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CN103428246A - Method and terminal for retransmitting uplink IP package through packet data convergence protocol layer - Google Patents

Method and terminal for retransmitting uplink IP package through packet data convergence protocol layer Download PDF

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Publication number
CN103428246A
CN103428246A CN2012101591739A CN201210159173A CN103428246A CN 103428246 A CN103428246 A CN 103428246A CN 2012101591739 A CN2012101591739 A CN 2012101591739A CN 201210159173 A CN201210159173 A CN 201210159173A CN 103428246 A CN103428246 A CN 103428246A
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bag
retransmitted
packet header
pdcp
overcompression
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CN2012101591739A
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CN103428246B (en
Inventor
杨辉
崔强军
刘钰
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ZTE Corp
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ZTE Corp
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Abstract

A method and terminal for retransmitting an uplink IP package through a packet data convergence protocol layer. The method is applied to a terminal side. The method comprises the steps that when the fact that the uplink IP package to be retransmitted is not compressed or encrypted is judged, the uplink IP package is retransmitted, a PDCP packet header, stored in local, of the IP package is removed, and an original IP package is restored and then is retransmitted. Different methods are adopted in different fields of view, usage frequency of memory space is can be effectively reduced, and especially under the situation of non-compression and non-encryption, the IP package can be directly retransmitted without additionally applying for memory space storing the original IP package. In addition, compared with the prior art, the method has the advantages that the effect of variety processing is achieved, and the efficiency of processing is improved by changing the manner of copying the IP package in one way into carrying out the process in a selective mode.

Description

Method and terminal that packet data convergence protocol is retransmitted up IP bag
Technical field
The present invention relates to the communications field, be specifically related to method and terminal that a kind of PDCP (Packet Data Convergence Protocol, referred to as PDCP) layer is retransmitted up IP bag.
Background technology
At wireless access network field E-UTRAN (evolved Universal Terrestrial Radio Access Network, the general continental rise wireless access network of evolution) 36323 in the regulation, the PDCP layer is for the treatment of the radio resource management messages on control plane and the Internet Protocol bag on user plane.The support that PDCP reorders and retransmits while comprising header-compressed, security functions and switching.The header-compressed of PDCP mainly adopts robust header compression agreement (Robust Header Compression, referred to as ROHC) to carry out.When the reconstruction that the PDCP layer can be initiated at chain of command and switching, support IP (Internet Protocol, Internet protocol) bag to retransmit.
When moving to the coverage of another community, the coverage of UE Cong Yige community can switch.Switching type can be divided into harmless switching and seamless switching.Harmless switching refers to: under AM (confirmation) pattern, require the Data Control face of transmission in the situation that certain can initiation rebuild, under the reconstruction state, PDCP initiates the re-transmission of IP bag.Cause that the situation that chain of command initiates to rebuild can be divided into following four kinds:
(1) RRC (Radio Resource Control, Radio Resource is controlled) reprovision failure;
(2) Radio Link Failure;
(3) integrity protection failure;
(4) handoff failure.
As can be seen here, PDCP IP bag retransmits and played very important effect in LTE (Long Term Evolution, Long Term Evolution).
At present during the retransmit issue of PDCP process IP bag, the main means that adopt are that the IP bag is once copied and copies, and retain original IP bag, and the initial IP packet that directly calls copy is good when initiating to retransmit is like this retransmitted.But this method can take memory space, cause the increase of internal memory.
Summary of the invention
The method and the terminal that the object of the present invention is to provide a kind of PDCP layer to be retransmitted up IP bag, need copy when overcoming in prior art retransmission data packet may and copy the defect that takies too much internal memory that the IP bag is brought.
For addressing the above problem, the invention provides the method that a kind of PDCP (PDCP) layer is retransmitted up IP bag, be applied in end side, comprising:
If judge up IP bag to be retransmitted without overcompression and encryption,, when described up IP bag is retransmitted, remove the PDCP packet header that the local described up IP preserved wraps, restore initial IP packet, then retransmit described initial IP packet.
Further, described method also comprises:
For processing through overcompression not through the up IP bag of encryption, described terminal, when described up IP bag is transmitted first, before carrying out squeeze operation, copies the packet header of described up IP bag, as the original packet header of described IP bag;
When the described up IP bag of processing through overcompression is retransmitted, remove PDCP head and IP packet header in the up IP bag of this that preserve in this locality, after adding described original packet header, retransmit described up IP bag.
Further, described method also comprises:
Process without overcompression through encryption if judge up IP bag to be retransmitted, the up IP bag described to be retransmitted of preserving is removed to the PDCP head and obtain without PDCP message;
Be decrypted processing to described without PDCP message, obtain initial IP packet;
Retransmit described initial IP packet.
Further, described method also comprises:
For the up IP bag through overcompression and encryption, described terminal, in the process that described up IP bag is transmitted first, copies the original packet header of the packet header of described up IP bag as described up IP bag;
When described IP bag is retransmitted, after removing the PDCP head of the local described IP bag of preserving, be decrypted processing, then remove IP packet header, add described original packet header, obtain initial IP packet;
Retransmit described initial IP packet.
Correspondingly, the present invention also provides a kind of terminal, comprising:
Judge module, for judging that whether up IP bag to be retransmitted be through overcompression and encryption;
Processing module, at described judge module, judge the described up IP bag wait retransmitting without overcompression and encryption after, remove the PDCP packet header that the local described up IP preserved wraps, restore initial IP packet;
Sending module, for retransmitting the IP bag obtained after described processing module is processed.
Further, described terminal also comprises:
Pretreatment module, for for processing through overcompression not through the up IP bag of encryption, when transmitting first, before carrying out squeeze operation, copy the packet header of described up IP bag, as the original packet header of described IP bag;
Described processing module also, for when the described up IP bag of processing through overcompression is retransmitted, is removed PDCP head and IP packet header in the up IP bag of this that preserve in this locality, adds described original packet header.
Further,
Processing module also, for judging at described judge module when the up IP bag retransmitted is processed without overcompression through encryption, is removed the PDCP head by the up IP bag described to be retransmitted of preserving and is obtained without PDCP message; Also, for to described, without PDCP message, being decrypted processing, obtain initial IP packet.
Further, described method also comprises:
Pretreatment module, for the up IP bag for through overcompression and encryption, in the process that described up IP bag is transmitted first, copy the original packet header of the packet header of described up IP bag as described up IP bag;
Described processing module also, for when the described up IP bag through overcompression and encryption is retransmitted, after removing the PDCP head of the local described IP bag of preserving, is decrypted processing, then removes IP packet header, adds described original packet header, obtains initial IP packet.
The once copy that prior art is unified the IP bag copies, until arrive the maximum upper limit that the IP bag is preserved, has taken so very large space and internal memory.The present invention adopts processing methods different under different scenes, can effectively reduce the use of memory headroom, especially, in the non-encrypted situation of non-compression, directly can additionally not apply for that space internal memory preservation initial IP packet just completes the retransmission processes of IP bag.In addition, compared with prior art, the present invention wraps optionally and processes from monistic copy IP, has reached the effect of diverse processing, has improved the efficiency of processing.
The accompanying drawing explanation
Fig. 1 is system physical connection schematic diagram in the embodiment of the present invention;
Fig. 2 is the protocol layer architecture schematic diagram of related network elements in system in the embodiment of the present invention;
Fig. 3 is the method flow diagram that in the embodiment of the present invention, the PDCP layer is retransmitted up IP bag;
Fig. 4 is the structural representation of terminal in the embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that do not conflict, the embodiment in the application and the feature in embodiment be combination in any mutually.
As shown in Figure 1, system comprises UE (User Equipment, subscriber equipment) and base station (eNB).Wherein, comprise CC (Call Control calls out and controls) plate, BPL (BaseBand Processor Tpye L, LTE Baseband Processing Unit L-type) plate, RF (Radio Frequency, radio frequency) plate and power supply, fan etc. on UE.As shown in Figure 2, the protocol layer that user's face comprises comprises from top to bottom: PDCP, RLC (Radio Link Control, wireless chain control layer), MAC (Media Access Control, media access control layer) and PHY (physical layer).Mutual signaling information is arranged between the same protocol layer of UE and eNB.In the UE side, upstream data is the transmission of direction from top to bottom along protocol layer; And, in the eNB side, upstream data is the transmission of direction from top to bottom along protocol layer.
According to existing protocol regulation, UE holds when carrying out transmitting uplink data, need be along protocol layer after order from top to bottom processed, send to base station side by the PHY layer.After due to rlc layer, up IP bag being processed, can be preserved the IP bag that does not normally send to base station.Therefore the IP data after preserving according to rlc layer can restore the IP data of the required re-transmission of PDCP layer.
The PDCP layer comprises head compression (Header Compression) and these two functions of cryptographic algorithm (Ciphering), and accordingly, the PDCP layer can comprise following several situation to the processing of IP bag:
A) without compressing without the encryption situation
B) compression is arranged without the encryption situation
C) without being compressed with the encryption situation
D) be compressed with the encryption situation.
In the present embodiment, for above-mentioned 4 kinds of different dispositions, the method that the PDCP layer is retransmitted up IP bag comprises:
1) without compressing without the encryption situation
Because under this kind of disposition, the IP bag is not through overcompression and encryption, therefore large change does not occur in the IP bag, just on initial IP packet, added the head of PDCP, therefore, as shown in Figure 3, UE can remove the PDCP packet header that local this IP preserved wraps, restore initial IP packet, then initiate the re-transmission of this initial IP packet.
Save most in this case space, the time used is also minimum.
2) compression is arranged without the encryption situation
Owing to compressing the packet header that just changes initial IP packet, and the content of IP bag is not changed, so, when transmitting this IP bag first, the packet header that can copy this IP bag before carrying out squeeze operation, as the original packet header of this IP bag;
When this IP bag is retransmitted, after removing PDCP head and IP packet header in this IP bag of preserving in this locality, after adding above-mentioned original packet header, this IP bag is sent.
Due to like this need not be whole IP packet replication copy once, thereby have greatly reduced the use of internal memory.
3) without being compressed with the encryption situation
In such cases, adopt the method that the first deciphering reduction of IP bag of preservation is encrypted again to be processed.Comprise:
A) the IP bag to be retransmitted of this locality being preserved removes the PDCP head, obtains without PDCP message;
B) this is decrypted to processing without PDCP message, obtains initial IP packet;
C) retransmit this initial IP packet.
Although this method has increased the processing time, with original copy replicating original IP bag, compare the use of effectively having avoided memory headroom.
4) be compressed with the encryption situation
In such cases, first copy and copy the IP head, the IP bag before the method for reducing by deciphering obtains encrypting, then, by copying original IP head, can restore initial IP packet, so just can initiate the re-transmission of IP bag.Specifically comprise:
A), in the process that the IP bag is transmitted first, copy copies the original packet header of the packet header of this IP bag as this IP bag;
B) when this IP bag occurs to retransmit, remove the PDCP head of local this IP bag to be retransmitted of preserving, obtain without PDCP message;
C) this is decrypted to processing without PDCP message, the IP bag before obtaining encrypting;
D) the IP bag before encrypting is removed to IP packet header and obtain the core message;
E) this core message is added to the local initial IP head of preserving has just restored initial IP packet;
F) retransmit this initial IP packet.
In a word, as shown in table 1, in the situation that, without compressing without encrypting, use said method, with the IP that removes the PDCP head, wrap and retransmitted, both reduced taking but also few holding time of space internal memory.For other sight, if more wide in range to the use of internal memory, and to time requirement in harsher situation, IP bag retransmit issue just could adopt original copy IP to wrap to wait for and the method for re-transmission so only take the time once copied.If the use to internal memory is harsher, and when more wide in range to the requirement of time, just can use above-mentioned processing method under relevant sight, although increased some processing times, greatly save to copy and copied IP and wrap shared internal memory.
Result of use analysis signal table under each scene of table 1
Figure BDA00001663191800071
A kind of terminal as shown in Figure 4, comprising:
Judge module, for judging that whether up IP bag to be retransmitted be through overcompression and encryption;
Processing module, at described judge module, judge the described up IP bag wait retransmitting without overcompression and encryption after, remove the PDCP packet header that the local described up IP preserved wraps, restore initial IP packet;
Sending module, for retransmitting the IP bag obtained after described processing module is processed.
Preferably, described terminal also comprises:
Pretreatment module, for for processing through overcompression not through the up IP bag of encryption, when transmitting first, before carrying out squeeze operation, copy the packet header of described up IP bag, as the original packet header of described IP bag;
Described processing module also, for when the described up IP bag of processing through overcompression is retransmitted, is removed PDCP head and IP packet header in the up IP bag of this that preserve in this locality, adds described original packet header.
Preferably,
Processing module also, for judging at described judge module when the up IP bag retransmitted is processed without overcompression through encryption, is removed the PDCP head by the up IP bag described to be retransmitted of preserving and is obtained without PDCP message; Also, for to described, without PDCP message, being decrypted processing, obtain initial IP packet.
Preferably, described method also comprises:
Pretreatment module, for the up IP bag for through overcompression and encryption, in the process that described up IP bag is transmitted first, copy the original packet header of the packet header of described up IP bag as described up IP bag;
Described processing module also, for when the described up IP bag through overcompression and encryption is retransmitted, after removing the PDCP head of the local described IP bag of preserving, is decrypted processing, then removes IP packet header, adds described original packet header, obtains initial IP packet.
One of ordinary skill in the art will appreciate that all or part of step in said method can come the instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.According to summary of the invention of the present invention; also other various embodiments can be arranged; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.

Claims (8)

1. the method that a PDCP (PDCP) layer is retransmitted up IP bag, be applied in end side, comprising:
If judge up IP bag to be retransmitted without overcompression and encryption,, when described up IP bag is retransmitted, remove the PDCP packet header that the local described up IP preserved wraps, restore initial IP packet, then retransmit described initial IP packet.
2. the method for claim 1, is characterized in that, also comprises:
For processing through overcompression not through the up IP bag of encryption, described terminal, when described up IP bag is transmitted first, before carrying out squeeze operation, copies the packet header of described up IP bag, as the original packet header of described IP bag;
When the described up IP bag of processing through overcompression is retransmitted, remove PDCP head and IP packet header in the up IP bag of this that preserve in this locality, after adding described original packet header, retransmit described up IP bag.
3. the method for claim 1, is characterized in that, also comprises:
Process without overcompression through encryption if judge up IP bag to be retransmitted, the up IP bag described to be retransmitted of preserving is removed to the PDCP head and obtain without PDCP message;
Be decrypted processing to described without PDCP message, obtain initial IP packet;
Retransmit described initial IP packet.
4. the method for claim 1, is characterized in that, also comprises:
For the up IP bag through overcompression and encryption, described terminal, in the process that described up IP bag is transmitted first, copies the original packet header of the packet header of described up IP bag as described up IP bag;
When described IP bag is retransmitted, after removing the PDCP head of the local described IP bag of preserving, be decrypted processing, then remove IP packet header, add described original packet header, obtain initial IP packet;
Retransmit described initial IP packet.
5. a terminal comprises:
Judge module, for judging that whether up IP bag to be retransmitted be through overcompression and encryption;
Processing module, at described judge module, judge the described up IP bag wait retransmitting without overcompression and encryption after, remove the PDCP packet header that the local described up IP preserved wraps, restore initial IP packet;
Sending module, for retransmitting the IP bag obtained after described processing module is processed.
6. terminal as claimed in claim 5, is characterized in that, also comprises:
Pretreatment module, for for processing through overcompression not through the up IP bag of encryption, when transmitting first, before carrying out squeeze operation, copy the packet header of described up IP bag, as the original packet header of described IP bag;
Described processing module also, for when the described up IP bag of processing through overcompression is retransmitted, is removed PDCP head and IP packet header in the up IP bag of this that preserve in this locality, adds described original packet header.
7. the terminal of stating as claim 5 is characterized in that:
Processing module also, for judging at described judge module when the up IP bag retransmitted is processed without overcompression through encryption, is removed the PDCP head by the up IP bag described to be retransmitted of preserving and is obtained without PDCP message; Also, for to described, without PDCP message, being decrypted processing, obtain initial IP packet.
8. terminal as claimed in claim 5, is characterized in that, also comprises:
Pretreatment module, for the up IP bag for through overcompression and encryption, in the process that described up IP bag is transmitted first, copy the original packet header of the packet header of described up IP bag as described up IP bag;
Described processing module also, for when the described up IP bag through overcompression and encryption is retransmitted, after removing the PDCP head of the local described IP bag of preserving, is decrypted processing, then removes IP packet header, adds described original packet header, obtains initial IP packet.
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CN103780342A (en) * 2014-01-13 2014-05-07 中国人民解放军理工大学 Satellite link quality adaptive header compression method based gain control
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CN111031574A (en) * 2017-03-23 2020-04-17 Oppo广东移动通信有限公司 Data transmission method, terminal equipment and network equipment
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CN110167067B (en) * 2018-02-13 2021-10-22 展讯通信(上海)有限公司 Data transmission method and device, storage medium, terminal and base station

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