Method for avoiding collision using identifier in mobile network

How to use identifiers on mobile networks to avoid collisions

The present invention relates to a mobile network. Specifically, it relates to a method for avoiding collisions between transmissions in a mobile network.

The third generation partnership project (3GPP) mobile system based on wideband code division multiple access (WCDMA) radio access technology has been widely developed around the world . As the first step in the evolution of WCDMA, a high-speed downlink packet access (HSPDA) technology provides 3GPP with a highly competitive radio reading technology. However, as wireless access technologies continue to develop in response to the needs and expectations of users and suppliers, the evolution of new technologies in 3GPP is still needed to improve competitiveness.

Therefore, in order to develop wireless transmission technologies that can significantly reduce costs and provide high-quality services at the same time, "Evolved UTRA and UTRAN" (Evolved UTRA and UTRAN) has been studied for this purpose. The long-term evolution (LTE) of the third-generation mobile network (3G) is dedicated to reducing costs for users and suppliers, as well as improving service quality, while expanding coverage and improving system capacity. 3G LTE needs to reduce the cost per bit, increase service availability, flexible use of frequency bands, simple structure and open interface, and appropriate power consumption of a terminal as required by a higher layer.

Usually, a Node-B (Node-B) is set in a cell. Multiple user equipment (UE) can be located in one cell. The user equipment must execute a random access procedure to access the network.

Figure 1 is a block diagram illustrating a communication network, such as the network structure of an evolved universal mobile telecommunication system (E-UMTS). The E-UMTS can also be referred to as an LTE system. The communication network has been widely set up to provide a variety of communication services, such as voice and packet data.

As illustrated in Figure 1, the E-UMTS includes an evolved UMTS terrestrial radio access network (E-UTRAN) and a core network (CN). The E-UTRAN may include one or more evolved Node-B (evolved Node-B, eNode-B) 20. The CN may include a node for registering users of a user equipment (UE) 10 and one or more E-UTRAN access gateways (access gateway, AG) located at the end of the network and connected to the external network. )30.

As used below, "downlink" refers to the communication from an eNode-B 20 to the UE 10; "uplink" refers to the communication from an eNode-B 20 to the eNode-B. "UE" refers to the communication equipment carried by the user. It can also refer to a mobile station (MS), a user terminal (UT), a subscriber station (SS), or a Wireless device.

An eNode-B 20 provides the UE 10 with a user plane and a control plane end. An AG 30 provides the end of a connection period and the mobile management function for the UE 10. An eNode-B 20 and an AG 30 can be connected via an S1 interface.

An eNode-B 20 is usually a fixed station for communicating with the UE 10. It may also be called a base station (BS) or an access point. Each cell can be configured with an eNode-B 20. An interface can be used between the eNode-B 20 to transmit user traffic or control traffic.

An AG 30 may also be called a mobility management entity/user plane eneity (MME/UPE). An AG 30 can be classified into a part for executing user communication procedures and a part for executing control communication procedures. A new interface can be used to perform a new communication between the AG 30 used to execute user communication procedures and the AG used to execute control communication procedures.

An interface can be used to distinguish E-UTRAN from CN. A plurality of nodes can be connected between an eNode-B 20 and an AG 30 through the S1 interface. The eNode-Bs 20 can be connected to each other via an X2 interface, and neighboring eNode-Bs 20 can have a meshed network structure with an X2 interface at any time.

The radio interface protocol (radio interface protocol) layer between UE 10 and the network can be classified as the first layer according to the three lower layers in the well-known open system interconnection (OSI) reference model in communication networks (L1), the second layer (L2), and the third layer (L3). The physical layer belonging to the first layer provides information transmission services using physical channels. The radio resource control (RRC) layer belonging to the third layer provides services for controlling radio resources between the UE 10 and the network. The UE and the network exchange RRC information via the RRC layer.

The RRC layer can be located in a network node of an eNode-B 20 or AG 30. Another alternative is that the RRC layer can be located in an eNode-B 20 or AG 30.

The radio interface protocol horizontally includes a physical layer, a data link layer, and a network layer; vertically, it includes a user plane for transmitting data information and a control plane for transmitting control signals. Figure 2 is a block diagram to illustrate the control plane of the radio interface protocol. Figure 3 is a block diagram to illustrate the user plane of the radio interface protocol. Figures 2 and 3 illustrate the structure of the radio interface protocol between UE 10 and E-UTRAN based on a radio access network standard.

As shown in Figures 2 and 3, the physical layer uses a physical channel to provide information transmission services to the upper-level layer. The physical layer is connected to a medium access control (MAC) layer via a transport channel, and the MAC layer is an upper layer.

Data is transmitted between the MAC layer and the physical layer through the transport channel. Data is transmitted between different physical layers via a physical channel, for example, between the physical layer of a transmitter and the physical layer of a receiver.

The MAC layer belonging to the second layer provides services via a logical channel to a radio link control (RLC) layer which is the upper layer. The RLC layer belonging to the second layer supports reliable data transmission. We should note that the RLC layer is represented by a dotted line in the figure, because if the RLC functions are implemented in the MAC layer and executed by the MAC layer, the RLC layer itself does not need to exist.

Because the Internet Protocol (IP) packet header contains unnecessary control information and has a relatively large size, in order to reduce the size of the Internet Protocol packet header, it belongs to the second layer of the packet. The data convergence protocol (packet data convergence protocol, PDCP) layer performs header compression. In this way, when an IP packet is transmitted, such as an IPv4 packet or an IPv6 packet, it can promote effective transmission of the packet in a radio zone with a narrow bandwidth.

The Radio Resource Control (RRC) layer, which belongs to the third layer, is defined as being only in the control plane. The RRC layer can be used to control the configuration, reconfiguration and release of logical channels, transportation channels, and physical channels of radio bearers. Radio transmission is a service provided by the second layer between UE 10 and E-UTRAN by supplying data transmission.

The transport channel used to transmit data from the network to UE 10 includes a broadcast channel (BCH) that transmits system information and a shared channel (SCH) that transmits user traffic or control information. With shared control channel (shared control channel, SCCH). The flow or control information of a downlink multicast service or broadcast service can be transmitted via a downlink SCH or an additional multicast channel (multicast channel, MCH).

The uplink transport channel that transmits data from the UE 10 to the network includes a random access channel (RACH) that transmits start control information and a shared channel (SCH) that transmits user traffic or control information. ) And shared control channel (shared control channel, SCCH). Here, the random access channel from the UE 10 transmitting the start control information to the network will be described.

The random access program is executed via a random access channel (RACH), which is an on-chain transport channel. The user equipment transmits initial control information to the network via the RACH. The RACH is used to synchronize the user terminal equipment with the network, and is used to obtain radio resources when the user equipment needs to transmit data but cannot obtain the uplink radio resources of the transmitted data.

Through the RACH, more than one user equipment can try to obtain the same radio resource. When this happens, more than one user equipment can use the same radio resource to transmit information at the same time. Such information may collide with each other and may cause transmission failure.

After a preset period of time, the user equipment that fails to transmit information will use RACH again. Data transmission time will be significantly increased due to collisions, and radio resources may be wasted due to re-access.

One of the objects of the present invention is to provide a method for using identifiers in mobile networks to avoid collisions during transmission from user equipment.

One aspect of the present invention is to provide a method of information dissemination in a mobile communication system. The method includes transmitting a preamble via a random access channel (RACH) and receiving a response to the preamble. The response includes an identifier and an indicator. The identifier is generated according to the preamble, and the indicator The symbol system corresponds to the identifier and uses the identifier and indicator to transmit data.

After consideration, the identifier includes one of the following: a random identifier (random Id), a MAC identifier (MAC Id), a cell-radio network temporary identity (C-RNTI) , And a packet-temporary mobile subscriber identity (P-TMSI). Considering further, the data is transmitted in one of RRC information, user data, and uplink control information.

After consideration, the method further includes a step of receiving a response to the data, wherein the response includes the identifier, the indicator, and a C-RNTI. Considering further, the response is one of RRS information, user data, and downlink control information.

Another aspect of the present invention provides a method for communicating information in a mobile communication system. The method includes receiving a preamble through a random access channel (RACH), generating an identifier according to the preamble, generating an indicator corresponding to the identifier, transmitting a response to the preamble, The response includes the identifier and the indicator and receiving data transmitted using the identifier and the indicator.

After consideration, the identifier is generated based on one of a signature and a RACH timing in the preamble. Considering further, the identifier includes a random identifier (random Id), a MAC identifier (MAC Id), a cellular radio network temporary identifier (C-RNTI), and a packet temporary mobile user identifier (P -TMSI) and so on.

After consideration, the method further includes using the identifier and indicator in the received data to determine which mobile communication terminal the data is received from. Taking a further consideration, the data is received from one of RRC information, user data, and uplink control information.

After consideration, the method further includes transmitting a response to the data, which includes the identifier, the indicator, and a C-RNTI. Considering further, the response is transmitted in one of RRS information, user data, and downlink control information.

Another aspect of the present invention is to provide a method of disseminating information in a mobile communication system. The method includes a mobile communication terminal that transmits a preamble through a random access channel (RACH), a network that generates an identifier based on the preamble and generates an indicator corresponding to the identifier, and the network transmission is for the preamble. One of the sequence codes is a response, and the response includes the identifier and the indicator, and the mobile communication terminal that uses the identifier and the indicator to transmit data.

After consideration, the network generates an identifier based on at least one of the signature in the preamble and the RACH timing. Considering further, the identifier includes a random identifier (random Id), a MAC identifier (MAC Id), a cellular radio network temporary identifier (C-RNTI), and a packet temporary mobile user identifier (P -TMSI) and so on.

After consideration, the method further includes using the identifier and the network of the indicator in the received data to determine that the data is received from the mobile communication terminal. Taking a further consideration, the mobile communication terminal transmits data in one of RRC information, user data, and uplink control information.

After consideration, the method further includes a network that transmits a response to the data, and the response includes the identifier, the indicator, and a C-RNTI. After further consideration, the network transmits responses in one of RRS information, user data, and downlink control information.

The additional features and advantages of the present invention will be presented in the following description, and some of them will be apparent from the description, or can be learned from the implementation of the present invention. We will understand that the previous description and the following detailed description of the present invention are only for demonstration and explanation, and provide more explanations as the invention proposed by the claimant.

These and other specific embodiments can be easily understood by those skilled in the art through the following detailed description with specific embodiments associated with the accompanying drawings, and the present invention is not limited to the specific specific embodiments disclosed.

Hereinafter, specific embodiments of the present invention related to the accompanying drawings will be described. Similar reference numbers in the drawings represent similar elements throughout the specification.

When the switch of a UE 10 is turned on, it will try to access a new cell via RACH. The UE 10 receives system information from the cell synchronously with the downlink channel.

After receiving the system information, the UE 10 must transmit an access request message for the RRC connection. However, because the UE 10 is not synchronized with the current network, and the uplink radio resources are not guaranteed, the RACH is used. In order to use the RACH to transmit access request information to the network, the UE 10 requests the configuration of radio resources.

The eNode-B receives the radio resource request and allocates radio resources to the UE 10. The UE then uses the allocated radio resources to transmit RRC access information to the network.

When a UE is connected to the network by RRC, it receives radio resources scheduled according to the radio resources from the network, and uses the radio resources to transmit data to the network. When the uplink radio resources are allocated to a UE that has no data to transmit, the efficiency is not good, so there is no remaining data in the buffer memory of the UE to transmit, then the network no longer allocates uplink radio resources to the UE. UE 10.

The buffer memory status of the UE 10 is reported to the network according to several periods or occurrences. When the buffer memory of a UE 10 that does not have radio resources receives new data, because the UE does not have configured uplink radio resources, the UE uses RACH. The UE 10 requests to configure radio resources that must use the RACH to transmit data to the network.

The RACH of WCDMA will be explained. The RACH is used to transmit short-length data in the uplink direction.

A part of an RRC message, such as a connection request message (connection request message), a cell update message (cell update message), and a URA update message (URA update message), are transmitted through the RACH. A logical channel, such as a common control channel (CCCH), a dedicated control channel (DCCH), and a dedicated traffic channel (DTCH), can be mapped to RACH. The RACH can be mapped to a physical channel, such as a physical random access channel (PRACH).

Figure 4 is a schematic diagram showing a PRACH example. As shown in Figure 4, the PRACH, which is an uplink physical channel, may include a preamble part and an information part.

The preamble part executes a power ramping function to adjust the transport power used to transport a message, and executes a function for avoiding collisions between transmissions from a plurality of UEs 10. The information part performs a function for transmitting a MAC protocol data unit (PDU) sent from the MAC layer to the physical channel.

The physical layer selects an access period and a signature, and when the MAC layer of the UE 10 instructs the physical layer to transmit the PRACH, it transmits the PRACH pre-code part in the uplink direction. The preamble part can be transmitted during the access period interval of 1.33 ms. A signature can be selected from 16 signatures during a specific initial interval of the access slot.

When the UE 10 transmits the preamble, the eNode-B can transmit a response signal via a physical downlink channel, such as an acquisition indicator channel (AICH). The eNode-B transmits a response signal including an acknowledgement (ACK) response or a non-acknowledgement (NACK) response to the UE 10 via the AICH. When receiving the ACK, the UE 10 transmits the information part. When the ACK is received and the predetermined time has passed, the MAC layer of the UE 10 instructs the physical layer of the UE to transmit PRACH.

When it does not receive any response signal corresponding to the transmitted preamble after a specified access period, the UE 10 uses a higher level of power than the previous preamble to transmit a new preamble code.

In addition to the RACH preamble, a data transport signal or a control signal can be transmitted from the eNode-B to the UE 10. The control signal transmitted from the eNode-B to the UE includes downlink scheduling information, uplink scheduling grant, and response information transmitted in the code part before RACH.

In the uplink or downlink direction, an identifier is used to avoid collisions in multiple transmissions from the UE 10. The eNode-B generates the identifier and transmits the identifier to the UE 10. The UE uses the identifier to transmit data.

When the UE uses the identifier to avoid collisions between identifiers, an indicator used to identify multiple identifiers may be included therein. When the UE transmits data or control signals to the eNode-B, the identifier can be used by the eNode-B to distinguish multiple UEs 10. The indicator of the identifier can be used together with the identifier.

The eNode-B can use the identifier to transmit data or control signals to a specific UE 10. The indicator of the identifier can be used together with the identifier. When data is transmitted from the UE 10 to the eNode-B, the identifier may be required.

The identifier and the indicator will be described below. The identifier can be a random identifier (random Id), a MAC identifier (MAC Id), a cellular radio network temporary identifier (C-RNTI), or a packet temporary mobile user identifier (P-TMSI) .

When using RACH, random Id and MAC Id can be used. The random Id or the MAC Id may have the same length as the C-RNTI.

For example, the random Id, the MAC Id, and the C-RNTI may all be 10 bits long. The alternative is that only the MAC Id and the C-RNTI can have the same length.

According to a transmission opportunity and the signature of the previous sequence code part selected by the UE, the UE 10 and the eNode-B can generate the same random Id. For example, when the UE transmits the signature of the preamble part to the eNode-B once through the transmission opportunity, the UE 10 and the eNode-B can obtain the same ramdom Id from the information of the signature and the transmission timing. The eNode-B informs the UE 10 through system information or paging message that it is acquiring random Id information, such as the information on the signature and its transmission timing.

Before the eNode-B configures the C-RNTI to the UE, the MAC Id can be an identifier used to identify the UE 10 in a specific cell. MAC Id can be obtained from random Id.

When the random Id has the same length as the C-RNTI, the random Id and the MAC Id can be exactly the same. When the length of random Id is shorter than C-RNTI, a random Id can extend MAC Id. The eNode-B informs the UE 10 how to obtain the MAC Id from the random Id through system information or call information.

The C-RNTI is an identifier used to identify the UE 10 in a cell, and is configured and/or de-allocated by the eNode-B. When the UE enters a new cell, the UE 10 can receive a new C-RNTI from the eNode-B. The MAC Id has the same length as the C-RNTI. P-TMSI is an identifier used to identify the UE 10 in a CN, and is configured and/or de-configured by the AG 30.

The indicator belonging to the identifier distinguishes multiple identifiers. The indicator distinguishes multiple identifiers used in RACH, such as random Id, MAC Id, and C-RNTI. When the length of the random Id or MAC Id is exactly the same as the C-RNTI, the indicator is used to prevent the identifiers from colliding with each other.

For example, if the length of MAC Id is exactly the same as the length of C-RNTI, and UE A has a C-RNTI with a value of 1111 0000 and a length of 8 bits in the current cell, UE B uses RACH to access The cell. In addition, if the MAC Id is obtained from a random Id, and the MAC Id also has a length of 8 bits and a value of 1111 0000, the eNode-B tries to use the identifier to transmit the response message in the preamble part to UE B.

However, since UE A also uses its identifier to receive information from the eNode-B, UE A may receive the information sent to UE B by mistake. In addition, because UE B uses the MAC Id before receiving the C-RNTI from the eNode-B, when UE B uses its identifier to transmit specific information to the eNode-B, the eNode-B may not be able to determine whether the information is from the eNode-B. Transmission at UE A or UE B.

The indicator is used to distinguish between random Id and MAC Id. The random Id or MAC Id identifies the UE 10 in the RACH and the C-RNTI or P-TMSI used for communication between the eNode-B and the CN in the cell. For example, when the indicator has a bit, a value of "0" can display random Id or MAC Id, and a value of "1" can display C-RNTI or P-TMSI.

The identifiers and indicators that have been transmitted will be described below. Figure 5 illustrates the link scheduling information. As shown in FIG. 5, the identifier and the indicator of the identifier have been included in the downlink scheduling information of a control signal transmitted from the eNode-B to the UE 10.

As shown in Figure 5, the eNode-B, the identifier and the indicator are transmitted to the UE 10 via a DL-SCCH. When transmitting the next information, the UE 10 can use the indicator and the identifier to transmit data or a control signal to the eNode-B.

Figure 6 illustrates a scheduling grant on the chain. As shown in Figure 6, the identifier and indicator belonging to the identifier have been included in an uplink scheduling grant of the control signal transmitted from the eNode to the UE 10.

As shown in Figure 6, the eNode-B transmits uplink scheduling grant information to the UE 10 via a DL-SCCH or a DL-SCH. Different information can be transmitted through DL-SCCH and DL-SCH respectively.

The identifier and the indicator of the identifier are transmitted to the UE 10 via DL-SCCH or DL-SCH. To transmit the next information, the UE 10 can use the identifier and the indicator to transmit data or control signals to the eNode-B.

Figure 7 is a flowchart illustrating a method for avoiding collisions according to an embodiment of the present invention. Figure 7 illustrates the identifier used and the indicator of the identifier when the UE 10 uses RACH.

As shown in Figure 7, the UE 10 uses the selected signature and transmission timing (S110) to transmit the preamble part to the eNode-B. The eNode-B transmits the response information of the preamble part to the UE (S120).

The response information may include an identifier, such as a MAC Id. The response information may further include an indicator for identifying the identifier.

The eNode-B uses the preamble part to obtain a random Id and generate a MAC Id. The eNode-B and the UE 10 have the same MAC Id. The eNode-B informs the UE 10 of the method of generating its MAC Id with system information or call information.

The UE 10 receives the response information used for the preamble part, and uses the radio resource allocation information and identifier, such as MAC Id, and the indicator included in the response information to transmit data (S130). The data may include the identifier, such as MAC Id, and an indicator for identifying the identifier. The transmitted data can be an RRC information, user data or uplink control information.

The eNode-B transmits response information from the UE 10 for the received data. The response information may include an identifier, such as MAC Id, an indicator for identifying the identifier, and a C-RNTI used by the UE 10 in the cell. The response information can be RRC information, user data, or downlink control information.

The method steps connected with the specific embodiments disclosed herein can be implemented by hardware, software, or a combination thereof. The hardware can be designed to perform one of the above functions by a special application integrated circuit (application specific integrated circuit, ASIC), digital signal processing (digital signal processing, DSP), programmable logic device (programmable logic device, PLD), field programmable gate array (FPGA), processor, controller, microprocessor, other electronic unit, or a combination thereof for implementation . A module used to perform the above functions can implement the software. The software can be stored in a memory unit and executed by a processor. The memory unit or the processor can adopt various components that are well known to those skilled in the art.

As described above, according to the present invention, it is possible to provide a method for efficiently using an identifier of a UE when the UE uses a RACH and a method for using an indicator when the identifier is used. , In order to transmit or receive reliable data while reducing collisions among multiple transmissions from the UE. .

Without departing from its spirit or basic characteristics, the present invention can be implemented in many different forms. Unless otherwise specified, we should also understand that the above-described embodiments are not limited by any previous detailed descriptions, but It should be interpreted broadly within its spirit and scope as defined in the scope of the attached patent application. Therefore, all changes and modifications that fall within the scope of the patent application, or equivalents of these limits are included in the scope of the attached patent application.

The foregoing specific embodiments and advantages are only exemplary and should not be construed as limiting the present invention. This teaching can be immediately applied to other types of devices. The description of the present invention is intended to illustrate, not to limit the scope of the claim.

For those skilled in the field, many substitutions, modifications, and changes will become obvious. In the scope of patent application, the meaning of means plus function terms is to cover the structures described herein as performing the functions, and not only those with the same structure, but also those with the same structure.

<p>10. . . User equipment</p><p>20. . . eNode-B</p><p>30. . . AG</p>

In order to provide a further understanding of the present invention, the accompanying drawings are incorporated and constitute a part of this specification, which illustrate specific embodiments of the present invention and explain the principles of the present invention together with the description section. According to one or more specific embodiments, the features, elements, and aspects of the present invention contrasted by the same number in different drawings exhibit the same, equivalent or similar features, elements, or aspects.

Figure 1 is a block diagram illustrating a communication network.

Figure 2 is a block diagram illustrating the control plane of a radio interface protocol.

Figure 3 is a block diagram illustrating the user plane of a radio interface protocol.

Figure 4 illustrates an example of a physical random access channel (PRACH).

Figure 5 illustrates the downlink scheduling information.

Figure 6 illustrates an uplink scheduling grant.

Figure 7 is a flowchart illustrating a method for avoiding collisions according to an embodiment of the present invention.