WO2010103750A1 - 無線送受信装置、無線基地局、無線端末および無線通信システム - Google Patents
無線送受信装置、無線基地局、無線端末および無線通信システム Download PDFInfo
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- WO2010103750A1 WO2010103750A1 PCT/JP2010/001457 JP2010001457W WO2010103750A1 WO 2010103750 A1 WO2010103750 A1 WO 2010103750A1 JP 2010001457 W JP2010001457 W JP 2010001457W WO 2010103750 A1 WO2010103750 A1 WO 2010103750A1
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- 238000004891 communication Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 106
- 238000000034 method Methods 0.000 claims description 20
- 238000010187 selection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 33
- 239000000969 carrier Substances 0.000 description 12
- 239000000284 extract Substances 0.000 description 12
- 230000011664 signaling Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
Definitions
- the present invention relates to the technical field of wireless communication, and more particularly to a wireless communication system compatible with LTE-Advanced (Long Term Evolution Advanced).
- LTE-Advanced Long Term Evolution Advanced
- the LTE-Advanced system is a next generation mobile communication system that has evolved from LTE (Long Term Evolution), and aims to provide improved mobile communication services.
- LTE Long Term Evolution
- FIG. 22 is a diagram for explaining an operation assumed at the start of the LTE-Advanced service.
- LTE-Advanced dedicated carrier hereinafter referred to as “dedicated carrier”
- LTE and LTE-Advanced shared carrier hereinafter referred to as “shared carrier”. Operation by is assumed.
- the carrier means a frequency for transmitting a signal.
- LTE-A terminal Both the LTE terminal and the LTE-Advanced terminal (hereinafter referred to as “LTE-A terminal”) are accessible to the shared carrier. Only the LTE-Advanced terminal in the connected state can access the dedicated carrier. An LTE-A terminal in an idle state cannot camp on a dedicated carrier. This is because if the LTE-A terminal in the idle state can camp on the dedicated carrier, broadcast information needs to be transmitted on the dedicated carrier. An LTE-A terminal in a connected state can access a shared carrier.
- E-UTRA Evolved Universal Terrestrial Radio Access
- RRC Radio Resource Control
- broadcast information for the LTE-A terminal is transmitted.
- This broadcast information includes frequency priority information (hereinafter referred to as “priority information”) indicating carrier priority.
- priority information frequency priority information
- the priority is set so that the LTE-A terminal camps on the shared carrier.
- carrier selection is performed according to the priority information indicated in the broadcast information, the LTE-A terminal is preferentially connected to the shared carrier, and the shared carriers are crowded.
- an LTE-A terminal when an LTE-A terminal is connected to a base station of a shared carrier, the congestion of the shared carrier and the dedicated carrier is considered, and when the dedicated carrier is free, the LTE-A terminal Needs to be handed over to a dedicated carrier. That is, in order for the LTE-A terminal to connect to the dedicated carrier, it is necessary to perform both connection to the shared carrier and handover to the dedicated carrier.
- the present invention has been made in view of the above background, and an object thereof is to provide a radio base station, a radio terminal, and a radio communication system capable of connecting an LTE-A terminal to an appropriate carrier.
- the radio communication system of the present invention communicates only with LTE-Advanced terminals connected by a part of dedicated frequencies among a plurality of frequencies, and communicates with LTE terminals and LTE-Advanced terminals by the remaining shared frequencies And an LTE-Advanced terminal.
- the radio base station sets each priority of the shared frequency for an LTE-Advanced terminal in an idle state, and sets each priority of the plurality of frequencies for an LTE-Advanced terminal in a connected state And a priority information generation unit that generates priority information indicating the set priority, a notification information generation unit that generates notification information including the priority information, and a transmission unit that transmits the notification information.
- the LTE-Advanced terminal includes: a receiving unit that receives broadcast information; a priority determination unit that determines a priority of a frequency extracted from the broadcast information, the priority in an idle state and the priority in a connected state; A camping frequency selection unit that selects a frequency for camping when idle based on a priority in the idle state; a transmission frequency selection unit that selects a destination frequency of a RACH preamble based on a priority in the connected state; and A RACH preamble transmission unit that transmits the RACH preamble at the frequency selected by the frequency selection unit.
- the LTE-Advanced terminal can camp on the shared frequency according to the priority of the idle state. And can camp on the dedicated frequency according to the priority of the connected state.
- FIG. 1 is a diagram illustrating a signaling operation between a terminal and a base station according to the first embodiment.
- FIG. 2 is a diagram illustrating the configuration of the base station according to the first embodiment.
- FIG. 3 is a diagram illustrating a configuration of the LTE-A terminal according to the first embodiment.
- FIG. 4 is a flowchart showing the operation of the LTE-A terminal according to the first embodiment.
- FIG. 5 is a diagram showing an example of a priority information table for LTE-A terminals according to the second embodiment.
- FIG. 6 is a diagram illustrating signaling operations between a terminal and a base station according to the second embodiment.
- FIG. 7 is a diagram illustrating a configuration of a base station according to the second embodiment.
- FIG. 1 is a diagram illustrating a signaling operation between a terminal and a base station according to the first embodiment.
- FIG. 2 is a diagram illustrating the configuration of the base station according to the first embodiment.
- FIG. 3 is a diagram
- FIG. 8 is a diagram illustrating a configuration of the LTE-A terminal according to the second embodiment.
- FIG. 9 is a flowchart illustrating the operation of the LTE-A terminal according to the second embodiment.
- FIG. 10 is a diagram showing variations of the table indicating the priority information.
- FIG. 11 is a diagram showing variations of the table indicating the priority information.
- FIG. 12 is a diagram showing variations of a table indicating priority information
- FIG. 13 is a diagram showing variations of the table indicating the priority information.
- FIG. 14 is a diagram showing variations of a table indicating priority information.
- FIG. 15 is a diagram showing variations of the table indicating the priority information.
- FIG. 16 is a diagram illustrating an operation of signaling between a terminal and a base station according to the third embodiment.
- FIG. 16 is a diagram illustrating an operation of signaling between a terminal and a base station according to the third embodiment.
- FIG. 17 is a diagram illustrating a configuration of a base station according to the third embodiment.
- FIG. 18 is a diagram illustrating a configuration of the LTE-A terminal according to the third embodiment.
- FIG. 19 is a flowchart illustrating the operation of the LTE-A terminal according to the third embodiment.
- FIG. 20 is a diagram illustrating a configuration of the LTE-A terminal according to the fourth embodiment.
- FIG. 21 is a flowchart showing the operation of the LTE-A terminal according to the fourth embodiment.
- FIG. 22 is a diagram for explaining an operation assumed at the start of the LTE-Advanced service.
- priority information for LTE-A terminal 40 (hereinafter referred to as “idle terminal”) 40 in the idle state and LTE-A terminal (hereinafter referred to as “connected terminal”) in the connected state are used. ) Set priority information for 40 separately and include it in the broadcast information. This makes it possible to connect the LTE-A terminal 40 to the dedicated carrier only with the connection procedure.
- FIG. 1 is a diagram showing a signaling operation between the base station 10 and the LTE-A terminal 40 according to the first embodiment of the present invention.
- the LTE-A terminal 40 is camping on the shared carrier A when in the idle state (S10).
- the LTE-A terminal 40 acquires priority information for idle terminals and priority information for connected terminals from the broadcast information transmitted from the base station 10 (S12).
- the priority information is represented by a numerical value from 0 to 7 that can be expressed by 3 bits, and the larger the numerical value, the higher the priority.
- the priority information may be common for each tracking area, for example.
- the LTE-A terminal 40 selects, as a RACH preamble transmission destination carrier, an uplink carrier that is a pair of carriers whose highest priority is indicated in the priority information during RACH preamble transmission.
- the LTE-A terminal 40 creates a RACH preamble message using the RACH related parameters for the selected carrier and transmits it to the base station 10 (S14).
- S14 the base station 10
- an uplink carrier that is a pair of dedicated carriers is selected as a RACH preamble transmission destination carrier, and the RACH preamble is transmitted.
- the base station 10 processes the received RACH preamble and returns a RACH response (S16).
- the LTE-A terminal 40 transmits a connection request to the base station 10 (S18), and the base station 10 transmits a connection setting to the LTE-A terminal 40 (S20).
- the LTE-A terminal 40 transmits a connection completion for the connection setting (S22)
- the LTE-A terminal 40 establishes a connection with the base station 10 in a dedicated carrier and enters a connected state (S24).
- the base station 10 transmits RRC setting information to the LTE-A terminal 40 (S26), and the LTE-A terminal 40 that has received this transmits an RRC setting completion to the base station 10 (S28). Thereafter, data transmission / reception is performed between the LTE-A terminal 40 and the base station 10 (S30).
- the base station 10 transmits an RRC connection release message to the LTE-A terminal 40 (S32)
- the LTE-A terminal 40 disconnects from the base station 10 and returns from the connected state to the idle state (S34). If priority information for each LTE-A terminal 40 is included in the RRC connection release message, the priority information acquired by the broadcast information at the time of idle is overwritten. In the example shown in FIG. 1, since individual priority information is not instructed, the priority information instructed by the notification information is followed.
- the LTE-A terminal 40 selects a high-priority frequency according to the priority information instructed by the broadcast information or the RRC connection release message from the base station 10 and camps on. In the example shown in FIG. 1, since the shared carrier A is indicated as a high priority frequency in the broadcast information, the LTE-A terminal 40 selects the shared carrier A and camps on. The LTE-A terminal 40 receives the broadcast information through the shared carrier A (S36).
- FIG. 2 is a diagram illustrating a configuration of the base station 10 according to the first embodiment of the present invention.
- the base station 10 includes a priority information generation unit 12, a broadcast information creation unit 20, a terminal individual information creation unit 22, a transmission unit 24, a reception unit 26, and a RACH processing unit 28.
- the priority information generation unit 12 includes an LTE terminal priority setting unit 14 that sets priorities for LTE terminals, an idle terminal priority setting unit 16 that sets priorities for idle terminals, and a priority for connected terminals. Connected terminal priority setting unit 18, and outputs priority information indicating the priority for each terminal to broadcast information creation unit 20 and terminal individual information creation unit 22.
- the notification information creation unit 20 creates notification information including priority information for each terminal input from the priority information generation unit 12 and outputs the notification information to the transmission unit 24.
- the terminal individual information creation unit 22 creates terminal individual information including priority information for each terminal input from the priority information generation unit 12 and outputs the terminal individual information to the transmission unit 24.
- the transmission unit 24 transmits the broadcast information input from the broadcast information creation unit 20 and the terminal individual information input from the terminal individual information creation unit 22 from the antenna 30.
- the receiving unit 26 receives the RACH preamble message from the LTE-A terminal 40.
- the RACH processing unit 28 processes the RACH preamble message input from the receiving unit 26.
- FIG. 3 is a diagram illustrating a configuration of the LTE-A terminal 40 according to the first embodiment.
- the LTE-A terminal 40 includes a reception unit 44, a transmission unit 46, a broadcast information acquisition unit 48, a terminal individual information acquisition unit 50, a priority information determination unit 52, a frequency selection unit 54, and a RACH preamble creation unit 56.
- the receiving unit 44 receives broadcast information and terminal individual information transmitted from the base station 10.
- the broadcast information acquisition unit 48 extracts priority information and RACH related information from the broadcast information input from the reception unit 44 and outputs the priority information and RACH related information to the priority information determination unit 52 and the RACH preamble creation unit 56, respectively.
- the terminal individual information acquisition unit 50 extracts priority information from the terminal individual information input from the reception unit 44 and outputs the priority information to the priority information determination unit 52.
- the priority information determination unit 52 determines the idle terminal priority information and the connected terminal priority information input from the broadcast information acquisition unit 48 and the terminal individual information acquisition unit 50, and sends the determination result to the frequency selection unit 54. Output.
- the frequency selection unit 54 selects the frequency to camp in the idle state according to the determination result input from the priority information determination unit 52.
- the frequency selection unit 54 selects a RACH preamble transmission destination frequency in the connected state, and outputs information on the selected frequency to the RACH preamble creation unit 56.
- the RACH preamble creation unit 56 selects the RACH preamble parameter to be used from the RACH related information according to the frequency information of the RACH preamble transmission destination.
- the frequency information of the RACH preamble transmission destination is input from the frequency selection unit 54
- the RACH related information is input from the broadcast information acquisition unit 48.
- the RACH preamble creation unit 56 creates a RACH preamble message using the RACH preamble parameters and outputs the RACH preamble message to the transmission unit 46.
- the transmission unit 46 transmits the RACH preamble message input from the RACH preamble creation unit 56 from the antenna 42.
- FIG. 4 is a flowchart showing the operation of the LTE-A terminal 40 according to the first embodiment.
- the LTE-A terminal 40 receives broadcast information from the base station 10 (S40), and holds priority information for idle state and connected state (S42).
- the LTE-A terminal 40 selects a carrier having a high priority as the RACH preamble transmission destination carrier in the priority information for the connected terminal (S44).
- the RACH preamble parameter corresponding to the selected carrier is selected from the RACH related parameters acquired from the broadcast information (S46), and a RACH preamble message is created (S48).
- the LTE-A terminal 40 transmits the created RACH preamble message toward the RACH preamble transmission destination carrier selected by the priority information (S50).
- the LTE-A terminal transmits and receives data (S54).
- the LTE-A terminal 40 determines whether or not individual terminal priority information is instructed therein (S58). When the individual terminal priority information is instructed (YES in S58), the LTE-A terminal 40 overwrites the held priority information with the instructed priority information (S60). When the LTE-A terminal 40 changes from the connected state to the idle state, the LTE-A terminal 40 selects a camping frequency according to the priority information (S62).
- the wireless communication system according to the first embodiment has been described above.
- priority information for idle terminals and connected terminals is set.
- the LTE-A terminal 40 can be camped on the shared carrier during idle time, and the dedicated carrier can be selected and connected to the dedicated carrier during RACH preamble transmission.
- the priority for the idle terminal of the shared carrier A is made higher than the priority for the idle terminal of the shared carrier B, and the LTE-A terminals 40 in the idle state are aggregated in the shared carrier A.
- broadcast information and paging for the LTE-A terminal 40 can be transmitted only by the shared carrier A, and the signaling overhead in the entire shared carrier can be reduced.
- the LTE-A terminal 40 selects a carrier with better reception quality.
- priority information is given to a plurality of frequency bands (shared carriers A and B, dedicated carriers) included in one base station 10 has been described.
- Priority information may be assigned to.
- the same PCI Physical Cell Identity
- the LTE-A terminal 40 can recognize the base station 10 that owns the carrier.
- a flag may be given to another carrier managed by the base station 10 of the carrier camping on the LTE-A terminal 40. Thereby, it can show that it is a carrier by management of the same base station 10 as the base station 10 of the carrier which is camping.
- the base station and the LTE-A terminal have a common table in which combinations of priority information for idle terminals and priority information for connected terminals are recorded.
- the base station designates the idle terminal priority information and the connected terminal priority information by reference numbers defined in the common table. Thereby, the information amount of the priority information for the LTE-A terminal can be reduced.
- FIG. 5 is a diagram showing an example of a priority information table for LTE-A terminals according to the second embodiment.
- the table In the table, combinations of priority for idle terminals and priority for connected terminals are recorded. By reading the priority corresponding to the reference number from this table, the priority for the idle terminal and the priority for the connected terminal can be obtained.
- This table may be set when the LTE-A terminal is manufactured or sold, or may be transmitted as broadcast information.
- the priority for the idle state is the same as the priority for the connected state, and with reference numbers 5 to 7, the priority for the idle terminal is “0”.
- the idle terminal does not select the carrier set with the reference numbers 5 to 7 as the camping destination.
- a carrier with reference number “5” has a priority of “3” for a connected terminal, but a priority of “0” for an idle terminal.
- FIG. 6 is a diagram illustrating the signaling operation of the base station 10a and the LTE-A terminal 40a according to the second embodiment.
- the LTE-A terminal 40a is camping on the shared carrier A when in the idle state (S10).
- the LTE-A terminal 40a acquires priority information from the base station 10a by broadcast information (S12).
- the LTE-A terminal 40a selects, as a RACH preamble transmission destination carrier, an uplink carrier that is a pair of carriers whose highest priority is indicated by the priority information during RACH preamble transmission.
- the LTE-A terminal 40a creates a RACH preamble message using the RACH related parameters for the selected carrier and transmits it to the base station 10a (S14).
- the priority “4” is obtained by referring to the table (FIG. 5).
- the shared carrier B has a reference number “2”, and thus the priority “3”.
- the dedicated carrier has a priority “5” because the reference number is “7”. Since the priority of the dedicated carrier is the highest, the uplink carrier that is a pair of dedicated carriers is selected as the RACH preamble transmission destination carrier, and the RACH preamble is transmitted (S14). Thereafter, as in the first embodiment, a procedure for connection with the base station 10a is executed (S16 to S22).
- the LTE-A terminal 40a When the RACH procedure and the connection setup procedure are successful, the LTE-A terminal 40a establishes a connection with the base station 10a in the dedicated carrier (S24), and after setting the RRC (S26, S28), transmits and receives data (S30). .
- the LTE-A terminal 40a receives the RRC connection release message from the base station 10a (S32) and changes from the connected state to the idle state again (S34). At this time, if the terminal-specific priority information is included in the RRC connection release message, the priority information acquired by the broadcast information at the time of idle is overwritten.
- the LTE-A terminal 40a extracts priority information for idle terminals from priority information instructed by the base station 10a by broadcast information or an RRC connection release message, selects a high priority frequency, and camps.
- the shared carrier A has a reference number “3” and therefore has a priority “4”.
- the shared carrier B has a reference number “2” and has a priority “3”. Since the priority of the shared carrier A is higher, the LTE-A terminal 40a selects the shared carrier A and camps.
- FIG. 7 is a diagram illustrating a configuration of the base station 10a according to the second embodiment.
- the base station 10 a includes a priority information generation unit 12, a broadcast information creation unit 20, a terminal individual information creation unit 22, a transmission unit 24, a reception unit 26, and a RACH processing unit 28.
- the priority information generation unit 12 includes an LTE terminal priority setting unit 14 and an LTE-A terminal priority setting unit 32 that give priority information for LTE terminals.
- the priority information generation unit 12 outputs priority information indicating the priority for each terminal to the broadcast information creation unit 20 and the terminal individual information creation unit 22.
- a priority information table storage unit 34 is connected to the LTE-A terminal priority setting unit 32.
- the priority information table storage unit 34 stores the table described with reference to FIG.
- the LTE-A terminal priority setting unit 32 reads out the table from the priority information table storage unit 34, and selects the combination of priority for idle terminal and connected terminal stored in the table, so that LTE-A Priorities for the terminal 40a are set.
- FIG. 8 is a diagram illustrating a configuration of the LTE-A terminal 40a according to the second embodiment.
- the LTE-A terminal 40 a includes a reception unit 44, a transmission unit 46, a terminal individual information acquisition unit 50, a broadcast information acquisition unit 48, a priority information determination unit 52, a frequency selection unit 54, and a RACH preamble creation unit 56.
- the receiving unit 44 receives broadcast information and terminal individual information.
- the broadcast information acquisition unit 48 extracts priority information and RACH related information from the broadcast information input from the reception unit 44, and outputs the priority information and the RACH related information to the priority information determination unit 52 and the RACH preamble creation unit 56, respectively.
- the terminal individual information acquisition unit 50 extracts priority information from the terminal individual information input from the reception unit 44 and outputs the priority information to the priority information determination unit 52.
- the priority information determination unit 52 includes an LTE-A terminal priority information determination unit 58 and a priority information table storage unit 60.
- the priority information table storage unit 60 stores the table described with reference to FIG.
- the LTE-A terminal priority information determination unit 58 receives a reference number indicating the priority for the LTE-A terminal 40a from the broadcast information acquisition unit 48 and the terminal individual information acquisition unit 50.
- the LTE-A terminal priority information determination unit 58 reads the idle terminal priority and the connected terminal priority corresponding to the input reference number from the table stored in the priority information table storage unit 60.
- the priority information determination unit 52 outputs the idle terminal priority information and the connected terminal priority information to the frequency selection unit 54.
- the frequency selection unit 54 selects the frequency to camp in the idle state according to the determination result input from the priority information determination unit 52. In the connected state, the frequency selection unit 54 selects a RACH preamble transmission destination frequency and outputs information on the selected frequency to the RACH preamble creation unit 56.
- the RACH preamble creation unit 56 selects the RACH preamble parameter to be used from the RACH related information according to the RACH preamble transmission destination frequency information.
- the RACH preamble transmission destination frequency information is input from the frequency selection unit 54, and the RACH related information is input from the broadcast information acquisition unit 48.
- the RACH preamble creation unit 56 creates a RACH preamble message using the RACH preamble parameter and outputs the RACH preamble message to the transmission unit 46.
- the transmission unit 46 transmits the RACH preamble message input from the RACH preamble creation unit 56 from the antenna 42.
- FIG. 9 is a diagram illustrating an operation of the LTE-A terminal 40a according to the second embodiment.
- the basic operation of the LTE-A terminal 40a of the second embodiment is the same as the operation of the LTE-A terminal 40 of the first embodiment.
- the LTE-A terminal 40a receives broadcast information from the base station 10a (S40), and acquires priority information (S41).
- the LTE-A terminal 40a extracts and holds priority information for idle state and connected state from the acquired priority information according to the table shown in FIG. 5 (S42).
- frequency selection is performed as in the LTE-A terminal 40a of the first embodiment (S44 to S62).
- the configuration and operation of the wireless communication system according to the second embodiment have been described above.
- the wireless communication system instructs each priority information by using a table combining the priority information for idle terminals and the priority information for connected terminals.
- the priority information for both the idle terminal and the connected terminal can be indicated by the same number of bits as the priority information for the idle terminal or the priority information for the connected terminal in the first embodiment, and the LTE-A terminal
- the amount of priority information can be reduced.
- priority information for idle terminals and connected terminals is indicated by the same number of bits (3 bits) as the priority information for idle terminals in the first embodiment. The number of bits may be further reduced.
- the priority for the idle state is the same as the priority for the connected state, and with reference numbers 6 to 7, the priority for the idle terminal is “0”. .
- the priority setting in the idle state can be given more freedom than the example shown in FIG.
- the priority for the connected state set for the dedicated carrier as the priority for the connected state Is always combined with a lower priority than the maximum value (in this example, the priority “5” for the reference number 7).
- Reference numbers 5 to 7 have a priority “0” for idle terminals.
- the priority of a dedicated carrier can be set with the highest priority, and a priority with a degree of freedom can be set for a shared carrier.
- the priority for the connected state is “2, 2, 3, 3, 4” with respect to the priority “1 to 5” for the idle state.
- priorities for idle terminals are set at reference numbers 0 to 5 or 0 to 6
- priorities of dedicated carriers are set as priorities for connected terminals. It may be a combination that always has a lower priority than the maximum value.
- the priority “1 to 5” for the idle state is combined with a value different from the ascending order or the descending order as the priority for the connected state.
- the number of combinations can be set as appropriate according to the operation of the system.
- Reference numbers 5 to 7 have a priority “0” for idle terminals.
- the priority for the connected terminal may be appropriately set at reference numbers 0 to 5 or 0 to 6.
- the priority “1 to 5” for the idle state is combined with “5 to 1” as the priority for the connected state.
- Reference numbers 5 to 7 have a priority “0” for idle terminals. Thereby, it is possible to separate the carrier that is prioritized in the idle state and the carrier that is prioritized in the connected state.
- the priority for the connected terminal may be set reverse to the priority for the idle terminal at the reference numbers 0 to 5 or 0 to 6.
- “0” is set as the priority of the dedicated carrier in the priority information for LTE terminals. Since the LTE terminal cannot originally access the dedicated carrier, it is not necessary to set the priority of the dedicated carrier. However, by setting the priority “0” in the priority information for the LTE terminal, the LTE-A Make the terminal recognize the dedicated carrier. Specifically, when the LTE-A terminal 40 selects a frequency for camping in the idle state, both the LTE terminal priority information and the LTE-A terminal priority information are referred to. Do not camp on a carrier whose priority is “0” in the priority information for LTE terminals. By using the priority information for the LTE terminal in this way, the LTE-A terminal 40 can discriminate the frequency priority at the time of idle and connected, so that the information amount of the priority information transmitted on the shared carrier is reduced. it can.
- FIG. 16 is a diagram illustrating signaling operations of the base station 10b and the LTE-A terminal 40b according to the third embodiment.
- the LTE-A terminal 40b is camping on the shared carrier A when in the idle state (S10).
- the LTE-A terminal 40b acquires priority information for the LTE terminal and the LTE-A terminal based on the broadcast information from the base station 10b (S12).
- the LTE-A terminal 40b selects, as a RACH preamble transmission destination carrier, an uplink carrier that is a pair of carriers whose highest priority is indicated in the priority information during RACH preamble transmission, and RACH related parameters for the selected carrier. Is used to create a RACH preamble message and transmit it to the base station 10b (S14).
- the uplink carrier that is a pair of dedicated carriers is selected as the RACH preamble transmission destination carrier, and the RACH preamble is transmitted (S14). Thereafter, as in the first embodiment, a procedure for connection with the base station 10b is executed (S16 to S22). If the RACH procedure is successful, the terminal establishes a connection with the base station 10b in the dedicated carrier (S24), performs RRC settings (S24, S26), and transmits and receives data (S30).
- the LTE-A terminal 40b receives the RRC connection release message from the base station 10b (S32), and changes from the connected state to the idle state again (S34). At this time, if the terminal-specific LTE-A terminal priority information is included in the RRC connection release message, the LTE-A terminal priority information acquired by the broadcast information at the time of idle is used as a new LTE-A terminal priority. Overwrite with degree information.
- the LTE-A terminal 40b selects a high-priority frequency according to the priority information instructed by the broadcast information or the RRC connection release message from the base station 10b, and camps.
- the dedicated carrier is instructed as a high priority frequency, but the priority of the dedicated carrier is “0” in the priority information for the LTE terminal. Accordingly, the LTE-A terminal 40b ignores the priority of the dedicated carrier in the LTE-A terminal priority information, selects the shared carrier A, and camps.
- FIG. 17 is a diagram illustrating a configuration of the base station 10b according to the third embodiment of the present invention.
- the base station 10b includes a priority information generation unit 12, a broadcast information creation unit 20, a terminal individual information creation unit 22, a transmission unit 24, a reception unit 26, and a RACH processing unit 28.
- the priority information generating unit 12 includes an LTE terminal priority setting unit 14 that assigns priority information for LTE terminals, and an LTE-A terminal priority setting unit 36 that assigns priority information for LTE-A terminals 40b. And outputs priority information for each terminal to the broadcast information creation unit 20 and the terminal individual information creation unit 22.
- the notification information creation unit 20 creates notification information including priority information for each terminal output from the priority information generation unit 12 and outputs the notification information to the transmission unit 24.
- the terminal individual information creation unit 22 creates terminal individual information including priority information for each terminal input from the priority information generation unit 12 and outputs the terminal individual information to the transmission unit 24.
- the transmission unit 24 transmits from the antenna 30 the broadcast information input from the broadcast information creation unit 20 and the terminal individual information input from the terminal individual information creation unit 22.
- the receiving unit 26 receives the RACH preamble message from the LTE-A terminal 40b.
- the RACH processing unit 28 processes the RACH preamble message input from the receiving unit 26.
- FIG. 18 is a diagram illustrating a configuration of the LTE-A terminal 40b according to the third embodiment.
- the LTE-A terminal 40 b includes a reception unit 44, a transmission unit 46, a broadcast information acquisition unit 48, a terminal individual information acquisition unit 50, a priority information determination unit 52, a frequency selection unit 54, and a RACH preamble creation unit 56.
- the receiving unit 44 receives broadcast information and terminal individual information.
- the broadcast information acquisition unit 48 extracts priority information and RACH related information from the broadcast information input from the reception unit 44, and outputs the priority information and the RACH related information to the priority information determination unit 52 and the RACH preamble creation unit 56, respectively.
- the terminal individual information acquisition unit 50 extracts priority information from the terminal individual information input from the reception unit 44 and outputs the priority information to the priority information determination unit 52.
- the priority information determination unit 52 includes an LTE terminal priority information acquisition unit 62, an LTE-A terminal priority information acquisition unit 64, an idle terminal priority information determination unit 66, and a connected terminal priority information determination unit 68. Have.
- the LTE terminal priority information acquisition unit 62 acquires the priority information for the LTE terminal input from the broadcast information acquisition unit 48 and outputs the priority information to the idle terminal priority information determination unit 52.
- the LTE terminal priority information acquisition unit 62 acquires the priority information for the LTE-A terminal 40b input from the broadcast information acquisition unit 48 and the terminal individual information acquisition unit 50, and the idle terminal priority information determination unit 66 And output to the connected terminal priority information determination unit 68.
- Priority information for LTE terminals is input to the priority information determination unit 66 for idle terminals from the priority information acquisition unit 62 for LTE terminals.
- the idle terminal priority information determination unit 66 selects the carrier having the priority “0” in the LTE terminal priority information from the LTE-A terminal priority information acquisition unit 64. -Delete from the priority information for the A terminal 40b, determine the frequency priority for the idle terminal, and output the determination result to the frequency selection unit 54.
- the connected terminal priority information determination unit 68 receives priority information for the LTE-A terminal 40b from the LTE-A terminal priority information acquisition unit 64.
- the connected terminal priority information determining unit 68 determines the frequency priority for the connected terminal based on the priority information for the LTE-A terminal 40 b and outputs the determination result to the frequency selecting unit 54.
- the frequency selection unit 54 selects the frequency to camp in the idle state according to the determination result input from the priority information determination unit 52. In the connected state, the frequency selection unit 54 selects a RACH preamble transmission destination frequency and outputs information on the selected frequency to the RACH preamble creation unit 56.
- the RACH preamble creation unit 56 selects the RACH preamble parameter to be used from the RACH related information according to the RACH preamble transmission destination frequency information.
- the RACH preamble transmission destination frequency information is input from the frequency selection unit 54, and the RACH related information is input from the broadcast information acquisition unit 48.
- the RACH preamble creation unit 56 creates a RACH preamble message using the RACH preamble parameters and outputs the RACH preamble message to the transmission unit 46.
- the transmission unit 46 transmits the RACH preamble message input from the RACH preamble creation unit 56 from the antenna 42.
- FIG. 19 is a diagram illustrating an operation of the LTE-A terminal 40b according to the third embodiment.
- the LTE-A terminal 40b receives the broadcast information from the base station 10b (S40), and holds priority information for LTE terminals and LTE-A terminals (S43).
- the LTE-A terminal 40b selects a carrier having a high frequency priority as a RACH preamble transmission destination carrier in the connected state priority information during RACH preamble transmission (S44).
- the LTE-A terminal 40b selects the RACH preamble parameter corresponding to the selected carrier from the RACH related parameters acquired in the broadcast information (S46), and creates a RACH preamble message (S48).
- the created RACH preamble message is transmitted to the RACH preamble transmission destination carrier selected by the priority information (S50).
- the LTE-A terminal 40b transmits and receives data (S54).
- the LTE-A terminal 40b determines whether or not priority information for each terminal is instructed therein (S58). When the priority information for each terminal is instructed (YES in S58), the LTE-A terminal 40b overwrites the retained priority information for LTE-A terminal with the new priority information (S60). .
- the LTE-A terminal 40b When the LTE-A terminal 40b changes from the connected state to the idle state, the LTE-A terminal 40b deletes, from the LTE-A terminal priority information, the carrier having the priority “0” in the LTE terminal priority information. (S61), the frequency to camp is selected according to the priority information (S62).
- the priority of the dedicated carrier is indicated as “0” in the priority information for the LTE terminal.
- the LTE-A terminal 40b can determine the frequency priority at the time of idle and connected by using the priority information for the LTE terminal, thereby reducing the information amount of the priority information transmitted on the shared carrier. .
- the priority information is used for weighting at the time of selecting a RACH preamble parameter transmitted by the RACH transmission carrier and broadcast information. If the LTE-A terminal 40 always selects a carrier with a high priority, there is a problem that RACH preamble transmission of the LTE-A terminal 40 is concentrated on a specific carrier. By weighting the selection of the RACH transmission carrier, concentration of RACH preamble transmission to a specific carrier can be avoided.
- the base station used in the fourth embodiment is the same as the base station 10a shown in FIG. Also, the signaling operation of the LTE-A terminal 40c and the base station 10a of the fourth embodiment is the same as the operation shown in FIG.
- FIG. 20 is a diagram illustrating a configuration of the LTE-A terminal 40c according to the fourth embodiment.
- the LTE-A terminal 40 c includes a reception unit 44, a transmission unit 46, a broadcast information acquisition unit 48, a terminal individual information acquisition unit 50, a priority information determination unit 52, a frequency selection unit 54, and a RACH preamble creation unit 56.
- the receiving unit 44 receives broadcast information and terminal individual information transmitted from the base station 10a.
- the broadcast information acquisition unit 48 extracts priority information and RACH related information from the broadcast information input from the reception unit 44, and outputs the priority information and the RACH related information to the priority information determination unit 52 and the RACH preamble creation unit 56, respectively.
- the terminal individual information acquisition unit 50 extracts priority information from the terminal individual information input from the reception unit 44 and outputs the priority information to the priority information determination unit 52.
- the priority information determination unit 52 acquires priority information for the LTE-A terminal 40c input from the broadcast information acquisition unit 48 and the terminal individual information acquisition unit 50.
- the priority information determination unit 52 extracts the idle terminal priority and the connected terminal priority corresponding to the priority information from the table stored in the priority information table storage unit 60.
- the priority information determination unit 52 outputs the idle terminal priority and the connected terminal priority to the frequency selection unit 54.
- the frequency selection unit 54 includes a camp frequency selection unit 70 and a RACH preamble transmission frequency selection unit 72.
- the camping frequency selection unit 70 selects a frequency for camping in the idle state according to the determination result input from the priority information determination unit 52.
- the RACH preamble transmission frequency selection unit 72 selects a frequency for transmitting the RACH preamble according to the determination result input from the priority information determination unit 52 when changing from the idle state to the connected state.
- the RACH preamble transmission frequency selection unit 72 outputs information on the selected RACH preamble transmission destination frequency to the RACH preamble creation unit 56.
- the RACH preamble creation unit 56 selects a RACH preamble parameter to be used from the RACH related information input from the broadcast information acquisition unit 48 according to the RACH preamble transmission destination frequency information input from the RACH preamble transmission frequency selection unit 54.
- information on the RACH preamble transmission destination frequency is input from the RACH preamble transmission frequency selection unit 54
- RACH related information is input from the broadcast information acquisition unit 48.
- the RACH preamble creation unit 56 creates a RACH preamble message using the RACH preamble parameter and outputs the RACH preamble message to the transmission unit 46.
- the transmission unit 46 transmits the RACH preamble message input from the RACH preamble creation unit 56 from the antenna 42.
- the reception quality of each carrier may be taken into consideration based on the priority information for the connected terminal. For example, the reception quality of the carrier with priority “5” is compared with the reception quality of the carrier with “4”. If it exceeds the predetermined value, the carrier with the priority “4” is selected as the RACH preamble transmission destination.
- the default value for determining the reception quality is a known value of the LTE-A terminal 40c, or a value notified from the base station 10a or notified individually to the LTE-A terminal 40c.
- the first transmission selects the carrier with the highest priority, but if it fails, the carrier with the highest priority is compared with the carrier with the next highest priority. Based on the difference, there is a method for determining whether to transmit the RACH preamble again to the highest priority carrier or to transmit the RACH preamble to the next highest priority carrier. For example, when the priority of the carrier with the highest priority is “5” and the priority of the carrier with the next highest priority is “4”, RACH preamble transmission to the carrier with the priority “5” is performed. When it fails, the RACH preamble is transmitted to the carrier with the next priority “4”.
- the frequency priority value for the probability calculation for selecting the value of the RACH preamble assigned to each carrier. For example, it is assumed that there is a frequency A having a priority “5”, a frequency B having a priority “4”, and a frequency C having a priority “2”.
- the probability that the RACH preamble assigned to each carrier is selected may be calculated as frequency A is 5 / (5 + 4 + 2), frequency B is 4 / (5 + 4 + 2), and frequency C is 2 / (5 + 4 + 2).
- the transmission destination of the RACH preamble is the frequency A.
- FIG. 21 is a diagram showing an operation of the LTE-A terminal 40c in the fourth embodiment.
- the selection of the RACH preamble transmission destination carrier is performed in consideration of the reception quality of each carrier.
- the LTE-A terminal 40c receives broadcast information from the base station 10a (S40) and acquires priority information (SS41).
- the LTE-A terminal 40c extracts and holds priority information for idle state and connected state from the acquired priority information according to the table of FIG. 5 (S42).
- the LTE-A terminal 40c selects the carrier having the highest frequency priority in the connected state priority information during RACH preamble transmission (S44). When the reception quality of the selected carrier exceeds the predetermined value (YES in S64), the LTE-A terminal 40c determines that carrier as the RACH preamble transmission destination carrier (S66).
- the LTE-A terminal 40c selects the carrier with the next highest frequency priority (S74) and determines the reception quality. If the reception quality of the selected carrier exceeds the predetermined value (YES in S64), the LTE-A terminal 40c creates a RACH preamble parameter corresponding to the carrier selected as the RACH preamble transmission destination. Specifically, the LTE-A terminal 40c selects from the RACH related parameters acquired by the broadcast information (S66), and creates a RACH preamble message (S68). The LTE-A terminal 40c transmits the created RACH preamble message toward the RACH preamble transmission destination carrier selected by the priority information and the reception quality (S70). If the RACH procedure is successful (YES in S72), the LTE-A terminal 40c establishes a connection with the base station 10a in the selected carrier (S76), and transmits and receives data (S78).
- the LTE-A terminal 40c selects the next highest priority carrier from the connected state priority information (S74), and whether the reception quality exceeds a predetermined value. Whether or not is determined (S64), and the same processing as described above is performed.
- S74 the next carrier is selected when the RACH procedure fails once. However, when the RACH procedure fails a plurality of times, the next carrier may be selected.
- the configuration and operation of the wireless communication system according to the fourth embodiment have been described above.
- concentration of RACH preamble transmission to a specific carrier can be avoided by using priority information for weighting selection of RACH transmission carrier and RACH preamble parameter.
- the RACH related parameters used for generating the RACH preamble message may be common among the carriers under the management of the base station 10.
- the present invention has the priority of the frequency for each of the connected state and the idle state as the priority information, so that the LTE-Advanced terminal can camp on to an appropriate frequency, and the wireless communication corresponding to LTE-Advanced It is useful as a system.
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Abstract
Description
第1の実施の形態では、アイドル状態にあるLTE-A端末(以下、「アイドル端末」という)40のための優先度情報と、コネクテッド状態にあるLTE-A端末(以下、「コネクテッド端末」という)40のための優先度情報とを別個に設定し、報知情報に含める。これによって、接続プロシジャのみでLTE-A端末40を専用キャリアに接続することを可能にする。
第2の実施の形態では、基地局とLTE-A端末は、アイドル端末用優先度情報とコネクテッド端末用優先度情報との組み合わせを記録した共通のテーブルを有している。基地局は、この共通のテーブルに規定された参照番号によって、アイドル端末用優先度情報とコネクテッド端末用優先度情報を指定する。これによって、LTE-A端末用の優先度情報の情報量を削減できる。
第3の実施の形態では、LTE端末用の優先度情報において専用キャリアの優先度として「0」を設定する。LTE端末は、もともと専用キャリアにアクセスすることはできないので、専用キャリアの優先度を設定する必要はないが、LTE端末用の優先度情報に優先度「0」を設定することにより、LTE-A端末に対して専用キャリアを認識させる。具体的には、LTE-A端末40がアイドル状態においてキャンプする周波数を選択する時に、LTE端末用優先度情報とLTE-A端末用優先度情報の両方を参照する。LTE端末用の優先度情報で優先度が「0」であるキャリアにキャンプオンしないようにする。このようにLTE端末用の優先度情報を利用することにより、LTE-A端末40は、アイドル時とコネクテッド時の周波数優先度を判別できるので、共用キャリアで送信する優先度情報の情報量を削減できる。
第4の実施の形態では、優先度情報を、RACH送信キャリア及び報知情報で送られるRACHプリアンブルパラメータの選択時の重み付けに利用する。LTE-A端末40が必ず優先度の高いキャリアを選択してしまうと、LTE-A端末40のRACHプリアンブル送信が特定キャリアに集中してしまうという問題が起こる。RACH送信キャリアの選択に重み付けを行うことで、特定キャリアへのRACHプリアンブル送信集中を回避することができる。
12 優先度情報生成部
14 LTE端末用優先度設定部
16 アイドル端末用優先度設定部
18 コネクテッド端末用優先度設定部
20 報知情報作成部
22 端末個別情報作成部
24 送信部
26 受信部
28 RACH処理部
30 アンテナ
32 LTE-A端末用優先度設定部
34 優先度情報テーブル記憶部
36 LTE-A端末用優先度設定部
40 LTE-A端末
42 アンテナ
44 受信部
46 送信部
48 報知情報取得部
50 端末個別情報取得部
52 優先度情報判定部
54 周波数選択部
56 RACHプリアンブル作成部
58 LTE-A端末用優先度情報判定部
60 優先度情報テーブル記憶部
62 LTE端末用優先度情報取得部
64 LTE-A端末用優先度情報取得部
66 アイドル端末用優先度情報判定部
68 コネクテッド端末用優先度情報判定部
70 キャンプ周波数選択部
72 RACHプリアンブル送信周波数選択部
Claims (14)
- 複数の周波数のうちの一部の専用周波数によってコネクテッド状態のLTE-Advanced端末とのみ通信し、残りの共用周波数によってLTE端末およびLTE-Advanced端末と通信する無線送受信装置であって、
コネクテッド状態にあるLTE-Advanced端末向けに前記複数の周波数のそれぞれの優先度を設定すると共に、アイドル状態にあるLTE-Advanced端末向けに前記共用周波数のそれぞれの優先度を設定し、設定した優先度を示す優先度情報を生成する優先度情報生成部と、
前記優先度情報を含む報知情報を作成する報知情報作成部と、
前記報知情報を送信する送信部と、
を備える無線送受信装置。 - 前記優先度情報を含む端末個別情報を作成する端末個別情報作成部を備え、
前記送信部は、前記端末個別情報を送信する請求項1に記載の無線送受信装置。 - アイドル状態にあるLTE-Advanced端末向けの優先度とコネクテッド状態にあるLTE-Advanced端末向けの優先度の組み合わせを参照番号に関連付けて記憶したテーブルを有し、
前記優先度情報生成部は、前記複数の周波数のそれぞれについて前記テーブルに記憶された組み合わせの中からアイドル状態とコネクテッド状態における優先度の組み合わせを選択し、その組み合わせにかかる参照番号を当該周波数の優先度として設定する請求項1または2に記載の無線送受信装置。 - 前記優先度情報生成部は、
LTE-A端末向けに前記複数の周波数のそれぞれの優先度を設定するLTE-A端末用優先度設定部と、
LTE端末向けに前記共用周波数のそれぞれの優先度を設定するLTE端末用優先度設定部と、を有し、
前記LTE-A端末用優先度設定部は、コネクテッド状態にあるLTE-A端末向けに各周波数の優先度を設定し、
前記LTE端末用優先度設定部は、前記専用周波数に対して選択不可を示す優先度を設定する請求項1または2に記載の無線送受信装置。 - 請求項1~4のいずれかに記載の無線送受信装置を有する無線基地局。
- 複数の周波数によって通信可能な無線送受信装置であって、
報知情報を受信する受信部と、
前記報知情報から抽出した周波数の優先度であって、アイドル状態における優先度とコネクテッド状態における優先度とを判定する優先度判定部と、
前記アイドル状態における優先度に基づいてアイドル時にキャンプする周波数を選択するキャンプ周波数選択部と、
前記コネクテッド状態における優先度に基づいてRACHプリアンブルの送信先周波数を選択する送信周波数選択部と、
前記送信周波数選択部にて選択した周波数にてRACHプリアンブルを送信するRACHプリアンブル送信部と、
を備える無線送受信装置。 - 前記受信部は、基地局より送信される端末個別情報を受信し、
前記優先度判定部は、前記端末個別情報から抽出した周波数の優先度情報を判定する請求項6に記載の無線送受信装置。 - アイドル状態における優先度とコネクテッド状態における優先度の組み合わせを参照番号に関連付けて記憶したテーブルを有し、
前記報知情報には、前記参照番号が優先度情報として含まれており、
前記優先度判定部は、前記参照番号に対応するアイドル状態とコネクテッド状態のそれぞれの優先度を前記テーブルから読み出す請求項6または7に記載の無線送受信装置。 - 前記報知情報には、LTE-Advanced端末用の優先度とLTE端末の優先度とが含まれており、前記LTE端末の優先度において前記専用周波数に対して選択不可を示す優先度が設定され、
前記優先度判定部は、前記LTE-Advanced端末用の優先度に基づいてコネクテッド状態における優先度を判定し、前記LTE端末用の選択不可を示す優先度から前記専用周波数を特定し、前記LTE-Advanced端末用の優先度から前記専用周波数を除いてアイドル状態における優先度を判定する請求項6または7に記載の無線送受信装置。 - 前記RACHプリアンブル送信部におけるRACHプリアンブルの送信に失敗した場合に、前記送信周波数選択部は、前記優先度に基づいてRACHプリアンブルを送信する送信先周波数を再度選択する請求項6~9のいずれかに記載の無線送受信装置。
- 請求項6~10のいずれかに記載の無線送受信装置を備える無線端末。
- 複数の周波数のうちの一部の専用周波数によってコネクテッド状態のLTE-Advanced端末とのみ通信し、残りの共用周波数によってLTE端末およびLTE-Advanced端末と通信する無線基地局と、LTE-Advanced端末とを有する無線通信システムであって、
前記無線基地局は、
アイドル状態にあるLTE-Advanced端末向けに前記共用周波数のそれぞれの優先度を設定すると共に、コネクテッド状態にあるLTE-Advanced端末向けに前記複数の周波数のそれぞれの優先度を設定し、設定した優先度を示す優先度情報を生成する優先度情報生成部と、
前記優先度情報を含んだ報知情報を作成する報知情報作成部と、
前記報知情報を送信する送信部と、
を備え、
前記LTE-Advanced端末は、
報知情報を受信する受信部と、
前記報知情報から抽出した周波数の優先度であって、アイドル状態における優先度とコネクテッド状態における優先度とを判定する優先度判定部と、
前記アイドル状態における優先度に基づいてアイドル時にキャンプする周波数を選択するキャンプ周波数選択部と、
前記コネクテッド状態における優先度に基づいてRACHプリアンブルの送信先周波数を選択する送信周波数選択部と、
前記送信周波数選択部にて選択した周波数にてRACHプリアンブルを送信するRACHプリアンブル送信部と、
を備える無線通信システム。 - 複数の周波数のうちの一部の専用周波数によってコネクテッド状態のLTE-Advanced端末とのみ通信し、残りの共用周波数によってLTE端末およびLTE-Advanced端末と通信する無線送受信装置による優先度通知方法であって、
前記無線送受信装置が、コネクテッド状態にあるLTE-Advanced端末向けに前記複数の周波数のそれぞれの優先度を設定すると共に、アイドル状態にあるLTE-Advanced端末向けに前記共用周波数のそれぞれの優先度を設定し、設定した優先度を示す優先度情報を生成するステップと、
前記無線送受信装置が、前記優先度情報を含む報知情報を作成するステップと、
前記無線送受信装置が、前記報知情報を送信するステップと、
を備える優先度通知方法。 - 複数の周波数によって通信可能なLTE-Advanced端末による周波数選択方法であって、
前記LTE-Advanced端末が報知情報を受信するステップと、
前記LTE-Advanced端末が、前記報知情報から抽出した周波数の優先度であって、アイドル状態における優先度とコネクテッド状態における優先度とを判定するステップと、
前記LTE-Advanced端末が、前記アイドル状態における優先度に基づいてアイドル時にキャンプする周波数を選択するステップと、
前記LTE-Advanced端末が、前記コネクテッド状態における優先度に基づいてRACHプリアンブルの送信先周波数を選択するステップと、
前記LTE-Advanced端末が、選択した周波数にてRACHプリアンブルを送信するステップと、
を備える周波数選択方法。
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JP2018518850A (ja) * | 2016-03-30 | 2018-07-12 | ベイジン シャオミ モバイル ソフトウェア カンパニーリミテッド | セル再選択過程において隣接セルを検出する方法及び装置 |
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US20140106749A1 (en) * | 2012-10-12 | 2014-04-17 | Nokia Siemens Networks Oy | Method, apparatus, computer program product, computer readable medium and system for cell reselection |
WO2014126569A1 (en) * | 2013-02-14 | 2014-08-21 | Nokia Solutions And Networks Oy | Antenna selection in coordinated multipoint communications |
US10117244B2 (en) * | 2013-02-28 | 2018-10-30 | Nokia Solutions And Networks Oy | Uplink carrier selection for reduced bandwidth machine type communication devices |
EP3820229A4 (en) * | 2018-07-26 | 2021-07-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | METHOD AND DEVICE FOR RESOURCE CONFIGURATION, TERMINAL DEVICE AND NETWORK DEVICE |
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JP2007129588A (ja) * | 2005-11-04 | 2007-05-24 | Ntt Docomo Inc | キャリア方法通知方法、周辺セル測定方法、基地局装置および移動局装置 |
WO2009025241A1 (ja) * | 2007-08-17 | 2009-02-26 | Ntt Docomo, Inc. | ユーザ装置及び無線通信システム |
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WO2006034578A1 (en) * | 2004-09-29 | 2006-04-06 | Nortel Networks Limited | Method and system for capacity and coverage enhancement in wireless networks with relays |
US20100113041A1 (en) * | 2008-10-31 | 2010-05-06 | Maik Bienas | Method of signalling system information, method of receiving system information, radio base station and radio communication terminal |
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JP2007129588A (ja) * | 2005-11-04 | 2007-05-24 | Ntt Docomo Inc | キャリア方法通知方法、周辺セル測定方法、基地局装置および移動局装置 |
WO2009025241A1 (ja) * | 2007-08-17 | 2009-02-26 | Ntt Docomo, Inc. | ユーザ装置及び無線通信システム |
Cited By (2)
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JP2018518850A (ja) * | 2016-03-30 | 2018-07-12 | ベイジン シャオミ モバイル ソフトウェア カンパニーリミテッド | セル再選択過程において隣接セルを検出する方法及び装置 |
US10051535B2 (en) | 2016-03-30 | 2018-08-14 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and device for detecting neighboring cell in cell reselection process |
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US20110317654A1 (en) | 2011-12-29 |
JPWO2010103750A1 (ja) | 2012-09-13 |
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