CN101562849A

CN101562849A - Method for processing data stream in downlink business direct-cut operation

Info

Publication number: CN101562849A
Application number: CNA2008100917439A
Authority: CN
Inventors: 孙奇
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2008-04-14
Filing date: 2008-04-14
Publication date: 2009-10-21
Anticipated expiration: 2028-04-14
Also published as: CN101562849B

Abstract

The invention relates to a method for processing a data stream in down-link business direct-cut operation, including the steps: a serving base station determines that a terminal needs to be switched to a target base station, sends first information to the target base station, and breaks the linking with the terminal; the target base station generates and broadcasts second information according to the received first information; and the terminal determines the downlink data thereof according to the received second information and receives the subsequent down-link data. The method shortens the time of data interruption in a switching process, and reduces the problems of transmission delay, packet loss, and the like caused by data buffering.

Description

Data flow processing method in the downlink business direct-cut operation

Technical field

The present invention relates to mobile WiMAX system, particularly, relate in the direct-cut operation of a kind of real-time downlink business (VOD program request, VoIP etc.) processing method customer traffic.

Background technology

At present, in the direct-cut operation of mobile WiMAX system, when finishing switch decision, and discharge after the old link, terminal will be finished from down-going synchronous to a series of processes such as new sub-district accesses.Detailed process can comprise: with new DL synchronously and obtain parameter (synchronizewith new DL and obtain parameters), obtain UL parameter (obtain ULparameters), range finding and UL parameter adjustment (Ranging and UL parameteradjustment), MS re-authentication, register and rebulid service flow (MS reauthorization, Reregister and reestablish service flows).This process specifically as shown in Figure 4.

Before finishing above a series of process, because terminal is not upgraded CID (ConnectionIdentification, connection identifier), target BS can't be this MS allocation of downlink resource.This cause can only cache user data, wait for that new link establishment finishes, just can be forwarded to new serving BS, and user can't receive data during this.It is the interruption that the process of link re-establishment causes the terminal downlink data receiving.

For user data, traditional processing method is: network-caching user's downlink data, finish up to new link establishment; After terminal is finished the renewal of CID at new serving BS, transmit user data, be handed down to the user by new link connection again to new serving BS.But because real time business, when issuing data cached meeting overlapping with real time data, cause the user to receive the serious phenomenons that descend of service quality such as data time sequence mistake, packet loss is serious even can't handle and take place.Have at present a large amount of research at quick switching, reduce handover delay, but the problem that exists during to the real time business direct-cut operation not have the solution of getting well.

In sum, when carrying out direct-cut operation, how to reduce the data flow transmission time delay, reducing packet loss is the problem of needing solution badly.

Summary of the invention

At the problem of data interruption in the real-time downlink business direct-cut operation, a kind of minimizing subtrahend is proposed according to the flow transmission time delay, reduce the method for packet loss.

According to the present invention, the data flow processing method in a kind of downlink business switching has been proposed, comprise step:

Serving BS is determined and terminal will be switched to target BS, sends first message to target BS, and linking between disconnection and the terminal;

Target BS produces second message, and broadcasts described second message according to first message that receives;

Terminal determines to belong to the downlink data of himself according to second message that receives, and receives follow-up downlink data.

The present invention utilizes the Extended IE among the downlink broadcast message DL_MAP, is the downlink data resource that the terminal distribution of carrying out direct-cut operation can be used, and terminal receives that the indication of broadcast can receive descending real time business data.Thereby shortened the time of data interruption in the handoff procedure, reduced metadata cache and the propagation delay time that causes, problems such as packet loss.

Description of drawings

Fig. 1 shows the processing procedure according to data stream switching method of the present invention;

Fig. 2 shows Extended IE (extend information unit) form of the present invention's definition, is used for the user's allocation of downlink data resource to hand-off execution process;

Fig. 3 shows signaling and data flow comparison in the present invention and the prior art handoff procedure;

Fig. 4 shows the flow process according to prior art new link establishment in switching;

Fig. 5 shows the OFDMA DL-MAP IE format in the 802.16e agreement;

Fig. 6 shows the DL-MAP extended IE format in the 802.16e agreement;

Fig. 7 shows the Extended DIUC code in the 802.16e agreement.

Embodiment

Fig. 1 shows according to the present invention in handoff procedure the processing procedure to data flow.As shown in Figure 1, at step S11, serving BS (that is, the base station before terminal is switched) is determined the target BS that terminal need switch to, and with CID﹠amp; Information such as MAC Address send to target BS.

At step S12, carry out and switch, discharge the link between Current Serving BTS and the terminal.

At step S13, terminal sends user data by access service network gateway (ASN-GW) to target BS.

At step S14, target BS determines whether the user finishes in operations such as the registration of target BS and CID renewals.If then at step S17, utilize the CID that upgrades, so that send downlink data to user's allocation of downlink resource.Otherwise at step S16, the target BS utilization is according to expansion IE of the present invention, in the mode of broadcasting to user's allocation of downlink resource.Whether to one's name the mode that terminal combines with MAC Address by existing CID judges the downlink data that sent by target BS, if, then receive, otherwise, these data then refused.

Therefore, even terminal is not carried out uplink synchronous, when also not succeeding in registration,, then can receive the broadcast in the descending sub frame as long as finish down-going synchronous.

In the 802.16e_2007_D0 agreement, the format structure of the DL_MAP_IE of WirelessMAN_OFDMA PHY as shown in Figure 5.When having DIUC==15 during if DL_MAP is IE (down link MAP information unit), this IE represents specific information, its DL-MAP extended IE format structure and has also been made regulation to the usage of extended DIUC code as shown in Figure 6 in agreement, see Fig. 7.As seen the DIUC code of 09-0A and 0C-0E keeps, and can redefine.Here, the DL-MAPextended IE format among above-mentioned Fig. 6 is further expanded, the ExtendedIE format of definition as shown in Figure 2 according to the present invention.

Here, when switching terminal utilization broadcasting CID receives the extended IE information according to the present invention from target BS, switch in terminal and to receive that REG-RSP carries out before CID upgrades, terminal need keep the CID among the previous BS to communicate.For avoiding old CID to conflict with existing subscriber's CID in the target BS, the present invention utilizes the last 8+CID of terminal MAC Address to distinguish the user, and the user who has guaranteed thus only to be in when switching could downlink data receiving.

Fig. 3 show according to the present invention and the handoff procedure of prior art in signaling and data flow process relatively.

1) during the T0-T1

On the datum plane: BS#1＜-MS between the normal downlink data that receives BS, the Data Stream Processing with traditional scheme is identical here.

On the signaling plane: MS at first carries out handover measurement, and sends MOB-MSHO-Req to BS#1.Interaction message between target BS BS#2, the BS#3 that BS#1 finds by backbone network and in the handover measurement stage.Here, except traditional bandwidth BW and Qos message, BS#1 also sends the CID among the BS#1 and the MAC Address of terminal MS to candidate target base station BS#2, BS#3, is used for distinguishing at Extended IE the ownership of user data.After the Signalling exchange, finally select BS#3, disconnect old link then as target BS.

2) T1 is during the T2

On the datum plane: because new link do not set up, and down-going synchronous do not finish, and Nei business datum needs buffer memory during this period of time, waits for that the down-going synchronous success transmits again.With respect to traditional scheme,, saved T1 and during T3, obtained UL parameter, range finding and UL parameter adjustment, MS re-authentication and registration process according to a time needs time T 1 to T2 of metadata cache of the present invention.

On the signaling plane: terminal is carried out down-going synchronous, and obtains the corresponding downstream channel parameter.

3) T2 is during the T3

On the datum plane: target BS BS#3 utilizes the CID+MAC address that sends from BS#1, is user's allocation of downlink data resource by Extended IE (its concrete definition format is seen figure two).Terminal receives the DL-IE MAP of broadcasting, finds the existence of Extended IE, and receives the data of being distributed by this IE.

On the signaling plane: terminal is carried out the adjustment of uplink synchronous, range finding and parameter, the mandate in BS#3, heavily registration and the steps such as renewal of CID.

On the contrary, T1 is during the T3, because terminal is not upgraded CID in traditional scheme, target BS can't be this MS allocation of downlink resource, cause user's data can only buffer memory to wait for that new link establishment finishes, just can be forwarded to new serving BS, and user can't receive data during this.

4) after the T3, the handoff procedure of terminal is finished, and BS#3 utilizes the CID that upgrades to send downlink data for the user.

As can be seen, as long as down-going synchronous success, user terminal can be judged one's own downlink data from MAC Address, need not carry out processes such as range finding in the general handoff procedure and uplink parameter adjustment, CID renewal, can receive descending real time business data.Thus, can find range, in the operations such as UL parameter update, MS re-authentication, receive downlink data, thereby shortened the time of data interruption in the handoff procedure, reduced metadata cache and problem such as the propagation delay time that causes, packet loss from target BS.

Although the present invention is described according to described embodiment, it is pointed out that these embodiment are used for explaining, rather than be used for the present invention is limited.Those of ordinary skill in the art can be easy to these embodiment are changed, increase, delete any step and do not break away from the spirit and scope of the present invention.

Claims

1. the data flow processing method during a downlink business switches comprises step:

2. method according to claim 1, wherein, described first message comprises the connection identifier and the medium access control MAC Address of terminal.

3. method according to claim 2, wherein, described second message is the DL MAP information unit of expansion, comprises the MAC Address of terminal.

4. method according to claim 1, wherein, terminal receives described second message after finishing down-going synchronous.

5. method according to claim 1, wherein, terminal is finished with the connection identifiers CID of target BS and is upgraded in downlink data receiving.