CN101883389A - RLC SDU length indicating method and device - Google Patents
RLC SDU length indicating method and device Download PDFInfo
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- CN101883389A CN101883389A CN2009100838732A CN200910083873A CN101883389A CN 101883389 A CN101883389 A CN 101883389A CN 2009100838732 A CN2009100838732 A CN 2009100838732A CN 200910083873 A CN200910083873 A CN 200910083873A CN 101883389 A CN101883389 A CN 101883389A
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Abstract
The invention relates to wireless communication technology, in particular to a method and a device for indicating RLC SDU length, which solve the problem of data loss caused by upper layer buffer overflowing which happens when a plurality of ultra long RLC SDUs, which may lead to upper layer data packet congestion, exist in the conventional RLC PDU in which the lengths of ultra long RLC SDUs cannot be identified in the prior art. The method of the embodiment comprises: determining a group of indication domains corresponding to RLC SDUs of which the lengths exceed a preset threshold in an extended part of a protocol data unit (RLC PDU) of a radio link control layer; and storing the first length indication information of the RLC SDUs of which the lengths exceed the threshold in at least two indication domains in a corresponding group of indication domains, wherein the first length indication information indicates the whole length of the RLC SDUs. When the method of the embodiment of the invention is used, the upper layer data packet congestion is avoided and data loss is avoided.
Description
Technical field
The present invention relates to wireless communication technology, the method and apparatus of particularly a kind of indication RLC SDU (Radio LinkControl Service Data Unit, the Service Data Unit of wireless chain control layer) length.
Background technology
The protocol stack structure of LTE (Long Term Evolution, Long Term Evolution) system, shown in Figure 1A, the LTE system comprises UE (terminal), eNB (base station) and MME (Mobility Management Entity, Mobility Management Entity).
LTE system protocol stack architecture comprises: NAS (Non-Access Stratum, non-access) layer; RRC (Radio Resource Control, Radio Resource control) layer; PDCP (Packet Data ConvergenceProtocol, packet data polymerized agreement) layer; RLC (control of Radio Link Control Radio Link) layer; MAC (Media Access Control, media access control layer) and PHY (Physical, physics) layer.
Rlc layer will be assembled into RLCPDU (Radio Link Control Protocol Data Unit, the protocol Data Unit of wireless chain control layer) (claiming MAC SDU again) from the RLC SDU (claiming PDCP PDU again) that the PDCP layer receives, and send to the MAC layer.
Because the size of RLC PDU is indicated by the MAC layer in the current LTE standard, therefore, when the size of carry-on data field among the RLC PDU that length and the MAC layer of RLCSDU are indicated does not match, rlc layer need carry out segmentation and/or serial connection to the RLC SDU that receives from high level, with the size of the RLC PDU that adapts to MAC layer indication.
According to the different transmission mode of rlc layer, RLC PDU is divided into number of different types.With RLC AMDPDU is example, and shown in Figure 1B, the PDU head constitutes (expansion only can appear among the PDU that needs) by standing part (appearing among each PDU) and expansion two parts among the RLC AMD PDU.Standing part is by the D/C territory, and RF territory, P territory, FI territory, E territory, LSF territory, SO territory constitute (according to the PDU type different, there are some difference in the composition of data field) with the SN territory.Expansion is made up of one or more E territory and LI territory.
All corresponding LI territory, each E territory of expansion is used to indicate whether corresponding back, LI territory is RLC SDU.A LI territory is corresponding with a RLC SDU, is used to indicate the length of corresponding RLC SDU.
The indicating length in the LI territory among the RLC PDU is 2047 bytes, and the maximum PDCP SDU size that allows is 8188 bytes in the current standard, and promptly formed RLC SDU size can surpass 2047.Because the length that the RLC SDU (being that length surpasses 2047 bytes) of overlength can not be indicated in present LI territory so the RLC SDU of regulation overlength can only be placed on the last of RLC PDU, and does not have corresponding LI territory.
Because the RLC SDU of overlength can only be placed on the last of RLC PDU, so can only put the RLC SDU of an overlength among RLC PDU, if the RLC SDU of a plurality of overlength is arranged, to need a plurality of RLC PDU the RLC SDU of these overlength could be sent so and finish, promptly TTI need transmit a plurality of RLCPDU.The setting in the SN space of current RLC PDU is to design according to the situation that sends 1-2 RLC PDU in the TTI.Like this, the interior RLC PDU who sends of TTI might cause send window to pause too much, be transmitting terminal because the RLC PDU that TTI sends is too much, the re-transmission send window of HARQ or ARQ process data bag can not in time obtain upgrading, thereby can not send new data.This situation of long-time appearance may cause the packet on upper strata (as: PDCP layer) congested, and then cause loss of data because of the upper strata buffer memory overflows.
In sum, because the present length that can not indicate the RLC SDU of overlength among the RLC PDU, when a plurality of overlength RLC SDU is arranged, might cause the upper layer data bag congested, and then cause loss of data because of the upper strata buffer memory overflows.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus of the RLC of indication SDU length, in order to solve the length that to indicate the RLC SDU of overlength among the present RLC PDU that exists in the prior art, when a plurality of overlength RLC SDU is arranged, might cause the upper layer data bag congested, and then overflow the problem that causes loss of data because of the upper strata buffer memory.
A kind of method of indicating the Service Data Unit RLC SDU length of wireless chain control layer that the embodiment of the invention provides, this method comprises:
From the expansion of the protocol Data Unit RLC pdu header of wireless chain control layer, determine that length surpasses one group of indication territory of the RLC SDU correspondence of setting threshold;
To place at least two indication territories in one group of corresponding indication territory above the first Length Indication information of the RLC SDU of setting threshold, whole length of described first Length Indication information indication RLC SDU.
A kind of device of indicating the Service Data Unit RLC SDU length of wireless chain control layer that the embodiment of the invention provides, this device comprises:
First determination module is used for from the expansion of the protocol Data Unit RLC pdu header of wireless chain control layer, determines that length surpasses one group of indication territory of the RLC SDU correspondence of setting threshold;
First processing module, the first Length Indication information that is used for surpassing the RLC SDU of setting threshold places at least two indication territories in one group of corresponding indication territory, whole length of described first Length Indication information indication RLCSDU.
The embodiment of the invention determines that length surpasses one group of indication territory of the RLC SDU correspondence of setting threshold from the expansion of the protocol Data Unit RLC pdu header of wireless chain control layer; To place at least two indication territories in one group of corresponding indication territory above the first Length Indication information of the RLC SDU of setting threshold, whole length of described first Length Indication information indication RLC SDU.Because the length that can indicate the RLC SDU of overlength among the RLC PDU, when a plurality of overlength RLC SDU is arranged, can avoid the congested of upper layer data bag, and then avoid loss of data, thereby improve system transmissions efficient, further improved user experience.
Description of drawings
Figure 1A is the protocol stack structure schematic diagram of LTE system;
Figure 1B is a RLC AMD PDU structural representation;
Fig. 2 is the apparatus structure schematic diagram of embodiment of the invention indication RLC SDU length;
Fig. 3 A is first kind of RLC AMD of embodiment of the invention PDU structural representation;
Fig. 3 B is second kind of RLC AMD of embodiment of the invention PDU structural representation;
Fig. 3 C is the third RLC AMD PDU structural representation of the embodiment of the invention;
Fig. 3 D is the 4th kind of RLC AMD PDU of an embodiment of the invention structural representation;
Fig. 3 E is the 5th kind of RLC AMD PDU of an embodiment of the invention structural representation;
Fig. 3 F is the 6th kind of RLC AMD PDU of an embodiment of the invention structural representation one;
Fig. 3 G is the 6th kind of RLC AMD PDU of an embodiment of the invention structural representation two;
Fig. 3 H is the 6th kind of RLC AMD PDU of an embodiment of the invention structural representation three;
Fig. 4 is the method flow schematic diagram of embodiment of the invention indication RLC SDU length.
Embodiment
The embodiment of the invention is from the expansion of RLC pdu header, determine that length surpasses one group of protocol Data Unit RLC SDU correspondence indication territory of the wireless chain control layer of setting threshold, and will place at least two indication territories in one group of corresponding indication territory, whole length of first Length Indication information indication RLC SDU above the first Length Indication information of the RLC SDU of setting threshold.Because the length that can indicate the RLC SDU of overlength among the RLC PDU, when a plurality of overlength RLC SDU is arranged, can avoid the congested of upper layer data bag, and then avoid loss of data, thereby improve system transmissions efficient.
Wherein, the embodiment of the invention can be applied to the situation that last RLC SDU among the RLC PDU does not need to use the indication of LI territory, also can be applied to the situation that last RLC SDU among the RLC PDU need use the indication of LI territory.The indicating mode of every kind of situation is all identical, no longer distinguishes in the following description.
Below in conjunction with Figure of description the embodiment of the invention is described in further detail.
As shown in Figure 2, the device of embodiment of the invention indication RLC SDU length comprises: first determination module 10 and first processing module 20.
Wherein, comprise at least two indication territories in one group of indication territory.
In specific implementation process, setting threshold stipulates in the agreement that at present the length of a LI territory indication is 2047 bytes, so can set the threshold to 2047 as required.Certainly, also can set the threshold to other numerical value.
Surpass with length below that in one group of indication territory of RLC SDU correspondence of setting threshold two indication territories to be arranged be that example describes, indicate the mode in territories similar with two, repeat no more greater than the mode in two indication territories.
Wherein, two indication territories in a group can be two LI territories, or a LI territory and an I territory.
Because RLC PDU length surpasses setting threshold, so comprise high-order information and low level information in the first Length Indication information.
Suppose that preset threshold is 2047 bytes, then low level information begins counting, waits to surpass 2047, and high-order information adds 1, and low level information continues counting since 0 then.Such as RLC PDU length is 6263 bytes, then low level information begins counting, after 2047, high-order information adds 1, and low level information continues to count since 0 then, again after 2047, high-order information adds 1 again, low level information continues counting since 0 then, and last high-order information is 3 (promptly 00000000011), and low level information is 122 (promptly 00001111010).
If two indication territories in a group are two LI territories, then the high-order information in the first Length Indication information is placed in one of them LI territory, and the low level information in the first Length Indication information is placed in another LI territory;
Specifically be that high-order information is placed in the LI territory that high-order information or back are placed in the LI territory of front in a group, can set as required, but need to guarantee among the RLC PDU, placing high-order sequence of information in one group of indication territory of each length above the RLC SDU correspondence of setting threshold is consistent, if high-order information is placed in the LI territory of front in promptly determining one group, then other groups all are the fronts high-order information is placed in the LI territory.
If two indication territories in a group are a LI territory and an I territory, then the high-order information in the first Length Indication information is placed in the I territory, and LI places in the territory low level information in the first Length Indication information, and the I territory takies at least 1 bit.
Because 2047 bytes can only be indicated at most in regulation LI territory in the agreement at present, RLC SDU is the highest 8188 bytes, so if preset threshold is 2047, then high-order information has only 3 at most.
If the LI territory byte number of indication at most enlarges, and the also corresponding expansion of threshold value, then high-order information might only need 1 bit.That is to say, specifically need what bits to set as required.
In specific implementation process, except the RLC SDU of overlength, also may there be the RLC SDU of non-overlength among RLC PDU.
The device of the embodiment of the invention can further include: second determination module 30 and second processing module 40.
Wherein, comprise at least one indication territory in one group of indication territory.
Surpass with length below that one or two indication territory is that example describes in one group of indication territory of RLC SDU correspondence of setting threshold, indicate the mode in territories similar with two, repeat no more greater than the mode in two indication territories.
Wherein, one group of indication territory can be two LI territories, or a LI territory and an I territory; One group of indication territory can be a LI territory.
Because RLC PDU length does not surpass setting threshold, so the second Length Indication information is low level information.
It is a variety of to place the mode in one group of corresponding indication territory to have the second Length Indication information, illustrates below:
If one group of indication territory that mode one is determined is two LI territories, invalid information is placed in one of them LI territory, and the second Length Indication information is placed in another LI territory;
If one group of indication territory that mode two is determined is a LI territory and an I territory, wherein invalid information is placed in the I territory, and LI places in the territory the second Length Indication information;
If one group of indication territory that mode three is determined is a LI territory, then the second Length Indication information is placed in this LI territory;
If the length that mode four is determined does not surpass the Different L I territory in the corresponding respectively same group of indication territory of two adjacent RLC SDU of setting threshold, wherein the second Length Indication information of corresponding RLC SDU is placed in each LI territory.
In specific implementation process, invalid information can be a string hash, and such as 00000000000, can also predesignate some information is invalid information.
Wherein, which kind of mode the RLC PDU of non-overlength specifically adopts to set as required; Preferable, the RLC SDU of non-overlength preferably adopts with a kind of indicating mode in a RLC PDU.
In specific implementation process, there is various ways in the RLC SDU of non-overlength:
The RLC SDU of form one, discontinuous non-overlength;
Form two, continuously and quantity be the RLC SDU of the non-overlength of even number;
Form three, continuously and quantity be the RLC SDU of the non-overlength of odd number.
Above-mentioned four kinds of modes, form one～three all is suitable for.
If employing mode one (or mode two) can be wasted a plurality of LI territory (or a plurality of I territory), such as have 10 continuously and quantity be the RLC PDU of the non-overlength of even number, then need to waste 10 LI territories (or 10 I territories).
If employing mode three (or mode four) is compared mode one and mode two and can be reduced the waste in indication territory.
Wherein, if also comprise two E territories in one group of indication territory, then whether there is one group of indication territory behind this group indication territory of one of them E domain representation; When not having one group of indication territory behind this group indication territory of this E domain representation, another E domain representation should be organized the quantity in LI territory in the indication territory; When after this E domain representation should be organized the indication territory, having one group of indication territory, place the first Length Indication information in two LI territories of another this group of E domain representation or place two second Length Indication information.
Wherein, if also comprise two E territories in one group of indication territory, then whether there is one group of indication territory behind this group indication territory of one of them E domain representation; Another E domain representation should be placed two LI territories in the group indication territory, or placed a LI territory and an I territory.
Need to prove that the device of the embodiment of the invention can be any entity of protocols having stack architecture, such as LE (terminal), eNB (evolution base station).
Be that example describes with RLC AMD PDU below.
As shown in Figure 3A, in first kind of RLC AMD of embodiment of the invention PDU structural representation, odd number LI territory is arranged altogether.Remove last group indication territory, other group indication territories comprise two E territories (i.e. an E territory and an E3 territory) and two LI territories; Last group indication territory comprises two E territories and a LI territory, in the end adds 4 padding bits (can think a kind of I territory) behind a LI territory.
According to the structure of Fig. 3 A, this schematic diagram is applicable to that last group indication territory needs the RLC SDU of corresponding non-overlength.
The RLC SDU of overlength adopts two LI territory indications; Remove last group indication territory, the RLC SDU of two non-overlength of two LI territory correspondences in other group indication territories, or the RLC SDU of two corresponding non-overlength in LI territory; The RLC SDU of a non-overlength of last group indication territory indication.
The implication in the E territory of standing part is referring to table 1 in the RLC PDU head:
| Value | Describe |
| ??0 | Behind RLC PDU head standing part, follow the Data territory |
| ??1 | Behind RLC PDU head standing part, follow one group of E, the combination in E3 and LI territory |
The implication in the E territory of expansion is referring to table 2 in table 1E territory implication (the E territory of standing part in the RLC PDU head) the RLC PDU head:
Table 2E territory implication (the E territory of expansion in the RLC PDU head)
When the E territory of expansion in the RLC PDU head was 0, the E3 implication was referring to showing 3A:
| Value | Describe |
| ??0 | A corresponding LI territory behind this E territory (being in one group of indication territory at E3 place a LI territory to be arranged) |
| ??1 | Corresponding two LI territories behind this E territory (being in one group of indication territory at E3 place two LI territories to be arranged) |
Table 3A
When the E territory of expansion in the RLC PDU head was 1, the E3 implication was referring to showing 3B:
Table 3B
Wherein, for the indication of two LI territories be the situation of a RLC SDU, comprise the data segment (being high-order information) of several 2047 bytes among LI territory indication (overlength) RLC SDU; Another LI territory indication (overlength) RLC last data length of SDU (being low level information) less than 2047 byte data sections.
Such as after receiving a RLC PDU as shown in Figure 3A, when reading first expansion of RLC PDU head,, will meet one group of E, E3, the set in LI territory after showing two LI territories of behind this E territory, following so if the E territory equals 1.
If the E3 territory equals 1, that show two corresponding behind this E3 territory LI territory indications so is a RLC SDU, comprises the data segment of several 2047 bytes among the previous LI territory indication RLC SDU; The data length (is unit with the byte) of last discontented 2047 byte data section of the LI territory indication in back SDU.
If first LI thresholding is 00000000011, show the RLCSDU that this RLC SDU is an overlength so, comprise the data segment of 3 2047 bytes; If second LI thresholding is 00001111010, show so the data segment of the integer of indicating in comprising first LI territory among this overlength SDU 2047 bytes also to comprise 122 bytes, then the length of overlength RLC SDU is 3 * 2047+122=6263 byte.
Shown in Fig. 3 B, in second kind of RLC AMD of embodiment of the invention PDU structural representation, the difference of second kind of RLC AMD PDU structure and first kind of RLC AMD PDU structure is:
Second kind of RLC AMD PDU structure one total even number LI territory, every group like this (comprising last group) indication territory all comprises two E territories (i.e. an E territory and an E3 territory) and two LI territories.
Than first kind of RLC AMD PDU structure, any situation all is suitable for like this.
Concrete indicating mode in second kind of RLC AMD PDU structure and the implication in each territory and first kind of RLC AMD PDU structure similar repeats no more.
Shown in Fig. 3 C, in the third RLC AMD PDU structural representation of the embodiment of the invention, the difference of the third RLC AMD PDU structure and first kind of RLC AMD PDU structure is:
Remove last group indication territory, putting in order of each territory is in other every group of indication territory: E territory, LI territory, E3 territory, LI territory.
Last putting in order of territory of group indication is: E territory, LI territory, E3 territory.Wherein the E3 territory takies in 4 padding bits of last correspondence one.
Because two LI territories in a group do not link to each other, so identification together after when reading, two LI territories need being read together or read respectively.
Concrete indicating mode in the third RLC AMD PDU structure is similar with the implication in each territory and first kind of RLC AMD PDU structure, repeats no more.
Shown in Fig. 3 D, in the 4th kind of RLC AMD PDU of the embodiment of the invention structural representation, the difference of the 4th kind of RLCAMD PDU structure and the third RLCAMD PDU structure is:
The 4th kind of RLC AMD PDU structure one total even number LI territory, every group like this (comprising last group) indication territory all comprises two E territories (i.e. an E territory and an E3 territory) and two LI territories.
Than the third RLC AMD PDU structure, any situation all is suitable for like this.
Concrete indicating mode in the 4th kind of RLC AMD PDU structure and the implication in each territory and the third RLC AMD PDU structure similar repeats no more.
Shown in Fig. 3 E, in the 5th kind of RLC AMD PDU of the embodiment of the invention structural representation, adopt the current RLC AMD PDU structure that contains even number LI territory.
Every group of indication territory all comprises two E territories and two LI territories.
Wherein, it is meaningful only to set one of them E territory in every group of indication territory, and another E territory is nonsensical.
Such as stipulating in agreement that first E territory is meaningful in every group of indication territory, second E territory is nonsensical.When reading, only read significant E territory in every group of indication territory like this.
The RLC SDU of overlength and the RLC SDU of non-overlength adopt two LI territory indications.
The implication in the E territory of standing part is referring to table 4 in the RLC PDU head:
| Value | Describe |
| ??0 | Behind RLC PDU head standing part, follow the Data territory |
| ??1 | Behind RLC PDU head standing part, follow the combination in one group of E and (two) LI territory |
The implication in the E territory of expansion is referring to table 5 in table 4E territory implication (the E territory of standing part in the RLC PDU head) the RLC PDU head:
| Value | Describe |
| ??0 | Behind (two) LI territory of this E territory correspondence, follow the Data territory |
| ??1 | Behind (two) LI territory of this E territory correspondence, follow the combination in one group of E and (two) LI territory |
Table 5E territory implication (the E territory of expansion in the RLC PDU head)
In two LI territories such as a RLC SDU correspondence, what indicated in previous LI territory is the low level information of RLC SDU length, and what indicated in a back LI territory is the high-order information of RLC SDU length.When the need indicating length was the RLC SDU of 6263 bytes, the value in previous LI territory was 00001111010, and the value in a back LI territory is 00000000011.
In the 6th kind of RLC AMD PDU of the embodiment of the invention structural representation, two kinds of indication domain structures are arranged, wherein a kind of indication domain structure comprises two E territories (i.e. an E territory and an E3 territory) and two LI territories shown in Fig. 3 F; Another kind of indication domain structure comprises two E territories (i.e. an E territory and an E3 territory) a LI territory and an I territory shown in Fig. 3 G, wherein the I territory takies 3 bits.
Comprise that the RLC SDU of two non-overlength is indicated in two LI territories respectively in one group of indication territory in two E territories (i.e. an E territory and an E3 territory) and two LI territories;
Comprise in one group of indication territory in two E territories (i.e. an E territory and an E3 territory), a LI territory and an I territory LI territory and the RLC SDU of an overlength of an I territory indication or the RLC SDU of a non-overlength.
The implication in the E territory of standing part is referring to table 6 in the RLC PDU head:
| Value | Describe |
| ??0 | Behind RLC PDU head standing part, follow the Data territory |
| ??1 | Behind RLC PDU head standing part, follow one group of indication territory |
The implication in the E territory of expansion is referring to table 7 in table 6E territory implication (the E territory of standing part in the RLC PDU head) the RLC PDU head:
| Value | Describe |
| ??0 | Behind one group of indication territory at this place, E territory, follow the Data territory |
| ??1 | Then another group is indicated territory behind one group of indication territory at this place, E territory |
The implication in table 7E territory implication (the E territory of expansion in the RLC PDU head) E3 territory is referring to table 8:
| Value | Describe |
| ??0 | Latter half is the I territory in one group of indication territory |
| ??1 | Latter half is the LI territory in one group of indication territory |
The implication in table 8E3 territory
The implication in I territory is referring to table 9:
| Value | Describe |
| ??000 | Be padding |
| ??001-011 | High-order information for overlength SDU |
| ??100-111 | Reserve |
The implication in table 9I territory
Such as receiving the RLC AMD PDU shown in Fig. 3 H, suppose that first group of E territory in the indication territory is 1, LI1 is 00001111010, and the E3 territory is 0, and the I territory is 011.Second group is indicated the E territory in the territory is 0, and LI2 is 00001111010, and the E3 territory is 1, and LI3 is 00001111011.
Then the RLC SDU length of first group of indication territory indication overlength is the RLCSDU of the overlength of 6263 bytes, and the RLC SDU length of two non-overlength of second group of indication territory indication is respectively 122 bytes and 123 bytes.
Need to prove, six kinds of top structures just illustrate, can be combined into multiple RLC PDU structure according to the indicating mode of the overlength RLC SDU that provides in the invention process and the indicating mode of non-overlength RLC SDU, in a RLC PDU, the RLCSDU that two LI territory indication overlength promptly can be arranged can have a LI territory and an I territory to indicate the RLC SDU of overlength again; The indicating mode of corresponding non-overlength also can have multiple in a RLC PDU, and these combinations and variation pattern are not just enumerated one by one at this.
As shown in Figure 4, the method for embodiment of the invention indication RLC SDU length comprises the following steps:
Wherein, comprise at least two indication territories in one group of indication territory.
In specific implementation process, setting threshold stipulates in the agreement that at present the length of a LI territory indication is 2047 bytes, so can set the threshold to 2047 as required.Certainly, also can set the threshold to other numerical value.
Can be in the step 401 according to the position of RLC SDU in the data field of RLC PDU, and the indication position of territory in the expansion of RLC pdu header, determine that length surpasses the indication territory of the RLCSDU correspondence of setting threshold.RLC SDU (being the RLC SDU that length surpasses setting threshold) such as an overlength of two indication territory indications, if the RLC SDU of overlength is first in data field, then preceding two indication territories become one group of indication territory in the expansion, are used to indicate the RLC SDU of first overlength, and the like.
Surpass with length below that in one group of indication territory of RLC SDU correspondence of setting threshold two indication territories to be arranged be that example describes, indicate the mode in territories similar with two, repeat no more greater than the mode in two indication territories.
Wherein, two indication territories in a group can be two LI territories, or a LI territory and an I territory.
Because RLC PDU length surpasses setting threshold, so comprise high-order information and low level information in the first Length Indication information.
Suppose that preset threshold is 2047 bytes, then low level information begins counting, waits to surpass 2047, and high-order information adds 1, and status information continues counting since 0 then.Such as RLC PDU length is 6263 bytes, then low level information begins counting, after 2047, high-order information adds 1, and low level information continues to count since 0 then, again after 2047, high-order information adds 1 again, low level information continues counting since 0 then, and last high-order information is 3 (promptly 00000000011), and low level information is 122 (promptly 00001111010).
If two indication territories in a group are two LI territories, then the high-order information in the first Length Indication information is placed in one of them LI territory, and the low level information in the first Length Indication information is placed in another LI territory;
Specifically be that high-order information is placed in the LI territory that high-order information or back are placed in the LI territory of front in a group, can set as required, but need to guarantee among the RLC PDU, placing high-order sequence of information in one group of indication territory of each length above the RLC SDU correspondence of setting threshold is consistent, if high-order information is placed in the LI territory of front in promptly determining one group, then other groups all are the fronts high-order information is placed in the LI territory.
If two indication territories in a group are a LI territory and an I territory, then the high-order information in the first Length Indication information is placed in the I territory, and LI places in the territory low level information in the first Length Indication information, and the I territory takies at least 1 bit.
Because 2047 bytes can only be indicated at most in regulation LI territory in the agreement at present, RLC SDU is the highest 8188 bytes, so if preset threshold is 2047, then high-order information has only 3 at most.
If the LI territory byte number of indication at most enlarges, and the also corresponding expansion of threshold value, then high-order information might only need 1 bit.That is to say, specifically need what bits to set as required
In specific implementation process, except the RLC SDU of overlength, also may there be the RLC SDU of non-overlength among RLC PDU.
The method of the indication RLC SDU length of the embodiment of the invention can further include:
Step 403, from the expansion of RLC pdu header, determine that length surpasses one group of indication territory of the RLC SDU correspondence of setting threshold.
Wherein, comprise at least one indication territory in one group of indication territory.
Determine that the mode in one group of indication territory is similar in the mode in the definite one group of indication territory of step 403 and the step 401, also be according to the position of RLC SDU in the data field of RLC PDU, and indicate the position of territory in the expansion in RLCPDU packet header, determine the indication territory of the RLC SDU correspondence of the non-overlength of length.
Surpass with length below that one or two indication territory is that example describes in one group of indication territory of RLC SDU correspondence of setting threshold, indicate the mode in territories similar with two, repeat no more greater than the mode in two indication territories.
Wherein, two indication territories in a group can be two LI territories, or a LI territory and an I territory; One group of indication territory is a LI territory.
Because RLC SDU length does not surpass setting threshold, so the second Length Indication information is low level information.
It is a variety of to place the mode in one group of corresponding indication territory to have the second Length Indication information, illustrates below:
If one group of indication territory that mode one is determined is two LI territories, invalid information is placed in one of them LI territory, and the second Length Indication information is placed in another LI territory;
If one group of indication territory that mode two is determined is a LI territory and an I territory, wherein invalid information is placed in the I territory, and LI places in the territory two Length Indication information;
If one group of indication territory that mode three is determined is a LI territory, then the second Length Indication information is placed in this LI territory;
If the length that mode four is determined does not surpass the Different L I territory in the corresponding respectively same group of indication territory of two adjacent RLC SDU of setting threshold, wherein the second Length Indication information of corresponding RLC SDU is placed in each LI territory.
In specific implementation process, invalid information can be a string hash, and such as 00000000000, can also predesignate some information is invalid information.
Wherein, which kind of mode the RLC SDU of non-overlength specifically adopts to set as required; Preferable, the RLC SDU of non-overlength preferably adopts with a kind of indicating mode in a RLC SDU.
In specific implementation process, there is various ways in the PLC SDU of non-overlength:
The RLC SDU of form one, discontinuous non-overlength;
Form two, continuously and quantity be the RLC SDU of the non-overlength of even number;
Form three, continuously and quantity be the RLC SDU of the non-overlength of odd number.
Above-mentioned four kinds of modes, form one～three all is suitable for.
If employing mode one (or mode two) can be wasted a plurality of LI territory (or a plurality of I territory), such as have 10 continuously and quantity be the RLC SDU of the non-overlength of even number, then need to waste 10 LI territories (or 10 I territories).
If employing mode three (or mode four) is compared mode one and mode two and can be reduced the waste in indication territory.
Wherein, if also comprise two E territories in one group of indication territory, then whether there is one group of indication territory behind this group indication territory of one of them E domain representation; When not having one group of indication territory behind this group indication territory of this E domain representation, another E domain representation should be organized the quantity in LI territory in the indication territory; When after this E domain representation should be organized the indication territory, having one group of indication territory, place the first Length Indication information in two LI territories of another this group of E domain representation or place two second Length Indication information.
Wherein, if also comprise two E territories in one group of indication territory, then whether there is one group of indication territory behind this group indication territory of one of them E domain representation; Another E domain representation should be placed two LI territories in the group indication territory, or placed a LI territory and an I territory.
In specific implementation process, can first execution in step 401, execution in step 403 again; Also can first execution in step 403, execution in step 401 again; Can also while execution in step 401 and step 403.
Also have a kind of mode is to carry out which step according to the selective sequential of the RLC SDU in the data field, promptly indicate successively according to the order of the RLC SDU in the data field, such as the current RLC SDU that need indicate is the RLC SDU of overlength, then execution in step 401, if the current RLC SDU that need indicate is the RLC SDU of non-overlength, then execution in step 403.
Need to prove that the method executive agent of the embodiment of the invention can be any entity of protocols having stack architecture, such as UE, eNB.
From the foregoing description as can be seen: the embodiment of the invention determines that length surpasses one group of RLC SDU correspondence indication territory of setting threshold from the expansion of the protocol Data Unit RLC pdu header of wireless chain control layer; To place at least two indication territories in one group of corresponding indication territory above the first Length Indication information of the RLC SDU of setting threshold, whole length of described first Length Indication information indication RLC SDU.Because the length that can indicate the RLC SDU of overlength among the RLC PDU, when a plurality of overlength RLCSDU is arranged, can avoid the congested of upper layer data bag, and then avoid loss of data, thereby improve system transmissions efficient, further improved user experience.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. method of indicating the Service Data Unit RLC SDU length of wireless chain control layer is characterized in that this method comprises:
From the expansion of the protocol Data Unit RLC pdu header of wireless chain control layer, determine that length surpasses one group of indication territory of the RLC SDU correspondence of setting threshold;
To place at least two indication territories in one group of corresponding indication territory above the first Length Indication information of the RLC SDU of setting threshold, whole length of described first Length Indication information indication RLC SDU.
2. the method for claim 1 is characterized in that, described length comprises two indication territories in one group of indication territory above the RLC SDU correspondence of setting threshold;
Described two indication territories are two LI territories, and the high-order information in the first Length Indication information is placed in one of them LI territory, and the low level information in the first Length Indication information is placed in another LI territory; Perhaps described two indication territories are a LI territory and an I territory, and wherein the high-order information in the first Length Indication information is placed in the I territory, and LI places in the territory low level information in the first Length Indication information.
3. method as claimed in claim 1 or 2 is characterized in that, determines that the indication territory that length surpasses the RLC SDU correspondence of setting threshold comprises:
According to the position of RLC SDU in the data field of RLC PDU, and the indication position of territory in the expansion of RLC pdu header, determine that length surpasses the indication territory of the RLC SDU correspondence of setting threshold.
4. method as claimed in claim 2 is characterized in that, this method also comprises:
From the expansion of RLC pdu header, determine that length does not surpass one group of indication territory of the RLC SDU correspondence of setting threshold, comprises at least one indication territory in described one group of indication territory;
The second Length Indication information that will not surpass the RLC SDU of setting threshold places one group of corresponding indication territory.
5. method as claimed in claim 4 is characterized in that, the described second Length Indication information that will not surpass the RLC SDU of setting threshold places one group of corresponding indication territory to comprise:
If one group of indication territory determining is two LI territories, invalid information is placed in one of them LI territory, and the second Length Indication information is placed in another LI territory;
If one group of indication territory determining is a LI territory and an I territory, wherein invalid information is placed in the I territory, and LI places in the territory two Length Indication information;
If one group of indication territory determining is a LI territory, then the second Length Indication information is placed in this LI territory;
If the length of determining does not surpass the Different L I territory in the corresponding respectively same group of indication territory of two adjacent RLC SDU of setting threshold, wherein the second Length Indication information of corresponding RLC SDU is placed in each LI territory.
6. method as claimed in claim 5 is characterized in that, if also comprise two E territories in one group of indication territory, then whether has one group of indication territory behind this group indication territory of one of them E domain representation;
When not having one group of indication territory behind this group indication territory of described E domain representation, another E domain representation should be organized the quantity in LI territory in the indication territory;
When there is one group of indication territory in described E domain representation after should group indication territory, the placement first Length Indication information or place two second Length Indication information in two LI territories of another E domain representation this group.
7. method as claimed in claim 5 is characterized in that, if also comprise two E territories in one group of indication territory, then whether has one group of indication territory behind this group indication territory of one of them E domain representation;
One group of indication of another E domain representation is placed two LI territories in the territory, or places a LI territory and an I territory.
8. device of indicating the Service Data Unit RLC SDU length of wireless chain control layer is characterized in that this device comprises:
First determination module is used for from the expansion of the protocol Data Unit RLC pdu header of wireless chain control layer, determines that length surpasses one group of indication territory of the RLC SDU correspondence of setting threshold;
First processing module, the first Length Indication information that is used for surpassing the RLC SDU of setting threshold places at least two indication territories in one group of corresponding indication territory, whole length of described first Length Indication information indication RLCSDU.
9. device as claimed in claim 8 is characterized in that, described length comprises two indication territories in one group of indication territory above the RLC SDU correspondence of setting threshold;
Described two indication territories are two LI territories, and the high-order information in the first Length Indication information is placed in one of them LI territory, and the low level information in the first Length Indication information is placed in another LI territory; Perhaps described two indication territories are a LI territory and an I territory, and wherein the high-order information in the first Length Indication information is placed in the I territory, and LI places in the territory low level information in the first Length Indication information.
10. install as claimed in claim 8 or 9, it is characterized in that described first determination module is used for:
According to the position of RLC SDU in the data field of RLC PDU, and the indication position of territory in the expansion of RLC pdu header, determine that length surpasses the indication territory of the RLC SDU correspondence of setting threshold.
11. device as claimed in claim 9 is characterized in that, this device also comprises:
Second determination module is used for from the expansion of RLC pdu header, determines that length does not surpass one group of indication territory of the RLC SDU correspondence of setting threshold, comprises at least one indication territory in described one group of indication territory;
Second processing module, the second Length Indication information that is used for not surpassing the RLC SDU of setting threshold places one group of corresponding indication territory.
12. device as claimed in claim 11 is characterized in that, described second processing module is used for:
If one group of indication territory determining is two LI territories, invalid information is placed in one of them LI territory, and the second Length Indication information is placed in another LI territory;
If one group of indication territory determining is a LI territory and an I territory, wherein invalid information is placed in the I territory, and LI places in the territory two Length Indication information;
If one group of indication territory determining is a LI territory, then the second Length Indication information is placed in this LI territory;
If the length of determining does not surpass the Different L I territory in the corresponding respectively same group of indication territory of two adjacent RLC SDU of setting threshold, wherein the second Length Indication information of corresponding RLC SDU is placed in each LI territory.
13. device as claimed in claim 12 is characterized in that, if also comprise two E territories in one group of indication territory, then whether has one group of indication territory behind this group indication territory of one of them E domain representation;
When not having one group of indication territory behind this group indication territory of described E domain representation, another E domain representation should be organized the quantity in LI territory in the indication territory;
When there is one group of indication territory in described E domain representation after should group indication territory, the placement first Length Indication information or place two second Length Indication information in two LI territories of another E domain representation this group.
14. device as claimed in claim 12 is characterized in that, if also comprise two E territories in one group of indication territory, then whether has one group of indication territory behind this group indication territory of one of them E domain representation;
One group of indication of another E domain representation is placed two LI territories in the territory, or places a LI territory and an I territory.
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