CN102932845A - System message transmission method, network element and system - Google Patents
System message transmission method, network element and system Download PDFInfo
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- CN102932845A CN102932845A CN2011102286866A CN201110228686A CN102932845A CN 102932845 A CN102932845 A CN 102932845A CN 2011102286866 A CN2011102286866 A CN 2011102286866A CN 201110228686 A CN201110228686 A CN 201110228686A CN 102932845 A CN102932845 A CN 102932845A
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Abstract
The invention discloses a system message transmission method, a network element and a system. The method comprises the following steps of: determining that information in a system message, for indicating access overload, changes by a network side; and when scheduling a system message block containing information for indicating the access overload next time by the network side, using the changed information for indicating the access overload in the system message block. According to the invention, the effectiveness and stability of the system are enhanced.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of transmission method, network element and system of system message.
Background technology
Subscriber equipment (User Equipment referred to as UE, also can be described as terminal) need to be carried out initial access judgement when access network, can be used for judging initiating business request, avoids causing overload such as random access overload or the signaling overload of network side.At universal mobile telecommunications system (Universal Mobile Telecommunications System, referred to as UMTS) and Long Term Evolution (Long Term Evolution, referred to as LTE) in the system, subscriber equipment can be divided into 16 access grade (Access Class, referred to as AC), wherein, AC 0～9 belongs to common grade, and Random assignment is to terminal; AC 10 expression urgent calls (can not configure to terminal); AC 11 is used for network operation; AC 12 is safety service; AC 13 is public service classification (such as water, gas supplier); AC 14 expression urgency traffics; The AC 15 expression staff of operator.Terminal can be configured to rank in AC0～9 and the one or more ranks among the AC 11～15, and these configuration informations are kept in the Subscriber Identity Module (Universal Subscriber Identity Module is referred to as USIM).
Network side meeting broadcast system message among the UMTS, wherein comprise access grade control (Access Class Barred, referred to as ACB) parameter, for different access grades, ACB corresponding to network side broadcasting, ACB is configured to enumeration type (forbid (barred), allow (not barred)).If subscriber equipment needs initiating business request, whether the ACB parameter that subscriber equipment at first needs to check the Cell Broadcast CB that accesses forbids (barred) access grade under own, if forbidden, then subscriber equipment can not initiating business request; If do not forbid, then can initiating business request.
Network side in the long evolving system also can be broadcasted the ACB parameter, and for the terminal of AC 0～9, network side can be broadcasted the probability that access scale factor (ac-BarringFactor) is used for control subscriber equipment access network.UE produces equally distributed number (RAND) between 0 to 1 at random when the needs initiating business request, if this RAND is lower than the access scale factor, then UE can initiating business request; Otherwise UE can not initiating business request.
In the implementation procedure of Internet of Things, introduced a large amount of equipment for machine type communication (Machine Type Communication Device is referred to as MD).These equipment are because One's name is legion, quantity considerably beyond existing subscriber equipment, network side is in order to prevent signaling overload or random access overload etc., introduced access control (the Extended Access Barring of expansion, referred to as EAB) mechanism, the subscriber equipment (comprising the configuration of EAB in the usim card of UE, UE configured with EAB) that is applicable to EAB need to judge whether to allow the access network initiating business request according to the EAB parameter of network side broadcasting.
Fig. 1 is the schematic diagram according to the system message update of correlation technique, as shown in Figure 1, in LTE, the update mechanism of existing system message is: if system message need to be upgraded, the base station need to be in the modification cycle of first systematic message (Modification Period is referred to as MP), by the information of call signaling notice UE system message alteration, wherein, the modification cycle of system message is by the configuration of before system message; Within the modification cycle of second system message, the system message after upgrading will be broadcasted in the base station, and UE is in the modification cycle of second system message, and receiving system message obtains to upgrade system message afterwards, thus the renewal of completion system message.
According to existing agreement, the modification cycle minimum value of system message is 640 milliseconds, and maximum can be the several seconds.If the base station finds that the equipment for machine type communication quantity of access network is too many, need to change existing EAB parameter in order to make the equipment for machine type communication access network of lesser amt (perhaps quantity is zero), will new EAB parameter be come into force at least.Before new EAB parameter came into force, the equipment for machine type communication of expectation access network still adopted original EAB parameter to implement the access judgement, and this may cause network side further to transship.
Consider that equipment for machine type communication quantity is too many, when restoring electricity in earthquake or after having a power failure, these terminals simultaneously access network cause the load of network side sharply to increase, if adopt existing system message treatment mechanism, the time delay that system message update causes (the modification cycle that surpasses a system message) can not be implemented control to the equipment for machine type communication of expectation access network soon, and these equipment for machine type communications are initiated the overload that random access will cause network side continually.
In addition, also there are some parameters that need frequent updating in the system message of network side, adopts existing system message update mechanism can cause the load increase of call signaling and subscriber equipment can not in time use the new problems such as parameter.
Summary of the invention
Main purpose of the present invention is to provide a kind of transmission plan of system message, causes network side overload or the untimely problem of parameter renewal with the system message update mechanism that solves at least in the above-mentioned correlation technique.
To achieve these goals, according to an aspect of the present invention, provide a kind of transmission method of system message.
Transmission method according to system message of the present invention may further comprise the steps: network side determines that the information that is used for sign access overload in the system message changes; When network side comprises the System information block of the information of transshipping for the sign access in next time scheduling, in this System information block, use the information that sign accesses overload that is used for after changing.
Preferably, it is one of following at least that the information that is used for sign access overload comprises: EAB parameter, ACB parameter, random access control parameter, Common Control Channel configuration parameter, be used to indicate the cell of network side overload.
Preferably, network side is determined that the information that is used for sign access overload in the system message changes and comprised: when the present load in the residential quarter of network side changed, network side determined that the information that is used for sign access overload in the system message changing.
Preferably, before network side determines that the information that is used for sign access overload in the system message changes, also comprise: network side arranges whether subscriber equipment needs to be used for from the network side active obtaining information of sign access overload when the access residential quarter cell according to type and/or the state of the subscriber equipment of access residential quarter in system message.
Preferably, after the information that is used for sign access overload after network side uses in System information block and changes, also comprise: subscriber equipment is when the needs initiating business request, obtain the information that is used for sign access overload after the change in the System information block, and implement initial access judgement according to the information that is used for sign access overload after changing.
Preferably, the information that is used for sign access overload of obtaining after the change in the System information block comprises: the schedule information that subscriber equipment is preserved by this locality obtains the time slot scheduling of System information block, and reads the information that is used for sign access overload after the change according to time slot scheduling from System information block.
Preferably, subscriber equipment is implemented initial access judgement according to the information that is used for sign access overload after changing and is comprised: if the court verdict of initial access judgement is for allowing, the user equipment start service request connects to set up RRC, otherwise subscriber equipment initiating business request not.
Preferably, after network side determined that the information that is used for sign access overload in the system message changes, also comprise: network side did not pass through the change of call signaling notifying user equipment system message.
To achieve these goals, according to a further aspect in the invention, also provide a kind of transmission network element of system message.
The transmission network element of system according to the invention message comprises: determination module is used for determining that the information that is used for sign access overload of system message changes; Scheduler module is used for when next time scheduling comprises the System information block of the information of transshipping for the sign access, uses the information that sign accesses overload that is used for after changing in this System information block.
Preferably, network element is evolution base station in the LTE system or the radio network controller among the UMTS.
To achieve these goals, in accordance with a further aspect of the present invention, also provide a kind of transmission system of system message.
Transmission system according to system message of the present invention, the transmission network element that comprises subscriber equipment and said system message, wherein, subscriber equipment comprises: acquisition module, be used for when the needs initiating business request, obtain from the information that is used for sign access overload after the change in the System information block of network element; Judge module, the information that is used for sign access overload after the change that is used for obtaining according to acquisition module is implemented initial access judgement.
By the present invention, after the information that is used for sign access overload of Adoption Network side in determining system message changes, in next time scheduling when comprising the System information block of this information, in System information block, use the mode of this information after changing, the system message update mechanism in the correlation technique that solved causes network side overload or the untimely problem of parameter renewal, has improved validity and the stability of system.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the system message update of correlation technique;
Fig. 2 is the flow chart according to the transmission method of the system message of the embodiment of the invention;
Fig. 3 is the structured flowchart according to the transmission network element of the system message of the embodiment of the invention;
Fig. 4 is the structured flowchart according to the transmission system of the system message of the embodiment of the invention;
Fig. 5 is the schematic flow sheet of revising the EAB parameter according to the base station of the embodiment of the invention three;
Fig. 6 is the schematic flow sheet that obtains system message according to the subscriber equipment of the embodiment of the invention three.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.
According to the embodiment of the invention, provide a kind of transmission method of system message.Fig. 2 is the flow chart according to the transmission method of the system message of the embodiment of the invention, and as shown in Figure 2, the method may further comprise the steps:
Step S202, network side determine that the information that is used for sign access overload in the system message changes;
When step S204, network side comprise the System information block of the information of transshipping for the sign access in next time scheduling, in this System information block, use the information that sign accesses overload that is used for after changing.
Pass through above-mentioned steps, after the information that is used for sign access overload of Adoption Network side in determining system message changes, in next time scheduling when comprising the System information block of this information, in System information block, use the mode of this information after changing, the system message update mechanism in the correlation technique that solved causes network side overload or the untimely problem of parameter renewal, has improved validity and the stability of system.
Preferably, it is one of following at least that the information that is used for sign access overload can comprise: EAB parameter, ACB parameter, random access control parameter, Common Control Channel configuration parameter, be used to indicate the cell of network side overload.The method can improve flexibility and the adaptive capacity of system.
Preferably, in step S202, when the present load in the residential quarter of network side changed, network side can determine that the information that is used for sign access overload in the system message changing.The method can provide basis for estimation for the access overload, has improved the operability of system.
Preferably, before step S202, network side can be according to type and/or the state of the subscriber equipment that accesses the residential quarter, and whether subscriber equipment is set in system message needs to be used for the cell that sign accesses the information of transshipping from the network side active obtaining when the access residential quarter.The method has improved the accuracy of system so that subscriber equipment can get access to up-to-date parameter information when the access residential quarter.
Preferably, after step S204, subscriber equipment can obtain from the information that is used for sign access overload after the change in the System information block of network side when the needs initiating business request, and implements initial access judgement according to the information that is used for sign access overload after changing.The method can improve the validity of system.
Preferably, the information that is used for sign access overload that subscriber equipment obtains after the change in the System information block comprises: the schedule information that subscriber equipment is preserved by this locality obtains comprising the time slot scheduling of the System information block of the information that is used for sign access overload after the change, and reads the information that is used for sign access overload after the change according to time slot scheduling from System information block.The method is simple and practical, workable.
Preferably, subscriber equipment is implemented initial access judgement according to the information that is used for sign access overload after changing and is comprised: if the court verdict of initial access judgement is for allowing, the user equipment start service request connects to set up RRC, otherwise subscriber equipment initiating business request not.
Preferably, after step S202, network side does not pass through the information of call signaling notifying user equipment system message alteration.For example, network side no thoroughfare the call signaling notifying user equipment information that is used for sign access overload changes.Namely, the present embodiment is different from the correlation technique information that adopts call signaling to come notifying user equipment to be used to identify the access overload and changes, be the method that adopts step S204, notifying user equipment changes for the information of sign access overload in time, thereby has improved the ageing of system.
Corresponding to said method, the embodiment of the invention also provides a kind of transmission network element of system message.Fig. 3 is the structured flowchart according to the transmission network element of the system message of the embodiment of the invention, and as shown in Figure 3, this network element 30 comprises: determination module 32 is used for determining that the information that is used for sign access overload of system message changes; Scheduler module 34 is coupled to determination module 32, is used for when next time scheduling comprises the System information block of the information of transshipping for the sign access, uses the information that sign accesses overload that is used for after changing in this System information block.
Pass through said network element, after the information that is used for sign access overload of determination module 32 in determining system message changes, scheduler module 34 is in next time scheduling when comprising the System information block of this information, in System information block, use this information after changing, the system message update mechanism in the correlation technique that solved causes network side overload or the untimely problem of parameter renewal, has improved validity and the stability of system.
Preferably, network element 30 is evolution base station in the LTE system or the radio network controller among the UMTS.
According to the embodiment of the invention, also provide a kind of transmission system of system message.Fig. 4 is the structured flowchart according to the transmission system of the system message of the embodiment of the invention, as shown in Figure 4, this system comprises subscriber equipment 42 and above-mentioned network element 30, wherein, subscriber equipment 42 comprises: acquisition module 422, be coupled to scheduler module 34, be used for when the needs initiating business request, obtain from the information that is used for sign access overload after the change in the System information block of network element 30; Judge module 424 is coupled to acquisition module 422, and the information that is used for sign access overload after the change that is used for obtaining according to acquisition module 422 is implemented initial access judgement.
Be elaborated below in conjunction with the implementation procedure of preferred embodiments and drawings to above-described embodiment.
Embodiment one
The present embodiment provides a kind of update method of dynamic parameter, revises the larger problem of system message delay to solve network side.At first, network side judges in the system message to only have the EAB parameter to change, and perhaps judges and only has the cell of indication network side overload to change in the system message; Then, when network side comprises the System information block of cell of EAB parameter or indication network side overload in next time scheduling, in this System information block, use EAB parameter after changing or the cell of indication network side overload.
Preferably, be applicable to the subscriber equipment of EAB when the needs initiating business request, at first obtain EAB parameter or the cell of indication network side overload, the new EAB parameter that the subscriber equipment foundation is obtained or initially access judgement of cell enforcement in the System information block.If subscriber equipment is implemented initial access judgement for allowing according to the EAB parameter, subscriber equipment can initiating business request; Otherwise subscriber equipment can not initiating business request.If described subscriber equipment finds that the cell of indication network side overload is true (True), described subscriber equipment does not allow initiating business request; Otherwise described subscriber equipment can initiating business request.
Update method by the dynamic parameter in the present embodiment, network side can be revised the EAB parameter in the system message immediately, can control as soon as possible the random access of subscriber equipment initiation, the load of control network side, solve in the existing system network side update system message and need to postpone a system message and revise the cycle, and caused network side can not successfully manage random access overload or the signaling overload problem of burst.
Embodiment two
Some public parameters need to be broadcasted by system message in the residential quarter, in order to make the subscriber equipment of Idle state can detect this residential quarter, know sign, location area information, public land mobile communication network network (the Public Land Mobile-communication Network of this residential quarter, referred to as PLMN) sign etc., so that UE can finish registration (Attach) and reside in this residential quarter by this residential quarter.Simultaneously, some control parameter and common signal channel (such as Random Access Channel) configuration parameters can be broadcasted in the residential quarter, in order to UE can be commenced business by access network, wherein, the control parameter comprises expansion access control parameter (Extended Access Barring) and access grade control parameter.
The residential quarter needs to consider the load condition of self when configuration control parameter and common signal channel parameter, adjust control parameter and common signal channel parameter according to the Different Dynamic ground of load condition.Because the load condition of residential quarter is real-time change, if the each time change of load condition all needs to revise control parameter and common signal channel parameter in the system message, this can cause system message update frequent, call signaling increases a lot, make simultaneously UE frequently update system message cause power consumption to increase.
In order to tackle this problem, in the present embodiment, parameter and common signal channel parameter are controlled except arranging in the residential quarter in system message, also increased indication UE whether need to be when the access residential quarter information of active obtaining system message, particularly, can for dissimilar subscriber equipment setting whether need to be when the access residential quarter information of active obtaining designated parameter.
For example, for the UE that is applicable to EAB, need the information of active obtaining EAB parameter; Perhaps, for the UE that is applicable to EAB and have the UE of special access grade AC11～15, need active obtaining ACB parameter; Perhaps, for the UE that is not suitable for EAB, need active obtaining ACB parameter; Perhaps, for all UE, need the active obtaining random access parameter; Perhaps, for all UE, need active obtaining ACB parameter; Perhaps, initiate the UE of time-delay professional (Delay Tolerant), need active obtaining EAB parameter; Perhaps, initiate the UE of signaling traffic, need active obtaining ACB parameter.
The residential quarter is provided with in system message for dissimilar subscriber equipment to be needed after the information of active obtaining designated parameter, if the current load in residential quarter changes, the residential quarter needs to revise (to be controlled by the base station under the residential quarter, be responsible for revising system message) designated parameter (such as EAB parameter or ACB parameter or Common Control Channel configuration parameter), the residential quarter does not need the information by the modification of call signaling notice UE system message, the residential quarter directly when comprising the System information block of designated parameter, arranges the designated parameter (i.e. the system message that transmission is upgraded) of renewal in next time scheduling.
In implementation process, UE for specified type in the system message, need to be at access network, before initiating random access, obtain new system message, mainly be to obtain the System information block that comprises designated parameter to obtain up-to-date EAB parameter or ACB parameter or Common Control Channel configuration parameter, then, utilize these parameters to implement initial access judgement (when being EAB parameter and/or ACB parameter for designated parameter), or utilize these parameters to initiate random access (when being the Common Control Channel configuration parameter for designated parameter).
Pass through the present embodiment, when network side is revised some parameter at needs, when dispatching the System information block that comprises these parameters, upgrade immediately them immediately next time, can not increase call signaling, make simultaneously UE can use soon these parameters, be conducive to network side and control rapidly Client-initiated and access at random quantity, the load of control network side.Although adopted new system message update mechanism in the present embodiment, do not introduce new System information block, so change less to existing protocol.
Preferably, the present embodiment can also have other implementation, for example, in advance the agreement subscriber equipment of arranging some type whether need to be when the access residential quarter information of active obtaining designated parameter, make an appointment such as agreement: for the UE that is applicable to EAB and have the UE of special access grade AC11～15, need active obtaining ACB parameter; Perhaps, for the UE that is not suitable for EAB, need active obtaining ACB parameter; Perhaps, for all UE, need the active obtaining random access parameter; Perhaps, for all UE, need active obtaining ACB parameter; Perhaps, initiate the UE of time-delay professional (Delay Tolerant), need active obtaining EAB parameter; Perhaps, initiate the UE of signaling traffic, need active obtaining ACB parameter.
In implementation process, for the UE that these agreements are made an appointment, need to be at access network, before initiating to access at random, obtaining new system message, mainly is to obtain the System information block that comprises designated parameter to obtain up-to-date EAB parameter or ACB parameter or Common Control Channel configuration parameter.
Embodiment three
The present embodiment has been described the method for network side modification expansion access control parameter in the LTE system.Base station 1 is a base station in the LTE system, has administered a plurality of residential quarters, wherein comprises residential quarter 1.In the system message of residential quarter 1, comprise expansion access control parameter (Extended Access Barring), be used for the UE access network that control is applicable to EAB.
When less by the subscriber equipment quantity of residential quarter 1 access network, the load of residential quarter 1 is lighter, the EAB parameter that base station 1 arranges in the system message of residential quarter 1 is looser, be 0.8 such as the access scale factor in the EAB parameter, base station 1 allows the subscriber equipment of 80% expectation access network can initiate random access like this, sets up the RAB that is used for professional transmission after accessing successfully at random.
If of short duration power outage has occured the zone that covers, residential quarter 1 this moment, the subscriber equipment of the One's name is legion in 1 coverage of residential quarter is attempted simultaneously access network and is registered after restoring electricity so.Because these subscriber equipmenies have lost state information when having a power failure, need again registration in order to can keep communicating by letter with network.Because the subscriber equipment of access network is very many simultaneously, the rapid increase of load of residential quarter 1 has been known in base station 1 by measurement, base station 1 overload occurs in order to prevent residential quarter 1, base station 1 determines to revise the EAB parameter of residential quarter 1, be set to 0.1 such as the access scale factor in the EAB parameter, can make like this 90% UE (being applicable to EAB) can not initiate random access, can effectively reduce the load of network side.
In implementation process, at first, the EAB parameter can be included in the System information block 2, and the EAB parameter of residential quarter 1 is revised in base station 1.Fig. 5 is the schematic flow sheet of revising the EAB parameter according to the base station of the embodiment of the invention three, and as shown in Figure 5, the step that the EAB parameter of residential quarter 1 is revised in base station 1 can comprise:
Step S501, base station 1 judges in the system message of residential quarter 1 that whether only the EAB parameter changes.If so, execution in step S502 then; Otherwise execution in step S504.
Step S502, call signaling is not revised in base station 1, the information of namely not revising by call signaling notifying user equipment system message.
Step S503, the next time transmission opportunity of System information block 2 is known according to the dispatching cycle (si-Periodicity) of System information block 2 in base station 1, comprises new EAB parameter in the System information block 2 that next time sends, for example, new access scale factor 0.1.
Step S504, base station 1 is within the modification cycle of the nearest system message of residential quarter 1, by the information of the subscriber equipment transmitting system message modification of call signaling in the coverage.In call signaling, the cell that base station 1 arranges systemInfoModification is True, is used for the expression system message and revises.The modification cycle of nearest system message can be that base station 1 makes a policy modification cycle of corresponding system message when need revising system message herein, also may be that base station 1 makes a policy and need to revise the modification cycle of a system message after the system message, because base station 1 needs to guarantee that all subscriber equipmenies all can receive call signaling, the modification cycle boundary of system of distance message was very near when needs were revised system message if base station 1 makes a policy, when being not enough to all subscriber equipment of paging, the modification cycle that next system message need to be postponed till in base station 1 is calling user device again.
Step S505, base station 1 is revised system message by after the information of page notification user device system message modification within the modification cycle of back to back system message, the system message that 1 interior broadcasting is upgraded in the residential quarter.
Secondly, after base station side had been finished and revised the system message of residential quarter 1, subscriber equipment (being in Idle state) needed to receive new system message.Fig. 6 is the schematic flow sheet that obtains system message according to the subscriber equipment of the embodiment of the invention three, and as shown in Figure 6, this flow process can comprise the steps:
Step S601, subscriber equipment judge whether it is the UE that is applicable to EAB.If so, execution in step S602; Otherwise execution in step S604.
Step S602, subscriber equipment judge whether to need to initiate business, set up Radio Resource control (Radio Resource Control, RRC) and connect.If so, execution in step S603; Otherwise execution in step S606.
Step S603, subscriber equipment obtain the EAB parameter in the system message, implement initial access judgement according to the EAB parameter.Only when initial access is adjudicated as permission, just can initiate random access and set up the RRC connection.
Update method according to the present embodiment, at this moment, subscriber equipment need to read the EAB parameter in the new system message, subscriber equipment can be known the dispatching cycle of System information block 2 and the length of window (si-WindowLength) of scheduling by the system message of preserving, subscriber equipment just can be known the accurately gap information of System information block 2, at the time slot read system message piece 2 of correspondence, and then obtain the EAB parameter wherein comprise.
Whether step S604, subscriber equipment receive the call signaling that system message is revised.If so, execution in step S605 then; Otherwise execution in step S606.
Step S605, subscriber equipment obtains new system message in the modification cycle of next system message receiving system message.
Step S606, subscriber equipment is kept Idle state, continues monitoring seek channel.
As seen, in the present embodiment, the EAB parameter in the System information block 2 has been revised in base station 1, does not pass through the information of call signaling notifying user equipment system message alteration, but upgraded immediately new EAB parameter in System information block 2.When the subscriber equipment that is applicable to EAB need to be initiated business and set up RRC and connect (setting up professional reason is Delay Tolerant), need read system message piece 2 to obtain up-to-date EAB parameter, then implement initial access judgement according to new EAB parameter.
Need to prove, the access scale factor (making 0.1 into from 0.8) in the EAB parameter has been revised in the present embodiment because base station 1, and be the EAB parameter of having revised immediately in the System information block 2, the subscriber equipment that is applicable to EAB all needs to obtain new EAB parameter before initiating random access, implement initial access judgement according to the new access scale factor (0.1) that obtains, because the access scale factor is less, 90% subscriber equipment can not be initiated immediately random access and be set up the RRC connection, and can the foundation access scale factor that need to wait for a period of time is again judged initiate random access.Because the access scale factor after revising has been so that 90% access network has immediately reduced random access load and signaling load, so that the load of network side reduces soon.If adopt original system message update mechanism, the information of page notification user device system message modification at first need to be passed through in the modification cycle of first systematic message in base station 1, then send new EAB parameter in the modification cycle of second system message, because the modification cycle of system message is much larger than the dispatching cycle of System information block 2, this will make subscriber equipment (the modification cycle that surpasses a system message) within the quite a long time still use original EAB parameter to implement initial access judgement, will cause the subscriber equipment quantity of access network sharply to increase, cause the load of network side heavier, even reach overload, so that network side can not normally be provided services on the Internet.
Embodiment four
The present embodiment has been described the method for network side modification expansion access control parameter in the UMTS system.Radio network controller (Radio Network Controller is referred to as RNC) is an access network elements in the UMTS system, has administered a plurality of base stations, wherein comprises base station 1,1 administration residential quarter 1, base station.In the system message of residential quarter 1, comprise expansion access control parameter (Extended Access Barring), be used for the UE access network that control is applicable to EAB.
Because the subscriber equipment quantity by residential quarter 1 access network is less, the load of residential quarter 1 is lighter, therefore the EAB parameter that arranges in the system message of residential quarter 1 of RNC is looser, be not Barred such as the access control parameter for all access grade settings in the EAB parameter, like this, if all subscriber equipmenies that are applicable to EAB need to set up and professionally just can initiate immediately random access in the residential quarter 1, after access successfully at random, set up the RAB that transmits for business.
Earthquake has occured in the zone that this moment, residential quarter 1 covered, the subscriber equipment of the One's name is legion after earthquake in 1 coverage of residential quarter is attempted simultaneously access network and is registered, because these subscriber equipmenies have lost state information when earthquake, need again registration in order to can keep communicating by letter with network.Because the subscriber equipment of access network is very many simultaneously, RNC has been known the rapid increase of load of residential quarter 1 by measurement, RNC overload occurs in order to prevent residential quarter 1, determine to revise the EAB parameter of residential quarter 1, for example, the access control parameter for AC 0～AC 8 in the EAB parameter all is revised as Barred, the access control parameter that keeps AC 9 correspondences is not Barred, can make like this 90% UE (being applicable to EAB) can not initiate random access, can effectively reduce the load of network side.
In specific implementation process, RNC finds to only have in the System information block EAB parameter to need to revise, therefore RNC does not pass through the information that call signaling notifying user equipment system message is revised, but the direct EAB parameter of directly revising when next time sending the System information block (such as System information block 3) that comprises the EAB parameter wherein makes the access control parameter for AC 0～AC 8 all be revised as Barred.Secondly, be applicable to the subscriber equipment (setting up professional reason is Delay Tolerant) when needs are initiated business of EAB, need to obtain the EAB parameter in the new system message, subscriber equipment is known the time slot scheduling of the System information block that comprises the EAB parameter by the schedule information of the System information block of preservation, thereby read corresponding System information block constantly and obtain new EAB parameter, then, access grade according to self judges whether to initiate business, if the access grade of subscriber equipment is AC 5, then can not initiate business; If the access grade of subscriber equipment is AC 9, then can initiate business, subscriber equipment will be initiated random access, set up RRC and will connect, and then set up the RAB that is used for transport service.
As seen, in the present embodiment, RNC so that subscriber equipment can obtain new EAB parameter very soon, can carry out access control to subscriber equipment, the overload of having avoided a large amount of access networks of subscriber equipment to cause quickly by revise immediately the EAB parameter in system message.
Need to prove, what be applicable to that the subscriber equipment of EAB usually initiates is the business of time-delay tolerance (delaytolerant) or the business that is called low priority, when the subscriber equipment that is applicable to EAB initiates to delay time tolerate professional, need to obtain the EAB parameter in the system message.The subscriber equipment that is applicable to EAB also can be initiated urgency traffic, and this moment, subscriber equipment did not need to obtain the EAB parameter in the system message, but the access control parameter (ACB) that direct basis is preserved is implemented initial access judgement.
In the present embodiment, RNC finds to only have in the System information block EAB parameter to need to revise, if also have other parameter such as cell ID to need to revise, RNC need to send the information that call signaling notifying user equipment system message is revised.But, RNC still can revise the EAB parameter in the System information block immediately, can obtain as soon as possible new EAB parameter and implement initial access judgement so that be applicable to the subscriber equipment of EAB, so that control is applicable to the load that the subscriber equipment of EAB causes network rapidly.
Embodiment five
A plurality of residential quarters are administered in base station 1 in the LTE system, wherein comprise residential quarter 1.In the system message of residential quarter 1, comprise expansion access control parameter (Extended Access Barring), be used for the UE access network that control is applicable to EAB.Also comprise access control parameter (ACB) in the system message of residential quarter 1 simultaneously, be used for controlling common user access network.
For the random access that makes network side can tackle the subscriber equipment burst is impacted or the signaling impact, keep the network normal operation, introduced the cell of indication network side overload in the system message, after subscriber equipment (being applicable to the subscriber equipment of EAB) is received the cell of indication network side overload, need to stop the service request that current expectation is initiated, keep its idle condition.In the present embodiment, the cell of indication network side overload is in System information block 1.
For example, base station 1 increases suddenly in the random access that detects sometime the subscriber equipment initiation, cause base station 1 can not effectively receive the random access code (because having conflict) of subscriber equipment transmission, base station 1 determines to limit the random access that all subscriber equipmenies that are applicable to EAB are initiated, the cell that base station 1 needs to revise the indication network side overload in the system message makes True into from False.Other configuration parameters in the system message are found not revise (because the configuration parameter in the original system message is preserved in base station 1 in base station 1, when base station 1 needs to revise some configuration parameter in actual motion, can tell which configuration parameter variation has occured), therefore, base station 1 is according to the dispatching cycle of System information block 1, revises the cell of indication network side overload wherein when dispatching patcher message blocks 1 next time.
(no matter this moment is the reason of this user equipment start service Delay Tolerant whether when needs are initiated random access for all subscriber equipmenies that are applicable to EAB, can be other reason such as Client-initiated signaling traffic etc.), need whether the cell of the indication network side overload in the read system message 1 is True, in case it is True that subscriber equipment is known this cell, subscriber equipment just thinks that current residential quarter does not allow access, and subscriber equipment can not be initiated random access.Subscriber equipment maintains Idle state.
In the present embodiment, base station 1 is when detecting random access overload, the cell of the indication network side in the Adjustment System message blocks 1 overload immediately, do not adopt system message update mechanism of the prior art, but directly revise System information block, subscriber equipment can be known the variation of network side load immediately, is conducive to control as soon as possible the random access that subscriber equipment is initiated, and can reduce as soon as possible the load of network side.
In sum, pass through the embodiment of the invention, after the information that is used for sign access overload of Adoption Network side in determining system message changes, in next time scheduling when comprising the System information block of this information, in System information block, use the mode of this information after changing, make network side adjust rapidly the access control parameter for loading condition, and then accelerated the renewal speed of system message, improved validity and the stability of system.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, carried out by calculation element thereby they can be stored in the storage device, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the transmission method of a system message is characterized in that, may further comprise the steps:
Network side determines that the information that is used for sign access overload in the system message changes;
When described network side comprises the System information block of described information for identifying the access overload in next time scheduling, in described System information block, use the described information for identifying the access overload after changing.
2. method according to claim 1, one of it is characterized in that, below described information for identifying the access overload comprises at least: expansion access control EAB parameter, access grade are controlled ACB parameter, random access control parameter, Common Control Channel configuration parameter, are used to indicate the cell of described network side overload.
3. method according to claim 1 is characterized in that, described network side is determined that the described information for sign access overload in the described system message changes and comprised:
When the present load in the residential quarter of described network side changed, described network side determined that the described information for sign access overload in the described system message changes.
4. method according to claim 1 is characterized in that, described network side also comprises before determining that the described information for sign access overload in the described system message changes:
Described network side is according to type and/or the state of the subscriber equipment of access residential quarter, and whether described subscriber equipment is set in described system message needs from the described cell that accesses the information of overload for sign of described network side active obtaining when the access residential quarter.
5. each described method in 4 according to claim 1 is characterized in that, after the described information for sign access overload after described network side uses in described System information block and changes, also comprises:
Subscriber equipment obtains the described information for sign access overload after the described change in the described System information block when the needs initiating business request, and implements initial access judgement according to the described information for sign access overload after the described change.
6. method according to claim 5 is characterized in that, the described information for sign access overload of obtaining after the described change in the described System information block comprises:
The schedule information that described subscriber equipment is preserved by this locality obtains the time slot scheduling of described System information block, and reads described information for sign access overload after the described change according to described time slot scheduling from described System information block.
7. method according to claim 5 is characterized in that, described subscriber equipment is implemented initial access judgement according to the described information for sign access overload after the described change and comprised:
If the court verdict of described initial access judgement is permission, described subscriber equipment is initiated described service request, connect to set up RRC, otherwise described subscriber equipment is not initiated described service request.
8. method according to claim 1 is characterized in that, described network side also comprises after determining that the described information for sign access overload in the described system message changes:
Described network side is not notified the change of the described system message of described subscriber equipment by call signaling.
9. the transmission network element of a system message is characterized in that, comprising:
Determination module is used for determining that the information that is used for sign access overload of system message changes;
Scheduler module is used for when next time scheduling comprises the System information block of described information for identifying the access overload, uses the described information for identifying the access overload after changing in described System information block.
10. network element according to claim 9 is characterized in that, described network element is evolution base station in the Long Term Evolution LTE system or the radio network controller among the universal mobile telecommunications system UMTS.
11. the transmission system of a system message is characterized in that, comprises subscriber equipment and claim 9 or 10 described network elements, wherein, described subscriber equipment comprises:
Acquisition module is used for when the needs initiating business request, obtains from the described information for sign access overload after the described change in the described System information block of described network element;
Judge module, the described information for sign access overload after the described change that is used for obtaining according to described acquisition module is implemented initial access judgement.
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