AU2018201610B2 - Radio communication apparatus, radio communication system, and radio communication method - Google Patents

Radio communication apparatus, radio communication system, and radio communication method Download PDF

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Publication number
AU2018201610B2
AU2018201610B2 AU2018201610A AU2018201610A AU2018201610B2 AU 2018201610 B2 AU2018201610 B2 AU 2018201610B2 AU 2018201610 A AU2018201610 A AU 2018201610A AU 2018201610 A AU2018201610 A AU 2018201610A AU 2018201610 B2 AU2018201610 B2 AU 2018201610B2
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Prior art keywords
radio communication
frequency band
communication apparatus
mobile station
base station
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AU2018201610A
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AU2018201610A1 (en
Inventor
Yoshihiro Kawasaki
Yoshiaki Ohta
Yoshinori Tanaka
Tetsuya Yano
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Fujitsu Ltd
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Fujitsu Ltd
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Priority claimed from AU2015203078A external-priority patent/AU2015203078B2/en
Priority claimed from AU2016200035A external-priority patent/AU2016200035B2/en
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Priority to AU2018201610A priority Critical patent/AU2018201610B2/en
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Abstract

RADIO COMMUNICATION APPARATUS, RADIO COMMUNICATION SYSTEM, AND RADIO COMMUNICATION METHOD Disclosed is a radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of frequency bands. In one aspect, the radio communication apparatus comprises: a receiver configured to receive, when performing a random access procedure to the another radio communication apparatus, a control message by using a first frequency band as a message transmitted by the radio communication apparatus at a last of the random access procedure, the control message instructing communication using a second frequency band different from the first frequency band; and a controller configured to control communication according to reception of the control message, to perform data communication with the another radio communication apparatus by using the second frequency band.

Description

RADIO COMMUNICATION APPARATUS, RADIO COMMUNICATION SYSTEM, AND RADIO COMMUNICATION METHOD
The present application is a divisional application of Australian Patent Application No. 2016250481, filed on 28 October 2016, which is a divisional of Australian Patent Application No. 2016200035, filed on 5 January 2016, which is a divisional application of Australian Patent Application No. 2015203078, filed on 10 June 2015, which is a divisional application of Australian Patent Application No. 2010345902, filed on 12 February 2010. The contents of each of Australian Patent Application Nos. 2016250481, 2016200035, 2015203078 and 2010345902 are incorporated herein by reference as if expressly set forth.
Technical Field
At least one embodiment discussed herein is related to a radio communication apparatus, a radio communication system, and a radio communication method.
Background
A plurality of radio communication systems such as a cell-phone system and a radio MAN (Metropolitan Area Network) are currently used. For attaining a further speeding up and large capacity of radio communication, lively discussion is continuously performed about a next generation radio communication technology.
For example, in a 3GPP (3rd Generation Partnership
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Project) being a standardization organization, there is proposed a communication standard referred to as an LTE (Long Term Evolution) enabling communication using a frequency band of 20 MHz at a maximum. Further, as a next 5 generation communication standard of LTE, there is proposed a communication standard referred to as an LTE-A (LTE-Advanced) enabling communication using five frequency bands (namely, a frequency band of 100 MHz) of 20 MHz at a maximum (see, for example, Non-Patent Literatures 1 and 2).
In the LTE-A, the number of frequency bands to be used is proposed to be dynamically changed according to traffic (see, for example, Non-Patent Literature 3).
Further, in a radio communication system, from one radio communication device (e.g., a mobile station) to 15 another radio communication device (e.g., a base station) which performs allocation control of radio resources, a random access may be performed. The random access from the mobile station to the base station is performed, for example, at the time when (1) the mobile station first 20 accesses the base station, (2) an allocation of radio resources used for data transmission is requested to the base station, and (3) synchronization is established during reception of data from the base station, and (4) synchronization is achieved with a mobile target base 25 station during a handover.
The random access includes a contention based random access and a non-contention based random access
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2018201610 06 Mar 2018 (see, for example, 10. 1. 5 section of Non-Patent
Literature 4, and 5. 1 section of Non-Patent Literature 5). In the case of the random access from the mobile station to the base station, in the contention based random access, the mobile station arbitrarily selects a signal sequence from among a plurality of signal sequences and transmits it to the base station as a random access preamble. In the non-contention based random access, the base station notifies the mobile station of information in which a signal sequence is specified and the mobile station transmits a signal sequence according to the notification from the base station as the random access preamble.
Citation List
Patent Literature
NPTL1: 3GPP (3rd Generation Partnership Project), Requirements for further advancements for Evolved Universal Terrestrial Radio Access (E-UTRA) (LTEAdvanced), 3GPP TR 36.913 V8.0.1, 2009-03.
NPTL2: 3GPP (3rd Generation Partnership Project),
Feasibility study for Further Advancements for E-UTRA (LTE-Advanced), 3GPP TR 36.912 V9.0.0, 2009-09.
NPTL3: 3GPP (3rd Generation Partnership Project),
The need for additional activation procedure in carrier aggregation, 3GPP TSG-RAN WG2 #67bis R2-095874, 2009-10.
NPTL4: 3GPP (3rd Generation Partnership Project),
Evolved Universal Terrestrial Radio Access (E-UTRA) and
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Evolved Universal Terrestrial Radio Access Network (EUTRAN); Overall description, 3GPP TS 36.300 V9.0.0, 200906.
NPTL5: 3GPP (3rd Generation Partnership Project),
Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification, 3GPP TS 36.321 V9.1.0, 2009-12.
Incidentally, in a radio communication system capable of performing communication by using a plurality 10 of frequency bands, the number of frequency bands to be used according to traffic as described above is considered to be changed. However, in a method as described in the Non-Patent Literature 3, after communication is started between radio communication devices (after completing a 15 random access procedure), a procedure is freshly performed so as to use other frequency bands except the frequency band in which communication is started. In this method, in the case where it is proved that the other frequency bands are desired to be used before starting communication (for 20 example, in the case where a transmission data amount is proved to be large), the procedure becomes inefficient.
In view of the foregoing, a need exists to provide a radio communication apparatus, a radio communication system, and a radio communication method that seek to 25 perform the use control of a plurality of frequency bands.
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Summary
It is an object of the present invention to substantially overcome or at least ameliorate one or more disadvantages of the existing arrangements.
In one aspect, there is provided a radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of pairs of a downlink frequency band and an uplink frequency band. The apparatus comprises: a receiving unit 10 configured to receive a control message by using a downlink frequency band of a first pair among downlink frequency bands of the pairs during a random access procedure to said another radio communication apparatus, the control message including identification information 15 indicating use of an uplink frequency band of a second pair different from the first pair, the downlink frequency band of the first pair being monitored for control messages by the radio communication apparatus; and a control unit configured to control the radio communication 20 apparatus to perform data communication with said another radio communication apparatus by using the uplink frequency band of the second pair indicated by the identification information included in the control message.
In another aspect, there is provided a radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of pairs of a downlink frequency band and an uplink
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2018201610 06 Mar 2018 frequency band. The apparatus comprises: a control unit configured to, when said another radio communication apparatus monitors control messages by using a downlink frequency band of a first pair among downlink frequency 5 bands of the pairs, select an uplink frequency band of a second pair different from the first pair as an uplink frequency band to be used in data communication with said another radio communication apparatus; and a transmitting unit configured to transmit a control message to said another radio communication apparatus by using the downlink frequency band of the first pair during a random access procedure, the control message including identification information indicating use of the uplink frequency band of the second pair.
In another aspect, there is provided a radio communication system to perform communication by using a plurality of pairs of a downlink frequency band and an uplink frequency band. The system comprises: a first radio communication apparatus configured to transmit a control 20 message by using a downlink frequency band of a first pair among downlink frequency bands of the pairs during a random access procedure, the control message including identification information indicating use of an uplink frequency band of a second pair different from the first 25 pair, the downlink frequency band of the first pair being monitored for control messages by a communicating peer; and a second radio communication apparatus configured to receive the control message from the first radio communication apparatus by using the downlink frequency
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2018201610 06 Mar 2018 band of the first using the uplink indicated by the pair, and perform data communication by frequency band of the second pair identification information included in the control message.
In another aspect, there is provided a radio communication method for use in a system including first and second apparatuses to perform communication of pairs of a downlink frequency band. The method first radio communication the second radio downlink frequency frequency bands of access procedure frequency comprises :
apparatus, radio communication radio communication by using a plurality band and an uplink transmitting, by the a control message to communication apparatus by band of a first pair among the by apparatus, the control using a downlink pairs when the second message information indicating use of an a second pair different frequency band of the control messages by from the performing a random radio communication including identification uplink frequency band of first pair, the downlink first pair the second apparatus; receiving, by the second being radio radio apparatus, the control message from the monitored for communication communication first radio communication apparatus by using the downlink frequency band of the first pair; and performing, by the second radio communication apparatus, data communication by using the uplink frequency band of the second pair indicated by the identification information included in the control message .
According to aspects of the radio communication
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2018201610 06 Mar 2018 apparatus, radio communication system, and radio communication method, use control of a plurality of frequency bands is effectively performed.
According to another aspect, there is provided a radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of frequency bands, the radio communication apparatus comprising: a receiver configured to receive, when performing a random access procedure to said another radio communication apparatus, a control message by using a first frequency band as a response to a preamble message transmitted by the radio communication apparatus, the control message instructing communication using a second frequency band different from the first frequency band;
and a controller configured to perform, when the control message corresponds to the preamble message, data communication with said another radio communication apparatus by using the second frequency band.
According to another aspect, there is provided a radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of frequency bands, the radio communication apparatus comprising: a controller configured to select a second frequency band different from a first frequency band, as a frequency band to be used for data communication by said another radio communication apparatus; and a transmitter configured to transmit a control message to said another
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2018201610 06 Mar 2018 radio communication apparatus by using the first frequency band as a response to a preamble message received from said another radio communication apparatus when a random access procedure is performed, the control message 5 instructing communication using the second frequency band selected by the controller.
According to another aspect, there is provided a radio communication system to perform communication by using a plurality of frequency bands, the radio communication system comprising: a first radio communication apparatus configured to transmit a control message by using a first frequency band as a response to a preamble message received by the first radio communication apparatus when a random access procedure is performed, the control message 15 instructing communication using a second frequency band different from the first frequency; and a second radio communication apparatus configured to receive the control message from the first radio communication apparatus by using the first frequency band, and when the control 20 message corresponds to the preamble message transmitted by the second radio communication apparatus, perform data communication by using the second frequency band.
According to another aspect, there is provided a radio communication method for use in a radio communication 25 system including first and second radio communication apparatuses to perform communication by using a plurality of frequency bands, the radio communication method
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2018201610 31 Jan 2019 comprising: transmitting, by the first radio communication apparatus, a control message to the second radio communication apparatus by using a first frequency band as a response to a preamble message received from the second radio communication apparatus when a random access procedure is performed by the second radio communication apparatus, the control message instructing communication using a second frequency band different from the first frequency band; receiving, by the second radio communication apparatus, the control message from the first radio communication apparatus by using the first frequency band; and performing, by the second radio communication apparatus, data communication by using the second frequency band when the control message corresponds to the preamble message.
In another aspect, the present invention provides a radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of frequency bands, the radio communication apparatus comprising: a receiver configured to receive, when performing a random access procedure to the another radio communication apparatus, a control message by using a first frequency band as a last message among a plurality of messages transmitted by the radio communication apparatus in the random access procedure, the control message instructing communication using a second frequency band different from the first frequency band; and a controller configured to control communication according to reception of the control message, to perform data communication with the another radio communication apparatus by using the second frequency band.
In another aspect, the present invention provides a radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of frequency bands, the radio communication apparatus comprising: a controller configured to select a second frequency band different from a first frequency band, as a frequency band to be used for data communication by the another radio communication apparatus; and a transmitter configured to transmit a control message to the another radio communication apparatus by using the first frequency band as a last message among a plurality of messages transmitted in a random access procedure when the random access procedure is performed, the control message instructing communication using the second frequency band selected by the controller.
In another aspect, the present invention provides a radio communication system to perform communication by using a plurality of frequency bands, the radio communication system comprising: a first radio communication apparatus configured to transmit a control message by
21964609 (IRN: P038247D4)
10a
2018201610 31 Jan 2019 using a first frequency band as a last message among a plurality of messages transmitted in a random access procedure when the random access procedure is performed, the control message instructing communication using a second frequency band different from the first frequency; and a second radio communication apparatus configured to receive the control message from the first radio communication apparatus by using the first frequency band, and perform, according to reception of the control message, data communication by using the second frequency band.
In another aspect there is provided a radio communication method for use in a radio communication system including first and second radio communication apparatuses to perform communication by using a plurality of frequency bands, the radio communication method comprising: transmitting, by the first radio communication apparatus, a control message to the second radio communication apparatus by using a first frequency band as a last message among a plurality of messages transmitted in a random access procedure when the random access procedure is performed by the second radio communication apparatus, the control message instructing communication using a second frequency band different from the first frequency band; receiving, by the second radio communication apparatus, the control message from the first radio communication apparatus by using the first frequency band; and performing, by the second radio communication apparatus, data communication by using the second frequency band according to reception of the control message
The above-mentioned and other features and advantages of aspects of this invention will become apparent from the following detailed description of at least one preferred embodiment of the invention, taken in conjunction with the accompanying drawings.
Brief Description of Drawings [FIG. 1] FIG 1 illustrates a radio communication system according to a first embodiment.
[FIG 2] FIG 2 illustrates a mobile communication system according to a second embodiment.
[FIG 3] FIG 3 is a sequence diagram illustrating
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2018201610 06 Mar 2018 a contention based random access procedure.
[FIG. 4] FIG. 4 is a sequence diagram illustrating a non-contention based random access procedure.
[FIG. 5] FIG. 5 illustrates a component carrier in 5 which radio communication is performed.
[FIG. 6] FIG. 6 is a block diagram illustrating a base station.
[FIG. 7] FIG. 7 is a block diagram illustrating a mobile station.
[FIG. 8] FIG. 8 is a flowchart illustrating a process of a base station according to a second embodiment.
[FIG. 9] FIG. 9 is a flowchart illustrating a process of a mobile station according to a second embodiment.
15 [FIG. 10] FIG. 10 illustrates a first random
access example according to a second embodiment.
[FIG. 11] FIG. 11 illustrates a second random
access example according to a second embodiment.
[FIG. 12] FIG. 12 illustrates a third random
20 access example according to a second embodiment.
[FIG. 13] FIG. 13 illustrates a first format
example of a MsgO.
[FIG. 14] FIG. 14 illustrates a second format
example of a MsgO.
25 [FIG. 15] FIG. 15 illustrates a third format
example of a MsgO.
[FIG. 16] FIG. 16 illustrates a first size
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[FIG. 17] FIG. 17 illustrates a second size adjustment example of a MsgO.
[FIG. 18] FIG. 18 illustrates a third size adjustment example of a MsgO.
[FIG. 19] FIG. 19 is a flowchart illustrating a process of a base station according to a third embodiment.
[FIG. 20] FIG. 20 is a flowchart illustrating a
process of a mobile station according to a third
10 embodiment.
[FIG. 21] FIG. 21 illustrates a first random
access example according to a third embodiment.
[FIG. 22] FIG. 22 illustrates a second random
access example according to a third embodiment.
15 [FIG. 23] FIG. 23 illustrates a third random
access example according to a third embodiment.
[FIG. 24] FIG. 24 illustrates a first format
example of a Msg2.
[FIG. 25] FIG. 25 illustrates a second format
20 example of a Msg2.
[FIG. 26] FIG. 26 illustrates a third format
example of a Msg2.
[FIG . 27] FIG. 27 is a flowchart illustrating a
process of a base station according to a fourth embodiment
25 [FIG . 28] FIG. 28 is a flowchart illustrating a
process of a mobile station according to a fourth
embodiment.
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[FIG. 29] FIG. 29 illustrates a first random
access example according to a fourth embodiment.
[FIG. 30] FIG. 30 illustrates a second random
access example according to a fourth embodiment.
5 [FIG. 31] FIG. 31 illustrates a third random
access example according to a fourth embodiment.
Detailed Description
Preferred embodiments of the present invention will now be described in detail below with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout.
First Embodiment
FIG. 1 illustrates a radio communication system according to a first embodiment. The radio communication system according to the first embodiment includes radio communication apparatus 1 and
2. The radio communication apparatus and 2 perform communication by using a plurality of frequency bands.
Such a radio communication system is implemented, for example, as an LTE-A system. In the LTE-A system, the plurality of frequency bands may be each referred to as a CC (Component
The radio communication apparatus performs allocation control of radio resources. Under of the radio communication apparatus
1, the control the radio communication apparatus 2 performs data communication between the radio communication apparatus (or, another
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example, the radio implemented as a base radio communication subscriber station.
For communication apparatus station or a relay station, and apparatus 2 is implemented
Or, alternatively, the is the as a radio communication apparatus may be implemented as base station, and the implemented apparatus 1 apparatus or unit la sets a random
The and as a and radio relay may communication station. The be a fixed apparatus 2 may be radio communication radio communication a mobile radio communication apparatus.
radio communication apparatus a transmitting unit lb. The frequency band #1 as a frequency has a control control unit la band used for a access procedure through the radio communication apparatus 2.
The control unit la further selects a frequency band #2 as a frequency band used for data communication through the radio communication apparatus 2.
The transmitting unit lb transmits a control message relating to the random access to the radio communication apparatus 2 by using the frequency band #1.
Into this control message, identification information indicating the frequency band #2 is inserted.
The identification unique number) is previously matched with the plurality of the frequency bands, respectively.
The radio communication apparatus 2 has a receiving unit 2a and a control unit 2b. The receiving unit 2a receives the control message relating to the
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identification information communication apparatus 1 by
The control unit 2b confirms included in the received control message and controls the radio communication apparatus 2 to perform data communication by using the frequency band #2 indicated by the identification information. Examples of the random access target and data communication partner of the radio communication apparatus 1 include the radio communication apparatus 1. Note that in the case of performing a handover from the radio communication apparatus 1 to another radio communication apparatus, the random access target and data communication partner is a radio communication apparatus as a handover target.
As described above, as the random access, the radio communication apparatus 2 performs the noncontention based random access or contention based random
access . In the case of the non-contention based random
access, for example, a message (MsgO) for specifying a
20 signal sequence of a random access preamble or a random
access response (Msg2) as a response for the random access
preamble (Msgl) is considered to be used as the control message. In the case of the contention based random access, the random access response is considered to be used as the control message.
When receiving the control message including the identification information by using the frequency band #1,
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2018201610 06 Mar 2018 the radio communication apparatus 2 may continue a subsequent random access procedure by using the frequency band #2. In the case where the frequency band #2 is in a de-active state, at message including radio communication the time when receiving the control the identification information, the apparatus 2 may change a state of the frequency band #2 into an active at the time when receiving the the identification information, apparatus 1 may change a into an active state.
communication apparatus transmit and receive the state
In and state. On the other hand, control message including the radio communication of the frequency band #2 this case, the radio control need not message for separately changing a state of the frequency band #2 into an active state.
In the above-described radio communication system according to apparatus 1 band used the first embodiment, the radio communication selects the frequency band #2 as a frequency for data communication through the radio communication apparatus 2. At the time of performing the random access procedure, by using the frequency band #1, the radio communication apparatus 1 transmits the control message including the identification information indicating the frequency band #2 to the radio communication apparatus 2. On the other hand, at the time of performing the random access procedure, by using the frequency band #1, the radio communication apparatus 2 receives the control message including the identification
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2018201610 06 Mar 2018 information indicating the frequency band #2 from the radio communication apparatus 1. The radio communication apparatus 1 then performs data communication by using the
frequency band #2 indicated by the identification
5 information.
This process permits the radio communication
apparatus 1 to give a permission of the use of the
frequency band #2 different from the frequency band #1 used at the time of starting the random access procedure 10 to the radio communication apparatus 2 during the random access procedure. That is, the radio communication apparatus 1 implements cross carrier scheduling during the random access procedure. Accordingly, after the random access procedure, the radio communication apparatus 1 need 15 not separately perform a procedure for giving a permission of the use of the frequency band #2 to the radio communication apparatus 2, and effectively performs the use control of the plurality of the frequency bands.
In the second to fourth embodiments, a case where the radio communication method according to the first embodiment is applied to a mobile communication system of the LTE-A will be further described in detail below. Note that the radio communication method according to the first embodiment is applicable to the mobile communication 25 system using a communication method other than the LTE-A or the fixed radio communication system.
Second Embodiment
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FIG. 2 illustrates a mobile communication system according to a second embodiment. The mobile communication system according to the second embodiment includes a base station 10, a mobile station 20, and a relay station 30.
This mobile communication system allows radio communication using five component carriers at a maximum.
The base station 10 is a radio communication apparatus which performs communication directly with the mobile station 20 or via the relay station 30. The base station 10 is connected to a host station (not illustrated) by wire, and transfers user data between a wired section and a radio section.
The base station 10 manages radio resources of a link between the base station and the mobile station 20, and further radio resources of a link between the base station 10 and the relay station 30.
The mobile station 20 is a radio terminal device which accesses the base station 10 or the relay station 30 and performs radio communication. As the mobile station 20, for example, a mobile phone handset device or portable information terminal device is used. The mobile station 20 performs random access and establishes synchronization to the base station 10 or the relay station 30, and then transmits and receives data.
The relay station 30 is a radio communication device which relays data transmission between the base station 10 and the mobile station 20. The relay station 30
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2018201610 06 Mar 2018 may be a fixed communication device or a mobile communication device. The relay station 30 may perform random access to the base station 10 and establish synchronization therewith. In addition, the relay station 5 30 manages radio resources of a link between the relay station 30 and the mobile station 20.
In the following description of the second embodiment, the random access procedure performed between the base station 10 and the mobile station 20 will be described. Even between the base station 10 and the relay station 30 as well as between the relay station 30 and the mobile station 20, the same random access procedure is performed.
FIG. 3 is a sequence diagram illustrating the contention based random access procedure. The following section will now discuss the case where the random access procedure is performed in only one component carrier. The sequence illustrated in FIG. 3 includes the following steps :
(Step Sil) When data to be transmitted in an UL (uplink) is generated, the mobile station 20 selects one arbitrary signal sequence from among a plurality of previously defined signal sequences. The mobile station 20 then transmits a random access preamble (Msgl) including 25 the selected signal sequence to the base station 10 by using a PRACH (Physical Random Access Channel). At this time, on the PRACH, a plurality of the mobile stations may
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2018201610 06 Mar 2018 transmit the Msgl of the same signal sequence, namely, contention of the random access may be caused.
(Step S12) When detecting the Msgl on the PRACH, the base station 10 measures UL transmission timing of the mobile station 20, and at the same time allocates a UL radio resource to the mobile station 20. The base station then transmits the random access response (Msg2) including information for synchronizing the UL timing or information indicating the allocated UL radio resource. In the case where the contention of the random access is caused, the mobile stations which transmit the Msgl receive the Msg2, respectively.
(Step S13) When receiving the Msg2, the mobile station 20 transmits a scheduled transmission (Msg3) including the identification information of the mobile station 20 to the base station 10 by using the UL radio resource allocated by the base station 10. In the case where the contention of the random access is caused, the mobile stations which transmit the Msgl (namely, receive the Msg2) transmit an Msg3, respectively. In this case, a plurality of the transmitted Msg3 sets interfere with each other on the same radio resource.
(Step S14) The base station 10 detects the Msg3 on the UL radio resource allocated at step S12. Based on the 25 identification information included in the Msg3, the base station 10 recognizes the mobile station 20 which performs the random access. As a result, the base station 10
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2018201610 06 Mar 2018 transmits a contention resolution (Msg4) indicating that the mobile station 20 is recognized to the mobile station 20. The mobile station 20 then establishes synchronization between the base station 10 and its own station, and 5 allows the data communication.
Note that in the case where the contention of the random access is caused, the identification information of the mobile station as a transmission source fails to be extracted from the Msg3. In this case, the base station 10 10 transmits a message indicating that the contention of the random access is caused. After waiting for only the random time, the mobile station 20 which receives the message returns to step Sil and performs the random access procedure again. When the contention is eliminated, the 15 mobile station 20 establishes synchronization between the base station 10 and its own station, and allows the data communication .
FIG. 4 is a sequence diagram illustrating the noncontention based random access procedure. The following 20 section will now discuss the case where the random access procedure is performed in only one component carrier. The sequence illustrated in FIG. 4 includes the following steps :
(Step S21) When data transmitted in the downlink 25 (DL) reaches the base station 10, the base station 10 selects one unused signal sequence from among a plurality of the previously defined signal sequences. The base
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2018201610 06 Mar 2018 station 10 then transmits the dedicated preamble notification (MsgO) for specifying the selected signal sequence to the mobile station 20. At this time, the base station 10 performs exclusion control to a plurality of 5 mobile stations so as not to allocate the same signal sequence at the same time.
(Step S22) Within the specified period (period of validity) from receiving the MsgO, the mobile station 20 transmits the Msgl including the signal sequence specified 10 by the MsgO to the base station 10 by using the PRACH.
Here, since the specified signal sequence is exclusively allocated to the mobile stations 20 within the period of validity, the contention of the random access is not caused.
(Step S23) When detecting the Msgl on the PRACH, the base station 10 allocates the UL radio resource to the mobile stations 20. The base station 10 then transmits the Msg2 including information indicating the allocated UL radio resource to the mobile station 20. The data communication is then enabled between the base station 10 and the mobile station 20. Since the contention of the random access is not caused, the base station 10 need not transmit and receive the Msg3 and the Msg4 in the noncontention based random access.
The contention based random access is performed, for example, at the time when (1) the mobile station 20 first accesses the base station 10, and at the time when
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2018201610 06 Mar 2018 (2) the mobile station 20 requests the allocation of radio resources to the base station 10. The non-contention based random access is performed, for example, (3) when receiving data from the base station 10, at the time when 5 the mobile station 20 establishes synchronization with the base station 10, and (4) when performing handover to the base station 10 from another base station, at the time when the mobile station 20 establishes synchronization with the base station 10.
Note that when the non-contention based random access is to be performed (for example, at the time of establishing synchronization during the handover or when the mobile station 20 receives data from the base station 10) in the case where the separately allocated signal sequence is exhausted in the base station 10, the MsgO not including a dedicated preamble is transmitted and received.
In this case, the contention based random access is performed. In the case of the handover, the base station 10 before the handover transmits the MsgO to the mobile station 20. According to the second embodiment, the base station 10 and the mobile station 20 are supposed to perform the non-contention based random access procedure.
FIG. 5 illustrates a component carrier in which the radio communication is performed. As described above, the base station 10 and the mobile station 20 use five component carriers (CC#1 to #5) at a maximum, thereby performing radio communication. All bandwidths of the CC#1
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2018201610 06 Mar 2018 to #5 may be the same as each other or different from each other .
To the CC#1 to #5, a CI (Carrier Indicator) of 3 bits is given as identification information, respectively.
Here, ObOOO (0) indicates the CC#1, ObOOl (1) indicates the CC#2, ObOlO (2) indicates the CC#3, ObOll (3) indicates the CC#4, and OblOO (4) indicates the CC#5. Here, OblOl (5) and ObllO (6) are unused values (reservation values) . As described later, Oblll (7) may be used for 10 indicating its own component carrier.
The base station 10 sets their states of the CC#1 to #5 in each mobile station. Based on the states of the CC#1 to #5, the mobile station 20 controls radio reception processing of each component carrier. Based on their 15 states, for example, the CC#1 to #5 are classified into Configured but Deactivated CC, Configured and Activated CC, and PDCCH monitoring set.
The Configured but Deactivated CC is a component carrier in which the data communication is not currently 20 performed and which is in a usable state (de-active state). In the component carrier in a de-active state, the mobile station 20 need not monitor any of a PDCCH (Physical Downlink Control CHannel) in which control data is transmitted and a PDSCH (Physical Downlink Shared CHannel) 25 in which a data signal is transmitted. Namely, the mobile station 20 may stop the radio reception processing of the frequency band.
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The Configured and Activated CC is a component (in an active state) in which the data communication is component carrier currently performed.
in an active state
By using the the mobile station
20 performs at least radio reception processing relating to the PDSCH to the mobile station 20.
The PDCCH monitoring set is in an active state and a set of the component carriers in which the PDCCH to the mobile station 20 may be set. The mobile station 20 10 monitors the PDCCH by using the component carriers included in this set. In the case where a signal length of the PDCCH is not constant, the mobile station 20 blinddecodes the PDCCH. Specifically, the mobile station 20 tries a plurality of decodes according to a length of 15 available signal, thus extracting control data. Note that the PDCCH monitoring set is defined as a subset of the Configured and Activated CC and the reception processing of the PDCCH ought to be performed by all of the Configured and Activated CCs in some cases. In this case, 20 the PDCCH monitoring set and the Configured and Activated CC mean the same set.
In addition, a component carrier in which the PDCCH is set may be different in each mobile station. The base station 10 may set a part of the CC#1 to #5 as an ACC 25 (Anchor-Component Carrier) . The ACC is a component carrier to be monitored by the mobile station. In the case where the ACC is set, the ACC is included at least in the PDCCH
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2018201610 06 Mar 2018 monitoring set. A component carrier set as the ACC may be specified in each cell, or in each mobile station.
For performing two-way communication, the base station 10 and the mobile station 20 may use TDD (Time
Division Duplex) or FDD (Frequency Division Duplex). In the case where the TDD is used, one frequency band is set for each CC. In the case where the FDD is used, a pair of a frequency band for UL and a frequency band for DL is set for each CC. With regard to the after-mentioned random access procedure, any of the case where a frequency band is divided into the frequency band for UL and the frequency band for DL and the case where a frequency band is not divided into the frequency band for UL and the frequency band for DL may be performed.
FIG. 6 is a block diagram illustrating the base station. The base station 10 has a radio communication unit 11, a scheduler 12, a wired communication unit 13, a control unit 14, a control plane unit 15, a PDCCH control unit 16, a data plane unit 17, and an RAR control unit 18.
The radio communication unit 11 is a radio interface which performs radio communication with the mobile station 20 and the relay station 30. The radio communication unit 11 subjects a radio signal received from the mobile station 20 or the relay station 30 to signal processing including demodulation and decoding, and extracts user data and control data. In addition, the radio communication unit 11 subjects user data and control
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2018201610 06 Mar 2018 data to be transmitted to the mobile station 20 or the relay station 30 to signal processing including modulation and coding for radio transmission.
According to the instruction from the control unit
14, the scheduler 12 performs the allocation (scheduling) of radio resources to the mobile station 20 and the relay station 30. During the random access procedure, for example, the scheduler 12 allocates the UL radio resource to the mobile station 20, and notifies the radio 10 communication unit 11 of the allocated UL radio resource.
The wired communication unit 13 is a communication interface which performs wired communication with a host station. The wired communication unit 13 receives user data to the mobile station 20 from the host station. Under the scheduling through the scheduler 12, the received user data is transferred to the mobile station
0. The wired communication unit 13 further transfers the user data extracted by the radio communication unit to the host station .
The control unit 14 controls processes of the radio communication unit 11, the scheduler 12, and the wired communication unit 13. Within the control unit 14, the control plane unit 15 and the data plane unit 17 are provided. Within the control plane unit 15, the PDCCH control unit 16 is provided. Within the data plane unit 17, the RAR control unit 18 is provided.
The control plane unit 15 controls transmission
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2018201610 06 Mar 2018 and reception of control data between the mobile station 20, the relay station 30, and its own station. Specifically, the control plane unit 15 acquires the control data extracted by the radio communication unit 11 5 and performs communication control according to the control data. The control plane unit 15 further notifies the radio communication unit 11 of the control data to be transmitted to the mobile station 20 or the relay station 30. For example, the control plane unit 15 performs a 10 process of an RRC (Radio Resource Control Protocol).
The PDCCH control unit 16 controls PDCCH signaling during the random access procedure. Specifically, the PDCCH control unit 16 determines what information is included in the dedicated preamble notification (MsgO) to 15 be transmitted to the mobile station 20 or the relay station 30 by using the PDCCH. For example, the PDCCH control unit 16 may insert into the MsgO a CI of the component carrier in which the data communication is performed.
The data plane unit 17 controls transmission and
reception of the user data between the mobile station 20,
the relay station 30, and its own station. For example,
the data plane unit 17 performs processes of a PDCP
(Packet Data Convergence Protocol) , an RLC (Radio Link
Control) protocol, and e i MAC (Media Access Control)
protocol.
The RAR control unit 18 controls MAC signaling
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2018201610 06 Mar 2018 during the random access procedure. Specifically, the RAR control unit 18 determines what information is included in the random access response (Msg2) to be transmitted to the mobile station 20 or the relay station 30 by using the 5 PDSCH. For example, the RAR control unit 18 may insert into the Msg2 a CI of the component carrier in which the data communication is performed.
FIG. 7 is a block diagram illustrating the mobile station. The mobile station 20 has a radio communication unit 21, a cross carrier setting unit 22, a control unit
23, a control plane unit 24, a PDCCH control unit 25, a data plane unit 26, and an RAR control unit 27.
The radio communication unit 21 is a radio interface which performs radio communication with the base station 10 and the relay station 30. The radio communication unit 21 subjects a radio signal received from the base station 10 or the relay station 30 to signal processing including demodulation and decoding, and extracts user data and control data. In addition, the radio communication unit 21 subjects user data and control data to be transmitted to the base station 10 or the relay station 30 to signal processing including modulation and coding for radio transmission.
According to the instruction from the control unit
23, the cross carrier setting unit 22 performs setting of a frequency band (component carrier) in which the radio communication unit 21 performs signal processing during
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2018201610 06 Mar 2018 the random access procedure. In the case where a CI is included in the received MsgO or Msg2, for example, the cross carrier setting unit 22 then sets the frequency band so as to perform the data communication by using the component carrier indicated by the CI. In the second embodiment, the CI is supposed to be inserted into the MsgO .
The control unit 23 controls processes of the radio communication unit 21 and the cross carrier setting unit 22. Within the control unit 23, the control plane unit 24 and the data plane unit 26 are provided. Within the control plane unit 24, the PDCCH control unit 25 is provided. Within the data plane unit 26, the RAR control unit 27 is provided.
The control plane unit 24 controls transmission and reception of control data between the base station 10, the relay station 30, and its own station. Specifically, the control plane unit 24 acquires the control data extracted by the radio communication unit 21 and performs communication control according to the control data. The control plane unit 24 further notifies the radio communication unit 21 of the control data to be transmitted to the base station 10 or the relay station 30. For example, the control plane unit 24 performs a process of an RRC.
The PDCCH control unit 25 controls PDCCH signaling during the random access procedure. Specifically, the
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PDCCH control unit 25 analyzes the MsgO to be received through the PDCCH from the base station 10 or the relay station 30, and performs a process based on the information included in the MsgO. In the case where the CI 5 is inserted into the MsgO, for example, the PDCCH control unit 25 performs reception processing of the PDSCH by using the component carrier indicated by the CI. In the start of the reception processing, activation of the component carrier and allocation of the buffer which 10 stores the received user data may be included.
The data plane unit 26 controls transmission and reception of the user data between the base station 10, the relay station 30, and its own station. For example, the data plane unit 26 performs processes of the PDCH, RLC, 15 and MAC.
The RAR control unit 27 controls MAC signaling during the random access procedure. Specifically, the RAR control unit 27 analyzes the Msg2 to be received through the PDSCH from the base station 10 or the relay station 30, 20 and performs a process based on the information included in the Msg2. In the case where the CI is inserted into the Msg2, for example, reception processing of the PDSCH is performed by the component carrier indicated by the CI.
Also in the relay station 30, a radio
communication unit and a control unit may be provided in
the same manner as in the base station 10 and the mobile
station 20 . In that case, with regard to the radio
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2018201610 06 Mar 2018 communication between the base station 10 and its own station, the control unit of the relay station 30 performs the same process as that of the control unit 23 of the mobile station 20. With regard to control of the radio 5 communication between the mobile station 20 and its own station, the control unit of the relay station 30 further performs the same process as that of the control unit 14 of the base station 10.
FIG. 8 is a flowchart illustrating a process of the base station according to the second embodiment. The process illustrated in FIG. 8 includes the following steps :
(Step Sill) The control unit 14 sets states of the CC#1 to #5 with respect to the mobile station 20.
Specifically, the control unit 14 identifies the abovedescribed Configured but Deactivated CC, Configured and
Activated CC, and PDCCH monitoring set.
(Step S112) The control unit 14 determines whether to implement control unit communication cross carrier scheduling.
determines whether to except for the component
Specifically, the perform the data carrier in which the dedicated preamble notification (MsgO) is transmitted.
The control unit 14 determines whether to implement the cross carrier scheduling, for example based on a size of data to be transmitted to the mobile station 20 and communication quality of the component carrier in which the MsgO is transmitted.
If not, the process advances to
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2018201610 06 Mar 2018 step S113. If so, the process proceeds to step S114.
(Step S113) The PDCCH control unit 16 sets Oblll in a CI field (CIF) included in the MsgO. This binary digit string represents that data communication is performed by the component carrier in which the MsgO is transmitted. In place of Oblll, the PDCCH control unit 16 may set the 3-bit CI indicating the component carrier in which the MsgO is transmitted. The process then proceeds to step S116.
(Step S114) From among the CC#1 to #5, the control unit 14 selects one or a plurality of the component carriers in which the data communication is performed except for the component carrier in which the MsgO is transmitted. The control unit 14 selects the component carrier, for example, based on a size of data to be transmitted to the mobile station 20 or communication quality of the CC#1 to #5.
(Step S115) The PDCCH control unit 16 sets a 3-bit
CIF indicating the component carrier selected at step S114 in a CIF included in the MsgO. The PDCCH control unit 16 transmits the MsgO for each component carrier selected at step S114.
(Step S116) The radio communication unit 11 transmits the MsgO including the CIF set at step S113 or 25 S115 to the mobile station 20 by using the component carrier included in the PDCCH monitoring set. In the case where the plurality of the component carriers are
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2018201610 06 Mar 2018 selected at step S114, the radio communication unit 11 transmits a plurality of the MsgO sets. The plurality of the MsgO sets may be transmitted by the same radio transmission unit (e.g., the same subframe), or dispersed 5 into the different radio transmission units (e.g., different subframes) for transmission.
(Step S117) In the case where the component carrier notified by the MsgO is set as the Configured but Deactivated CC (de-active state), the control unit 14 10 changes it into the Configured and Activated CC (active state) . The radio communication unit 11 receives the random access preamble (Msgl) from the mobile station 20 by using the component carrier notified by the MsgO.
(Step S118) The RAR control unit 18 generates the random access response (Msg2) not including the CIF. The radio communication unit 11 transmits the Msg2 to the mobile station 20 by using the component carrier in which the Msgl is received. Then, the data communication is performed by the component carrier in which the Msgl and 20 the Msg2 are transmitted and received.
FIG. 9 is a flowchart illustrating a process of the mobile station according to the second embodiment. The process illustrated in FIG. 9 includes the following steps :
(Step S121) The control unit 23 sets states of the
CC#1 to #5. Specifically, the control unit 23 identifies the Configured but Deactivated CC, the Configured and
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Activated CC, and the PDCCH monitoring set. The radio communication unit 21 monitors the PDCCH of the component carrier included in the PDCCH monitoring set.
(Step S122) The radio communication unit 21 receives the MsgO from the base station 10 by using the component carrier included in the PDCCH monitoring set.
The PDCCH control unit 25 extracts the CIF included in the MsgO. In the case where the plurality of the MsgO sets are received, the PDCCH control unit 25 extracts the CIF in 10 each MsgO.
(Step S123) The PDCCH control unit 25 identifies the component carrier indicated by the CIF extracted at step S122, and performs reception processing of the PDSCH by using the above component carrier. In the case where 15 the component carrier indicated by the CIF is set as the Configured but Deactivated CC, the PDCCH control unit 25 changes it into the Configured and Activated CC. The cross carrier setting unit 22 sets a frequency band for performing signal processing.
(Step S124) The radio communication unit 21 transmits the Msgl using a signal sequence specified by the MsgO to the base station 10 through the PRACH of the component carrier indicated by the CIF. In the case where the plurality of the MsgO sets are received and the 25 plurality of the component carriers are identified at step
S123, the radio communication unit 21 transmits the Msgl for each identified component carrier. The radio
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2018201610 06 Mar 2018 communication unit 21 may transmit a plurality of the Msgl sets at the same timing or at the different timing.
(Step S125) The radio communication unit 21 receives the Msg2 from the base station 10 by using the 5 component carrier in which the Msgl is transmitted. The
RAR control unit 27 performs a process based on information included in the Msg2. The radio communication unit 21 performs data communication by using the component carrier in which the Msgl and the Msg2 are transmitted and 10 received.
FIG. 10 illustrates a first random access example according to the second embodiment. Suppose here that the mobile station 20 sets the CC#1 and #2 as the Configured and Activated CC and the CC#3 to #5 as the Configured 15 but Deactivated CC. Suppose further that the PDCCH monitoring set includes only the CC#1.
(Step S131) The base station 10 transmits the MsgO including CIF=0b001 to the mobile station 20 by using the CC#1 set as the PDCCH monitoring set.
(Step S132) The mobile station 20 transmits the
Msgl to the base station 10 by using the CC#2 indicated by the CIF=0b001. Since the CC#2 is set as the Configured and Activated CC, the mobile station 20 need not change a state of the CC#2.
(Step S133) The base station 10 transmits the Msg2 to the mobile station 20 by using the CC#2 in which the Msgl is received. For example, the mobile station 20 then
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2018201610 06 Mar 2018 transmits data to the base station 10 by using the CC#2 .
Transmission characteristics of radio signals are different in each component carrier (in each frequency band) . Therefore, when the Msgl and the Msg2 are 5 transmitted and received by the component carrier in which the data communication is performed, stabilization of the data communication is effectively attained. In addition, for ease of explanation of FIG. 10, only the CC#1 is set as the PDCCH monitoring set and further any CC may be 10 also set as the PDCCH monitoring set. In this case, the MsgO is transmitted by the CC set as the PDCCH monitoring set .
FIG. 11 illustrates a second random access example according to the second embodiment. States of the CC#1 to 15 #5 at the time of starting the random access procedure are the same as those of FIG. 10.
(Step S141) The base station 10 transmits the MsgO including CIF=0b010 to the mobile station 20 by using the CC#1 set as the PDCCH monitoring set. Since the CC#3 20 indicated by the CIF=0b010 is set as the Configured but Deactivated CC, it is activated and changed into the Configured and Activated CC.
(Step S142) The mobile station 20 transmits the
Msgl to the base station 10 by using the CC#3 indicated by 25 the CIF=0b010. At this time, in the same manner as in the base station 10, the mobile station 20 activates the CC#3 and changes it into the Configured and Activated CC.
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2018201610 06 Mar 2018 (Step S143) The base station 10 transmits the Msg2 to the mobile station 20 by using the CC#3 in which the Msgl is received. For example, the mobile station 20 then transmits data to the base station 10 by using the CC#3.
While performing a procedure for transmitting and receiving the MsgO and the Msgl, the base station 10 and the mobile station 20 change a state of the CC#3. Specifically, the MsgO and the Msgl double as signaling for changing a state of the CC#3. Accordingly, the base 10 station 10 and the mobile station 20 need not separately perform the signaling for changing a state of the CC#3.
FIG. 12 illustrates a third random access example according to the second embodiment. States of the CC#1 to #5 at the time of starting the random access procedure are 15 the same as those of FIG. 10.
(Step S151) The base station 10 transmits the MsgO including the CIF=0b001 to the mobile station 20 by using the CC#1 set as the PDCCH monitoring set.
(Step S152) The base station 10 transmits the MsgO including the CIF=0b010 to the mobile station 20 by using the CC#1. Since the CC#3 indicated by the CIF=0b010 is set as the Configured but Deactivated CC, the base station 10 activates the CC#3 and changes it into the Configured and Activated CC. The base station 10 may further 25 transmit two MsgO sets at the same timing.
(Step S153) The mobile station 20 transmits the
Msgl to the base station 10 by using CC#2 indicated by the
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CIF=0b001.
(Step S154) The mobile station 20 transmits the Msgl to the base station 10 by using the CC#3 indicated by the CIF=0b010. At this time, in the same manner as in the 5 base station 10, the mobile station 20 activates the CC#3 and changes it into the Configured and Activated CC. The mobile station 20 may further transmit two Msgl sets at the same timing.
(Step S155) By using the CC#2, the base station 10
10 receives the Msgl and transmits the Msg2 to the mobile
station 20. By using the CC#2, for example, the mobile
station 20 then transmits data to the base stati on 10 .
(Step S156) By using the CC#3, the base station 10
receives the Msgl and transmits the Msg2 to the mobile
15 station 20. By using the CC#3, for example, the mobile
station 20 then transmits data to the base stati on 10 .
The signal seguence specified by the MsgO
transmitted at step S151 and the signal seguence specified by the MsgO transmitted at step S152 may be the same or 20 different from each other. Specifically, with respect to the Msgl transmitted at step S153 and the Msgl transmitted at step S154, the mobile station 20 may use the same signal seguence or different signal seguence.
In the above-described example of the cross carrier scheduling, the base station 10 is supposed to recognize states of the CC#1 to #5 of the mobile station 20. In the case where the base station 10 or the mobile
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2018201610 06 Mar 2018 station 20 has a reason that some of the component carriers among the CC#1 to #5 are unusable, the base station 10 excludes such a component carrier and selects the component carrier in which the data communication is 5 performed. The above-described cross carrier scheduling is implemented, for example, at the time when the mobile station 20 performs random access to the base station 10 from a state of the connected mode or idle mode.
FIG. 13 illustrates a first format example of the
MsgO. The MsgO is a control message to be transmitted through the PDCCH. As a field, the MsgO includes Flag, Local/Dist, Resource Block Assignment, Preamble Index, PRACH Mask Index, Carrier Indicator, and CRC. A bit length of the Resource Block Assignment field is different depending on a DL bandwidth of the component carrier. FIG.
illustrates a bandwidth by using the number of RBs (resource blocks) . Here, 100 RBs are equal to a 20 MHz width.
Fields except the Carrier Indicator field are described, for example, in Evolved Universal Terrestrial
Radio Access (E-UTRA); Multiplexing and channel coding (3GPP, TS 36.212 V9.0.0, 2009-12). In the second embodiment, the Flag is fixed to 1, the Local/Dist is fixed to 0, and all of the Resource Block Assignment sets are fixed to 1. When a fixed bit is inserted to lengthen the MsgO, accuracy of the error detection is improved. The Preamble Index indicates information for specifying the
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2018201610 06 Mar 2018 signal sequence used for the Msgl. The PRACH Mask Index indicates information used for transmitting the Msgl. The CRC indicates a parity used for the error detection of the MsgO .
As described above, the Carrier Indicator indicates a 3-bit binary bit string for specifying the component carrier in which the data transmission is performed. In an example of FIG. 13, the Carrier Indicator field is inserted between the PRACH Mask Index field and 10 the CRC field. In the above-described literatures Evolved Universal Terrestrial Radio Access (E-UTRA); and Multiplexing and channel coding, there is described a format on which the Padding field is provided between the PRACH Mask Index field and the CRC field.
FIG. 14 illustrates a second format example of the
MsgO. In the format example of FIG. 14, most significant 3 bits of the binary bit string allocated to the Resource Block Assignment field in the format example of FIG. 13 is allocated to the Carrier Indicator field. Specifically, the Carrier Indicator field is inserted between the Local/Dist field and the Resource Block Assignment field. The Padding field is provided between the PRACH Mask Index field and the CRC field. All the Padding sets are fixed to
1.
FIG. 15 illustrates a third format example of the
MsgO. In the format example of FIG. 15, least significant 3 bits of the binary bit string allocated to the Resource
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Block Assignment field in the format example of FIG. 13 is allocated to the Carrier Indicator field. Specifically, the Carrier Indicator field is inserted between the Resource Block Assignment field and the Preamble index 5 field.
In addition to format examples of FIGS. 14 and 15, there is also considered a method in which intermediate significant 3 bits of the binary digit string allocated to the resource block assignment field of the format example 10 of FIG. 13 are allocated to the carrier indicator field.
Incidentally, in the format example, a data length of the MsgO is different depending on a DL bandwidth of the component carrier. Therefore, a plurality of the MsgO sets having different data lengths may be transmitted by 15 the CC#1. Suppose, for example, that a DL bandwidth of the CC#2 is 20 MHz and a DL bandwidth of the CC#3 is 10 MHz. In this case, the MsgO corresponding to the CC#2 and the MsgO corresponding to the CC#3 have different data lengths.
On the other hand, the mobile station 20 blind20 decodes the PDCCH and extracts the MsgO. Accordingly, for reducing an overhead of the blind decoding, the mobile station 20 preferably adjusts a size so that a size of the MsgO may be constant even if the DL bandwidth is different depending on the component carrier. Further, for facilitating the extraction of the CIF, the mobile station 20 preferably makes constant a position of the CIF in the entire MsgO.
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FIG. 16 illustrates a first size adjustment example of the MsgO. The size adjustment example of FIG.
corresponds to the format example illustrated in FIG.
13. In this size adjustment example, the PADDING field having a length according to the DL bandwidth is inserted between the Resource block Assignment field and the
Preamble Index field. Through the process, a size of the
MsgO becomes constant without relation to the DL bandwidth. Since a position of the CIF is constant, after the decoding of the MsgO, the CIF is easily extracted to identify the component carrier to be used. Further, since positions of the Preamble Index field and the PRACH Mask Index field are constant, the Msgl is easily generated with reference to the above fields.
FIG. 17 illustrates a second size adjustment example of the MsgO. The size adjustment example of FIG.
corresponds to the format example illustrated in FIG.
14. In the same manner as in the size adjustment example of FIG. 16, the PADDING field having a length according to the DL bandwidth is inserted between the Resource block Assignment field and the Preamble Index field. Through the process, a size of the MsgO becomes constant, and at the same time a position of the CIF becomes constant without relation to the DL bandwidth. Positions of the Preamble 25 Index field and the PRACH Mask Index field further become constant.
FIG. 18 illustrates a third size adjustment
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2018201610 06 Mar 2018 example of the MsgO. The size adjustment example of FIG.
corresponds to the format example illustrated in FIG.
15. In this size adjustment example, the PADDING field having a length according to the DL bandwidth is inserted 5 between the Local/Dist field and the Resource Block Assignment field. Through the process, a size of the MsgO becomes constant, and at the same time a position of the CIF becomes constant without relation to the DL bandwidth.
Positions of the Preamble Index field and the PRACH Mask 10 Index field further become constant.
According to this mobile communication system of the second embodiment, by transmitting the MsgO to the mobile station 20, the base station 10 gives to the mobile station 20 the use permission of the component carriers 15 except the component carrier in which the MsgO is transmitted. In other words, the base station 10 implements the cross carrier scheduling by using the MsgO. Accordingly, the base station 10 and the mobile station 20 need not separately perform a procedure of the use 20 permission of the component carrier.
The base station 10 and the mobile station 20 further change the component carrier in a de-active state into that in an active state along with the transmission and reception of the MsgO and the Msgl. Accordingly, the 25 base station 10 and the mobile station 20 need not separately perform a procedure of the state change of the component carrier. As can be seen from the above
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2018201610 06 Mar 2018 description, the base station 10 and the mobile station 20 effectively perform use control of the plurality of the component carriers .
Third Embodiment
Next, a third embodiment will be third embodiment will be described with difference from the above-described second the same matters will not be repeated.
embodiment, the MsgO, scheduling embodiment.
the and is described. The a focus on a embodiment, and
In the second cross carrier scheduling is implemented by on the other implemented by mobile communication hand the the Msg2 cross carrier in the third system according to the third embodiment configuration as according to the is implemented by the same that of the mobile communication second embodiment
A base station and are implemented by of the base embodiment embodiment numerals the base process steps :
system system illustrated in FIG. 2.
station mobile station of the third embodiment the illustrated will used in station same block and mobile in FIGS.
configurations as station and be described below by
FIGS. 2, 6, and 7.
those of the second
The third using reference is a flowchart illustrating a process of according to the third embodiment. The illustrated in FIG. 19 includes the following (Step S211) The control unit 14 sets states of the
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6
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CC#1 to #5 with regard to the mobile station 20. Specifically, the control unit 14 identifies the abovedescribed Configured but Deactivated CC, Configured and Activated CC, and PDCCH monitoring set.
(Step S212) The PDCCH control unit 16 generates the dedicated preamble notification (MsgO) not including the CIF. The radio communication unit 11 transmits the MsgO to the mobile station 20 by using the component carrier included in the PDCCH monitoring set.
(Step S213) The radio communication unit 11 receives the random access preamble (Msgl) from the mobile station 20 by using the component carrier in which the MsgO is transmitted.
(Step S214) The control unit 14 determines whether to implement the cross carrier scheduling. Specifically, the control unit 14 determines whether to perform the data communication except for the component carrier in which the random access response (Msg2) is transmitted. If not, the process advances to step S215. If so, the process proceeds to step S216.
(Step S215) The RAR control unit 18 sets the Oblll in the CIF included in the Msg2. This binary digit string indicates that the data communication is performed by the component carrier in which the Msg2 is transmitted. The 25 process then proceeds to step S218.
(Step S216) From among the CC#1 to #5, the control unit 14 selects one or a plurality of component carriers
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2018201610 06 Mar 2018 in which the data communication is performed, except for the component carrier in which the Msg2 is transmitted.
(Step S217) The RAR control unit 18 sets a 3-bit
CIF indicating the component carrier selected at step S216.
Note that the Msg2 is transmitted for each component carrier selected at step S216.
(Step S218) The radio communication unit 11 transmits the Msg2 including the CIF set at step S215 or S217 to the mobile station 20 by using the component 10 carrier included in the PDCCH monitoring set. In the case where the plurality of the component carriers are selected at step S216, the radio communication unit 11 transmits a plurality of the Msg2 sets. In the case where the component carrier notified by the Msg2 is set as the 15 Configured but Deactivated CC (de-active state), the control unit 14 changes it into the Configured and Activated CC (active state). The radio communication unit 11 then performs the data communication by using the component carrier notified by the Msg2.
FIG. 20 is a flowchart illustrating a process of the mobile station according to the third embodiment. The
process illustrated in FIG. 20 includes the following
steps : (Step S221) The control unit 23 sets states of the
25 CC#1 to #5. Specifically, the control unit 23 identifies
the Configured but Deactivated CC, the Configured and
Activated CC, and the PDCCH monitoring set. The radio
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2018201610 06 Mar 2018 communication unit 21 monitors the PDCCH of the component carrier included in the PDCCH monitoring set/'.
(Step S222) The radio communication unit 21 receives the MsgO not including the CIF from the base station 10 by using the component carrier included in the PDCCH monitoring set.
(Step S223) The radio communication unit 21 transmits the Msgl using the signal sequence specified by the MsgO to the base station 10 by using the PRACH of the 10 component carrier in which the MsgO is transmitted.
(Step S224) The radio communication unit 21 receives the Msg2 from the base station 10 by using the component carrier in which the Msgl is transmitted. The RAR control unit 27 extracts the CIF included in the Msg2.
In the case where the plurality of the Msg2 sets are received, the RAR control unit 27 extracts the CIF for each Msg2.
(Step S225) The RAR control unit 27 identifies one or the plurality of the component carriers indicated by 20 the CIF extracted at step S224, and performs reception processing of the PDSCH by using the component carriers. In the case where the component carrier indicated by the CIF is set as the Configured but Deactivated CC, the RAR control unit 27 changes it into the Configured and 25 Activated CC. The cross carrier setting unit 22 sets a frequency band for performing signal processing.
(Step S226) The radio communication unit 21
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2018201610 06 Mar 2018 performs data communication by using the component carrier identified at step S225.
FIG. 21 illustrates a first random access example according to the third embodiment. Suppose here that the 5 mobile station 20 sets the CC#1 and #2 as the Configured and Activated CC and the CC#3 to #5 as the Configured but Deactivated CC. Suppose further that the PDCCH monitoring set includes only the CC#1.
(Step S231) The base station 10 transmits the MsgO 10 to the mobile station 20 by using the CC#1 set as the
PDCCH monitoring set.
(Step S232) The mobile station 20 transmits the
Msgl to the base station 10 by using the CC#1 in which the
MsgO is received.
(Step S233) The base station 10 transmits the Msg2 including the CIF=0b001 to the mobile station 20 by using the CC#1 in which the Msgl is received. In the Msg2, timing adjustment information on the UL frequency band of the CC#2 is included.
(Step S234) By using the CC#2 indicated by the
CIF=0b001, for example, the mobile station 20 transmits data to the base station 10. Note that since the CC#2 is set as the Configured and Activated CC, the mobile station 20 need not change a state of the CC#2.
FIG. 22 illustrates a second random access example according to the third embodiment. The states of the CC#1 to #5 at the time of starting the random access procedure
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(Step S241) The base station 10 transmits the MsgO to the mobile station 20 by using the CC#1 set as the PDCCH monitoring set.
(Step S242) The mobile station 20 transmits the
Msgl to the base station 10 by using the CC#1 in which the MsgO is received.
(Step S243) The base station 10 transmits the Msg2 including the CIF=0b010 to the mobile station 20 by using 10 the CC#1 in which the Msgl is received. Since the CC#3 indicated by the CIF=0b010 is set as the Configured but Deactivated CC, the base station 10 activates the CC.#3 and changes it into the Configured and Activated CC. Note that in the Msg2, the timing adjustment information 15 on the UL frequency band of the CC#3 is included.
(Step S244) By using the CC#3 indicated by the CIF=0b010, for example, the mobile station 20 transmits data to the base station 10. At this time, in the same manner as in the base station 10, the mobile station 20 20 activates the CC#3 and changes the Configured but Deactivated CC into the Configured and Activated CC.
FIG. 23 illustrates a third random access example according to the third embodiment. The states of the CC#1 to #5 at the time of starting the random access procedure 25 are the same as those of FIG. 21.
(Step S251) The base station 10 transmits the MsgO to the mobile station 20 by using the CC#1 set as the
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PDCCH monitoring set.
(Step S252) The mobile station 20 transmits the Msgl to the base station 10 by using the CC#1 in which the MsgO is received.
(Step S253) The base station 10 transmits the Msg2 including the CIF=0b001 to the mobile station 20 by using the CC#1 in which the Msgl is received. Note that in the Msg2, the timing adjustment information on the UL frequency band of the CC#2 is included.
(Step S254) The base station 10 transmits the Msg2 including the CIF=0b010 to the mobile station 20 by using the CC#1 in which the Msgl is received. Since the CC#3 indicated by the CIF=0b010 is set as the Configured but Deactivated CC, the base station 10 activates the CC#3 and changes it into the Configured and Activated CC.
Note that in the Msg2, the timing adjustment information on the UL frequency band of the CC#3 is included.
(Step S255) By using the CC#2 indicated by the CIF=0b001, for example, the mobile station 20 transmits 20 data to the base station 10.
(Step S256) By using the CC#3 indicated by the
CIF=0b010, for example, the mobile station 20 transmits data to the base station 10. At this time, in the same
manner as in the base station 10, the mobile station 20
25 activates the CC#3 and changes the Configured but
Deactivated CC into the Configured and Activated CC.
FIG. 24 illustrates a first format example of the
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Msg2. In the format example of FIG. 24, the Msg2 includes a Carrier Indicator of 3 bits, a Timing Advance Command of 6 bits, a UL grant of 20bits, and a Temporary C-RNTI of 16bits.
As described above, the carrier indicator is a value for discriminating the component carrier in which the data transmission is performed. The Timing Advance Command is a value indicating an amount of the timing adjustment at the time of allowing the mobile station 20 10 to correct the UL transmission timing. The UL grant is information illustrating the UL radio resource allocated to the mobile station 20. The Temporary C-RNTI is an identifier dynamically allocated to the mobile station 20 through the base station 10. In addition, the Timing 15 Advance Command indicates the amount of timing adjustment relating to the component carrier indicated by the Carrier Indicator. Accordingly, the mobile station 20 adjusts the UL transmission timing after the random access procedure by using the Timing Advance Command.
Here, the Timing Advance Command is described, for example, in Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (3GPP TS 36.213 V9.0.1, 2009-12) .
In the above-described literature, two types of an absolute value in a displacement of the timing and a relative value using as a reference the currently corrected timing are defined as the Timing Advance Command.
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The absolute value is used in the case where the Timing
Advance Command is first notified, or a validity period of a previously notified Timing Advance Command is expired.
The relative value is used in the case where the validity period of the previously notified Timing Advance Command is not expired. The absolute value is represented by 11 bits and the relative value is represented by 6 bits. In the format example of FIG. supposed to be used.
In the above format reserved bit is set to one.
the Msg2 not including the CIE process, the mobile station the Msg2 includes the CIF.
FIG. 25 illustrates a
Msg2. In the format example (
24, the relative value is example, a most significant
A most significant R bit of is set to zero. Through the easily determines whether second format example of the of FIG. 25, the Msg2 includes the Timing Advance Command of 11 bits, the UL grant of 20 bits, the Carrier Indicator of 3 bits, and the Temporary
C-RNTI of 13 bits. In the case of this format example, the absolute value may be used as the Timing Advance Command.
On the other hand, the Temporary C-RNTI is smaller by 3 bits than that in the case of FIG. 24. The base station 10 allocates an identifier capable of being represented by 13 bits or less to the mobile station 20.
FIG. 26 illustrates a third format example of the
Msg2. In the format example of FIG. 26, the Msg2 includes the Timing Advance Command of 11 bits, the UL grant of 20
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2018201610 06 Mar 2018 bits, the Temporary C-RNTI of 16 bits, and the Carrier Indicator of 3 bits. In the case of this format example, the absolute value may be used as the Timing Advance
Command. The base station 10 allocates an identifier having a value larger than that of FIG. 25 to the mobile station 20. Note that a size of the Msg2 increases more than those of the format examples of FIGS. 24 and 25. In addition, the CIF may be provided on the least significant bits in FIG. 26, and further the CIF may be inserted into 10 the other positions.
According to this mobile communication system of the third embodiment, by transmitting the Msg2 to the mobile station 20, the base station 10 gives to the mobile station 20 a use permission of the component carriers 15 except the component carrier in which the Msg2 is transmitted. In short, the base station 10 implements the cross carrier scheduling by using the Msg2. Accordingly, the base station 10 and the mobile station 20 need not separately perform a procedure for the use permission of 20 the component carrier.
The base station 10 and the mobile station 20 further change the component carrier in a de-active state into that in an active state along with transmission and reception of the Msg2. Therefore, the base station 10 and 25 the mobile station 20 need not separately perform a procedure for a state change in the component carrier. As can be seen from the above description, the base station
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2018201610 06 Mar 2018 and the mobile station 20 effectively perform use control of the plurality of the component carriers in the same manner as in the second embodiment.
Fourth Embodiment
Next, a fourth embodiment will be described. The fourth embodiment will be described with a focus on a difference from the above-described second and third embodiments, and the same matters will not be repeated. In the fourth embodiment, the cross carrier scheduling is 10 implemented by the Msg2 in the same manner as in the third embodiment. Note that the non-contention based random access is supposed in the third embodiment, and on the other hand the contention based random access is supposed in the fourth embodiment.
A mobile communication system according to the fourth embodiment is implemented by the same system configuration as that of the mobile communication system according to the second embodiment illustrated in FIG. 2. A base station and mobile station according to the fourth 20 embodiment are further implemented by the same block configuration as those of the base station 10 and mobile station 20 of the second embodiment illustrated in FIGS. 6 and 7. Hereinafter, the fourth embodiment will be described by using reference numerals used in FIGS. 2, 6, and 7.
FIG. 27 is a flowchart illustrating a process of the base station according to the fourth embodiment. The
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2018201610 06 Mar 2018 process illustrated in FIG. 27 includes the following steps :
(Step S311) The control unit 14 sets states of the CC#1 to #5 with regard to the mobile station 20.
Specifically, the control unit 14 identifies the abovedescribed Configured but Deactivated CC, Configured and Activated CC, and PDCCH monitoring set.
(Step S312) The radio communication unit 11 receives the random access preamble (Msgl) from the mobile 10 station 20 by using the component carrier included in the PDCCH monitoring set. A signal sequence used in the Msgl is randomly selected by the mobile station 20.
(Step S313) The control unit 14 determines whether to implement the cross carrier scheduling. If not, the 15 process advances to step S314. If so, the process proceeds to step S315.
(Step S314) The RAR control unit 18 sets the Oblll as the CIF included in the Msg2. The process then proceeds to step S317.
(Step S315) From among the CC#1 to #5, the control unit 14 selects one or a plurality of component carriers in which the data communication is performed, except for the component carrier in which the Msg2 is transmitted.
(Step S316) The RAR control unit 18 sets a 3-bit
CIF indicating the component carrier selected at step S315.
In addition, the Msg2 is transmitted for each component carrier selected at step S315.
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2018201610 06 Mar 2018 (Step S317) The radio communication unit 11 transmits the Msg2 including the CIF set at step S314 or S316 to the mobile station 20 by using the component carrier in which the Msgl is received. In the case where 5 the plurality of the component carriers are selected at step S315, the radio communication unit 11 transmits a plurality of the Msg2 sets.
(Step S318) The radio communication unit 11 receives the Msg3 from the mobile station 20 by using the 10 component carrier notified by the Msg2. At this time, in the case where the component carrier notified by the Msg2 is set as the Configured but Deactivated CC (de-active state) , the control unit 14 changes it into the
Configured and Activated CC (active state).
(Step S319) The radio communication unit 11 transmits the Msg4 to the mobile station 20 by using the component carrier in which the Msg3 is received. The radio communication unit 11 then performs data communication by using the component carrier in which the Msg3 and the Msg4 20 are transmitted and received.
FIG. 28 is a flowchart illustrating a process of the mobile station according to the fourth embodiment. The process illustrated in FIG. 28 includes the following steps :
(Step S321) The control unit 23 sets states of the
CC#1 to #5. Specifically, the control unit 23 identifies the Configured but Deactivated CC, the Configured and
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Activated CC, and the PDCCH monitoring set. The radio communication unit 21 monitors the PDCCH of the component carrier included in the PDCCH monitoring set.
(Step S322) The radio communication unit 21 transmits the Msgl using the randomly selected signal seguence to the base station 10 by using the PRACH of the component carrier included in the PDCCH monitoring set.
(Step S323) The radio communication unit 21 receives the Msg2 from the base station 10 by using the 10 component carrier in which the Msgl is transmitted. The
RAR control unit 27 extracts the CIF included in the Msg2.
In the case where the plurality of the Msg2 sets are received, the RAR control unit 27 extracts the CIF for each Msg2.
(Step S324) The RAR control unit 27 identifies one or the plurality of the component carriers indicated by the CIF extracted at step S323. In the case where the component carrier indicated by the CIF is set as the Configured but Deactivated CC, the RAR control unit 27 changes it into the Configured and Activated CC. The cross carrier setting unit 22 sets a freguency band for performing signal processing.
(Step S325) The radio communication unit 21 transmits the Msg3 to the base station 10 by using the component carrier indicated by the CIF.
In the case where the plurality of the Msg2 sets are received and the plurality of the component carriers are identified at step
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S324, the radio communication unit 21 transmits the Msg3 to the base station 10 for each of the identified component carriers. The plurality of the Msg3 sets may be transmitted at the same timing, or at different timing.
(Step S326) The radio communication unit 21 receives the Msg4 from the base station 10 by using the component carrier in which the Msg3 is transmitted. The radio communication unit 21 then performs data communication by using the component carrier in which the 10 Msg3 and the Msg4 are transmitted and received.
FIG. 29 illustrates a first random access example according to the fourth embodiment. Suppose here that the mobile station 20 sets CC#1 and #2 as the Configured and Activated CC and the CC#3 to #5 as the Configured but 15 Deactivated CC. Suppose further that the PDCCH monitoring set includes only the CC#1.
(Step S331) The mobile station 20 transmits the Msgl using the randomly selected signal sequence to the base station 10 by using the CC#1 set as the PDCCH 20 monitoring set.
(Step S332) The base station 10 transmits the Msg2 including the CIF=0b001 to the mobile station 20 by using the CC#1 in which the Msgl is received.
(Step S333) The mobile station 20 transmits the
Msg3 to the base station 10 by using the CC#2 indicated by the CIF=0b001.
(Step S334) The base station 10 transmits the Msg4
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2018201610 06 Mar 2018 to the mobile station 20 by using the CC#2 in which the
Msg3 is received. By using the CC#2, for example, the mobile station 20 then transmits data to the base station
10. Note that in the case where contention of the random access occurs, the mobile station 20 transmits the Msgl to the base station 10 again.
FIG. 30 illustrates a second random access example according to the fourth embodiment. States of the CC#1 to #5 at the time of starting the random access procedure are 10 the same as those of FIG. 29.
(Step S341) The mobile station 20 transmits the
Msgl using the randomly selected signal sequence to the base station 10 by using the CC#1 set as the PDCCH monitoring set.
(Step S342) The base station 10 transmits the Msg2 including the CIF=0b010 to the mobile station 20 by using the CC#1 in which the Msgl is received. Since the CC#3 indicated by the CIF=0b010 is set as the Configured but Deactivated CC, the base station 10 activates the CC#3 and changes it into the Configured and Activated CC.
(Step S343) The mobile station 20 transmits the
Msg3 to the base station 10 by using the CC#3 indicated by the CIF=0b010. In the same manner as in the base station
10, the mobile station 20 activates the CC#3 and changes the Configured but Deactivated CC into the Configured and Activated CC.
(Step S344) The base station 10 transmits the Msg4
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2018201610 06 Mar 2018 to the mobile station 20 by using the CC#3 in which the Msg3 is received. By using the CC#3, for example, the mobile station 20 then transmits data to the base station 10 .
FIG. 31 illustrates a third random access example according to the fourth embodiment. States of the CC#1 to #5 at the time of starting the random access procedure are the same as those of FIG. 29.
(Step S351) The mobile station 20 transmits the 10 Msgl using the randomly selected signal sequence to the base station 10 by using the CC#1 set as the PDCCH monitoring set.
(Step S352) The base station 10 transmits the Msg2 including the CIF=0b001 to the mobile station 20 by using 15 the CC#1 in which the Msgl is received.
(Step S353) The base station 10 transmits the Msg2 including the CIF=0b010 to the mobile station 20 by using the CC#1 in which the Msgl is received. Since the CC#3 indicated by the CIF=0b010 is set as the Configured but 20 Deactivated CC, the base station 10 activates the CC#3 and changes it into the Configured and Activated CC.
(Step S354) The mobile station 20 transmits the Msg3 to the base station 10 by using the CC#2 indicated by the CIF=0b001.
(Step S355) The mobile station 20 transmits the
Msg3 to the base station 10 by using the CC#3 indicated by the CIF=0b010. At this time, in the same manner as in the
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2018201610 06 Mar 2018 base station 10, the mobile station 20 activates station 10 transmits to the
Msg3 is to the
Msg3 is the CC#3 into the the Msg4 mobile station 20 by using the
CC#2 in which the received.
station 10 transmits the Msg4 mobile station 20 by using the
CC#3 in which the received.
As embodiment, embodiment a format of the
Msg2 according to the fourth the format example described is used. In the contention based in the third random access, since there is a possibility that the base station 10 does not recognize the mobile station 20 at the time of transmitting the Msg2, as in FIGS. 25 and 26 of an absolute value there are preferably used in which the Timing is transmitted.
embodiment, from the same reason, it is the mobile station 20 may use all or the predetermined component carriers.
Further, in the case of the random access, it is carrier scheduling is load balancing so that not intensely use formats
Advance
Command
In the fourth preferable that plurality of the contention based also considered implemented a plurality a specific that the cross for the purpose of a of mobile stations do component carrier, distributing the component carriers in which the random access procedure is performed to mitigate interference
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2018201610 06 Mar 2018 between cells, and distributing the component carriers in which the Msg3 is transmitted to reduce a contention probability.
According to the above-described mobile communication system of the fourth embodiment, the base station 10 implements the cross carrier scheduling by using the Msg2 in the same manner as in the third embodiment. Accordingly, a procedure of permission for the usage of the component carrier need not be separately 10 performed. Along with the transmission and reception of the Msg2 and the Msg3, the base station 10 and the mobile station 20 further change the component carrier in a deactive state into that in an activate state. Therefore, a procedure of the state change of the component carrier 15 need not be separately performed. As can be seen from the above discussion, the base station 10 and the mobile station 20 effectively perform use control of the plurality of the component carriers in the same manner as in the second and third embodiments.
The foregoing is considered as illustrative only of the principles of the present invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and applications shown 25 and described, and accordingly, all suitable modifications and equivalents may be regarded as falling within the scope of the invention in the appended claims and their
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Claims (4)

  1. CLAIMS:
    1. A radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of frequency bands, the radio communication apparatus comprising:
    a receiver configured to receive, when performing a random access procedure to the another radio communication apparatus, a control message by using a first frequency band as a last message among a plurality of messages transmitted by the radio communication apparatus in the random access procedure, the control message instructing communication using a second frequency band different from the first frequency band; and a controller configured to control communication according to reception of the control message, to perform data communication with the another radio communication apparatus by using the second frequency band.
  2. 2. A radio communication apparatus to perform communication with another radio communication apparatus by using a plurality of frequency bands, the radio communication apparatus comprising:
    a controller configured to select a second frequency band different from a first frequency band, as a frequency band to be used for data communication by the another radio communication apparatus; and a transmitter configured to transmit a control message to the another radio communication apparatus by using the first frequency band as a last message among a plurality of messages transmitted in a random access procedure when the random access procedure is performed, the control message instructing communication using the second frequency band selected by the controller.
  3. 3. A radio communication system to perform communication by using a plurality of frequency bands, the radio communication system comprising:
    a first radio communication apparatus configured to transmit a control message by using a first frequency band as a last message among a plurality of messages transmitted in a random access procedure when the random access procedure is performed, the control message instructing communication using a second frequency band different from the first frequency; and a second radio communication apparatus configured to receive the control message from
    21964609 (IRN: P038247D4)
    2018201610 31 Jan 2019 the first radio communication apparatus by using the first frequency band, and perform, according to reception of the control message, data communication by using the second frequency band.
  4. 4. A radio communication method for use in a radio communication system including first and second radio communication apparatuses to perform communication by using a plurality of frequency bands, the radio communication method comprising:
    transmitting, by the first radio communication apparatus, a control message to the second radio communication apparatus by using a first frequency band as a last message among a plurality of messages transmitted in a random access procedure when the random access procedure is performed by the second radio communication apparatus, the control message instructing communication using a second frequency band different from the first frequency band;
    receiving, by the second radio communication apparatus, the control message from the first radio communication apparatus by using the first frequency band; and performing, by the second radio communication apparatus, data communication by using the second frequency band according to reception of the control message.
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AU2015203078A AU2015203078B2 (en) 2010-02-12 2015-06-10 Wireless communication apparatus, wireless communication system and wireless communication method
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AU2016250481A AU2016250481B2 (en) 2010-02-12 2016-10-28 Radio communication apparatus, radio communication system, and radio communication method
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Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
3GPP, Technical Specification Group Radio Access Network, Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN), Release 9, 3GPP TS 36.300, V 9.2.0, December 2009 *
3GPP, Technical Specification Group Radio Access Network, Evolved Universal Terrestrial Radio Access (E-UTRA), Radio Resource Control (RRC), Protocol specification, Release 9, 3GPP TS 36.331, V9.1.0, Dec 2009 *
ERICSSON, ST ERICSSON, ‘Random Access with carrier aggregation', 3GPP TSG-RAN WG2, #68bis, Tdoc R2-100429, Valencia, Spain, 18th-22nd January 2010 *

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