WO2007010609A1

WO2007010609A1 - Wireless communication system

Info

Publication number: WO2007010609A1
Application number: PCT/JP2005/013403
Authority: WO
Inventors: Masao Ohga; Nobuo Kikuchi
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2005-07-21
Filing date: 2005-07-21
Publication date: 2007-01-25

Abstract

A retransmission control part (18) provided in a layer (2) requests a retransmission when detecting an unarrival of a channel establishment/change completion message including an anonymity execution start time and anonymity information. When receiving the retransmission request from the retransmission control part (18), a radio channel control part (10) provided in a layer (3) establishes a new anonymity start time and outputs a channel establishment/change completion message including this anonymity start time.

Description

Specification

Wireless communication system

Technical field

TECHNICAL FIELD [0001] The present invention relates to a wireless communication system for concealing user data and requiring synchronization of a concealment execution start time and concealment information between devices performing concealment processing.

Background art

[0002] In mobile access technologies such as FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), and W-CDMA (Wideband-Code Division Multiple Access), which are mobile communication technologies, An area called a cell is constructed as a unit for managing terminals, and this cell is managed by the base station.

[0003] Each time a mobile terminal moves from one cell to another, it is necessary to change the radio channel used in the current cell to the radio channel used in the destination cell. Along with this, there are cases where related secret settings also need to be changed. Regarding this procedure, for example, the W-CDMA technology is defined by 3GPP (3rd Generation Partnership Project), one of the standardization bodies.

[0004] Further, as a conventional technique, for example, there is a technique disclosed in Patent Document 1. This technology assigns the number of retransmissions to the transmission signal in Layer 2 Acknowledge mode (AM) in order to make the channel switching execution start time coincide between the mobile terminal and the base station. On the other hand, it is intended to re-update the channel switching execution start time by providing a means to notify the layer 2 retransmission status.

Patent Document 1: Japanese Patent Laid-Open No. 2003-174661

[0006] As described above, the control of the execution start time represented by the conventional channel switching is characterized by being affected by the retransmission state of the layer 2. In the W—CDMA wireless communication system, the frame number CFN (Connected Frame Number) is used as the execution start time of radio channel setting, and there is a concealment process that requires the same procedure. [0007] In the above-described execution start time control, in the case of the conventional concealment control, when the secrecy execution start time transmitted from the mobile terminal and retransmission of the channel setting / change completion message including the concealment information occurs, the concealment is performed. The message may not reach the network by the execution start time. For this reason, the secret execution start time and the secret information cannot be synchronized between the mobile terminal and the network device, and the user data cannot be reproduced correctly because the secret release fails.

[0008] The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless communication system capable of avoiding a secret execution start time and a synchronization mismatch of secret information.

Disclosure of the invention

[0009] The wireless communication system according to the present invention includes: a retransmission control unit that performs a retransmission request when detecting that the channel setting Z change completion message including the confidentiality execution start time and the confidential information is unreachable; Control unit power This is equipped with a radio channel control unit that outputs a channel setting Z change completion message including a new concealment start time when a retransmission request is received.

In this way, it is possible to obtain a wireless communication system capable of avoiding a synchronization execution start time and confidential information synchronization mismatch between the mobile terminal and the wireless network control device.

Brief Description of Drawings

FIG. 1 is a configuration diagram showing a wireless communication system according to Embodiment 1 of the present invention.

FIG. 2 is a functional block diagram of mobile terminal 1 and radio network control apparatus 3 to which the radio communication system according to Embodiment 1 of the present invention is applied.

FIG. 3 is an explanatory diagram (part 1) showing a sequence of secret information synchronization procedures between a mobile terminal and a wireless network control device in the wireless communication system according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram (No. 2) showing a sequence of a secret information synchronization procedure between a mobile terminal and a wireless network control device in the wireless communication system according to the first embodiment of the present invention. FIG. 5 is an explanatory diagram showing SRB layer 2 ZRLC setting values of the wireless communication system according to embodiment 1 of the present invention;

FIG. 6 is an explanatory diagram showing the configuration of COUNT-C of the wireless communication system according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram (part 1) showing a sequence of secret information synchronization procedures between a mobile terminal and a wireless network control device in a wireless communication system according to a second embodiment of the present invention.

FIG. 8 is an explanatory diagram (No. 2) showing a sequence of a secret information synchronization procedure between a mobile terminal and a wireless network control device in a wireless communication system according to Embodiment 2 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, in order to describe the present invention in more detail, the best mode for carrying out the invention will be described with reference to the accompanying drawings.

Embodiment 1.

FIG. 1 is a configuration diagram showing a radio communication system according to Embodiment 1 of the present invention. This figure shows an outline of the network configuration in the W-CDMA wireless communication system.

[0013] A mobile terminal 1 capable of a mobile communication service such as voice communication communicates with a base station 2a via a wireless interface. Furthermore, the mobile terminal 1 passes through the base station 2a and the mobile terminal 1 and It is connected to the radio network controller RNC (Radio Network Controller) 3 that controls the base station 2a and the subscriber network 4 (core network: CN). In addition, another network 5 such as a PSTN (Public Switched Telephone Network) is connected to the customer exchange 4. With such a configuration, the mobile terminal 1 can execute a mobile communication service such as voice communication. Radio channel setting Z accompanying the movement of the mobile terminal 1 The Z change procedure is performed between the mobile terminal 1 and the radio network controller 3.

FIG. 2 is a functional block diagram of mobile terminal 1 and radio network control apparatus 3 to which the radio communication system according to Embodiment 1 of the present invention is applied. The mobile terminal 1 and the radio network control device 3 perform the secrecy setting with the radio channel control unit 10 that controls the radio channel setting Z change Z release belonging to layer 3 in order to realize this radio communication system. Concealment control unit 11 is provided.

Radio channel control unit 10 includes radio channel processing unit 12 that performs radio channel setting Z release for layer 1 and radio channel control message retransmission processing unit 13 that performs retransmission control of radio channel control messages. The secrecy control unit 11 includes a secrecy processing unit 14 that performs secrecy setting for the layer 2 ZMAC when a layer 2 ZRLC (Radio Link Control Protocol) mode is TM mode, a secrecy start time processing unit 15 that calculates a secrecy start time, and a secrecy And a secret information management unit 16 for managing information.

[0016] Further, in the layer 2ZMAC, a concealment execution unit 17 is provided that executes concealment processing based on the concealment execution start time and the concealment information set through the concealment processing unit 14. Further, in layer 2 ZRLC, when it is detected that the channel setting Z change completion message including the secret execution start time and the secret information is unreachable, a retransmission control unit 18 that makes a retransmission request is provided. Also, in the layer 2 ZMAC, an RLC data demultiplexing unit 19 that performs demultiplexing Z of RLC data is provided.

Next, the operation of the radio communication system in the first embodiment will be described.

3 and 4 are sequence diagrams showing a secret information synchronization procedure between the mobile terminal 1 and the radio network control device 3 in the radio communication system.

[0018] In response to a circuit switching service request such as voice communication by the mobile terminal 1, an RRC Connection setting procedure is executed between the mobile terminal 1 and the radio network controller 3, and an SRB (Signaling) that is a radio link for control signaling Radio Bearer) is established (SQ101). At this time, the layer 2 ZRLC mode is set for each SRB, and the AM mode is used to improve the reachability of the control signaling information. However, the same SRB is used for each control such as measurement control and radio channel control.

FIG. 5 shows an example of SRB layer 2 ZRLC configuration parameters.

Here, Layer 2 retransmission control # 4 is retransmission control information of the radio link that transmits the channel setting Z change completion including the confidentiality execution start time and confidential information, and other wireless links shown in # 1 to # 3. It is set to be different from the retransmission control information. For example, in the illustrated example The retransmission timer value is 500 ms and the maximum number of retransmissions is 0, that is, no retransmission is performed.

[0020] Next, a Radio Bearer setting procedure is executed to establish RB (Radio Bearer) in which the layer 2ZRL C mode, which is a radio link for user data by circuit switching service, is set to TM mode (Transparent mode) . At the same time, concealment is set for this RB. At this time, the secret execution start time CFN and the HFN (Hyper Frame Number) constituting a part of the secret information COUNT—C are the mobile terminal 1 and the radio network controller in the radio bearer setup complex, which is a layer 3 message. Passing is performed between the three, and both sides start concealment at the same concealment execution start time (SQ102).

FIG. 6 is an explanatory diagram showing the configuration of COUNT-C.

COUNT—C is a 32-bit counter that uses the HFN value for the upper 24 bits and the CFN value for the lower 8 bits. When the channel setting Z is changed, the HFN value constituting the confidential information is set to the fixed mode, and after the channel setting Z change is completed, the HFN value is returned to the increment mode. This HFN mode switching execution start time is the secret execution start time CFN.

In this state, when the mobile terminal 1 moves from the range of the cell a to the range of the cell b and detects that the quality of the cell b is better than the cell a, the mobile terminal 1 Reports measurement information including the measurement result of the cell to the radio network controller 3 by a Measurement Report message (SQ103).

Radio network control apparatus 3 determines the start of channel switching from base station 2a to base station 2b based on the received measurement information (SQ104). Radio network control device 3 transmits a Physical Channel Reconfiguration message in which channel setting Z change procedure execution start time m is set in order to notify mobile terminal 1 of the start of channel setting Z change. Perform Z change procedure (SQ105).

[0024] The radio channel processing unit 12 of the mobile terminal 1 that has received the message sets channel information included in the Physical Channel Reconfiguration message for layer 1. At this time, the concealment processing unit 14 notified of the start of the radio channel setting Z change procedure from the radio channel processing unit 12 changes the HFN value as the secrecy information to the HFN fixed mode. Therefore, the HFN value is set in the layer 2 ZMAC concealment execution unit 17 (SQ106). Channel setting Z Change procedure execution start time After switching to channel setting with base station 2b at m, layer 1 detects synchronization with base station 2b at layer 1, and layer 1 establishes synchronization with radio channel processing unit 12 Is reported (SQ107).

[0025] When the establishment of layer 1 synchronization is detected, the radio channel processing unit 12 notifies the concealment processing unit 14 of the completion of the channel setting Z change procedure in order to start the channel setting Z change completion notification. Accordingly, the concealment processing unit 14 acquires the concealment execution start time for changing the concealment setting from the HFN fixed mode cover to the HFN increment mode from the concealment start time processing unit 15 (HFN = A + 1, CFN = Ta), The confidential information stored in the confidential information management unit 16 is set in the confidential execution unit 17 of the layer 2ZMAC (SQ108).

[0026] The concealment processing unit 14 notifies the radio network control unit 3 of the concealment execution start time and concealment information set in the concealment execution unit 17 after the concealment setting is completed. Forward. As a result, the radio channel processing unit 12 sets this confidential information in the Physical Channel Reconfiguration Complete message, which is a channel setting / change completion message, and notifies the radio network controller 3 using SRB # 4. (SQ109). At this time, the layer 2 / RLC setting value of SRB # 4 is set to satisfy the relationship of Ta> maximum number of retransmissions X retransmission timer so that retransmission failure can be detected before the frame time when CFN = Ta. Or be reset!

[0027] As shown in SRB # 4 in FIG. 5, in this embodiment, the layer 2 ZRLC retransmission procedure is not performed, and it is designed to detect message non-arrival after the retransmission timer expires. Has been. SRB # 4 Layer 2ZRLC configuration is performed at the time of RRC Connection procedure, Radio Bearer procedure or Reconfiguration procedure that can reconfigure Layer 2 ZRLC

[0028] Here, if the Physical Channel Reconfiguration Complete message is lost in the radio section, the retransmission control unit 18 of the layer 2 ZRLC has not received a delivery confirmation from the radio network control device 3 after the retransmission timer 500ms elapses. Without retransmission, the wireless channel control unit 10 is notified of the non-arrival detection result of the Physical Channel Reconfiguration Complete message (SQ110). The radio channel processing unit 12 that has received the non-delivery notification acquires a new concealment execution start time (CFN = Tb) from the concealment start time processing unit 15 through the concealment processing unit 14. The concealment processing unit 14 resets the new concealment information in the concealment execution unit 17 of the Layer 2 ZMAC (the SQllDo radio channel control message retransmission processing unit 13 updates the contents of the Physical Channel Reconfiguration Complete message based on the concealment information. Then, the wireless network control device 3 is notified again of the new secret † blueprint (SQ 112).

[0030] As described above, according to the wireless communication system of the first embodiment, the confidential information is transmitted between the mobile terminal and the wireless network control device based on the confidential execution start time and the confidential information common to the mobile terminal and the wireless network control device. In the wireless communication system to be synchronized, when it is detected that the channel setting / change completion message including the concealment execution start time and the concealment information is unreachable, a retransmission control unit that performs a retransmission request and a retransmission control unit When a retransmission request is received, it is equipped with a radio channel control unit that outputs a channel setting Z change completion message including a new concealment start time, so that the mobile terminal power is also transmitted to the radio network controller. It becomes possible to avoid the mismatch of the confidential start timing information due to the non-arrival of the Z change completion message, and the user data can be successfully released from confidentiality. It is possible.

[0031] Also, according to the radio communication system of the first embodiment, retransmission control of a radio link that transmits a channel setting Z change completion message including the secrecy execution start time and secrecy information includes retransmission control of other radio links. Therefore, it is possible to freely set the number of retransmissions when transmitting the channel setting Z change completion message including the confidential information and the confidentiality execution start time, for example, compared to the retransmission control of other radio links. By setting a small number of retransmissions, it is possible to more reliably avoid inconsistency in the confidential start timing information due to the non-arrival of the channel setting Z change completion message transmitted from the mobile terminal to the radio network controller. .

[0032] Embodiment 2.

In the first embodiment, the case where the channel setting Z change completion message is missing in the radio section and does not reach the secret execution start time CFN = Ta is shown. In the second embodiment, the mobile terminal is changed according to the layer 2 ZRLC retransmission parameter setting and the retransmission state. Message non-delivery detection timing and channel setting Z change completion message retransmission procedure at the end l and a situation in which the reception order of layer 2 ZRLC delivery confirmation (ST ATUS) from the radio network controller 3 is reversed occurs. It is shown. The configuration on the drawing is the same as that in FIG. 1 and FIG. 2 in the first embodiment, and will be described with reference to these drawings.

[0033] That is, radio channel control section 10 in Embodiment 2 receives a channel setting Z change completion message including the ciphering execution start time and the ciphering information from the counterpart device, and then receives a new ciphering execution start time and When a channel setting Z change completion message containing confidential information is received, the channel setting Z change completion message including the latest confidential execution start time and confidential information is validated. In this embodiment, Ta> maximum number of retransmissions X is set to satisfy the relationship of retransmission timer, but the maximum number of retransmissions is set to a plurality of times.

FIG. 7 and FIG. 8 are sequence diagrams showing a secret information synchronization procedure in the second embodiment.

After detecting the establishment of layer 1 synchronization, the radio channel processing unit 12 of the mobile terminal 1 performs concealment setting in cooperation with the concealment control unit 11 as in the first embodiment (SQ121), and notifies channel setting Z change completion. A Physical Channel Reconfiguration Complete message is transmitted (SQ122).

[0035] Here, if the Physical Channel Reconfiguration Complete message is missing, the layer 2 ZRLC retransmission procedure operates. In this state, if the retransmission control unit 18 detects a message non-delivery due to Layer 2 ZRLC delivery confirmation not received by the mobile terminal 1, it starts the retransmission procedure of the channel setting Z change completion notification (SQ123), and also executes confidentiality. Update the start time (CFN = Tb).

Here, when retransmission data has reached radio network control apparatus 3 due to retransmission control of mobile terminal 1, radio network control apparatus 3 determines the received secrecy execution start time (CF N = Ta) and secrecy. Concealment is set using the information (SQ124). Then, the wireless network control device 3 outputs a layer 2 ZRLC delivery confirmation (STA TUS) indicating that the concealment is set. On the other hand, before receiving this on the mobile terminal 1 side, When the retransmission timer times out, the radio channel processing unit 12 performs the secrecy setting with the new secrecy execution start time (CFN = Tb) as in the first embodiment (SQ125). That is, the order of layer 3 retransmission and layer 2 delivery confirmation is reversed between the mobile terminal 1 and the radio network controller 3 (SQ 126).

[0037] In this way, when the order of message non-arrival detection of mobile terminal 1 and delivery confirmation from radio network control apparatus 3 is reversed, radio network control apparatus 3 changes channel setting Z of mobile terminal 1 In response to the completion notification resend, new confidential information (HFN = A, CFN = Tb) is acquired (SQ127). When the wireless channel control unit 10 of the wireless network control device 3 confirms that the confidential information included in the received channel setting Z change completion message has been updated, it resets the confidential information using the new confidential information. Do (SQ128

) o

[0038] As described above, according to the radio communication system of the second embodiment, the radio control unit receives the channel setting Z change completion message including the secrecy execution start time and the secrecy information from the counterpart device. When the channel setting Z change completion message including the new secret execution start time and secret information is received, the channel setting Z change completion message including the latest secret execution start time and secret information is enabled. Even if the mobile terminal message non-delivery detection timing and the confidential information delivery confirmation order from the wireless network control device are reversed, it is possible to avoid the confidential execution start time and the confidential information mismatch, There is an effect of avoiding the state of confidential information mismatch. Industrial applicability

As described above, the radio communication system according to the present invention has a concealment function, and the radio channel setting / changing procedure between the mobile terminal and the network control device in the radio communication system. For example, it is suitable for use in a W-CDMA wireless communication system.

Claims

The scope of the claims

[1] In a wireless communication system that synchronizes confidential information between a mobile terminal and a wireless network control device based on the confidential execution start time and confidential information that are common to the mobile terminal and the wireless network control device,

A retransmission control unit that makes a retransmission request when it is detected that the channel setting Z change completion message that does not include the confidentiality execution start time and confidential information is received.

A radio communication system comprising: a radio channel control unit that outputs a channel setting Z change completion message including a new concealment start time when a retransmission request is received.

[2] Channel setting including concealment execution start time and concealment information Retransmission control of a radio link that transmits a Z change completion message is configured to be different from retransmission control of other radio links. Item 1. The wireless communication system according to Item 1.

[3] The radio control unit receives the channel setting Z change completion message including the secret execution start time and the secret information from the partner device, and then completes the channel setting Z change completion including the new secret execution start time and the secret information. 2. The wireless communication system according to claim 1, wherein when the message is received, the channel setting Z change completion message including the latest secret execution start time and secret information is validated.