A kind of IU of preventing interface signaling connects the method for hanging
Technical field
The present invention relates to moving communicating field, refer to that especially a kind of IU of preventing interface signaling connects the method for hanging.
Background technology
In mobile communication system, the interface between core net (CN, Core Network) and the radio network controller (RNC, Radio Network Controller) is called the IU interface.Subscriber equipment (UE, User Equipment) to obtain communication service, just must set up Radio Resource control (RRC) earlier and connect, and after RRC connection foundation is finished, pass through initial business of (Initial DirectTransfer) process initiation of directly transmitting of Uu interface.After RNC receives Initial Direct Transfer message, " initial user message (Initial UE Message) " flow process by RANAP connects for the IU interface signaling that this UE sets up between CN and the RNC, the IU interface signaling that CN passes through to be set up connects and RNC carries out alternately, and after this CN can carry out the business foundation of UE by the RAB ASSIGNMENT REQUEST process of IU interface.
When the business of certain UE stopped, the IU interface signaling of setting up for this UE connected and is in the idle state that neither utilizations also do not discharge, and RNC also is in idle state for the RRC connection that this UE sets up simultaneously, and promptly described IU interface signaling connection is hung.This IU interface signaling connects hangs the serious waste that can cause interface-free resources and IU interface resource.
For preventing that the IU interface signaling from connecting the situation of hanging and taking place, CN can initiate " IU discharges (IURelease) " flow process and discharge the connection of IU interface signaling." IU Release " flow process is specific as follows: CN sends IU release command (IU RELEASE COMMAND) message to RNC, requires RNC to discharge described UE and connects at the IU interface signaling of the circuit commutative field (CS) or the packet-switched domain domains of dependence such as (PS).After RNC receives message, discharge described IU interface signaling and connect, reply IU release then and finish (IU RELEASE COMPLETE) message, if all territories all do not have the IU interface signaling to connect afterwards, then the corresponding RRC of RNC release connects.
Owing to may have following abnormal conditions in the communication process: one, do not have under the professional situation at certain UE, CN does not initiatively discharge this professional IU interface signaling connection; Two, the information drop-out that connects of the CN release IU interface signaling of initiatively initiating.The method that these abnormal conditions will make the above-mentioned IU of preventing interface signaling connect and hang lost efficacy, and still can be hung unusually so the IU interface signaling connects, thereby the capacity and the performance of reduction system caused serious consequence.
For preventing the appearance of above-mentioned abnormal conditions, timer is set on RNC.When detecting, RNC starts this timer when certain UE does not have business, if this UE initiates new business then the timeing closing device before timer expiry; Do not need to send if this UE still has professional data behind the timer expiry, RNC initiatively initiates cause value IU release request (IU Release Request) flow process for " user's inertia (user inactivity) ", connects in order to the IU interface signaling that discharges this UE.
But, prevent under this abnormal conditions that the IU interface signaling from connecting the method for hanging and having following shortcoming:
(1) very not identical with 25.413 agreements.When certain UE was in no professional state, RNC initiated IU Release Request flow process, and cause value is set to " user inactivity ".Yet the user inactivity that stipulates in the agreement is meant that one or more non-real-time services are inactive, but not does not have professional state.
(2) " continuing (Follow on) " disabler that may cause agreement to be stipulated.23.060 and 24.008 agreements regulation: if UE has Follow-on Request cell in location update message, and cell parameters is " Follow-on request pending ", then CN starts the T3255 timer, before the T3255 timer expiry, even this UE does not have business, CN also need keep the IU interface signaling of this UE to connect, and makes later RAB (RAB) can be based upon existing IU interface signaling and connects.Only behind the T3255 timer expiry, the IU interface signaling that CN could discharge this UE connects.If the timer length that RNC is provided with is less than the T3255 timer of CN, the IURelease Request flow process that RNC initiatively initiates will just discharge the IU interface signaling and connect before the T3255 timer expiry, thereby makes " Follow on " disabler of this UE.
In order to prevent that " Follow on " disabler phenomenon from taking place, RNC need could correctly be provided with timer length after consulting with CN.Owing to have a plurality of CN nodes in the whole communication system, RNC needs and all CN nodes are consulted.For communication system, too much data agreement must make the network planning and data configuration too complicated between the distinct device, therefore needs a better method to solve above-mentioned variety of problems.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of IU of preventing interface signaling to connect the method for hanging, and prevents that farthest system resource is idle, guarantees that the optimization of system resource is used.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of IU of preventing interface signaling connects the method for hanging, and it is characterized in that this method may further comprise the steps:
When a, radio network controller detect subscriber equipment and are in no business sheet signaling, the timing of state when starting no business sheet signaling;
B, radio network controller judge whether subscriber equipment has new business to take place in the timing length of setting, if have then return execution in step a, the Radio Resource control connection of described subscriber equipment is moved to the state that lacks than the current state resource occupation from current state otherwise radio network controller carries out an at least state transition.
Further, the method of the described state transition of step b is: radio network controller sends the message of carrying the RRC status cell to subscriber equipment, RRC status cell in the message is set to the state that lacks than the current state resource occupation, and subscriber equipment is configured to the described state that lacks than the current state resource occupation according to the RRC status cell with the Radio Resource control connection.
Preferably, described message of carrying the RRC status cell is radio bearer reconfiguration message, perhaps is the transmission channel reconfiguration message.
Further, radio network controller is provided with a regularly length for each state, and the described method that the Radio Resource control connection is moved to the state that lacks than the current state resource occupation of step b is:
B1, radio network controller are moved to the next stage state that lacks than the current state resource occupation with the Radio Resource control connection from current state, and start the state timing of next stage state;
B2, radio network controller judge whether subscriber equipment has new business to take place in the timing length of the described next stage state of step b1, if having then return execution in step a; Otherwise judge whether and to move to take resource state still less than current state, then return execution in step b1 if desired, otherwise process ends.
Further, described user is the CELL_DCH state when being in no business sheet signaling, and then the described method that the Radio Resource control connection is moved to the state that lacks than the current state resource occupation of step b is:
B11, radio network controller are moved to the CELL_FACH state with the Radio Resource control connection of described subscriber equipment, and start the state timing of CELL_FACH state;
B12, radio network controller judge whether subscriber equipment has new business to take place in the timing length of CELL_FACH setting state, if have then return execution in step a, otherwise radio network controller is moved to the CELL_PCH state with the Radio Resource control connection of described subscriber equipment.
Further, described user is the CELL_DCH state when being in no business sheet signaling, the described method of carrying out state transition of step b is: radio network controller is once moved to the CELL_FACH state with the Radio Resource control connection of described subscriber equipment, perhaps move to the CELL_PCH state, perhaps move to the URA_PCH state.
Further, described user is the CELL_FACH state when being in no business sheet signaling, the described method of carrying out state transition of step b is: radio network controller is once moved to the CELL_PCH state with the Radio Resource control connection of described subscriber equipment, perhaps moves to the URA_PCH state.
Further, described user is the CELL_PCH state when being in no business sheet signaling, and the described method that the Radio Resource control connection is moved to the state that lacks than the current state resource occupation of step b is:
After b21, radio network controller are received the cell update message that subscriber equipment sends, reply cell update to described subscriber equipment and finish message, the RRC status cell that cell update is finished in the message is set to the URA_PCH state;
B22, subscriber equipment are configured to the URA_PCH state according to the RRC status cell with the Radio Resource control connection.
Further, this method further comprises after the step b: radio network controller judges whether self arrives the system resource congestion threshold, if arrive then from all subscriber equipmenies, select no business sheet signaling and currently be in the subscriber equipment that resource is occupied minimum state, and remove the IU interface signaling connection of selected subscriber equipment.
Preferably, the method for described selection subscriber equipment is: radio network controller selects to be in the longest subscriber equipment of time that described resource is occupied minimum state.
As seen from the above technical solution, this IU of preventing interface signaling of the present invention connects the method for hanging and carries out state transition by the shared RRC of no business sheet signaling UE is connected, make it reduce taking gradually to system resource, avoiding keeping signaling to connect with minimum resource under the idle situation of system resource, it is forever online that the UE that does not have business is accomplished as much as possible, thereby the optimization that realizes system resource is used.
This method can also be under the situation of system resource extreme congestion, initiatively discharges unnecessary IU interface signaling by RNC and connects and alleviate system pressure.Only under extreme case, be released because the IU interface signaling connects, thereby guarantee that to the full extent " Follow on " function did not lose efficacy.
Description of drawings
Fig. 1 is the state transition schematic diagram between idle pulley and the UTRAN RRC connection mode in the existing protocol;
Fig. 2 connects the method flow diagram of hanging for preventing the IU interface signaling in a preferred embodiment of the present invention.
Embodiment
The core concept of the inventive method is: at first, when radio network controller detects subscriber equipment and is in no business sheet signaling, and the timing of state when starting no business sheet signaling; Then, radio network controller judges whether subscriber equipment has new business to take place in the timing length of setting, if have then return the execution first step, otherwise radio network controller is carried out a state transition, and the Radio Resource control connection is moved to the next stage state that lacks than the current state resource occupation from current state; Then, radio network controller starts the state timing of next stage state, and judge whether subscriber equipment has new business to take place in the timing length of described next stage state, if have then return the execution first step, otherwise radio network controller takies situation according to system resource or planning in advance judges whether that needs move to take resource state still less than current state, then carry out the succeeding state transition process if desired, otherwise process ends.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
According to 25.331 agreements regulation, Fig. 1 carries out state transition for UE between idle pulley (Idle Mode) 101 and UTRANRRC connection mode (UTRAN RRC Connected Mode) schematic diagram.The UE that is in UTRAN RRC connection mode comprises following four kinds of states, is respectively: CELL_DCH state 102, CELL_FACH state 103, CELL_PCH state 104 and URA_PCH state 105.
The agreement regulation: UE can enter CELL_DCH state 102 or CELL_FACH state 103 from the idle condition 101 of Call Waiting the sub-district, can also return idle condition 101 from CELL_DCH state 102 or CELL_FACH state 103;
When UE is in CELL_DCH state 102, can enter CELL_FACH state 103, CELL_PCH state 104 or URA_PCH state 105 by state transition, can also return CELL_DCH state 102 from CELL_FACH state 103;
When UE is in CELL_FACH state 103, can enter CELL_PCH state 104 or URA_PCH state 105 by state transition, can also return CELL_FACH state 103 from CELL_PCH state 104 or URA_PCH state 105.
From the angle of resource occupation, the UE that is in CELL_DCH state 102 takies dedicated channel and carries out the big data quantity transmission, so resource occupation is maximum; What be in that the UE of CELL_FACH state 103 uses is common signal channel in the sub-district, because common signal channel shared by all UE in the sub-district, so single UE can only utilize common signal channel to carry out the small amount of data transmission, so resource occupation lacks than CELL_DCH state 102; The UE that is in CELL_PCH state 104 or URA_PCH state 105 can't carry out transfer of data, can only listening paging channel (PCH), and at the UTRAN Acceditation Area (URA) at sub-district at UE place (CELL) or UE place when changing, by return CELL_FACH state 103 send cell update message (CELL UPDATE) or URA updating message (URAUPDATE) to network side report UE current resident CELL or URA, so resource occupation is still less.Because URA_PCH state 105 definition is UE just reports the UE position when mobile to network side between URA more new situation, and each URA can comprise one or more CELL, so the Signalling exchange that is in the UE of URA_PCH state 105 and network side than CELL_PCH state 104 still less, promptly the resource occupation of URA_PCH state 105 is minimum.
Based on state transition schematic diagram shown in Figure 1, suppose that when UE is in no business sheet signaling situation be CELL_DCH state 102, RNC sets in advance timer T1 and timer T2, the timing length of these two timers can be set according to actual needs, adjust, prevent in a preferred embodiment of the present invention that the IU interface signaling from connecting the method hang as shown in Figure 2, may further comprise the steps:
Step 201, RNC detect and start timer T1 when UE is in the situation of no business sheet signaling.
Described no business sheet signaling is meant that UE only sets up signaling and connects the professional situation about connecting of but setting up as yet when initial access network, and perhaps UE removes the professional situation that but keeps the signaling connection that connects in business termination back.
Step 202, RNC judge whether UE initiates new business before timer T1 is overtime, if timeing closing device T1 and return execution in step 201 then, otherwise execution in step 203.
Step 203, RNC keep the IU interface signaling of this UE to connect and by state transition the Radio Resource of this UE are controlled (RRC) connection changing to CELL_FACH state 103 from CELL_DCH state 102.
In this step, because the overtime preceding UE of timer T1 does not initiate new business, so UE still is in the situation of no business sheet signaling when timer T1 is overtime.
3GPP TS 25331 agreements regulation all has RRC status (RRC STATE) cell in radio bearer reconfiguration message (RADIO BEARERRECONFIGURATION) or the transmission channel reconfiguration message (TRANSPORT CHANNELRECONFIGURATION).In this step, RNC can be set to CELL_FACH and initiates state transition by sending arbitrary message in above-mentioned two message and RRC STATE cell, after UE receives message, the RRC connection is changed to the CELL_FACH state from present located CELL_DCH state according to being provided with of RRCSTATE cell.
Step 204, RNC start timer T2 and also judge whether UE initiates new business before timer T2 is overtime, if timeing closing device T2 and return execution in step 201 then, otherwise execution in step 205.
Step 205, RNC connect the RRC of this UE by state transition and change to CELL_PCH state 104 from CELL_FACH state 103, thereby reduce this UE taking system resource.
In this step, the RRC STATE cell in RNC RADIO BEARER RECONFIGURATION message or the TRANSPORT CHANNEL RECONFIGURATION message is set to CELL_PCH, and sends a message to UE.After UE receives message, with RRC connection becoming CELL_PCH state 104.
By method shown in Figure 2, RNC progressively reduces not have business sheet signaling UE taking system resource through twice state transition.Above-described method only is preferred embodiment of the present invention, in actual applications, when RNC detects UE and is in no business sheet signaling, can according to the occupation condition of whole system and system needs decision for UE carry out state transition several times and the most at last the RRC of UE be connected the few state of which resource occupation of moving to.When being in no business sheet signaling situation such as: UE is CELL_DCH state 102, and RNC only is provided with a timer, and directly the RRC of UE is connected behind this timer expiry and change to CELL_PCH state 104 from CELL_DCH state 102; Perhaps, after RNC changes to CELL_FACH state 103 with the RRC connection from CELL_DCH state 102, no longer RRC is connected and carry out state transition.For another example: UE is a CELL_FACH state 103 when being in no business sheet signaling situation, RNC is provided with a timer and monitors that UE is in the time of CELL_FACH state 103, if this timer expiry, RNC directly change to CELL_PCH state 104 with the RRC connection of UE from CELL_FACH state 103.
As can be seen from Figure 1, RNC can also be provided with a timer and monitor that UE is in the time of CELL_DCH state 102 or CELL_FACH state 103, and behind timer expiry, the RRC connection of no business sheet signaling UE is changed to URA_PCH state 105 from CELL_DCH state 102 or CELL_FACH state 103, thereby in the IU interface signaling connection that keeps no business sheet signaling UE, conserve system resources more.
Connect the situation that is in the CELL_PCH state for RRC, because UE needs periodically by its present located position of CELL UPDATE process informing network side in the prior art, so when UE carries out CELL UPDATE process, UE becomes the CELL_FACH state from the CELL_PCH state, utilizes the common signal channel of sub-district to send CELL UPDATE message to RNC.After RNC receives CELLUPDATE message, send CELL UPDATE CONFIRM message to UE, indication UE turns back to the CELL_PCH state.
When the RRC connection is in the CELL_PCH state, owing to do not have the path that changes to the URA_PCH state from the CELL_PCH state in the state transition schematic diagram shown in Figure 1, so UE can't directly migrate to occupying system resources URA_PCH state still less.For realizing migration from the CELL_PCH state to the URA_PCH state, can utilize the CELL_FACH state to carry out transfer, concrete grammar is as follows:
1, UE begins to carry out CELL UPDATE process, becomes the CELL_FACH state from the CELL_PCH state, sends cell update message (CELL UPDATE) to RNC.
2, after RNC receives CELL UPDATE message, send cell update to UE and finish message (CELL UPDATE CONFIRM), and the RRC STATE cell in the message is set to URA_PCH.
3, after UE receives message, enter the URA_PCH state according to the indication of RRC STATE cell.
Find out that from above-mentioned explanation RNC can be provided with a timer respectively for every kind of state, when UE arrived certain state, corresponding timer started timing and monitors the residence time of UE at described state.Only behind the timer expiry of certain state, RNC just with UE from described state transition to next stage resource occupation state still less, and start the timer of next stage state correspondence.
RNC can also only be provided with a timer, when arriving certain state, UE starts the timer timing, behind timer expiry, close this timer executing state migration, with UE from described state transition to next stage resource occupation state still less, and when UE arrives the next stage state, start the timer timing once more.
Further, RNC judges whether self arrives the system resource congestion threshold, if arrive then can connect and completely abolish this subscriber equipment taking by discharging one or more IU interface signaling that is in CELL_PCH state or URA_PCH state UE to system resource, to alleviate system pressure,, RNC connects otherwise needn't discharging the IU interface signaling of any one UE.
When selecting to wait to discharge the connection of IU interface signaling, can adopt the algorithm of first in first out, preferentially discharge no business sheet signaling and enter the CELL_PCH state the earliest or the connection of the IU interface signaling of the UE of URA_PCH state, thereby guarantee that to the full extent " Follow on " function did not lose efficacy.
By the above embodiments as seen, this IU of preventing interface signaling of the present invention connects the method for hanging makes no business sheet signaling UE reduce taking system resource gradually by state transition, it is forever online under the situation of avoiding system resource to leave unused the UE that does not have business to be accomplished as much as possible, thereby the optimization that realizes system resource is used.