CN101212404B - Robust header compressed group data transmission method and system - Google Patents
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Abstract
The invention discloses a transmitting method for a robust header compression grouped data and a system. The method comprises the following steps: whether the header of the received grouped data can be distinguish is judged; according to the result, the header of the grouped data carries out a robust compression process to obtain the processed header of the grouped data; the processed grouped data carrying a compression label is sent to the opposite end. The compression label is used for indicating whether the header of the grouped data carried out a compression process; the opposite end, according to the compression label, carries out a corresponding process for the received and processed grouped data. Through carrying out a compression label by the processed grouped data, whether the header of the grouped data is carried out a compression process is indicated, thus solving the requirement that the robust header is needed to carry out a compression process in the current technology, and furthermore solving the problem that the grouped data of the non-distinguished header has no way of transmitting. The realization of the transmission of the compression grouped data of the robust is further promoted.
Description
Technical field
The present invention relates to the 3G (Third Generation) Moblie technical field, be specifically related to the method and system of robust header compressed group data transmission.
Background technology
In the data handling procedure of third generation mobile system,, introduce grouped data packet header compression function: 1, Radio Resource finite sum costliness in view of following demand characteristics; 2, there is bigger information redundance in grouped data packet header; The header field value almost seldom changes; 3, for most packet, by sending static information and utilize contact between the continuous data header field value and head length degree that predictability can be reduced them greatly, thereby reduce volume of transmitted data, improve efficiency of transmission; 4, grouped data is less demanding to propagation delay time, and the holding time of compression and decompression expends and can tolerate.
The RFC3095 agreement is an agreement of compressing at grouped data packet header in internet engineering task group (IETF) the compression protocol family, and 3GPP Radio Resource control (RRC) agreement disposes RFC3095 since the 4th this support of stage plate.
Referring to Fig. 1, be configured for RRC at present and support that the principle steps of RFC3095 is generally as follows:
S1, according to traffic performance and terminal (UE) ability, in the RRC agreement, carry out the RFC3095 parameter configuration, and in PDCP (PDCP), carry out the RFC3095 function and realize;
S2, PDCP are according to the configuration parameter configuration compression end of RRC agreement and the data structure of decompressor end;
If S3 receives grouped data, described compression end and decompressor end adopt RFC3095 to handle packet header, its treatment step is as follows: following treatment step is an example with radio network controller (RNC), and the relevant processing of UE is identical with the principle of RNC, and just the direction of up-downgoing data is opposite:
S4, compression end are compressed processing to the packet header of downlink data;
Pass to the decompressor end of the PDCP agreement RFC3095 of UE after packet header after S5, the compression and the payload user data process PDCP protocol encapsulation by lower-layer protocols;
S6, decompressor end are carried out decompression to the packet header of the compression of upstream data, recover original packet header;
Packet header and payload user data after S7, the decompression pass to upper-layer protocol.
In the above step, RFC3095 identifies the data characteristic in packet header from header field, promptly determines the Context identifier (CID) of bag stream under these data, uses the RFC3095 algorithm and carries out the packet header compression;
As shown in Figure 2, in the step 6,7, can not identify the data of packet header CID for RFC3095 from header field, RFC3095 can't compress and handle and according to the frame format transmission of compressed package; If it as the bag transparent transmission that does not compress, because the RRC agreement is not configured to " appearance " with the PDCP head, therefore can't be transmitted this packet to the opposite end and be the packet header feature of compressed data packets not, thereby the consequence that causes such data to transmit.On the other hand, for PDCP agreement and RFC3095 agreement, all do not allow to abandon this type of packet.Therefore, the processing of this type of packet is in and does not but have means by transparent transmission, attempt the dilemma that packet loss does not meet agreement again.Existing principle scheme instructs in reality and has the problem that can not correctly realize when realizing.
Summary of the invention
The object of the present invention is to provide a kind of method and system of robust header compressed group data transmission, when solution can't be discerned grouped data packet header, to the normal transmission problem of grouped data.
For solving the problems of the technologies described above, the invention provides a kind of robust header compressed group data transmission method, comprise the steps:
Can judgement identify the packet header of the grouped data that receives;
According to judged result, robust header compressed processing is carried out in the packet header of grouped data, the grouped data after obtaining handling;
Grouped data after the described processing is carried compressing mark send to the opposite end, whether described compressing mark is used to indicate has carried out the compression processing to the packet header of described grouped data;
Handle the grouped data after the described processing that receives accordingly according to described compressing mark described opposite end.
Described compressing mark places the PDCP head.
The step that can described judgement identify the packet header of the grouped data that receives comprises the steps:
Judge whether and to identify data characteristic from packet header, be i.e. Context identifier.
Described according to judged result, the packet header of grouped data to be handled, the step of the grouped data after obtaining handling comprises the steps:
If can identify the packet header of described grouped data, then described packet header is carried out robust header compressed, the grouped data after obtaining handling; If can not identify described packet header, then be the grouped data after handling with the original packet data.
Described opposite end is according to described compressing mark, and the step that the grouped data after the described processing that receives is handled accordingly comprises the steps:
If the compressing mark indication is compressed the packet header of described grouped data, then behind the opposite end decompression packet header, the grouped data of reducing is sent to high level; Otherwise the grouped data after the processing that the opposite end directly will receive sends to high level.
A kind of block data transmission system comprises packet header recognition device, block data processing device and compressing mark recognition device, wherein,
Described packet header recognition device is used to discern the packet header of the grouped data that receives, and notifies described block data processing device with recognition result;
Described block data processing device is according to recognition result, robust header compressed processing is carried out in packet header to grouped data, grouped data after obtaining handling, and the grouped data after the described processing is carried compressing mark send to described compressing mark recognition device, whether described compressing mark is used to indicate has carried out compression to the packet header of described grouped data and has handled;
Described compressing mark recognition device is handled the grouped data after the described processing that receives accordingly according to described compressing mark.
Described block data processing device comprises controller, compressor reducer and concentrator marker, wherein,
Described controller receives the recognition result from described packet header recognition device, and transmits control signal to described compressor reducer;
Described compressor reducer carries out robust header compressed to the packet header of the grouped data that receives according to the control signal of coming self-controller, and the compression that will obtain the grouped data in packet header send to described concentrator marker as the grouped data after handling; Perhaps directly grouped data is sent to described concentrator marker as the grouped data after handling;
Described concentrator marker sends to described compressing mark recognition device after carrying compressing mark on the grouped data after the described processing.
Described compressing mark recognition device comprises identifier, decompressor and transmitter, wherein,
Whether described identifier receives the grouped data after the described processing of carrying compressing mark, and compress according to the packet header of the described grouped data of described compressing mark indication, transmits control signal to described decompressor;
After described decompressor carries out the decompression in packet header according to the control signal of the identifier grouped data after to described processing, the grouped data of reduction is sent to transmitter; Perhaps directly the data that receive are sent to transmitter;
Described transmitter will send to high level from the data of described decompressor.
Compared with prior art, the present invention has the following advantages:
By the grouped data after handling is carried compressing mark, indicate whether the packet header of grouped data is compressed, solved and required to realize robust header compressed processing in the prior art, but the problem that can't transmit for the grouped data that can't discern packet header, the transmission of further perfect robust header compressed group data realizes.
Description of drawings
Fig. 1 is the schematic flow sheet that RRC is configured the method for supporting RFC3095 in the prior art;
Fig. 2 is that RRC is configured the schematic flow sheet that the data processing quagmire appears in the method for supporting RFC3095 in the prior art;
Fig. 3 is the schematic flow sheet of robust header compressed group data transmission method embodiment one of the present invention;
Fig. 4 is the schematic flow sheet of robust header compressed group data transmission method embodiment two of the present invention;
Fig. 5 is a kind of structural representation of the packet of PDCP among the robust header compressed group data transmission method embodiment two of the present invention;
Fig. 6 is the another kind of structural representation of the packet of PDCP among the robust header compressed group data transmission method embodiment two of the present invention;
Fig. 7 is the schematic flow sheet of robust header compressed group data transmission method embodiment four of the present invention;
Fig. 8 is the structural representation of robust header compressed group data transmission system embodiment one of the present invention;
Fig. 9 is the structural representation of robust header compressed group data transmission system embodiment two of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Embodiment one, and referring to Fig. 3, a kind of robust header compressed group data transmission method comprises the steps:
Can S1, judgement identify the packet header of the grouped data that receives;
S2, according to judged result, the packet header of grouped data is handled the grouped data after obtaining handling;
S3, the grouped data after the described processing is carried compressing mark send to the opposite end, whether described compressing mark is used to indicate has carried out compression to the packet header of described grouped data and has handled;
Handle the grouped data after the described processing that receives accordingly according to described compressing mark S4, described opposite end.
Described compressing mark places the PDCP head.
The step that can described judgement identify the packet header of the grouped data that receives comprises the steps:
Judge whether and to identify data characteristic from packet header, be i.e. Context identifier (CID).
Described according to judged result, the packet header of grouped data to be handled, the step of the grouped data after obtaining handling comprises the steps:
If can identify the packet header of described grouped data, then described packet header is carried out robust header compressed, the grouped data after obtaining handling; If can not identify described packet header, then be the grouped data after handling with the original packet data.
Described opposite end is according to described compressing mark, and the step that the grouped data after the described processing that receives is handled accordingly comprises the steps:
If the compressing mark indication is compressed the packet header of described grouped data, then behind the opposite end decompression packet header, the grouped data of reducing is sent to high level; Otherwise the grouped data after the processing that the opposite end directly will receive sends to high level.
Embodiment two, the technical scheme of embodiment one is applied to RRC protocol configuration PDCP supports referring to Fig. 4, to comprise the steps: in the RFC3095 algorithm
T1, RRC protocol configuration PDCP support the RFC3095 algorithm, and the PDCP head is set is " appearance ";
T2, PDCP are according to the configuration parameter configuration RFC3095 compression end of RRC and the data structure of RFC3095 decompressor end;
T3, RFC3095 compression end are received grouped data, and described grouped data comprises packet header and payload user data, and the RFC3095 compression end judges whether and can identify data characteristic from packet header, i.e. the packet of Context identifier (CID), and generation PDCP;
If T4 RFC3095 compression end can identify CID from packet header, to use the RFC3095 algorithm and carry out the packet header compression, the packet of described PDCP comprises packet header and the payload user data after PDCP head, the compression; If RFC 3095 compression end can not identify CID from packet header, the value of the PID field in the PDCP head is made as " 0 ", be used to indicate the packet header of this grouped data not handle through overcompression, the packet of described PDCP comprises PDCP head and grouped data;
Described PID field is to be used to indicate the packet data package head to adopt the parameter of which kind of compression algorithm type and/or bag type in the RRC agreement;
The data packet delivery of T5, PDCP is given the robust header compressed agreement decompressor end of opposite end;
The RFC3095 decompressor end of T6, opposite end reads the value of the PID field in the packet of PDCP, if the PID field is " 0 ", then grouped data is sent to high level; If the PID field in the PDCP head is not " 0 ", then use the decompression in the packet header after the RFC3095 algorithm compresses, reduction obtains packet header, and packet header and payload user data are sent to high level.
Described RFC3095 compression end places RNC, and the RFC3095 decompressor end of described opposite end places UE, and described grouped data is a downlink data.
Described RFC3095 compression end places UE, and the RFC3095 decompressor end of described opposite end places RNC, and described grouped data is a upstream data.
Referring to Fig. 5,6, described PDCP head also comprises data cell type (PDU Type), and described PDU Type is used to indicate the form of the packet of described PDCP.
The packet of described PDCP comprises that also (Sequence Number, SN), described SN is used to indicate the order of the packet of described PDCP to sequence number.
For example, as shown in Figure 5, its PDU Type indicates the form of the packet of described PDCP to be: the PDCP head adds data (Data), and described Data comprises packet header and payload user data or the grouped data after the compression; As shown in Figure 6, its PDU Type indicates the form of the packet of described PDCP to be: PDCP head, sequence number add Data.
Adopt the technical scheme of the embodiment of the invention two, whether RRC protocol configuration PDCP head is occurred and dispose support between the RFC 3095 related, when having solved RRC protocol configuration PDCP and having supported RFC3095, the RFC3095 problem how correctly processing can't recognition data.
RFC3095 is as the IETF agreement, be embedded among the PDCP and realize, have certain independence, for the grouped data that in the RFC3095 processing procedure, can not discern, the description how RFC3095 itself does not handle, and the description how PDCP agreement itself is not also handled this situation.Among the PDC be 0 data that are described as not carrying out head compression to the PID value, it is 0 to identify the grouped data that RFC3095 can not discern processing that the technical program is utilized among the PDC PID value, by PDCP head this " bridge ", the processing of PDCP agreement and RFC3095 is closely linked, the grouped data that transparent transmission can not be discerned, solve the problem that to handle the data type that does not meet the RFC3095 agreement in PDCP when the RFC3095 agreement realizes, guaranteed RFC3095 correct and complete realization in the 3GPP framework.
Embodiment three, further, are applied to the RRC protocol configuration and support operability among the RFC3095 to increase following steps on the basis of embodiment two in order to improve the present invention:
RRC protocol configuration PDCP supports after the step of RFC3095 algorithm, and following steps also are set before the step of PDCP according to the data structure of the configuration parameter configuration RFC3095 compression end of RRC and RFC3095 decompressor end:
PDCP checks whether the PDCP head is configured to " appearance " in the configuration parameter of RRC agreement; If the PDCP head is configured to " appearance ", then continue subsequent operation; If the PDCP head is configured to " do not occur ", PDCP returns the message of configuration failure to RRC.
Adopt the technical scheme of the embodiment of the invention three, in the time of can detecting the RRC protocol configuration, the configuration error that the PDCP head whether occurs is avoided the situation that error configurations PDCP head is " not occurring " occurring, has improved operability and reliability that RRC protocol configuration of the present invention is supported the method for RFC3095.
Embodiment four, as shown in Figure 7, robust header compressed group data transmission method of the present invention is applied to the RRC protocol configuration supports to go among the RFC3095, comprise the steps:
P1: according to traffic performance and UE ability, the RRC agreement of RNC need dispose the PDCP agreement and support the RFC3095 algorithm; It is " appearance " that configuration supports the RFC3095 algorithm must dispose the PDCP head;
P2:PDCP checks the configuration parameter of RRC: when RFC3095 was supported in the RRC configuration, whether the PDCP head was configured to " appearance ";
P3: if the PDCP head is configured to " appearance ", PDCP is according to the configuration parameter configuration RFC3095 compression end of RRC and the data structure of decompressor end;
P4: if the PDCP head is configured to " do not occur ", PDCP returns configuration failure to RRC;
P5:PDCP receives grouped data, and differentiating uplink and downlink is handled;
P6:(is an example with the RNC side, for downlink data) RFC3095 compression end analysis packet header;
P7:(is an example with the RNC side, for downlink data) RFC3095 judges whether to identify from header field the data characteristic in packet header, i.e. CID;
P8:(is an example with the RNC side, for downlink data) if RFC3095 can wrap the CID that flows under header field identifies header data, use the RFC3095 algorithm and carry out the packet header compression;
P9:(is an example with the RNC side, for downlink data) RFC3095 can not be made as 0 value with the PID field in the PDCP header field from identify the data of packet header CID from header field; Indicating this data packet head is not handle through overcompression;
P10:(is an example with the RNC side, for downlink data) (compression or unpressed) packet header and payload user data pass to the PDCP of opposite end by lower-layer protocols;
P11:(is an example with the RNC side, for upstream data) PDCP reads the value of packet header PID field;
P12:(is an example with the RNC side, for upstream data) whether PID field in the PDCP head be " 0 "
P13:(is an example with the RNC side, for upstream data) if the PID field in the PDCP head is " 0 ", unpressed original packet header is directly recovered according to the PDCP frame format of Fig. 4 or Fig. 5;
P13:(is an example with the RNC side, for upstream data) if the PID field in the PDCP head is not " 0 ", uses the RFC3095 algorithm and carry out packet header and decompress, reduce original packet header;
P15:(is an example with the RNC side, for upstream data) original packet header and payload user data are passed to upper-layer protocol.
Embodiment one, and referring to Fig. 8, a kind of robust header compressed group data transmission system comprises packet header recognition device 11, block data processing device 12 and compressing mark recognition device 13, wherein,
Described packet header recognition device 11 is used to discern the packet header of the grouped data that receives, and notifies described block data processing device 12 with recognition result;
Described block data processing device 12 is according to recognition result, handle in packet header to grouped data, grouped data after obtaining handling, and the grouped data after the described processing is carried compressing mark send to described compressing mark recognition device 13, whether described compressing mark is used to indicate has carried out compression to the packet header of described grouped data and has handled;
Described compressing mark recognition device 13 is handled the grouped data after the described processing that receives accordingly according to described compressing mark.
Described block data processing device 12 comprises controller 121, compressor reducer 122 and concentrator marker 123, wherein, and the recognition result that described controller 121 receives from described packet header recognition device 11, and transmit control signal to described compressor reducer 122;
Described compressor reducer 122 compresses the packet header of the grouped data that receives according to the control signal of coming self-controller 121, and the compression that will obtain the grouped data in packet header send to described concentrator marker 123 as the grouped data after handling; Perhaps directly grouped data is sent to described concentrator marker 123 as the grouped data after handling;
Described concentrator marker 123 sends to described compressing mark recognition device 13 after carrying compressing mark on the grouped data after the described processing.
Described compressing mark recognition device 13 comprises identifier 131, decompressor 132 and transmitter 133, wherein,
Whether described identifier 131 receives the grouped data after the described processing of carrying compressing mark, and compress according to the packet header of the described grouped data of described compressing mark indication, transmits control signal to described decompressor 132;
After described decompressor 132 carries out the decompression in packet header according to the control signal of identifier 131 grouped data after to described processing, the grouped data of reduction is sent to transmitter 133; Perhaps directly the data that receive are sent to transmitter 133;
Described transmitter 133 will send to high level from the data of described decompressor 132.
Embodiment two, referring to Fig. 9, robust header compressed group data transmission system of the present invention is applied to the RRC protocol configuration to be supported among the RFC3095, comprise RRC protocol manager 1, PDCP manager 2, RFC3095 compression end 3 and RFC3095 decompressor end 4, its middle wrapping head recognition device 11 and block data processing device 12 place RFC3095 compression end 3, and compressing mark recognition device 13 places RFC3095 decompressor end 4.
Described RRC protocol manager 1 is used for disposing the parameter of described PDCP manager 2 according to traffic performance and UE ability, is used to support the RFC3095 algorithm, and the PDCP head is set for " appearance ";
Described PDCP manager 2 is used to dispose the data structure of RFC3095 compression end 3 and RFC3095 decompressor end 4;
Described RFC3095 compression end 3 is used for the grouped data that receives is handled, generate the packet of PDCP, and the packet of described PDCP sent to the described RFC3095 decompressor end 4 of opposite end, and described grouped data comprises packet header and payload user data, described processing is as follows:
Described RFC3095 compression end 3 judges whether and can identify data characteristic from packet header, be Context identifier (CID), if RFC3095 compression end 3 can identify CID from packet header, use the RFC3095 algorithm and carry out the packet header compression, the packet of described PDCP comprises packet header and the payload user data after PDCP head, the compression; If RFC3095 compression end 3 can not identify CID from packet header, the value of the PID field in the PDCP head is made as " 0 ", be used to indicate the packet header of this grouped data not handle through overcompression, the packet of described PDCP comprises PDCP head and grouped data;
Described RFC3095 decompressor end 4 reads the value of the PID field in the packet of PDCP, if the PID field is " 0 ", then grouped data is sent to high level; If the PID field in the PDCP head is not " 0 ", then use the decompression in the packet header after the RFC3095 algorithm compresses, reduction obtains packet header, and packet header and payload user data are sent to high level.
Described RFC3095 compression end 3 places RNC, and the RFC3095 decompressor end 4 of described opposite end places UE, and described grouped data is a downlink data.
Described RFC3095 compression end 3 places UE, and the RFC3095 decompressor end 4 of described opposite end places RNC, and described grouped data is a upstream data.
Described PDCP manager 2 comprises RFC3095 inking device 21, and described RFC3095 inking device 21 is used to dispose the data structure of RFC3095 compression end 3 and RFC3095 decompressor end 4; Also comprise calibration equipment 22, described calibration equipment 22 is used for checking the parameter of described RRC protocol manager 1 configuration, and whether the PDCP head is configured to " appearance "; If the PDCP head is configured to " appearance ", then RFC3095 inking device 21 continues subsequent operation; If the PDCP head is configured to " do not occur ", the message of " configuration failure " then returned to RRC protocol manager 1.
More than to the method and system of robust header compressed group data provided by the present invention transmission, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used 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 (6)
1. a robust header compressed group data transmission method is characterized in that, comprises the steps:
Can judgement identify the packet header of the grouped data that receives;
If can identify the packet header of described grouped data, then described packet header is carried out robust header compressed, the grouped data after obtaining handling; If can not identify described packet header, then with original packet data as the grouped data after handling;
Grouped data after the described processing is carried compressing mark send to the opposite end, whether described compressing mark is used to indicate has carried out the compression processing to the packet header of described grouped data;
Handle the grouped data after the described processing that receives accordingly according to described compressing mark described opposite end.
2. method according to claim 1 is characterized in that: described compressing mark places the PDCP head.
3. method according to claim 1 is characterized in that the step that can described judgement identify the packet header of the grouped data that receives comprises the steps:
Judge whether and to identify data characteristic from packet header, be i.e. Context identifier.
4. method according to claim 1 is characterized in that, described opposite end is according to described compressing mark, and the step that the grouped data after the described processing that receives is handled accordingly comprises the steps:
If the compressing mark indication has been carried out robust header compressed compression to the packet header of described grouped data, then behind the opposite end decompression packet header, the grouped data of reducing is sent to high level; Otherwise the grouped data after the processing that the opposite end directly will receive sends to high level.
5. block data transmission system is characterized in that: comprise packet header recognition device (11), block data processing device (12) and compressing mark recognition device (13), wherein,
Described packet header recognition device (11) is used to discern the packet header of the grouped data that receives, and notifies described block data processing device (12) with recognition result;
Described block data processing device (12) is according to recognition result, robust header compressed processing is carried out in packet header to grouped data, grouped data after obtaining handling, and the grouped data after the described processing is carried compressing mark send to described compressing mark recognition device (13), whether described compressing mark is used to indicate has carried out compression to the packet header of described grouped data and has handled;
Described compressing mark recognition device (13) is handled the grouped data after the described processing that receives accordingly according to described compressing mark;
Described block data processing device (12) comprises controller (121), compressor reducer (122) and concentrator marker (123), wherein,
Described controller (121) receives the recognition result from described packet header recognition device (11), and transmits control signal to described compressor reducer (122);
Described compressor reducer (122) carries out robust header compressed to the packet header of the grouped data that receives according to the control signal of coming self-controller (121), and the compression that will obtain the grouped data in packet header send to described concentrator marker (123) as the grouped data after handling; Perhaps directly grouped data is sent to described concentrator marker (123) as the grouped data after handling;
Described concentrator marker (123) sends to described compressing mark recognition device (13) after carrying compressing mark on the grouped data after the described processing.
6. system according to claim 5 is characterized in that: described compressing mark recognition device (13) comprises identifier (131), decompressor (132) and transmitter (133), wherein,
Whether described identifier (131) receives the grouped data after the described processing carry compressing mark, and compress according to the packet header of the described grouped data of described compressing mark indication, transmits control signal to described decompressor (132);
After described decompressor (132) carries out the decompression in packet header according to the control signal of identifier (131) grouped data after to described processing, the grouped data of reduction is sent to transmitter (133); Perhaps directly the data that receive are sent to transmitter (133);
Described transmitter (133) will send to high level from the data of described decompressor (132).
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