CN101052225A - Processing method for call abnormal situation - Google Patents

Abstract

The method comprises: after UE establishes the RRC connection and enters into CELL-FACH state, it sends the call CONFIRM message to network; after a while, if the call connection can't be kept (namely the connection is successful or failure), UE release the RRC connection to avoid the UE keeps in CELL-FACH state and doesn't release the RRC connection so as to improve the UE stability. The invention sets up a timer on CC layer at network side, after the UE sends the CALL CONFIM message, the timer is opened, and after the CC layer enters other state except the call received state, the timer is stopped; after the timer is overtime, the RRC connection is released; returning to idle state.

Description

A kind of processing method of call abnormal situation

Technical field

The present invention relates to a kind of processing method of call abnormal situation, particularly a kind of 3G (Third Generation) Moblie user terminal (being called for short UE) is to the processing method of call abnormal situation.

Background technology

In 3-G (Generation Three mobile communication system), the call management functionality in circuit switching (abbreviating CS as) territory is mainly finished in calling control (the abbreviating CC as) sublayer that is in connection management (the abbreviating CM as) layer, is the core of whole C M layer.According to whether having set up Radio Resource control connection (abbreviating RRC as connects), UE can be in idle pulley or connection mode respectively.4 kinds of different states are arranged when UE is in connection mode, be respectively: CELL_DCH state, CELL_FACH state, CELL_PCH state and URA_PCH state.And when UE is in the CELL_FACH state of connection mode, do not exist DPCH to be connected between UE and the UTRAN (UMTS Terrestrial radio access network), UE at down direction with continuous monitoring FACH (forward access channel), and can use public or shared channel (as RACH, Random Access Channel) at up direction.Therefore, the CELL_FACH state does not have the same/detection of loss of mains mechanism of CELL_DCH state.

When UE is called, at first initiate RRC and connect the process of setting up, if network requirement UE enters the CELL_FACH state, UE is after having sent call confirmation message (being called CALL CONFIRMED message) so, to wait for that network side initiates radio bearer and set up process, after radio bearer is set up successfully, UE will be from CELL_FACH transition between states to the CELL_DCH state, and send ALERTING message (being called ALERTING message) and offhook message (being called CONNECT message) thereupon, after the off-hook acknowledge message of receiving network side (being called CONNECT ACKNOWLEDGE message), access success.If do not have success or other reasons because radio bearer is set up, network side will send RRC connection release message (being called RRC CONNECTION RELEASE message), notice UE discharges RRC and connects, come back to idle pulley, this situation will cause call failure, and this time RRC connects and will be released.Obviously, if because some reason, UE does not receive the radio bearer of network side transmission and sets up message (being called RADIO BEARERSETUP message) or RRC connection release message etc., to cause calling out and to proceed, UE will keep the CELL_FACH state, at this moment, because UE does not have timer to continue this calling procedure of monitoring, and there are not reasons such as detection of loss of mains mechanism yet, to finally cause this called process successfully not set up, and initiatively can't not discharge calling this time under the situation of on-hook at UE.

Summary of the invention

The present invention proposes the processing method of a kind of UE to call exception, guarantee UE RRC connect set up successfully enter the CELL_FACH state after, if can not proceed (being successful connection or failure) having sent to network after the CALL CONFIRMED message to call out in a period of time to connect, UE discharges RRC with this locality and connects, avoid UE to be in the CELL_FACH state always and can't discharge this RRC connecting and this time calling out, greatly improved the stability of UE.

Processing method of the present invention is provided with a timer (abbreviating Timer as) at the CC of UE side layer, when being called out, UE sent opening timing device Timer after the CALL CONFIRM message, when entering other states except that call out receiving (abbreviating call received as), the CC layer stops timer Timer, and at the overtime back release of timer Timer RRC connection, returning to idle mode.

Processing method of the present invention can define as required at the title and the timing (being called the cycle again) of the timer that the CC of UE side layer is provided with, and its cycle can be defined as 30 seconds-60 seconds usually.

Processing method of the present invention compared with prior art, by increasing the timer of a CC layer, with monitoring transmission the calling procedure after the CALL CONFIRMED message, avoid the phenomenon that (the particularly abnormal conditions under the CELL_FACH state) UE can't discharge this RRC connection and this time call out under abnormal conditions, greatly improved the stability of UE.

Description of drawings

The schematic diagram of UE and network side interacting message in the called process in the normal CS of Fig. 1 prior art territory (early assigning);

The schematic diagram of UE and network side interacting message under the called process exception situation in Fig. 2 prior art CS territory;

The schematic diagram of Fig. 3 processing method embodiment of the present invention UE and network side interacting message under call abnormal situation.

Below in conjunction with accompanying drawing call abnormal situation processing method of the present invention is further described.

Accompanying drawing 1 is the schematic diagram of middle UE of the called process in the normal CS of prior art territory (early assigning) and network side interacting message.So-called " early assigning " is meant network side after receiving CALL CONFIRMED message, can initiate the process that radio bearer is set up immediately.As seen from the figure, after radio bearer is set up successfully, UE will send ALERTING message and CONNECT message, after the CONNECTACKNOWLEDGE message of receiving automatic network, and access success, calling both sides can be carried out normal talking.

Accompanying drawing 2 is schematic diagrames of UE and network side interacting message under the called process exception situation in prior art CS territory.As seen from the figure, when UE does not receive the radio bearer of automatic network to set up message or RRC connection release message, will be in the CELL_FACH state always, and can't discharge this time and call out.

Accompanying drawing 3 is schematic diagrames of processing method embodiment of the present invention UE and network side interacting message under call abnormal situation.Fig. 3 (A) be processing method embodiment of the present invention under call abnormal situation, the local RRC of release in the overtime back of timer Timer connects the schematic diagram of returning to idle mode.Fig. 3 (B) be processing method embodiment of the present invention when the CC layer enters other states, stop the schematic diagram of timer Timer.

By Fig. 3 (A) and Fig. 3 (B) as can be known, processing method embodiment of the present invention may further comprise the steps:

1, at the CC of UE side layer timer T_callCnf (30 seconds cycles) is set, has sent when called to monitor to call out after the CALL CONFIRMED message and whether normally carried out;

2, after the CC layer sends CALL CONFIRMED message, open T_callCnf, and enter called confirmation (being called mobile terminating call confirmed) state;

3, after the CC layer enters other states except that call out receiving " call received ", promptly stop T_callCnf;

4, the overtime back of T_callCnf UE discharges this time and calls out, and the local RRC of release of CC layer connects, and enters " null " (sky) state.

In this embodiment, other state of entering except that call out receiving " call received " of UE side CC layer comprise:

1. called process is normally carried out, and the CC layer will send CONNECT message, and opening timing device T313 enters connection request (being called connect request) state;

2. initiatively on-hook of UE, the CC layer will send disconnection (being called DISCONNECT) message, and opening timing device T305 enters disconnection request (being called disconnect request) state;

3. the CC layer has been received release (being called DISCONNECT, RELEASE) or has been discharged and finished (being called RELEASE COMPLETE) message, and the CC layer will enter " null " state or open T308 and enter request (the being called release request) state that discharges.

The inventive method also can have other various embodiments; without departing from the spirit and substance of the case in the method for the present invention; those skilled in the art work as can make various corresponding changes or distortion according to the inventive method, but these corresponding changes or distortion all belong to the claim protection range of the inventive method.

Claims (3)

1, a kind of UE is to the processing method of call abnormal situation, it is characterized in that: a timer (abbreviating Timer as) is set at the CC of UE side layer, when being called out, UE sent opening timing device Timer after the CALL CONFIRM message, when entering other states except that call out receiving (abbreviating call received as), the CC layer stops timer Timer, and at the overtime back release of timer Timer RRC connection, returning to idle mode.

2, according to the described processing method of claim 1, it is characterized in that the title and the timing (being called the cycle again) of the timer that is provided with at the CC of UE side layer can define as required, its cycle can be defined as 30 seconds-60 seconds usually.

3,, it is characterized in that other states that UE side CC layer enters except that calling out reception comprise according to the described processing method of claim 1:

1. called process is normally carried out, and the CC layer will send CONNECT message, and opening timing device T313 enters connection request (being called connect request) state;

2. initiatively on-hook of UE, the CC layer will send disconnection (being called DISCONNECT) message, and opening timing device T305 enters disconnection request (being called disconnect request) state;

3. the CC layer has been received release (being called DISCONNECT, RELEASE) or has been discharged and finished (being called RELEASE COMPLETE) message, and the CC layer will enter " null " state or open T308 and enter request (the being called release request) state that discharges.

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