CN101175319B - Method for switch-over between new and old configuration of wireless network controller - Google Patents

Abstract

The present invention provides a wireless network controller-side new-old configuration switching method. The steps are as follows: (1) in the transient process of the new-old configuration, the user plane of the wireless network controller RNC sends and receives the data on the old configuration and waits for waiting the data on the new configuration. (2) If an effective data received on the new configuration is detected by the user plane, the switching is started and all protocol layers, which are waiting to be switched, are switched to the new configuration by the user plane. According to the method in the present invention, a RRC can automatically switch to the new configuration in the transient process of the new-old configuration switching; so the switching mission success rate is increased; the call drops are reduced and the stability and reliability of the system are enhanced.

Description

Method for switching new and old configuration at wireless network controller side

Technical Field

The present invention relates to a third generation mobile communication System, and more particularly, to a method for processing channel type switching or hard switching of a WCDMA (Wide-band Code Division Multiple Access System) air interface protocol media Access control layer mac (medium Access control) and a radio Resource control protocol rrc (radio Resource control).

Background

In the WCDMA system, the radio resource control layer RRC of the UTRAN is responsible for radio resource allocation and management, and mobility management work of the UE on the radio access side, as shown in fig. 1. When the RRC of the UTRAN determines to configure or modify the radio resources of the UE, a downlink RRC message, such as radio bearer establishment, radio bearer reconfiguration, physical channel reconfiguration, etc., is sent to the UE through the user plane protocol radio link control layer RLC and the medium access control layer MAC, and at the same time, the radio resources related to the UE in the UTRAN are established or modified, as shown in fig. 2. These messages are specified in the protocol 3GPP 25.331 V6.1.0(3GPP is an international organization known as the "third generation partnership project") to be sent over dedicated control channels DCCH in acknowledged mode rlc (am rlc) or unacknowledged mode rlc (um rlc).

If AM RLC is used for sending, after RLC of UTRAN sends message, it generally needs to wait for ACK response of UE RLC, and confirms that message has been received by UE, after RRC of UE receives message, according to effective mode of new configuration configured by UTRAN, after new configuration takes effect, it sends complete message to UTRAN.

The new configuration validation mode mainly has two modes, namely immediate validation or validation at a specified time (synchronous validation). In the synchronous effective mode, the UTRAN and the UE are switched to the new configuration at the same time; if the configuration information is in effect immediately, the UE immediately switches to the new configuration after receiving the complete configuration information and sends a configuration effect completion information, and the UTRAN switches to the new configuration after receiving the completion information. At this time, after the UTRAN sends the configuration message, the data sent on the old configuration can be received on both the old and new configurations of UTRAN layer 2. This approach has the following:

the RRC state of the UE is switched from a CELL _ DCH state to a CELL _ FACH state; wherein,

the CELL _ DCH state is a state in which the mobile station performs a communication process using a dedicated channel;

the Cell _ FACH state is a state in which the mobile station completes transmission of a small amount of data without allocating a dedicated channel, and downlink data transmits messages on a common FACH channel;

2. hard handover, protocol 3GPP 25.321 V6.1.0 and the new and old configuration handover in 3GPP 25.331 V6.1.0 are both RRC initiated. If the radio network controller RNC of the UTRAN does not receive the completion message due to the quality of the air interface after the UE is switched to the new configuration, and the UE subsequently sends another message on the logical channel for sending the completion message, in this case, even if the RNC receives the second message, the UE cannot receive the AM RLC status report sent by the RNC because the downlink transmission is sent on the old configuration, so that the UE cannot retransmit the completion message all the time, and finally the procedure fails, resulting in a call drop.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method for switching new and old configurations at a radio network controller side, which can switch states in time according to actual conditions, avoid the defect that the AM RLC at the two ends of the RNC and the UE cannot effectively report the states in a transient process, improve the success rate of switching, and reduce the call drop rate.

In order to solve the above problems, the present invention provides a method for performing new and old configuration switching at a radio network controller side, which is applied to channel type switching or hard switching, and comprises the following steps:

(1) when the new configuration and the old configuration exist at the same time but the new configuration and the old configuration are not switched, a user of the radio network controller RNC sends and receives data on the old configuration and waits for receiving the data on the new configuration;

(2) if the user plane detects that the effective data is received on the new configuration, the user plane starts switching and switches all protocol layers to be switched to the new configuration; the effective data is uplink data of User Equipment (UE).

Wherein the step (2) may further include: if the user plane detects that the effective data is received on the new configuration, the user plane transmits the received effective data to an upper layer; the upper layer refers to a radio resource controller RRC.

Wherein the step (2) may further include: and if the user plane does not receive the new configuration data, returning to the step (1) to continue waiting for receiving.

Wherein, the method also has the following characteristics:

(3) if the user plane receives a switching command of a Radio Resource Controller (RRC), judging whether the user plane performs switching or not, and if the switching is completed, not processing the switching command; and if the user plane does not switch, switching between the new configuration and the old configuration according to the switching command.

Compared with the prior art, when the method is in the transient process of switching the new configuration and the old configuration, once the user receives the uplink data of the UE, the UE is considered to be switched to the new configuration, and then the RRC is automatically switched to the new configuration. Therefore, the switching success rate is improved, the occurrence of the call drop phenomenon is reduced, and the stability and the reliability of the system are improved.

Drawings

Fig. 1 is a schematic diagram of prior art WCDMA air interface protocol layers.

Figure 2 is a prior art UE handover from CELL DCH to CELL FACH embodiment.

Fig. 3 is a flow chart of a handover of a UE from CELL DCH to CELL FACH in an embodiment.

Figure 4 is an embodiment of the UE handover from CELL DCH to CELL FACH according to the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 2 is a prior art UE switching from CELL DCH to CELL FACH as an example, and describes a UE state switching process from CELL DCH to CELL FACH under a certain radio configuration (including RLC configuration and triggering manner of UE measurement report), including the following steps:

step 201-202, configuring information by a user plane;

the RRC configures a channel mapping relation for a user plane of the RNC, after configuration, the user plane sends data to NODE B under CELL _ DCH, and receives uplink data of the UE on DCH and FACH simultaneously;

the Node B is interconnected with RNC through standard Iub interface, and communicates with UE through Uu interface, mainly completes the process of Uu interface physical layer protocol and Iub interface protocol.

Step 203, radio bearer RB configuration message (DCH/DCCH) RLC DL SN ═ 1;

the RRC sends a radio bearer RB configuration message to the UE through the user plane, an RLC layer of the user plane segments the message, the message is supposed to be divided into 3 radio link control layer packet data packets RLC PDU which are sent to the UE through a bottom layer, and the RLC fills a Polling bit in the last packet of SN (equal to 3) data according to the configuration of the AM RLC, and the UE is required to return a status report of the RLC after receiving the Polling bit.

Step 204, radio bearer RB configuration message (DCH/DCCH) RLC DL SN ═ 2;

step 205, radio bearer RB configuration message (DCH/DCCH) RLC DL SN ═ 3 (Polling);

step 206, STATUS report (DCH/DCCH) RLC STATUS (ACK DL SN ═ 4);

after receiving the RB configuration message, the UE sends a status report to the RNC indicating that 3 packets of data have been received.

Step 207-208, configuring information;

and the UE restores the 3 PDUs into RB configuration messages and sends the RB configuration messages to an RRC layer of the UE, and the RRC configures a new mapping relation for the user plane of the UE according to the RB configuration contents and switches to a public channel state.

Step 209, configure complete message (RACH/DCCH) RLC UL SN ═ 1 (Polling);

the RRC layer of the UE sends an RB configuration completion message to the UTRAN on an uplink common channel or an uplink shared transport channel RACH, the RLC of the UE forms the message into a PDU to be sent to the RNC, wherein SN is 1, and a Polling bit is filled in to require the RLC of the RNC to return a status report. Due to the quality problem of an air interface, the RLC layer of the RNC cannot receive the RB configuration completion message;

step 210, a measurement report (RACH/DCCH) RLC UL SN ═ 2 (Polling);

the UE sends a measurement report on the same AM RLC, the RLC forms a PDU with SN 2 to the RNC, and according to the configuration of the AM RLC, Polling of this PDU is set, which indicates that a status report of the RNC's RLC is needed.

Step 211, Status report (DCH/DCCH) RLC Status (UL SN ═ 1 Lost);

and the RLC of the RNC transmits a status report to request the UE to retransmit the configuration completion message, and after receiving the uplink data with SN 2, the RLC of the RNC informs the UE, and the RNC does not receive the data with SN 1 and requests the UE to retransmit. Since the user plane of the RNC is not switched to the FACH state, the status report of the RNC is sent on the DCH and therefore cannot be received by the UE.

Step 212, call drop.

The UE does not receive the status report of the RLC of the RNC, and retransmits the data with SN 2 until the unrecoverable error of the RLC occurs, and the call is dropped after the status report is reported to the RRC.

In the hard handover, after the UE is handed over to the new configuration, due to the quality of an air interface, the RNC of the radio network controller of the UTRAN does not receive the completion message, and the UE subsequently sends another message on the logical channel for sending the completion message.

Fig. 3 depicts the state handover procedure of the method of the present invention from DCH to FACH. Judging at the MAC layer of the RNC, if receiving valid data newly configured by the UE, the user plane of the RNC performs a handover by itself, so that after receiving the data with SN of 2, the RLC of the RNC sends a status report with SN of 1 lost to the UE, which can be sent to the UE on the FACH, the UE can receive and retransmit the RB configuration completion message, and the RRC of the RNC can also receive the message. The method comprises the following steps:

step 301, in the transient process of the new and old configurations, the user plane (MAC and FP) of the RNC sends and receives data on the old configuration, and waits for receiving data on the new configuration or an RRC handover message;

step 302, if the user plane detects that valid data is received on the new configuration, the user plane transmits the data to an upper layer, and then step 303 is executed; if the new configuration data is not received, turning to step 301, continuing to wait for reception;

here, the uplink data of the UE may be considered as valid data.

Step 303, the user plane starts switching, and all protocol layers to be switched are switched to the new configuration;

then, after the switching is completed, the user plane receives the switching message of RRC, the user plane judges whether the user plane is switched, if so, the user plane does not process; and if the user plane judges that the user plane does not switch, executing switching operation on the user plane.

Fig. 4 is an embodiment of the UE switching from CELL DCH to CELL FACH according to the present invention, which describes an embodiment of the UE state switching process from CELL DCH to CELL FACH according to the present invention, and includes the following steps:

steps 401 to 410 are respectively the same as steps 201 to 210 in FIG. 2;

step 411, the user plane is switched to CELL _ FACH state;

and the RNC judges on the MAC layer, and if the effective data on the new configuration of the UE is received, the user plane of the RNC is switched by self.

Step 412, (FACH/DCCH) RLC Status (UL SN 1 Lost);

the RNC sends a status report with SN 1 lost to the UE on FACH.

Step 413, (RACH/DCCH) RLC Retran UL SN ═ 1 (Polling);

the UE receives the status report and retransmits the RB configuration complete message.

Step 414, (FACH/DCCH) RLC Status (ACK UL SN — 3);

and the RRC of the RNC receives the RB configuration completion message sent by the UE.

Claims (6)

1. A method for switching new and old configuration at a radio network controller side is applied to channel type switching or hard switching, and is characterized by comprising the following steps:

(1) when the new configuration and the old configuration exist at the same time but the new configuration and the old configuration are not switched, a user of the radio network controller RNC sends and receives data on the old configuration and waits for receiving the data on the new configuration;

(2) if the user plane detects that the effective data is received on the new configuration, the user plane starts switching and switches all protocol layers to be switched to the new configuration; the effective data is uplink data of User Equipment (UE).

2. The method of claim 1, wherein step (2) further comprises: if the user plane detects that the effective data is received on the new configuration, the user plane transmits the received effective data to an upper layer; the upper layer refers to a radio resource controller RRC.

3. The method of claim 1, wherein step (2) further comprises: and if the user plane does not receive the new configuration data, returning to the step (1) to continue waiting for receiving.

4. The method of claim 1, further comprising:

(3) if the user plane receives a switching command of a Radio Resource Controller (RRC), judging whether the user plane performs switching or not, and if the switching is completed, not processing the switching command; and if the user plane does not switch, switching between the new configuration and the old configuration according to the switching command.

5. The method of claim 1, wherein the user plane comprises a media access control layer.

6. The method of claim 1, wherein the user plane comprises a frame protocol layer.

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