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CN101222484A - Method for implementing protocol data unit of wireless links control layer - Google Patents

Method for implementing protocol data unit of wireless links control layer Download PDF

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Publication number
CN101222484A
CN101222484A CNA2007100045676A CN200710004567A CN101222484A CN 101222484 A CN101222484 A CN 101222484A CN A2007100045676 A CNA2007100045676 A CN A2007100045676A CN 200710004567 A CN200710004567 A CN 200710004567A CN 101222484 A CN101222484 A CN 101222484A
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length
header
rlc
rlc sdu
pdu
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张健
阮象华
周晓星
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ZTE Corp
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ZTE Corp
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Abstract

The present invention discloses a realization method for wireless link control layer protocol data unit. The length limit of a configured wireless link control layer protocol data unit RLC PDU is Lmax_PDU. When the sum LSDU_header of the length of a wireless link control layer service data unit RLC PDU and the length of header information is not greater than the Lmax_PDU, the header information is added to an integral RLC SDU for generating an RLC PDU, a value of an HE field in the header information is used to indicate the next field as the content of an integral RLC SDU. When the sum LSDU_header of the length of the RLC SDU length and the header information length is greater than the Lmax_PDU, the integral RLC SDU is segmented and then added to the header information for generating the RLC PDU, and the value of a header extended field HE in the header information is used to indicate the next field information. The present invention decides whether to support that the RLC PDU is generated with the integral and /or segmented RLC SDU in a serial connection mode or not through configuration.

Description

A kind of implementation method of protocol data unit of wireless links control layer
Technical field
The present invention relates to the implementation method of protocol data unit of wireless links control layer in the wireless communication system, relate in particular to the implementation method of the protocol data unit of wireless links control layer that is applicable to the high data rate Packet Service.
Background technology
Insert the wireless chain control layer of WCDMA system wireless Access Network RAN in the 3G (Third Generation) Moblie Wideband Code Division Multiple Access (WCDMA), protocol Data Unit RLC PDU in the respective wireless carrying is default regular length, generates after wireless chain control layer service data unit RLC SDU is carried out segmentation/serial connection/filling processing and increases corresponding header according to described preset length.
The existing method that generates protocol data unit of wireless links control layer RLC PDU, as shown in Figure 1:
If the length of a service data unit SDU surpasses described preset length, then the leading portion from this service data unit partly intercepts described preset length;
If the described preset length of the curtailment of a service data unit SDU, the leading portion that then intercepts next service data unit partly is concatenated into the back segment part of this service data unit;
The remainder of the service data unit that is intercepted under above-mentioned two kinds of situations is as the leading portion part that generates next protocol Data Unit; When remaining service data unit length during, also can fill redundant digit at last at service data unit less than described preset length.
As shown in Figure 2, be the schematic diagram of existing affirmation mode regular length RLC PDU frame structure, wherein:
The D/C field, the type of expression affirmation mode RLC PDU is 1bit; Its value is 0, expression control PDU; Its value is 1, the expression data PDU;
Sequence Number (SN) field is the sequence number of RLC PDU, and for acknowledged mode data PDU, this field length is 12bit;
The P field is used for being 1bit to the report of receiving terminal solicited status; 0 expression does not need status report, and 1 expression needs status report;
The HE field is an expansion type, is 2bit; The later byte of 00 expression is data; The later field of 01 expression is Length Indication LI (Length Indicator) and extension bits E; 10,11 are the reservation position;
Length Indicator (LI) is Length Indication, for affirmation mode RLC PDU, if PDU length is less than or equal to 126 bytes, then is 7bit; If PDU length greater than 126 bytes, then is 15bit;
The E field is extension bits, is 1bit; The next field of 0 expression is data, status PDU incidentally or filler; The next field of 1 expression is Length Indication Length Indicator and extension bits E;
Protocol data unit of wireless links control layer RLC PDU adopts the sliding window mode to send and receive between peer layer, and its peak data rate is subject to protocol Data Unit length, Loop Round Trip Time RTT (Round Trip Time) and length of window.Can improve data rate by the method that increases protocol Data Unit PDU length in theory, lower efficiency, reduce sub-district covering etc. but will increase the filling expense.
In order further to improve data rate and spectrum efficiency on the basis of high-speed downlink packet access HSDPA and high speed uplink packet access HSUPA, the 3G (Third Generation) Moblie partnership projects is organized 3GPP (The 3rd Generation Partnership Project) to propose high-speed packet and is inserted the HSPA evolution items.In this project, for the improvement of radio interface layer 2, the scheme of variable-length protocol data unit of wireless links control layer has been proposed, the main thought of this scheme is: wireless links control layer affirmation mode is supported protocol Data Unit length flexibly; Media access control layer MAC-hs entity is supported the segmentation to protocol data unit of wireless links control layer; Whether media access control layer MAC-e and MAC-es support further research is treated in the segmentation of protocol data unit of wireless links control layer.
The generation principle of variable-length protocol data unit of wireless links control layer is:
Be maximum length restriction of protocol Data Unit PDU definition;
When the length of top service data cell SDU limits less than described maximum length, a protocol Data Unit PDU is made up of a top service data cell (higher layer SDU) and header (header), and this kind mode is: generate a RLCPDU according to a complete RLC SDU;
When the length of top service data cell SDU limits greater than described maximum length, to service data unit SDU according to described maximum length restriction segmentation after, add that header generates a protocol Data Unit PDU, this kind mode is: to generating RLC PDU after the RLC SDU segmentation;
Whether need to support the serial connection of service data unit SDU to treat further research.
Does the problem that needs at present to solve comprises: the maximum length that how to realize protocol Data Unit limit for the variable-length protocol data unit of wireless links control layer scheme in 2 improvement of high-speed packet access HSPA evolution items radio interface layer? support the serial connection of service data unit? how does the frame structure of protocol Data Unit define?
Summary of the invention
Technical problem to be solved by this invention is, a kind of implementation method of protocol data unit of wireless links control layer is provided, generate the protocol data unit of wireless links control layer of variable-length, the restriction of resolution protocol data cell maximum length, the serial connection of service data unit, the problem of implementation of protocol data unit frame structure.
The invention provides a kind of implementation method of protocol data unit of wireless links control layer, comprise the steps:
(1) configuration maximum wireless controlling links layer protocol data cell RLC PDU length restriction L Max_PDU, make its criterion as wireless chain control layer service data unit RLC SDU segmentation;
(2) add the length sum L of header when wireless chain control layer service data unit RLC SDU length SDU_headerBe not more than described L Max_PDUThe time, a complete service data unit RLC SDU is added that header generates a protocol Data Unit RLC PDU, utilizing the later field of value indication of the extended field HE in the header is the content of a complete RLC SDU.
Described method further comprises:
(3) add the length sum L of header when wireless chain control layer service data unit RLC SDU length SDU_headerGreater than described L Max_PDUThe time, to add after the complete service data unit RLC SDU segmentation that header generates a protocol Data Unit RLC PDU, utilizes three values of the extended field HE in the header to indicate later field to be respectively: " first section or non-final stage ", " interlude or non-final stage ", " final stage ".
Described method further comprises:
(4) wireless chain control layer generates a RLC PDU with the RLC SDU after complete RLC SDU and/or the segmentation by the serial connection mode by configuration support.
Described step (1) further comprises:
Described L Max_PDUBeing configured to maximum RLC SDU length adds correspondingly, further comprise the length sum of header in step (2):
All RLC SDU are added that according to a complete RLC SDU header generates a RLCPDU.
Described step (4) further comprises:
When wireless chain control layer is configured to support that the serial connection mode generates RLC PDU, configuration preset length L 1, the default summation length L of configuration 2, for being less than or equal to described L 1Service data unit RLCSDU be connected in series processing, generate a protocol Data Unit RLC PDU to adding header after the RLC SDU serial connection, guarantee that a plurality of RLC SDU are connected in series to handle back length sum and be less than or equal to described L 2
When wireless when connecting circuit control layer and being configured to support that the serial connection mode generates RLC PDU, when service data unit RLC SDU length greater than described preset length L 1And less than default summation length L 2The time, add that according to a complete RLC SDU header generates a RLC PDU and handles, wherein existing protocol is continued to use in the definition of a frame format and an extended field HE;
When wireless when connecting circuit control layer and being configured to support that the serial connection mode generates RLC PDU, when service data unit RLC SDU length greater than described default summation length L 2The time, according to adding after the RLC SDU segmentation that header generates a RLC PDU and handles, wherein existing protocol is continued to use in the definition of a frame format and an extended field HE.
Extended field HE in the described header and the frame format of RLC PDU, when not supporting that the serial connection mode generates RLC PDU,, be two bits HE fields of totally 4 values according to new definition, be used to express the described RLC PDU header content of representative afterwards, wherein:
First value is used to indicate a complete RLC SDU;
Second value, the non-final stage or the interlude that are used to indicate the next RLC SDU of segmentation situation;
The 3rd value, the final stage that is used to indicate the next RLC SDU of segmentation situation;
The 4th value is used to indicate the following first section RLC SDU of segmentation situation or is used for other expanded function as keeping the position.
Extended field HE in the described header and the frame format of RLC PDU, when supporting that the serial connection mode generates RLC PDU, two bits HE field of totally 4 values is adopted in the definition of continuing to use existing protocol, be used to express the described RLC PDU header content of representative afterwards, wherein:
First value, being used to indicate the content of back is data, continues to use the definition of existing protocol;
Second value, being used to indicate later field is Length Indication LI and extension bits E, the definition of continuing to use existing protocol;
The 3rd value keeps the definition of continuing to use existing protocol;
The 4th value keeps the definition of continuing to use existing protocol.
Described step (3) further comprises:
Adding after to service data unit RLC SDU segmentation when header generates a protocol Data Unit RLC PDU, is that every section of a RLC SDU adds that header generates an independent RLCPDU.
Described preset length L 1, be configured to comprise the length behind the header or do not comprise the length of header;
Described default summation length L 2, be configured to comprise the length behind the header or do not comprise the length of header; Perhaps described L 2Be configured to maximum RLC PDU length restriction L Max_PDU
The described service data unit RLC SDU that is connected in series is by the RLC SDU of segmentation and/or complete RLC SDU, wherein:
When only supporting the serial connection of complete RLC SDU, if add after the length of last RLC SDU greater than default summation length L 2The time, then last RLC SDU is not connected in series processing;
When also supporting RLC SDU to segmentation to be connected in series, if add after the length of last RLC SDU greater than default summation length L 2The time, then only the part segmentation of this last RLC SDU is connected in series, make the serial connection total length less than L 2, remaining part segmentation is used to generate the content of next RLCPDU.
The present invention is directed to affirmation mode RLC PDU and realize the problem of required solution, can support a complete RLC SDU to generate a RLC PDU, support again generating RLCPDU after the RLC SDU segmentation, and can determine whether to support by the mode of configuration to be connected in series and generate RLC PDU for little RLC SDU; Simultaneously, the present invention has utilized the RLC PDU frame structure of former version basically, mainly supports variable-length RLC PDU scheme by the part field in the header is redefined, and has better compatibility backward.The needed expense of header is very little among the present invention, has improved the Radio Resource utilization ratio.
Description of drawings
Fig. 1 is the schematic diagram of existing regular length RLC PDU generation method;
Fig. 2 is existing affirmation mode regular length RLC PDU frame structure schematic diagram;
Fig. 3 supports a complete service data unit RLC SDU to add that header generates the schematic diagram of a protocol Data Unit RLC PDU instantiation 1;
Fig. 4 is the frame structure schematic diagram of the RLC PDU that generates in the instantiation 1 shown in Figure 3;
Fig. 5 supports adding after the RLC SDU segmentation that header generates the schematic diagram of a protocol Data Unit RLCPDU instantiation 2;
Fig. 6 is the frame structure schematic diagram of the RLC PDU that generates in the instantiation 2 shown in Figure 5;
Fig. 7 supports adding that header generates the schematic diagram of a protocol Data Unit RLC PDU instantiation 3 after the complete RLC SDU serial connection;
Fig. 8 adds that header generates the schematic diagram of a protocol Data Unit RLC PDU instantiation 3 after the RLC SDU serial connection of supporting segmentation.
Embodiment
Below in conjunction with drawings and the specific embodiments technical solution of the present invention is described in further detail.
The invention provides current high-speed packet inserts in the HSPA evolution items, affirmation mode RLCPDU is realized the complete scheme of the problem of required solution, both supported a complete RLC SDU to generate a RLC PDU, support again generation RLC PDU after the RLC SDU segmentation, and can determine whether to support by the mode of configuration to be connected in series generation RLC PDU for little RLC SDU.
The RLC PDU frame structure of version before the present invention mainly utilizes, frame structure for example shown in Figure 2, support variable-length RLC PDU scheme by the part field in the header (for example HE field) is redefined, thereby can have better compatibility backward.
Main thought of the present invention is as follows:
(1) wireless chain control layer is supported flexibility and changeability length RLC PDU, by disposing maximum RLCPDU length restriction L Max_PDU, make its criterion as RLC PDU segmentation, wherein, the length that maximum RLCPDU length restriction can be configured to maximum RLC SDU add header and length.
(2) wireless chain control layer can determine whether support to be connected in series function by the mode of configuration.
(3) under the situation that wireless chain control layer is configured to not support to be connected in series, described HE field and RLC PDU frame format adopt new definition, use two bits HE field of totally 4 values in the RLC PDU header, be used to express the described RLC PDU header content of representative afterwards.One of them value is used to indicate a complete RLC SDU; A value is used to indicate next non-final stage of RLCSDU of segmentation situation or interlude; A value is used to indicate the final stage of the next RLC SDU of segmentation situation; Value be used to indicate first section of the next RLC SDU of segmentation situation or be preserved for after expand.
(4) under the situation that wireless chain control layer is configured to support to be connected in series, support other two kinds of situations simultaneously: promptly support a certain section of a complete RLC SDU and a RLC SDU to add that header generates the situation of a RLC PDU.The definition of described HE field and the same existing protocol of RLC PDU frame format, can with reference in " background technology " about the description of existing affirmation mode regular length RLC PDU frame structure shown in Figure 2.
The implementation method of protocol data unit of wireless links control layer in the present embodiment mainly may further comprise the steps:
Step 1: at first, dispose maximum wireless controlling links layer protocol data cell RLC PDU length restriction L Max_PDU, make its criterion as RLC SDU segmentation.Can directly dispose by the acquiescence mode and determine described L Max_PDULength, also can add that the length sum of header is as described L by disposing maximum RLC SDU length Max_PDULength.At described L Max_PDUWhen being configured to maximum RLCSDU length and adding header length sum, all RLC SDU all can add that the mode of header generates described RLC PDU by complete RLC SDU.
Step 2: the length sum L that adds header when wireless chain control layer service data unit RLC SDU length SDU_headerBe not more than described L Max_PDUThe time, a complete service data unit RLCSDU is added that header generates a protocol Data Unit RLC PDU, utilizing the later field of value indication of the extended field HE in the header is the content of a complete RLC SDU.
Step 3: the length sum L that adds header when wireless chain control layer service data unit RLC SDU length SDU_headerGreater than described L Max_PDUThe time, to add after the service data unit RLC SDU segmentation that header generates a protocol Data Unit RLC PDU, utilizing the later field of value indication of the extended field HE in the header is the content of a RLC SDU after the segmentation, can be designated as " first section (or non-final stage) ", " interlude (or non-final stage) ", " final stage ".
Support variable-length RLC PDU for wireless chain control layer, comprise following situation:
Support a complete service data unit RLC SDU to add that header generates a protocol Data Unit RLC PDU;
Support adds that header generates a protocol Data Unit RLC PDU after to RLC SDU segmentation;
Mode by configuration determines whether to support to adding after the RLC SDU serial connection that header generates a protocol Data Unit RLC PDU;
Do not need to support filling redundant digit function to RLC SDU.
Wireless chain control layer must support a complete service data unit RLC SDU to add that header generates a protocol Data Unit RLC PDU.
Wireless chain control layer must be supported adding after the RLC SDU segmentation that header generates a protocol Data Unit RLC PDU;
Simultaneously, whether wireless chain control layer also can determine to support to adding after the RLCSDU serial connection that header generates a protocol Data Unit RLC PDU by the mode of configuration.Support to the serial connection mode is optional.
Instantiation 1:
Example 1 generates the situation of a protocol Data Unit RLC PDU for complete service data unit RLC SDU of wireless chain control layer support adds header.
Can dispose or be the length sum L that maximum RLCSDU length adds header by the acquiescence mode by disposing maximum RLC PDU length Max_SDU_headerDetermine described L Max_PDUPerhaps, can be by disposing maximum RLC PDU length for add the length sum L of header less than maximum RLC SDU length Max_SDU_headerCertain be worth and be defined as described L Max_PDU
Add the length sum L of header when wireless chain control layer service data unit RLC SDU length SDU_headerBe not more than described L Max_PDUThe time, a complete service data unit RLC SDU is added that header generates a protocol Data Unit RLC PDU, utilizing the later field of value indication of the extended field HE in the header is the content of a complete RLC SDU.Concrete generating mode can be referring to schematic diagram shown in Figure 3.
The frame structure mode as shown in Figure 4 of the RLC PDU that is generated, wherein, header comprises following field: D/C, Sequence Number (SN), P, HE, DATA, takies 2 BYTE altogether, the wherein definition of HE field is as shown in table 1 as follows:
Table 1: 4 values of the HE field of the frame structure of the RLC PDU that is generated
Value Describe
00 When RLC is configured to not support to be connected in series, represent the RLC PDU that a complete RLC SDU generates, later field is the content of a complete RLC SDU; When RLC was configured to support serial connection, the content of expression back was data, continues to use the definition of existing protocol;
01 When rlc layer was configured to not support to be connected in series, expression first section RLC SDU of segmented mode or non-final stage RLC SDU expanded other and represent meaning after perhaps being left; When rlc layer is configured to support serial connection, represent that later field is Length Indication Length Indicator (LI) and extension bits E, the definition of continuing to use existing protocol;
10 When RLC is configured to not support to be connected in series, the RLC PDU that the non-final stage RLC of expression segmented mode SDU generates, later field is the data content of a RLC SDU part;
When RLC is configured to support serial connection, expansion after this value is preserved for, the definition of continuing to use existing protocol;
11 When RLC is configured to not support to be connected in series, the RLC PDU that expression segmented mode final stage RLC SDU generates, later field is the data content of RLC SDU final stage; When RLC is configured to support serial connection, expansion after this value is preserved for, the definition of continuing to use existing protocol;
When a complete service data unit RLC SDU added that header generates the situation of a protocol Data Unit RLC PDU, HE field value was 00; The DATA field is represented the content of a complete RLCSDU; The definition of all the other fields and shared bit number be with the corresponding field definition of existing WCDMA wireless links control layer affirmation mode data protocol unit, referring in the background technology about the description of Fig. 2.
Add that at shown in Figure 3 one complete service data unit RLC SDU header generates in the protocol Data Unit RLC PDU instantiation 1, after RLC SDU length added header, the length sum was not more than under the situation of the maximum RLC PDU length that is disposed and takes place.When being configured to maximum RLC SDU length, maximum RLCPDU length restriction adds that under the situation of header sum, all length is less than described L Max_PDUThe RLC SDU mode that generates RLC PDU be a complete RLCSDU and add that header generates a RLC PDU.
Instantiation 2:
Example 2 is that the wireless chain control layer support adds that header generates the situation of a protocol Data Unit RLC PDU after to RLC SDU segmentation.
As shown in Figure 5, add the length sum L of header when RLC SDU length SDU_headerGreater than maximum RLC PDU length restriction L Max_PDUThe time, generate a protocol Data Unit RLC PDU to adding header after the RLC SDU segmentation.Every section of a RLC SDU generates an independent RLC PDU after adding header; Perhaps when RLC is configured to support the serial connection mode, can also generate a RLC PDU by the mode that is connected in series with other RLC SDU.
The frame structure of the RLC PDU that segmentation generates as shown in Figure 6, wherein outside the definite division HE of each field of header, all with background technology in consistent about the description of Fig. 2,4 value implications of HE are with consistent shown in the table 1.When RLC was configured to not support to be connected in series mode, the HE field can value be 01,10 or 11; When RLC was configured to support the serial connection mode, the HE field can value 00 or 01;
Add that header generates in the protocol Data Unit RLC PDU instantiation 2 shown in Figure 4 after to RLC SDU segmentation, for the header of RLC PDU, the situation of non-RLC SDU final stage, HE value are 10, be the situation of RLCSDU final stage, the HE value is 11; Under the situation that is configured to not support to be connected in series at rlc layer, HE is value 01 also, first section of expression RLC SDU; Under the situation that is configured to support to be connected in series at rlc layer, the HE value is 00 or 01.In this example 2, the length sum is greater than the maximum RLC PDU length restriction L that is disposed after RLC SDU length adds header Max_PDUSituation under take place.
Instantiation 3:
Example 3 is whether wireless chain control layer can determine to support to adding after the RLCSDU serial connection that header generates a protocol Data Unit RLC PDU by the mode of configuration, in the situation that is configured to support be connected in series.
Can dispose preset length L 1, only to being not more than described preset length L 1RLC SDU be connected in series processing, generate a protocol Data Unit RLC PDU to adding header after the RLC SDU serial connection; Usually the serial connection mode is suitable for the less RLC SDU of length.Described preset length L 1Can be configured to comprise the length behind the header or not comprise the length of header; Simultaneously, can also dispose default summation length L 2, require the length sum that a plurality of RLC SDU are connected in series after the processing still is not more than default summation length L 2Default summation length L 2Can be configured to comprise the length behind the header or not comprise the length of header, described L 2Can be exactly maximum RLC PDU length restriction L Max_PDU
Wherein, the RLC SDU that is connected in series can be by the RLC SDU of segmentation or complete RLCSDU; Can be configured to only support the serial connection of complete RLC SDU, after the length that adds last RLC SDU greater than default summation length L 2The time, then last RLC SDU is not connected in series processing; Can be configured to also support that the RLC SDU to segmentation is connected in series, after the length that adds last RLC SDU greater than default summation length L 2The time, adding that the part segmentation greater than preset length 2 is connected in series behind last RLC SDU, make total length less than described L 2, the part segmentation under unnecessary is used to generate the content of next RLC PDU.
The frame structure of the RLC PDU that is generated, the definition of field and shared Bit number, consistent with the corresponding field definition of existing WCDMA wireless links control layer affirmation mode data protocol unit, referring in " background technology " about the description of Fig. 2.
Fig. 7 and Fig. 8 have illustrated that to adding after the RLC SDU serial connection that header generates a protocol Data Unit RLC PDU embodiment wherein, Fig. 7 has mainly illustrated and supported complete RLCSDU serial connection to generate the situation of RLC PDU; Fig. 8 has illustrated that then a kind of segmentation RLC SDU serial connection supported generates the situation of RLC PDU, and the RLC PDU frame structure that is adopted under two kinds of situations is with shown in Figure 2.
In this execution mode, the length after RLC SDU length adds header (perhaps RLC SDU length) is not more than preset length L 1, and the RLC PDU length (the perhaps RLC SDU length sum after all serial connections) that the serial connection back generates is not more than default summation length L 2Situation under default summation length L takes place 2Can be maximum RLC PDU length restriction L Max_PDU
In the actual embodiment, the concrete value of HE field may be different from the defined value of the present invention, but should comprise the described corresponding function of HE Field Definition of the present invention.The defined length of other relevant field also may be different from the defined value of the present invention, as long as but used corresponding field to describe employed implication, then also within the scope of the invention.
In sum, the present invention has realized variable-length protocol data unit of wireless links control layer RLC PDU, has following obvious technique effect:
(1) provides the complete scheme that in the current high-speed packet access HSPA evolution items affirmation mode RLC PDU is realized the problem of required solution, both supported a complete RLC SDU to generate a RLC PDU, support again generation RLC PDU after the RLC SDU segmentation, and can determine whether to support by the mode of configuration to be connected in series generation RLC PDU for little RLC SDU;
(2) basically utilized the RLC PDU frame structure of former version, main by the part field in the header being redefined to support variable-length RLC PDU scheme have good backwards compatibility;
(3) the needed expense of header is very little, has improved the Radio Resource utilization ratio.

Claims (10)

1. the implementation method of a protocol data unit of wireless links control layer is characterized in that, comprises the steps:
(1) configuration maximum wireless controlling links layer protocol data cell RLC PDU length restriction L Max_PDU, make its criterion as wireless chain control layer service data unit RLC SDU segmentation;
(2) add the length sum L of header when wireless chain control layer service data unit RLC SDU length SDU_headerBe not more than described L Max_PDUThe time, a complete service data unit RLC SDU is added that header generates a protocol Data Unit RLC PDU, utilizing the later field of value indication of the extended field HE in the header is the content of a complete RLC SDU.
2. the method for claim 1 is characterized in that, described method further comprises:
(3) add the length sum L of header when wireless chain control layer service data unit RLC SDU length SDU_headerGreater than described L Max_PDUThe time, to add after the complete service data unit RLC SDU segmentation that header generates a protocol Data Unit RLC PDU, utilizes three values of the extended field HE in the header to indicate later field to be respectively: " first section or non-final stage ", " interlude or non-final stage ", " final stage ".
3. method as claimed in claim 1 or 2 is characterized in that, described method further comprises:
(4) wireless chain control layer generates a RLC PDU with the RLC SDU after complete RLC SDU and/or the segmentation by the serial connection mode by configuration support.
4. the method for claim 1 is characterized in that, described step (1) further comprises:
Described L Max_PDUBe configured to maximum RLC SDU length and add the length sum of header;
Correspondingly, in step (2), further comprise:
All RLC SDU are added that according to a complete RLC SDU header generates a RLCPDU.
5. method as claimed in claim 3 is characterized in that, described step (4) further comprises: when wireless chain control layer is configured to support that the serial connection mode generates RLC PDU, and configuration preset length L 1, the default summation length L of configuration 2, for being less than or equal to described L 1Service data unit RLCSDU be connected in series processing, generate a protocol Data Unit RLC PDU to adding header after the RLC SDU serial connection, guarantee that a plurality of RLC SDU are connected in series to handle back length sum and be less than or equal to described L 2
When wireless when connecting circuit control layer and being configured to support that the serial connection mode generates RLC PDU, when service data unit RLC SDU length greater than described preset length L 1And less than default summation length L 2The time, add that according to a complete RLC SDU header generates a RLC PDU and handles, wherein existing protocol is continued to use in the definition of a frame format and an extended field HE;
When wireless when connecting circuit control layer and being configured to support that the serial connection mode generates RLC PDU, when service data unit RLC SDU length greater than described default summation length L 2The time, according to adding after the RLC SDU segmentation that header generates a RLC PDU and handles, wherein existing protocol is continued to use in the definition of a frame format and an extended field HE.
6. method as claimed in claim 1 or 2, it is characterized in that, extended field HE in the described header and the frame format of RLC PDU, when not supporting that the serial connection mode generates RLC PDU, according to new definition, be two bits HE fields of totally 4 values, be used to express the described RLC PDU header content of representative afterwards, wherein:
First value is used to indicate a complete RLC SDU;
Second value, the non-final stage or the interlude that are used to indicate the next RLC SDU of segmentation situation;
The 3rd value, the final stage that is used to indicate the next RLC SDU of segmentation situation;
The 4th value is used to indicate the following first section RLC SDU of segmentation situation or is used for other expanded function as keeping the position.
7. method as claimed in claim 5, it is characterized in that, extended field HE in the described header and the frame format of RLC PDU, when supporting that the serial connection mode generates RLC PDU, continue to use the definition of existing protocol, adopt two bits HE field of totally 4 values, be used to express the described RLC PDU header content of representative afterwards, wherein:
First value, being used to indicate the content of back is data, continues to use the definition of existing protocol;
Second value, being used to indicate later field is Length Indication LI and extension bits E, the definition of continuing to use existing protocol;
The 3rd value keeps the definition of continuing to use existing protocol;
The 4th value keeps the definition of continuing to use existing protocol.
8. method as claimed in claim 2 is characterized in that, described step (3) further comprises:
Adding after to service data unit RLC SDU segmentation when header generates a protocol Data Unit RLC PDU, is that every section of a RLC SDU adds that header generates an independent RLCPDU.
9. method as claimed in claim 5 is characterized in that:
Described preset length L 1, be configured to comprise the length behind the header or do not comprise the length of header;
Described default summation length L 2, be configured to comprise the length behind the header or do not comprise the length of header; Perhaps described L 2Be configured to maximum RLC PDU length restriction L Max_PDU
10. method as claimed in claim 5 is characterized in that, the described service data unit RLC SDU that is connected in series is by the RLC SDU of segmentation and/or complete RLC SDU, wherein:
When only supporting the serial connection of complete RLC SDU, if add after the length of last RLC SDU greater than default summation length L 2The time, then last RLC SDU is not connected in series processing;
When also supporting RLC SDU to segmentation to be connected in series, if add after the length of last RLC SDU greater than default summation length L 2The time, then only the part segmentation of this last RLC SDU is connected in series, make the serial connection total length less than L 2, remaining part segmentation is used to generate the content of next RLCPDU.
CNA2007100045676A 2007-01-09 2007-01-09 Method for implementing protocol data unit of wireless links control layer Pending CN101222484A (en)

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