CN100471344C - System message cutting method - Google Patents
System message cutting method Download PDFInfo
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- CN100471344C CN100471344C CNB2007100730589A CN200710073058A CN100471344C CN 100471344 C CN100471344 C CN 100471344C CN B2007100730589 A CNB2007100730589 A CN B2007100730589A CN 200710073058 A CN200710073058 A CN 200710073058A CN 100471344 C CN100471344 C CN 100471344C
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Abstract
A method for cutting system message down includes precoding system message, calculating total length of system message being precoded and length of each message unit being precoded, comparing total length being precoded with specified length, cutting down message unit in system message by network side when total length being precoded is greater than specified length and ending the coding when total length being precoded is less than specified length.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to a kind of method of regulating system message length in the mobile communication system.
Background technology
Code Division Multiple Access (CDMA) (CDMA) is as a kind of spread spectrum mobile communication technology, and it is mainly used in the military communication field at first, because its remarkable performance, this technology is current to obtain increasingly extensive application in the commercial communication field.Current, just exist cdma cellular mobile communication system with commercialization to be carried out at concrete instance in the telecommunications network.
In cellular mobile telecommunication system, whole network is made up of some sub-districts that are divided, and different sub-districts is according to the different cell configuration attribute of actual conditions configuration.Configuration attribute specifically can comprise affiliated public land mobile network (PLMN) zone, sub-district, sub-district available channel type etc.These configuration attributes are only relevant with the sub-district, and little with the customer relationship in the sub-district, in order effectively to improve the efficient of such configuration attribute information of Network Transmission, generally adopt the mode of broadcasting to transmit these information in the various mobile communication system.(Broadcast Channel BCH), comprises the system information of cell configuration attribute information to its concrete means by broadcast channel broadcasts in order to increase broadcast channel in each sub-district.The user who enters this sub-district obtains the system message of this sub-district by receiving broadcast, thereby finishes in the mobile information system network terminal to the general controls of users of all cells.
Broadband CDMA (WCDMA) system is a kind of in the above-mentioned cdma cellular mobile communication system, in this system, the system information that broadcast channel sent comprises: System information block (SystemInformation Block, SIB), Master Information Block (MIB) and schedule information piece (SB), wherein SIB can be used to notify the information of information, common signal channel of information, the registration area of all subscriber-related core net in the sub-district and adjacent area cell information etc.
In said system message, be example with system message 11 (SIB11).SIB11 is used for UE and carries out cell selecting, the measuring control information that comprises information units such as homogeneous-frequency adjacent-domain, alien frequencies adjacent area, different system adjacent area, its by RNC by the man-machine interface setting, when being provided with, only follow the agreement regulation: homogeneous-frequency adjacent-domain, alien frequencies adjacent area, different system adjacent area are no more than 32 separately.(PackedEncoding Rules PER) behind the coding, is handed down to UE by the BCH transmission channel to system message with tightening coding rule.Because agreement regulation, if length has surpassed 226bit behind the system message block encoding, then need this system message segmentation, and the System information block behind each coding can only divide 16 sections at most, the size of each section is 222bit to the maximum, and promptly the SIB11 maximum length is 3552bit.Therefore, there are two problems here:
If the number of the same frequency among 1 SIB11, alien frequencies and different system adjacent area all reaches maximum number 32, SIB11 carries out PER coding back length considerably beyond 16*222=3552bit, then this SIB11 can't be divided into 16 sections, system message can't be transmitted accurately, the system message update failure influences the mobility of user in the sub-district.
2, because the complexity of PER coding rule, the user is when being provided with the adjacent area number, can't know be set to what adjacent areas after, code stream length behind the coding can satisfy the requirement less than 3552bit, after bringing the user that homogeneous-frequency adjacent-domain, alien frequencies adjacent area, different system adjacent area are set thus, can't know that system message update will successfully still fail, bring the unsteadiness of system.
In fact, same problem also exists in other the system information.In view of the foregoing, the present invention proposes a kind of cutting method of system message, makes system message length protocol compliant specific length.
Summary of the invention
The object of the present invention is to provide a kind of by reducing the method for system message, the stability that the realization system message is passed on.
Goal of the invention of the present invention is achieved through the following technical solutions: a kind of system message cutting method comprises system message is carried out precoding, length after each the message elements precoding that comprises in total length after the precoding of computing system message and the system message, total length after the precoding and the specific length obtained are compared: when the total length after the precoding during greater than specific length, network side is reduced the message elements in the system message; When the total length after the precoding during less than specific length, end-of-encode.
The embodiment of the invention utilizes the deletion of individual message unit in the system message can not produce the characteristics of considerable influence to performance, by message elements in the system message is deleted, need pass through the operation of complex process restriction of message unit when having avoided constructing system message, thereby the length of system message is limited within the prescribed limit.
Description of drawings
Fig. 1 is a cutting method flow chart of reducing system message in the embodiment of the invention automatically.
Embodiment:
In order to make purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is described in further detail the present invention.
In the embodiments of the invention, network side carries out precoding to system message such as SIB11, each message elements that comprises in total length after the precoding of computing system message and the system message such as the length after the neighboring BS information precoding, total length after the precoding and specific length are compared: when the total length after the precoding during greater than specific length, network side is reduced the message elements in the system message; When the total length after the precoding during less than specific length, end-of-encode.
See also shown in Figure 1ly,, embodiments of the invention are further described below in conjunction with accompanying drawing.
101. network side carries out precoding to system message, the total length after the precoding of computing system message calculates the length after the message elements precoding that comprises in this system message simultaneously.For instance, this system message can be SIB11, and it is used for UE and carries out cell selecting, comprises the measuring control information of homogeneous-frequency adjacent-domain, alien frequencies adjacent area, different system adjacent area.Because the indivedual adjacent areas of configuration are leaked in sub-district, can not influence going into operation of this sub-district, can appreciable impact UE yet in the mobility of this sub-district, based on this prerequisite, the information that comprises among this SIB11 promptly can be as message elements as neighboring BS information.
102. obtain the specific length information of system message, and the system message after the comparison precoding and the specific length of this system message.Because system message is handed down to UE by the BCH transmission channel usually in the communication system, therefore upgrade failure for fear of system information, system all makes regulation to the length of system information usually.For instance, the specific length of system message SIB11 can not surpass 3552bit.Need to prove, obtain the step of the specific length information of system message here and can before network side carries out precoding to system message, carry out, also can after precoding is finished, carry out.
When the specific length of the discontented pedal system message of the system message after the precoding required, the flow process of embodiment turned to 103, otherwise end-of-encode.
103. deletion message elements.Give an example with SIB11 once more, the SIB11 total length after judging precoding is during greater than the specific length 3552bit of system message herein, and network side can carry out the part deletion to message elements among the SIB11 such as neighboring BS information.The mode of deletion, for instance, it can be the deletion of randomness ground, as deleting at random in the mode of homogeneous-frequency adjacent-domain, alien frequencies adjacent area and different system adjacent area difference in the message elements of not considering SIB11, perhaps, the mode that keeps an adjacent area at least with every type of adjacent area in the message elements is deleted at random.
104. behind the deletion message elements, the system message total length of network side after to precoding refreshes.Usually, the system message total length after the former precoding is deducted the length of deleted message elements precoding, the system message total length after promptly can obtaining refreshing.With SIB11 is example, and refreshing herein promptly is that SIB11 total length after the precoding deducts deleted neighboring BS information precoding length.
105. compare system message total length and specific length after the precoding once more.When satisfying requiring of specific length as the system message length behind the deletion message elements, the flow process of embodiment turns to 106, otherwise returns 103, continues the deletion message elements.
106. network side is encoded the automatic deletion flow process of ends with system message to the system information of deletion behind the message elements.For instance, when network side carried out the part deletion to the message elements among the SIB11 such as neighboring BS information after, the SIB11 after the precoding was less than 3552bit, at this moment, network side also needs system message is refreshed, and uses the SIB11 after refreshing to encode, and finishes the reduction flow process of SIB11.
Embodiments of the invention utilize the deletion of individual message unit in the system message can not produce the characteristics of considerable influence to performance, by message elements in the system message is deleted, need pass through the operation of complex process restriction of message unit when having avoided constructing system message, thereby the length of system message is limited within the prescribed limit.With SIB11 is example, has promptly avoided the restriction to neighbor cell configuration information, and the easy operation by to the neighboring BS information deletion meets the demands the length of SIB11.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. the cutting method of a system message is characterized in that, this method comprises
System message is carried out precoding, each message elements length in computing system message total length and this system message;
Obtain the specific length information of system message;
When the system message total length after the precoding during, reduce message elements in this system message greater than the specific length of system message.
2. according to the described method of claim 1, it is characterized in that described system message is a system message 11.
3. according to claim 1 or 2 described methods, it is characterized in that described message elements is a neighboring BS information.
4. method according to claim 3 is characterized in that, described neighboring BS information comprises homogeneous-frequency adjacent-domain information, alien frequencies neighboring BS information and different system neighboring BS information.
5. method according to claim 4 is characterized in that, described reduction is for reducing at random.
6. according to the described method of claim 1, it is characterized in that, when the system message total length after the precoding when reducing the specific length less than system message, system message is refreshed, and coding once more.
7. according to the described method of claim 1, it is characterized in that this method further comprises when the system message total length after the precoding during greater than the specific length of system message, notifies this message elements of user to be provided with too much, reduced, be convenient to the relevant configuration of user's modification.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100730589A CN100471344C (en) | 2007-03-07 | 2007-03-07 | System message cutting method |
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| CNB2007100730589A CN100471344C (en) | 2007-03-07 | 2007-03-07 | System message cutting method |
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| CN101022589A CN101022589A (en) | 2007-08-22 |
| CN100471344C true CN100471344C (en) | 2009-03-18 |
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| CN101159985B (en) * | 2007-11-01 | 2010-11-10 | 中兴通讯股份有限公司 | Overload control method and device for control channel of wireless communication system |
| CN101771947B (en) * | 2008-12-29 | 2013-03-20 | 中兴通讯股份有限公司 | Processing method for updating system messages and user terminal |
| CN102761835A (en) * | 2012-07-06 | 2012-10-31 | 中兴通讯股份有限公司 | Method and device for transmitting broadcast overhead message |
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