CN102237948A - Methods and devices for transmitting and receiving service data - Google Patents

Methods and devices for transmitting and receiving service data Download PDF

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Publication number
CN102237948A
CN102237948A CN2010101556539A CN201010155653A CN102237948A CN 102237948 A CN102237948 A CN 102237948A CN 2010101556539 A CN2010101556539 A CN 2010101556539A CN 201010155653 A CN201010155653 A CN 201010155653A CN 102237948 A CN102237948 A CN 102237948A
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pdu
variable length
length
sent
sdu
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高财
贺元才
邓清珊
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Huawei Device Co Ltd
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Huawei Device Co Ltd
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Priority to CN2010101556539A priority Critical patent/CN102237948A/en
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Abstract

The embodiment of the invention discloses methods and devices for transmitting and receiving service data. The method for transmitting service data comprises the following steps of: at a transmitting end, when all variable-length PDUs (Protocol Data Units) in service data on one link are not more than 126 bytes, setting a length indicator (LI) as a 7-digit indicator and informing a receiving end of the length of the LI; otherwise, setting the LI as a 15-digit indicator and informing the receiving end of the length of the LI; encapsulating an SDU (Service Data Unit) to be transmitted into a variable-length PDU; and transmitting the encapsulated variable-length PDU to the receiving end. The method for receiving service data comprises the following steps of: correspondingly, receiving a notification message carrying the length of the LI at the receiving end; and when the variable-length PDU to be received is more than 126 bytes and if the length of the LI in the notification message is a 15-digit indicator, receiving the variable-length PDU to be received, and otherwise, discarding the variable-length PDU to be received. According to the embodiment of the invention, the relation between the length of the LI and the variable-length RLC (Radio Link Control) PDU can be definitely specified during practical transmitting and receiving of the service data.

Description

A kind of sending, receiving method of business datum and device
Technical field
The present invention relates to communication technical field, particularly relate to a kind of sending, receiving method and device of business datum.
Background technology
Flourish along with wireless bandwidth, 3G technology also constantly develops, and the more and more higher speed of eating dishes without rice or wine is provided.Wherein, in the development of WCDMA (Wideband Code Division Multiple Access, the bandwidth code division multiple access inserts), available upstream rate of R99 version and downstream rate are respectively 384Kbps and 384Kbps; The R5 version has been introduced HSDPA (High Speed Downlink Packet Access, high speed downlink packet inserts), makes downstream rate reach as high as 14.4Mbps; The R6 version has been introduced HSUPA (High Speed Uplink Packet Access, high speed uplink packet inserts), makes upstream rate reach as high as 5.76Mbps; The R7 version has been introduced HSPA+, makes downstream rate reach as high as 21Mbps.
Along with the upgrading of various version, the speed of business datum is more and more higher, and terminal data volume to be processed is also increasing, and is also more and more higher to the performance requirement of terminal processes data.For fear of the performance bottleneck of terminal processing capacity, the link layer in the R7 version has been introduced layer two and has been strengthened characteristic, and then has reduced the time delay to the requirement and the transmission of terminal processing capacity.Especially, for supporting layer two strengthens characteristic, also introduced descending variable length PDU (Protocol DataUnit, protocol Data Unit) in RLC (RadioLink Control, the Radio Link control) agreement.The size of descending variable length PDU no longer is a fixing Configuration Values, but a dynamic numerical value interval.
When network side when end side sends descending variable length PDU, need by a LI (LengthIndicatior, length indicator) informs SDU (the ServerData Unit that carries among the descending variable length PDU of end side, Service Data Unit) end position, the size of the SDU that is carried in variable length PDU also is variable, therefore, the length of the LI of indication SDU end position is also just different, as, indicate with regard to needing long LI for bigger SDU, indicate with regard to needing short LI for less SDU.But the inventor finds under study for action, in the prior protocols standard, does not clearly stipulate the relation between LI length and the variable length PDU size, causes can't really realizing in practice the transmission and the reception of downlink service data.
Summary of the invention
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of sending, receiving method and device of business datum, in the transmission and reception that clearly are defined in actual downlink service data, and the relation between LI length and the variable length PDU.
The embodiment of the invention discloses following technical scheme:
A kind of sending method of business datum, comprise: when all variable length protocol Data Unit PDU are not more than 126 bytes in the business datum on the link, be used to indicate the length indicator LI of the end position of Service Data Unit SDU to be sent to be set to 7, and the length of described LI is notified to receiving terminal; Otherwise, be used to indicate the LI of the end position of SDU to be sent to be set to 15, and the length of described LI be notified to receiving terminal; SDU to be sent is packaged into variable length PDU; Variable length PDU after the encapsulation is sent to receiving terminal.
A kind of method of reseptance of business datum comprises: the notification message that receives the length of carrying length indicator LI; As variable length PDU to be received during greater than 126 bytes, if the length of LI is 15 in the notification message, receive variable length PDU described to be received, otherwise, abandon variable length PDU described to be received.
A kind of dispensing device of business datum, comprise: first notification unit, be used for when all variable length protocol Data Unit PDU of the business datum on the link are not more than 126 bytes, be used to indicate the length indicator LI of the end position of Service Data Unit SDU to be sent to be set to 7, and the length of described LI is notified to receiving terminal; Second notification unit is used for when the not all variable length PDU of the business datum on the link is not more than 126 bytes, is used to indicate the LI of the end position of SDU to be sent to be set to 15, and the length of described LI is notified to receiving terminal; Encapsulation unit is used for SDU to be sent is packaged into variable length PDU; Transmitting element is used for the variable length PDU after the encapsulation is sent to receiving terminal.
A kind of receiving system of business datum comprises: the notification message receiving element is used to receive the notification message of the length of carrying length indicator LI; The business datum receiving element is used for if the length of LI is 15 in the notification message, receiving variable length PDU described to be received as variable length PDU to be received during greater than 126 bytes, otherwise, abandon variable length PDU described to be received.
As can be seen from the above-described embodiment, at transmitting terminal, when SDU to be sent is packaged into variable length PDU, if all variable length PDU are not more than 126 bytes in the business datum on link, LI is set to 7, otherwise LI is set to 15, on this basis, the variable length PDU after the encapsulation is sent to receiving terminal.Correspondingly,, behind the notification message that receives the length of carrying LI, when the length coupling of LI in the size of variable length PDU to be received and the notification message, receive variable length PDU to be received,, then abandon variable length PDU to be received if do not match at receiving terminal.Thereby clearly stipulate the relation between LI length and the variable length PDU, in the transmission and the reception that realize real realization downlink service data in service.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of an embodiment of the sending method of a kind of business datum of the present invention;
Fig. 2 is the structural representation of a kind of variable length PDU of the present invention;
Fig. 3 is the structural representation of the another kind of variable length PDU of the present invention;
Fig. 4 is the flow chart of an embodiment of the method for reseptance of a kind of business datum of the present invention;
Fig. 5 is the flow chart of an embodiment of the transmission method of a kind of variable length PDU of the present invention;
Fig. 6 is the structure chart of an embodiment of the dispensing device of a kind of business datum of the present invention;
Fig. 7 is the structure chart of an embodiment of the receiving system of a kind of business datum of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the embodiment of the invention is described in detail below in conjunction with accompanying drawing.
Embodiment one
See also Fig. 1, it is the flow chart of an embodiment of the sending method of a kind of business datum of the present invention, and this method may further comprise the steps:
Step 101: when all variable length protocol Data Unit PDU are not more than 126 bytes in the business datum on the link, be used to indicate the length indicator LI of the end position of Service Data Unit SDU to be sent to be set to 7, and the length of described LI is notified to receiving terminal;
For example, when setting up a link, before the business datum that sends on this link, the size of variable length PDU in the prediction business datum, when all PDU were not more than 126 bytes, LI was set to 7, and the length of LI is notified to receiving terminal.Suppose to include altogether in the business datum on certain link 100 variable length PDU, wherein, when 100 variable length PDU were not more than 126 bytes all, LI was set to 7, and the length of LI is notified to receiving terminal.
Step 102: when not all variable length PDU is not more than 126 bytes in the business datum on the link, is used to indicate the LI of the end position of SDU to be sent to be set to 15, and the length of described LI is notified to receiving terminal;
For example, when setting up a link, before the business datum that sends on this link, the size of variable length PDU in the prediction business datum, when not all PDU is not more than 126 bytes, LI is set to 15, and the length of LI is notified to receiving terminal.Suppose to include altogether in the business datum on certain link 100 variable length PDU, wherein, 80 variable length PDU are greater than 126 bytes, and 20 variable length PDU are not more than 126 bytes; Perhaps, 100 variable length PDU are during greater than 126 bytes, and LI is set to 15, and the length of LI is notified to receiving terminal.
Step 103: SDU to be sent is packaged into variable length PDU;
Wherein, described Service Data Unit SDU to be sent is packaged into variable length protocol Data Unit PDU, comprises: described SDU to be sent is put into payload field; Add the frame head of variable length PDU on the basis of described payload field, comprise described LI in the frame head of described variable length PDU, when all variable length PDU were not more than 126 bytes in the business datum on the link, the length of described LI was 7.
For example, see also Fig. 2, it is the structural representation of a kind of variable length protocol Data Unit PDU among the present invention.As shown in Figure 2, the 0th of first byte in the PDU frame head is D/C (Data/Control, data/signaling) flag bit, and being used to indicate this variable length PDU is data PDU or control PDU; If data PDU, in back 7 and second byte of first byte in the PDU frame head preceding 5 totally 12 be the sequence number (Seauence Number) of this variable length PDU; The 5th of second byte in the PDU frame head is P (Polling, poll) flag bit, is used for indication when transmitting terminal sends to receiving terminal (being terminal herein) with variable length PDU, and receiving terminal need respond transmitting terminal; Two of the 6-7 of second byte in the PDU frame head are HE (Header Extension Type, header extension type) flag bit, are used in reference to be shown in whether comprise LI (Length Indicator, length indicator) among this variable length PDU; When HE indication includes LI in this variable length PDU, and variable length PDU is when being not more than 126 bytes, and preceding 7 of the 3rd byte in the PDU frame head is the LI flag bit, utilizes the LI of 7 bit lengths to indicate the position of last byte in PDU of SDU; The 7th of the 3rd byte in the PDU frame head is an E (Extension Byte, extended bit) flag bit, is used in reference to and is shown in the LI that whether also has other among this variable length PDU.As, when SDU of variable length PDU carrying, then in E, there is not other LI among this variable length of indication PDU.After frame head, be payload field, be used to carry SDU to be sent.After payload field,, then fill in the affirmation information of transmitting terminal to receiving terminal if also have remainder bytes.When SDU to be sent less, in order to improve the utilance that number passes passage, in the time of need in variable length PDU, carrying a plurality of less SDU simultaneously and send together, when carrying two SDU simultaneously, then comprise two E flag bits among this variable length PDU, in first E flag bit, also there is other LI among this variable length of indication PDU, in second E flag bit, indicates the LI that does not have other among this variable length PDU.
Need to prove, network equipment RNC as transmitting terminal, when SDU is sent to terminal by descending variable length PDU, earlier SDU to be sent is put into payload field, on the basis of described payload field, add the frame head of variable length PDU again, comprised the LI of the end position that is used to indicate described SDU to be sent in the frame head of this variable length PDU.If all variable length PDU are not more than 126 bytes in the business datum on link, then the length of LI is set to 7.
Wherein, described with Service Data Unit SDU encapsulated layer variable length protocol Data Unit PDU to be sent, comprising: described SDU to be sent is put into payload field; Add the frame head of variable length PDU on the basis of described payload field, comprise described LI in the frame head of described variable length PDU, when not all variable length PDU was not more than 126 bytes in the business datum on the link, the length of described LI was 15.
For example, when the HE indication includes LI in variable length PDU, and when not all variable length PDU is not more than 126 bytes in the business datum on link, as, all variable length PDU are greater than 126 bytes in the business datum on link, the LI that then in E, has other among this variable length of indication PDU, as shown in Figure 3, have after the 3rd byte byte totally 8 all be LI, add in the 3rd byte preceding 7 totally 15 for LI, utilize the LI of 15 bit lengths to indicate the end position of SDU among the variable length PDU.Equally, after frame head, be payload field, be used to carry SDU to be sent.After payload field,, then fill in the affirmation information of transmitting terminal to receiving terminal if also have remainder bytes.
Need to prove, network equipment as transmitting terminal, when SDU to be sent is sent to terminal by descending variable length PDU, earlier business datum to be sent is put into payload field, on the basis of described payload field, add the frame head of variable length PDU again, the LI that has comprised the end position that is used to indicate described SDU to be sent in the frame head of this variable length PDU, if not all variable length PDU is not more than 126 bytes in the business datum on link, LI is set to 15.
Step 104: the variable length PDU after will encapsulating sends to receiving terminal.
What also need to further specify is that the executive agent in the above-mentioned steps 101 and 102 can be the RNC (Radio Network Controller, radio network controller) that is positioned at network side, also can be other logical functional entities identical with the RNC function.
As can be seen from the above-described embodiment, at transmitting terminal, when SDU to be sent is packaged into variable length PDU, if all variable length PDU are not more than 126 bytes in the business datum on link, LI is set to 7, otherwise LI is set to 15, on this basis, the variable length PDU after the encapsulation is sent to receiving terminal.Thereby clearly stipulate the relation between LI length and the variable length PDU, in the transmission that realizes real realization downlink service data in service.
Embodiment two
Corresponding with the sending method of above-mentioned a kind of business datum, the embodiment of the invention also provides a kind of method of reseptance of business datum, sees also Fig. 4, and it comprises for the method for reseptance of a kind of business datum of the present invention, this method of reseptance:
Step 401: the notification message that receives the length of carrying length indicator LI;
Step 402: as variable length PDU to be received during,, receive variable length PDU described to be received if the length of LI is 15 in the notification message greater than 126 bytes, otherwise, abandon variable length PDU described to be received.
In above-mentioned steps 402, when the size of the variable length PDU to be received that the LI length that obtains from the notification message that receives when receiving terminal and receiving terminal obtain through prediction is mated, receiving terminal just receives variable length PDU described to be received, otherwise, abandon variable length PDU described to be received.Be specially: when the prediction variable length PDU to be received greater than 126 bytes, and when the length of the LI in the notification message is 15, think the size coupling of the LI length that obtains and variable length PDU to be received from notification message, if the length of the LI in the notification message is 7, then think not match.
As can be seen from the above-described embodiment, at receiving terminal, behind the notification message that receives the length of carrying LI, when the length coupling of LI in the size of variable length PDU to be received and the notification message, the variable length PDU that reception is to be received if do not match, then abandons variable length PDU to be received.Thereby clearly stipulate the relation between U length and the variable length PDU, in the reception that realizes real realization downlink service data in service.
Embodiment three
Below respectively from network side to the transmission of business datum and end side to the reception of business datum describe in detail Service Data Unit is carried on variable length PDU after, to one of variable length PDU complete transmission course, see also Fig. 5, it is the flow chart of an embodiment of the transmission method of a kind of variable length PDU of the present invention, may further comprise the steps:
Step 501: before the business datum on sending a link, judge whether all variable length PDU all are not more than 126 bytes in the business datum on this link, if, enter step 502, if not, enter step 503;
Step 502: be used to indicate the length indicator LI of the end position of SDU to be sent to be set to 7, enter step 504;
Step 503: be used to indicate the length indicator LI of the end position of SDU to be sent to be set to 15, enter step 504;
Step 504: the length of LI is notified to terminal;
Step 505:RNC puts into Service Data Unit SDU to be sent the payload field of variable length PDU;
Wherein,, just a SDU need be divided into multistage, be packaged into a plurality of PDU respectively and send if the bandwidth of lower floor's passage can not satisfy the demand of transmitting a complete SDU; After receiving terminal is again with these PDU decapsulations, ressemble into SDU.Perhaps,,, need in variable length PDU, carry a plurality of less SDU simultaneously and send together, again with the PDU decapsulation that receives, a plurality of SDU be separated at receiving terminal in order to improve the utilance that number passes passage if SDU to be sent is less.
Step 506: on the basis of described payload field, add the frame head of variable length PDU, comprise described LI in the frame head of described variable length PDU;
Step 507: terminal receives the notification message that RNC sends, the length of carrying the LI among the variable length PDU that remains to be received in notification message;
Step 508: whether the length of the LI that terminal judges receives mates with the size of variable length PDU to be received, if, enter step 509, if not, enter step 510;
Wherein, as the variable length PDU to be received of prediction during greater than 126 bytes, if the length of LI is 15 in the notification message, then the result is coupling, if the length of LI is 7 in the notification message, the result is not for matching.
Step 509: receive variable length PDU described to be received, process ends;
Step 510: abandon variable length PDU described to be received, process ends.
As can be seen from the above-described embodiment, at transmitting terminal, when SDU to be sent is packaged into variable length PDU, if all variable length PDU are not more than 126 bytes in the business datum on link, LI is set to 7, otherwise LI is set to 15, on this basis, the variable length PDU after the encapsulation is sent to receiving terminal.Correspondingly,, behind the notification message that receives the length of carrying LI, when the length coupling of LI in the size of variable length PDU to be received and the notification message, receive variable length PDU to be received,, then abandon variable length PDU to be received if do not match at receiving terminal.Thereby clearly stipulate the relation between LI length and the variable length PDU, in the transmission and the reception that realize real realization downlink service data in service.
Embodiment four
Corresponding with the sending method of above-mentioned a kind of business datum, the embodiment of the invention also provides a kind of dispensing device of business datum.See also Fig. 6, it comprises: first notification unit 601, second notification unit 602, encapsulation unit 603 and transmitting element 604 for the structure chart of an embodiment of the dispensing device of a kind of business datum of the present invention.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
First notification unit 601, be used for when all variable length protocol Data Unit PDU of the business datum on the link are not more than 126 bytes, be used to indicate the length indicator LI of the end position of Service Data Unit SDU to be sent to be set to 7, and the length of described LI is notified to receiving terminal;
Second notification unit 602 is used for when the not all variable length PDU of the business datum on the link is not more than 126 bytes, is used to indicate the LI of the end position of SDU to be sent to be set to 15, and the length of described LI is notified to receiving terminal;
Encapsulation unit 603 is used for SDU to be sent is packaged into variable length PDU;
Transmitting element 604: the variable length PDU after will encapsulating sends to receiving terminal.
Wherein, encapsulation unit 603 comprises: the Data-carrying subelement 6031 and first frame head add subelement 6032,
Data-carrying subelement 6031, the Data-carrying subelement is used for described SDU to be sent is put into payload field;
First frame head adds subelement 6032, be used on the basis of described payload field, adding the frame head of variable length PDU, comprise described LI in the frame head of variable length PDU, when all variable length PDU were not more than 126 bytes in the business datum on the link, the length of described LI was 7.
Interchangeable, above-mentioned transmitting element 603 comprises: the Data-carrying subelement and second frame head add subelement,
The Data-carrying subelement is used for described SDU to be sent is put into payload field;
Second frame head adds subelement, be used on the basis of described payload field, adding the frame head of variable length PDU, comprise described LI in the frame head of described variable length PDU, when not all variable length PDU was not more than 126 bytes in the business datum on the link, the length of described LI was 15.
As can be seen from the above-described embodiment, at transmitting terminal, when SDU to be sent is packaged into variable length PDU, if all variable length PDU are not more than 126 bytes in the business datum on link, LI is set to 7, otherwise LI is set to 15, on this basis, the variable length PDU after the encapsulation is sent to receiving terminal.Thereby clearly stipulate the relation between LI length and the variable length PDU, in the transmission that realizes real realization downlink service data in service.
Embodiment five
Corresponding with the method for reseptance of above-mentioned a kind of business datum, the embodiment of the invention also provides a kind of receiving system of business datum.See also Fig. 7, it comprises: notification message receiving element 701 and business datum receiving element 702 for the structure chart of an embodiment of the receiving system of a kind of business datum of the present invention.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
Notification message receiving element 701 is used to receive the notification message that carries length indicator LI length;
Business datum receiving element 702 is used for if the length of LI is 15 in the notification message, receiving variable length PDU described to be received as variable length PDU to be received during greater than 126 bytes, otherwise, abandon variable length PDU described to be received.
As can be seen from the above-described embodiment, correspondingly, at receiving terminal, behind the notification message that receives the length of carrying LI, when the length coupling of LI in the size of variable length PDU to be received and the notification message, the variable length PDU that reception is to be received if do not match, then abandons variable length PDU to be received.Thereby clearly stipulate the relation between LI length and the variable length PDU, in the reception that realizes real realization downlink service data in service.
Need to prove, one of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random AccessMemory, RAM) etc.
More than the sending, receiving method and the device of a kind of business datum provided by the present invention is described in detail, used specific embodiment herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; 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 (8)

1. the sending method of a business datum is characterized in that, comprising:
When all variable length protocol Data Unit PDU are not more than 126 bytes in the business datum on the link, be used to indicate the length indicator LI of the end position of Service Data Unit SDU to be sent to be set to 7, and the length of described LI is notified to receiving terminal;
Otherwise, be used to indicate the LI of the end position of SDU to be sent to be set to 15, and the length of described LI be notified to receiving terminal;
SDU to be sent is packaged into variable length PDU;
Variable length PDU after the encapsulation is sent to receiving terminal.
2. method according to claim 1 is characterized in that, describedly SDU to be sent is packaged into variable length PDU comprises:
Described SDU to be sent is put into payload field;
Add the frame head of variable length PDU on the basis of described payload field, comprise described LI in the frame head of described variable length PDU, when all variable length PDU were not more than 126 bytes in the business datum on the link, the length of described LI was 7.
3. method according to claim 1 is characterized in that, described SDU encapsulated layer variable length PDU to be sent is comprised:
Described SDU to be sent is put into payload field;
Add the frame head of variable length PDU on the basis of described payload field, comprise described LI in the frame head of described variable length PDU, when not all variable length PDU was not more than 126 bytes in the business datum on the link, the length of described LI was 15.
4. the method for reseptance of a business datum is characterized in that, comprising:
The notification message of the length of length indicator LI is carried in reception;
As variable length PDU to be received during greater than 126 bytes, if the length of LI is 15 in the notification message, receive variable length PDU described to be received, otherwise, abandon variable length PDU described to be received.
5. the dispensing device of a business datum is characterized in that, comprising:
First notification unit, be used for when all variable length protocol Data Unit PDU of the business datum on the link are not more than 126 bytes, be used to indicate the length indicator LI of the end position of Service Data Unit SDU to be sent to be set to 7, and the length of described LI is notified to receiving terminal;
Second notification unit is used for when the not all variable length PDU of the business datum on the link is not more than 126 bytes, is used to indicate the LI of the end position of SDU to be sent to be set to 15, and the length of described LI is notified to receiving terminal;
Encapsulation unit is used for SDU to be sent is packaged into variable length PDU;
Transmitting element is used for the variable length PDU after the encapsulation is sent to receiving terminal.
6. device according to claim 5 is characterized in that, described encapsulation unit comprises:
The Data-carrying subelement is used for described SDU to be sent is put into payload field;
First frame head adds subelement, be used on the basis of described payload field, adding the frame head of variable length PDU, comprise described LI in the frame head of described variable length PDU, when all variable length PDU were not more than 126 bytes in the business datum on the link, the length of described LI was 7.
7. device according to claim 5 is characterized in that, described transmitting element comprises:
The Data-carrying subelement is used for described SDU to be sent is put into payload field;
Second frame head adds subelement, be used on the basis of described payload field, adding the frame head of variable length PDU, comprise described LI in the frame head of described variable length PDU, when not all variable length PDU was not more than 126 bytes in the business datum on the link, the length of described LI was 15.
8. the receiving system of a business datum is characterized in that, comprising:
The notification message receiving element is used to receive the notification message of the length of carrying length indicator LI;
The business datum receiving element is used for if the length of LI is 15 in the notification message, receiving variable length PDU described to be received as variable length PDU to be received during greater than 126 bytes, otherwise, abandon variable length PDU described to be received.
CN2010101556539A 2010-04-22 2010-04-22 Methods and devices for transmitting and receiving service data Pending CN102237948A (en)

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Application publication date: 20111109