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    公开号:ES2642165T9
    申请号:ES16182345.5T
    申请日:2010-01-06
    公开日:2017-11-28
    发明作者:Sung-Duck Chun；Seung-June Yi；Sung-Jun Park
    申请人:LG Electronics Inc；
    IPC主号:
    专利说明:

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    DESCRIPTION
    Procedure for managing a temporary alignment command during a random access procedure Technical field
    The present invention relates to a radio communication system (wireless) that offers a radio communication service and a terminal, and more particularly, to a procedure for managing a time alignment command (TAC) during a procedure (or process) of random access in a universal evolved mobile telecommunications system (E-UMTS) or a long-term evolution system (LTE).
    Background of the technique
    Figure 1 represents an example of the network structure of an evolved universal mobile telecommunications system (E-UMTS) as a mobile communication system to which a prior art and the present invention is applied. The E-UMTS system is a system that has evolved from the UMTS system, and the 3GPP standards organization is currently responsible for carrying out its standardization tasks. A particular reference is made with respect to the related technique in the specification TS 36.321 V8.4.0 (12-2008) of the 3GPP. The E-UMTS system can also be called the "LTE system" (for long-term evolution).
    The E-UMTS network can be roughly divided into an E-UTRAN and a basic network (CN). The E-UTRAN generally comprises a terminal (i.e. a user equipment (UE)), a base station (i.e. an eNode B) and an access gateway (AG) that is located at one end of the network E-UMTS and connects to one or more external networks. The AG can be divided into a part to process user traffic and a part to manage control traffic. In that case, an AG to process new user traffic and an AG to process control traffic can communicate with each other via a new interface. An eNode B can have one or more cells. The eNode B can share the use of an interface to transmit user traffic or control traffic. The CN may comprise an AG, nodes for the registration of users from other UEs and the like. An interface can be used to distinguish between the E-UTRAN and the CN.
    The various layers of the radio interface protocol between the mobile terminal and the network can be divided into a layer 1 (L1), a layer 2 (L2) and a layer 3 (L3), based on the three lower layers of the standard model of Open Systems Interconnection (OSI), well known in the field of communication systems. Of these layers, layer 1 (L1), that is, the physical layer, offers an information transfer service to a higher layer through a physical channel, while a radio resource control (RRC) layer that is located in the lower part of layer 3 (L3) it plays the role of radio resources control between the terminal and the network. To do this, the RRC layer exchanges RRC messages between the terminal and the network. The RRC layer can be distributed in network nodes, such as eNode B, AG, etc., or it can be located only in eNode B or AG.
    Figure 2 represents an example of control plane architecture of a radio interface protocol between a terminal and a UTRAN (UMTS terrestrial radio access network) in accordance with the 3GPP radio access network standard. The radio interface protocol shown in Figure 2 comprises, in the horizontal direction, a physical layer, a data link layer and a network layer and comprises, in the vertical direction, a user plane for transmitting user data and a control plane to transfer control signals. The protocol layer of Figure 2 can be divided into L1 (layer 1), L2 (layer 2) and L3 (layer 3) based on the three lower layers of the standard open system interconnection (oSl) model, widely known in the field of communication systems.
    Hereinafter, the particular layers of the control plane of the radio protocol of Figure 2 and the user plane of the radio protocol of Figure 3 will be described.
    The physical layer (layer 1) uses a physical channel to offer an information transfer service to a higher layer. The physical layer is connected to a medium access control (MAC) layer located above the first through a transport channel, and the data is transferred between the physical layer and the MAC layer through the transport channel. Also, between the different physical layers, that is, between the respective physical layers of the transmitting part (transmitter) and the receiving part (receiver), the data is transferred by means of a physical channel.
    The media access control (MAC) layer of layer 2 provides services to a radio link control (RLC) layer (which is an upper layer) through a logical channel. The RLC layer of layer 2 is able to offer reliable data transmission. It should be appreciated that, if the RLC functions are implemented in the MAC layer and are carried out by it, the RLC layer could be dispensed with. The PDCP layer of layer 2 performs a header compression function that reduces unnecessary control information, so that the data transmitted by Internet protocol (IP) packets, for example IPv4 or IPv6, can be sent effectively through a radio interface that has a relatively small bandwidth.
    The radio resource control layer (RRC), located in the lower part of layer 3, is only defined in the control plane and manages the control of the logical channels, transport channels and physical channels with respect to to
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    the configuration, reconfiguration and release of radio bearers (RB). In this case, the RB refers to a service that provides layer 2 for the transfer of data between the mobile terminal and the UTRAN.
    Next, the reconfiguration of an RRC connection is described. In general, when the RRC connection is established between a terminal and a network (base station), the network provides the necessary parameters and their values to the terminal in order to allow data communication with the terminal. Through these parameters and their values, it is possible to indicate to the terminal which logical channel has been configured, the identity or identity number of each logical channel or the setting value for the timers. If during a call it is necessary to change the parameters and the values of the parameters, the network can provide the new parameters and their values to the terminal by means of an RRC connection reconfiguration message. In this case, the terminal commonly applies or uses the new parameters just after receiving the RRC connection reconfiguration message.
    Next, the maintenance of uplink time alignment in an LTE system is described. In the LTE system based on orthogonal frequency division multiplexing (OFDM) technology, interference between terminals (UE) may occur during a communication between a UE and a base station (eNB). In order to minimize interference between the terminals, it is important that the base station manages or controls the transmission time of the UE. More particularly, the terminal may be in a random area of a cell, which implies that the time of data transmission (ie, the time it takes for data to move from the UE to the base station) may vary depending on The location of the terminal. In particular, if the terminal is at the edge of the cell, the data transmission time of that specific terminal will be much longer than the data transmission time of the terminals located in the center of the cell. On the other hand, if the terminal is in the center of the cell, the data transmission time of that specific terminal will be much shorter than the data transmission time of the terminals that are on the edge of the cell. The base station (eNB) must manage or control all the data or signals that the terminals transmit within the cell in order to avoid interference between the terminals. In particular, the base station must adjust or manage the transmission times of the terminals in each terminal condition, and said adjustment may be referred to as "temporary alignment maintenance". One of the procedures for maintaining temporal alignment is a random access procedure. Specifically, during the random access procedure, the base station receives a random access preamble transmitted from the terminal, and thus the base station can calculate a temporary alignment value (Sync) by means of the random access preamble received, being the operational time alignment value to adjust the data transmission time of the terminal (that is, reduce or increase it). The calculated time alignment value can be notified to the terminal by a random access response, and the terminal can update the data transmission time based on the calculated time alignment value. In another procedure, the base station can receive a polling reference symbol (SRS) transmitted periodically or randomly from the terminal, the base station can calculate the time alignment value (Sync) based on the SRS and the terminal can update the data transmission time according to the calculated time alignment value.
    As mentioned above, the base station (eNB) can measure the transmission time of the terminal through a random access preamble or SRS and can communicate an adjustable time value to the terminal. In this case, the time alignment value (Sync), that is, the adjustable time value, can be referred to as "time advance command" (hereinafter, "tAc"). The TAC can be processed in a MAC (media access control) layer. Since the terminal is not in a fixed location, the transmission time changes frequently depending on the location through which the terminal travels and / or the speed at which the terminal travels. In this sense, if the terminal receives the temporary advance command (TAC) from the base station, the terminal expects the temporary advance command to be valid only for a certain period of time. A time alignment timer (TAT) is used to indicate or represent the given time period. Thus, the time alignment timer (TAT) starts when the terminal receives the tAc (time advance command) from the base station. The TAT value is transmitted to the terminal (UE) through an RRC (radio resource control) signal, for example, with system information (SI) or a reconfiguration of the radio carrier. In addition, if the terminal receives a new TAC from the base station during a TAT operation, the TAT is restarted. In addition, the terminal does not transmit any other uplink data or control signal (for example, data on the physical uplink shared channel (PUSCH) and the control signal on the physical uplink control channel (PUCCH)) , except for the random access preamble when the TAT has expired or is not running.
    In general, a terminal (or UE) can carry out a random access procedure in the following cases: 1) when the terminal makes an initial access because there is no RRC connection with a base station (or eNB), 2) when the terminal initially accesses a destination cell in a handover procedure, 3) when requested by a command from a base station, 4) when an uplink data transmission is performed in a situation where the temporary link synchronization ascending is not aligned or when a specific radio resource used to request radio resources has not been assigned and 5) when a recovery procedure is performed in the event of a radio link failure or a handover failure.
    In the LTE system, the base station assigns a dedicated random access preamble to a specific terminal, and the terminal performs a non-contentious random access procedure that performs a random access procedure with the random access preamble. In other words, there are two selection procedures
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    of random access preamble: a random access procedure based on contention, in which the terminal randomly selects a random access preamble from among a specific group, and a random non-contention based access procedure, in which the terminal it uses a random access preamble that the base station has assigned only to a specific terminal. The difference between the two random access procedures is whether or not a conflict problem occurs due to a contest, as described below. The non-contention random access procedure can be used, as described, only in the transfer procedure or when requested by the base station command.
    According to the random access procedure not based on prior art contention, if the terminal receives a temporary alignment command, the terminal reconfigures the uplink synchronization by the received temporary alignment command. However, even with the random access procedure not based on contention, in a given case a plurality of different terminals can use in common a preamble selected by a base station. Therefore, in some cases, the received temporary alignment command may cause uplink desynchronization, and may create signal interference in a cell, due to unnecessary TAC transmission by the uplink.
    Exhibition of the invention
    Solution to the problem
    Accordingly, one of the objectives of the present invention is to provide a procedure for managing a time alignment command during a random access procedure in a wireless communication system. More particularly, according to the present invention, a terminal selectively applies an uplink synchronization alignment command (ie, a TAC) according to the type of random access procedure, thereby carrying out synchronization management. uplink without wasting any unnecessary radio resources.
    To achieve this and other advantages and in accordance with the objective of the present invention, understood and described in general terms herein, a method according to the independent claim is disclosed.
    Other embodiments are given by the dependent claims.
    Brief description of the drawings
    Figure 1 represents an exemplary network structure of an evolved universal mobile telecommunications system (E-UMTS) as a mobile communication system to which a related technique and the present invention are applied;
    Figure 2 represents an exemplary view of a control plane architecture of the related technique of a radio interface protocol between a terminal and an E-UTRAN;
    Figure 3 represents an exemplary view of a user plane architecture of the related technique of a radio interface protocol between a terminal and an E-UTRAN;
    Figure 4 represents an exemplary view of a random access procedure based on contention;
    Figure 5 represents an exemplary view of a random access procedure not based on contention and
    Figure 6 represents an exemplary view of a time synchronization operation for a transmission of
    uplink according to the present exhibition.
    Mode for the invention
    One of the aspects of the present exhibition refers to the recognition by the present inventors of the problems of the related technique that have been described above and which are detailed below. The characteristics of this exhibition have been defined based on this recognition.
    Although the present exhibition is implemented in a mobile communication system, such as a UMTS system developed according to 3GPP specifications, this exhibition can also be applied to other communication systems that operate in accordance with different standards and specifications.
    Hereinafter, the description of the structures and operations of the preferred embodiments according to the present disclosure will be described with reference to the attached drawings.
    Figure 4 represents an operation procedure between a terminal and a base station in a random access procedure based on contention.
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    First, a contention-based random access terminal can randomly select a random access preamble from a group of random access preambles indicated through system information or a handover command, you can select PRACH resources capable of transmitting the random access preamble and then can transmit the selected random access preamble to a base station (step 1).
    After transmitting the random access preamble, the terminal may attempt to receive a response with respect to its random access preamble within a random access response reception time slot indicated through the system information or the command handover (stage 2). More particularly, the random access response information is transmitted in a form of MAC PDU, and the MAC PDU can be transferred in the physical downlink shared channel (PDSCH). In addition, the physical downlink control channel (PDCCH) is also transferred, so that the terminal duly receives the information transferred in the PDSCH. That is, the PDCCH may comprise information about a terminal that the PDSCH should receive, frequency and time information of the radio resources of the PDSCH, a transfer format of the PDSCH, etc. Then, if the PDCCH has been received correctly, the terminal can receive without problems the random access response transmitted in the PDSCH according to the PDCCH information. The random access response may comprise a random access preamble identifier (ID), a UL concession, a temporary C-RNTI, a temporary alignment command, etc. In this sense, the random access preamble identifier is included in the random access response in order to indicate to the terminals for which of them the information is valid (available, effective), such as the UL concession, the C -RNTI temporary and the temporal alignment command, because a random access response may comprise random access response information for one or more terminals. Then, the random access preamble identifier can be identical to the random access preamble selected by the terminal in step 1.
    If the terminal has received the valid random access response for the terminal itself, it can process all the information contained in the random access response. That is, the terminal stores the temporary C-RNTI. In addition, the terminal uses the UL concession to transmit the data stored in a terminal buffer or newly generated data to the base station (step 3). In this case, the terminal identifier must essentially be included in the data contained in the UL concession (message 3). This is because, in the contention-based random access procedure, the base station may not be able to determine which of the terminals is carrying out the random access procedure, which will then necessitate identifying the terminals for the resolution of the contest. Then, two different systems can be offered to include the terminal identifier. A first system consists of transmitting the terminal cell identifier through the UL concession if the terminal has already received a valid cell identifier assigned in a corresponding cell before the random access procedure. On the other hand, the second system consists in transmitting the unique identifier of the terminal (for example, S-TMSI or random ID) if the terminal has not received any valid cell identifier before the random access procedure. In general, the unique identifier is longer than the cell identifier. In step 3, if the terminal has transmitted data through the UL concession, the terminal starts the dispute resolution timer.
    After transmitting the data with its identifier through the UL concession contained in the random access response, the terminal waits for an indication (instruction) of the base station for the resolution of the contest. That is, the terminal tries to receive the PDCCH to receive a particular message (step 4). In this case, two systems are available to receive the PDCCH. As described above, if the terminal identifier transmitted by means of the UL concession is the cell identifier, the terminal attempts to receive the PDCCH by its own cell identifier. If the terminal identifier transmitted through the UL concession is its unique identifier, the terminal attempts to receive the PDCCH via the temporary C-RNTI contained in the random access response. From that moment, in the first case, if the PDCCH (message 4) is received through its cell identifier before the dispute resolution timer has expired, the terminal determines that the random access procedure it has been carried out successfully (normally), to end the random access procedure. For the second system, if the PDCCH is received through the temporary cell identifier before the dispute resolution timer has expired, the terminal checks the data (message 4) transferred by the PDSCH and indicated by the PDCCH. If the unique identifier of the terminal is contained in the data, the terminal determines that the random access procedure has been performed successfully (normally), to thereby terminate the random access procedure.
    Figure 5 represents an operation procedure between a terminal and a base station in a random access procedure not based on contention. In comparison with the randomized access procedure based on contention, the reception of the information of the random access response in the non-contention randomized access procedure makes it possible to determine that the randomized access procedure has been carried out successfully and terminate, of that way, the random access procedure.
    In general, the random non-contention-based access procedure can be performed in the following two cases: the transfer procedure and a request through the command of the base station. For greater certainty, in these two cases, the random access procedure based on contention can also be performed. First, for the random access procedure not based on contention, it is important that it be received,
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    from the base station, a dedicated random access preamble that has no chance of contention. In this case, a handover command and a PDCCH command can be used to assign the random access preamble. Then, once the random access preamble dedicated only to the terminal itself has been assigned from the base station, it transmits the preamble to the base station. From that moment on, the procedure for receiving the random access response information is the same as the randomized access-based access procedure described above.
    The aforementioned non-contention random access procedure starts when the base station tells the terminal to start the non-contention random access procedure. In this case, the base station selects a specific preamble that will be used throughout the random access procedure, and indicates the specific preamble directly to the terminal. For example, if the base station instructs the terminal to use the random access preamble identity number 4 (ie RAPID = 4), the terminal may carry out the random access procedure not based on contention by means of a preamble corresponding to RAPID equal to 4.
    Next, a temporary synchronization operation for an uplink transmission is described.
    When the terminal (or user equipment) receives a MAC (media access control) temporary advance command element, the terminal can apply the temporary advance command. Specifically, the terminal can start the time alignment timer (TAT), (if the TAT is not running), or it can reset the time alignment timer (if the TAT is already running).
    When the terminal receives a temporary advance command in a random access response message and if a random access preamble and a random physical access channel (PRACH) resource are explicitly indicated, then the terminal can apply the temporary advance command , then the terminal can start the temporary alignment timer (if the Tat is not running) or can reset the temporary alignment timer (if the TAT is already running), and if neither the random access preamble is explicitly indicated or the PRACH resource and if the temporary alignment timer is not running or has expired, then the terminal can apply the temporary advance command and can start the temporary alignment timer, and when a dispute resolution is considered unsuccessful, the terminal you can stop the time alignment timer, and in any other case that excludes the previous ones, the terminal can ignore the temporary advance command received.
    The above description of the time synchronization operation for uplink transmission can be represented by the following text procedure:
    The UE will carry out the following actions:
    - when a temporary control command MAC control element is received:
    - apply the temporary advance command;
    - start the time alignment timer (if it is not running) or restart the time alignment timer (if it is already running).
    - when a temporary advance command is received in a random access response message:
    - if the random access preamble and the PRACH resource are explicitly indicated:
    - apply the temporary advance command;
    - start the time alignment timer (if it is not running) or restart the time alignment timer (if it is already running).
    - in any other case, if the time alignment timer is not running or has expired:
    - apply the temporary advance command;
    - start the time alignment timer;
    - When the dispute resolution is deemed unsuccessful, it will stop the time alignment timer.
    - In any other case:
    - ignore the temporary advance command.
    - when the time alignment timer has expired or is not running:
    - Before any UL-SCH transmission, you will use the random access procedure in order to obtain temporary uplink alignment.
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    - when the time alignment timer expires:
    - empty all HARQ buffers and consider that the next transmission for each process is
    the first transmission;
    - inform the RRC layer of the release of the PUCCH / SRS;
    - delete any downlink assignment and uplink concession configured.
    As mentioned above, during a random access procedure not based on contention, there is a two-way correspondence between a terminal and a preamble. Therefore, if the base station receives a specific preamble that has been assigned to a particular terminal, the base station can automatically know that the specific preamble is transmitted from the particular terminal. In addition, since there is no doubt that the specific preamble has been transmitted definitively from the particular terminal, the base station can transmit a temporary alignment command to the particular terminal by checking the temporary synchronization of the received preamble. In this case, the terminal, which receives the time alignment command (TAC), can set its own uplink address synchronization by the received TAC, and can start a time alignment timer (TAT).
    In contrast, during a contention-based random access procedure, there is a one-to-N correspondence between a specific preamble and a plurality of terminals through the specific preamble. Consequently, if the base station receives a particular preamble that has not been specially assigned to a particular terminal, the base station cannot know which particular terminal transmits the determined preamble. In this case, when the base station transmits a time alignment command (TAC) to a plurality of terminals by checking the time synchronization of the received preamble, the time alignment command (TAC) can be transmitted to more than one particular terminal. Therefore, in this specific case, the terminal should not apply the received temporary alignment command.
    However, when a base station begins the random access procedure, for example, the base station can order the terminal to start the random access procedure by the PDCCH command, in most cases, the base station selects a preamble particular and transmits it to the terminal, so that the particular preamble can be used throughout the random access procedure. In the current LTE system, the total number of preambles that can be used in the random access procedure is 64. Some of these preambles can be awarded or assigned for a non-contentious random access procedure, and the rest of preambles can be awarded or be assigned for a random access procedure based on contention. If a plurality of terminals exists in a given cell and the plurality of terminals is actively performing the random access procedure, the available number of preambles that the base station will have at its disposal will be very restricted. For example, if there are many terminals in a cell, it is possible that in some cases, even when the base station has to order the terminal to start the random access procedure, the base station does not have any free preamble for the procedure of random access not based on contention, resulting in a delay in the random access procedure. Said delay may cause a deterioration in the quality of the call, such as a delay in the transmission of data or a loss of packets. To solve this problem, a random access preamble 0 can be used, which is RAPID = 00000. For example, if the terminal receives a PDCCH command with RAPID = 00000, instead of using the preamble assigned by the base station, the terminal selects a preamble from among the preambles assigned for the contention-based random access procedure. Specifically, in case the terminal receives the random access preamble 0 from the base station, the terminal will select a preamble used for the random access procedure. Therefore, since the terminal finally selects the preamble, even if the base station had facilitated the initial random access preamble (i.e., the random access preamble 0), the preamble selected by the terminal can also be used by other terminals . Therefore, if in this situation the terminal receives a temporary alignment command from the base station, it should ignore said temporary alignment command.
    Consequently, one aspect of the present disclosure provides a procedure for managing a time alignment command during a random access procedure performed by a MAC layer in the LTE system. More particularly, according to the present invention, a terminal selectively applies an uplink synchronization alignment command (ie, a TAC) according to the type of random access procedure and / or the type of random access preamble. For example, if a temporary alignment command is received during a random access procedure, the terminal can determine the type of random access preamble that has been transmitted to the network. If the base station has selected and / or indicated the transmitted random access preamble and if the random access preamble is not random access preamble 0 (i.e., RAPID is not 00000), the terminal can adjust the uplink synchronization You can start or reset the temporary alignment timer using the temporary alignment command received. On the other hand, if the base station has not selected the transmitted random access preamble or if the base station has selected the transmitted random access preamble but the random access preamble is equal to the random access preamble 0 (ie, RAPID = 00000 ), the terminal cannot apply the received temporary alignment command.
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    Next, a temporary synchronization operation is described for an uplink transmission according to a first embodiment of the present exposition.
    When the terminal (or user equipment) receives a MAC (media access control) temporary advance command element, the terminal can apply the received temporary advance command. Specifically, the terminal can start the time alignment timer (TAT), if the TAT is not running, or it can reset the time alignment timer, if the TAT is already running.
    When the terminal receives a temporary advance command in a random access response message and if a random access preamble and a random access physical channel (PRACH) resource are explicitly indicated, except in case the preamble has been requested random access 00000, the terminal can apply the temporary advance command, then the terminal can start the temporary alignment timer (if the TAT is not running) or it can reset the temporary alignment timer (if the TAT is already running ), and if neither the random access preamble nor the PRACH resource is explicitly indicated or the random access preamble and PRACH resource are explicitly indicated and the requested random access preamble is 00000 and the time alignment timer is not set executing or has expired, then the terminal can apply the temporary advance command and can start the time alignment timer, and when A contention resolution is considered unsuccessful, the terminal can stop the time alignment timer, and in any other case that excludes the previous ones, the terminal can ignore the temporary advance command received.
    The above description of the temporary synchronization operation for the uplink transmission according to the first embodiment of this exposition can be represented by the following text procedure:
    The UE will carry out the following actions:
    - when a temporary control command MAC control element is received:
    - apply the temporary advance command;
    - start the time alignment timer (if it is not running) or restart the time alignment timer (if it is already running).
    - when a temporary advance command is received in a random access response message:
    - if the random access preamble and the PRACH resource have been explicitly indicated, except in case the requested RA preamble is 00000:
    - apply the temporary advance command;
    - start the time alignment timer (if it is not running) or restart the time alignment timer (if it is already running).
    - in any other case, if the time alignment timer is not running or has expired:
    - apply the temporary advance command;
    - start the time alignment timer;
    - When the dispute resolution is deemed unsuccessful, it will stop the time alignment timer.
    - In any other case:
    - will ignore the temporary advance command received.
    - when the time alignment timer has expired or is not running:
    - Before any UL-SCH transmission, you will use the random access procedure in order to obtain temporary uplink alignment.
    - when the time alignment timer expires:
    - empty all HARQ buffers and consider that the next transmission for each process is the first transmission;
    - inform the RRC layer about the release of the PUCCH / SRS;
    - delete any downlink assignment and uplink concession configured.
    Next, a temporary synchronization operation is described for an uplink transmission according to a second embodiment of the present exposition.
    When the terminal receives an explicit order from the network to begin a random access procedure, the terminal begins a random access procedure. In this case, if the requested random access preamble 5 is equal to "00000", the terminal switches to random contention-based access and the UE has to select one of the contention-based random access preambles. Next, the terminal transmits the selected random access preamble to the network. In other words, if the requested preamble is not "00000", the transmitted random access preamble is the one indicated by the network. And if the requested preamble is "00000", the transmitted random access preamble is the one selected by the UE. Therefore, that the random access response 10 has been explicitly indicated and that the indicated random access response is not "00000" means that the terminal has not selected the transmitted random access response. Thus, depending on whether the specific random access preamble transmitted is selected or not by the terminal, the terminal decides whether or not to apply the received temporary advance command. If the transmitted random access preamble is selected by the terminal, when the terminal (or user equipment) receives a time advance command MAC (access control means) element, the terminal may apply the received temporary advance command . Specifically, the terminal can start the temporary alignment timer (TAT) if the TAT is not running, or it can reset the temporary alignment timer if the TAT is already running.
    When the terminal receives a temporary advance command in a random access response message, and if a terminal (for example, UE MAC) has not selected a random access preamble that has transmitted the terminal, then the terminal can apply the temporary advance command, then the terminal can start the temporary alignment timer (if the TAT is not running) or it can restart the temporary alignment timer (if the TAT is already running), and if they have not been explicitly indicated neither the random access preamble nor the PRACH resource and if the time alignment timer is not running or has expired, then the terminal can apply the time advance command and can start the time alignment timer, and when a resolution of contention is considered unsuccessful, the terminal may stop the time alignment timer, and in any other case that excludes the above, the terminal may and ignore the temporary advance command received.
    The above description of the temporary synchronization operation for the uplink transmission according to the second embodiment of the present exposition can be represented by the following text procedure:
    The UE will carry out the following actions:
    - when a temporary control command MAC control element is received:
    - apply the temporary advance command;
    - start the time alignment timer (if it is not running) or restart the timer
    35 temporary alignment (if already running).
    - when a temporary advance command is received in a random access response message:
    - if the UE UE has not selected the random access preamble:
    - apply the temporary advance command;
    - start the time alignment timer (if it is not running) or restart the timer
    40 temporary alignment (if already running).
    - in any other case, if the time alignment timer is not running or has expired:
    - apply the temporary advance command;
    - start the time alignment timer;
    - When the dispute resolution is deemed unsuccessful, it will stop the time alignment timer.
    45 - in any other case:
    - will ignore the temporary advance command received.
    - when the time alignment timer has expired or is not running:
    - before any UL-SCH transmission, you will use the random access procedure in order to obtain
    temporal alignment of uplink.
    50 - when the time alignment timer expires:
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    - empty all HARQ buffers and consider the next transmission for each process
    It is the first transmission;
    - inform the RRC layer about the release of the PUCCH / SRS;
    - delete any downlink assignment and uplink concession configured.
    Figure 6 represents an exemplary view of a time synchronization operation for an uplink transmission according to the present disclosure.
    As illustrated in Figure 6, a network (ie, a base station) can transmit information related to a random access preamble to a terminal. In this case, the information regarding the random access preamble may indicate a random access preamble identity or may indicate a random access preamble index. The index of the random access preamble may be called "ra-PreambleIndex". In addition, reference may be made to the random access preamble index with a "PRACH resource index", which is the PRACH channel index of a system frame, and a "ra-PRACH-MaskIndex" index, which defines in which A random access preamble can be transmitted from the PRACHs of a system frame. Once the information related to the random access preamble has been transmitted to the terminal, the terminal can transmit the random access preamble to the base station. Next, a time alignment command (TAC) is transmitted from the base station. In this case, the time alignment command can be used to start a timer, such as a time alignment timer (TAT). Once the temporary alignment command has been received, the terminal can check the type of random access preamble transmitted in order to determine whether the received temporary alignment command should be applied or not. For example, if it is determined that the network has selected the transmitted random access preamble, the terminal applies the received time alignment command to start or reset the timer. However, if it is determined that the terminal has selected the transmitted random access preamble, the terminal does not apply the received temporary alignment command.
    According to the present invention, an efficient uplink synchronization command management procedure is provided. Specifically, the procedure makes it possible to improve the stability of the call made by the terminal, minimize data loss or delay in data transmission and prevent signal interference caused by the unnecessary transmission of the TAC over the uplink.
    The present exposition may disclose a procedure for executing, through a terminal, a random access procedure in a wireless communication system, the procedure comprising: receiving a command to start a timer; the determination of the selection or not by a terminal of a random access preamble transmitted in the random access procedure and the start or restart of the timer if it is determined that the terminal has not selected the random access preamble, in which it is made If the received command is ignored if it is determined that the terminal has selected the random access preamble, the command is a temporary alignment command (TAC), the command is received in a random access response message and the timer is a timer. temporal alignment (TAT).
    It can also be said that the present exhibition may disclose a procedure for executing, through a terminal, a random access procedure in a wireless communication system, the procedure comprising: the reception of information relating to a random access preamble from a net; the transmission of a preamble of random access to the network; receiving a command to start a timer; the determination of the selection or not by a network of the random access preamble transmitted in the random access procedure; the start or restart of the timer if it is determined that the network has selected the random access preamble; the determination of the indication or not in the information received from a specific preamble identity and the selection of a random access preamble if it is determined that the information received indicates the specific preamble identity, in which the preamble identity index Specific is 00000, the received command is ignored if it is determined that the network has not selected the random access preamble, the command is a temporary alignment command (TAC), the command is received in a random access response message , the timer is a time alignment timer (TAT) and all stages are performed in the MAC layer.
    Although the present exhibition is described in the context of mobile communications, the present exhibition can also be used in any wireless communication system in which mobile devices are used, such as PDAs and laptops equipped with wireless communication capabilities (i.e., an interface). On the other hand, the use of certain terms to describe this exhibition is not intended to limit the scope of the present exposure to a certain type of wireless communication system. This exhibition is also applicable to other wireless communication systems in which different air interfaces and / or physical layers are used, for example, TDMA, CDMA, FDMA, WCDMA, OFDM, EV-DO, Wi-Max, Wi-Bro , etc.
    The exemplary embodiments can be implemented as a procedure, an apparatus or a manufacturing article by means of standard programming and / or engineering techniques to produce software, firmware,
    hardware or any combination of these. The term "manufacturing article" herein refers to a code or logic implemented in hardware logic (for example, an integrated circuit chip, an on-site programmable door array (FPGA), an integrated application circuit specific (ASIC), etc. or computer-readable media, for example, magnetic storage media (for example, hard disk drives, floppy disks, magnetic tape, etc.), optical storage (CD-ROM, optical discs , etc.), volatile and non-volatile memory devices (for example, EEPRoM, ROM, PROM, RAM, DRAM, SRAM, firmware, programmable logic, etc.).
    A processor can access the computer readable media code and execute it. The code in which the exemplary embodiments are implemented can also be accessible through a means of transmission or from a file server through a network. In such cases, the manufacturing device in which the code is implemented may comprise transmission means, such as a network transmission line, wireless transmission means, signals that propagate through space, radio waves, signals infrared, etc. Obviously, those skilled in the art will recognize that it is possible to introduce many modifications to the present configuration without departing from the scope of the present exposition, and that the manufacturing article 15 can comprise any type of information carrying means known in the field of the art .
    While the present disclosure may comprise different forms without departing from the scope of the claims, it should also be noted that the embodiments described above are not limited by any of the details of the foregoing description, unless otherwise indicated, but rather they should be interpreted broadly within the scope defined in the appended claims.
    twenty
    权利要求:
    Claims (11)
    [1]
    5
    10
    fifteen
    twenty
    25
    30
    35
    40

    1. A procedure for carrying out a random access procedure by a terminal in a wireless communication system, the procedure comprising the following steps:
    receive, in the terminal, a temporary advance command, TAC, to operate a temporary alignment timer, TAT, which is used to control how long the terminal is considered to have uplink temporary alignment,
    in which the TAC is received in a random access response message; The procedure characterized by:
    determine, at the terminal, if a random access preamble to be used by the terminal in the random access procedure was not selected by the terminal; Y
    if it is determined that the random access preamble was not selected by the terminal, apply the TAC, and initiate or restart the TAT;
    if it is determined that the random access preamble was selected by the terminal and if the TAT is not running, apply the tAc, start the TAT, and stop the TAT when a dispute resolution is considered unsuccessful; Y
    if it is determined that the random access preamble was selected by the terminal and if the TAT is running, ignore the received TAC.
    [2]
    2. The method of claim 1, wherein the random access procedure is a random access procedure not based on contention if the random access preamble was not selected by the terminal.
    [3]
    3. The method of claim 1 or 2, wherein the random access procedure is a random access procedure based on contention if the random access preamble was selected by the terminal.
    [4]
    4. The procedure of any preceding claim, wherein the random access procedure is a random access procedure not based on contention if the random access preamble was not explicitly indicated and a random access preamble index was not 00000 .
    [5]
    5. The method of claim 4, wherein the random access preamble index is a "pre-assembly index", which is related to at least one "PRACH resource index", which is a PRACH index within of a system frame or a "ra-PRACH-MaskIndex" which defines in which of the PRACHs within a system frame the terminal can transmit the random access preamble.
    [6]
    6. The method of any of claims 2 to 5, wherein there is a two-way correspondence between the terminal and the random access preamble during the random non-contest based access procedure.
    [7]
    7. The method of any one of claims 3 to 6, wherein there is a one-to-N correspondence between the terminal and the random access preamble during the contention-based random access procedure.
    [8]
    8. The method of any one of claims 2 to 7, wherein a random access preamble dedicated to the non-contention random access procedure is used.
    [9]
    9. The procedure of any preceding claim, wherein a total number of random access preambles used in the random access procedure is 64, and some of the random access preambles are assigned for a random access procedure not based on contention and the rest of the random access preambles are assigned to a random access procedure based on contention.
    [10]
    10. The procedure of any preceding claim, wherein all steps are performed in a media access control layer, MAC.
    [11]
    11. The procedure of any preceding claim, wherein the TAC is ignored if the terminal switches to the performance of the non-contention random access procedure from a contention-based random access procedure.
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    法律状态:
    优先权:
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