JP2010541463A - CS service providing method using HSDPA or HSUPA - Google Patents

Abstract

An object of the present invention is to provide a method for efficiently transmitting data generated by a CS service using a PS network or a wireless protocol that supports only the PS service. The present invention relates to a wireless communication system and terminal for providing a wireless communication service, and a PDCP entity operating method in UMTS, and more particularly, to each data received at a receiving side as a method of providing a CS service using HSDPA or HSUPA technology. The present invention relates to an operation method in which a transmission side includes a CFN in a data block for transmission in order to process the block in accordance with a reference time.

Description

  The present invention relates to a wireless communication system and a terminal that provide a wireless communication service, and a PDCP (Packet Data Convergence Protocol) entity operation method in UMTS (Universal Mobile Telecommunications System), and in particular, HSDPA (High Speed Acc. As a method of providing a CS (Circuit Switched) service using the (High Speed Uplink Packet Access) technology, in order for the receiving side to process each received data block in accordance with the reference time, the transmitting side includes CFN ( Connection Frame Number) The present invention relates to an operation method including transmission.

  FIG. 1 is a diagram illustrating an example of a UMTS network structure. A UMTS system includes a terminal (User Equipment; UE), a UMTS radio access network (UMTS Terrestrial Radio Access Network; UTRAN), and a core network (Core Network; CN). The UTRAN is composed of at least one radio network subsystem (RNS), and each RNS has one radio network controller (RNC) and one managed by the RNC. It is comprised from the above base stations (Node B). One Node B has one or more cells.

  FIG. 2 is a diagram illustrating an example of a structure of a radio protocol used in UMTS. The wireless protocol layer exists in pairs between the terminal and the UTRAN, and is responsible for data transmission in the wireless section. Each wireless protocol layer will be described as follows. First, the physical layer (first layer) plays a role of transmitting data in a wireless section using various wireless transmission technologies. The physical layer is connected to an upper layer MAC (Medium Access Control) layer via a transport channel, and the transport channel depends on whether the channel is shared or not, depending on whether the channel is shared or not. And divided.

  The second layer includes a MAC layer, an RLC (Radio Link Control) layer, a PDCP layer, and a BMC (Broadcast / Multicast Control) layer. First, the MAC layer plays a role of mapping various logical channels to various transport channels, and also plays a role of logical channel multiplexing for mapping various logical channels to one transport channel. The MAC layer is connected to the upper layer RLC layer via a logical channel, and the logical channel is a traffic that transmits control plane information and user plane information depending on the type of information transmitted. Divided into channels. The MAC layer is divided into a MAC-b sublayer, a MAC-d sublayer, a MAC-c / sh sublayer, a MAC-hs sublayer, and a MAC-e sublayer according to the type of transport channel to be managed. The MAC-b sublayer manages a BCH (Broadcast Channel) that is a transport channel responsible for broadcasting system information, and the MAC-c / sh sublayer is a FACH (Forward Access Channel) or DSCH shared by a plurality of terminals. A common transport channel such as (Downlink Shared Channel) is managed, and the MAC-d sublayer manages a dedicated transport channel DCH (Dedicated Channel) for a specific terminal. In order to support downlink / uplink high-speed data transmission, the MAC-hs sublayer manages HS-DSCH (High Speed Downlink Shared Channel), which is a transport channel for high-speed downlink data transmission. -E sublayer manages E-DCH (Enhanced Dedicated Channel), which is a transport channel for high-speed uplink data transmission.

  The RLC layer is responsible for QoS (Quality of Services) required by each radio bearer (RB) and data transmission based on the guarantee. Each RB has one or two independent RLC entities to ensure RB-specific QoS, and the RLC layer is transparent mode (Transparent Mode; TM), non-transparent to support various QoS. Three operation modes are provided: an acknowledged mode (UM) and an acknowledged mode (AM). Further, the RLC layer performs a function of dividing and concatenating data received from the upper layer in order to adjust the data size so as to be suitable for data transmission in the radio section in the lower layer.

  The PDCP layer is positioned above the RLC layer, and unnecessary control information is transmitted so that data transmitted using IP packets such as IPv4 and IPv6 can be efficiently transmitted in a wireless section with a relatively small bandwidth. The header compression function to reduce is executed, but such header compression improves the transmission efficiency of the radio section by transmitting only the essential information in the header portion of the data. Since the header compression function is a basic function, the PDCP layer exists only in the PS (Packet Switched) domain, and one PDCP entity exists in each RB to provide an effective header compression function for each PS service. To do.

  The BMC layer of the second layer is located above the RLC layer, schedules a cell broadcast message (CB Message), and broadcasts the CB message to terminals located in one or more specific cells. Perform the function.

  The RRC (Radio Resource Control) layer located at the bottom of the third layer is defined only in the control plane, and controls the parameters of the first and second layers in connection with the setting, reconfiguration, and release of the RB. Responsible for control of logical channels, transport channels, and physical channels. Here, RB means a logical path provided by the first and second layers of the radio protocol for data transmission between the mobile terminal and the UTRAN. In general, RB configuration refers to a process of defining characteristics of a radio protocol layer and a channel necessary for providing a specific data service, and setting detailed parameters and operation methods of each.

  In WCDMA (Wideband Code Division Multiple Access) systems, HSDPA and HSUPA technologies are introduced. These two technologies were introduced specifically to efficiently support PS services. HSDPA and HSUPA are integrated into HSPA.

  The CS system is a system for exchanging data by setting a communication line between a transmission side and a reception side. In such a CS system, a dedicated communication path is provided in advance between two stations that wish to communicate, and this dedicated communication path is composed of links that connect nodes continuously. Each physical link is connected to one channel and is suitable for data exchange that requires a relatively continuous flow, such as telephones, sensors, telemetry inputs, etc., and is easily used. The CS method is a method of transmitting via a set communication line during data transmission, and is suitable for transmission of a long message such as when the amount of data is large or file transmission. Time division circuit switching is very efficient for high-quality, high-speed data transmission because digital switching technology and pulse code modulation multiplexing technology in digital communication channels are used. In this method, a physical line is fixedly allocated between two end points. Therefore, the transmission delay from the data generation time to the data transmission start time can be minimized. Further, since a fixed line is used, there is no transmission order reversal phenomenon in each data.

  In the PS method, a data transmission unit in a packet format having a predetermined length is stored in a transmission side packet switch, and an appropriate communication path is selected according to a reception side address and transmitted to the reception side packet switch. This is an exchange method. In the PS system, data is transmitted in units of short data blocks called packets. In general, the packet length is limited to about 1000 bytes. Each packet includes a part indicating user data and a part indicating packet control information. Here, the packet control information should include at least information necessary for setting the packet path in the network so that the packet reaches the receiving side. When a packet is received by each node via a transmission path, the packet is stored and then transmitted to the next node. Such storage process and transmission process to the next node are repeated until the packet reaches the receiving side. In this method, a specific terminal does not continuously occupy a specific route but occupies and uses it only when necessary, so that line utilization efficiency is maximized. In addition, since each data unit may be transmitted through a different route, the transmission delay amount in each data is also different.

  In recent years, mobile communication services have been developed to support packet services such as Internet browsing as efficiently as possible. Among them, the most important service in mobile communication is a voice call service, which is mainly provided by the CS service.

  Currently, the UMTS system is based on the R99 version of WCDMA optimized for CS services and further introduces R5 HSDPA and R6 HSUPA to support PS services. That is, current systems support both CS networks for CS services and PS networks for PS services. However, from the standpoint of operating the network, this causes the problem of cost burden that both the CS network and the PS network must be installed, and the problem that each network must be managed independently.

  In order to solve such a problem, it is expected that the support for the CS network is gradually reduced and only the PS network is operated. For this purpose, a method for replacing all CS services with PS services and a method for efficiently providing CS services over a PS network are required.

  In particular, there is a need for a method of supporting CS voice service, which is a representative CS service, with a PS network, that is, an HSPA network using HSDPA and HSUPA technologies.

  Therefore, an object of the present invention is to provide a method for efficiently transmitting data generated by a CS service using a PS network or a wireless protocol that supports only the PS service.

  In order to achieve such an object, the present invention receives at least one service data unit (SDU) from an upper layer and generates a protocol data unit (PDU). Providing a data providing method in a wireless communication system, comprising: adding a header including time information to the received at least one service data unit; and transmitting the generated protocol data unit to a lower layer. To do.

  The time information is preferably CFN.

  The time information is preferably added to the header of the PDCP layer.

  The time information is preferably added to the header of the MAC layer.

  The time information is preferably a CS counter.

  The time information is preferably related to CFN.

  The data is preferably provided in a PS service or a CS service.

  Preferably, the upper layer is an RLC entity and the lower layer is a physical entity.

It is a figure which shows an example of the network structure of E-UTRAN (Evolved Universal Terrestrial Radio Access Network) which is a mobile communication system to which a prior art and this invention are applied. It is a figure which shows an example of the structure of the radio | wireless protocol used by UMTS. It is a figure which shows an example of CS system and PS system for data exchange between the transmission side and the reception side. It is a figure which shows an example of the method of applying CS service to HSPA infrastructure technology. It is a figure which shows an example of the data block produced | generated by the MAC entity. It is a figure which shows an example of the indicator called the "subflow combination index (subflow combination index)" contained in the protocol data unit (PDU) by this invention. It is a figure which shows an example of the format of the protocol data unit when the multiplexing of a subflow is performed by this invention. FIG. 4 is a diagram illustrating an example of a PDCP structure related to a subflow multiplex according to the present invention.

  One aspect of the present invention is based on the knowledge of the present inventors regarding the problems and disadvantages of the prior art described above, and will be described in more detail below. The present invention has been completed based on such findings.

  The present invention is applied to 3GPP communication technology, in particular, a UMTS system, a communication device, and a communication method. However, the present invention is not limited to this, and can be applied to all wired and wireless communications to which the technical idea of the present invention can be applied.

  The basic concept of the present invention is to provide a data providing method in a wireless communication system and a wireless mobile communication terminal or network capable of realizing the method, the method comprising at least one service data unit ( Receiving a SDU) from an upper layer, adding a header including time information to the received at least one service data unit to generate a protocol data unit (PDU), and the generated protocol data Transmitting the unit to a lower layer.

  As described above, the present invention provides a method for efficiently transmitting data generated by a CS service using a PS protocol or a wireless protocol supporting only the PS service. In particular, the present invention provides time for data of the CS service in order to maintain the order of data generated in the CS service and solve the problem due to different transmission delay times that occur in the data transmission process of the CS service. It is proposed to transmit including information.

  More specifically, when a certain protocol entity receives a service data unit (SDU) from a CS service application, the protocol entity processes the SDU and then processes a protocol data unit (PDU). ) To a lower protocol entity. The present invention proposes to include time information about the SDU or PDU in the PDU. Here, the protocol entity may be a PDCP entity, an RRC entity, an RLC entity, or a MAC entity. The time information may be information regarding CFN, part of CFN, or CFN. The time information may indicate a time or CFN when the SDU is generated, and may indicate information related thereto. The time information may indicate a time or CFN when the PDU is generated, and may indicate information related thereto. Further, the time information may indicate a time or CFN when the transmission side receives the SDU from an upper layer, or may indicate information related thereto. The time information may indicate a time or CFN at which the receiving side should process the SDU or PDU, or information related thereto. Further, the time information may indicate a time or CFN when the transmission side processes the SDU or PDU, or may indicate information related thereto. The time information may indicate a time or CFN when the receiving side transmits the SDU or PDU to an upper layer, or may indicate information related thereto. Further, the time information may indicate a time when the transmitting side encrypts the SDU or PDU, a CFN, or a sequence number applied in the encryption process, or information related thereto. The time information may indicate a time at which the receiving side should decode the SDU or PDU, a CFN, or a sequence number to be applied in the decoding process, or information related thereto. Further, the time information may be a CS counter, and the value of the CS counter may be set from the first LSB to the fifth LSB of the CFN in a packet received from an upper layer.

  The configuration and operation of a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

  First, CFN related to the present invention will be described. CFN is time information managed by a base station and a terminal in an RRC connection state. The CFN is uniquely set for each terminal, and may be a reference for data generation time or data processing time. The CFN may be a sequence number value used when the MAC entity encrypts or decrypts the MAC SDU. Furthermore, CFN increases with time. For example, if CFN is 0 at 0.000 seconds, CFN is 1 at 0.020 seconds and CFN is 2 at 0.040 seconds. The CFN increases every time a predetermined time elapses regardless of whether there is data transmission at a certain point in time. In this case, the CFN is a value that increases every time a predetermined time elapses regardless of whether data is actually transmitted or received. The CFN field indicates the CFN in which the TM RLC PDU is processed by the MAC, and is used for encryption at the transmitting entity and a jitter removal process and decryption at the receiving entity.

  Such CFN information includes the time when the predetermined data is generated, the time when the predetermined data is received from the higher entity to the predetermined entity, the time when the predetermined data is transmitted to the lower entity, and the predetermined data as the upper entity. Means time information such as the time when the data is received or when the predetermined data is processed. The CFN can also be referred to as point-in-time information used to define an operation to be performed by a transmitting entity and a receiving entity at a predetermined time.

  FIG. 4 is a diagram illustrating an example of a method for applying the CS service to the HSPA infrastructure technology. As shown in FIG. 4, the MAC entity uses CFN related information according to the present invention. That is, in the present invention, unlike the prior art, the RLC TM mode for the CS scheme is used in the HSPA technique, and CFN related information is included in the MAC header of the MAC data block.

  In general, when a user equipment (or UE) moves from a non-HSPA cell to an HSPA cell, RB reconfiguration from RLC TM to RLC UM is required when CS user plane data is mapped to RLC UM. Here, the RB resetting can be performed using an RB release and RB setting message. The RNC needs to wait until it receives a radio bearer setup completion message (RB setup complete message) for obtaining a start value for encryption. In the present invention, it is proposed to map CS user plane data to RLC TM instead of RLC UM, so that it is not necessary to switch the RLC mode in the process of RB release and RB setting. Instead of switching the RLC mode, the RRC can reconfigure the transport channel type. With such a scheme, the handover process from a cell that is not an HSPA cell to an HSPA cell can be simplified. This scheme also allows for continuous switching between DCH and HSPA because it uses the same time reference.

  Encryption / decryption of CS user plane data for RLC TM to include CFN or CFN related information in the header of said MAC (MAC-hs, MAC-ehs, or E-DCH) TM mapped on HSPA Can be done at the MAC entity. It can also eliminate encryption desynchronization problems previously identified by lost packets or unrecognized errors when using RLC UM mode.

  FIG. 5 is a diagram illustrating an example of a data block generated by the MAC entity. Specifically, a PDU generated by MAC-d is shown. The MAC-d PDU includes a MAC header and a MAC service data unit (SDU), and the MAC SDU has various sizes. The size of the MAC SDU depends on the size of the RLC PDU defined during the setup process.

  The CFN shown in FIG. 5 means a CFN value at the time when the MAC-d PDU is generated, and can be used in the jitter removal process on the receiving side. Here, jitter refers to a phenomenon in which each data block generated continuously at a predetermined time interval does not arrive at the original generated time interval when it reaches the receiving side. In order to solve such a problem, the receiving side rearranges the received data blocks, and thereafter processes the rearranged data blocks one by one at a predetermined time interval. The present invention reorders the received PDUs according to the order of the CFN based on time information included in PDUs received by the receiving side, that is, CFN information, and performs predetermined time intervals based on the CFN values in the jitter removal process. It is proposed to process the PDU or the SDU included in the PDU. Here, a jitter removal buffer may be used for the jitter removal process. In the above process, only the part excluding CFN may be encrypted or decrypted. By the way, in the process, it may be wasteful to include all of the CFN in the MAC data block. For example, since audio data is generated every 20 ms, when CFN is 12 bits, the time corresponding to 81 seconds is covered. As described above, since a long CFN causes a waste of a radio section, in the process, only a part of the lower bits of the CFN are included in the MAC data block.

  The present invention also supports subflows according to the characteristics of the AMR codec. In 3GPP, a codec called “AMR” is used for CS voice service. In this AMR codec, the data rate of the codec used varies depending on radio conditions. In particular, the AMR codec generates three data subflows A, B, and C. Since the size of data generated every hour is different in each subflow, the transmitting side should effectively notify the receiving side of the amount of data generated in each subflow.

  Therefore, the present invention proposes to include an indicator called subflow combination index in the generated PDU. This is a value predetermined by the terminal and the base station, and plays a role of indicating the number of bits of each of the subflows A, B, and C included in the currently generated PDU. For example, the subflow combination index shown in FIG. 6 can be applied to the present invention. That is, each time a PDU is generated, the transmitting side checks the amount of data from each subflow included in each PDU, searches for an index suitable for the combination of the amount of data, and transmits the index included in the PDU. To do. After confirming the subflow combination index included in the received PDU, the receiving side extracts a number of bits corresponding to each subflow from the PDU according to the index instruction, and transmits it to each subflow.

  As another method, according to the combination of the number of bits per subflow currently defined and permitted by AMR, there is no index in which the sum of data corresponding to each subflow is the same in each combination. Therefore, using the index and the size of the received PDU, the data amount corresponding to each index and each subflow in the PDU can be obtained. Therefore, the present invention proposes that the number of bits specified in advance by the size of the PDU received by the receiving side is extracted from the PDU, and the extracted bits are transmitted to each subflow. In this case, only data is included in the PDCP PDU and there is no header. FIG. 7 is a diagram showing an example of a format of a protocol data unit when subflow multiplexing is performed according to the present invention. Here, the multiplexing of the subflow is performed in the PDCP entity.

  FIG. 8 is a diagram illustrating an example of a structure of a PDCP sublayer for a CS domain according to the present invention. When the PDCP of FIG. 8 is used for CS voice transmission, the PDCP is mapped to three TM bearers in each direction. FIG. 8 shows that the PDCP entity is multiplexing each subflow. Here, the multiplex is used when a CS service is connected to a PS-based radio technology such as HSDPA or HSUPA through a PDCP entity.

  Every CS domain RAB is associated with one PDCP entity. The PDCP entity is related to the number of TM mode RLC entities corresponding to the number of sub-flows of the RAB. The PDCP entity that supports the CS service does not use header compression.

  In the present invention, when a CS service is provided using HSDPA or HSUPA technology, the transmission side transmits the data block including the CFN in the data block so that the reception side processes each received data block in accordance with the reference time. By providing the operation method, there is a great effect that the CS service can be supported more efficiently in the HSPA network.

  The present invention includes receiving at least one service data unit (SDU) from an upper layer, and generating a protocol data unit (PDU) with a header including time information in the received at least one service data unit. A method for providing data in a wireless communication system is provided that includes adding and transmitting the generated protocol data unit to a lower layer. Here, the time information is CFN and is added to the header of the PDCP layer. The time information is added to the header of the MAC layer. The time information is a CS counter and is related to CFN. The data is provided in a PS service or a CS service. The upper layer is an RLC entity, and the lower layer is a physical entity.

  Although the present invention has been described in the context of mobile communications, it can be used in any wireless communication system that uses mobile devices such as PDAs and laptop computers with wireless communication capabilities (ie, interfaces). In addition, the specific terms used to describe the present invention are not intended to limit the scope of the present invention to a particular type of wireless communication system. The present invention can also be applied to other wireless communication systems using various air interfaces and / or physical layers such as TDMA, CDMA, FDMA, WCDMA, OFDM, EV-DO, Wi-Max, Wi-Bro. .

  The present embodiment can be realized as a manufacturing method, a manufacturing apparatus, or a product using standard programming and / or engineering technology for producing software, firmware, hardware, or a combination thereof. Here, the term “product” refers to hardware logic (for example, an integrated circuit chip, Field Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC)), or a computer readable medium (for example, a magnetic recording medium (for example, a magnetic recording medium) For example, hard disk drive, floppy (registered trademark) disk, tape, etc.), optical recording device (CD-ROM, optical disk, etc.), volatile and nonvolatile memory devices (eg, EEPROM, ROM, PROM, RAM, DRAM, SRAM, Code, logic executed in firmware, program logic, etc.)).

  Code in the computer readable medium is accessed and executed by a processor. The code executed in the present embodiment can be accessed via a transmission medium or from a file server on a network. In that case, the code-executed product includes a transmission medium such as a network transmission line, a wireless transmission medium, a signal propagating in the air, a radio wave, and an infrared signal. Of course, a person having ordinary knowledge in the technical field can make various changes in the configuration without departing from the gist of the present invention, and the product is a known information bearing medium. Will also be understood to include.

  References herein to “one embodiment,” “an embodiment, example embedment,” and the like refer to specific features, structures, or features described in connection with the above embodiments. It is meant to be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. In addition, when a particular characteristic, structure, or feature is described in connection with any embodiment, such characteristic, structure, or feature may be recognized by those skilled in the art in other embodiments of this embodiment. It can also be achieved in conjunction.

  Although the present invention has been described with reference to several embodiments, those skilled in the art will recognize that various other modifications and embodiments are possible within the spirit and scope of the principles of the invention. . In particular, various changes and modifications may be made in the component parts and / or the subject combination arrangement within the specification, drawings, and appended claims. In addition to the component parts and / or structural changes and modifications, alternative uses will be apparent to those skilled in the art.

  The present invention can be realized in various forms as long as it does not depart from the concept and basic characteristics of the present invention, and the above embodiment is not limited by any detailed description, and is attached unless otherwise specified. It should be construed broadly within the spirit and scope defined in the claims, and all changes and modifications made within the scope of the claims of the present invention and equivalents thereof are included in the scope of the claims of the present invention.

Claims (8)

Receiving at least one service data unit (SDU) from an upper layer;
Adding a header including time information to the received at least one service data unit to generate a protocol data unit (PDU);
And transmitting the generated protocol data unit to a lower layer.   The method for providing data in a wireless communication system according to claim 1, wherein the time information is CFN.   The method according to claim 1, wherein the time information is added to a header of the PDCP layer.   The method according to claim 1, wherein the time information is added to a header of a MAC layer.   The method for providing data in a wireless communication system according to claim 1, wherein the time information is a CS counter.   The method of providing data in the wireless communication system according to claim 1, wherein the time information is related to CFN.   The method of claim 1, wherein the data is provided in a PS service or a CS service.   The method according to claim 1, wherein the upper layer is an RLC entity, and the lower layer is a physical entity.

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