JP5240310B2 - Timing adjustment method, mobile station, base station, and mobile communication system - Google Patents

Description

  The present case relates to a timing adjustment method, a mobile station, a base station, and a mobile communication system. This case may be used for uplink (uplink: UL) communication control of a wireless (mobile) communication system.

  As a wireless (mobile) communication system including a wireless terminal (mobile station) such as a mobile phone, a third generation mobile communication service using a code division multiple access (CDMA) system is currently provided. On the other hand, next-generation mobile communication systems that enable higher-speed communication are also being studied. In the 3rd Generation Partnership Project (3GPP), the next generation mobile communication system is being studied as Long Term Evolution (LTE).

  In a mobile communication system, when a radio base station (evolved Node B: eNB) and a mobile station (User Equipment: UE) start communication, a channel used when the UE starts transmission to the eNB is prepared. Is done. In 3GPP, this channel is called a random access channel (RACH), and the communication start procedure by RACH is called random access (RA).

The random access in LTE is designed by the Slotted Aloha method, and time and frequency resources for transmitting the RACH are secured. The RACH includes information for the eNB to identify transmission from the UE. That is, an identifier called a signature (or preamble) is included so that the RACH can be commonly used by a plurality of UEs.
The UE performs transmission using any one of a plurality of signature candidates, so that even if different UEs transmit the signature via the RACH using the same time and frequency resources, If the UE uses a different signature, the eNB can identify the UE based on the received signature.

RACH is used at the start of communication, and thereafter, an individual channel (or shared channel) is used.
For example, when the UE performs RA, for example, at the time of initial transmission (outgoing), when there is an incoming call from the eNB (when downlink (DL) data is generated), at the time of handover, at the time of return after disconnection (interrupted) When communication is resumed). Note that the radio link in the direction from the eNB to the UE is the downlink (DL), and the radio link in the opposite direction is the uplink (UL).

  Here, there may be a case where an individual signature that can be used exclusively is not assigned to a UE whose presence cannot be managed by the eNB, such as at the time of initial transmission or when returning after connection release. Such a UE performs RA by selecting one from a plurality of (for example, 64 types) signatures prepared in advance. Therefore, although with a low probability, multiple UEs may simultaneously perform RA using the same signature. Such an RA method is referred to as a contention based random access procedure.

  In this case, the eNB resolves (selects) the conflicting signature (UE) and responds to the selected UE. Based on the response received from the eNB, the UE determines whether it has been selected by the eNB. The UE selected as the eNB continues communication with the eNB (RA procedure), and performs radio channel setting and the like with the eNB. The UE that has not been selected by the eNB re-executes RA after a certain time has elapsed.

Note that when such a signature collision occurs when the UE performs a handover to switch the connection destination eNB, the connection is interrupted or the communication is disconnected in some cases. Therefore, in LTE, it has been proposed to assign individual signatures in advance to UEs that perform handover. Such an RA method is called a non-contention based random access procedure.
3GPP TS 36.321 V8.1.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Acces Control (MAC) protocol specification”, [online], March 20, 2008, [Search May 22, 2008 ] Internet <URL: http://www.3gpp.org/ftp/Specs/html-info/36321.htm>

In the prior art, in the RA process (during execution), inconvenience may occur in the adjustment of the transmission timing, such as the expiration date of the adjustment information of the transmission timing being expired.
Accordingly, it is an object to solve problems that may occur in adjustment of transmission timing from a base station to a terminal (mobile station).
Another object is to reduce the delay time until the mobile station can connect to the base station and start communication.

  It should be noted that the present invention is not limited to the above-described object, and can be positioned as one of other objects that is an effect obtained by each configuration shown in the embodiments to be described later and that cannot be obtained by conventional techniques. .

For example, the following means are used.
(1) In a timing adjustment method in a mobile communication system including a mobile station and a base station, the mobile station performs transmission processing based on transmission timing adjustment information, and between the mobile station and the base station, When a plurality of parameters related to PUCCH (Physical Uplink Control Channel) resources used for transmission processing are assigned and the mobile station has first transmission timing adjustment information and performs connection processing to the base station, In the course of the connection process including reception of transmission timing adjustment information, if the expiration date of the first transmission timing adjustment information arrives before transmitting a signal including identification information of the mobile station, the transmission is performed. with no releasing part of a plurality of parameters related to the allocated PUCCH resources, it is possible to use a timing adjusting method The

(2) In a timing adjustment method in a mobile communication system including a mobile station and a base station, the mobile station performs transmission processing based on transmission timing adjustment information, and between the mobile station and the base station, When a plurality of parameters related to PUCCH resources used for transmission processing are allocated and the mobile station has first transmission timing adjustment information and performs connection processing to the base station , reception of second transmission timing adjustment information in the course of the connection process including, along with the expiration date of the transmission timing adjustment information of the first is, when arriving before performing transmit a signal including the identification information of the mobile station does not perform the transmission, SRI ( Parameters related to Scheduling Request Indicator (CEDI), parameters related to CQI (Channel Quality Information), and SRS (Sounding Reference Signal) Releasing the parameter sets can be used timing adjustment method.

(3) In a mobile communication system including a mobile station and a base station, the mobile station includes a transmission processing unit that performs transmission processing based on transmission timing adjustment information, and first transmission timing adjustment information. When connection processing to the base station is performed, in the connection processing process including reception of the second transmission timing adjustment information, the expiration date of the first transmission timing adjustment information indicates the identification information of the mobile station. If it arrives before the transmission of the signal including it, the transmission is not performed, and a plurality of parameters related to the PUCCH resource used for transmission processing, which are allocated between the mobile station and the base station, a control unit for releasing the part of the parameters, it is possible to use a mobile communication system comprising a.

(4) in a mobile communication system comprising a mobile station and a base station, the mobile station, based on transmission timing adjustment information, the includes a transmission processing unit that performs transmission processing, the first transmission timing adjustment information When connection processing to the base station is performed, in the connection processing process including reception of the second transmission timing adjustment information, the expiration date of the first transmission timing adjustment information indicates the identification information of the mobile station. When arriving before performing transmit signals including, with not performing the transmission, it is allocated between the mobile station and a base station for a plurality of parameters related to PUCCH resources used for the transmission process, the parameters relating to SRI, CQI And a control unit that releases a parameter related to SRS and a parameter related to SRS as a set can be used. .

(5) A mobile station in a mobile communication system comprising a mobile station and a base station, comprising: a transmission processing unit that performs transmission processing based on transmission timing adjustment information; and first transmission timing adjustment information When connection processing to the base station is being performed, in the course of the connection processing including reception of second transmission timing adjustment information, the expiration date of the first transmission timing adjustment information is the identification information of the mobile station. When a signal containing a signal containing the PUCCH resource is transmitted, the transmission is not performed, and a plurality of parameters related to the PUCCH resource used for transmission processing allocated between the mobile station and the base station are related to the allocated PUCCH resource. a control unit for releasing part of a plurality of parameters, it is possible to use a mobile station comprising a.

(6) The above mobile station in a mobile communication system comprising a mobile station and a base station, comprising, based on transmission timing adjustment information, a transmission processing unit that performs transmission processing, the first transmission timing adjustment information When connection processing to the base station is being performed, in the course of the connection processing including reception of second transmission timing adjustment information, the expiration date of the first transmission timing adjustment information is the identification information of the mobile station. When arriving before performing sending of a signal including, with not performed the transmission, is allocated between the mobile station and a base station for a plurality of parameters related to PUCCH resources used for the transmission process, the parameters relating to SRI, A mobile station including a parameter related to CQI and a control unit that releases parameters related to SRS as a set can be used.

(7) UL (Uplink) in the mobile communication system including a mobile station and a base station, in which a plurality of parameters relating to PUCCH resources used for transmission processing are allocated between the mobile station and the base station A resource management unit, a transmission processing unit that performs transmission processing based on the transmission timing adjustment information, and a second processing unit that includes first transmission timing adjustment information and performs connection processing for the base station. In the course of the connection process including reception of transmission timing adjustment information of the mobile station, if the expiration date of the first transmission timing adjustment information arrives before transmitting a signal including identification information of the mobile station, the transmission is performed. with not performed, and a control unit for releasing part of a plurality of parameters related to the allocated PUCCH resources transmitted from the mobile station having Reception processing unit for receiving the items, it is possible to use a base station comprising a.

(8) An UL resource management unit that is a base station in a mobile communication system including a mobile station and a base station, and allocates a plurality of parameters related to PUCCH resources used for transmission processing between the mobile station and the base station. provided with a, based on transmission timing adjustment information, and a transmission processing unit that performs transmission processing, when doing the connection processing to the base station having a first transmission timing adjustment information, the second transmission timing in the course of the connection process including the reception of the adjustment information, the expiration date of the transmission timing adjustment information of the first is, when arriving before performing transmit a signal including the identification information of the mobile station does not perform the transmission And a controller that releases a parameter related to SRI, a parameter related to CQI, and a parameter related to SRS as a set. Reception processing unit for receiving a signal transmitted from the station, it is possible to use a base station comprising a.

It is possible to solve inconveniences that may occur in adjustment of transmission timing from the base station to the mobile station.
It is also possible to reduce the delay time until the mobile station can connect to the base station and start communication.

1 is a block diagram illustrating an example of a wireless (mobile) communication system according to a first embodiment. It is a sequence diagram which shows an example of a contention base RA procedure. It is a flowchart which shows the operation example of UE in a contention base RA procedure. It is a flowchart which shows the operation example of eNB in a contention base RA procedure. It is a sequence diagram which shows an example of UL communication control (method 1-1) which concerns on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-1) which concerns on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-1) which concerns on 1st Embodiment. It is a flowchart which shows an example of UL communication control (method 1-1) of UE which concerns on 1st Embodiment. It is a sequence diagram which shows an example of UL communication control (method 1-2) which concerns on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-2) which concerns on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-2) which concerns on 1st Embodiment. It is a flowchart which shows an example of UL communication control (method 1-2) of UE which concerns on 1st Embodiment. It is a sequence diagram which shows an example of UL communication control (method 1-3) which concerns on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-3) based on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-3) based on 1st Embodiment. It is a flowchart which shows an example of UL communication control (method 1-3) of UE which concerns on 1st Embodiment. It is a sequence diagram which shows an example of UL communication control (method 1-4) which concerns on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-4) which concerns on 1st Embodiment. It is a sequence diagram which shows another example of UL communication control (method 1-4) which concerns on 1st Embodiment. It is a flowchart which shows an example of UL communication control (method 1-4) of UE which concerns on 1st Embodiment. It is a sequence diagram which shows an example of UL communication control (method 2-1) which concerns on 2nd Embodiment. It is a sequence diagram which shows another example of UL communication control (method 2-1) which concerns on 2nd Embodiment. It is a sequence diagram which shows another example of UL communication control (method 2-1) which concerns on 2nd Embodiment. It is a flowchart which shows an example of UL communication control (method 2-1) of UE which concerns on 2nd Embodiment. It is a sequence diagram which shows an example of UL communication control (method 2-2, 2-3) which concerns on 2nd Embodiment. It is a sequence diagram which shows another example of UL communication control (method 2-2, 2-3) which concerns on 2nd Embodiment. It is a sequence diagram which shows another example of UL communication control (method 2-2, 2-3) which concerns on 2nd Embodiment. It is a flowchart which shows an example of UL communication control (method 2-2) of UE which concerns on 2nd Embodiment. It is a flowchart which shows an example of UL communication control (method 2-3) of UE which concerns on 2nd Embodiment. It is a sequence diagram which shows an example of UL communication control (method 2-4) which concerns on 2nd Embodiment. It is a sequence diagram which shows another example of UL communication control (method 2-4) which concerns on 2nd Embodiment. It is a sequence diagram which shows another example of UL communication control (method 2-4) which concerns on 2nd Embodiment. It is a flowchart which shows an example of UL communication control (method 2-4) of UE which concerns on 2nd Embodiment. It is a sequence diagram which shows an example of UL communication control (method 3-3) which concerns on 3rd Embodiment. It is a sequence diagram which shows another example of UL communication control (method 3-3) which concerns on 3rd Embodiment. It is a flowchart which shows an example of UL communication control (method 3-3) of eNB10 which concerns on 3rd Embodiment. It is a flowchart which shows an example of UL communication control (method 3-3) of UE which concerns on 3rd Embodiment.

Hereinafter, embodiments will be described with reference to the drawings. However, the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described below. That is, the present embodiment can be implemented with various modifications (combining the examples) without departing from the spirit of the present embodiment.
[1] First Embodiment FIG. 1 is a block diagram illustrating an example of a wireless (mobile) communication system according to a first embodiment. The system illustrated in FIG. 1 includes an eNB 10 as an example of a radio base station and a UE 20 as an example of a radio terminal (mobile station) that communicates with the eNB 10 via a radio link in the radio area of the eNB 10.

  In FIG. 1, attention is focused on one eNB 10 and one UE 20, but a plurality of eNBs 10 and UEs 20 may exist in the radio communication system. The radio link includes DL and UL radio channels. Each of the DL and UL radio channels may include a shared channel shared by a plurality of UEs and a dedicated channel that can be used exclusively by each UE.

  Also, the configurations of the eNB 10 and the UE 20 illustrated in FIG. 1 may be common in the subsequent second and third embodiments unless otherwise specified. Furthermore, although it is assumed that the radio base station 10 in this example is an eNB in LTE having a part or all of the functions of the radio network controller (RNC), it is a generation before LTE. (Which does not incorporate the RNC function). In addition, it may be a base station of another system in which the RA procedure is defined.

(1.1) Description of eNB The eNB 10 illustratively includes a transmission / reception antenna 11, a transmission / reception unit 12, a buffer 13, a UL synchronization determination unit 14, a timer management unit 15, and a UL resource management unit 16. I have it.
The transmission / reception antenna 11 (hereinafter also simply referred to as “antenna 11”) transmits a DL radio signal that can be received by the UE 20 existing in a radio area (cell or sector) provided by the eNB 10, while the UE 20 Receives the UL radio signal transmitted by.

  The transmission / reception unit 12 performs predetermined transmission processing on transmission data (including user data and control data) addressed to the UE 20 to generate a radio channel signal, and outputs the signal to the transmission / reception antenna 11. The transmission processing includes, for example, encoding of DL transmission data, modulation of encoded data, mapping of a modulated signal to a frame of a predetermined channel, frequency conversion of a frame signal to a radio frequency (up-conversion), radio Frame power amplification, etc. may be included. For example, a radio frame based on Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) can be applied to the radio frame.

  Further, the transmission / reception unit 12 performs a predetermined reception process on the UL radio signal (radio frame) received by the antenna 11 and acquires the UL data (including user data, control data, etc.) transmitted by the UE 20. To do. The reception processing may include, for example, low noise amplification of a received signal, frequency conversion (down conversion) to a baseband frequency, gain adjustment, demodulation, decoding, and the like. Note that the transmission / reception unit 12 may be functionally provided separately from the transmission unit and the reception unit.

The buffer unit 13 temporarily holds UL reception data and / or DL transmission data.
The timer management unit 15 generates a TA (Time Alignment) value as an example of transmission timing adjustment information that is periodically transmitted (notified) to the UE 20 to ensure (maintain) UL synchronization. This generation and notification of the TA value is performed for the UE 20 that has performed call setting and allocation of radio resources (UL resources) used by the UE 20 for UL data transmission.

  The TA value is one piece of control information used to align (synchronize) the UL data transmission timing by the UE 20 and the UL data reception timing by the eNB 10. That is, the TA value is used to adjust the UL transmission timing of the UE 20 so that the transmission / reception unit 12 can perform reception processing at an appropriate timing. Therefore, the UE 20 can ensure UL synchronization by adjusting the UL transmission timing according to the TA value received from the eNB 10.

Since the UE 20 does not always stop at the same position, the TA value is a variable value corresponding to the distance between the eNB 10 and the UE 20 (the position of the UE 20). Therefore, in order for the UE 20 to ensure (maintain) UL synchronization, it is desirable to periodically update the TA value.
As an example for realizing this update, the eNB 10 periodically generates a TA value corresponding to the position of the UE 20 and notifies the UE 20 of the TA value. The DL control signal used for this notification is called a TA command. In order for the eNB 10 to grasp the position of the UE 20, a UL control signal received from the UE 20 can be used. The control signal used for this measurement is a known signal, for example, SRS (Sounding Reference Signal).

  The timer management unit 15 includes a UL synchronization timer (TA timer) 151. The TA timer 151 starts upon transmission (notification) of the TA value to the UE 20. The timer management unit 15 monitors the timer value. Since the UE 20 changes its position according to the movement, the TA value notified to the UE 20 is not valid forever. Therefore, the TA timer 151 is monitored for the expiration date of the TA value notified to the UE 20. The TA timer 151 is restarted every time a new TA value is generated and notified.

  The UL synchronization determination unit (control unit) 14 monitors the TA timer 151 (timer value) and receives UL confirmation data when receiving UL data or transmitting DL data. It is determined whether or not synchronization is secured (maintained). For example, when the TA timer 151 expires (timeout), it is determined that the UL synchronization is lost even if the actual (lower layer) UL synchronization is secured (maintained).

  The UL resource management unit 16 manages UL resources [for example, channel frequency, time (transmission / reception timing), etc.] used for UL communication (including communication during RA) with the UE 20, and allocation and release thereof. If the OFDMA format is applied to the radio frame, the radio resource management is performed by mapping (mapping) a two-dimensional transmission / reception area (called a burst) defined by a subchannel frequency and a symbol time. It corresponds to managing.

  The UL resource includes, for example, an individual UL control channel (PUCCH: Physical Uplink Control Channel) for the UE 20 and an SRS resource used by the eNB 10 to perform channel estimation, position measurement of the UE 20, and the like. obtain. Further, the PUCCH resource may include resources used by the UE 20 to transmit CQI (Channel Quality Information) and SRI (Scheduling Request Indicator) to the eNB 10.

The CQI resource is used to report the reception state (quality) of the UE 20 to the eNB 10. The eNB 10 can adaptively control DL transmission (transmission data amount, modulation scheme, coding rate, etc.) based on the CQI received from the UE 20.
The SRI resource is used for the UE 20 to notify the eNB 10 that UL data is generated in the UE 20 when UL synchronization is ensured. The UE 20 to which the SRI resource is not allocated can execute RA to notify the eNB 10 of the generation of UL data. Note that, when UL data is generated, the UE 20 in which UL synchronization is not secured can execute RA to notify the eNB 10 of the generation of UL data.

When the TA timer 151 times out, the UL resource management unit 16 is allowed to release the allocation of the PUCCH resource (CQI resource, SRI resource) and SRS resource allocated to the UE 20.
(1.2) Description of UE On the other hand, the UE 20 illustrated in FIG. 1 exemplarily includes a transmission / reception antenna 21, a transmission / reception unit 22, a buffer 23, a UL synchronization determination unit 24, a timer management unit 25, and a UL resource. And a management unit 26.

The transmission / reception antenna 21 (hereinafter sometimes simply referred to as “antenna 21”) transmits a UL radio signal to the eNB 10 in a radio area (cell or sector) provided by the eNB 10, while a DL radio transmitted by the eNB 10 Receive a signal.
The transmission / reception unit 22 performs a predetermined transmission process on UL transmission data addressed to the eNB 10 (including user data, control data, and the like), generates a radio channel signal, and outputs the signal to the transmission / reception antenna 21. The transmission processing includes, for example, encoding of UL transmission data, modulation of encoded data, mapping of a modulation signal to a frame of a predetermined channel, frequency conversion of a frame signal to a radio frequency (up-conversion), radio Frame power amplification, etc. may be included.

  Further, the transmission / reception unit 22 performs a predetermined reception process on the DL radio signal (radio frame) received by the antenna 21 and acquires DL data (including user data, control data, and the like) transmitted by the eNB 10. To do. The reception processing may include, for example, low noise amplification of a received signal, frequency conversion (down conversion) to a baseband frequency, gain adjustment, demodulation, decoding, and the like. Note that the transmission / reception unit 22 may be functionally provided separately from the transmission unit and the reception unit.

The buffer unit 23 temporarily holds UL transmission data and / or DL reception data.
The timer management unit 25 has a UL synchronization timer (TA timer) 251 similar to that in the eNB 10 and manages (monitors) the timer value to monitor the expiration date of the TA value. When the TA command is received from the eNB 10, the TA timer 251 is started or restarted. However, when a new TA value is received from the eNB 10 during the contention-based RA procedure (connection process), the TA value of the TA command received from the eNB 10 may be trusted before the RA procedure is started. In this case, it is allowed to ignore the TA value received during the RA procedure, and control without restarting the TA timer 251 is also allowed. In addition, the timer management unit 25 includes the memory 252 and can store the TA value received from the eNB 10 in the course of the RA procedure in the memory 252 for subsequent application.

  The UL synchronization determination unit (control unit) 24 monitors the TA timer 251 (timer value), and determines whether UL synchronization is ensured (maintained) when performing UL data transmission. When the TA timer 251 times out, it is determined that UL synchronization has been lost. Therefore, when the TA value received from the eNB 10 in the course of the RA procedure is ignored, the TA timer 251 may time out and it may be determined that UL synchronization has been lost during the RA procedure.

The UL resource management unit 26 manages UL resources allocated from the eNB 10 and release thereof. When the TA timer 251 times out and the UL synchronization determination unit 24 determines that UL synchronization has been lost, the UL resource management unit 26 is allowed to release the allocated UL resource.
(1.3) Contention-Based RA Procedure Hereinafter, a contention-based RA procedure as an example of the basic connection process between the eNB 10 and the UE 20 described above will be described with reference to FIGS. FIG. 2 is a sequence diagram illustrating an example of a contention-based RA procedure. FIG. 3 is a flowchart illustrating an example of the contention-based RA procedure in the UE 20, and FIG. 4 is a flowchart illustrating an example of the contention-based RA procedure in the eNB 10.

The contention-based RA procedure is executed when UL data is generated in the UE 20 (during the initial transmission of the UE 20), or when DL data addressed to the UE 20 arrives at the eNB 10 and a DL data incoming notification is received from the eNB 10 Is done. The flowchart in FIG. 3 illustrates the former case, and the flowchart in FIG. 4 illustrates the latter case.
As illustrated in FIG. 3, when UL data is generated in the UE 20, the UE 20 determines whether UL synchronization is secured by the UL synchronization determination unit 24 (processing 1101 to processing 1103).

  As a result of this determination, if UL synchronization is not ensured (if no in processing 1103), the UE 20 uses the UL resource management unit 26 to select one of a plurality of signatures (preambles) prepared in advance. Select. This is intended to reduce the possibility of selecting the same signature between UEs as much as possible, and various selection methods such as selection according to a generated random number can be adopted. The selected signature is included in the message # 1 (RA preamble) and transmitted from the transmission / reception unit 22 to the eNB 10 via the RACH (processing 1011 in FIG. 2 and processing 1104 in FIG. 3).

  When receiving the message # 1, the eNB 10 transmits a response message # 2 (RA response) to the UE 20 (process 1012 in FIG. 2). This RA response # 2 is used to identify the identifier of one or more signatures that the eNB 10 could receive (discriminate), permission to transmit the UL shared channel corresponding to the signature, and the target of the subsequent RA communication (UE 20). It is possible to include an identifier that is temporarily assigned to. This identifier is called a temporary-connection radio network temporary identifier (T-CRNTI).

When the UE 20 receives the RA response # 2 from the eNB 10 (process 1105 in FIG. 3), the UE 20 checks whether or not the received information includes the signature identifier transmitted in the message # 1.
If included, the UE 20 transmits message # 3 (Scheduled Transmission) based on the transmission permission corresponding to the signature transmitted by itself, which is included in the RA response # 2 (processing 1013 and FIG. 2). Process 1106 in FIG. This message # 3 is a signal including a scheduling request for the eNB 10 and can include system architecture evolution (SAE) -temporary mobile subscriber identity (S-TMSI) as an example of the identification number of the UE 20.

Here, although the UE 20 selects a signature in the message # 1, a plurality of UEs 20 may simultaneously transmit the message # 1 to the eNB 10 using the same signature.
In that case, the eNB 10 cannot identify the UEs 20, but the UE 20 that receives the identification information (number) (S-TMSI) transmitted in the message # 3, and which UE 20 has a signature conflict. Can be recognized. Therefore, the eNB 10 can select one UE 20 and resolve the conflict. The reception electric field strength of message # 1 can be used as the selection criterion. For example, the eNB 10 selects the UE 20 having the received electric field strength of the message # 1 that is higher than the others.

The eNB 10 transmits message # 4 (Contention Resolution) to the UE 20 to the UE 20 selected by the conflict resolution (process 1014 in FIG. 2). This message # 4 can include information such as S-TMSI transmitted in message # 3.
Upon receiving the message # 4 from the eNB 10 (process 1107 in FIG. 3), the UE 20 checks whether or not there is a conflict with another UE 20 (checks whether its own identification information is included) (process 1108 in FIG. 3). If there is no conflict, the UL connection process is completed (no route of process 1108 in FIG. 3). Thereafter, the UE 20 uses the temporarily assigned temporary identifier (T-CRNTI) as a definitive identifier [C (cell) -RNTI] for communication with the eNB 10.

  On the other hand, as a result of receiving the message # 4, when the contention with the other UE 20 has occurred (the identification information of itself is not included) (Yes in the process 1108), the UE 20 is designated by the back-off. The process waits for a predetermined time (process 1111). The back-off is information that specifies the timing (waiting time) at which the UE 20 retries the contention-based RA procedure.

  The back-off parameter is notified by message # 2, and by changing this back-off for each UE 20, it is possible to reduce the probability of contention occurring again at the time of retry. Specifically, the maximum back-off time is notified by message # 2, and the UE 20 calculates the back-off time within the time range. For this calculation, various calculation methods such as using a random number can be employed.

  Then, the UE 20 checks whether or not the number of retries exceeds the maximum number due to the retry of the next RA procedure (processing 1112). If not exceeded (if no in process 1112), the UE 20 executes the process after the process 1103 and retries the RA procedure (transmits message # 1). When exceeding (in the case of yes in the process 1112), the UE 20 notifies the upper layer to that effect (process 1113). The upper layer is, for example, a radio resource control (RRC) layer belonging to layer 3.

Upon receiving the notification, the upper layer starts a monitoring timer for monitoring RA continuation (retry). When this monitoring timer times out, the upper layer of the UE 20 executes control (cell selection control or cell reselection control) for reselecting the UL connection request (transmission of message # 1) destination eNB 10 (cell).
In the process 1103, when UL synchronization is ensured (Yes in process 1103), the UE 20 checks whether or not a PUCCH resource (SRI resource) has been allocated (process 1109). If it has been assigned (if yes in process 1109), the UE 20 transmits an SRI (UL data transmission request) to the eNB 10 using the SRI resource (process 1110).

If the SRI resource is not allocated (if the process 1109 is no), the UE 20 transmits the message # 1 to the eNB 10 and executes the RA procedure. That is, even when it is determined in the processing 1103 that synchronization is established, there is a case where the RA procedure is executed when there is no SR PUCCH resource.
On the other hand, the RA procedure by the eNB 10 when the DL data addressed to the UE 20 arrives at the eNB 10 and the incoming notification of the DL data is sent from the eNB 10 to the UE 20 is as illustrated in FIG.

  That is, when the DL data addressed to the UE 20 arrives at the eNB 10 (process 1201), the eNB 10 determines whether UL synchronization is secured by the UL synchronization determination unit 14 (process 1202 and process 1203). If UL synchronization is not ensured (if no in process 1203), the eNB 10 notifies the UE 20 that DL data has arrived (process 1204).

  This notification (incoming notification) may include an individual preamble, but in this embodiment, the UE 20 does not include an individual signature (individual preamble). Therefore, the UE 20 that has received the incoming call notification executes the contention-based RA procedure described above. At that time, if there is a UL resource allocated before, the UL resource is released, and a new UL resource is allocated from the eNB 10 after RA success.

When the eNB 10 receives the message # 1 (RA preamble) from the UE 20 that has started the contention-based RA procedure (process 1205), the eNB 10 returns a response (message # 2) to the UE 20 (process 1206).
When the message # 3 is received from the UE 20 (process 1207), the eNB 10 checks whether there is a message collision (process 1208), and if not, transmits the message # 4 to the UE 20 (the no route of the process 1208). To processing 1209). If there is a message collision (if yes in process 1208), the eNB 10 ends the RA procedure without transmitting message # 4.

The above is the basic procedure of the contention base RA. Here, it is assumed that the eNB 10 cannot accurately manage the value of the TA timer 251 in the UE 20 (the timer values of the TA timer 151 of the eNB 10 and the TA timer 251 of the UE 20 are not synchronized).
Exemplarily, the TA timer 251 of the UE 20 keeps timing, but since the eNB 10 does not know the continuation, the eNB 10 erroneously recognizes that the TA timer 251 of the UE 20 has timed out. Think.

  Examples thereof are shown in FIGS. 5 to 7 (FIGS. 9 to 11, FIGS. 13 to 15, and FIGS. 17 to 19). When the eNB 10 performs call setup and UL resource (for example, SRI resource # 1, CQI resource # 1, SRS resource # 1) allocation to the UE 20 (process 1008), the eNB 10 periodically transmits a TA command to the UE 20. (Processing 1009). The UE 20 that has received this TA command (TA value = TA # 1; first timing adjustment information) starts the TA timer 251.

  When the UE 20 performs UL transmission based on TA # 1 notified by the TA command, and the DL data addressed to the UE 20 arrives at the eNB 10 after the transmission ends, the eNB 10 notifies the UE 20 of an incoming call notification (message (Transmission of # 0) is performed (process 1010). Receiving this incoming call notification # 0, the UE 20 starts a contention-based RA procedure in order to ensure UL synchronization and resources.

  That is, UE20 transmits message # 1 containing the selected signature (random preamble) to eNB10 (process 1011), and eNB10 which received this message # 1 returns RA response # 2 to UE20 (process 1012). . At that time, the eNB 10 includes a new TA value (TA # 2; second timing adjustment information) in the RA response # 2.

The UE 20 that has received the RA response # 2 can restart the TA timer 251 by applying the new TA # 2, but can also ignore the TA # 2 as described above. If ignored, the TA timer 251 may time out between the subsequent transmission of message # 3 (process 1013) and the reception of message # 4 (process 1014).
In this case, if the UE 20 determines that UL synchronization has been lost and releases all UL resources that have been reserved so far, transmission of UL data other than the RACH becomes impossible thereafter.

Therefore, in this example, when the TA timer 251 times out during the contention-based RA procedure, UL synchronization and UL resources are secured as follows. In the drawings used in the following description (including other embodiments to be described later), the processes given the same process numbers mean the same or similar processes unless otherwise specified.
(1.4) When there is no contention with other UEs 20 when message # 4 is received When there is no contention with other UEs 20 (when RA is successful), an individual UL for each UE 20 that has performed RA Indicates that the resource has been secured. However, since the TA timer 251 has timed out, it cannot be said that UL synchronization has been secured.

Therefore, the UE 20 ensures UL synchronization using any one of the following four methods 1-1 to 1-4.
(1.4.1) Method 1-1 (FIGS. 5 to 8)
As illustrated in FIG. 8, the UE 20 stores the TA value (TA # 2) received by the message # 2 in the course of the contention-based RA procedure in the memory 252 of the timer management unit 25 (processing 1105a). .

When the UE 20 (UL resource management unit 26) recognizes that UL synchronization has been lost, the UE 20 (UL resource management unit 26) used the transmission process based on TA # 1 received before starting the contention-based RA (assigned from the eNB 10 before starting the RA). (Reserved) UL resources can be released.
The release timing may be, for example, the timing at which the incoming call notification message # 0 is received (the timing at which it is recognized that the UL synchronization management does not match the eNB 10) (Processing 2001), as illustrated in FIG. However, as shown in FIG. 6, the timing when the TA timer 251 times out (processing 2002) may be used. However, as illustrated in FIG. 7, even if the TA timer 251 times out, the UL resource can be secured (continuously used) without being released (process 2003).

Thereafter, when the UE 20 continues the contention-based RA procedure and succeeds in receiving the message # 4, the UE 20 applies the TA value (TA # 2) stored in the memory 252 to the UL transmission and the TA timer 251. Is restarted (from the no route of the processing 1108 to the processing 1114).
In other words, the application of TA # 2 is triggered by the fact that UE 20 receives message # 2 (response signal) including T-CRNTI as an example of its own identification information in the RA process after the TA timer 251 times out. Permissible. “Applying the TA value” means controlling UL transmission (execution of RA) based on the transmission timing indicated by the TA value. This control can be realized, for example, as a function of the UL synchronization determination unit 24 (the same applies hereinafter).

  At this time, the value of the TA timer 251 may be a specified value, or may be set based on the reception timing of the message # 2. For example, assuming that UL synchronization was already successful when message # 2 was received, the value of TA timer 251 is set by subtracting the time required from message # 2 to message # 4 from the specified value. May be. This means that the timer value (expiration date of timing adjustment information) is advanced by the time from when notification of TA # 2 is received by message # 2 until the result of RA is notified.

  Thus, in this example, when the UE 20 performs RA for the eNB 10 based on TA # 1, if TA # 2 is received during the RA process, the TA timer 251 times out (TA # 1 For transmission processing up to (expiration date), TA # 1 is applied to adjustment of transmission timing. For transmission processing after the TA timer 251 times out (after the expiration date of TA # 1), TA # 2 is applied to adjustment of transmission timing.

According to this, it is possible to perform transmission control by applying TA # 2 after the expiration date of TA # 1 has passed (after time-out) without performing immediate update of the transmission timing by TA # 2.
Then, UE20 returns the confirmation response message (ACK or NACK) with respect to message # 4 to eNB10 (process 1015). If the eNB 10 receives ACK as an acknowledgment message for the message # 4, the eNB 10 allocates new UL resources (for example, SRI resource # 2, CQI resource # 2, SRS resource # 2) to the UE 20 (process 1016).

As illustrated in FIG. 7, when the UL resource is not released even when the TA timer 251 of the UE 20 times out, the UE 20 may continue to use the already reserved UL resource. It is also possible to request the eNB 10 to allocate a new UL resource instead of (Processing 1017).
The UE 20 manages the allocated UL resource in the UL resource management unit 26, and thereafter performs UL transmission to the eNB 10 using the UL resource.

(1.4.2) Method 1-2 (FIGS. 9 to 12)
As a second method, as illustrated in FIGS. 9 to 12, the UE 20 stores the TA value (TA # 2) received by the message # 2 in the memory 252 (processing 1105a). Thereafter, it is assumed that the TA timer 251 times out between the transmission of message # 3 (process 1013) and the reception of message # 4 (process 1014).

  In this case, the UE 20 applies the TA value (TA # 2) stored in the memory 252 to the UL transmission without waiting for the reception of the message # 4, and restarts the TA timer 251 (in the processing 1161 in FIG. 12). From the yes route, process 1162). The restart timing may be simultaneous with the timeout of the TA timer 251. That is, application of TA # 2 received by message # 2 is allowed at the timing of TA timer 251 timeout (TA # 1 expiration date).

According to this, even when the transmission timing is not immediately updated by TA # 2, when TA # 1 expires (when time-out occurs), transmission control can be performed by applying TA # 2.
(14.3) Method 1-3 (FIGS. 13 to 16)
As a third method, as illustrated in FIGS. 13 to 16, when the eNB 10 transmits the message # 4, the new TA value (TA # 3) is included (in FIGS. 13 to 15). Process 1014a, process 1107a in FIG.

That is, when the UE 20 performs RA for the eNB 10 based on TA # 1 (first transmission timing adjustment information), the eNB 10 transmits message # 4 (identification of the UE 20) to the UE 20 during the RA process. TA # 3 (second transmission timing adjustment information) is included in a signal including S-TMSI as an example of information.
When receiving this message # 4 from the eNB 10, the UE 20 applies the TA value (TA # 3) included in the message # 4 to the UL transmission and starts the TA timer 251 (process 1114 in FIG. 16).

That is, normally, the message # 4 including the identification information of the mobile station does not include the TA value, but in this embodiment, the message # 4 is received by the message # 2 by including the TA value. The UE 20 ignoring the TA # 2 can apply the TA value of the message # 4 as the adjustment information of the subsequent transmission timing and start the TA timer 251.
In this example, the UE 20 may store the ignored TA # 2 in the memory 252.

(1.4.4) Method 1-4 (FIGS. 17 to 20)
As a fourth method, as illustrated in FIGS. 17 to 20, the UE 20 receives the message # 2 regardless of whether or not it stores the TA value (TA # 2) received from the eNB 10 in the message # 2. At this time, the TA timer 251 is restarted.
In this case, the UE 20 continues to apply the TA value (TA # 1) received from the eNB 10 before the start of the RA procedure to the subsequent RA (UL transmission) (process 1105b in FIG. 20). This is equivalent to controlling the TA timer 251 so that the validity period of the UL transmission timing received from the eNB 10 from the eNB 10 before the RA start is extended during the RA process.

That is, when the UE 20 performs RA for the eNB 10 based on TA # 1, and receives TA # 2 in the process of RA, the UE 20 continues TA # 1 without applying TA # 2. Apply and extend the expiration date of TA # 1.
Note that the period to be extended (the value of the TA timer 251 for TA # 2) may be a specified value, or may be set based on the reception timing of message # 2. For example, in the UL synchronization, the value of the TA timer 251 may be set by subtracting the time required from the reception of the message # 2 to the TA # 1 timeout.

According to this example, TA # 1 can be continuously extended and used even after receiving TA # 2, and can be applied to adjustment of transmission timing.
(1.5) When contention with other UE20 occurs when message # 4 is received When contention with other UE20 occurs when message # 4 is received, duplication with UL resources used by other UE20 occurs This means that an individual UL resource could not be secured in the own station 20.

For this reason, the UE 20 cannot perform UL data transmission other than the RACH, and therefore performs contention-based RA retries to try to ensure UL synchronization (yes route of the process 1108 in FIG. 3).
[2] Second Embodiment In the first embodiment described above, it is assumed that the TA timer 251 of the UE 20 times out after the UE 20 transmits the message # 3 and until the message # 4 is received from the eNB 10. . In the present embodiment, it is assumed that the TA timer 251 of the UE 20 times out after the UE 20 receives the message # 2 from the eNB 10 and transmits the message # 3 to the eNB 10.

  For example, as illustrated in FIGS. 21 to 23, FIGS. 25 to 27, and FIGS. 30 to 32, when DL data addressed to the UE 20 arrives at the eNB 10 and an incoming notification (processing 1010) is performed to the UE 20, Contention-based RA (transmission of message # 1: process 1011) is executed. In this case, if the UE 20 that has received the TA value (TA # 2) with the message # 2 from the eNB 10 ignores the TA # 2, the message # 3 (signal including S-TMSI as an example of identification information of the UE 20) The TA timer 251 may time out before the transmission.

In such a case, the UE 20 (UL synchronization determination unit 24) determines that UL synchronization has been lost, but continues RA by any one of the following methods 2-1 to 2-4.
(2.1) Method 2-1 (FIGS. 21 to 24)
If the UE 20 determines that UL synchronization has been lost, the message # 3 cannot be transmitted essentially. However, the TA timer 251 is often set to fail-safe in a range where UL synchronization in the physical layer is not lost. Therefore, even if the TA timer 251 times out, the actual (lower layer) UL synchronization may be secured.

  Therefore, in this example, even if the TA timer 251 times out after the UE 20 receives the message # 2 from the eNB 10 (process 1012), the UE 20 tries transmission (forced transmission) of the message # 3 to the eNB 10 (FIG. 21 to process 1013a in FIG. 23, process 1105c in FIG. 24, and process 1106a). That is, although time-out has occurred, message # 3 can be transmitted by applying TA # 1. TA # 2 is stored in the memory 252.

That is, when the UE 20 performs RA for the eNB 10 based on TA # 1, if the expiration date of TA # 1 comes before performing the transmission process of message # 3 in the process of RA, TA # 1 Even if the TA # 2 is received before the expiration date of the message # 3, the transmission process of the message # 3 to the eNB 10 can be executed based on the TA # 1.
As a result, if the eNB 10 can receive the message # 3, the UE 20 can continue the subsequent RA procedure without redoing the contention-based RA from the beginning. That is, if the UE 20 succeeds in receiving the message # 4 including its identification information as a response signal to the message # 3, the UE 20 applies the TA # 2 to the adjustment of the transmission timing of the subsequent transmission processing, and sets the TA timer 251. You can start. Therefore, it is possible to reduce a delay until the UL data transmission starts.

  However, since the eNB 10 can recognize that the UE 20 has forcibly transmitted the message # 3, in other words, has violated the regulation, the eNB 10 can also transmit a connection rejection message to the UE 20 with the message # 4. That is, the eNB 10 can transmit a rejection message to the UE 20 when receiving the message # 3 transmitted from the UE 20 based on the TA # 1 after the expiration date of the TA # 1 has passed.

In this case, the UE 20 performs cell selection / reselection or retry of the RA procedure. Alternatively, the eNB 10 may not intentionally transmit the message # 4. In this case, the UE 20 continues to retransmit the message # 3 until the allowable number of retransmissions (the normal maximum number of retransmissions or the maximum number of retransmissions applied only in this case) is reached.
(2.2) Method 2-2 (FIGS. 25 to 28)
As illustrated in FIGS. 25 to 27, the UE 20 receives the message # 2 (TA # 2) (process 1012) and then transmits the message # 3 to the eNB 10 (process 1013). If it has expired, the transmission of message # 3 is canceled and the contention-based RA procedure being executed is canceled (cancelled) (process 1018).

That is, when the UE 20 performs RA for the eNB 10 based on TA # 1, in the process of RA, the expiration date of TA # 1 is a signal including S-TMSI as an example of identification information of UE20. If it arrives before the transmission process is performed, RA is canceled even if TA # 2 is received before the expiration date of TA # 1 arrives.
In this case, as illustrated in FIG. 28, the UE 20 applies a back-off and executes a contention-based RA retry (yes route of the process 1105d). That is, the RA retry is executed at a timing based on the back-off time (waiting time information) received from the eNB 10 during the canceled RA process. As illustrated in FIGS. 25 to 27, the UE 20 performs transmission of the message # 1 (process 1011), reception of the message # 2 (TA # 3) (process 1012), and the like.

  Here, when the message # 2 (TA # 2) is received, the TA timer 251 has timed out (not activated). Therefore, the UE 20 can start the TA timer 251 by applying the new TA # 3 received by the message # 2 during the retryed RA process to the adjustment of the transmission timing of the subsequent UL transmission. When the message # 4 is received and the TA timer 251 recognizes that it is an RA loser (collision), the TA timer 251 may be forcibly terminated (process 2004 in FIGS. 25 to 27).

As shown in this example, when the TA timer 251 times out, the RA procedure is canceled and the RA is retried, so that the remaining procedure (for example, transmission of message # 3 and reception of message # 4) is completed. Than before, the delay until the start of UL data transmission can be reduced.
(2.3) Method 2-3 (FIGS. 25 to 27, FIG. 29)
As described above, when the TA timer 251 times out and the contention-based RA is retried, as illustrated in FIG. 29, the UE 20 may perform the retry without applying backoff (Process 1105d). Yes route).

That is, the UE 20 can execute the RA retry without applying the back-off time received from the eNB 10 during the canceled RA process. By not applying the back-off, it is possible to reduce the delay until the start of UL data transmission, compared to the case where the back-off is applied.
(2.4) Method 2-4 (FIGS. 30 to 33)
Further, as illustrated in FIGS. 30 to 32, when the TA timer 251 times out, the UE 20 may notify the upper layer (for example, the RRC layer) regardless of whether the backoff is appropriate (processing 1021). From the yes route of process 1105d in FIG. 33, process 1113).

  As a result, the upper layer of the UE 20 starts the RA monitoring timer and monitors the continuation (retry) of the RA procedure. That is, the UE 20 monitors the RA according to the timeout of the TA timer 251 (TA # 1 expiration date has arrived). If the monitoring timer times out while RA is continuing, the upper layer of UE 20 executes cell selection or cell reselection processing (processing 1022 in FIGS. 30 to 32).

Therefore, UE20 can start RA with another cell (eNB10) at an early stage, and can reduce delay until UL data transmission start. The RA monitoring by the higher layer according to the timeout of the TA timer 251 may be applied to the above methods 2-1 to 2-3.
[3] Third Embodiment Next, in this embodiment, when the eNB 10 can accurately manage the timer value of the TA timer 251 in the UE 20 (both the TA timers 151 and 251 of the eNB 10 and the UE 20 are synchronized). Case). In this case, since the eNB 10 can recognize that the time measurement of the TA timer 251 of the UE 20 is continuing, the UE 20 may trust the TA value received from the eNB 10. Furthermore, unlike the first embodiment and the second embodiment, it can be expected that the TA value is transmitted from the eNB 10.

Then, after the transmission of UL data based on the TA value received by the UE 20 by the TA command is terminated, when the DL data addressed to the UE 20 arrives at the eNB 10, the eNB 10 notifies the UE 20 of the incoming call (transmission of message # 0). To do.
Thereby, UE20 which received the said notification of an incoming call starts a contention base RA procedure. Thereafter, when the TA timer 251 of the UE 20 times out between the reception of the message # 2 (processing 1012) and the transmission of the message # 3 (processing 1013), the UE 20 performs any of the following methods 3-1 to 3-3. Thus, UL synchronization is ensured.

(3.1) Method 3-1
The UE 20 stores the TA value received by the message # 2 from the eNB 10 in the course of the RA procedure in the memory 252 as in the method 1-2 (FIGS. 9 to 12) described in the first embodiment. When the TA timer 251 times out before transmitting message # 3 to the eNB 10, the TA value stored in the memory 252 is applied to UL transmission and the TA timer 251 is started.

(3.2) Method 3-2
The UE 20 executes any one of the methods 2-1 to 2-4 described in the second embodiment.
(3.3) Method 3-3 (FIGS. 34 to 37)
As illustrated in FIG. 34 and FIG. 35, when the UE 20 performs RA for the eNB 10 based on TA # 1, a signal including S-TMSI as an example of identification information of the UE 20 in the process of RA. (Message # 3) is transmitted (process 1013).

When the eNB 10 receives the message # 3 from the UE 20 in the RA process before the TA timer 251 of the UE 20 times out (process 1013), the eNB 10 receives a new TA value (TA # 3; The TA command including the second timing adjustment information is transmitted to the UE 20 (process 1009a, process 1208a in FIG. 36).
On the other hand, the UE 20 monitors (monitors) reception of the TA command even while the RA is being executed. For example, after transmitting message # 3 to the eNB 10 (process 1013), the reception of the TA command from the eNB 10 is monitored. If a TA command is received from the eNB 10 during this monitoring (process 1009a, process 1161 in FIG. 37), the UE 20 (timer management unit 25) applies the TA value (TA # 3) of the received TA command to the UL transmission. The TA timer 251 is started (process 1162 in FIG. 37).

  Note that management of UL resources in the UE 20 may be the same as in the first or second embodiment. For example, the UL resource reserved so far may be released at the timing when the DL data arrival notification (message # 0) is received from the eNB 10, or the UL resource is released when the TA timer 251 times out. May be. Also, even if the TA timer 251 times out before TA # 3 is received (the expiration date of TA # 1 has arrived), the UL resources that have been secured up to that point must be maintained (continuously used). Is also possible (process 2005 in FIG. 35).

  Further, when the TA timer times out between the transmission of message # 3 and the reception of message # 4, UE 20 has the same form as in the first embodiment (any one of method 1-1 to method 1-4). Can be applied.

10 Radio base station (eNB)
DESCRIPTION OF SYMBOLS 11 Transmission / reception antenna 12 Transmission / reception part 13 Buffer part 14 UL synchronization determination part 15 Timer management part 151 UL synchronization timer (TA timer)
16 UL resource management unit 20 Radio terminal (UE)
21 Transmission / reception antenna 22 Transmission / reception unit 23 Buffer unit 24 UL synchronization determination unit 25 Timer management unit 251 UL synchronization timer (TA timer)
252 memory 26 UL resource manager

Claims (9)

In a timing adjustment method in a mobile communication system comprising a mobile station and a base station,
The mobile station performs transmission processing based on transmission timing adjustment information,
A plurality of parameters related to PUCCH (Physical Uplink Control Channel) resources used for transmission processing are allocated between the mobile station and the base station,
When the mobile station has first transmission timing adjustment information and is performing connection processing to the base station, in the course of the connection processing including reception of second transmission timing adjustment information, the first expiration of the transmission timing adjustment information and arrives before performing transmission of a signal including identification information of said mobile station, together with not performing the transmission, to release the part of the plurality of parameters related to the allocated PUCCH resources,
The timing adjustment method characterized by the above-mentioned. In a timing adjustment method in a mobile communication system comprising a mobile station and a base station,
The mobile station performs transmission processing based on transmission timing adjustment information,
A plurality of parameters related to PUCCH (Physical Uplink Control Channel) resources used for transmission processing are allocated between the mobile station and the base station,
When the mobile station has first transmission timing adjustment information and is performing connection processing to the base station, in the course of the connection processing including reception of second transmission timing adjustment information, the first When the expiration date of the transmission timing adjustment information arrives before transmission of a signal including the identification information of the mobile station, the transmission is not performed, and parameters related to SRI (Scheduling Request Indicator), CQI (Channel Quality Information) Release parameters related to SRS and parameters related to SRS (Sounding Reference Signal) as a set.
The timing adjustment method characterized by the above-mentioned. In a mobile communication system comprising a mobile station and a base station,
The mobile station
A transmission processing unit that performs transmission processing based on the transmission timing adjustment information;
In the case of having the first transmission timing adjustment information and performing the connection process to the base station, in the course of the connection process including the reception of the second transmission timing adjustment information, the first transmission timing adjustment information When the expiration date comes before transmission of a signal including identification information of the mobile station, the transmission is not performed, and a PUCCH (Physical Uplink) used for transmission processing, which is allocated between the mobile station and the base station. for a plurality of parameters related to control Channel) resources, characterized in that it comprises a control unit for releasing part of a plurality of parameters related to PUCCH resources assigned, the mobile communication system. In a mobile communication system comprising a mobile station and a base station,
The mobile station
A transmission processing unit that performs transmission processing based on the transmission timing adjustment information;
In the case of having the first transmission timing adjustment information and performing the connection process to the base station, in the course of the connection process including the reception of the second transmission timing adjustment information, the first transmission timing adjustment information When the expiration date comes before transmission of a signal including identification information of the mobile station, the transmission is not performed, and a PUCCH (Physical Uplink) used for transmission processing, which is allocated between the mobile station and the base station. A plurality of parameters related to Control Channel) resources, a control unit that releases a parameter related to SRI (Scheduling Request Indicator), a parameter related to CQI (Channel Quality Information), and a parameter related to SRS (Sounding Reference Signal) in a set; A mobile communication system, comprising: The base station
The mobile according to claim 3 or 4, further comprising a UL (Uplink) resource management unit that allocates a plurality of parameters related to PUCCH resources used for transmission processing between the mobile station and the base station. Communications system. The mobile station in a mobile communication system comprising a mobile station and a base station,
A transmission processing unit that performs transmission processing based on the transmission timing adjustment information;
In the case of having the first transmission timing adjustment information and performing the connection process to the base station, in the course of the connection process including the reception of the second transmission timing adjustment information, the first transmission timing adjustment information When the expiration date comes before transmission of a signal including identification information of the mobile station, the transmission is not performed, and a PUCCH (Physical Uplink) used for transmission processing, which is allocated between the mobile station and the base station. for a plurality of parameters related to control Channel) resources, characterized in that it comprises a control unit for releasing part of a plurality of parameters related to PUCCH resource allocated, the mobile station. The mobile station in a mobile communication system comprising a mobile station and a base station,
A transmission processing unit that performs transmission processing based on the transmission timing adjustment information;
In the case of having the first transmission timing adjustment information and performing the connection process to the base station, in the course of the connection process including the reception of the second transmission timing adjustment information, the first transmission timing adjustment information When the expiration date comes before transmission of a signal including identification information of the mobile station, the transmission is not performed, and a PUCCH (Physical Uplink) used for transmission processing, which is allocated between the mobile station and the base station. A plurality of parameters related to Control Channel) resources, a control unit that releases a parameter related to SRI (Scheduling Request Indicator), a parameter related to CQI (Channel Quality Information), and a parameter related to SRS (Sounding Reference Signal) in a set; A mobile station comprising a mobile station. The base station in a mobile communication system comprising a mobile station and a base station,
A UL (Uplink) resource management unit that allocates a plurality of parameters related to PUCCH (Physical Uplink Control Channel) resources used for transmission processing between the mobile station and the base station;
A transmission processing unit that performs transmission processing based on the transmission timing adjustment information;
In the case of having the first transmission timing adjustment information and performing the connection process to the base station, in the course of the connection process including the reception of the second transmission timing adjustment information, the first transmission timing adjustment information expiration date and arrives before performing transmission of a signal including identification information of said mobile station, together with not performing the transmission, and a control unit for releasing part of a plurality of parameters related to PUCCH resources assigned,
A base station, comprising: a reception processing unit that receives a signal transmitted from the mobile station. The base station in a mobile communication system comprising a mobile station and a base station,
A UL (Uplink) resource management unit that allocates a plurality of parameters related to PUCCH (Physical Uplink Control Channel) resources used for transmission processing between the mobile station and the base station;
A transmission processing unit that performs transmission processing based on the transmission timing adjustment information;
In the case of having the first transmission timing adjustment information and performing the connection process to the base station, in the course of the connection process including the reception of the second transmission timing adjustment information, the first transmission timing adjustment information If the expiration date arrives before transmission of a signal including identification information of the mobile station, the transmission is not performed, parameters related to SRI (Scheduling Request Indicator), parameters related to CQI (Channel Quality Information), and A control unit for releasing parameters related to SRS (Sounding Reference Signal) as a set;
A base station, comprising: a reception processing unit that receives a signal transmitted from the mobile station.

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