PDU with the type field.In the type field, stipulated " type=000 " and " type=001 ", and not regulation and use " type=010～111 ".Therefore, for example utilize " type=011 ", as being used to be identified in divide into groups (last grouping) type number through the PDCPPDU that sends at first after the stand-by period.
The processing of PDCP layer and rlc layer
Figure 13, Figure 14 are the key diagrams of the packet transaction of PDCP layer and rlc layer after switching.
Figure 13 representes the situation that the grouping n of subtend mobile radio station transmission has added last packet identification sign indicating number L.Mobile radio station 14 starts the end that timer reorders with judgement when reordering.Here, with setting-up time T MSet under the situation of bigger value, with grouping n whether be the last grouping of being transmitted irrespectively, the processing of proceeding to reorder is at setting-up time T MCan not be then with packeting back to upper layer.But in the 2nd embodiment, mobile radio station 14 finishes to reorder when receiving the grouping n (last grouping) that has added last packet identification sign indicating number L immediately, and all PDCP PDU are packeted back to upper layer.
In addition, guard against in the data conditions that has arrived more than the data volume that can allow, mobile radio station 14 carries out window control when reordering.The left end of window by the numbering n-5 that arrives of expectation, the right-hand member of window is as the value of the upper limit of the data volume that can allow (being n among the figure).But, shown in embodiment 1, do not have packet applications window treatments to " type=010 ".Through this processing, can carry out reordering to grouping n-5～grouping n.
Figure 14 representes grouping m+2 has been added the situation of last packet identification sign indicating number L.Mobile radio station 14 is in the moment that receives grouping m+2 (last grouping), even setting-up time T MNot not then as yet, also can finish immediately to reorder, all PDCP PDU that received are packeted back to higher level's layer.In addition, likewise carry out window control with Figure 13.
Move the action of 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 the identical step of step give identical label.Base station among the 2nd embodiment, mobile radio station have Fig. 5, structure shown in Figure 6.
The switch control portion 24b that moves destination base station 11b calls out access control according to these information when 11a receives HO request (comprising mobile radio station ID and QoS information etc.) from the moving source base station, judge whether to allow to insert mobile radio station.If do not allow, then carry out reprocessing, finish switching controls (step 201～202,213) then.
On the other hand, allow to insert under the situation of mobile radio station 14, reply the HO request response to moving source base station 11a, and begin the elapsed time is carried out timing at switch control portion 24b.Then, move destination base station 11b and wait for that 11a transmits the grouping of coming from the moving source base station, and with this packet memory (step 203～204) in buffer memory portion 21.
Under this state, switch control portion 24b is when receiving the report that HO accomplishes from mobile radio station 14, and the report that HO is accomplished sends to higher level 12 (step 205～206) of standing.The higher level stands 12 when receiving the report of switching completion, and 11a switches to mobile destination base station 11b from the moving source base station with packet transmission path, replys HO to mobile destination base station and accomplishes response.The switch control portion 24b that moves destination base station 11b is when receiving HO completion response from the higher level station, indication scheduling portion 22 begins to send divide into groups (step 207～208).
Then, whether scheduling portion 22 supervision elapsed time surpassed setting-up time T WPromptly; Then whether the stand-by period (step 501), if the stand-by period is not then as yet, then checks the jump transmission (step 209) that whether need divide into groups; If do not need, then transmit the grouping that comes and begin it is preferentially sent to mobile radio station 14 (step 210) from mobile destination base station 11a.But, thereby when the jump transmission that transmit to occur postpones to divide into groups, scheduling portion 22 carries out the stand jump transmission of 22 groupings that receive from the higher level.In order to carry out the transmission of jumping, the classification number of the type field of the packet header of the transmission of will jumping is set at 010 (type=010), and making mobile radio station 14 can identify this grouping is to jump to divide into groups, and gives mobile radio station (step 210) with this transmitted in packets then.
With above processing concurrently, switch control portion 24b sends resource release message (step 212) to moving source base station 11a, returns step 501, the inspection stand-by period whether then, if not then as yet, then repeated execution of steps 209 and after processing.
On the other hand, if in step 501 stand-by period then set " 011 " for type number of the grouping that then will transmit at once then in the stand-by period.That is, after then at once to the additional last packet identification sign indicating number L of the grouping that will transmit, and will divide into groups (last grouping) be transferred to mobile radio station (step 502～503), carries out reprocessing then, end switching controls (212～213).
In addition; In step 502; In order to identify the last grouping that has added last packet identification sign indicating number L is that 11a transmits the grouping of coming from the moving source base station; Still from higher level's 12 groupings of receiving of standing, be set at " 011 " with type number under for the former situation, be set at " 100 " under the latter's the situation with type number.The processing of reordering of the mobile radio station of stating after so just making 14 becomes easy.
The action of mobile radio station
Figure 16 is the action flow chart of mobile radio station, to Fig. 8 in the identical step of motion flow mark same numeral.The determination part 34a of mobile radio station notifies accepting state etc. through measuring report to moving source base station 11a.Afterwards; Control part 34 is waited for the HO Indication message that sends from the moving source base station; When receiving the HO Indication message; Guarantee to keep synchronously through the L1/L2 signaling, after having guaranteed synchronously, switch the report of accomplishing (step 271～274) to moving the destination base station transmission with mobile destination base station 11b.
Then; Whether control part 34 checks received grouping for jumping over grouping, and in other words, whether inspection is the grouping (step 600) of type=010; Divide into groups if jump, the eliminating of then should dividing into groups is kept in the buffer 32 (step 601) outside the object that reorders and with it.
On the other hand, divide into groups if not jumping, check then whether received grouping is last grouping, in other words, whether inspection is the grouping (step 602) of type=011.If not last grouping, then begin to reorder, and in order PDCP PDU is divided into groups to arrange again, generate PDCP SDU and pass to upper layer (step 603).
Then, inspection scheduled time T MThen whether (step 604) if setting-up time T MNot not then as yet, if then repeating step 600 and processing afterwards is and setting-up time T MThen, then finish to reorder processings, deletion header and generate PDCP SDU from the PDCP PDU that does not pass to upper layer as yet divides into groups then, and it is passed to upper layer (step 605).Then, give upper layer and end process (step 606) with the packet delivery outside the object that reorders.
On the other hand, in step 602,, then stop the processing (step 607) of reordering at once if received grouping is last grouping.At this moment,, then generate PDCP SDU grouping and pass to upper layer, stop to reorder through this last grouping if last grouping is to transmit the grouping of coming.In addition, if last grouping is from higher level's 12 groupings of receiving of standing, then stop at once reordering, the grouping that this is last is connected on the last of grouping outside the object that reorders.Then, give upper layer and end process (step 606) with the packet delivery outside the object that reorders.
As stated, according to the 2nd embodiment, mobile radio station is to detect with reference to last packet identification sign indicating number to transmit situation about finishing, and can stop immediately reordering thus.Therefore, can eliminate the time of delay of data, improve the throughput of entire system.
(D) the 3rd embodiment
Shown order information so far (sequence number n, m) is the simple numbering of utilizing for the ease of explanation, and in fact order information is additional by the base station.
Shown in preceding, in the LTE communication system, forwarding is to implement according to the data unit of PDCP SDU.Therefore, taking place under the situation about transmitting, can't send Sequence Number field to mobile destination base station 11b by 11a from the moving source base station, thereby need come notification sequence number (Sequence Number) someway.
In the present embodiment, moving source base station 11a notifies sequence number to mobile destination base station with PDCP SDU data, and mobile destination base station is transmitted the PDCP SDU data (grouping) of coming based on this sequence number with additional the giving of this sequence number.
Figure 17 attaches in corresponding PDCP SDU data (groupings) (in being with) with the sequence number of PDCP PDU, and the example of notifying through datum plane (U-Plane).Though in Figure 17, only show the PDCPSDU data and accompany the sequence number SN of these data, for these PDCP SDU data as a component group, also need add control information (header information).Moving source base station 11a when transmitting PDCP SDU data at every turn; The sequence number SN in these PDCP SDU data is attached according to the form notice of Figure 17 in the capital, moves destination base station 11b and based on this sequence number additional the giving of this sequence number is transmitted the PDCP SDU data (grouping) of coming.
That is, under the situation of Figure 17, moving source base station 11a at first transmits sequence number n-5 and initial PDCP SDU data through datum plane U-plane.Then, transmit sequence number n-3 and next PDCP SDU data through U-plane.Afterwards, transmit from the higher level stand 12 receive PDCP SDU data n-1, n the time, likewise through U-plane to mobile destination base station 11b forwarding sequence number PDCP SDU data and sequence number thereof.In mobile destination base station 11b owing to receive sequence number n-5, n-3, n-1, n through U-plane notice, can identify thus change the sequence number of data sent.
Figure 18 is that the sequence number SN with PDCP PDU attaches in corresponding PDCP SDU data (in band) and notifies through U-Plane, and moving source base station 11a will fail to confirm the example notified through control plane (C-plane) as next SN by the sequence number of the PDCP SDU data of the normal reception of mobile radio station simultaneously.In the transfer sequence figure of Figure 19, will be shown " SN handing-over " through sequence number (next SN) notification list that this C-plane carries out.The SN handing-over can be carried out the HO request to mobile destination base station 11b with moving source base station 11a and side by side carry out.
In the situation of Figure 18, moving source base station 11a at first transmits sequence number n-5 and initial PDCP SDU data through U-plane.Then, transmit sequence number n-3 and next PDCP SDU data through U-plane.In addition, moving source base station 11a only will fail to confirm that the sequence number n-5 by the normal PDCP SDU that receives of mobile radio station notifies to mobile destination base station 11b (SN handing-over) through C-plane as next SN simultaneously.Afterwards, moving source base station 11a transmit from the higher level stand 12 receive PDCP SDU data n-1, n the time, likewise via U-plane to mobile destination 11b forwarding PDCP SDU data and sequence number thereof.Move destination base station 11b and receive sequence number n-5 that notifies through C-plane and sequence number n-5, n-3, n-1, the n that passes through the U-plane notice; But it is because bigger than the sequence number that passes through the C-plane notice through the sequence number of U-plane notice; Therefore based on this sequence number through the U-plane notice to after this PDCP SDU data appended sequence number, and be transferred to mobile radio station.That is, move destination base station 11b and ignore sequence number n-5 through the C-plane notice.
Figure 20 is the example that does not have the PDCP SDU data conditions that will transmit fully.
As next SN, moving source base station 11a fails to confirm by the normal sequence number n+1 that receives of mobile radio station to moving destination base station 11b notice via C-plane.If 11a does not receive the PDCP SDU following stand-by period of data conditions then in the moving source base station, then move destination base station 11b based on the sequence number through the C-plane notice to after this PDCP SDU data appended sequence number, and be transferred to mobile radio station.That is, moving destination base station 11b will be made as n+1 and be transferred to mobile radio station from the stand sequence number of the 12 grouping m that receive of higher level.
More than, according to the present invention, can be with dividing into groups as jumping and promptly be transferred to mobile radio station from higher level station to moving grouping that the destination base station transmission comes, the time of delay that can eliminate data, improve the throughput of entire system.In addition, mobile radio station is got rid of to jump from the object of control (sequential control) of reordering and is divided into groups, and sequential control is carried out in the grouping of jumping outside dividing into groups, and gives epigyny device according to the sequence number order with packet delivery.Its result, even mobile radio station only has a sequential control function, the sequential control that the object that also can correctly reorder divides into groups.
In addition, according to the present invention, mobile radio station is to detect with reference to last packet identification sign indicating number to transmit situation about finishing, and can stop immediately reordering thus.Therefore, can eliminate the time of delay of data, improve the throughput of entire system.

Claims (3)

1. a mobile radio station is characterized in that,
This mobile radio station is from following mobile destination base station receive sequence number, and this moves destination base station is with the base station of the sequence number that receives from the moving source base station as the sequence number of the grouping that receives from the higher level station.
2. a wireless communication system is characterized in that,
This wireless communication system has: moving source base station, mobile destination base station and mobile radio station,
Said mobile radio station is from following said mobile destination base station receive sequence number, and this moves destination base station is with the base station of the sequence number that receives from said moving source base station as the sequence number of the grouping that receives from the higher level station.
3. a base station is characterized in that,
The sequence number that this base station will receive from the moving source base station is as the sequence number that moves the grouping that destination base station receives from the higher level station.
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