WO2012155566A1

WO2012155566A1 - Context reuse method and system

Info

Publication number: WO2012155566A1
Application number: PCT/CN2012/071365
Authority: WO
Inventors: 马德宝
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-08-26
Filing date: 2012-02-20
Publication date: 2012-11-22
Also published as: CN102300258A; CN102300258B

Abstract

The present invention provides a context reuse method, comprising: after selecting and reusing already used compression context for a currently received packet to be compressed, a compressor setting a current working mode of the compression context to an initial unidirectional mode, and sending an IR packet to a decompressor; the decompressor receiving the IR packet, searching for corresponding decompression context according to a context identifier in the IR packet, and setting a current working mode of the decompression context to the initial unidirectional mode. The present invention further provides a context reuse system. The application of the method and system to realize compression/decompression context work mode security migration improves the user experience.

Description

Context reuse method and system

The present invention relates to the field of wireless communication technologies, and in particular, to a method and system for context reuse. Background technique

Robust Header Compression Protocol (ROHC) is a general IP-based compression technology mainly used between base stations and user terminals.

A very important concept in ROHC in context, which is divided into compression context and decompression context. Each of the same service flows received by the compressor has a compression context for each packet to be compressed, where the compression context includes all relevant information of the packet to be compressed. Each compressed packet has a corresponding compression context in the compressor, and the decompressor also has a decompression context. In the ROHC packet processing, the to-be-compressed packet is generally divided into a static domain and a dynamic domain, where the static domain refers to a field with little or no change in the packet to be compressed; the dynamic domain refers to a field that changes frequently in the packet to be compressed. In general, the fields of the static domain of the packet to be compressed of the same traffic flow remain unchanged.

During the interaction between the compressor and the decompressor, the compressor needs to send packets to the decompressor. The packets include multiple types, such as IR packets and dynamic domain packets. The IR packet includes the following contents: a context identifier CID, a static header field of the packet to be compressed, and dynamic domain information. The dynamic domain IR packet contains the following contents: The context identifier CID, the packet to be compressed, the header dynamic domain information, and so on, but does not contain the static header information of the packet header of the packet to be compressed. When the context is established or the context is reinitialized, the message used is an IR message.

The modes of compressing/decompressing the context include a one-way mode, a bidirectional optimization mode, and a bidirectional reliable mode. When the compressor and the decompressor are initialized, the corresponding compression/decompression context mode is a one-way mode. Subsequent migration of the model can be achieved, such as moving to bidirectional optimization mode or to bidirectional reliable mode. Migration. The migration of the mode must be initiated by the decompressor.

In the prior art, the compression/decompression context reuse of the same service flow, when the compression context is reused, the compressor cannot notify the decompressor compression context to be reused, and the decompressor still retains the memory information in the original compression context storage space, and Continue to use the original working mode. In order for the compressor to operate in the same mode as the decompressor, the original operating mode needs to be used in the context of reuse compression.

The above compression/decompression context reuse process has the following problems: If the working mode of the compressor and the decompressor is not the initial one-way mode at this time, it is easy to cause an unsafe working mode switching, affecting the compression/decompression effect, and then affecting User experience. Summary of the invention

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method for context reuse that implements a secure mode of compression/decompression context mode.

The present invention proposes a method for context reuse, including:

After selecting and reusing a used compression context for the currently received packet to be compressed, the compressor sets the current working mode of the compression context to an initial one-way mode, and sends an IR message to the decompressor;

The decompressor receives the IR packet, searches for a corresponding decompression context according to the context identifier in the IR packet, and sets a current working mode of the decompression context to an initial one-way mode.

Preferably, the precondition for selecting and reusing a used compression context for the currently received packet to be compressed is:

There is no compression context for other packets to be compressed that is the same as the static domain of the packet to be compressed, and there is not enough storage space to create a compression context for the packet to be compressed.

Preferably, after the sending the IR message to the decompressor, the method further includes:

After confirming that the decompressor receives and parses the successful IR message, and after receiving the to-be-compressed packet, the compressor determines whether there is another same to be compressed as the currently received static domain to be compressed. The compression context of the package;

If the compression context exists, a message containing dynamic domain information but no static domain information is sent to the decompressor.

Preferably, the selecting and reusing a used compression context for the received packet to be compressed is specifically:

The compressor selects a storage space from the used compressed context storage space, clears the selected storage space, and uses the selected storage space to create a compression context for the package to be compressed.

The invention further provides a context reuse system, comprising:

a compressor, configured to: after selecting and reusing a used compression context for the received packet to be compressed, setting a current working mode of the compression context to an initial unidirectional mode, and transmitting a message to the decompressor IR; using a decompressor And receiving the IR packet, searching for a corresponding decompression context according to the context identifier in the IR packet, and setting a current working mode of the decompression context to an initial one-way mode.

Preferably, the compressor is further configured to: after confirming that the decompressor receives and parses the successful IR message, and when receiving the to-be-compressed packet, determining whether there is the same static domain as the currently received packet to be compressed. The compression context of the other received packets to be compressed; determining that the compressed context is present, sending a message containing dynamic domain information but no static domain information to the decompressor.

Preferably, the compressor is further configured to select a storage space from the used compression context storage space, clear the selected storage space, and create a compressed context of the to-be-compressed package by using the selected storage space.

After reusing the compression context, the present invention sets the current working mode of the compression context to the initial unidirectional mode, and sends an IR message to the decompressor, and the decompressor searches for the corresponding message according to the IR packet. The decompression context, the current working mode of the decompression context is set to the initial one-way mode, so that the working mode security migration of the compression/decompression context can be realized, and the user experience is improved. DRAWINGS

1 is a flow chart of an embodiment of a method for context reuse of the present invention;

2 is a block diagram showing an embodiment of a system for context reuse of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further described in conjunction with the embodiments herein. detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1, an embodiment of a method for context reuse according to the present invention includes: Step S101: After a compressor selects and reuses an used compression context for a currently received packet to be compressed, the current work of the compression context is performed. The mode is set to the initial unidirectional mode, and an IR message is sent to the decompressor;

Step S102: The decompressor receives the IR packet, searches for a corresponding decompression context according to the context identifier CID in the IR packet, and sets a current working mode of the decompression context to an initial one-way mode.

In this embodiment, after compressing the compression context for the currently received packet to be compressed, the compressor sets the reused compression to the initial unidirectional mode, and notifies the decompressor through the IR message, and the decompressor finds the corresponding decompression context, and The decompression context is set to the initial one-way mode, which ensures that the compressor and the decompressor work in the same mode, laying the foundation for the decompressor to initiate the decompression context mode migration, realizing the safe mode of the compression/decompression context, and improving the user's Experience the effect. The working modes of the above compression context and decompression context include an initial one-way mode, a bidirectional optimization mode, and a bidirectional reliable mode. Among them, the migration of the working mode must be initiated by the decompressor. And generally migrate from low working mode to high working mode. To ensure the security of the working mode migration, the compression context corresponding to the compressor and the working mode of the corresponding decompression context in the decompressor should be consistent before the working mode migration. The order of the working modes is as follows: ie, the decompressor initial unidirectional mode <bidirectional optimization mode < bidirectional reliable mode. Therefore, the working mode security migration of the compression/decompression context can be implemented by this embodiment.

Further, in the method embodiment of the foregoing context reuse, the precondition for selecting and reusing the used compression context for the currently received packet to be compressed is: there is no other to-be-compressed packet that is the same as the static domain to be compressed. The context is compressed and there is not enough storage space to create a compression context for the to-be-compressed package.

In this embodiment, a service flow received by the compressor includes a plurality of to-be-compressed packets, and the plurality of to-be-compressed packets are continuously received by the compressor one by one. Among them, a to-be-compressed package consists of two parts: static domain and dynamic domain. The static domains in the packets to be compressed in the same service flow may be the same or different, but the dynamic domains of different packets to be compressed in the same service flow are different.

When the compressor receives the first packet to be compressed of a certain service flow, it needs to create a compression context for the to-be-compressed packet. In the subsequent process, when receiving the to-be-compressed packet of the same service flow, it is first determined whether to receive other to-be-compressed packets of the same service flow that are the same as the static domain of the current to-be-compressed packet. If yes, the compression context of the other to-be-compressed packet is adopted; if not, a new compression context needs to be created for the received packet to be compressed; if there is not enough storage space to create a compression context for the to-be-compressed packet, A compression context is selected and reused in the created compression context. The packet to be compressed corresponding to the reused compression context may be the same service flow as the currently received packet to be compressed, or may be different service flows.

Further, in the method embodiment of the foregoing context reuse, after the compressor sends the IR message to the decompressor, the method further includes the following processing: confirming that the decompressor receives and parses the successful IR report. After receiving the to-be-compressed packet, it is determined whether there is a compression context of other to-be-compressed packets that is the same as the currently received static domain to be compressed. When the compression context exists, the packet containing the dynamic domain information but not the static domain information is sent to the decompressor, that is, the packet is a packet including dynamic domain information other than the IR packet, such as a dynamic domain. IR message.

Further, for the decompressor, when the decompressor does not find a corresponding decompression context according to the CID in the IR packet, the received IR packet is an IR packet sent when the compression context is newly created, and the decompressor needs to create a new one. Uncompress the context. If the corresponding decompression context is found, the description is the IR message sent by the compressor when the compression context is reinitialized or when the context is reused. In short, the decompressor does not need to consider the message generated by the IR message. In the above three cases, the same processing is applied to the processing of IR messages.

In this embodiment, the IR packet includes a static domain and a dynamic domain content of the corresponding packet to be compressed. After confirming that the decompressor receives and parses the successful IR message, it indicates that the decompressor receives the static domain and dynamic domain related information of the packet to be compressed. When the static domain of the packet to be compressed is the same as the packet to be compressed corresponding to the IR packet, the compressor does not need to send the static domain related information of the packet to be compressed to the decompressor, and directly sends the current decompressor to the decompressor. Dynamic domain IR packet of the received dynamic domain related information of the packet to be compressed. In this manner, the load of the packet is effectively reduced, thereby improving the compression/decompression efficiency of the packet to be compressed.

Further, in the method embodiment of the foregoing context reuse, the selecting, and reusing, a used compression context for the received packet to be compressed is specifically: the compressor selects a storage space from the used compression context storage space, and clears the selected space. Storage space, and use the selected storage space to create a compression context for the package to be compressed.

The method of context reuse provided by the embodiment of the present invention can implement the safe migration of the compression/decompression context mode, and at the same time reduce the load of the message, thereby improving the compression/decompression efficiency of the packet to be compressed.

Referring to FIG. 2, a system 100 for context reuse is provided, including: a compressor 110 and decompression 120.

The compressor 110 is configured to: after selecting and reusing a used compression context for the received packet to be compressed, setting a current working mode of the compression context to an initial one-way mode, and sending an IR message to the decompressor 120;

The decompressor 120 is configured to receive the IR packet, find a corresponding decompression context according to the CID in the IR packet, and set a current working mode of the decompression context to an initial one-way mode.

In this embodiment, after compressing the compression context for the currently received packet to be compressed, the compressor 110 sets the reused compression to the initial unidirectional mode, and notifies the decompressor 120 through the IR message, and the decompressor 120 searches according to the IR message. The corresponding decompression context is set, and the decompression context is set to the initial one-way mode, thereby ensuring that the working modes of the compressor 110 and the decompressor 120 are the same, laying the foundation for the decompressor 120 to initiate the decompression context working mode migration, and implementing the compression/decompression context. The safe migration of work mode improves the user experience.

The working modes of the above compression context and decompression context include an initial one-way mode, a two-way optimization mode, and a two-way reliable mode. Among them, the migration of the working mode must be initiated by the decompressor 120. And generally migrate from low working mode to high working mode. To ensure the security of the working mode migration, the compression context corresponding to the compressor 110 and the corresponding decompression context in the decompressor 120 should be consistent before the working mode migration. The order of the above operating modes is as follows: that is, the decompressor 120 initial unidirectional mode <bidirectional optimization mode < bidirectional reliable mode. Therefore, the working mode security migration of the compression/decompression context can be achieved by this embodiment.

Further, in the embodiment 100 of the above-mentioned context reuse system, the precondition of the compressor 110 selecting and reusing a used compression context for the currently received packet to be compressed is: the same as the static domain of the to-be-compressed packet The compression context of other packets to be compressed, and there is not enough storage space to create a compression context for the to-be-compressed package.

In this embodiment, a service flow received by the compressor 110 includes a plurality of to-be-compressed packets, and the plurality of to-be-compressed packets are continuously received by the compressor 110 one by one. Among them, one to be compressed by The static domain and the dynamic domain are composed of two parts. The static domains in the packets to be compressed in the same service flow may be the same or different, but the dynamic domains of different packets to be compressed in the same service flow are different.

When the compressor 110 receives the first packet to be compressed of a certain service flow, it needs to create a compression context for the to-be-compressed packet. In the subsequent process, when receiving the to-be-compressed packet of the same service flow, it is first determined whether the other to-be-compressed packet of the same service flow that is the same as the static domain of the current to-be-compressed packet has been received. If yes, the compression context of the other to-be-compressed packet is adopted; if not, a new compression context needs to be created for the current to-be-compressed packet; if there is not enough storage space to create a compression context for the current to-be-compressed packet, A compression context is selected and reused in the created compression context. The to-be-compressed packet corresponding to the reused compression context may be the same service flow as the current to-be-compressed packet, or may be different service flows.

Further, in the embodiment 100 of the above-mentioned context reuse, the compressor 110 is further configured to: determine, after receiving the to-be-compressed packet, after confirming that the decompressor 120 receives and parses the IR packet successfully, determining whether there is a current reception a compression context of the other packets to be compressed whose packets are to be compressed in the static domain; when the compression context exists, the packet containing the dynamic domain information but no static domain information is sent to the decompressor 120, that is, the packet is Other than the IR message, the message contains the dynamic domain information, such as the dynamic domain IR message.

Further, for the decompressor 120, when the decompressor 120 does not find a corresponding decompression context according to the CID in the IR message, the received IR message is an IR message sent when the compression context is newly created, and the decompressor 120 is at this time. Need to create a new decompression context. If the corresponding decompression context is found, it is an IR message sent by the compressor 110 when the compression context is reinitialized or when the context is reused. In summary, the decompressor 120 does not need to consider the message generated by the IR message. In this embodiment, the IR packet includes static domain and dynamic domain related information of the corresponding packet to be compressed. After the compressor 110 confirms that the decompressor 120 receives and parses the successful IR message, it indicates that the decompressor 120 receives the static domain and dynamic domain related information of the packet to be compressed. When subsequently received The static domain to be compressed is the same as the static domain to be compressed corresponding to the IR packet, and the compressor 110 does not need to send the static domain related information of the to-be-compressed packet to the decompressor 120, and directly sends the information to the decompressor 120. Dynamic domain IR packet of the dynamic domain-related information of the packet to be compressed. Through the manner of this embodiment, the payload of the packet is effectively reduced, thereby improving the compression/decompression efficiency of the packet to be compressed.

Further, in the embodiment 100 of the context reuse system, the compressor 110 is configured to select a storage space from the used compression context storage space, clear the selected storage space, and create a to-be-compressed package by using the selected storage space. Compression context.

The context reuse system 100 provided in this embodiment can implement the safe mode migration of the compression/decompression context, and at the same time reduce the load of the message, thereby improving the compression/decompression efficiency of the packet to be compressed.

It should be understood that the above is only a preferred embodiment of the present invention, and thus the scope of the invention is not limited thereby, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are used directly or indirectly. Other related technical fields are equally included in the scope of patent protection of the present invention.

Claims

Claim

A method for context reuse, characterized in that the method comprises:

After selecting and reusing the used compression context for the currently received packet to be compressed, the compressor sets the current working mode of the compression context to an initial unidirectional mode, and sends an IR message to the decompressor; the decompressor receives the IR The packet searches for a corresponding decompression context according to the context identifier in the IR packet, and sets a current working mode of the decompression context to an initial one-way mode.

2. The method of context reuse according to claim 1, wherein the precondition for selecting and reusing the used compression context for the currently received packet to be compressed is:

There is no compression context of other packets to be compressed that are the same as the static domain of the packet to be compressed, and there is not enough storage space to create a compression context for the packet to be compressed.

The method of context reuse according to claim 1 or 2, wherein after the sending the IR packet to the decompressor, the method further includes:

After confirming that the demodulator receives and parses the successful IR message, and after receiving the to-be-compressed packet, the compressor determines whether there is a compression context of another to-be-compressed packet that is the same as the currently received static domain to be compressed.

The method of context reuse according to claim 3, wherein the selecting and compressing the used compression context for the received packet to be compressed is:

5. A context reuse system, the system comprising: a compressor and a decompressor;

a compressor, configured to: after selecting and reusing the used compression context for the received packet to be compressed, setting a current working mode of the compression context to an initial one-way mode, and sending an IR report to the decompressor Text

The decompressor is configured to receive the IR packet, find a corresponding decompression context according to the context identifier in the IR packet, and set a current working mode of the decompression context to an initial one-way mode.

6. The context reuse system of claim 5, wherein

The preconditions for selecting and reusing the used compression context for the currently received packet to be compressed are:

The context reuse system according to claim 5 or 6, wherein the compressor is further configured to: after confirming that the decompressor receives and parses the successful IR message, and receives the to-be-compressed packet And determining whether there is a compression context of another to-be-compressed packet that is the same as the static domain to be compressed currently received; determining that the compressed context is present, sending a packet containing dynamic domain information but no static domain information to the decompressor.

8. The context reuse system of claim 7, wherein:

The compressor is further configured to select a storage space from the used compressed context storage space, clear the selected storage space, and use the selected storage space to create a compression context of the to-be-compressed package.