JP2006020133A - Secrecy processor and secrecy processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a secrecy processor for performing secrecy processing in an RLC (Radio Link Control) on real time. <P>SOLUTION: The secrecy processor comprises a first process by a MAC (3) for separating and decomposing a transport block into a MAC header, an RLC header and a payload with a timing synchronized to a specific transmitting time interval, a second process by an RLC (5) for performing secrecy processing on the payload using a key stream block computed by a known processing advised by a 3GPP standard with a timing synchronized to the time when the first process is completed, a third process by the MAC (3) for performing train control in a transport block unit for the MAC header, the RLC header and the decoded payload from the secrecy processing with a timing synchronized to the time when the second process is completed, and a fourth process by the RLC (5) for performing RLC functions other than the secrecy processing advised by the 3GPP standard. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a confidential processing device and a confidential processing method for realizing the confidential processing specified by 3GPP, and particularly to a confidential processing device and a confidential processing method for executing the confidential processing in real time on the receiving side. Is.

Hereinafter, a conventional concealment process will be described. For example, the following non-patent document 1 includes 3GPP (3 rd Generation Partnership Project) standard protocol stack outline. Non-Patent Document 2 below describes the architecture of a MAC (Medium Access Control) on the UE (User Equipment) side when using the transport channel HS-DSCH (High Speed Downlink Shared Channel). Non-Patent Document 3 below describes connection models of unacknowledged data transfer (UM: Unacknowledged Mode) RLC (Radio Link Control) and acknowledged data transfer (AM: Acknowledge Mode) RLC, respectively.

  A conventional RLC of a user terminal performs a ciphering / deciphering process on a logical channel using AM or UM. The concealment process is performed on the payload in the “RLC PDU (Protocol Data Unit)”.

  Conventionally, in the case of UM or AM in data transmission processing in a mobile terminal test apparatus, parameters created by the RLC are notified to the MAC and masked by a mask data (key stream block) computing unit dedicated to the MAC. By calculating the data, a test relating to the secrecy of the mobile communication terminal has been performed at high speed and stably. Moreover, the configuration of the test apparatus has been simplified by calculating mask data with a single mask data calculator regardless of the UM and AM data transfer modes (see Patent Document 1).

JP-A-2003-318800, pages 4 to 5, FIGS. 1 and 6 3GPP Specification “TS25.301 Version 5.2.0” 3rd Generation Partnership Project, 13 September 2002, P31, Figure 12 3GPP Specification “TS25.321 Version 5.7.0” 3rd Generation Partnership Project, 04 January 2004, P8-13, Figure 4.2.3.2.1, Figure 4.2.3.3.1 3GPP Specification “TS25.322 Version 5.7.0” 3rd Generation Partnership Project, 04 January 2004, P10-16, Figure 4.3, Figure 4.4, P24-37, Figure 9.2, Figure 9.3

  However, the conventional concealment process using the mask data calculator disclosed in Patent Document 1 can be applied only to transmission data. For example, for received data, a parameter for RLC to generate mask data is used. There is a problem that the MAC cannot be notified before the received data is processed.

  The above problem will be described in detail with reference to FIGS. FIG. 7 is a diagram illustrating a flow of data between protocols on the UE side when not HSDPA (High Speed Downlink Packet Access) communication defined by 3GPP. FIG. 8 is a diagram showing a concealment process for transmission data and reception data defined by 3GPP (3GPP Specification “TS33.105 Version 4.1.0” 3rd Generation Partnership Project, 04 July 2001, P14-17, Figure 1). It is. The illustrated PLANETEXT and CIPHERTEXT correspond to the payload of the “RLC PDU” that is the target of concealment. For encryption, KEY-STREAM-BLOCK is subjected to exclusive OR operation for each bit and converted to CIPHERTEXT. In the decryption, KEY-STREAM-BLOCK is exclusive-ORed with CIPHERTEXT for each bit and converted to PLANETEXT.

  First, it is necessary to use information included in the RLC header 101-2 for parameter calculation for generating mask data for confidential processing. In the case of transmission data, the RLC already knows the contents of the RLC header 101-2 when sending the "RLC PDU" to the MAC. Therefore, the confidential parameter is calculated and the calculation result is sent to the MAC simultaneously with the "RLC PDU". You can be notified. However, in the case of received data, the RLC header 101-2 is information added by the communication partner RLC, and the RLC needs to analyze the RLC header 101-2 in order to know the content. Therefore, before receiving the “RLC PDU” from the MAC, the RLC cannot notify the confidential parameter to the MAC.

  Therefore, in the conventional method, the MAC cannot calculate the mask data at the time of reception, and cannot operate the apparatus at high speed and stably.

  On the other hand, when applied to the reception of HSDPA data standardized after 3GPP release5, the following processing is performed. FIG. 9 is a diagram illustrating a data flow between protocols on the UE side in the case of HSDPA communication defined by 3GPP. According to TS25.321, when performing communication by HSDPA, automatic retransmission control (H-ARQ: Hybrid Automatic Repeat Request) is performed in MAC. Error control is performed for each “MAC-hs PDU” using H-ARQ. When an error that cannot be corrected is detected on the receiving side, a retransmission request is notified from the receiving side to the transmitting side, and the erroneous data is selected. Will be resent. As a result, data is received out of the original order on the communication path in which an uncorrectable error occurs. Therefore, TS25.321 recommends that MAC performs order control (reordering) and notifies RLC of “RLC PDU” for which order control has been completed.

  FIG. 10 is a diagram showing a general MAC & RLC configuration in a user terminal, and shows an implementation example of MAC & RLC in which functions are divided by a protocol layer in accordance with the 3GPP standard. PHY1 of L1 (layer 1) provides a bit string transmission service using a communication medium (radio wave) with a communication partner. Transport-Block-memory 2 stores data of a transport block that is a transmission unit from PHY 1. The MAC (reordering 3-1, disassembly 3-2) 3 has a function of executing a protocol recommended by TS25.321, and RLC (deciphering 5-1, AM / UM 5-2) 5 via the RLC-PDU-memory 4. A transmission service using a plurality of logical channels is provided. In the case of HSDPA communication, the user equipment (UE) controls the order of the received transport blocks, disassembles the transport blocks returned to the correct order, and notifies the result to the RLC 5 as logical channel data. Reordering-buffer-memory 6 stores a plurality of transport blocks input from Transport-Block-memory 2 until the order control is completed. The RLC 5 has a function of executing a protocol recommended by TS25.322, and provides a link level data transfer service to the L3 (layer 3). This RLC5 function includes a concealment process.

  For example, when an error that cannot be corrected occurs in PHY 1, a plurality of transport blocks stay in Reordering-buffer-memory 6. Furthermore, according to TS25.321, since one transport block includes a plurality of payloads of RLC5 that is a concealment target, when errors that cannot be corrected frequently occur in PHY1, a large amount is included in Reordering-buffer-memory6. The payload will stay. Then, a large amount of payload is transferred from the MAC 3 to the RLC 5 at a time and stored in the RLC-buffer-memory 7. At this time, the RLC 5 needs to execute a concealment process for a large amount of payload. The concealment process requires a relatively long calculation time. When the concealment process is performed on a large amount of payload, processing congestion and a large processing delay occur.

  FIG. 11 is a time chart showing a general MAC & RLC operation in the UE, and shows an example in which the processing of the RLC 5 is delayed. Here, the concealment process of four transport blocks staying in the Reordering-buffer-memory 6 is executed at a time. Therefore, even if the next transport block is passed from the MAC 3, the process is kept waiting until the concealment process of the four transport blocks passed before is completed. In this example, the case of four transport blocks is described, but according to the TS25.321 standard, more transport blocks may be passed to the RLC 5 at a time. In such a case, there is a possibility that the system performance may be degraded such as a real-time processing failure or communication throughput degradation.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a confidential processing device for executing the confidential processing in RLC in real time.

  In addition, even when HSDPA is applied to data communication and a large amount of data stays in the MAC, the confidential processing in RLC is executed in real time to prevent processing congestion and ensure system performance such as communication throughput. An object of the present invention is to obtain a secret processing device capable of performing the above.

  In order to solve the above-described problems and achieve the object, the concealment processing device according to the present invention receives a transport block at a transmission time interval, and transmits parameters necessary for concealment processing within a predetermined time from the transport block. A cipher processing device using MAC and RLC that performs cipher processing on the receiving side using the extraction result, and extracts the transport block from the MAC header, RLC header at a timing synchronized with the transmission time interval, for example The KEY-STREAM-BLOCK is calculated by a known process recommended in the 3GPP standard at the timing synchronized with the first step by the MAC that is separated and disassembled into the payload and when the first step is completed. R to perform a concealment process on the payload by calculating an exclusive OR of the KEY-STREAM-BLOCK and the KEY-STREAM-BLOCK MAC that performs order control in units of transport blocks on the MAC header, RLC header, and payload decrypted by concealment processing at the timing synchronized with the second step by C and the time when the second step is completed And a fourth step by RLC that executes an RLC function recommended by the 3GPP standard other than the confidential processing.

  According to the present invention, the functions of MAC and RLC, that is, the confidential processing device according to the present invention, are realized by being divided into the first to fourth steps.

  According to the present invention, for example, the parameters necessary for the concealment process can be extracted from the transport block within a certain time after receiving the transport block at the TTI interval. As shown in FIG. 4, it can be performed in real time in synchronization with the TTI. Therefore, it is possible to prevent processing congestion and to suppress the required performance of the MAC and RLC, and it is possible to secure system performance such as communication throughput at low cost.

  Embodiments of a confidential processing device according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an outline of a protocol stack according to the 3GPP standard. A user terminal (UE) is a software group consisting of PHY (Physical) 1 of L (layer) 1, MAC 3 of R 2, RLC 5, and L 3. And connected to a NodeB and SRNC (Serving Radio Network Controller).

  Here, the configuration of the L2 MAC & RLC of the first embodiment for realizing the confidential processing device according to the present invention will be described. FIG. 2 is a diagram showing the configuration of the UE and the detailed configuration of the MAC & RLC according to the present invention.

  PHY1 of L1 provides a bit string transmission service using a communication medium (radio wave), an RF circuit, an A / D converter, a D / A converter, a modem, an encoder / decoder, a CPU that performs control and signal processing And a circuit such as a DSP.

  The Transport-Block-memory 2 of L2 has a function of storing data of a transport block that is a transmission unit from PHY1. Further, the disassembly 3-1 of the MAC 3 has a function of separating the transport block of the data flow of FIG. 7 into the MAC header 101-1, the RLC header 101-2, and the payload 101-3 when the HSDPA communication is not performed. In the case of HSDPA communication, the transport block of the data flow in FIG. 9 is disassembled into “MAC-hs SDU (synonymous with MAC-d PDU)”, and “MAC-hs SDU (Service Data Unit)” is further converted into MAC. It has a function of separating the header 101-1, RLC header 101-2, and payload 101-3. Further, the RLC-PDU-memory 4 has a function of storing the MAC header 101-1, the RLC header 101-2, and the payload 101-3 which are separated and separated. As shown in FIG. 9, a plurality of “RLC PDUs” may be included in one transport block (corresponding to “MAC-hs PDU”). In this case, a plurality of “RLC-PDU-memory4” A set of the MAC header 101-1, RLC header 101-2, and payload 101-3 is stored.

  The deciphering 5-1 of the RLC 5 has a function of performing a concealment process on the payload 101-3 stored in the RLC-PDU-memory 4. Further, when the reordering 3-2 of the MAC3 is not HSDPA communication, the MAC header 101-1, the RLC header 101-2, and the payload 101-3 decoded by the concealment process are transferred to the Reordering-buffer-memory 6, and the AM / R of the RLC5 In the case of HSDPA communication, on the other hand, in the case of HSDPA communication, the MAC header 101-1, the RLC header 101-2, and the payload 101-3 decrypted by the concealment process are sent to the Reordering-buffer-memory 6. It has a function of notifying the AM / UM 5-2 of the RLC 5 of a set of a plurality of MAC headers 101-1, RLC headers 101-2, and payloads 101-3 that have been transferred and reordered. In addition, the Reordering-buffer-memory 6 includes a plurality of MAC headers 101-1 and RLC headers decoded by the ciphering process after the decoding is completed by the ciphering process until the AM / UM5-2 reads and transfers to L3. It has a function of storing a set of 101-2 and payload 101-3. Further, the AM / UM5-2 of RLC5 has a function of executing a protocol recommended by TS25.322 other than secrecy, and provides a link level data transfer service to L3.

  In the present embodiment, functions or processing procedures of L1 PHY1, L2 disassembly 3-1, deciphering 5-1, reordering 3-2 and AM / UM 5-2 are defined, and the hardware to be mounted is defined. Not what you want.

  Subsequently, the operation of the UE on the receiving side will be described. FIG. 3 is a time chart showing operations of the MAC 3 and the RLC 5 of the UE.

  First, PHY1 of L1 provides a bit string transmission service using a communication medium (radio wave) with a communication partner. In PHY1, as a receiving operation, a demodulated received symbol is detected, and error correction and error detection are performed on the received symbol in units of TTI (Transmit Time Interval). Then, the received data determined to have no error is recorded in Transport-Block-memory 2 as a transport block.

  The Transport-Block-memory 2 is updated once at TTI intervals as shown in FIG. Although the update interval of Transport-Block-memory 2 is drawn constant, the processing time of PHY 1 depends on the data amount, and the data amount varies for each TTI, so the actual update interval is not necessarily constant. .

  In disassembly 3-1 of MAC3, the transport block recorded in Transport-Block-memory2 is separated and disassembled into MAC header 101-1, RLC header 101-2, and payload 101-3. As the processing timing, the processing may be performed every time the Transport-Block-memory 2 is updated. Therefore, as an example of easy implementation, the processing is scheduled to start at the TTI cycle. In disassembly 3-1, payload 101-3 is arranged so as to facilitate concealment processing and is recorded in RLC-PDU-memory 4. Details of the “arrangement that facilitates concealment processing” will be described later. Since the operation differs depending on whether the communication is not HSDPA communication or HSDPA communication, each case will be described in more detail.

  For example, when it is not HSDPA communication, disassembly 3-1 separates the received transport block recorded in Transport-Block-memory 2 into MAC header 101-1 and “RLC PDU” as shown in FIG. 7. Then, the “RLC PDU” is separated into the RLC header 101-2 and the payload 101-3. Further, information necessary for the concealment process is extracted from the RLC header 101-2, and the payload 101-3 is arranged so as to facilitate the concealment process, and is recorded in the RLC-PDU-memory 4.

  On the other hand, in the case of HSDPA communication, in disassembly 3-1, the received transport block recorded in Transport-Block-memory 2 is transferred to “MAC-hs SDU (synonymous with“ MAC-d PDU ”)” as shown in FIG. Further, the “MAC-d PDU” is separated into the MAC header 101-1 and the “RLC PDU”. Then, the “RLC PDU” is separated into the RLC header 101-2 and the payload 101-3. Further, information necessary for the concealment process is extracted from the RLC header 101-2, and the payload 101-3 is arranged so as to facilitate the concealment process, and is recorded in the RLC-PDU-memory 4.

  Here, the separation of the header and the arrangement of the payload 101-3 will be described. FIG. 4 is a diagram showing an example of the structure of data recorded in the RLC-PDU-memory 4, and here, paying attention to the payload 101-3 in particular. Usually, the memory has a specific word length (bit width: 8 bits, 16 bits, 32 bits, etc.). When processing data on the memory, it is easy to perform the processing if the data is arranged in accordance with the word length of the memory. Therefore, in this embodiment, the payload 101-3 is divided and arranged according to the word length of the memory. In the present embodiment, MAC header 101-1 and RLC header 101-2 are arranged at addresses different from payload 101-3. This can be realized by bit-shifting the beginning of the payload 101-3 to the MSB of the memory word. Note that FIG. 4 will be described in detail in a third embodiment to be described later.

  As described above, in the disassembly 3-1 of the MAC3, the “MAC-PDU” included in the transport block recorded in the Transport-Block-memory2 is extracted, and the head of the payload 101-3 is bit-shifted to the MSB of the word of the memory. The MAC header 101-1, RLC header 101-2, and payload 101-3 are separated and written to the RLC-PDU-memory 4. In the case of HSDPA communication, the same processing is performed on a plurality of “MAC-d PDUs” included in the transport block. Further, when these processes are completed, the disassembly 3-1 notifies the deciphering 5-1 of the RLC 5 of the length of the payload 101-3 of each “RLC PDU” and the completion of the process.

  In the deciphering 5-1 of the RLC 5, a concealment process is performed on the payload 101-3 of the “RLC PDU” recorded in the RLC-PDU-memory 4. The processing timing is illustrated in FIG. Here, the process is scheduled to start when the process of disassembly 3-1 is completed. As a result, the deciphering 5-1 starts processing in the TTI cycle. In addition, although the concealment process takes a relatively long time, since the maximum value of the data amount (the size of the payload 101-3) received in the TTI cycle is determined, the processing is performed within the TTI time when the maximum data amount is received. It is relatively easy to design the performance of deciphering 5-1 so that the process ends. For example, there is a method of using a dedicated hardware accelerator for calculating KEY-STREAM-BLOCK with a large amount of calculation.

  In addition, the cipher processing by deciphering 5-1 is recommended in TS33.105 of the 3GPP standard, and is achieved by calculating the exclusive OR of CIPHERTEXT or PLANETEXT and KEY-STREAM-BLOCK as shown in FIG. it can. Note that the secret key CK (Cipher Key), the BEARER indicating the type of the logical channel, and the DIRECTION indicating the difference between the uplink and the downlink are notified to the RLC 5 from the host controller at the time of communication negotiation. Since LENGTH is the length of KEY-STREAM-BLOCK and is the same as the length of payload 101-3, it is notified from disassembly 3-1. Further, the concealment sequence number COUNT-C is “RLC” included in the RLC header 101-2 corresponding to the hyperframe number HFN notified from the host controller to the RLC 5 during communication negotiation and the payload 101-3 to be concealed. It can be specified by combining Sequence Number (“RLC SN”).

  Therefore, in deciphering 5-1, first, COUNT-C for each "RLC PDU" is calculated from HFN notified from the host controller and "RLC SN" included in the RLC header 101-2. Next, KEY-STREAM-BLOCK is calculated using the calculated COUNT-C, CK, BEARER and DIRECTION notified from the host controller, and LENGTH notified from disassembly 3-1 as inputs. Then, a concealment process is performed by calculating an exclusive OR of the received payload 101-3 and the calculated KEY-STREAM-BLOCK. When the concealment process is completed for all payloads 101-3, the process end is notified to reordering 3-2.

  In reordering 3-2 of MAC3, when it is not HSDPA communication, payload 101-3 decrypted by MAC header 101-1, RLC header 101-2, and concealment processing is transferred to Reordering-buffer-memory6, and this is indicated in RLC5. Notify AM / UM5-2. On the other hand, in the case of HSDPA communication, the MAC header 101-1, RLC header 101-2 and the payload 101-3 decoded by the concealment process are transferred to the Reordering-buffer-memory 6, and further the MAC header 101-1, RLC The order is controlled in units of a plurality of transport blocks including the header 101-2 and the payload 101-3, and the RLC header 101-2 and the payload 101-3 restored to the correct order are notified to the AM / UM 5-2. The processing timing of reordering 3-2 is illustrated in FIG. Here, the process is scheduled to start when the process of deciphering 5-1 ends. As a result, reordering 3-2 starts processing in the TTI cycle.

  The AM / UM5-2 of RLC5 executes protocol processing recommended to TS25.322 other than confidentiality, and notifies SDU (Service Data Unit) to L3. The processing timing is illustrated in FIG. For example, when the communication is not HSDPA communication, the above processing is executed every time data is received at a TTI interval. On the other hand, in the case of HSDPA communication, the above-described processing is collectively performed on data of a plurality of TTIs notified from reordering 3-2 (RLC header 101-2 and payload 101-3 decrypted by concealment processing.

  As described above, in the present embodiment, the functions of the MAC 3 and the RLC 5 are changed to disassembly 3-1, RLC-PDU-memory 4, deciphering 5-1, reordering 3-2, Reordering-buffer-memory 6, as shown in FIG. It was decided to be divided into AM / UM5-2. As a result, since the parameters necessary for the concealment process can be extracted from the transport block within a certain time after receiving the transport block at the TTI interval, the concealment process in the receiving-side deciphering 5-1 is shown in FIG. In addition, it can be performed in real time in synchronization with the TTI. In particular, even when HSDPA is applied to data communication and a large amount of data stays in Reordering-buffer-memory 6 in reordering 3-2, the concealment process in deciphering 5-1 can be performed in real time. Therefore, processing congestion can be prevented and the required performance of the MAC 3 and RLC 5 can be suppressed, so that system performance such as communication throughput can be ensured at low cost.

  Next, the interface and memory configuration will be described. In FIG. 2, for example, Transport-Block-memory 2, RLC-PDU-memory 4 and Reordering-buffer-memory 6 are used as interfaces, but the configuration is not limited to using a memory. The same effects as described above can be obtained with other interfaces (for example, direct input / output via a signal line). The effect of using a memory will be described.

  First, the transport-block-memory 2 in a general MAC & RLC in a user terminal will be described with reference to FIG. PHY1 of L1 has a large amount of computation for channel decoding, and has a longer processing time than TTI. The processing time of PHY1 also depends on the amount of data to be received, and the timing at which PHY1 writes to Transport-Block-memory2 is not constant but distributed. Further, the processing time of the MAC 3 also depends on the amount of data to be received, and the time for reading from the Transport-Block-memory 2 is not always constant as described above, but is distributed.

  For this reason, the time for performing the write access to the Transport-Block-memory 2 and the time for performing the read access overlap (see FIG. 11). In such a case, simply, the Transport-Block-memory 2 is configured by a dual-port memory that can be accessed simultaneously from two directions, or by a two-plane memory that switches the writing surface and the reading surface at a TTI cycle. . When these methods are used, the size of Transport-Block-memory 2 is required to be at least twice the maximum amount of transport blocks to be recorded (in the case of dual ports, the corresponding mounting area).

  On the other hand, in the present embodiment, by adopting the configuration of FIG. 2, the disassembly 3-1 process is simpler than the entire MAC 3 process, so that the processing time can be shortened, and the PHY 1 processing time is the maximum. Even if it exists, disassembly 3-1 performs a process between the process of PHY 1 in the TTI and the process of PHY 1 in the next TTI, and the result can be easily realized in the RLC-PDU-memory 4. By executing disassembly 3-1 at such timing, it becomes possible to access Transport-Block-memory 2 by switching between writing and reading in a time-sharing manner. Therefore, the size of Transport-Block-memory 2 is It can be implemented with the maximum amount (× 1) of transport blocks to be recorded.

  Next, RLC-PDU-memory4, which is an interface between MAC3 and RLC5, will be described. MAC3 disassembles and separates the transport block for which order control has been completed and outputs it to RLC5. Therefore, the size of RLC-PDU-memory4 is N times the maximum amount of transport blocks (N is the reception of MAC-hs) (Window size) is required.

  Next, Reordering-buffer-memory will be described. For example, in the configuration of FIG. 10, a plurality of transport blocks are recorded in the Reordering-buffer-memory 6, and a plurality of RLC headers 101- 2 and payload 101-3 are recorded. In this way, the data structure to be recorded is different. The total size of Reordering-buffer-memory 6 and RLC-buffer-memory 7 needs to satisfy the ability defined by 3GPP. However, in the configuration of FIG. 10 having different data structures in Reordering-buffer-memory 6 and RLC-buffer-memory 7, each memory requires a capacity of the total size specified in 3GPP, and as a result, the specified capability Twice the size of the memory is required.

  On the other hand, in the present embodiment, by adopting the configuration of FIG. 2, the deciphering 5-1 synchronizes with the TTI for the concealment process for the payload 101-3 recorded in the RLC-PDU-memory 4 by the disassembly 3-1. The result can be recorded in the Reordering-buffer-memory 6 in real time. The deciphering 5-1 executes the concealment process at such timing, so that the size of the RLC-PDU-memory 4 can be implemented with the maximum amount of transport blocks (× 1).

  As described above, in the present embodiment, the disassembly 3-1 and the deciphering 5-1 are performed before the MAC3 reordering 3-2 process, and therefore the data structure handled by the reordering 3-2 and the data structure handled by the AM / UM5-2. Can be the same. Therefore, the Reordering-buffer-memory 6 and the RLC-buffer-memory 7 in FIG. 10 can be implemented as a shared memory. As a result, the shared memory (Reordering-buffer-memory 6 in FIG. 2) can be suppressed to a capacity defined by 3GPP.

Embodiment 2. FIG.
Next, L2 MAC & RLC in the second embodiment for realizing the confidential processing device according to the present invention will be described. FIG. 5 is a diagram showing the configuration of the UE and the detailed configuration of the MAC & RLC according to the present invention. Compared with FIG. 2 of the first embodiment, there is a key-stream-memory 5-3 for storing the KEY-STREAM-BLOCK calculated by the deciphering 5-1, and the RLC-PDU-memory 4 is accessed from the reordering 3-2. The point is different. Hereinafter, only operations different from those of the first embodiment will be described in detail.

  Here, the operation of the UE on the receiving side in the second embodiment will be described. FIG. 6 is a time chart showing the operations of the MAC 3 and the RLC 5 of the UE, which is different from the first embodiment in that the disassembly 3-1 and the deciphering 5-1 operate simultaneously. The relationship between the transport block that is the communication unit of PHY1 of L1 and the payload 101-3 that is the concealment target unit during HSDPA communication is as shown in FIG. 9, and the transport block includes a plurality of payloads 101- 3 is included.

  In disassembly 3-1 of MAC3, as in the first embodiment, the transport block is sequentially disassembled from the beginning of the data, and further separated into MAC header 101-1, RLC header 101-2, and payload 101-3. Is recorded in RLC-PDU-memory4. As an operation different from that of the first embodiment, the disassembly 3-1 extracts “RLC SN” included in the RLC header 101-2, and each time the extraction result is the size of the payload 101-3 ( This is synonymous with LENGTH) and notifies deciphering 5-1.

  In the deciphering 5-1 of the RLC 5, every time “RLC SN” is notified from the disassembly 3-1, the COUNT-C for each “RLC PDU” is calculated in combination with the HFN notified from the host controller. Next, KEY-STREAM-BLOCK is calculated by inputting the calculated COUNT-C, CK, BEARER and DIRECTION notified from the host controller, and LENGTH notified from disassembly 3-1, and the result is calculated as key-stream. -Record in memory 5-3. At this time, the bit arrangement of KEY-STREAM-BLOCK is set to be the same as that of the corresponding payload 101-3. Since the transport block includes a plurality of “RLC PDUs”, extraction of “RLC SN” by disassembly 3-1 and calculation of KEY-STREAM-BLOCK by deciphering 5-1 can be processed in parallel at the same time. . Therefore, as shown in the operation example of FIG. 6, the deciphering 5-1 can start the operation before the disassembly 3-1 completes the recording in the RLC-PDU-memory 4. Further, the deciphering 5-1 notifies the reordering 3-2 of the end of processing when the calculation of the KEY-STREAM-BLOCK corresponding to all the payloads 101-3 included in the transport block is completed.

  In the concealment process according to the present embodiment, an exclusive OR of the payload 101-3 recorded in the RLC-PDU-memory 4 and the KEY-STREAM-BLOCK recorded in the key-stream-memory 5-3 is calculated. There is a need. Thus, in reordering 3-2, when the end of processing is notified from deciphering 5-1, the payload 101-3 recorded in RLC-PDU-memory 4 and the key-stream-memory 5-3 corresponding to the payload 101-3 are sent to The recorded KEY-STREAM-BLOCK is read, the exclusive OR of these is calculated, and the calculation result is recorded in the reordering-buffer-memory 6.

  As described above, in the present embodiment, as shown in FIG. 5, the functions of MAC3 and RLC5 are extracted as “RLC SN” included in RLC header 101-2 and the result is notified to deciphering 5-1 Disassembly 3-1 with the added function and a function to calculate KEY-STREAM-BLOCK every time "RLC SN" is notified from disassembly 3-1, and record the result to key-stream-memory 5-3 deciphering 5-1, key-stream-memory 5-3 for storing KEY-STREAM-BLOCK calculated by deciphering 5-1, payload 101-3 recorded in RLC-PDU-memory 4, and key-stream corresponding to the payload -Reading KEY-STREAM-BLOCK recorded in memory-5-3, calculating the exclusive OR of them, and dividing the result into reordering 3-2 having the function of recording the result in reordering-buffer-memory 6 It was decided to realize. Thereby, as shown in FIG. 6, the disassembly 3-1 and the deciphering 5-1 can operate simultaneously in parallel, and as a result, the processing time of the MAC 3 and the RLC 5 can be shortened.

  In this embodiment, key-stream-memory 5-3 is provided to simplify the interface, and reordering 3-2 is configured to execute exclusive OR, which is a part of the concealment process. For example, without providing the key-stream-memory 5-3, the exclusive OR of the payload 101-3 recorded in the RLC-PDU-memory 4 and the KEY-STREAM-BLOCK corresponding to the payload is obtained in the deciphering 5-1. Even when the calculation is performed and the calculation result is recorded in the reordering-buffer-memory 6, the processing time can be shortened in the same manner.

Embodiment 3 FIG.
In the third embodiment, the structure of data recorded in the RLC-PDU-memory 4 and the reordering-buffer-memory 6 is defined. FIG. 4 is a diagram showing the structure of data recorded in the RLC-PDU-memory 4 and the reordering-buffer-memory 6, and more specifically, before and after performing the above-described concealment processing, the RLC-PDU-memory 4 and the reordering-buffer The data structure of the MAC header 101-1, RLC header 101-2, and payload 101-3 recorded in -memory6 is shown. Note that the configuration of the UE and the detailed configuration of the MAC & RLC according to the present invention are the same as those in FIG. 2 or FIG. 5 described above.

  Payload 101-3, which is a confidential processing unit, is arranged in accordance with the word length of the memory. The RLC header 101-2 is arranged at an address different from that of the payload 101-3. The MAC header 101-1 is arranged at an address different from the payload 101-3 and the RLC header 101-2.

  Further, the order of the MAC header 101-1, RLC header 101-2, and payload 101-3 is maintained in the order included in the transport block shown in the data flow of FIG. 7 or FIG. From 3GPP TS25.321 and TS25.322, the sizes (bit widths) of the MAC header 101-1, RLC header 101-2, and payload 101-3 are variable and are determined for each communication negotiation.

  When the sizes of the MAC header 101-1, the RLC header 101-2, and the payload 101-3 do not match the integral multiple of the word length of the memory, respectively, the MAC header 101-1, the RLC header 101-2, and the payload A blank is inserted between 101-3.

Next, the following processes (a), (b), and (c) will be described in detail based on the data structure defined above. Here, the following processes (a), (b), and (c) shown in FIG.
(A) Decomposing the transport block into “MAC PDU” (b) Separating “MAC PDU” into MAC header 101-1 and “RLC PDU” (c) RLC header 101-2 and payload Separated into 101-3

  For example, in the case of HSDPA communication, the disassembly 3-1 knows the total size of the MAC header 101-1 and the “RLC PDU” that are the structure of the “MAC PDU” by analyzing the MAC-hs header of FIG. Further, the disassembly 3-1 is notified of the size of the MAC header 101-1 from the host controller, and is notified of the size of the RLC header 101-2 from the RLC 3.

  Then, the disassembly 3-1 scans the transport block from the top, and from the head of the data excluding the MAC-hs header, the data corresponding to the size of the MAC header 101-1 notified from the host controller is RLC-PDU-memory4. To record. When the size of the MAC header 101-1 does not match the integer multiple of the word length of the RLC-PDU-memory 4, the blank and the MAC are recorded by recording the MAC header 101-1 in the RLC-PDU-memory 4 after inserting the blank. Adjustment is made so that the total size of the header 101-1 is an integral multiple of the word length of the RLC-PDU-memory4.

  Next, the disassembly 3-1 records data for the size of the RLC header 101-2 notified from the RLC 5 in the RLC-PDU-memory 4 from the continuation of the transport block. If the size of the RLC header 101-2 does not fit an integer multiple of the word length of the RLC-PDU-memory4, the blank and the RLC are recorded by recording the RLC header 101-2 in the RLC-PDU-memory4 after inserting the blank. The total size of the header 101-2 is adjusted to be an integer multiple of the word length of RLC-PDU-memory4.

  Next, the disassembly 3-1 records data for the size of the payload 101-3 notified from the RLC 5 in the RLC-PDU-memory 4 from the continuation of the transport block. When the size of the payload 101-3 does not match the integer multiple of the word length of the RLC-PDU-memory4, a blank is inserted after the payload 101-3 is recorded in the RLC-PDU-memory4. Is adjusted so that the total size of RLC-PDU-memory4 is an integral multiple of the word length of RLC-PDU-memory4.

  Further, the disassembly 3-1 repeats the processes of the MAC header 101-1, RLC header 101-2, and payload 101-3 from the continuation of the transport block, thereby performing all the MAC headers included in the transport block. 101-1, RLC header 101-2 and payload 101-3 are disassembled and separated, and the respective results are recorded in RLC-PDU-memory 4 in the format shown in FIG.

  As a result, when the deciphering 5-1 performs the concealment process on the payload 101-3 recorded in the RLC-PDU-memory 4, the payload 101-3 is arranged in accordance with the word length. An exclusive OR of the payload 101-3 and KEY-STREAM-BLOCK can be easily calculated.

  As described above, in this embodiment, the disassembly 3-1 matches the MAC header 101-1, the RLC header 101-2 and the payload 101-3 to be concealed with the memory word length as described above. Decided to place. Thereby, the deciphering 5-1 can execute an exclusive OR operation between the payload 101-3 recorded in the RLC-PDU-memory 4 and the KEY-STREAM-BLOCK at a high speed in units of words.

  Further, since the data structure of RLC-PDU-memory 4 before the concealment process and the data structure of reordering-buffer-memory 6 after the concealment process are made common, RLC-deciphering 5-1 includes a MAC header 101-1, an RLC header. Processing for recording 101-2 and the payload 101-3 after concealment processing into the reordering-buffer-memory 6 can be executed at high speed without bit shift.

  As described above, the confidential processing device according to the present invention is useful for a user terminal that realizes the confidential processing specified by 3GPP and a communication system including the user terminal, and in particular, executes the confidential processing in real time. Therefore, it is suitable for a user terminal that improves system performance.

It is a figure which shows the outline | summary of the protocol stack by 3GPP specification. It is a figure which shows the structure of UE, and the detailed structure of MAC & RLC concerning this invention. It is a time chart which shows operation | movement of MAC and RLC. It is a figure which shows the structure of the data recorded on RLC-PDU-memory and reordering-buffer-memory. It is a figure which shows the structure of UE, and the detailed structure of MAC & RLC concerning this invention. It is a time chart which shows operation | movement of MAC and RLC. It is a figure which shows the data flow between the protocols in UE side in case it is not HSDPA communication prescribed | regulated by 3GPP. It is a figure which shows the concealment process with respect to the transmission data prescribed | regulated by 3GPP, and reception data. It is a figure which shows the data flow between the protocols in the UE side in the case of HSDPA communication prescribed | regulated by 3GPP. It is a figure which shows the structure of general MAC & RLC in a user terminal. It is a time chart which shows the operation | movement of general MAC & RLC in UE.

Explanation of symbols

1 PHY
2 Transport-Block-memory
3 MAC
3-1 disassembly
3-2 reordering
4 RLC-PDU-memory
5 RLC
5-1 deciphering
5-2 AM / UM
5-3 key-stream-memory
6 Reordering-buffer-memory
101-1 MAC header 101-2 RLC header 101-3 Payload

Claims (8)

MAC (Medium Access Control) that receives a transport block at a transmission time interval, extracts parameters necessary for concealment processing within a predetermined time from the transport block, and performs concealment processing on the receiving side using the extraction result; In a confidential processing device using RLC (Radio Link Control),
A MAC first step of separating and disassembling the transport block into a MAC header, an RLC header and a payload at a timing synchronized with the transmission time interval;
KEY-STREAM-BLOCK is calculated by a known process recommended in the 3GPP standard at the timing synchronized with the time when the first step is completed, and the exclusive OR of the payload and the KEY-STREAM-BLOCK is calculated. A second step by RLC that performs a concealment process on the payload by calculating;
A third step by the MAC that performs order control in units of transport blocks on the payload decoded by the MAC header, the RLC header and the concealment process at a timing synchronized with the time when the second step is completed;
A fourth step by the RLC that executes the RLC function recommended in the 3GPP standard other than the confidential processing;
A concealment processing device comprising: The transport block received at the transmission time interval is recorded in a first memory capable of recording the maximum amount of the transport block,
2. The concealment processing device according to claim 1, wherein in the first step, the separation and disassembly processing is performed using a transport block recorded in the first memory. In the first step, a second memory capable of recording the MAC header, the RLC header, and the payload obtained as a result of the separation and disassembly processing by N (arbitrary natural number) times the maximum amount of the transport block. Recorded in
The cipher processing apparatus according to claim 1, wherein in the second step, cipher processing is performed on a payload recorded in the second memory. In the second memory,
The MAC header, RLC header and payload are arranged at different addresses, respectively.
Also, the payload is divided and arranged for each memory word length,
Furthermore, when the MAC header, the RLC header, and the payload do not match an integer multiple of the word length of the memory, blanks are inserted into the empty areas of the addresses, respectively. In the third step, the MAC header, RLC header and post-order control payload are recorded in a third memory capable of recording the maximum amount of the transport block,
5. The concealment processing device according to claim 1, wherein in the fourth step, an RLC function is executed using information recorded in the third memory. In the third memory,
The MAC header, RLC header and payload are arranged at different addresses, respectively.
Also, the payload is divided and arranged for each memory word length,
Furthermore, when the MAC header, the RLC header, and the payload do not match an integral multiple of the word length of the memory, blanks are inserted in the empty areas of the addresses, respectively. In the first step, “RLC SN” included in the RLC header is further extracted,
In the second step, the KEY-STREAM-BLOCK is calculated using the “RLC SN”, the result is recorded in a fourth memory, and the concealment process for the payload is not performed.
In the third step, the payload is concealed by calculating an exclusive OR of the payload and the KEY-STREAM-BLOCK recorded in the fourth memory, and then the order control is performed. The concealment processing device according to claim 1, wherein the concealment processing device is performed. MAC (Medium Access Control) that receives a transport block at a transmission time interval, extracts parameters necessary for concealment processing within a predetermined time from the transport block, and performs concealment processing on the receiving side using the extraction result; In the confidential processing method by RLC (Radio Link Control),
A MAC first step of separating and disassembling the transport block into a MAC header, an RLC header and a payload at a timing synchronized with the transmission time interval;
KEY-STREAM-BLOCK is calculated by a known process recommended in the 3GPP standard at the timing synchronized with the time when the first step is completed, and the exclusive OR of the payload and the KEY-STREAM-BLOCK is calculated. A second step by RLC that performs a concealment process on the payload by calculating;
A third step by the MAC that performs order control in units of transport blocks on the payload decoded by the MAC header, the RLC header and the concealment process at a timing synchronized with the time when the second step is completed;
A fourth step by the RLC that executes the RLC function recommended in the 3GPP standard other than the confidential processing;
A concealment processing method comprising:

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