CN104080131A - Communication system - Google Patents
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- CN104080131A CN104080131A CN201410327038.XA CN201410327038A CN104080131A CN 104080131 A CN104080131 A CN 104080131A CN 201410327038 A CN201410327038 A CN 201410327038A CN 104080131 A CN104080131 A CN 104080131A
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Abstract
The invention provides a communication system. A base station is arranged in the communication system so as to send packets to which sequence numbers representing the sequence are attached to a mobile station (14), the mobile station is arranged to connect the packets according to the sequence, and executes switching in the communication system, the communication system comprises a switching source base station (11a) with a control portion (24), the switching source base station (11a) sends indicating information to the mobile station, whether the indicating information is set or not is determined by judging whether packet forwarding exists or not, the mobile station is provided with a receiving portion (31) and a control portion (34), the receiving portion (31) receives the indicating information set when packet forwarding exists from the switching source base station, and the control portion (34) controls connection of the packets received from the switching target base station (11b) during switching in sequence according to the indicating information which is set when packet forwarding exists.
Description
The application, based on the 42nd article of proposition of Patent Law detailed rules for the implementation, is to be the divisional application of the application for a patent for invention " base station, mobile radio station, communication system and rearrangement method thereof " that March 22, application number were 200780052045.1 in 2007 applying date.
Technical field
The present invention relates to communication system, particularly relate to a grouping that is attached with the sequence number of order of representation sends to mobile radio station and mobile radio station, grouping rearranged by numeric order communication system from base station.
Background technology
For the mobile communication system of portable phone etc., third generation mode based on CDMA mode starts to serve at present, and to realizing next generation mobile communication system (the LTE:Long Term Evolution of more high-speed communication, Long Term Evolution) discussion just in 3GPP (3rd Generation Partnership Project, third generation partner program), carrying out in (non-patent literature 1).Therefore,, except the high speed of transfer rate, the reduction of propagation delay also becomes large problem.
For making transfer rate high speed and cutting down propagation delay, in LTE communication system, just managing that changing method is compared with existing system advanced.In mobile communication, in the time that mobile radio station moves in communication, there is the switching (handover) of the base station communicating according to accepting state.Therefore, make to switch advanced, this is absolutely necessary to high speed/low delay communication.In LTE communication system, because packet switching system is basic, thereby switching is direct-cut operation.In direct-cut operation, in the connection between mobile radio station and the base station of having carried out communicating by letter before movement, have no progeny, the connection between mobile radio station and mobile destination base station.Direct-cut operation, by obtain the system information of mobile destination base station before being about to switch, can switch at short notice, but the transmission interrupt status of user data occurs in switching.
Therefore,, in order to reduce propagation delay, importantly shorten and transmit interrupt status and prevent packet loss in transmission is interrupted.If the in the situation that of having there is packet loss in transmission is interrupted, the grouping of losing makes up by the packet retransmission in end-to-end, thereby propagation delay increases.
Therefore, in switching in LTE communication system, following methods has been carried out to standardization, that is: as shown in Figure 2, comprise at least grouping of mailing in the control information of this mobile radio station and the data of grouping and be handed off to mobile destination base station (non-patent literature 2) from moving source base station by being forwarded to moving source base station.But, in fact whether to carry out data handing-over and for example depend on installation.
Handing-over key diagram when Figure 19 is switching.In Figure 19 (A), 2 base station 1a, 1b for example, are connected with upper station (IAD) 2.Mobile radio station 4 is present in the 3a of 1a community, base station, current in communicating by letter with base station 1a.Under this state, as shown in Figure 19 (B), when mobile radio station 4 moves and carries out while entering in the 3b of community and switch towards the direction of base station 1b, the communication base station of mobile radio station is switched to base station 1b from base station 1a.In addition, the base station in communication before switching is called to moving source base station (source base station), the base station communicating after switching is called to mobile destination base station (target BS).
Moving source base station 1a is kept at the grouping receiving from upper station 2 in built-in buffer memory, and the grouping being kept in this buffer memory is sent to mobile radio station 4 successively.Therefore,, in the time switching generation, existence does not send to mobile radio station and is accumulated in the grouping in buffer memory.In Figure 19 (B), grouping n-2～n receives and does not send to mobile radio station and be accumulated in buffer memory before switching, sends to mobile radio station 4 after being necessary that these are grouped in to switching from mobile destination base station 1b.Therefore,, in the time that transfer sequence is carried out, moving source base station 1a is forwarded to mobile destination base station 1b grouping n-2～n.By using this retransmission method, after just switching, mobile destination base station 1b just sends to mobile radio station 4 this grouping, thereby grouping interruption does not occur.Therefore, in end-to-end, there is not packet retransmission, can carry out at a high speed and switch.In addition, above-mentioned n-2～n is the sequence number (serial number) that represents order of packets.
Figure 20 is the switching key diagram of LTE communication system, and Figure 21 is the handover process key diagram of current supposition in LTE communication system.
Mobile radio station 4 is notified by measurement report (Measurement Report) situation that need to switch HO to moving source base station 1 (1. measure and control).
Moving source base station 1 determines target BS 1b (2.HO decision) according to the content of measurement report, and handover request is sent to this moves destination base station 1b (3.HO request).HO refers to Handover (switching).Now, moving source base station 1a also sends the information (mobile radio station ID and QoS (Quality of Service, service quality) information etc.) of mobile radio station etc.Mobile destination base station 1b carries out calls barred control (4. calls barred control) according to these information.
In the time that mobile destination base station 1b has permitted accepting of mobile radio station, handoff response is transmitted back to moving source base station (5.HO response).Next, moving source base station 1a switches instruction (6.HO instruction) to mobile radio station 4, starts data (grouping) handing-over (forwarding of packets) before and after it.
Receive the mobile radio station 4 that switches instruction and guarantee to synchronize (7. synchronously guaranteeing) with mobile destination base station 1b by L1/2 signaling, when having guaranteed when synchronous, switching is completed and reports and send to mobile destination base station 1a (8.HO completes).
Thus, mobile destination base station 1b completes report switching and sends to upper station 2 (9.HO completes).Upper station 2 has switched when report when receiving, packet transfer route is switched to mobile destination base station 1b (10. path switch) from moving source base station 1a, and HO is completed to response is transmitted back to mobile destination base station 1b (11.HO completes response).Mobile destination base station 1b completes and responds the advisory that switching HO is completed to moving source base station 1a (12. resources discharge) according to HO.Afterwards, delete the path (13. resources discharge) between moving source base station 1a and upper station 2.
In above-mentioned transfer sequence is carried out, in the time having there is forwarding of packets, the grouping in mobile destination base station 1b after this forwarding, because the grouping flowing into from upper station 2 surmounts, has the possibility of serial number disorder.In the time that mobile destination base station 1b forwards a packet to mobile radio station 4 under the state of serial number disorder, in mobile radio station, can not receive grouping by correct order, thereby communication quality is deteriorated, result can not realize high-quality communication before and after switching.
Therefore in LTE communication system, in base station and mobile radio station, make to keep with the following method the order matching of grouping.Figure 22 is the key diagram of this order of packets coupling, and mobile destination base station 1b, by forwarding the packet priority coming in the grouping transmission receiving from upper station from moving source base station 1a, keeps order of packets matching.That is, before switching, in the 1a of moving source base station, accumulate and have grouping n-5～n, switch afterwards, thereby grouping n-5～n-3 is forwarded to mobile destination base station 1b and is stored in buffer memory BF.And, in the buffer memory BF of mobile destination base station 1b, store the grouping n+1, the n+2 that receive from upper station.
Mobile destination base station 1b is stored in the grouping n+1～n+2 that forwards next grouping n-5～n-3 and flow into from upper station in buffer memory, but first, first sends to mobile radio station forwarding from moving source base station 1a the grouping n-5～n-3 coming.Afterwards, forward grouping n-2～n delay from moving source base station 1a in the situation that, grouping n+1～n+2 is sent to mobile radio station.Mobile radio station 4 is carried out the grouping processing (rearrangement) that number order rearranges in order receiving.
Figure 23 is the rearrangement processing spec figure of mobile radio station.Mobile radio station 4 order in order number in Figure 22 receives grouping n-5～n-3, thereby is delivered in order upper layer.But in the moment that receives grouping n+1～n+2, grouping n-2～grouping n does not also arrive.Therefore, before receiving these groupings that do not arrive, grouping n+1～n+2 is accumulated in buffer memory BF1, is not delivered to upper layer.Then, in the situation that receiving grouping n-2～grouping n, these groupings and be that grouping n+1～n+2 is delivered to upper layer in order subsequently.In addition, the above-mentioned packet awaits time is arranged to the upper limit conventionally, for example, have the method that uses the timer of mobile radio station to carry out timing etc.
As previously discussed, in the switching in LTE communication system, the necessary technology that is treated as is reset in forwarding of packets and grouping.Here, their functional relationship is described in more detail.
Figure 24 is the key diagram that the protocol architecture between mobile radio station and network is shown.Between mobile radio station and network, at least be provided with PDCP (Packet Data Convergence Layer, grouped data convergence layer) layer, RLC (Radio Link Control, wireless link control) layer and lower layer (MAC layer/physical layer MAC/PHY).All these layers are installed in mobile radio station, and at network side, all layers are not necessarily installed in identical station.In Figure 25, show and PDCP layer has been installed in the aGW2 as upper station and the interior example that rlc layer and lower layer have been installed in base station 1.In addition, system can also be configured to: interior whole installation PDCP layers, rlc layer and lower layer in base station 1, make aGW2 only have the simple functions such as Packet routing selection function, serial number additional function.
In the example of Figure 25, between mobile radio station 4 and the aGW2 as upper station, use the data transmit-receive of PDCD layer, between user terminal 4 and base station 1, use the data transmit-receive of rlc layer.
; first the data that mail to mobile radio station for example, flow into PDCP layer and become PDCP SDU (Service Data Unit from upper layer (IP layer); service data unit); then become PDCP PDU (Protocol Data Unit, protocol Data Unit) by additional header information (serial number of PDCP layer etc.).
PDCP PDU is sent back to rlc layer and becomes RLC SDU, is then become RLC PDU by additional header information (serial number of rlc layer etc.).RLC PDU arrives the rlc layer of mobile radio station through the processing of lower layer.In this rlc layer, remove head and build again RLC SDU, then in PDCP layer, remove the head of PDCP PDU and become PDCP SDU, be sent back to upper layer.
In such protocol architecture, in LTE communication system, forwarding of packets is implemented taking RLC SDU as unit or taking PDCP SDU as unit, resets and implements taking PDCP PDU as unit.In addition, because RLC SDU and PDCP PDU are in fact identical datas, thereby in this manual, as long as do not do explanation in advance, these data are referred to as grouping, in the case of describe this grouping number, suppose that this number refers to the serial number of PDCP PDU.
The action flow chart of moving source base station apparatus when Figure 26 is switching.
Moving source base station 1a, in the situation that receiving received electric field strength etc. by measurement report from user terminal 4 (step 101), judges whether to switch HO (step 102), in the situation that not needing to switch, gets back to beginning.
But, determining that for need to switch in the situation that, moving source base station 1a determines mobile destination base station 1b according to the content of measurement report, and handover request is sent to this moves destination base station 1b (step 103).
Afterwards, receive the handoff response (step 104) sending from mobile destination base station 1b, judge whether executing data handing-over (step 105).In the case of being retained in not sending to mobile radio station grouping in buffer memory joins, carry out HO instruction to mobile radio station, and carry out the deletion (step 106) of this grouping.On the other hand, in the case of being retained in not sending to mobile radio station grouping in buffer memory joins, carry out HO instruction to mobile radio station, and carry out the forwarding (step 107) of this grouping.The grouping of the service that in addition, real-time is high as divided into groups in voip call does not join and discards.This is because discarded grouping is sending and receiving sound without delay.The grouping of the service that on the other hand, QoS is high joins.
After, receive the resource release message (step 108) of sending from mobile destination base station 1b, carry out resource and discharge (step 109).
The flow chart of mobile destination base station when Figure 27 is switching.
Mobile destination base station 1b is in the time receiving HO request (comprising mobile radio station ID and QoS information etc.) (step 121) from moving source base station 1a, carry out calls barred control according to these information, judge whether to permit the acceptance (step 122) of mobile radio station.In objectionable situation, carry out reprocessing (step 130), finish switching controls.
On the other hand, in the case of the acceptance of license mobile radio station, to moving source base station 1a loopback HO response (step 123).Next, mobile destination base station 1b is accumulated in (step 124) in buffer memory forwarding from moving source base station 1a the grouping coming, and receives HO from mobile radio station 4 and complete report (step 125).In the situation that receiving HO and completing report, mobile destination base station 1b completes report HO and sends to upper station 2 (step 126).Upper station 2 has switched when report when receiving, and packet transfer route is switched to mobile destination base station 1b from moving source base station 1a, and HO is completed to response is transmitted back to mobile destination base station 1b.Mobile destination base station 1b is in the situation that receiving HO from upper station 2 and completing response, start to send to mobile radio station the packet priority forwarding from certainly mobile destination base station 1b, sending after this grouping, starting the grouping receiving from upper station 2 to send to mobile radio station (scheduling: step 127).And parallel with step 128, mobile destination base station 1b discharges resource to send to moving source base station 1a (step 129), carries out reprocessing (step 130), finishes switching controls.
The flow chart of mobile radio station when Figure 28 is switching.
The determination part of mobile radio station 4 is notified received electric field strength etc. to moving source base station (step 151) by measurement report.After, wait for HO instruction from moving source base station 1a, in the situation that receiving HO instruction (step 152), guarantee to synchronize (step 153) with mobile destination base station 1b by L/L2 signaling, when having guaranteed when synchronous, switching is completed to report and send to mobile destination base station 11b (step 154), after, mobile radio station, in the situation that receiving grouping from mobile destination base station 1b, is carried out to reset and is processed (step 155～160).
, the control part of mobile radio station, when receive lower layer grouping from mobile destination base station 1b, builds RLC SDU, and this RLC SDU is delivered to rearrangement portion (step 155).Whether rearrangement portion checks sequence number has omission (step 156), not omitting, serial number is continuous in the situation that, is delivered to upper layer (step 160) using this RLC SDU as PDCP SDU.On the other hand, in the situation that serial number has omission, control part keeps PDCP PDU to the instruction of rearrangement portion.Thus, rearrangement portion keeps PDCP PDU (step 157), checks and whether receives the continuous RLC SDU (step 158) of serial number.In the case of receiving the continuous RLC SDU of serial number, be delivered to upper layer using this RLC SDU as PDCP SDU, and kept PDCP PDU is delivered to upper layer (step 160).
And, in step 158, do not receive the continuous RLC SDU of serial number, monitor and whether passed through the predefined time (step 159), the in the situation that of process not, the processing that repeating step 157 is later, the in the situation that of process, even if serial number is discontinuous, also kept PDCP PDU is delivered to upper layer (step 160).
In addition, in LTE communication system, carry out while following the forwarding of packets of switching, have following problem.That is, in the time having carried out switching, in LTE communication system, as mentioned above, the data that are retained in the mobile radio station in the 1a of moving source base station are carried out to handing-over, follow handing-over that forwarding of packets occurs.But whether executing data joins in the time switching, this depends on for example whether this forwarding capability is arranged in moving source base station.
Therefore, for example sometimes, moving source base station 1a does not carry out forwarding of packets, and not notified this thing of mobile radio station 4 and erroneous judgement are for having carried out forwarding of packets, in this case, after switching, the rearrangement management department of mobile radio station can vainly wait for that the continuous grouping of serial number arrives until through the stipulated time.Therefore, there is the deteriorated of the increase of communication delay and disposal ability, can not before and after switching, keep high-quality communication quality.
For example, Figure 29 illustrates example.In the time switching, the grouping being retained in the 1a of moving source base station is n-2～n.But in the situation that these not being forwarded a packet to mobile destination base station 1b, mobile radio station 4, from mobile destination base station 1b receives grouping n+1, can vainly wait for that the grouping n-2～n not sending arrives the stipulated time.As a result, there is communication delay, produce the problem that the disposal ability of entire system is declined.
As the 1st prior art, divide into groups the re-assemblying and rearrangement device (patent documentation 1) of reversion reduction of arrival order of the grouping making before having packet recovery from decomposing to decompose.But, the prior art relates to such re-assemblying and rearrangement device, that is: from GPRS (General Packet Radio Service, general packet radio service) GTP (GPRS Tunneling Protocol, GPRS tunnelling agreement) tunnel in grouping before decomposing of packet recovery after decomposing making due to the reversion reduction of decomposing and re-assembly the grouping arrival order producing.
And as the 2nd prior art, the HRPD (high rate packet data) without data degradation while switching between the base station in high speed packet communication in order to realize forwards, and has mobile communication system (with reference to patent documentation 2).In this mobile communication system, between base station and mobile radio station, in high speed packet communication, between the base station of being undertaken by mobile radio station, switch while generation, from the base station of handover source to the base station forwarding packet data that switches destination.
But the 1st and the 2nd prior art can not reduce the deteriorated of the increase of the communication delay causing due to the rearrangement of the grouping receiving from mobile destination base station and disposal ability.
Patent documentation 1: TOHKEMY 2004-135076 communique
Patent documentation 2: TOHKEMY 2004-282652 communique
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, V0.4.0, January2007
Summary of the invention
According to more than, the object of the invention is, while execution in switching controls, be not forwarded to mobile destination base station and (do not carry out handing-over) being retained in grouping in moving source base station, even if serial number is discontinuous, mobile radio station is not also reset.
Another object of the present invention is, while execution, is forwarded to mobile destination base station and (carries out handing-over) being retained in grouping in moving source base station in switching controls, and mobile radio station is reset.
Communication system
The 1st mode of the present invention is a kind of communication system, in this communication system, be provided with base station to send the grouping of the sequence number that is attached with order of representation to mobile radio station (14), described mobile radio station is configured to carry out in order the handing-over of described grouping, in described communication system, carries out and switches
Described communication system comprises the have control part handover source base station (11a) of (24), and this handover source base station (11a) sends indication information to described mobile radio station, and described indication information arranges according to the existence of forwarding of packets,
Wherein, described mobile radio station possesses:
Acceptance division (31), it receives the described indication information arranging according to having or not of described forwarding of packets from described handover source base station; And
Control part (34), it is according to the described indication information arranging according to the existence of described forwarding of packets, controls in order the handing-over of the described grouping that the handover-target base station (11b) from described switching receives.
Brief description of the drawings
Fig. 1 is the key diagram of the 1st embodiment.
Fig. 2 is the form example of the HO response message that comprises communicate status information.
Fig. 3 is the structure chart of base station.
Fig. 4 is the structure chart of mobile radio station.
Fig. 5 is the action flow chart of the mobile destination base station in the 1st embodiment.
Fig. 6 is the form example of HO Indication message.
Fig. 7 is the flow chart of the moving source base station in the 1st embodiment.
Fig. 8 is the action flow chart of the mobile radio station of the 1st embodiment.
Fig. 9 is the rearrangement handling process of mobile radio station.
Figure 10 is the key diagram of the 2nd embodiment.
Figure 11 is the action flow chart of the moving source base station of the 2nd embodiment.
Figure 12 is the action flow chart of the moving source base station of variation.
Figure 13 is the rearrangement handling process in the mobile radio station of variation.
Figure 14 adopts cache management portion not have the structure chart of the base station of the simple type structure of packet forwarding.
Figure 15 is the action flow chart of the moving source base station of the 3rd embodiment.
Figure 16 is the system construction drawing with layer.
Figure 17 is the key diagram of the 4th embodiment.
Figure 18 is the handover process key diagram of the 4th embodiment.
Handing-over key diagram when Figure 19 is switching.
Figure 20 is the switching key diagram of LTE communication system.
Figure 21 is the handover process key diagram of current supposition in LTE communication system.
Figure 22 is the key diagram of order of packets coupling.
Figure 23 is the rearrangement processing spec figure of mobile radio station.
Figure 24 is the key diagram that the protocol architecture between mobile radio station and network is shown.
Figure 25 is the key diagram that PDCP layer is installed in the aGW as upper station and the situation of rlc layer and lower layer is installed in base station.
The action flow chart of moving source base station apparatus when Figure 26 is switching.
The flow chart of mobile destination base station when Figure 27 is switching.
The flow chart of mobile radio station when Figure 28 is switching.
Figure 29 is problem key diagram.
Embodiment
(A) principle of the present invention
In the present invention, below 2 processes can be carried out by base station and mobile radio station, thereby solve problem.
Process 1: in the time switching, moving source base station or mobile destination base station are notified to mobile radio station whether having carried out the handing-over execution information that data join.
Process 2: mobile radio station, in the time receiving described handing-over execution information, judges whether to have carried out data handing-over, in the case of not carrying out the forwarding of packets of companion data handing-over, does not arrive the rearrangement of grouping, is delivered to immediately upper layer from the grouping receiving.
In the conventional method, in base station, the handing-over execution information during not switching is notified to mobile radio station.Therefore,, in the case of the forwarding of packets of not carrying out companion data handing-over, in mobile radio station, vainly wait for that the grouping not forwarding arrives until through the stipulated time, thereby there is the increase of communication delay of generation and the deteriorated problem of disposal ability.But, in the time having used the means of the notice handing-over execution information in the inventive method, because mobile radio station can be known handing-over execution information, thereby in the situation that joining, stop resetting, reset thereby can not carry out futile grouping.Therefore, compared with the conventional method, the communication quality before and after switching can be remained to high-quality.
(B) the 1st embodiment
Fig. 1 is the key diagram of the 1st embodiment, moving source base station 11a in the time that transfer sequence is carried out according to the communication conditions of mobile destination base station 11b judge forwarding of packets could, and forwarding execution information (handing-over execution information) notice to mobile radio station 14.
In Fig. 1, in the time that transfer sequence starts, the grouping n-2～n that mails to mobile radio station is not sent out and is stored in the buffer memory of moving source base station 11a.Grouping n-2 is in transmission, does not reach maximum number of retransmissions or stipulated time.And grouping n-1～n is accumulated in buffer unit BF.In the time that transfer sequence is carried out, mobile destination base station 11b notifies the communicate status information of mobile destination base station to mobile destination base station 11a together with HO response message.Moving source base station 11a in the time receiving this communicate status information, according to the execution of the communications status determination data handing-over of mobile destination base station could, when carry out HO instruction to mobile radio station 14, information is carried out in the handing-over having or not that the handing-over of additional representation data is carried out.
Fig. 2 illustrates the form example of the HO response message that comprises communicate status information.As shown in Fig. 2 (a), this message at least includes identifier ID and communicate status information CST.As identifier, can at least include the new identifier that mobile radio station uses in mobile destination base station.And the destination-address of this message is the i.e. address of mobile destination base station 11b of transmission source address that the address of moving source base station 11a includes this message sometimes.In the situation that this communicate status information is showed by X bit table, definable status number is 2
x.
As shown in Fig. 2 (b), communicate status information CST records Congestion Level SPCC information according to the Congestion Level SPCC of mobile destination base station 11b.For example, by 2 bit tables existing in the situation that, can show 4 kinds of Congestion Level SPCCs (heavy congestion, severe congested, slightly congested, not congested) in Congestion Level SPCC information.On the other hand, as shown in Fig. 2 (c), can record the buffer status information of the memory surplus for notifying mobile destination base station.For example, existing in the situation that, can show 1024 states by 10 bit tables in buffer status information.In the time that this numerical value is showed by Kbyte (kilobytes), the memory of maximum 1024Kbyte represents can guarantee for this mobile radio station.And, as shown in Fig. 2 (d), can record the packet forwarding mount message in mobile destination base station.This forwarding capability mount message refers to the information of at first whether packet forwarding being installed.For example, multiple mobile radio stations are carried out switching in the situation that simultaneously, mail to being grouped in when carrying out forwarding scheduling by scheduler of each mobile radio station and be forwarded.And, in order to forward grouping from moving source base station 11a to mobile destination base station 11b, need forwarding of packets agreement.Have or not for such function mounting, existing in the situation that, can notify having or not of this mount message by 1 bit table.
After moving source base station 11a receives such jam state information message, what judge data handing-over could.For example, in the situation that having notified " slightly congested " from mobile destination base station 11b, executing data handing-over.And, in the situation that having notified " severe is congested " from mobile destination base station 11b, not executing data handing-over.On the other hand, even be to forward the memory surplus that whole groupings also can fully accommodate in the memory surplus of mobile destination base station 11b, executing data handing-over.On the other hand, in the case of the memory surplus of mobile destination base station 11b notified be " 0Kbyte ", not executing data handing-over.And, the in the situation that of mobile destination base station 11b notified " installation " packet forwarding, executing data handing-over.And, the in the situation that of notified " not installing " packet forwarding, not executing data handing-over.
Fig. 3 is the structure chart of base station, shows buffer unit 21, scheduler portion 22, receiving and transmitting part 23 and control part 24.
Buffer unit 21 is the memories that flow into the grouping coming and the grouping forwarding from adjoining base station (moving source base station) from upper station for accumulating.In this figure, physics is provided with 2 buffer memorys, but the apparatus structure that can adopt physics 1 memory to be set and to be cut apart to utilize by software.In multiple mobile radio stations of scheduler portion 22 from communication, select the mobile radio station that carries out wireless transmission, take out the grouping that is accumulated in the corresponding mobile radio station in buffer unit, it is transmitted back to receiving and transmitting part 23.Receiving and transmitting part 23 is encoded and modulation treatment to the grouping sending from scheduler, on wireless, carries out actual data transmission.And, to from mobile radio station send control signal and various data receive, demodulation.
Control part 24 has the 24a of cache management portion, HO control part 24b and the information of mensuration control part 24c.The 24a of cache management portion manages the various groupings that are accumulated in buffer memory 21.When carried out data whens handing-over in the time switching, forward a packet to mobile destination base station being accumulated in whole in buffer unit 21.On the other hand, even if switch in the situation that executing data does not join yet, be controlled to and delete the whole groupings that are accumulated in buffer unit 21.HO control part 24b carries out in switching controls illustrated in fig. 21, measuring control part 24c is the various mensuration information that send from mobile radio station for collecting, the control part of the wireless quality CQI (Channel Quality Information, channel quality information) of for example mobile radio station etc.
Fig. 4 is the structure chart of mobile radio station, shows receiving and transmitting part 31, buffer unit 32, scheduler portion 32, rearrangement portion 33 and control part 34.Receiving and transmitting part 31 carries out grouping between the receiving and transmitting part of base station and the transmitting-receiving of control information.Buffer unit 32 be in the case of can not build RLC PDU according to the lower layer grouping receiving, and keeps until can build this RLC PDU, in the situation that building RLC PDU, removing head, is delivered to rearrangement portion 33 as RLC SDU.Rearrangement portion 33 have for PDCP PDU in order number order rearrange and be delivered to the function of upper floor.Rearrangement portion 33, in the case of the serial number omission that detects PDCP PDU, before receiving the continuous PDCP PDU of serial number, remains on later PDCP PCU in built-in memory.But, in the situation that this PDCP PDU did not also arrive through the stipulated time, rearrangement portion stops resetting processing, and accumulated whole PDCP PDU are delivered to upper layer.
Control part 34 has the control part of mensuration 34a, resets the 34b of management department and the 34c of repeating management portion.Measure control part 34a and measure the various mensuration information that send to base station.For example, measure the wireless quality CQI (Channel Quality Information, channel quality information) of mobile radio station.Reset the 34b of management department and control rearrangement portion 33, and in the case of the PDCP PDU number of having keeping for rearrangement portion 33 is omitted, the arrival of the continuous PDCP PDU of sequence number is waited in instruction.And, in the time of the process stipulated time arrival stand-by period of this grouping, stopping resetting to 33 instructions of rearrangement portion, and remove the head of the whole PDCP PDU that keep, instruction is delivered to upper layer as PDCP SDU, in receiving the state of new PDCP PDU.The 34c of repeating management portion, in the time retransmitting control, utilizes the path shown in dotted line that re-send request may signal is sent to base station via receiving and transmitting part 31.
The in the situation that of implementing to forward, end to transmit grouping n-2 in Fig. 1, grouping n-2～n is forwarded to mobile destination base station 11b.On the other hand, in the situation that not carrying out forwarding of packets, end to transmit grouping n-2, from buffer unit, delete grouping n-2～n.Moving source base station 11a adds the handing-over execution information having or not that represents data handing-over execution to the HO Indication message that mails to mobile radio station 14 and sends.
Fig. 5 is the action flow chart of the mobile destination base station 11b for carrying out relevant a series of actions.
In Fig. 5, the switch control portion 24b of mobile destination base station 11b is in the time receiving HO request (comprising mobile radio station ID and QoS information etc.) (step 201) from moving source base station 11a, carry out calls barred control according to these information, judge whether to permit the acceptance (step 202) of mobile radio station.In objectionable situation, carry out reprocessing (step 211), finish switching controls.
On the other hand, in the case of the acceptance of switch control portion 24b license mobile radio station, the communications status (congestion state or buffer memory use state or function mounting state) (step 203) that judges mobile destination base station 11b, is transmitted back to moving source base station 1a (step 204) the HO request response illustrated in fig. 2 that comprises communicate status information.Next, mobile destination base station 1b is accumulated in (step 124) in buffer memory forwarding from moving source base station 1a the grouping coming, after, buffer unit 21 is stored from moving source base station 11a and is forwarded the grouping of coming.
Under this state, switch control portion 24b completes when report (step 206) when receive HO from mobile radio station 4, HO is completed to report and send to upper station 12 (step 207).Upper station 2 has switched when report when receiving, and packet transfer route is switched to mobile destination base station 11b from moving source base station 11a, and HO is completed to response is transmitted back to mobile destination base station 11b (step 208).The switch control portion 24b of mobile destination base station 11b, in the situation that receiving HO from upper station 12 and completing response, starts to send grouping to scheduler 22 instructions.Thus, scheduler 22 starts to send to mobile radio station 14 from forwarded packet priority, is sending after this grouping, starts the grouping receiving from upper station 12 to send to mobile radio station (scheduling: step 209).And parallel with step 209, switch control portion 24b discharges resource to send to moving source base station 11a (step 210), carries out reprocessing (step 211), finishes switching controls.
Moving source base station 11a utilizes HO Indication message to notify whether carried out forwarding to mobile radio station 14 as mentioned above.Fig. 6 is the form example of HO Indication message, and this message at least includes identifier ID and handing-over execution information PHO.As identifier, at least include the new identifier that mobile radio station uses in mobile destination base station.And the destination-address of this message is that the transmission source address that the address of mobile radio station 14 can include this message is the address of moving source base station 11a.And, in order to notify handing-over execution information, at least record the information of 1.For example, be 0 in the value of this information, represent to have carried out data handing-over (forwarding), on the other hand, be 1 in the value of this information, represent not executing data handing-over.Otherwise, be 0 in the value of this information, represent not executing data handing-over, on the other hand, be 1 in the value of this information, can also represent to have carried out data handing-over.
Fig. 7 is the device action flow chart of the moving source base station for carrying out relevant a series of actions.
In Fig. 7, the user's of moving source base station 11a mensuration control part 24a is in the situation that receiving receiving status information from mobile radio station 14 by measurement report (step 251), judge whether to switch HO (step 252) according to this receiving status information, in the situation that not needing to switch, get back to beginning.
But, determining that switch control portion 24b determines mobile destination base station 11b according to the content of measurement report for need to switch HO in the situation that, and handover request is sent to this moving destination base station 11b (step 253).
Afterwards, receive the HO response message (step 254) sending from mobile destination base station 11b, determine whether carry out grouping handing-over (forwarding) (step 255) according to the communicate status information CST comprising in this HO response message.In the situation that decision joins for not carrying out grouping, HO control part 24b is logged into handing-over execution information PHO (=" 1 ": do not carry out handing-over) in HO Indication message and sends to mobile radio station (step 256), deletes to the 24a of cache management portion instruction the grouping (step 257) being retained in buffer memory 21.
On the other hand, the in the situation that of determining as execution grouping handing-over in step S55, HO control part 24b is logged into handing-over execution information PHO (=" 0 ": carry out handing-over) in HO Indication message and sends to mobile radio station 14 (step 258), to the 24a of cache management portion instruction, the grouping being retained in buffer memory 21 is forwarded to mobile destination base station 11b (forwarding of packets) (step 259).Thus, the 24a of cache management portion utilizes the path of dotted line that the grouping that does not send to mobile radio station 14 being present in buffer memory 21 is forwarded to mobile destination base station 11b.After, receive the resource release message (step 260) of sending from mobile destination base station 11b, carry out resource and discharge (step 261).
Mobile radio station 14 receives the handing-over comprising in HO Indication message and carries out information PHO in Fig. 1, starts to reset in the situation that having carried out handing-over.Specifically, mobile radio station 14, in the case of receiving the grouping after grouping n+1 early than grouping n-2～n, grouping n+1 is not delivered to upper layer, and the arrival of waiting for grouping n-2～n is until through the stipulated time.On the other hand, in the situation that not carrying out handing-over, mobile radio station 14 is not waited for the arrival of the n-2～n that divides into groups, and the later grouping of grouping n+1 is delivered to upper layer immediately and carries out grouping reception preparation subsequently.
Fig. 8 is the action flow chart of mobile radio station.
The determination part 34a of mobile radio station 14 notifies accepting state etc. to moving source base station 11a (step 271) by measurement report.After, control part 34 is waited for the HO Indication message sending from moving source base station 11a, in the situation that receiving HO Indication message (step 272), guarantee to synchronize (step 273) with mobile destination base station 11b by L1/L2 signaling, when having guaranteed when synchronous, switching is completed to report and send to mobile destination base station 11b (step 274).Afterwards, control part 34 is carried out information PHO with reference to the handing-over of the HO Indication message receiving in step 272 and is checked whether carried out data handing-over (forwarding) (step 275), in the situation that not carrying out data handing-over, do not carry out to reset and process, and use the grouping receiving from mobile destination base station 11b to generate PDCP SDU and it is delivered to upper layer (step 276).On the other hand, in step 275, distinguish for having carried out data handing-over in the situation thats, reset the 34b of management department and control rearrangement portion 33 and carry out to reset and process (step 277).
Fig. 9 is the rearrangement handling process of mobile radio station.
In the time that receiving and transmitting part 31 receives lower layer grouping from mobile destination base station 11b, reset the 34b of management department and check whether can build RLC PDU (step 302), in the situation that can not building, check and whether passed through setting-up time (step 303), in the situation that not passing through setting-up time, this lower layer grouping is kept in buffer memory 32 (step 304), carries out the later processing of step 302.Even the in the situation that of also failing to build RLC PDU through setting-up time, delete lower layer grouping (step 305) in buffer memory after receiving lower layer grouping.
On the other hand, in step 302, can divide into groups to build RLC PDU with the lower layer receiving, this RLC PDU is delivered to rearrangement portion 33 (step 306) as RLC SDU.Rearrangement portion 33 is in the situation that receiving RLC SDU, and whether checks sequence number has omission (step 307), without omitting, serial number is continuous in the situation that, is delivered to upper layer (step 311) using this RLC SDU as PDCP SDU.But, in the situation that serial number has omission, reset the 34b of management department and keep PDCP PDU (step 308) to 33 instructions of rearrangement portion.Thus, rearrangement portion 33 keeps PDCP PDU, and checks whether receive the continuous RLC SDU (step 309) of serial number.In the case of receiving the continuous RLC SDU of serial number, be delivered to upper layer using this RLC SDU as PDCP SDU, and kept PDCP PDU is delivered to upper layer (step 311).
And, in step 309, do not receive the continuous RLC SDU of serial number, monitor and whether passed through the predefined time (step 310), the in the situation that of process not, the processing that repeating step 308 is later, in the situation that having passed through setting-up time, even if serial number is discontinuous, also kept PDCP PDU is delivered to upper layer (step 311).
As mentioned above according to the 1st embodiment, while execution in switching controls, be not forwarded to mobile destination base station and (do not carry out handing-over) being retained in grouping in moving source base station, even if serial number is discontinuous, mobile radio station is also without resetting, thereby can save the futile stand-by period, the data delay time can be saved, the disposal ability of entire system can be improved.
(C) the 2nd embodiment
Figure 10 is the key diagram of the 2nd embodiment, moving source base station 11a in the time that transfer sequence is carried out according to communication service kind judge forwarding of packets could, and forwarding execution information (handing-over execution information) notice to mobile radio station 14.
Suppose that moving source base station 11a is to FTP (File Transfer Protocol, file transfer protocol (FTP)) to communicate by letter with Web as the grouping of the non-real-time service (NRT business) of representative and the grouping taking VoIP and stream (streaming) as the real time business (RT business) of representative, the serial number of enclosing as shown in figure 10 is separately housed in buffer memory BF11, BF12 separately and dispatches.And, suppose that the grouping n-2～n that forms the grouping m-2～m of NRT business and form RT business is in transmission or is stored in buffer memory and is not sent to the grouping of mobile radio station 14.Now, suppose that the grouping of carrying out handing-over, RT communication service according to the grouping of NRT communication service do not carry out such strategy of handing-over and carry out maintenance data handing-over.This is because the grouping of the communication service that real-time is high as divided into groups in voip call does not join and discards sending and receiving sound without delay.Because the grouping of the service that real-time is low and QoS is high joins, and can receive high-quality data on the other hand.
Suppose that the mobile radio station 14 switching carries out RT communication, according to above-mentioned forwarding of packets strategy, the HO control part 24b of moving source base station 11a, in the time that transfer sequence is carried out, determines as the grouping n-2 in current transmission and the grouping n-1～n in accumulating not being forwarded to mobile destination base station 11b.Then, the handing-over information PPO forwarding is documented in HO Indication message and is notified to mobile radio station 14.Message format is now identical with Fig. 6.Receiving in the mobile radio station 14 of handing-over information PHO, as shown at the 1st embodiment, carry out the action identical with Fig. 8 and Fig. 9, do not reset processing.
On the other hand, suppose that the mobile radio station 14 switching carries out NRT communication, according to above-mentioned forwarding of packets strategy, the HO control part 24b of moving source base station 11a, in the time that transfer sequence is carried out, determines to be forwarded to mobile destination base station 11b for the grouping m-1～m the grouping m-2 in current transmission and in accumulating.Then, the handing-over information PHO that has carried out forwarding is documented in HO Indication message and is notified to mobile radio station 14.Message format is now identical with Fig. 6.Receiving in the mobile radio station 14 of handing-over information PHO, as shown at the 1st embodiment, carry out the action identical with Fig. 8 and Fig. 9, reset processing.
Figure 11 is the action flow chart of the moving source base station for carrying out above a series of actions, and the step identical with the flow process of Fig. 7 of the 1st embodiment enclosed to same numeral.Difference is, in step 255 ' in, be that NRT communication service or RT communication service determine whether carrying out grouping handing-over (forwarding) according to communication service.In the situation that communication service is RT communication service, HO control part 24b determines as not joining, and handing-over execution information PHO (=" 1 ": do not carry out handing-over) is logged in HO Indication message and sends to mobile radio station (step 256), delete to the 24b of cache management portion instruction the grouping (step 257) being retained in buffer memory 21.
On the other hand, in step 255 ' in determine as carrying out grouping handing-over in the situation that, HO control part 24b is logged into handing-over execution information PHO (=" 0 ": carry out handing-over) in HO Indication message and sends to mobile radio station 14 (step 258), to the 24a of cache management portion instruction, the grouping being retained in buffer memory 21 is forwarded to mobile destination base station 11b (forwarding of packets) (step 259).
Variation
In the 2nd embodiment, in the situation that communication service is RT communication service, do not carry out handing-over, even but RT communication service, sometimes according to (for example voip call) set join or do not join.Variation is the example corresponding with this situation, and Figure 12 is the action flow chart of the moving source base station 11a of variation, and the step identical with the flow process of Figure 11 of the 1st embodiment enclosed to same numeral.Difference is to have step 265, that is: in the situation that communication service is RT communication service, check whether be that handing-over is set, in the situation that not being handing-over setting, determine as not forwarding, handing-over execution information PHO (=" 1 ": do not carry out handing-over) is logged in HO Indication message and sends to mobile radio station (step 256), delete to the 24b of cache management portion instruction the grouping (step 257) being retained in buffer memory 21.
On the other hand, the in the situation that of being handing-over setting in step 265, HO control part 24b is logged into handing-over execution information PHO (=" 0 ": carry out handing-over) in HO Indication message and sends to mobile radio station 14 (step 258), to the 24a of cache management portion instruction, the grouping being retained in buffer memory 21 is forwarded to mobile destination base station 11b (forwarding of packets) (step 259).
Figure 13 is the rearrangement handling process in the mobile radio station of variation, and the part identical with the handling process of Fig. 9 of the 1st embodiment enclosed to same numeral.Whether difference is, according to being that voip call is switched and continued to reset the time of processing.; in step 309, do not receive the continuous RLC SDU of serial number; whether the investigation KOC kind of call is voip call (step 312); in the situation that being not voip call; monitor and whether passed through predefined the 1st setting-up time TS1 (step 310); the in the situation that of process not; the processing that repeating step 308 is later; in the situation that having passed through setting-up time; even if serial number is discontinuous, also kept PDCP PDU is delivered to upper layer (step 311).And, the in the situation that in step 312, the KOC kind of call being voip call, monitor and whether passed through the 2nd setting-up time TS2 (< TS1) (step 313), the in the situation that of process not, the processing that repeating step 308 is later, in the situation that having passed through setting-up time, even if serial number is discontinuous, also kept PDCP PDU is delivered to upper layer (step 311).
According to variation, the in the situation that of voip call, divide into groups by handing-over as mentioned above, can improve the quality of VoIP, and by reducing setting-up time TS2, can reduce to process the time of delay causing by resetting.
(D) the 3rd embodiment
The 3rd embodiment is such embodiment, that is: according to having or not of the packet forwarding of moving source base station decide forwarding of packets could, and this execution information is notified to mobile radio station.Figure 14 adopts cache management portion not have the structure chart of the base station of the simple type structure of packet forwarding, and the part identical with the base station of Fig. 3 of the 1st embodiment enclosed to same numeral.Difference is that the 24a ' of cache management portion has easy structure, and the function and the forwarding of packets scheduler function that forward a packet to mobile destination base station 11b are not installed.
Figure 15 is the action flow chart of moving source base station, and the step identical with the flow process of Fig. 7 of the 1st embodiment enclosed to same numeral.Difference is, in step 255 " in, determine whether carrying out grouping handing-over (forwarding) according to whether forwarding capability and forwarding of packets scheduler function are installed in the 11a of moving source base station.In the situation that above-mentioned functions is not installed, HO control part 24b determines as not forwarding, handing-over execution information PHO (=" 1 ": do not carry out handing-over) is logged in HO Indication message and sends to mobile radio station (step 256), delete to the 24b of cache management portion instruction the grouping (step 257) being retained in buffer memory 21.
On the other hand, in step 255 " in forwarding capability and forwarding of packets scheduler function are installed in the situation that; determine as carrying out grouping handing-over; HO control part 24b is logged into handing-over execution information PHO (=" 0 ": carry out handing-over) in HO Indication message and sends to mobile radio station 14 (step 258), to the 24a of cache management portion instruction, the grouping being retained in buffer memory 21 is forwarded to mobile destination base station 11b (forwarding of packets) (step 259).
(E) the 4th embodiment
In above embodiment, as shown in Figure 16 (A), this embodiment has installed PDCP layer and the interior example that rlc layer and lower layer have been installed in base station 11 in the aGW12 as upper station, but as shown in Figure 16 (B), system can also be configured to: interior whole installation PDCP layers, rlc layer and lower layer in base station 11, and make aGW12 only there is the simple functions such as Packet routing selection function.Then,, in the system configuration of Figure 16 (B), also can make base station there is serial number additional function.Figure 17 is the forwarding key diagram switch in this system in the situation that.
Send 3 groupings from upper station 12 to moving source base station 11a, in this base station, added packet number n-2, n-1, n.Suppose at these groupings n-2, n-1, n and do not send to mobile radio station and be kept under the state in buffer memory and start to switch.Then, suppose and in the time that transfer sequence is carried out, forward these groupings n-2, n-1, n, be forwarded to mobile destination base station 11b from moving source base station 11a as shown in the figure.In this forwarding, sometimes send grouping from upper station 12 to mobile destination base station 11b.In this case, mobile destination base station 11b can not add correct serial number to the grouping receiving from upper station 12.Therefore, moving source base station 11a, in the time that the described grouping n-2, n-1, the n that do not send to mobile radio station are handed off to mobile destination base station 11b, are also handed off to this serial number and move destination base station., join to adding to the serial number n+1 of the grouping that sends to mobile destination base station 11b from upper station 12.Like this, in above-mentioned forwarding, even send grouping from upper station 12 to mobile destination base station 11b, the control part 24 of mobile destination base station 11b also can add serial number n+1 to this grouping.
In addition, the in the situation that of the 4th embodiment, be included in HO Indication message and send to mobile radio station by the handing-over information PHO that makes expression carry out or not carry out forwarding, can in the situation that not forwarding, omit to reset and process.
Figure 18 is the handover process key diagram of the 4th embodiment, and the process identical with the handover process key diagram of Figure 21 enclosed to same numeral.Difference is, before carrying out forwarding of packets, to carry out the handing-over of serial number SN from moving source base station 11a to mobile destination base station 11b.
According to the 4th embodiment, even the in the situation that of serial number being added to grouping in base station, also in the time switching, carry out the handing-over of serial number, thereby can in mobile destination base station, correct serial number be added to grouping, and in the situation that not forwarding, can in mobile radio station, omit to reset and process.
Invention effect
Above according to the present invention, while execution in switching controls, be not forwarded to mobile destination base station and (do not carry out handing-over) being retained in grouping in moving source base station, even if serial number is discontinuous, mobile radio station is also without resetting, thereby can save the futile stand-by period, the data delay time can be saved, the disposal ability of entire system can be improved.
And, according to the present invention, even in the case of not carrying out forwarding according to the communications status of mobile destination base station (idle state of congestion state, buffer memory, function mounting state) and communication service kind, mobile radio station is also without resetting, thereby can save the futile stand-by period, the data delay time can be saved, the disposal ability of entire system can be improved.
And, according to the present invention, the in the situation that of voip call, by the handing-over of dividing into groups, can improve the quality of VoIP in the time switching, and reset the continuation time of processing by shortening, can reduce the time of delay being caused by the rearrangement processing in mobile radio station.
And, according to the present invention, even the in the situation that of serial number being added to grouping in base station, also in the time switching, carry out the handing-over of serial number, thereby can in mobile destination base station, correct serial number be added to grouping, and in the situation that not forwarding, can in mobile radio station, omit to reset and process.
Claims (3)
1. a communication system, in this communication system, be provided with base station to send the grouping of the sequence number that is attached with order of representation to mobile radio station (14), described mobile radio station is configured to carry out in order the handing-over of described grouping, in described communication system, carries out and switches
Described communication system comprises the have control part handover source base station (11a) of (24), and this handover source base station (11a) sends indication information to described mobile radio station, and described indication information arranged according to having or not of forwarding of packets,
Wherein, described mobile radio station possesses:
Acceptance division (31), it receives the described indication information arranging according to the existence of described forwarding of packets from described handover source base station; And
Control part (34), it,, according to the described indication information arranging according to the existence of described forwarding of packets, is controlled at the handing-over of the grouping receiving from handover-target base station (11b) in described switching in order.
2. communication system according to claim 1, wherein, the described control part (24) of described handover source base station (11a) determines that the forwarding of packets that does not also send to described mobile radio station (14) that whether described handover source base station will receive from upper station (12) is to described handover-target base station (11b), be controlled at the forwarding of the described grouping from described handover source base station to described handover-target base station in described switching according to described decision, and control the transmission of the described indication information from described handover source base station to described mobile radio station.
3. communication system according to claim 1, wherein, the control part (24) of described handover source base station (11a) determines that in described switching the forwarding of packets that does not also send to described mobile radio station (14) that whether described handover source base station will receive from upper station (12) is to described handover-target base station (11b).
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| CN201410327038.XA CN104080131B (en) | 2007-03-22 | 2007-03-22 | Communication system |
| CN200780052045.1A CN101622830B (en) | 2007-03-22 | 2007-03-22 | Base station, mobile station, communication system and reordering method thereof |
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| CN200780052045.1A Division CN101622830B (en) | 2007-03-22 | 2007-03-22 | Base station, mobile station, communication system and reordering method thereof |
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| US6359871B1 (en) * | 1994-05-27 | 2002-03-19 | Curtin University Of Technology | Cellular communications network |
| CN1505876A (en) * | 2001-04-30 | 2004-06-16 | 诺基亚有限公司 | Method of transmitting signaling messages in a mobile telecommunications network |
| CN1541470A (en) * | 2001-08-10 | 2004-10-27 | Ħ��������˾ | Method of determining volumn of resequenced buffer and method of transmitting data via RF link |
| CN1669350A (en) * | 2002-09-24 | 2005-09-14 | 富士通株式会社 | Data packet transferring/transmitting method and mobile communication system |
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- 2007-03-22 CN CN201410327038.XA patent/CN104080131B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6359871B1 (en) * | 1994-05-27 | 2002-03-19 | Curtin University Of Technology | Cellular communications network |
| CN1505876A (en) * | 2001-04-30 | 2004-06-16 | 诺基亚有限公司 | Method of transmitting signaling messages in a mobile telecommunications network |
| CN1541470A (en) * | 2001-08-10 | 2004-10-27 | Ħ��������˾ | Method of determining volumn of resequenced buffer and method of transmitting data via RF link |
| CN1669350A (en) * | 2002-09-24 | 2005-09-14 | 富士通株式会社 | Data packet transferring/transmitting method and mobile communication system |
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