WO2012171289A1

WO2012171289A1 - Method and apparatus for switching working mode of robust header compression protocol layer

Info

Publication number: WO2012171289A1
Application number: PCT/CN2011/080933
Authority: WO
Inventors: 董建军
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-13
Filing date: 2011-10-18
Publication date: 2012-12-20
Also published as: CN102215236B; CN102215236A

Abstract

Disclosed are a method and an apparatus for switching a working mode of a robust header compression protocol (ROHC) layer. The method comprises: when a working mode of an ROHC layer is required to be switched, determining, according to the working mode before and after the switching, whether context information conversion is required; and if yes, setting context information in a switched working mode according to the context information in the current working mode, and initiating working mode switching. According to the present invention, the problem of wastes of learning resources in the working mode switching of the ROHC layer is solved, and the utilization rate of the system resource can be improved.

Description

The present invention relates to the field of communications, and in particular to a method for switching a working mode of a Robust Header Compression Protocol (ROHC) layer and Device. Background technique

ROHC is short for Robust Header Compression Protocol. It is a general IP-based compression technology that can be applied to any standard of 3G (3rd Generation Partnership Project) and can also be applied to B3G. In LTE (Long Term Evolution) technology, it mainly works between a base station and a user terminal. ROHC mainly performs packet header compression on packet flows. Its functional entities are divided into compression end and decompression end. The compression end and the decompression end need to maintain a set of context information. When the compression end is sure that the decompression end maintains sufficient context information, it enters compression. Status, start sending compressed packets. Afterwards, the compression end and the decompression end selectively update the respective context information according to the current message, so as to ensure that the context information of the compression end and the decompression end are the same.

ROHC uses different compression algorithms for the change of each field value in the packet header. The List compression algorithm is specifically used to compress RTP (Real-time Transport Protocol) CSRC (Contribution Sourc, source, The RTP CSRC option consists of a series of elements called a list, the elements in the list are for each CSRC value, and the adjacent package is used to identify the split source. Between, the linked list is rarely changed, and if there is no change, the compressed end can not send any data. If a small change occurs, the compression side only needs to send the changed part between the linked lists to achieve the purpose of compression; the Table-based item compression algorithm is used to effectively compress a single element (item) ), its basic idea is: The compression side assigns a unique corresponding index (index) to each item, and the compression side saves the sent item and its index to a Table table (also called the relationship table between the element and the label). ), when the compression end is sure that the decompression end already knows the correspondence between index and item, the compression end only needs to send index instead of item to achieve the purpose of compression; similarly, the decompression end also maintains a Table, table The received item and the corresponding index are saved. When the decompressed end only receives the index, if there is no item, the corresponding item can be found according to the index to the Table, so that the decompression is correctly performed. The compression side introduces a label between each pair of items and index: Known (known bit). Known has two values 0 and 1. When Known is 0, it means that the compression end is not sure whether the decompressor knows the correspondence between the item and index. When Known is 1, it means that the compression end is sure that the decompression end has been decompressed. I know this pair of items and index Correspondence between them. Known is initially 0, when is set to 1 for Known, that is, when the compression end is sure that the decompression end has learned the correspondence, which is related to the specific working mode. In the prior art, ROHC supports three working modes: one-way working mode (SP, U mode), two-way optimized working mode (ie, 0 mode), and two-way reliable working mode (ie, R mode). When working in the R mode, the compressor and the decompressor context are mainly synchronized by the feedback information, and a Table table is maintained for each pair of index and item in the context information of the compression end, and the Table is as shown in Table 1, wherein, in the table, The SN stores the value of the SN of the packet that has been sent to carry the index and item relationship. When any SN in the table is confirmed by the feedback information, the Known is set to 1, and the SN field in the table is cleared. Table 1

In U/O mode, due to lack of feedback, the table maintained by the compression end is shown in Figure 2. The compression end needs to maintain a counter value in the table to indicate the count of the correspondence between the index and item sent. After the count value reaches a certain number of transmissions, the Known is set to 1. Table 2

A table is also maintained in the decompression side context. Each time the decompressor receives a pair of items and indexes, it is placed in the table, and the corresponding Known is set to 1. At the same time, in order to update the reference list in time and effectively, the compressed end context information maintains a List library, which stores all linked lists that may be used as a reference list. Since the correspondence between item and index has been maintained in the Table table, Therefore, the linked list in the List library only needs to save the index value. The selection of the reference list is different for the different working modes of the ROHC. For example, in the R mode, the unique identifier of the linked list in the List library is represented by the SN of the data packet, and all the SN values of the data packet sent by the list need to be maintained, and used to receive the feedback information, and the SN corresponding to the feedback information The linked list is selected as the reference linked list; in the U/0 mode, the unique identifier of the linked list in the List library is represented by the Gen_Id (chain list identifier) value, which is initially generated randomly, and if the list does not change, the value does not change. If the change occurs, the value is incremented by 1. The context information also needs to maintain the number of times the current list is sent. When the number of times of sending reaches the upper limit of the list, the linked list corresponding to the index in the Gen_Id value is selected as the reference list. The decompression side context also maintains a List library for selecting the reference list based on the list indication sent by the compression side. In the current technology, the decompression end can be based on the current channel environment, the bit error rate, the delay size, and the feedback signal. Whether the channel exists, the priority of the service, the size of the stream packet, etc., the mode conversion is initiated at any time, and in the process of switching between the U/0 mode and the R mode, the compressed end is cleared because the stored linked list context information is different. The Table table and the List library maintained in the context of the decompression end, after the mode switching succeeds, the Table table and the List library are re-maintained in the new mode. This mode switching method fails to inherit the previous learning experience, resulting in wasted learning resources, which in turn affects the compression efficiency of the linked list after mode switching. In view of the waste of learning resources in the ROHC working mode switching in the related art, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION The present invention provides a working mode switching method and apparatus for a robust header compression protocol layer to at least solve the problem of wasted learning resources in the working mode switching of the above ROHC. According to an aspect of the present invention, a method for switching an operating mode of an ROHC layer is provided, including: determining, when performing an operation mode switching of an ROHC layer, whether context information conversion is required according to a working mode before and after switching; if yes, according to The context information of the current working mode sets the context information of the working mode after the switching, and initiates the working mode switching. Preferably, determining whether the context information conversion is required according to the working mode before and after the switching comprises: if the current working mode is the one-way working mode or the bidirectional optimized working mode, and determining to perform the context information conversion when switching to the two-way reliable working mode; or If the current working mode is the bidirectional reliable working mode, if you want to switch to the one-way working mode or the bidirectional optimized working mode, it is determined that the context information conversion is required. Preferably, setting the context information of the switched working mode according to the context information of the current working mode comprises: setting context information in the second element and the label relationship table according to the context information in the first element and the label relationship table, where The element and label relationship table is an element and label relationship table learned in the current working mode, and the second element and label relationship table is an element and label relationship table corresponding to the switched working mode; according to the context information in the first link library Context information in the second link library, where the first link library is a link library learned in the current working mode, and the second link library is a link library corresponding to the switched working mode. Preferably, the current working mode is a one-way working mode or a two-way optimized working mode, and when the switched working mode is a two-way reliable working mode, setting a second element and a label relationship table according to the context information in the first element and the label relationship table. The context information in the method includes: searching for an element whose element sending count value reaches a first upper limit in the first element and tag relationship table, and setting a known bit corresponding to the found element in the second element and the tag relationship table as Determining an identifier; setting context information in the second link library according to context information in the first link library The method includes: searching, in the first link library, a link whose link transmission count value reaches a second upper limit, and setting the found link as a reference link in the second link library. Preferably, the current working mode is a bidirectional reliable working mode, and when the switched working mode is a one-way working mode or a bidirectional optimized working mode, the second element and the tag relationship table are set according to the context information in the first element and the label relationship table. The context information in the method includes: counting the number of the packet sequence number SN corresponding to each element in the label relationship table of the first element; using the number of statistics as the sending count value of the corresponding element in the second element and the label relationship table, And setting, in the second element and the label relationship table, a known bit corresponding to the element whose sending count value reaches the first upper limit is set as the determined identifier; and setting the second link library according to the context information in the first link library The context information in the method includes: counting the number of the data packet sequence number SN corresponding to each link in the first link library; using the number of statistics as the sending count value of the corresponding link in the second link library, and sending A link whose count value reaches the second upper limit is used as a reference link. Preferably, after the working mode switching is initiated, the method further includes: performing compression or decompression of the element according to the context information of the switched working mode. According to another aspect of the present invention, an operation mode switching apparatus of an ROHC layer is provided, including: an information conversion judging module, configured to determine whether a context needs to be performed according to an operation mode before and after switching, when an operation mode switching of the ROHC layer is required The information setting module is configured to: when the judgment result of the information conversion judging module is yes, set the context information of the switched working mode according to the context information of the current working mode; and the mode switching module is set to initiate the working mode switching. Preferably, the information conversion judging module includes: a first determining unit, configured to determine that a context information conversion is required when the current working mode is a one-way working mode or a bidirectional optimal working mode; or The second determining unit is set to determine that the context information conversion is required if the current working mode is the two-way reliable working mode and the mode is to be switched to the one-way working mode or the two-way optimized working mode. Preferably, the information setting module includes: a relationship table setting unit, configured to set context information in the second element and the label relationship table according to the context information in the first element and the label relationship table, where the first element and the label relationship table The element and label relationship table for learning in the current working mode, the second element and label relationship table is an element and label relationship table corresponding to the switched working mode; the link library setting unit is set according to the first link library The context information sets the context information in the second link library, where the first link library is a link library learned in the current working mode, and the second link library is a link library corresponding to the switched working mode. Preferably, the relationship table setting unit includes: an element search subunit, configured to set the current working mode to a one-way working mode or a two-way optimized working mode, and when the switched working mode is a two-way reliable working mode, the relationship between the first element and the label The element in the table that finds the element sending count value reaches the first upper limit; the first relation table setting a subunit, configured to set a known bit corresponding to an element found by the element search subunit in the second element and the tag relationship table as a determined identifier; the link library setting unit includes: a link lookup subunit, set to current The working mode is a one-way working mode or a two-way optimized working mode. When the working mode after the switching is the two-way reliable working mode, the first link library searches for a link whose link sending count value reaches a second upper limit; The link library setting subunit is configured to set the link found by the link lookup subunit as a reference link in the second link library. Preferably, the relationship table setting unit includes: an element statistics subunit, configured to set the current working mode to a bidirectional reliable working mode, and when the switched working mode is a one-way working mode or a bidirectional optimized working mode, the first element and the label relationship are counted. The number of the packet sequence number SN corresponding to each element in the table; the second relationship table setting subunit, set to count the number of statistics of the element statistics subunit as the sending count value of the corresponding element in the second element and the label relationship table And setting, in the second element and the label relationship table, a known bit corresponding to the element whose sending count value reaches the first upper limit is set as the determined identifier; the link library setting unit includes: a link statistics subunit, set to The current working mode is a two-way reliable working mode, and the number of data packet sequence numbers SN corresponding to each link in the first link library is counted when the working mode after the switching is the one-way working mode or the two-way optimized working mode; The link library setting subunit is set to send the number of the link statistics subunit statistics as the corresponding link in the second link library. The count value is used as a reference link for the link whose transmission count value reaches the second upper limit. According to the present invention, the element context information after the switching is set by using the element context information learned before the switching, so that the element context information before the switching does not need to be emptied again, and the learning resource is wasted in the ROHC working mode switching. , improve the utilization of system resources. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing an operation mode switching method of a ROHC layer according to Embodiment 1 of the present invention; FIG. 2 is a block diagram showing a configuration of an operation mode switching device of a ROHC layer according to Embodiment 2 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In the embodiment of the present invention, when the ROHC is used to perform packet header compression on the packet stream, the compression end and the decompression end switch the working mode in some cases, for example, switching from the U or 0 mode to the R mode; The learning efficiency of context information, effectively utilizing the learning experience before the work mode switching, provides a working mode switching method and device for the ROHC layer. Embodiment 1 This embodiment provides a working mode switching method for a ROHC layer, which is applicable to a compression end and a decompression end. Referring to FIG. 1, the method includes the following steps (step S102 - step S106): Step S102, where ROHC is required When the working mode of the layer is switched, it is determined whether the context information conversion is needed according to the working mode before and after the switching; for example, if the current working mode is the one-way working mode (U mode) or the bidirectional optimized working mode (0 mode) (it can also be simplified In "U/0 mode"), when switching to the bidirectional reliable working mode (R mode), it is determined that the context information conversion is required; or, if the current working mode is the R mode bidirectional reliable working mode, to switch to the one-way working mode Or when optimizing the working mode in both directions, it is determined that context information conversion is required. Step S104, if yes, setting context information of the switched working mode according to context information of the current working mode; the context information in this embodiment refers to context information of an element, and the context information is usually saved in an element and label relationship table. (ie, Table table) and link library (List library), the element and label relationship table and the link library specifically include the same content in the related art, for example, in the R mode, the Table table is as shown in Table 1 above. ; In U/0 mode, the Table table is as shown in Table 2 above. Based on this, setting context information of the switched working mode according to the context information of the current working mode includes:

1) setting context information in the second element and the label relationship table according to the context information in the first element and the label relationship table, wherein the first element and the label relationship table are elements and label relationship tables learned in the current working mode, The two element and label relationship table is an element and label relationship table corresponding to the switched working mode;

2) setting context information in the second link library according to the context information in the first link library, where the first link library is a link library learned in the current working mode, and the second link library is switched The link library corresponding to the working mode. For the case where the current working mode is the one-way working mode or the two-way optimized working mode, and the working mode after the switching is the two-way reliable working mode, the second element and the label relationship table are set according to the context information in the first element and the label relationship table. The context information includes: Finding the element send count in the first element and label relationship table An element whose value reaches the first upper limit is set, and the known bit corresponding to the found element in the second element and the tag relationship table is the determined identifier; in this case, the foregoing is set according to the context information in the first link library. The context information in the second link library includes: searching, in the first link library, a link whose link transmission count value reaches a second upper limit, and setting the found link as a reference link on the second link. In the library. For the case where the current working mode is the two-way reliable working mode, and the working mode after the switching is the one-way working mode or the two-way optimized working mode, the second element and the label relationship table are set according to the context information in the first element and the label relationship table. The context information includes: counting the number of the packet sequence number SN corresponding to each element in the label relationship table of the first element; and using the number of statistics as the sending count value of the corresponding element in the second element and the label relationship table, and Setting, in the second element and the label relationship table, a known bit corresponding to the element whose transmission count value reaches the first upper limit is set as the determined identifier; in this case, setting the second according to the context information in the first link library The context information in the link library includes: counting the number of the packet sequence number SN corresponding to each link in the first link library; using the number of statistics as the sending count value of the corresponding link in the second link library The link that sends the count value to the second upper limit is used as the reference link. In the above conversion process, the linked list identifier Gen_Id and the packet serial number identifier SN can be directly assigned to each other. Of course, it is determined that the context information conversion is not required according to the working mode before and after the handover, for example, the switching between the U mode and the 0 mode; in this case, after the working mode switching, the context information before the switching is directly used for compression. With unzipping. Step S106, initiating a working mode switching. The step S106 may also be performed first, that is, the context information is switched after the working mode is switched. After the working mode switching is initiated, the method further includes: compressing or decompressing the element according to the context information of the switched working mode. In this embodiment, the element context information after switching is set by fully utilizing the element context information learned before the switching, so that the element context information before the switching does not need to be emptied again, and the learning resource waste in the ROHC working mode switching is solved. , improve the utilization of system resources. At the same time, when using the inherited element context for compression/decompression, the efficiency and compression of compression can be improved. The implementation of the above method mainly considers that the physical data of the Table and the List library maintained by the compressor and the decompressor in the U/0 mode and the R mode are consistent, that is, the actual maintained item values are consistent, for the U/0 mode and the R mode. Context difference, the following conversion: First, Gen_Id and SN can uniquely identify a data packet in U/0 mode and R mode, so when U/0 mode and R mode switch to each other, Gen_Id and SN are simultaneously The value can be converted. The Gen_Id is randomly generated for the first time. For the next data packet, the Gen_Id value is optionally added according to the change of the data packet. At the same time, the Gen_Id is used to identify the data packet. The SN is the data packet and can be A field that uniquely identifies a packet; since both Gen_Id and SN can uniquely identify a packet, then in the mode conversion process, the two fields are assigned to each other. Secondly, when switching from U/0 mode to R mode, the list in the List library that reaches the upper limit of the list transmission can be selected as the reference list. When the mode is switched from the R mode to the U/0 mode, all the list tables in the list are listed. The corresponding number of SNs is converted into the number of times the list is sent in the U/0 mode, and then the list selection that reaches the upper limit of the list transmission is selected as the reference list. Finally, for all mode switching, the correspondence between index and item remains unchanged. When the U/0 mode is switched to the R mode, the item in the Table table that reaches the upper limit of the item is set to a known bit (SP, The corresponding Kown is set to 1). When the mode is switched from the R mode to the U/0 mode, the number of SNs corresponding to all the items in the Table is converted to the number of times the item is sent in the U/0 mode, and then the item is sent to the upper limit. The item is set to a known bit. Because the linked list context information maintained in the U mode and the 0 mode is consistent, when the U mode and the 0 mode are switched to each other, it is not necessary to clear the linked list context information, and the context information does not need to be converted as described above. The following is an example of switching from R mode to U mode to illustrate the processing mode during the working mode switching process: the current mode is R mode, the switching mode is U mode, the current reference list SN is 21, and the actual list value is (3500, 3600, 3601), the corresponding index is (0, 2, 3), assuming that the SN of the list to be sent after mode switching is 24, the actual list value is (3500, 3600, 3601, 3602), compressor and decompression The Talbe table in the R mode is shown in Table 3, and the List library is shown in Table 4. table 3

Table 4

After the mode is switched, if the Talbe table and the List library and the corresponding context information are cleared, then the list information of the data packet of the SN=24 to be sent needs to be sent to the decompression end, that is, the actual list (3500, 3600, 3601). 3602) The original value is sent, and then the compression end and the decompression end re-synchronize the context information, and maintain the Talbe table and the List library. If the above-mentioned working mode switching method provided by this embodiment is adopted, the Talbe table and the List library are not emptied, but are converted, and the converted Talbe table is as shown in Table 5. The converted List library is as shown in Table 6. Show.

table 5

Counter

Index i (label i) Known (known bit) Item (兀素)

(element count value)

0 1 3500 4

1 1 3501 2

2 1 3600 4

3 1 3601 4 Table 6

After the mode is switched, the compressor and the decompressor still save the converted Talbe table and the List library, and the corresponding context information. At this time, the list information of the packet to be sent with SN=24 can be compressed and sent, since the current reference list is ( 3500, 3600, 3601), the list to be sent is (3500, 3600, 3601, 3602). According to the principle of linked list compression, only the difference between the current list and the reference list needs to be sent, that is, only (3602) needs to be sent to the decompression end. can. According to the foregoing method provided in this embodiment, it is ensured that the context information of the linked list maintained by the compression end and the decompression end is not cleared in various mode switching processes, but is effectively inherited through conversion, thereby ensuring compression under the linked list. Seamless mode switching effectively improves the efficiency of linked list compression after mode switching. Embodiment 2 This embodiment provides an ROHC layer working mode switching device. The device may be disposed on a physical device of a compression end or a decompressing end. Referring to FIG. 2, the device includes: an information conversion determining module 22, configured to be required When the operation mode switching of the ROHC layer is performed, it is determined whether the context information conversion is required according to the operation mode before and after the switching; the information setting module 24 is connected to the information conversion judging module 22, and is set to be when the judgment result of the information conversion judging module 22 is YES. And setting context information of the switched working mode according to the context information of the current working mode; the mode switching module 26 is connected to the information setting module 24, and is set to initiate the working mode switching. Preferably, the information conversion judging module 22 includes: a first determining unit, configured to determine that a context information conversion is required when the current working mode is a one-way working mode or a bidirectional optimal working mode; or The second determining unit is configured to determine that the context information conversion is required if the current working mode is the bidirectional reliable working mode and is to be switched to the one-way working mode or the bidirectional optimized working mode. The information setting module 24 includes: a relationship table setting unit configured to set context information in the second element and the label relationship table according to the context information in the first element and the label relationship table, where the first element and the label The relationship table is an element and label relationship table learned in the current working mode, and the second element and label relationship table is an element and label relationship table corresponding to the switched working mode; the link library setting unit is set according to the first link library The context information in the second link library is set, wherein the first link library is a link library learned in the current working mode, and the second link library is a link library corresponding to the switched working mode. According to different working modes before and after switching, the relationship table setting unit and the link library setting unit may be implemented by two types. The mode 1 is a one-way working mode or a bidirectional optimized working mode for the current working mode, and the working mode after the switching is two-way. In the case of reliable working mode, mode 2 is for the current working mode as the two-way reliable working mode, and the working mode after the switching is the one-way working mode or the two-way optimized working mode. The following two methods are described in detail below. Method 1: The foregoing relationship table setting unit includes: an element search subunit, configured to set the current working mode to a one-way working mode or a two-way optimized working mode, and when the switched working mode is a two-way reliable working mode, the relationship between the first element and the label The element in the table is configured to send an element whose count value reaches the first upper limit; the first relationship table sets the subunit, and is set to be a known bit corresponding to the element found by the element search subunit in the second element and the tag relationship table. The link library setting unit includes: a link search subunit, configured to set the current working mode to a one-way working mode or a bidirectional optimized working mode, and the working mode after the switching is a two-way reliable working mode, in the first chain A link in the road library for finding a link transmission count value reaching a second upper limit; a first link library setting subunit, configured to set the link found by the link lookup subunit as a reference link in the second chain In the road library. Manner 2: The foregoing relationship table setting unit includes: an element statistics subunit, configured to set the current working mode to a bidirectional reliable working mode, and when the switched working mode is a one-way working mode or a bidirectional optimized working mode, the relationship between the first element and the label is counted. The number of the packet sequence number SN corresponding to each element in the table; the second relationship table setting subunit, set to count the number of statistics of the element statistics subunit as the sending count value of the corresponding element in the second element and the label relationship table And setting, in the second element and the label relationship table, a known bit corresponding to the element whose sending count value reaches the first upper limit is set as the determined identifier; the link library setting unit includes: a link statistics subunit, set to The current working mode is a two-way reliable working mode, and the number of data packet sequence numbers SN corresponding to each link in the first link library is counted when the working mode after the switching is the one-way working mode or the two-way optimized working mode; Link library setting subunit, set to link The number of statistics subunit statistics is used as the transmission count value of the corresponding link in the second link library, and the link whose transmission count value reaches the second upper limit is used as the reference link. In the above conversion process, the linked list identifier Gen_Id and the packet serial number identifier SN can be directly assigned to each other. In order to implement the compression and decompression functions, the foregoing apparatus may further include: a compression and decompression module 32, configured to perform compression or decompression of elements according to context information of the switched operation mode after the operation mode switching is initiated. In this embodiment, the element context information after switching is set by fully utilizing the element context information learned before the switching, so that the element context information before the switching does not need to be emptied again, and the learning resource waste in the ROHC working mode switching is solved. , improve the utilization of system resources. At the same time, when using the inherited element context for compression/decompression, the efficiency and compression of compression can be improved. As can be seen from the above description, the above embodiment can ensure that the linked list context information maintained by the compression end and the decompression end is not cleared during the various mode switching processes, but is effectively inherited through the conversion, thereby ensuring the linked list. Seamless mode switching under compression effectively improves the efficiency of linked list compression after mode switching. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A robust head compression protocol ROHC layer working mode switching method includes: when the working mode switching of the ROHC layer is required, determining whether context information conversion is required according to the working mode before and after the switching;

If yes, the context information of the switched working mode is set according to the context information of the current working mode, and the working mode switching is initiated.

The method according to claim 1, wherein the determining whether the context information conversion is required according to the working mode before and after the switching comprises:

If the current working mode is the one-way working mode or the two-way optimized working mode, if it is desired to switch to the two-way reliable working mode, it is determined that context information conversion is required; or

If the current working mode is the bidirectional reliable working mode, if you want to switch to the one-way working mode or the two-way optimized working mode, it is determined that the context information conversion is required.

The method according to claim 1, wherein the setting the context information of the switched working mode according to the context information of the current working mode comprises:

Setting the context information in the second element and the label relationship table according to the context information in the first element and the label relationship table, where the first element and the label relationship table are the element and label relationship table learned in the current working mode, The second element and the label relationship table are an element and label relationship table corresponding to the switched working mode;

Setting the context information in the second link library according to the context information in the first link library, where the first link library is a link library learned in the current working mode, and the second link library is a working mode after the switching Corresponding link library.

The method according to claim 3, wherein the current working mode is a one-way working mode or a two-way optimized working mode, and when the switched working mode is a two-way reliable working mode,

Setting the context information in the second element and the label relationship table according to the context information in the first element and the label relationship table includes: searching for the element sending count value in the first element and the label relationship table to reach a first upper limit The element, the known bit corresponding to the found element in the second element and the tag relationship table is the determined identifier; Setting the context information in the second link library according to the context information in the first link library includes: searching, in the first link library, a link whose link transmission count value reaches a second upper limit, The found link is set as a reference link in the second link library.

The method according to claim 3, wherein the current working mode is a two-way reliable working mode, and when the switched working mode is a one-way working mode or a two-way optimized working mode,

The setting the context information in the second element and the label relationship table according to the context information in the first element and the label relationship table comprises: counting the data packet sequence number SN of the first element corresponding to each element in the label relationship table. The number of the statistics is used as the sending count value of the corresponding element in the second element and the label relationship table, and the sending count value reaches the first upper limit in the second element and label relationship table. The known bit corresponding to the element is set to the identified identifier;

Setting the context information in the second link library according to the context information in the first link library includes: counting the number of the data packet sequence number SN corresponding to each link in the first link library; The number is used as a transmission count value of a corresponding link in the second link library, and a link whose transmission count value reaches a second upper limit is used as a reference link.

The method according to any one of claims 1-5, wherein after the initiating the working mode switching, the method further comprises:

The element is compressed or decompressed according to the context information of the switched operating mode.

7. A robust head compression protocol ROHC layer operating mode switching device, comprising:

The information conversion judging module is configured to determine whether the context information conversion is required according to the working mode before and after the switching when the working mode switching of the ROHC layer is required;

The information setting module is configured to: when the determination result of the information conversion judging module is yes, set the context information of the switched working mode according to the context information of the current working mode;

The mode switching module is set to initiate a working mode switching.

The device according to claim 7, wherein the information conversion determining module comprises:

a first determining unit, configured to determine that a context information conversion is required when the current working mode is a one-way working mode or a two-way optimized working mode, or to switch to a two-way reliable working mode; or, the second determining unit is set to if the current working The mode is a two-way reliable working mode. When switching to the one-way working mode or the two-way optimized working mode, it is determined that context information conversion is required.

9. The apparatus according to claim 7, wherein the information setting module comprises: a relation table setting unit configured to set a context in the second element and the label relationship table according to the context information in the first element and the label relationship table The information, where the first element and the label relationship table are the element and label relationship table learned in the current working mode, and the second element and the label relationship table are the element and label relationship table corresponding to the switched working mode;

The link library setting unit is configured to set context information in the second link library according to the context information in the first link library, where the first link library is a link library learned in the current working mode, and the second chain The road library is the link library corresponding to the working mode after the switching.

The device according to claim 9, wherein the relationship table setting unit comprises:

An element search subunit, configured to: the current working mode is a one-way working mode or a bidirectional optimized working mode, and when the switched working mode is a two-way reliable working mode, searching for an element in the first element and the label relationship table Sending an element whose count value reaches the first upper limit;

a first relationship table setting subunit, configured to set the element in the second element and the tag relationship table, and the known bit corresponding to the element found by the lookup subunit is the determined identifier;

The link library setting unit includes:

a link search subunit, configured to: the current working mode is a one-way working mode or a bidirectional optimized working mode, and when the switched working mode is a bidirectional reliable working mode, searching for a link in the first link library Sending a link whose count value reaches the second set upper limit;

The first link library setting subunit is configured to set the link found by the link lookup subunit as a reference link in the second link library.

11. The device according to claim 9, wherein

The relationship table setting unit includes:

An element statistic subunit, configured to: the current working mode is a bidirectional reliable working mode, and when the switched working mode is a unidirectional working mode or a bidirectional optimized working mode, each of the first element and the tag relationship table is counted The number of the packet sequence number SN corresponding to the element;

a second relationship table setting subunit, configured to use the number of the element statistics subunit statistics as a sending count value of the corresponding element in the second element and the label relationship table, and in the second element and the label The known bit corresponding to the element whose sending count value reaches the first upper limit is set as the determined identifier in the relation table; The link library setting unit includes:

a link statistics subunit, configured to: the current working mode is a bidirectional reliable working mode, and when the switched working mode is a one-way working mode or a bidirectional optimized working mode, each chain in the first link library is counted The number of data packet sequence numbers SN corresponding to the road;

a second link library setting subunit, configured to use the number of the statistics of the link statistics subunit as a sending count value of a corresponding link in the second link library, and send the sending count value to a second setting The upper limit link is used as the reference link.