CN102858021B - Accidental access method, wireless communication system, wireless terminal and base station - Google Patents

Abstract

The invention provides accidental access method, wireless communication system, wireless terminal and base station.Accidental access method in a kind of wireless communication system, above-mentioned wireless communication system communicates between base station with wireless terminal, above-mentioned accidental access method comprises the steps: in above-mentioned wireless terminal, carries out employing the 1st Stochastic accessing process of the 1st random access guiding or employing the 2nd Stochastic accessing process of the 2nd random access guiding received from above-mentioned base station.

Description

Random access method, wireless communication system, wireless terminal and base station

This application is a divisional application of an invention patent application with an application date of August 10, 2007, an application number of 200780100236.0, and an invention title of "Random Access Method in a Wireless Communication System, a Wireless Communication System, a Wireless Terminal, and a Base Station Device" .

technical field

The present invention relates to a random access method in a wireless communication system, a wireless communication system, a wireless terminal and a base station device. The present invention is very suitable for example in next generation mobile communication systems.

Background technique

With regard to mobile communication systems such as mobile phones, the third-generation system based on the CDMA method is currently in service, and the next-generation mobile communication system that can perform higher-speed communication is being promoted through 3GPP (3rd Generation Partnership Project: 3rd Generation Partnership Project) (R) (LTE: Long Term Evolution, Long Term Evolution) research (see Non-Patent Document 1 described later). Among them, in addition to speeding up the transmission rate, reduction in transmission delay is also considered.

In a mobile communication system, when a base station device (evolvedNodeB: eNB) starts communication with a mobile station device (User Equipment: UE) as a wireless terminal, it is necessary to prepare a channel for the UE to transmit first. In 3GPP, this is called a random access channel (RACH), and the communication initiation procedure of the RACH is called random access (see Non-Patent Document 2 described later).

The RACH includes minimum information for the eNB to recognize the transmission from the UE. In addition, since RACH is used at the beginning of communication and a separate channel (or shared channel) is used for subsequent communication, it can be used in common among UEs unless multiple UEs use it at the same time. Then, by applying an identifier called a signature to the RACH, the eNB can identify UEs that are simultaneously transmitting on the RACH.

Random access is performed in the following four cases, namely: (1) the case of sending initial data; (2) the case of establishing uplink synchronization when downlink data is generated; (3) the case of requesting to send uplink data when uplink data is generated ; (4) A case where synchronization is obtained with the movement destination base station when handover is performed. Also, the direction from the eNB to the UE is "downlink" (downlink: DL), and the opposite direction is uplink (uplink: UL).

Here, when (1) transmitting initial data and (3) transmitting uplink data, UE randomly selects one of usable signatures (preambles) to use (ContentionBasedRandomAccessProcedure: contention-based random access procedure). Therefore, although the probability is low, it may also cause multiple UEs to simultaneously use the same signature for transmission.

On the other hand, when (2) downlink data is transmitted, the eNB assigns a separate signature to the UE in advance. In the case of (4) handover, the connection is cut off instantaneously or the communication is cut off depending on the occasion. A method of assigning a separate signature to the UE to be handed over (Non-contentionBasedRandomAccessProcedure: non-contention-based random access procedure).

(a) Contention-based random access procedure

FIG. 20 shows an example of the random access procedure described in the above-mentioned Non-Patent Document 2 for the cases of (1) and (3) above.

When uplink data is generated, the UE sends a message (RandomAccessPreamble: Random Access Preamble) #1-1 (uplink transmission request) including a randomly selected signature to the eNB through the RACH (step S101 ). At this time, multiple UEs will use the same signature to start sending at the same time, and competition may occur. However, even if contention occurs, the eNB cannot recognize valid UE IDs at this stage, and therefore cannot know which UEs have generated the contention of signatures.

The eNB that has received the above message #1-1 (signature) will respond to the received response message (RandomAccessResponse: Random Access Response) #1-2 of the above message #1-1 and the synchronization signal used for uplink communication, sending permission Wait for a reply together (step S102). The response message #1-2 is replied to multiple UEs in the case that multiple UEs transmit through RACH at the same time.

Next, the UE that has received the above response message #1-2 sends its own station ID through message (Scheduled Transmission) #1-3, and requests the eNB for scheduling of UL communication (step S103).

By receiving this message #1-3, the eNB can identify a valid UE ID (hereinafter also referred to as a terminal ID), so it can identify which UE has a signature contention, and if there is a contention, send the The UE sends a message (ContentionResolution: contention resolution) #1-4 to resolve the contention (step S104).

(b) Non-contention based random access procedure

FIG. 21 shows an example of a random access procedure (non-contention-based random access procedure) described in the above-mentioned Non-Patent Document 2 and used in the cases of (2) and (4) above.

First, the eNB pre-assigns individual signatures to UEs to be managed through message (Random Access Preamble assignment: random access preamble assignment) # 2 - 1 (step S201 ).

The UE makes a UL synchronization request to the eNB using the individual signature assigned by the eNB through the above message #2-1. That is, the UE transmits message #2-2 including the individual signature to the eNB through the RACH (step S202).

After receiving the message #2-2, the eNB replies with a response message #2-3 to the message together with a synchronization signal for uplink communication, transmission permission, etc. (step S203).

Non-Patent Document 1: 3GPP, "Requirements for EvolvedUTRA (E-UTRA) and Evolved UTRAN (E-UTRAN)", TR25.913V7.3.0, Release7, March2006

Non-Patent Document 2: 3GPP, "EvolvedUniversalTerrestrialRadioAccess (E-UTRA) and EvolvedUniversalTerrestrialRadioAccessNetwork (E-UTRAN)", TS36.300, Release8, V8.1.0, June2007

As mentioned above, in Non-Patent Document 2, two procedures are studied regarding random access, such as the case of establishing uplink synchronization when the above (2) generates downlink data and performing uplink data when the above (3) generates uplink data In the case of sending a request, processes different from each other are performed simultaneously.

As described above, when different processes are performed simultaneously, separate resources (such as the above-mentioned signature) are required for each process, and thus two types of signatures may be allocated during the process, resulting in wasteful use of signatures.

Contents of the invention

One of the objects of the present invention is to selectively perform any one of the above random accesses.

In addition, another object of the present invention is to realize effective utilization of resources such as signatures used in the random access described above.

In addition, it is not limited to the above-mentioned purpose, and one of the other purposes of the present invention is to obtain the effect brought about by each structure shown in the specific embodiments described later, that is, the effect that cannot be obtained by the prior art.

In order to achieve the above object, the present invention uses the following "random access method in a wireless communication system, a wireless communication system, a wireless terminal, and a base station device".

(1) That is, the random access method in the wireless communication system of the present invention is a random access method in a wireless communication system including a base station apparatus and a wireless terminal, wherein the wireless terminal detects the first random access When the first information and the second information for the second random access received from the base station apparatus, either one of the first information and the second information is selected.

(2) Here, in the wireless terminal, the first information is generated with the generation of uplink data toward the base station device, and the second information is generated with downlink data from the base station device toward the wireless terminal. generated and received from the above-mentioned base station device.

(3) In addition, it may also be configured such that, during or after a random access process using the selected information, the wireless terminal transmits to Transmission of the third information of the above-mentioned base station apparatus.

(4) Furthermore, it may also be configured such that the wireless terminal stops performing the second random access, and sends an uplink synchronization request requesting establishment of uplink communication synchronization in order to receive downlink data during the process of the first random access. The information is transmitted to the base station apparatus as the third information.

(5) In addition, it may also be configured such that the wireless terminal stops performing the second random access, and uses the uplink data transmission request information requesting uplink data transmission during or after the second random access process is completed as The third information is transmitted to the base station device.

(6) Furthermore, the uplink synchronization request information may be added to an uplink message to be transmitted to the base station apparatus in the first random access procedure.

(7) In addition, the above-mentioned uplink data transmission request information may be added to an uplink message to be transmitted to the above-mentioned base station apparatus in the above-mentioned second random access procedure.

(8) Furthermore, the base station apparatus may be configured such that, after detecting the presence of the first information received from the wireless terminal and the second information assigned to the wireless terminal, when receiving the In the case of the third information, management of the above-mentioned first information or the above-mentioned second information is released.

(9) In addition, the random access method in the wireless communication system of the present invention is a random access method in a wireless communication system having a base station device and a wireless terminal, wherein the wireless terminal is accompanied by generation of uplink data directed to the base station device Before generating the first information for the first random access, the second information for the second random access is received from the base station device with the generation of downlink data from the base station device, and when using the second information During or after the second random access procedure, the third information transmitted to the base station device during the first random access procedure is transmitted.

(10) Furthermore, the wireless communication system of the present invention is a wireless communication system including a base station device and a wireless terminal, wherein the wireless terminal selects the first information for the first random access and the information received from the base station device for the first random access. In any one of the second information of the second random access, the base station apparatus releases management of the unselected information among the first information and the second information.

(11) In addition, the wireless terminal of the present invention includes: generating means for generating first information for performing first random access to the base station device; and receiving means for receiving from the base station device information for performing the first random access to the base station device; 2 second information for random access; and a selection unit for selecting either one of the first information and the second information.

(12) Here, it may also be configured that the wireless terminal further has a sending unit, and the sending unit maintains a random access corresponding to the information selected by the selection unit, and implements it in another random access not selected by the selection unit. transmission of the third information to be transmitted to the above-mentioned base station apparatus during such a random access procedure.

(13) In addition, it may also be configured such that the selection unit selects the first information, and the sending unit transmits uplink synchronization request information requesting establishment of uplink communication synchronization in order to receive downlink data during the first random access process It is transmitted to the base station apparatus as the third information.

(14) Furthermore, it may also be configured such that the selection unit selects the second information, and the transmission unit uses uplink data transmission request information requesting uplink data transmission as the third information during the second random access process. sent to the above-mentioned base station device.

(15) In addition, the transmission unit may be configured to add the uplink synchronization request information to an uplink message to be transmitted to the base station apparatus during the first random access procedure.

(16) Furthermore, the transmission unit may be configured to add the uplink data transmission request information to an uplink message to be transmitted to the base station apparatus in the second random access procedure.

(17) In addition, the base station apparatus of the present invention includes: a management unit that manages the first information for the first random access received from the wireless terminal and the first information for the second random access transmitted to the wireless terminal. 2 information; a judging unit that judges which of the first information and the second information is selected based on the third information received from the wireless terminal; and a control unit that maintains and is judged as selected by the judging unit One type of information corresponds to one type of random access, and the control corresponding to the above-mentioned third information is implemented.

(18) Here, the judging unit may judge that the first information is selected in the wireless terminal when the third information is uplink synchronization request information requesting establishment of uplink communication synchronization in order to receive downlink data.

(19) In addition, when the third information is uplink data transmission request information requesting uplink data transmission, the determination unit may determine that the second information is selected in the wireless terminal.

(20) Furthermore, the control unit may be configured such that the management unit releases the management of another type of information that is determined not to be selected by the determination unit.

According to the above-mentioned present invention, any one of the above-mentioned multiple random accesses can be selected and executed.

In addition, effective use of resources such as signatures used in the random access described above can be realized. Interference from the Random Access Channel (RACH) can also be suppressed.

Description of drawings

FIG. 1 is a functional block diagram of a base station (eNB) according to the first embodiment of the present invention.

FIG. 2 is a functional block diagram of a mobile station (UE) according to the first embodiment of the present invention.

FIG. 3 is a sequence diagram illustrating a random access procedure (method) according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating the operation of the eNB when the random access procedure shown in FIG. 3 is performed.

FIG. 5 is a flowchart illustrating the operation of the UE when the random access procedure shown in FIG. 3 is performed.

Fig. 6 is a sequence diagram illustrating a case where different random access procedures are performed simultaneously.

FIG. 7 is a sequence diagram illustrating a random access procedure (method) according to the second embodiment of the present invention.

FIG. 8 is a flowchart illustrating the operation of the eNB when the random access procedure shown in FIG. 7 is performed.

FIG. 9 is a flowchart explaining the operation of the UE when the random access procedure shown in FIG. 7 is performed.

FIG. 10 is a sequence diagram illustrating a first modified example of the second embodiment.

FIG. 11 is a sequence diagram illustrating a second modified example of the second embodiment.

FIG. 12 is a sequence diagram illustrating a random access procedure (method) according to the third embodiment of the present invention.

FIG. 13 is a flowchart illustrating the operation of the eNB when the random access procedure shown in FIG. 10 is performed.

FIG. 14 is a flowchart illustrating the operation of the UE when the random access procedure shown in FIG. 10 is performed.

FIG. 15 is a sequence diagram illustrating a random access procedure (method) according to the fourth embodiment of the present invention.

FIG. 16 is a flowchart illustrating the operation of the eNB when the random access procedure shown in FIG. 13 is performed.

FIG. 17 is a flowchart illustrating the operation of the UE when the random access procedure shown in FIG. 13 is performed.

FIG. 18 is a sequence diagram illustrating a random access procedure (method) according to the fifth embodiment of the present invention.

FIG. 19 is a sequence diagram illustrating a random access procedure (method) according to the sixth embodiment of the present invention.

FIG. 20 is a sequence diagram illustrating a conventional random access procedure (contention-based random access procedure).

FIG. 21 is a sequence diagram illustrating a conventional random access procedure (non-contention-based random access procedure).

Symbol Description:

10 base station (eNB); 11 antenna; 12 transceiver unit; 13 buffer unit; 14 determination unit; 15 signature management unit; 16 radio resource management unit; 20 mobile station (UE); 21 antenna; 24 signature management unit; 25 access determination unit; 26 identifier granting unit

detailed description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and it is of course possible to implement various modifications without departing from the gist of the present invention.

[1] First Embodiment

FIG. 1 is a functional block diagram of a base station device (eNB) according to the first embodiment of the present invention, and FIG. 2 is a functional block diagram of a mobile station device (UE) according to the first embodiment of the present invention. These eNB10 and UE20 constitute wireless communication. system. Also, a plurality of eNB10 and UE20 may exist in the wireless communication system described above. In addition, about the structure shown in these FIG. 1 and FIG. 2, unless otherwise specified, it is the same also in the following 2nd - 4th embodiment. Furthermore, the base station device 10 in this example is configured as an eNB in LTE that has some or all of the functions of a radio network controller (RNC), and may be a base station that is a generation earlier than LTE (without the function of an RNC) . In addition, as long as it is a base station that specifies two methods of a contention-based random access procedure and a non-contention-based random access procedure, it may be a base station of any system.

(Description of eNB)

Focusing on the functions of its main parts, the eNB 10 shown in FIG. 1 includes, for example, an antenna 11 , a transceiver unit, a buffer unit 13 , a determination unit 14 , a signature management unit 15 , and a radio resource management unit 16 .

Here, the antenna 11 receives an uplink radio signal from the UE 20 and transmits a downlink radio signal toward the UE 20 . The antenna 11 is used for sending and receiving at the same time, and can also be installed separately for sending and receiving.

The transceiver unit (transmitter, receiver) 12 performs predetermined reception processing on the uplink wireless signal received via the antenna 11 , and performs predetermined transmission processing on data (downlink data) from the buffer unit 13 .

The reception processing described above includes, for example, low-noise amplification, frequency conversion to baseband frequency (down-conversion), gain adjustment, demodulation by a predetermined demodulation method, decoding by a predetermined decoding method, and the like. On the other hand, the above-mentioned transmission processing includes: encoding the above-mentioned uplink data using a predetermined coding method, modulating the coded data using a predetermined modulation method (QPSK and 16QAM, etc.), generating a predetermined radio frame, Perform frequency conversion (up-conversion), power amplification, etc. The radio frame described above can be applied to, for example, OFDMA and a radio frame based on OFDMA.

The buffer unit 13 temporarily holds the downlink data addressed to the UE 20 under the control of the signature management unit 15 , and the determination unit (discrimination unit) 14 has the following function: based on the uplink data (message) received by the transceiver unit 12 , determine Whether or not a UL synchronization request and a UL scheduling request is requested from the UE 20 determines which of the random signature and the individual signature is selected in the UE 20 .

In addition, in this example, the random signature refers to a signature (first information) randomly generated in UE 20 , and the individual signature refers to a signature (second information) assigned (transmitted) by eNB 10 to UE 20 . In addition, the above-mentioned determination (discrimination) method will be described in detail later.

The signature management unit (management unit) 15 manages a signature (RandomAccessPreamble: Random Access Preamble) (hereinafter also referred to as a preamble) for random access (procedure), and generates a The downlink message also has the function of assigning and releasing signatures to UE20. In addition, the above release is performed according to the determination result of the determination unit 14 .

The radio resource management unit 16 manages UL and DL radio resources [channel frequency and time (transmission timing), etc.] and their allocation for communication with UE 20 (including communication during random access), for example, in the above-mentioned OFDMA In this case, it has the function of managing the arrangement (mapping) of two-dimensional transmission and reception areas (called bursts) defined by subchannel frequency and symbol time.

In addition, the radio resource management unit 16 also functions as a control unit that performs control corresponding to an uplink message (third information) that is a random access message corresponding to a signature not selected in the UE 20 . should be received from UE20 during the process.

(Description of UE)

On the other hand, UE20 shown in FIG.

Wherein, the antenna 21 receives a downlink wireless signal from the eNB10, and sends an uplink wireless signal to the eNB10. The antenna 21 is also used for transmission and reception at the same time, and may be installed separately for transmission and reception.

The transceiver unit (sending unit, receiving unit) 22 performs predetermined receiving processing on the downlink wireless signal received through the antenna 21, and performs the predetermined reception processing on the data (uplink data) from the buffer unit 23 and the uplink message sent to the eNB through the identifier assigning unit 26 (Random Access Preamble and Scheduled Transmission Message) perform scheduled transmission processing.

In UE 20 , the reception processing includes, for example, low-noise amplification, frequency conversion to baseband frequency (down-conversion), gain adjustment, demodulation by a predetermined demodulation method, decoding by a predetermined decoding method, and the like. On the other hand, the above-mentioned transmission processing includes: encoding the above-mentioned uplink data using a predetermined coding method, modulating the coded data using a predetermined modulation method (QPSK and 16QAM, etc.), and complexing the uplink data to a predetermined radio frame. Use (mapping), frequency conversion to radio frequencies (up-conversion), power amplification, etc.

The buffer unit 23 temporarily holds uplink data addressed to the eNB 10 under the control of the signature management unit 24 that manages a signature (random access preamble) used for random access processing (procedure).

The access determination unit 25 cooperates with the signature management unit 24 to generate a predetermined message used in the random access procedure, wherein the access determination unit 25 has the following function: monitor (confirm) whether the multiplexing allocation of the signature occurs, that is, whether There are individual signatures distributed by the eNB 10 and random signatures randomly generated by the own station (signature management unit 24 ), and it is determined which signature is valid at the time of multiplex distribution.

The identifier assigning unit 26 has a function of assigning the following message and information (identifier, flag, etc.) to the uplink message (for example, a message notifying the terminal ID, etc.) UE20 also generates a message requesting transmission of uplink data (UL scheduling), and this information indicates that UL synchronization confirmation for the UL synchronization request required for downlink data reception due to the arrival of downlink data at eNB10 is also included. In addition, UL synchronization acknowledgment refers to the fact that UE 20 notifies eNB 10 (acknowledgment response) that UL timing information from eNB 10 has been correctly received and thus UL synchronization can be ensured.

(Description of random access procedure)

Next, the operation (random access procedure) of the wireless communication system of this example configured as above will be described in detail with reference to FIGS. 3 to 5 . Moreover, FIG. 3 is a sequence diagram illustrating the random access procedure (method) of this example, FIG. 4 is a flowchart illustrating the operation of eNB10 when implementing the random access procedure of this example, and FIG. 5 is a flowchart illustrating the random access procedure of this example. Flowchart of operations in UE 20 at the time of access procedure.

20 and 21 , in the following description, the messages shown with reference signs #1-1 to #1-4 indicate that the original contention-based random access procedure (first random access) Among the messages used in , the messages denoted by #2-1 to #2-3 represent messages originally used in the non-contention based random access procedure (second random access).

First, if uplink data is generated in UE 20 and the uplink data is held in buffer unit 23 (step B1 in FIG. 5 ), UE 20 generates and stores a random signature (random access preamble) through signature management unit 24 (step B1 in FIG. 5 ). B2). That is, the signature management unit 24 has a function as generating means for generating a signature used for contention-based random access to be performed when uplink data addressed to the eNB 10 is generated.

Then, UE20 generates random access preamble message (uplink transmission request) #1-1 including the signature through access determination unit 25, and transmits it to eNB10 from antenna 21 via transceiver unit 22 (step S1a in FIG. 3 and step S1a in FIG. 5 B3).

If the eNB10 receives the above-mentioned uplink transmission request message #1-1, it will reply the response message (random access response) #1-2 to the above-mentioned uplink transmission request message #1-1 received, and also send a message for uplink communication Synchronization signal and transmission permission etc. (step S2 in Fig. 3). The response message #1-2 is returned to the multiple UEs 20 when they are simultaneously transmitted by the multiple UEs 20 through the RACH.

Here, before sending this response message #1-2, in eNB10, the downlink data addressed to UE20 arrives from the higher-level device (there is downlink data in buffer unit 13) (step A1 in FIG. Due to reasons such as receiving processing, the above-mentioned uplink transmission request message #1-1 sent by UE20 cannot be recognized.

In this case, the eNB 10 generates and stores a signature (individual signature: second information) that should be used by the destination UE 20 of the above-mentioned downlink data for random access (UL synchronization request) through the signature management unit 15 (step A2 in FIG. 4 ), This individual signature is transmitted to the above-mentioned destination UE 20 via the transmitting and receiving unit 12 by a signature allocation message (random access preamble allocation) # 2 - 1 (step S1 b in FIG. 3 and step A3 in FIG. 4 ).

When the transmission of these uplink transmission request message #1-1 (step S1a in FIG. 3 ) and signature allocation message #2-1 (step S1b in FIG. 3 ) is completed, the eNB 10 cannot identify "which UE 20 is using which signature". That is, it is impossible to identify which UE 20 is issued with two signatures (RandomPreamble and DedicatedPreamble: Random Preamble and Dedicated Preamble). This is because, in the above-mentioned Non-Patent Document 2, information for identifying UE 20 (terminal ID) is not included in any message.

According to the above-mentioned non-patent document 2, the terminal ID can be included in the message (scheduled transmission) #1-3, so in this case, it can be identified in the eNB10 which UE20 uses which signature should be received from the UE20 After message #1-3 (step S3 of Fig. 3).

On the other hand, in UE 20, regardless of whether eNB 10 has been notified of the terminal ID of own station 20, after the completion of transmission of uplink transmission request message #1-2 (step S1a in FIG. 3 ) and signature assignment message #2-1 ( At the stage of step S1b) in Figure 3, both the random signature (random preamble) generated by the station and the individual signature (Dedicated Preamble: dedicated preamble) distributed from eNB10 can be identified (detected), that is, the above two random access The generation of entry.

As described above, when a plurality of signatures are issued to one UE 20 , UE 20 determines which signature to use. That is, if UE 20 allocates (receives) an individual signature from eNB 10 in step S2 (step B4 in FIG. ) for multiplexing allocation (step B5 of Figure 5).

As a result, if multiplexing assignment occurs (Yes branch in step B5), UE20 (access determination unit 25) ignores the individual signature assigned from eNB10 (step S1c in FIG. 3 and step B6 in FIG. The generated random signature is selected as a valid signature. That is, the access determination unit 25 has a function as a selection means for selecting any one of the above-mentioned two signatures. And, when no multiplexing assignment occurs, the random signature generated by the own station is valid in UE 20 (No branch of step B5).

Thereby, the random access procedure (contention-based random access procedure) based on the random signature generated in UE 20 becomes effective, and UE 20 continues the contention-based random access procedure.

That is, UE20 generates message #1-3 and sends it to eNB10 (step S3 in FIG. 3 and step B7 in FIG. 5 ). At this time, since UE 20 recognizes that the downlink data addressed to its own station has arrived at eNB 10 by receiving the above-mentioned signature assignment message #2-1, it is preferable that the identifier granting unit 26 will indicate "also used for receiving downlink data" The information (identifier or label) of "UL Synchronization Confirmation" is assigned to the message #1-3 and then sent. The so-called UL synchronization acknowledgment refers to confirming and responding to the fact that UE 20 has correctly received the UL timing information included in the message (random access response) #1-2, thereby ensuring UL synchronization.

That is to say, the UL synchronization request (third information) that should be sent to eNB10 in the non-selected non-contention based random access procedure is a message for receiving UL timing information from eNB10 to synchronize UL, but UE20 has This timing information is obtained in the selected contention-based random access procedure #1-2. Then, in order to notify the eNB10 that UL synchronization has been achieved, the UL synchronization confirmation is attached to the message #1-3 to be sent and sent to the eNB10.

Among them, since the eNB10 can identify the UE20 to which the signature is double-assigned at the time of receiving the message #1-3 as described above, even if the above-mentioned identifier or mark is not explicitly assigned, it can be judged as the message # from the UE20 by default. 1-3 are combined with UL synchronization request.

If eNB10 recognizes the reception of the above-mentioned message (with UL synchronization confirmation) #1-3 (YES branch of step A4 in FIG. If it is ignored (the random signature generated by the UE 20 is prioritized), the signature management unit 15 releases the individual signature assigned to the UE 20 (step S3 - 1 in FIG. 3 and step A5 in FIG. 4 ).

Therefore, the random access procedure based on the individual signature assigned by eNB10 (non-contention-based random access procedure) can be stopped, and the individual signature assigned to UE20 can be released (early) in the middle of the random access procedure, and effective signature can be realized. use. And, when it is recognized that the above-mentioned message #1-3 has both UL synchronization confirmation (No in step A4), it belongs to the situation that the downlink data has not arrived and only the normal uplink data communication has occurred, so the eNB10 carries out the message # Transmission of 1-4 (step A7).

In addition, the eNB 10 starts processing (control) corresponding to the UL synchronization confirmation (third information), such as scheduling of downlink data, through the radio resource management unit 16 (step A6 in FIG. 4 ).

In addition, eNB10 can recognize that the response (random access preamble) to signature assignment message #2-1 may not be sent from UE20 by receiving the above-mentioned message (also UL synchronization confirmation) #1-3, so it can avoid unnecessary Send signature assignment message #2-1. Furthermore, eNB10 receives messages #1-3 used in the contention-based random access procedure irrespective of assigning individual signatures, so it can recognize that uplink data has also been generated in UE20.

By receiving the above message (with UL synchronization confirmation) #1-3, the eNB10 can know the ID of the valid UE20, so it can identify which UE has a signature competition, and send a contention resolution (ContentionResolution) message to the corresponding UE20 #1-4, so as to resolve the contention (step S4 in FIG. 3 ).

As described above, according to the random access method of this example, even if there is a UE20 that has generated uplink data and downlink data in the same period, the UE20 will still select the signature generated by the station and continue to perform contention-based random access. For example, as shown in FIG. 6 , the above two random access steps will not be carried out to the end for any UE 20 at the same time. Therefore, the level of control of random access can be simplified, and effective use of signatures for random access can be realized. Furthermore, it is also possible to suppress interference of a random access channel (RACH).

Wherein, the above two random access steps may also be performed simultaneously. Therefore, for example, when the above-mentioned message (combined with UL synchronization confirmation) #1-3 competes with another UE, the UE20 can know that the contention has occurred by referring to the contention resolution message #1-4 notified from the eNB10. At this time, if the non-contention-based random access is continued, it may take time to ensure UL synchronization. Therefore, it is also possible to perform the non-contention-based random access at the same time using the individual signature assigned from eNB10 through the above message #2-1. access. However, in this case, it is necessary to set a longer validity period of the individual signature for the UE 20 .

In addition, during the continuation of the non-contention based random access, since the information (UL synchronization acknowledgment) that should be sent to the eNB10 during the non-selected non-contention based random access is sent to the eNB10, it is possible to And reliably implement the sending process of uplink data and the receiving process of downlink data.

Furthermore, the above-mentioned UL synchronization request is shared with the uplink message #1-3 sent to the eNB10 during the selected contention-based random access process, so that there is no need to prepare (define) a separate uplink message in the UL synchronization confirmation, which can Realize effective utilization of wireless resources.

In addition, in this example, compared with the second embodiment described later, the number of messages transmitted and received between eNB10 and UE20 can be reduced, so that further effective use of radio resources can be realized, and retransmission control (HARQ: HybridAutomaticRepeatreQuest, Hybrid auto-retransmit) shortened bug fixes.

[2] Second Embodiment

7 is a sequence diagram illustrating the random access procedure according to the second embodiment of the present invention, FIG. 8 is a flowchart illustrating the operation of eNB 10 when the random access procedure according to the second embodiment is performed, and FIG. 9 is a flowchart illustrating the procedure of the second embodiment. 2. Flowchart of operations in the UE 20 when performing the random access procedure according to the embodiment.

In the present embodiment, when the above-mentioned multiplexing allocation of the preamble occurs, the UE 20 ignores the signature (first information) generated by its own station, and selects the individual signature (second information) allocated from the eNB 10 . Therefore, the non-contention based random access procedure will continue.

First, when UE 20 generates uplink data and holds the uplink data in buffer unit 23 (step B11 in FIG. 9 ), UE 20 generates and stores a random signature (random access preamble) through signature management unit 24 (step B11 in FIG. 9 ). Step B12), the access determination unit 25 generates an uplink transmission request (random access preamble) message #1-1 including the signature, and sends it from the antenna 21 to the eNB10 via the transceiver unit 22 (step S1a in FIG. step B13).

If eNB10 receives the above-mentioned uplink transmission request message #1-1, it will send the response message (random access response) #1-2 to the received above-mentioned uplink transmission request message together with the synchronization signal and transmission permission for uplink communication, etc. Reply together (step S2 of FIG. 7 ). The response message #1-2 is returned to the plurality of UEs 20 when the plurality of UEs 20 transmit through the RACH at the same time.

Here, in this example, before this response message #1-2 is transmitted, in eNB10, since the downlink data addressed to UE20 arrives from the higher-level device (there is downlink data in the buffer unit 13) (step A11 in FIG. 8 ) and the receiving process cannot be terminated, the above-mentioned uplink transmission request message #1-1 sent by the UE20 cannot be recognized.

In this case, the eNB 10 generates and stores the signature (individual signature) that should be used by the destination UE 20 of the above-mentioned downlink data for random access (UL synchronization request) through the signature management unit 15 (step A12 in FIG. 8 ), and distributes the message through the signature (Random Access Preamble Assignment) # 2 - 1 transmits the individual signature to the above-mentioned destination UE 20 via the transmitting and receiving unit 12 (step S1 b in FIG. 7 and step A13 in FIG. 8 ).

UE 20 having received the signature allocation message #2-1 transmits message (random access preamble) #2-2 including the individual signature allocated by eNB 10 to eNB 10 via RACH (step S2a in FIG. 7 ).

Here, UE20 can recognize the presence of its own station at the stage when the transmission of uplink transmission request message #1-1 (step S1a in FIG. 7 ) and signature allocation message #2-1 (step S1b in FIG. 7 ) is completed. Both the generated random signature and the individual signature assigned by the eNB10.

Then, UE 20 judges which signature to use. That is, in the UE 20 of this example, if there is a signature allocation from the eNB 10 in the above step S2 (step B14 in FIG. 9 ), the access determination unit 25 cooperates with the signature management unit 24 to check whether two signatures (preambles) are generated. Multiplexing allocation (step B15 of FIG. 9 ).

As a result, if multiplexing allocation occurs (Yes branch in step B15), UE20 ignores the random signature generated by itself (the signature sent to eNB10) (step S1d in FIG. 7 and step B16 in FIG. 9 ), and eNB10 will allocate The individual signatures of are selected as valid signatures. And, in the case where no multiplexing allocation occurs, the individual signature is also valid (No branch of step B15).

Thus, the random access procedure based on the individual signature assigned by the eNB 10 (non-contention-based random access procedure) continues.

Thereafter, UE20 generates message #1-3 and sends it to eNB10 (step S3 in FIG. 7 and step B17 in FIG. 9 ). At this time, since the UE 20 also generates uplink data, it is preferable that the identifier giving unit 26 give information (identifier or flag) indicating "a message (UL scheduling request) that also requests transmission (scheduling) of uplink data" is given to the UE 20. Send this message #1-3 again.

That is, the UL synchronization request (third information) that should be transmitted to eNB10 during the contention-based random access that is not selected is assigned to message #1-3 addressed to eNB10 and then transmitted to eNB10.

However, since the eNB 10 can identify the UE 20 to which the signature is double-assigned when receiving the message #1-3, it can be judged by default that the message #1-3 is from the UE 20 even if the above-mentioned identifier or mark is not explicitly assigned. Compatible with UL synchronization requests.

In eNB10, if it recognizes the reception of the above message #1-3 (combined with UL synchronization confirmation) (step A14 of FIG. 8 is branch), it can be judged that the individual signature assigned to the UE20 is valid in the UE20 , and thus the random signature received and managed from the UE 20 is released in the signature management unit 15 (step S3 - 2 in FIG. 7 and step A15 in FIG. 8 ).

Therefore, the random access procedure based on the random signature generated by the UE 20 (contention-based random access procedure) is invalid (stopped), and the random signature can be released (early) in the middle of the random access procedure, enabling effective use of the signature.

Then, the eNB 10 implements UL radio resource allocation by the radio resource management unit 16 as processing (control) corresponding to the above-mentioned UL scheduling request (step A16 in FIG. 8 ). Also, this example is an example in which individual signatures are valid, so it is limited to the UE 20, and the contention resolution message #1-4 in the contention-based random access step does not need to be sent and can be stopped (step S4 and FIG. Step A17 of 8). In addition, when it is recognized that the above-mentioned message #1-3 also serves as a UL scheduling request, the eNB 10 ends the process (No branch of step A14 in FIG. 8 ).

As mentioned above, according to the random access method of this example, even if there is UE20 that has generated uplink data and downlink data in the same period, UE20 will still select the signature assigned by eNB10 and continue to perform non-contention-based random access. Under the circumstances, it will not happen that the above two random access steps are carried out to the end at the same time for a certain UE20. Therefore, the level of control of random access can be simplified, and effective use of signatures for random access can be realized. Furthermore, it is also possible to suppress RACH interference.

In addition, when non-contention-based random access continues, UE20 sends eNB10 the information (UL synchronization confirmation) that should be sent to eNB10 during the non-selected contention-based random access. And reliably implement the sending process of uplink data and the receiving process of downlink data.

Furthermore, the UL synchronization request to the eNB 10 is shared with the uplink messages #1-3, so that there is no need to prepare (define) a separate uplink message in the UL synchronization confirmation, and efficient use of radio resources can be realized.

Furthermore, in the first and second embodiments above, it is assumed that after the UE 20 transmits the uplink transmission request message # 1-1 to the eNB 10, the eNB 10 transmits the signature assignment request message # 2-1 to the UE 20. However, even in When these messages #1-1 and #2-1 are transmitted in the reverse order, since the point of generating multiplexed signatures does not change, it is only necessary to make any one of the signatures valid.

(2.1) First modified example

For example, as shown in FIG. 10 , the message serving as the UL scheduling request for the eNB 10 may also be the message (RandomAccessPreamble: Random Access Preamble) #2-2 sent in step S2a of FIG. 7 above.

In this case, since the UE 20 does not need to send the message #1-3, the sending of the message #1-3 can be stopped (step S3). Therefore, wasteful transmission of uplink messages can be avoided, and effective utilization of uplink radio resources (bandwidth) can be realized.

In addition, since eNB10 cannot identify (that is, cannot manage) which UE 20 uses which preamble without receiving message #1-3, there is no need to release the preamble (step S3-2 in FIG. 7 does not need to be executed). Therefore, the processing load of preamble management in the eNB 10 can be reduced.

(2.2) Second modified example

Furthermore, the above-mentioned request for UL scheduling of eNB10 may not be sent when the non-contention-based random access step is continued, for example, as shown in FIG. ), is transmitted together with a response (ACK/NACK signal) to message #2-3 (step S5 in FIG. 11 ). It can also be sent as a separate uplink message after sending the message #2-3.

[3] Third Embodiment

FIG. 12 is a sequence diagram illustrating the random access procedure according to the third embodiment of the present invention, FIG. 13 is a flowchart illustrating the operation of eNB 10 when the random access procedure according to the third embodiment is performed, and FIG. 14 is a flowchart illustrating the operation of the third embodiment. This is a flow chart of the operation of UE 20 when the random access procedure according to the embodiment is performed.

This embodiment differs from the first and second embodiments, and a case will be described in which uplink data is generated in UE 20 in a state where an individual signature is assigned to UE 20 .

That is, when the downlink data destined for UE20 arrives at eNB10 (the downlink data exists in the buffer unit 13) from the upper device (step A21 in FIG. The signature (individual signature) that should be used for random access (UL synchronization request) (step A22 in FIG. 13 ), and the individual signature is sent to The above-mentioned destination UE20 (step S11 in FIG. 12 and step A23 in FIG. 13 ).

Upon receiving the above-mentioned signature assignment message #2-1, the UE 20 stores and manages the individual signature assigned as above by the signature management unit 24 (step B21 in FIG. 14 ).

Thereafter, if uplink data is generated in UE 20 and the uplink data is held in buffer unit 23 (step B22 in FIG. 14 ), UE 20 (signature management unit 24 ) does not perform a random signature as in the first and second embodiments. generated (step S12 in FIG. 12 and step B23 in FIG. 14 ).

Instead, UE20 generates UL synchronization request (random access preamble) message # 2 - 2 including the individual signature assigned by eNB10 through access determination unit 25 , and transmits it to eNB10 from antenna 21 via transceiver unit 22 .

At this time, UE20 will generate uplink data, so the identifier assigning unit 26 assigns information (identifier or label) indicating "also serving as a UL scheduling request" to the message #2-2 and then sends it (steps S13 and Step B24 of Fig. 14).

That is, when the UE 20 performs random access using the signature for acquiring (establishing) uplink synchronization when generating downlink data, it also transmits a UL scheduling request to the eNB 19 .

If the reception of the above message #2-2 (also UL scheduling request) is recognized in eNB10 (step A24 of FIG. 13 is YES branch), the radio resource management unit 16 implements the UL radio resource corresponding to the UL scheduling request. For distribution control (step A25 in FIG. 13 ), the signature management unit 15 generates a response message #2-3 to the above-mentioned message #2-2, and transmits it to the UE 20 (step S14 in FIG. 12 ). In addition, when the above UL synchronization request message #2-2 does not include a UL scheduling request (No in step A24 of FIG. Resource allocation is performed to transmit message #2-3 (step A26 in FIG. 13 ).

As mentioned above, according to the random access method of this example, when eNB10 generates downlink data destined for UE20 and eNB10 assigns a signature to UE20, if uplink data is generated at UE20, UE20 will not perform The contention-based random access signature is generated, but the signature allocated by the eNB 10 is used to continue the non-contention-based random access, so the above two random access steps will not be performed at the same time.

Therefore, the level of control of random access can be simplified, and effective use of signatures for random access can be realized. In addition, neither the UE20 nor the eNB10 needs to manage the above two signatures all the time.

Furthermore, when the above-mentioned non-contention-based random access is continued, since the information (UL scheduling acknowledgment) that should be sent to eNB10 in the process of contention-based random access is sent to eNB10, uplink data can be reliably executed together. Send processing and receive processing of downlink data.

In addition, since the random access preamble message #2-2 also serves as the UL scheduling request, compared to the fourth embodiment described later (the case where the response message to the random access response message #2-3 also serves as the UL scheduling request) , which can reduce the delay before the start of uplink data transmission.

[4] Fourth Embodiment

FIG. 15 is a sequence diagram illustrating the random access procedure according to the fourth embodiment of the present invention, FIG. 16 is a flowchart illustrating the operation of eNB 10 when the random access procedure according to the fourth embodiment is performed, and FIG. 17 is a flowchart illustrating the operation of the fourth embodiment. This is a flow chart of the operation of UE 20 when the random access procedure according to the embodiment is performed.

This embodiment is the same as the third embodiment, and a description will be given of a case where uplink data is generated in UE 20 in a state where an individual signature is assigned to UE 20 in advance.

That is, when the downlink data sent to UE20 arrives at eNB10 from the upper device (downlink data exists in buffer unit 13) (step A31 in FIG. The signature (individual signature) that should be used for random access (UL synchronization request) (step A32 in FIG. 16 ), and the individual signature is sent to The aforementioned destination UE20 (step S11 in FIG. 15 and step A33 in FIG. 16 ).

Upon receiving the aforementioned signature allocation message # 2 - 1 , the UE 20 stores and manages the individual signatures allocated as above through the signature management unit 24 (step B31 in FIG. 17 ).

Thereafter, if uplink data is generated in UE 20 and the uplink data is held in buffer unit 23 (step B32 in FIG. 17 ), UE 20 (signature management unit 24 ) will not perform a random signature as in the first and second embodiments. generated (step S12 in FIG. 15 and step B33 in FIG. 17 ).

Instead, UE20 generates UL synchronization request message #2-2 (random access preamble) including the individual signature assigned by eNB10 through access determination unit 25, and transmits it to eNB10 from antenna 21 via transceiver unit 22 (steps in FIG. 15 S13 and step B34 of Fig. 17).

In eNB10, if it recognizes the reception of the above message #2-2 (YES branch of step A34 in FIG. The management unit 15 generates a response message #2-3 to the above-mentioned message #2-2, and sends it to the UE 20 (step S14 in FIG. 15 ). And, when the reception of the above-mentioned message #2-2 (also serving as the UL scheduling request) cannot be recognized, the eNB 10 ends the process (No branch of step A34 in FIG. 16 ).

On the other hand, when UE20 receives the above-mentioned response message #2-3 from eNB10 (step S34 in FIG. 17 ), message determination unit 25 generates an acknowledgment (ACK/NACK) message #3 therefor and sends it to eNB10. At this time, the UE 20 assigns information (identifier or flag) indicating "also serves as a UL scheduling request" to the acknowledgment response message #3 through the identifier assigning unit 16, and transmits it (step B35 in FIG. 17 ). Also, it may not be sent simultaneously with the confirmation response message #3, but sent through a separate uplink message.

That is, when UE 20 performs random access using the signature used to obtain uplink synchronization when generating downlink data, it transmits a UL scheduling request to the eNB after the random access ends.

As mentioned above, according to the random access method of this example, when eNB10 generates downlink data destined for UE20 in eNB10 and eNB10 assigns a signature to UE20, if uplink data is generated in UE20, UE20 does not generate Instead of the signature used for contention-based random access, the signature allocated by the eNB 10 is used to continue non-contention-based random access, and the same effects or advantages as those of the third embodiment can be obtained.

In addition, in this example, since the acknowledgment response message #3 to the random access response message #2-3 also serves as a UL scheduling request, even if the acknowledgment response message #3 cannot be correctly received and recognized by the eNB 10 due to the propagation environment 3. At least the downlink data transmission can be started normally.

In addition, the uplink message serving as the UL scheduling request can be used as uplink data for reporting the CQI to the eNB10, for example.

[5] Fifth Embodiment

FIG. 18 is a sequence diagram illustrating a random access procedure according to the fifth embodiment of the present invention. This example is an example where the eNB 10 transmits a signature allocation message (random access preamble allocation) #2-1 after transmitting a response message (random access response) #1-2 to the UE 20 .

That is, when uplink data is generated in UE20, UE20 generates a random signature through signature management unit 24, and transmits random access preamble message (uplink transmission request) #1-1 including the random signature to eNB10 (step S1a).

If eNB10 receives the above-mentioned message #1-1, it will send the response message (random access response) #1-2 to the received above-mentioned uplink transmission request message #1-1 together with the synchronization signal and transmission permission for uplink communication Reply together (step S2). The response message #1-2 is returned to the plurality of UEs 20 when the plurality of UEs 20 transmit through the RACH at the same time.

At this stage, if the downlink data sent to UE20 arrives at eNB10 from the upper device, eNB10 generates an individual signature through signature management unit 15, and sends it to UE20 through signature assignment message (random access preamble assignment) #2-1 (step S2b) .

In UE20, if the above-mentioned signature allocation message (random access preamble allocation) #2-1 is received, the above-mentioned random signature and individual signature will exist, and multiplex allocation will be generated. If the UE20 detects the multiplexing allocation, it selects any one of the signatures in the same manner as in the first and second embodiments, and continues to perform a random access corresponding to the selected signature (the contention-based case of random access).

In this case, as in the first embodiment, the uplink message #1-3 transmitted in the subsequent step S3 can also be used as a UL synchronization confirmation. Also, as in the second embodiment, the uplink message #1-3 can also serve as the UL scheduling request, and the uplink message (random access preamble) #2-2 can also serve as the UL scheduling request. Furthermore, the UL scheduling request can be sent not only through the ACK/NACK signal for the response message #2-3, but also through a separate uplink message.

Then, if the eNB 10 recognizes a valid UE 20 by receiving the message #1-3, etc., it can release a signature in the multiplexing allocation state.

That is, according to the first embodiment and this example, the transmission timing of signature assignment message (random access preamble assignment) #2-1 to UE20 may be any timing before eNB10 receives message #1-3.

[6] Sixth Embodiment

FIG. 19 is a sequence diagram illustrating a random access procedure according to the sixth embodiment of the present invention. This example is an example in which eNB10 transmits a signature allocation message (random access preamble allocation) #2-1 to UE20 after UE20 transmits message (Scheduled Transmission) #1-3 to eNB10.

That is, if uplink data is generated in UE20, UE20 will send a random access preamble message (uplink transmission request) #1-1 containing a random signature to eNB10 (step S1a). After #1-2 (step S2), send message #1-3 (step S3).

Upon receiving the message #1-3, the eNB 10 starts a process of detecting a valid ID (terminal ID) of the UE 20 . If a valid terminal ID is detected, it can be identified which UE20 has a signature contention, and if a contention occurs, contention resolution messages (ContentionResolution: contention resolution) #1-4 are sent to the corresponding UE20 to resolve the contention (step S4).

Here, in the processing of this message #1-3, because the downlink data addressed to UE20 arrives at eNB10 from the higher-level equipment (there is downlink data in buffer unit 13), and the receiving process cannot be completed, the UE20 cannot be identified. Sent messages #1-3 above.

In this case, the eNB 10 generates and stores a signature (individual signature: second information) that should be used for random access (UL synchronization request) by the destination UE 20 of the above-mentioned downlink data through the signature management unit 15, and passes the signature assignment message (RAPreambleAssignment : random access preamble allocation) #2-1 transmits the individual signature to the above-mentioned destination UE 20 via the transmitting and receiving unit 12 (step S3a).

Upon completion of the sending and receiving process of these messages #1-3 and #2-1, the eNB 10 can identify "which UE 20 is using which signature". That is, it is possible to identify which UE 20 is issued two signatures (RandomPreamble and DedicatedPreamble: Random Preamble and Dedicated Preamble).

Here, when there is no contention between UE 20 and other UEs (hereinafter referred to as other UEs), it can be determined that multiplexing allocation has occurred to UE 20 , and therefore eNB 10 (signature management unit 15 ) immediately releases the allocation to UE 20 . For the individual signature of UE20, contention resolution message #1-4 is sent as usual (step S4). Since uplink synchronization can be normally ensured at this stage, downlink data transmission can be started.

On the other hand, when contention occurs between UE 20 and other UEs, there is a possibility that messages # 1 - 3 transmitted from UE 20 and other UEs may collide. In this case, since it cannot be determined at this stage that the multiplexing allocation has occurred to the UE 20 , the individual signature allocated to the UE 20 cannot be immediately released. When contention occurs, eNB10 notifies UE20 of contention occurrence in contention resolution message #1-4. At this time, it is preferable to keep the individual signatures until the signature-multiplexed UE 20 is detected.

In contrast, UE 20 can recognize (detect) the existence of the UE 20 regardless of whether eNB 10 has been notified of the terminal ID of own station 20 at the stage of ending transmission of message #1-3 and signature allocation message #2-1. Both the random signature (random preamble) generated by the station and the individual signature (DedicatedPreamble) assigned by the eNB10, that is, the generation of the above two random accesses.

At this time, when messages #1-3 transmitted from UE20 and other UEs do not collide in eNB10, UE20 can know that there is no contention by referring to contention resolution message #1-4 notified from eNB10. In this case, UE20, for example, releases a single preamble, and can ensure UL synchronization through a contention-based random access procedure. The reason for this is that the UL timing information has been correctly received through message #1-2.

On the other hand, when messages #1-3 transmitted from UE20 and other UEs collide in eNB10, UE20 can know that contention has occurred by referring to contention resolution message #1-4 notified from eNB10. In this case, the UE 20 releases the individual preamble, and simultaneously secures the UL synchronization request and the UL scheduling request through the contention-based random access procedure as in the first embodiment. In addition, as in the second to fourth embodiments, it is also possible to secure UL synchronization requests and UL scheduling requests by a non-contention based random access procedure.

Furthermore, as described in the first embodiment, each random access procedure can be performed simultaneously. That is, if it is detected that contention is generated, non-contention based random access may also be performed simultaneously using the individual signature notified by the above message #2-1.

In addition, in this embodiment, it is described that the above-mentioned message #2-1 is transmitted during the processing of the above-mentioned message #1-3, but even if it is transmitted between the above-mentioned message #1-2 and the above-mentioned message #1-3 In the case of the above-mentioned message #2-1, of course, the present embodiment can realize the same operation.

Industrial applicability

As described in detail above, according to the present invention, any one of a plurality of random accesses can be selectively performed, and in addition, effective utilization of resources such as signatures used in the above-mentioned random accesses can be realized, so it is considered to be an important aspect for wireless It is extremely useful in the field of communication technology.

Claims (16)

1. the accidental access method in wireless communication system, above-mentioned wireless communication system comprises base station and wireless terminal, and above-mentioned accidental access method comprises the steps:

In above-mentioned wireless terminal,

For employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from above-mentioned base station, when the new request of another Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out a Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process, only carry out the one in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process.

2. the accidental access method in wireless communication system, above-mentioned wireless communication system comprises base station and wireless terminal, and above-mentioned accidental access method comprises the steps:

In above-mentioned wireless terminal,

For employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from above-mentioned base station, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation.

3. the accidental access method in wireless communication system, above-mentioned wireless communication system comprises base station and wireless terminal, and above-mentioned accidental access method comprises the steps:

In above-mentioned wireless terminal,

For employing the 1st Stochastic accessing process of the 1st random access guiding received from above-mentioned base station and employing the 2nd Stochastic accessing process of the 2nd random access guiding, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation.

4. the accidental access method in wireless communication system, above-mentioned wireless communication system comprises base station and wireless terminal, and above-mentioned accidental access method comprises the steps:

In above-mentioned wireless terminal,

When the new request of another Stochastic accessing in above-mentioned 1st Stochastic accessing and above-mentioned 2nd Stochastic accessing is carried out in the request that to receive when carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, select the 1st information being used for above-mentioned 1st Stochastic accessing or the 2nd information for above-mentioned 2nd Stochastic accessing received from above-mentioned base station; Further,

Only carry out the Stochastic accessing employing selected information.

5. a wireless communication system, this wireless communication system comprises:

Base station; And

The wireless terminal that communicates is carried out with above-mentioned base station, wherein,

In above-mentioned wireless terminal, for employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from above-mentioned base station, when the new request of another Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out a Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process, only carry out the one in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process

Above-mentioned base station and above-mentioned wireless terminal carry out data communication.

6. a wireless communication system, this wireless communication system comprises:

Base station; And

The wireless terminal that communicates is carried out with above-mentioned base station, wherein,

In above-mentioned wireless terminal, for employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from above-mentioned base station, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation, and

Above-mentioned base station and above-mentioned wireless terminal carry out data communication.

7. a wireless communication system, this wireless communication system comprises:

Base station; And

The wireless terminal that communicates is carried out with above-mentioned base station, wherein,

In above-mentioned wireless terminal, for employing the 1st Stochastic accessing process of the 1st random access guiding received from above-mentioned base station and employing the 2nd Stochastic accessing process of the 2nd random access guiding, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation, and

Above-mentioned base station and above-mentioned wireless terminal carry out data communication.

8. a wireless communication system, this wireless communication system comprises:

Base station; And

The wireless terminal that communicates is carried out with above-mentioned base station, wherein,

In above-mentioned wireless terminal, when the new request of another Stochastic accessing in above-mentioned 1st Stochastic accessing and above-mentioned 2nd Stochastic accessing is carried out in the request that to receive when carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, select the 1st information being used for above-mentioned 1st Stochastic accessing or the 2nd information for above-mentioned 2nd Stochastic accessing received from above-mentioned base station, and only carry out the Stochastic accessing employing selected information, and

Above-mentioned base station and above-mentioned wireless terminal carry out data communication.

9. a wireless terminal, this wireless terminal comprises processing unit, this processing unit performs following process: for employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from base station, when the new request of another Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out a Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process, only carry out the one in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process.

10. a wireless terminal, this wireless terminal comprises processing unit, this processing unit performs following process: for employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from base station, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation.

11. 1 kinds of wireless terminals, this wireless terminal comprises processing unit, this processing unit performs following process: for employing the 1st Stochastic accessing process of the 1st random access guiding received from base station and employing the 2nd Stochastic accessing process of the 2nd random access guiding, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation.

12. 1 kinds of wireless terminals, this wireless terminal comprises:

Selected cell, it, when the new request of another Stochastic accessing in above-mentioned 1st Stochastic accessing and above-mentioned 2nd Stochastic accessing is carried out in the request that to receive when carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, selects the 1st information being used for above-mentioned 1st Stochastic accessing or the 2nd information for above-mentioned 2nd Stochastic accessing received from base station; And

Processing unit, it carries out the Stochastic accessing employing selected information.

13. 1 kinds of base stations, this base station comprises communication unit, this communication unit and wireless terminal carry out data communication, in above-mentioned wireless terminal, for employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from above-mentioned base station, when the new request of another Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out a Stochastic accessing process in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process, only carry out the one in above-mentioned 1st Stochastic accessing process and above-mentioned 2nd Stochastic accessing process.

14. 1 kinds of base stations, this base station comprises communication unit, this communication unit and wireless terminal carry out data communication, in above-mentioned wireless terminal, for employing the 1st Stochastic accessing process of the 1st random access guiding and employing the 2nd Stochastic accessing process of the 2nd random access guiding received from above-mentioned base station, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation.

15. 1 kinds of base stations, this base station comprises communication unit, this communication unit and wireless terminal carry out data communication, in above-mentioned wireless terminal, for employing the 1st Stochastic accessing process of the 1st random access guiding received from above-mentioned base station and employing the 2nd Stochastic accessing process of the 2nd random access guiding, when the new request of above-mentioned 2nd Stochastic accessing process is carried out in the request that to receive when carrying out above-mentioned 1st Stochastic accessing process, only perform the one proceeding above-mentioned 1st Stochastic accessing process and restart in above-mentioned 2nd Stochastic accessing process these two operation.

16. 1 kinds of base stations, this base station comprises communication unit, this communication unit and wireless terminal carry out data communication, in above-mentioned wireless terminal, when the new request of another Stochastic accessing in above-mentioned 1st Stochastic accessing and above-mentioned 2nd Stochastic accessing is carried out in the request that to receive when carrying out a Stochastic accessing in the 1st Stochastic accessing and the 2nd Stochastic accessing, select the 1st information being used for above-mentioned 1st Stochastic accessing or the 2nd information for above-mentioned 2nd Stochastic accessing received from above-mentioned base station, and above-mentioned wireless terminal only carries out the Stochastic accessing employing selected information.