CN101207848B - Base station, system and method for switching data business - Google Patents

Base station, system and method for switching data business Download PDF

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Publication number
CN101207848B
CN101207848B CN2007101724053A CN200710172405A CN101207848B CN 101207848 B CN101207848 B CN 101207848B CN 2007101724053 A CN2007101724053 A CN 2007101724053A CN 200710172405 A CN200710172405 A CN 200710172405A CN 101207848 B CN101207848 B CN 101207848B
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sdu
message
sequence number
sdu message
user terminal
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CN101207848A (en
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程竹林
陈钧
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Huawei Technologies Co Ltd
XFusion Digital Technologies Co Ltd
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Shanghai Huawei Technologies Co Ltd
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Abstract

The invention provides a data service switching method, a system and a base station thereof. The method of data service switching includes that the target base station acquires the related order number information of a SDU datagram to be received from a mobile station; the target base station positions the corresponding SDU datagram according to the related order number information of the SDU datagram, and sends data from the SDU datagram to the mobile station. Through the technical proposal provided by the embodiment of the invention, the base station can position the corresponding SDU datagram according to the related feedback order number information of the SDU datagram and send the SDU datagram to user terminals, thus the continuity of the data sent to user terminals can be guaranteed after user terminals switch from a source base station to the target base station.

Description

Method and system, base station that data service is switched
Technical field
The present invention relates to communication technical field, method and system, base station that particularly a kind of data service is switched.
Background technology
Whole world microwave interconnection inserts (Wimax, Worldwide Interoperability for MicrowaveAccess) system can support common direct-cut operation, fast base station conversion (FBSS, Fast Base StationSwitching), grand diversity is switched (MDHO, Macro Diversity Handover) etc.
For common hard handover approach, user terminal switches to target BS from source base station (BS, Base Staion), and the data that user terminal received are sent to switch to by target BS by source BS and send, and in handoff procedure, the situation that may have loss of data takes place.
In the existing technical scheme, when user terminal switches to target BS from source BS, how undefined target BS obtains Service Data Unit (SDU, Service Data Unit) corresponding relation of associated sequence numbers information of same SDU message, therefore target BS can't confirm to send to the SDU message of user terminal, and the data that cause sending to user terminal are discontinuous.
Summary of the invention
The technical problem that the embodiment of the invention will solve provides method that a kind of data service switches and system thereof, base station, can guarantee to send in handoff procedure the continuity of the data of user terminal.
For solving the problems of the technologies described above, the purpose of the embodiment of the invention is achieved through the following technical solutions:
The method that the embodiment of the invention provides a kind of data service to switch comprises:
Target BS obtains the associated sequence numbers information of Service Data Unit (SDU) message of user terminal to send up;
Target BS is according to the associated sequence numbers information of described SDU message, the SDU message that the location is corresponding, and send data to user terminal from described SDU start of heading.
The system that the embodiment of the invention provides a kind of data service to switch comprises:
User terminal is used to provide the associated sequence numbers information of Service Data Unit (SDU) message and receives data;
Target BS is used to receive the associated sequence numbers information of the SDU message that user terminal provides, and according to described associated sequence numbers information, the SDU message that the location is corresponding, and send data to user terminal from described SDU start of heading.
The embodiment of the invention provides a kind of base station, comprising:
First receiving element is used to receive the associated sequence numbers information of the SDU message that user terminal provides;
Positioning unit is used for the associated sequence numbers information of the SDU message that receives according to described receiving element, navigates to corresponding SDU message;
Transmitting element, the SDU start of heading that is used for locating from described positioning unit, send data to user terminal.
Method, base station that the data service that provides by the embodiment of the invention is switched, the base station can be according to the relevant information of the SDU sequence number of feeding back, the SDU message that the location is corresponding also sends to user terminal, thereby after having guaranteed that user terminal switches to target BS from source base station, send to the continuity of the data of user terminal.
Description of drawings
Fig. 1 is the flow chart of method first embodiment of data service switching of the present invention;
Fig. 2 is the flow chart of method second embodiment of data service switching of the present invention;
Fig. 3 is the structure chart of an embodiment of system of data service switching of the present invention.
Embodiment
The method and system that the embodiment of the invention provides a kind of data service to switch.For making technical scheme of the present invention clearer, below with reference to accompanying drawing and enumerate embodiment, the present invention is described in more detail.
Please refer to Fig. 1, the flow chart of first embodiment of the method for switching for data service of the present invention.In the present embodiment, the The data Generic Routing Encapsulation (GRE, Generic RoutingEncapsulation) that BS sends encapsulates, and user terminal adopts non-ARQ to connect when source BS switches to target BS.
In the present embodiment, user terminal is travelling carriage (MS, Mobile Station).
The detailed process of the method that data service is switched comprises:
Step 101: when travelling carriage inserts source BS, when source BS sends datagram to MS, use SDUSN expansion head to inform the current associated sequence numbers information that sends to the SDU message of travelling carriage of MS;
In the present embodiment, the associated sequence numbers information of SDU message is the SDU sequence number of SDU message.Access service network gateway (ASN GW, Access Service Network Gateway) the The data GRE that sends to BS encapsulates, therefore, can adopt the SDUSN of the least-significant byte of GRE bag sequence number as the SDU message, also can take other algorithms to calculate the SDU SN of SDU message, as get low 7 etc. by GRE bag sequence number.The SDU SN of definition SDU message is generally 8 in the prior protocols, and value is 0 to 255.Therefore, in the present embodiment, the relevant information of SDU SN is the least-significant byte of the GRE bag sequence number of SDU message.
Described SDU sequence number can be generated according to the sequence number of GRE bag by BS, also can generate according to additive method to ASN GW by sending message, and at R4, carry serial number information in the message of R6 interface.
Source BS is sending medium access control (MAC, Media Access Control) protocol Data Unit (PDU, Protocol Data Unit) can expand the sequence number that son head (SDU SN extendedsub-header) is informed the SDU of the current transmission of MS by SDU SN the time, though source BS can send the sub-head of such expansion to each SDU, but MS can add up to the sequence number of follow-up SDU, so MS can know the sequence number of each SDU.
Step 102: after MS switched to target BS from source BS, MS went up header (SN reportheader) reports SDU SN from the SDU message to target BS by SN;
Step 103: target BS is according to the SDU SN of the SDU message that reports, the corresponding SDU message in location from the SDU message that target BS receives, and continue to send data to MS from described SDU start of heading.
The corresponding SDU message detailed process in described location comprises:
Steps A: target BS is according to the SDU SN of the SDU message that reports, calculates the GRE sequence number of the SDU message that MS need receive;
At first, after the R6 passage between hypothetical target BS and the GW was set up, the GRE sequence number of the SDU that target BS is received was G1, gets the SDU SN (be assumed to be S1) of the least-significant byte of G1 as this SDU message so;
Secondly, judge the SDU SN (being assumed to be S) of the SDU message that reports; And the size between the SDU SN S1 of the current SDU message of receiving of target BS:
If S>S1, and S-S1<128, then the GRE sequence number computing formula of the MS SDU message that need receive is: G=(G1 is high 24) moves to left 8+S;
If S<S1, and S1-S>128, then the GRE sequence number computing formula of the MS SDU message that need receive is: G=(G1 is high by 24+1) moves to left 8+S;
Other situations then illustrate to have unusual generation in the handoff procedure, cause data to have and lose, and target BS begins to send data to MS from the SDU of GRE sequence number G1.
Step B: target BS navigates to corresponding SDU message according to the GRE sequence number of calculating gained.
Be included in when switching in the SDU message that described target BS receives, source BS does not send to the SDU message of MS.The SDU message of the described MS of not sending to can return to target BS from source BS by GW, and source BS need carry the GRE serial number information of message during message in passback, when GW transmits described message and gives target BS, adopts the sequence number of the message that described source BS carries when the passback message; Also can resend target BS after the switching by the GW buffer memory before data service is switched; Can also be when data service is switched, source BS and target BS be carried out that data are two to be broadcast by GW, send to source BS and target BS simultaneously.
In the present embodiment, the The data GRE that BS sends and receives encapsulates, and therefore adopts the conversion of GRE bag sequence number to obtain the SDU SN of SDU message.The data that BS sends and receives can also adopt other packaged types to encapsulate.Described other packaged types have following characteristics: the corresponding SDU of R6 interface packets, and each encapsulated message all has a bag sequence number, message of every transmission, sequence number adds up 1; Perhaps SDU needs segmentation when the R6 interface transmits, can encapsulate earlier, segmentation again; Also can first segmentation, encapsulation again, but require all segmentations to have identical sequence number in this case, by other message identification segment informations, the SN that guarantees continuous SDU also is continuous, so then can adopt the pairing bag sequence number conversion of other packaged types to obtain the SDU SN of SDU message.
Please refer to Fig. 2, the flow chart of second embodiment of the method for switching for data service of the present invention.In the present embodiment, when MS switches to target BS from source BS, adopt ARQ to connect.
The detailed process of the method that described data service is switched comprises:
When step 201:MS inserts source BS, the SDU SN of source BS record SDU message and the corresponding relation of piece sequence number (BSN, Block Sequence Number);
Use fragmentation feature if ARQ connects, then SDU will carry out segmentation according to the automatic repeat requests data block size (ARQ_Block_Size) of default, and the SDU SN of source BS record SDU message is with the corresponding relation of the BSN of first ARQ data block;
If connecting, ARQ forbids segmentation, only corresponding ARQ data block of SDU then, and the SDU SN of source BS record SDU message is with the corresponding relation of the BSN of described ARQ data block.
Step 202: when MS when source BS switches to target BS, source BS informs the SDU that target BS does not send the earliest or do not replied and the BSN of pairing first piece of SDU message before thereof;
In the present embodiment, source BS informs the corresponding relation of the BSN of the SDU SN of SDU that target BS does not send the earliest or do not replied and one or more SDU before thereof and first piece.
Please, be the SDU SN of the received SDU message of target BS and the mapping table of BSN referring to following table 1.
Table 1 SDU SN and BSN mapping table
?SDU?SN S1 S2
Corresponding BSN B1 B2
In the above-mentioned table 1, S2 is the SDU SN of the SDU message that do not send the earliest or do not replied, and B2 is the BSN of first piece corresponding with described S2; S1 is the SDU SN (the SDU message of described S1 correspondence is sent by source BS) of a SDU message before the SDU message that does not send or do not replied, and B1 is the BSN of first piece corresponding with described S1.
In the present embodiment, SDU SN is 8, and the least-significant byte that can adopt GRE bag sequence number is as SDU SN, and the sequence number that also can adopt other packing forms is as SDN SN, and BSN is 11.
The comparison rule of SDU SN is: suppose 0<S2-S1<128, and perhaps S2-S1<-128, then S2 is greater than S1, otherwise is that S2 is less than S1; The comparison rule of BSN is: suppose 0<B2-B1<1024, and perhaps B2-B1<-1024, then B2 is greater than B1, otherwise is that B2 is less than B1.
Step 203:MS goes up header reports associated sequence numbers information from the SDU message to target BS by SN;
In the present embodiment, the associated sequence numbers information of SDU message is BSN.
MS knows that the mode of the BSN of SDU message is: source BS carries the BSN of described message when sending datagram to MS.
Step 204: the BSN of the SDU message that target BS reports according to MS, and the BSN of first piece of the source BS SDU message of informing, the SDU message that the location is corresponding, and send data to MS from described SDU start of heading;
If connecting, ARQ forbids segmentation, only corresponding ARQ data block of SDU so, and therefore the BSN of the SDU message that can report according to MS directly navigates to corresponding SDU message;
If connecting, ARQ uses fragmentation feature, the BSN (being assumed to be Bx) of the SDU message that target BS reports according to MS, and the BSN of first piece of the source BS SDU message of informing, navigate to corresponding SDU message, its concrete mode is: target BS navigates to corresponding SDU message by judging the size between Bx and B1, the B2.
Suppose that the BSN that MS reports target BS is Bx, and the S2>S1 in the table 1.
If Bx is greater than B1, and less than B2, then MS has received the part of the SDU message of S1 correspondence, so target BS begins to send data to MS from the position of (Bx-B1) * ARQ_Block_Size byte (the 0th byte is start byte) of the SDU message of S1 correspondence;
Have and lose (SDU between the SDU of Bx correspondence and this SDU SDU corresponding with B1 does not send to target BS) if Bx, then illustrates data less than B1, therefore the SDU start of heading from the S1 correspondence, send data to MS;
If Bx, then illustrates source BS greater than B2 and up-to-date SDU SN and the corresponding relation of BSN is not sent to target BS, carries out abnormality processing.
In the present embodiment, source BS does not send to the SDU message of MS when being included in switching in the SDU message that described target BS receives.This message can pass back to target BS by GW by source BS; Can also be when switching, source BS and target BS be carried out that data are two to be broadcast by GW, send to source BS and target BS simultaneously.
Please refer to Fig. 3, the structure chart of an embodiment of system who switches for data service of the present invention.Described data service switched system comprises travelling carriage 31, target BS 32 and source base station 33.Described travelling carriage 31 is used to provide the associated sequence numbers information of SDU message to target BS 32 and reception data; Described target BS 32 is used for the associated sequence numbers information of the SDU message that receiving mobile 31 provides, and according to the associated sequence numbers information of described SDU message, the SDU message that the location is corresponding, and continue to send data to travelling carriage 31 from described SDU start of heading; Described source base station 33 is used for the associated sequence numbers information to described travelling carriage 31 transmission SDU messages.
Described target BS 32 further comprises first receiving element 321, positioning unit 322, transmitting element 323.Described first receiving element 321 is used for the associated sequence numbers information of the SDU message that receiving mobile 31 provides; Described positioning unit 322 is used for the associated sequence numbers information of the SDU message that receives according to described receiving element 321, navigates to corresponding SDU message; Described transmitting element 323, the SDU start of heading that is used for being obtained from described positioning unit 322, send data to travelling carriage 31.
Described positioning unit 322 may further include:
Computing unit is used for the associated sequence numbers information of the SDU message that receives according to receiving element, calculates the Generic Routing Encapsulation bag sequence number of the SDU message that travelling carriage need receive;
Search the unit, be used for the Generic Routing Encapsulation bag sequence number of the SDU message that calculates according to described computing unit, find corresponding SDU message.
Described target BS 32 can also comprise:
Second receiving element is used for the SDU message that the reception sources base station do not send the earliest or do not replied and the piece sequence number of pairing first piece of SDU message before thereof.
Therefore, described positioning unit 322 may further include:
Size between the SDU message that does not send the earliest or do not replied that judging unit, the piece sequence number of the SDU message that is used to judge that travelling carriage reports and source base station are informed and the piece sequence number of each self-corresponding first piece of SDU message before thereof;
Search the unit, be used for judged result, find corresponding SDU message according to described judging unit.
Method and system, base station that the data service that provides by the embodiment of the invention is switched, the base station can be according to the relevant information of the SDU sequence number of feeding back, the SDU message that the location is corresponding also sends to travelling carriage, thereby after having guaranteed that user terminal switches to target BS from source base station, send to the continuity of the data of user terminal.
More than method and system, base station that a kind of data service provided by the present invention is switched be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used to help to understand disclosed technical scheme; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (13)

1. the method that data service is switched is characterized in that, comprising:
Target BS obtains the associated sequence numbers information of the Service Data Unit SDU message of user terminal to send up, between described target BS and described user terminal, be connected when adopting non-automatic repeat requests, described associated sequence numbers information is the SDU sequence number, and the SDU sequence number of described SDU message is by the Generic Routing Encapsulation bag sequence number conversion gained of SDU message;
Target BS is according to the associated sequence numbers information of described SDU message, the SDU message that the location is corresponding, and send data to user terminal from SDU start of heading of described correspondence.
2. the method that data service according to claim 1 is switched is characterized in that, described target BS is according to the associated sequence numbers information of described SDU message, and the corresponding SDU message in location specifically comprises:
Target BS calculates the Generic Routing Encapsulation bag sequence number of described SDU message according to described SDU sequence number;
Target BS obtains corresponding SDU message according to the Generic Routing Encapsulation bag sequence number of calculating gained.
3. the method that data service is switched is characterized in that, comprising:
Be connected between target BS and user terminal when adopting automatic repeat requests, target BS obtains the SDU message that do not send the earliest or do not replied and the sequence number of each self-corresponding first piece of SDU message before thereof from source base station;
Target BS obtains the piece sequence number of the Service Data Unit SDU message of user terminal to send up;
Target BS is according to the piece sequence number of described SDU message, the SDU message that the location is corresponding, and send data to user terminal from SDU start of heading of described correspondence.
4. the method that data service according to claim 3 is switched, it is characterized in that described target BS also comprises from the sequence number that source base station obtains the earliest not transmission or the SDU message of not replied and each self-corresponding first piece of SDU message before thereof before:
Source base station writes down all corresponding relations through the sequence number of the SDU sequence number of the SDU messages of source base stations and each self-corresponding first piece.
5. the method that data service according to claim 4 is switched is characterized in that, described target BS is according to the associated sequence numbers information of described SDU message, and the concrete mode of SDU message that navigates to correspondence is:
Target BS is according to the piece sequence number of the SDU message of user terminal to send up, and the SDU message that does not send the earliest or do not replied that obtains from source base station and the sequence number of each self-corresponding first piece of SDU message before thereof, the SDU message that the location is corresponding.
6. the method that data service according to claim 5 is switched, it is characterized in that, described target BS is according to the piece sequence number of the SDU message of user terminal to send up, and the SDU message that does not send the earliest or do not replied that obtains from source base station and the sequence number of each self-corresponding first piece of SDU message before thereof, the corresponding concrete mode of SDU message in location is:
Forbid segmentation if ARQ connects, then the piece sequence number according to the SDU message of user terminal to send up directly navigates to corresponding SDU message;
If connecting, ARQ uses fragmentation feature, size between the piece sequence number of the SDU message of target BS by judging user terminal to send up and the sequence number of a SDU message that does not send the earliest or do not replied that obtains from source base station and pairing first piece of SDU message before thereof navigates to the particular location of the SDU message of correspondence.
7. the method that data service according to claim 6 is switched is characterized in that, the concrete mode that sends data to user terminal from described SDU start of heading is:
If the piece sequence number Bx of the SDU message of user terminal to send up is greater than the sequence number B1 of first piece of a SDU message before the SDU message that does not send the earliest or do not replied, and sequence number B2 less than first piece of the SDU message that does not send the earliest or do not replied, then target BS begins to send data to user terminal from the ad-hoc location of the SDU message of B1 correspondence, described ad-hoc location is the byte of (Bx-B1) * ARQ data block, and wherein the 0th byte is start byte;
If Bx is less than B1, then send data to user terminal from the SDU start of heading that does not send the earliest or do not replied;
If Bx greater than B2, then carries out abnormality processing.
8. the system that data service is switched is characterized in that, comprising:
User terminal is used to provide the associated sequence numbers information of Service Data Unit SDU message and receives data;
Target BS is used to receive the associated sequence numbers information of the SDU message that user terminal provides, and according to described associated sequence numbers information, the SDU message that the location is corresponding, and send data to user terminal from SDU start of heading of described correspondence,
Be connected when adopting non-automatic repeat requests between target BS and user terminal, described associated sequence numbers information is the SDU sequence number, and the SDU sequence number of described SDU message is by the Generic Routing Encapsulation bag sequence number conversion gained of SDU message.
9. the system that data service according to claim 8 is switched is characterized in that, the system that described data service is switched also comprises:
Source base station is used for the associated sequence numbers information to described user terminal transmission SDU message.
10. a base station is characterized in that, comprising:
First receiving element, be used to receive the associated sequence numbers information of the SDU message that user terminal provides, between target BS and user terminal, be connected when adopting non-automatic repeat requests, described associated sequence numbers information is the SDU sequence number, and the SDU sequence number of described SDU message is by the Generic Routing Encapsulation bag sequence number conversion gained of SDU message;
Positioning unit is used for the associated sequence numbers information of the SDU message that receives according to described first receiving element, navigates to corresponding SDU message;
Transmitting element, the SDU start of heading that is used for the correspondence of locating from described positioning unit, send data to user terminal.
11. base station according to claim 10 is characterized in that, described positioning unit comprises:
Computing unit is used for the associated sequence numbers information according to the SDU message of first receiving element reception, calculates the Generic Routing Encapsulation bag sequence number of the SDU message of user terminal;
Search the unit, be used for the Generic Routing Encapsulation bag sequence number of the SDU message that calculates according to described computing unit, find corresponding SDU message.
12. a base station is characterized in that, comprising:
First receiving element is used to receive the associated sequence numbers information of the SDU message that user terminal provides, and is connected when adopting automatic repeat requests between target BS and user terminal, and described associated sequence numbers information is the piece sequence number;
Positioning unit is used for the associated sequence numbers information of the SDU message that receives according to described first receiving element, navigates to corresponding SDU message;
Transmitting element, the SDU start of heading that is used for the correspondence of locating from described positioning unit, send data to user terminal;
Second receiving element is used for the SDU message that the reception sources base station do not send the earliest or do not replied and the sequence number of each self-corresponding first piece of SDU message before thereof.
13. base station according to claim 12 is characterized in that, described positioning unit comprises:
Judging unit is used to judge the size between the sequence number of the piece sequence number of SDU message of user terminal to send up and the SDU message that does not send the earliest or do not replied that source base station is informed and each self-corresponding first piece of SDU message before thereof;
Search the unit, be used for judged result, find corresponding SDU message according to described judging unit.
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US8767739B2 (en) 2007-08-13 2014-07-01 Qualcomm Incorporated Optimizing in-order delivery of data packets during wireless communication handover
EP3073788B1 (en) 2013-11-21 2018-06-13 Huawei Technologies Co., Ltd. Method and system for selecting target network side device
CN113507718B (en) * 2018-06-25 2023-11-10 华为技术有限公司 Communication method and communication device

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CN1901733A (en) * 2005-07-20 2007-01-24 华为技术有限公司 Method for no-damage switching in radio cut-in technology
CN1960561A (en) * 2005-11-05 2007-05-09 中兴通讯股份有限公司 Method for switching services in wireless cellular communication system

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