WO2009157124A1 - 無線基地局装置、無線中継局装置、及び無線端末装置 - Google Patents
無線基地局装置、無線中継局装置、及び無線端末装置 Download PDFInfo
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- WO2009157124A1 WO2009157124A1 PCT/JP2009/002027 JP2009002027W WO2009157124A1 WO 2009157124 A1 WO2009157124 A1 WO 2009157124A1 JP 2009002027 W JP2009002027 W JP 2009002027W WO 2009157124 A1 WO2009157124 A1 WO 2009157124A1
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- random access
- radio
- base station
- station apparatus
- relay station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the present invention relates to a radio communication system including a radio base station apparatus (e Node B), a radio relay station apparatus (also called a Relay Node: Relay Station, Repeater, etc.), and a radio terminal apparatus (UE).
- a radio base station apparatus e Node B
- a radio relay station apparatus also called a Relay Node: Relay Station, Repeater, etc.
- UE radio terminal apparatus
- the present invention relates to a wireless communication system that can reduce the latency when establishing a communication connection and reduce the time until the wireless terminal device starts communication.
- 3GPP which is a mobile communication technology standardization organization, standardizes a mobile communication technology called LTE (Long Term Evolution), which realizes a data rate of over 100 Mbps.
- LTE Long Term Evolution
- a random access channel (RACH: Random Access) is established to establish a connection with the wireless communication base station apparatus.
- RACH Random Access
- the random access procedure is composed of four messages as shown in FIG.
- a random access preamble signal (hereinafter referred to as “RACH preamble signal”: also referred to as Message 1 in this specification) and a random access response signal (hereinafter referred to as “RACH response signal”: also referred to as Message 2 in this specification) are MAC (Media Access). Control) layer signal.
- An RRC connection request signal (RRC Connection Request: also referred to as Message 3 in this specification) and an RRC connection setting signal (RRC Connection Set up: also referred to as Message 4 in this specification) are signals in the RRC (Radio Access Control) layer.
- the radio terminal selects the cell with the best received signal level (best cell) and accesses the selected cell. Since the wireless terminal is moving during the random access procedure, the received signal level of the cell to which connection is being attempted is constantly changing. Therefore, there is a possibility of switching cells during random access.
- FIG. 24 is a diagram illustrating a sequence for performing cell reselection during a random access procedure in the current LTE. Even after transmitting the RACH preamble signal to the radio base station apparatus 100a of the first cell, the radio terminal apparatus 110 continues to detect the received signal levels of the first cell and the second cell adjacent thereto. Here, the detection of the received signal level is referred to as cell reselection evaluation.
- the radio terminal device 110 transmits a RACH preamble signal to the radio base station device 100b of the second cell after the RRC connection failure.
- the radio terminal device 110 In order to transmit the RACH preamble signal again in the second cell of the movement destination, the radio terminal device 110 must acquire parameters necessary for the RACH preamble signal. Parameters necessary for the RACH preamble signal are included in broadcast information (System Information) that is periodically broadcast from the radio base station apparatus (eNode B) 100b.
- broadcast information is information that broadcasts parameters used in each cell.
- the radio terminal apparatus 110 that has performed cell reselection needs to receive broadcast information in order to acquire a preamble parameter used in a new cell.
- the preamble parameters are reported in SIB2 (System Information Block 2), and the period is 160 ms (3GPP Specification TS36.331 v8.1.0, “Evolved Universal Terrestrial Radio” Access (E-UTRA) Radio Resource Control (RRC) Protocol Specification ”. That is, the radio terminal apparatus 110 that has performed cell reselection has a delay of 160 ms at maximum before transmitting the RACH preamble signal, and greatly increases the latency until the connection is established.
- IMT-Advanced As a next-generation cellular communication system, IMT-Advanced system has been studied.
- the frequency band of the IMT-Advanced system is also assigned a higher frequency band (3.4 to 3.6 GHz) than the current system.
- the cell radius decreases as the frequency of use increases. Accordingly, in IMT-Advanced, it is considered to arrange the radio relay station apparatus 120 at the cell edge of the radio base station apparatus 100 as shown in FIG. 25 in order to improve cell edge performance and expand cell coverage. Yes.
- next-generation cellular communication network in which such a radio relay station device 120 is arranged, the cell density becomes high, so the frequency of cell reselection during the random access procedure described above increases, and as a result, the latency at the time of establishing a connection is increased.
- Increasing cases are expected (IEEE P802.16j / D1 (March 2007) "Part 16: Interface for Fixed and Mobile Broadband Wireless Access Systems", IST-4-027756 WINNER II, D3.5.1 v1.0 " Relaying concepts and supporting actions in the context of CGs ”).
- the radio relay station apparatus 120 As described above, in the cellular communication system in which the radio relay station apparatus 120 is introduced, it is predicted that the frequency of cell reselection during the random access procedure increases, and in turn, the case where the latency at the time of establishing a connection is increased increases.
- the present invention has been made in view of the above points, and a radio base station apparatus that reduces latency at the time of establishing a connection that occurs when a conventional random access procedure is applied to a cellular radio system in which a radio relay station apparatus is introduced
- An object of the present invention is to provide a radio relay station apparatus and a radio terminal apparatus.
- the radio base station apparatus, radio relay station apparatus, and radio terminal apparatus of the present invention include a radio base station apparatus (eNode B) that controls communication with a radio terminal apparatus (User Equipment), the radio base station apparatus, and the radio terminal
- a radio base station apparatus eNode B
- a radio terminal apparatus User Equipment
- the radio base station apparatus User Equipment
- the radio terminal User Equipment
- the present invention is applied to a radio communication system having a radio relay station device (Relay Node) that relays communication with the device.
- Relay Node radio relay station device
- the radio base station apparatus of the present invention includes a preamble signal receiving unit that receives a RACH preamble signal transmitted from the radio terminal apparatus, and a reception notification indicating that the radio relay station apparatus has received the RACH preamble signal.
- a reception notification receiving unit that receives from the relay station device, a random access identifier (RA-ID) of the RACH preamble signal transmitted from the wireless terminal device, and a random access included in the reception notification transmitted from the wireless relay station device When the identifiers match, the wireless relay station device is permitted to use the random access identifier, and includes a cell identifier (Cell ID) of a cell managed by the wireless relay station device that is permitted to use the random access identifier.
- the radio relay station apparatus of the present invention includes a preamble signal receiving unit that receives a RACH preamble signal transmitted from the radio terminal apparatus to the radio base station apparatus, and a notification indicating reception of the RACH preamble signal.
- a reception notification transmission unit that transmits a reception notification including a random access identifier of the RACH preamble signal to the radio base station device and the use of the random access identifier included in the RACH preamble signal are permitted from the radio base station device.
- a permission identifier storage unit that stores a random access identifier included in the RACH response signal; and a random access identifier stored in the RACH preamble signal and the random access identifier stored in the permission identifier storage unit when the RACH preamble signal is received.
- One identifier A random access identifier determination unit that determines whether or not to perform, and a response signal transmission unit that transmits a RACH response signal for the RACH preamble signal to the wireless terminal device when it is determined that the random access identifier determination unit matches the random access identifier determination unit With.
- the radio terminal apparatus of the present invention receives a RRC connection request when a preamble signal transmission unit that transmits a RACH preamble signal and the RACH response signal transmitted from the radio base station apparatus according to the RACH preamble signal are received.
- An RRC control unit that transmits to the radio base station device; and a best cell search unit that searches for a best cell with the best reception quality when an RRC connection by the RRC connection request fails, and the preamble signal transmission unit includes: When the cell identifier of the best cell matches the cell identifier included in the RACH response signal, a RACH preamble signal including a random access identifier included in the RACH response signal is transmitted to the radio relay station apparatus.
- FIG. 1 is a diagram illustrating a configuration of a radio base station apparatus according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration of the radio relay station apparatus according to the first embodiment.
- FIG. 3 is a diagram illustrating the wireless terminal device according to the first embodiment.
- FIG. 4 is a sequence diagram showing a random access procedure in the first embodiment.
- FIG. 5 is a diagram illustrating an example in which different sequence subgroups are allocated in adjacent cells.
- FIG. 6 is a diagram illustrating a time lapse from the RACH preamble signal reception to the RACH response signal transmission in the radio base station apparatus.
- FIG. 7 is a diagram illustrating another example in which the radio relay station apparatus acquires information on permission to use a sequence.
- FIG. 1 is a diagram illustrating a configuration of a radio base station apparatus according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration of the radio relay station apparatus according to the first embodiment.
- FIG. 3 is a diagram illustrating the
- FIG. 8 is a diagram illustrating a transmission range of the RACH preamble signal in the radio base station apparatus as well.
- FIG. 9 is a diagram for explaining the background of the second embodiment.
- FIG. 10 is a sequence diagram illustrating a random access procedure according to the second embodiment.
- FIG. 11 is a diagram illustrating a configuration of a radio relay station apparatus according to the third embodiment.
- FIG. 12 is a sequence diagram showing a random access procedure according to the third embodiment.
- FIG. 13 is a diagram illustrating an example in which another wireless terminal device connected to the wireless base station device transmits a RACH preamble signal.
- FIG. 14 is a diagram illustrating a configuration of a radio relay station apparatus according to the fourth embodiment.
- FIG. 15 is a sequence diagram illustrating a random access procedure according to the fourth embodiment.
- FIG. 16 is a diagram illustrating a RACH response signal transmission method of the radio base station apparatus and the radio relay station apparatus.
- FIG. 17 is a diagram illustrating a RACH response signal transmission method of the radio base station apparatus and the radio relay station apparatus.
- FIG. 18 is a diagram illustrating a reception time window of the RACH response signal of the wireless terminal device.
- FIG. 19 is a diagram illustrating a configuration of a radio relay station apparatus according to the fifth embodiment.
- FIG. 20 is a sequence diagram illustrating a random access procedure according to the fifth embodiment.
- FIG. 21 is a diagram illustrating a configuration of a radio base station apparatus according to the sixth embodiment.
- FIG. 22 is a sequence diagram showing a random access procedure according to the sixth embodiment.
- FIG. 23 is a sequence diagram showing a conventional random access procedure.
- FIG. 24 is a diagram showing a sequence for performing cell reselection during a random access procedure.
- FIG. 25 is a diagram showing the arrangement of radio relay station apparatuses
- the radio base station apparatus, radio relay station apparatus, and radio terminal apparatus include a radio base station apparatus (eNode B) that controls communication with a radio terminal apparatus (User Equipment), a radio base station apparatus, and a radio terminal.
- eNode B radio base station apparatus
- the present invention is applied to a radio communication system having a radio relay station device (Relay Node) that relays communication with the device.
- Relay Node radio relay station device
- the radio relay station apparatus includes a preamble signal receiving unit that receives a RACH preamble signal transmitted from the radio terminal apparatus to the radio base station apparatus, and a notification indicating reception of the RACH preamble signal, and random access of the RACH preamble signal.
- a reception notification transmission unit that transmits a reception notification including the identifier to the radio base station apparatus.
- the radio base station apparatus transmits a preamble signal receiver that receives a RACH preamble signal transmitted from the radio terminal apparatus, a reception notification receiver that receives a reception notification transmitted from the radio relay station apparatus, and is transmitted from the radio terminal apparatus.
- a reception notification receiver that receives a reception notification transmitted from the radio relay station apparatus
- the radio relay station device is allowed to use the random access identifier
- a response signal transmission unit configured to transmit a RACH response signal including a cell identifier (Cell ID) of a cell managed by a wireless relay station device permitted to use a random access identifier to the wireless terminal device.
- the radio base station apparatus compares the random access identifier and receives it. It is determined whether the RACH preamble signal matches the RACH preamble signal received by the radio base station apparatus. When it is determined that the RACH preamble signals match, it is determined that the wireless terminal device is in a position where it can communicate with the wireless relay station device, and thus the wireless relay station device is allowed to use a random access identifier. .
- the radio relay station apparatus includes a permission identifier storage unit that stores a random access identifier included in the RACH response signal when the use of a random access identifier included in the RACH preamble signal is permitted by the radio base station apparatus. .
- the radio terminal apparatus receives the RACH response signal transmitted from the radio base station apparatus, the RRC control unit that transmits the RRC connection request to the radio base station apparatus, and when the RRC connection by the RRC connection request fails, A best cell search unit for searching for the best cell with the best reception quality, and a RACH preamble signal including a random access identifier included in the RACH response signal when the cell identifier of the best cell matches the cell identifier included in the RACH response signal.
- a preamble signal transmission unit for transmitting to the radio relay station device. Further, when the radio relay station apparatus receives the RACH preamble signal transmitted from the radio terminal apparatus, whether or not the random access identifier of the RACH preamble signal matches the random access identifier stored in the permission identifier storage unit. A random access identifier determining unit for determining whether or not the random access identifier matches, and a response signal transmitting unit for transmitting a RACH response signal for the RACH preamble signal to the wireless terminal device.
- the RACH preamble signal is transmitted again to the best cell.
- the radio relay station apparatus that manages the best cell is a radio relay station apparatus that is permitted to use the random access identifier of the RACH preamble signal that was previously transmitted to the radio base station apparatus.
- a RACH preamble signal including the random access identifier can be used.
- the RACH preamble signal can be generated without receiving broadcast information transmitted from the best cell, so that latency at the time of establishing a connection can be reduced.
- the radio base station apparatus includes a permission notification transmission unit that transmits a permission notice indicating that the use of the random access identifier is permitted to the radio relay station apparatus.
- the radio relay station apparatus includes a permission notice receiving unit that receives the permission notice from the radio base station apparatus, and assigns a random access identifier included in the permission notice received by the permission notice receiving unit to the permission It has the structure which memorize
- the radio relay station apparatus can know that the use of the random access identifier is permitted.
- the radio relay station apparatus includes a response signal receiving unit that receives a RACH response signal transmitted from the radio base station apparatus to the radio terminal apparatus, and the radio signal is received from the RACH response signal received by the response signal receiving unit.
- the random access identifier included in the RACH response signal is stored in the permission identifier storage unit.
- the radio relay station apparatus can know that the use of the random access identifier is permitted. In this case, permission notification from the radio base station apparatus to the radio relay station apparatus is unnecessary.
- the radio base station apparatus has a configuration of waiting for a preamble reception notification from the radio relay station apparatus until a predetermined time elapses after receiving the RACH preamble signal transmitted from the radio terminal apparatus.
- the radio base station apparatus can appropriately receive a preamble reception notification that may be transmitted from the radio relay station apparatus.
- the radio base station apparatus When the radio base station apparatus according to the present embodiment receives a preamble reception notification including the same random access identifier from a plurality of radio relay station apparatuses, the radio base station apparatus randomly selects a radio relay station apparatus selected from the plurality of radio relay station apparatuses. It has a configuration that permits the use of an access identifier.
- This configuration increases the possibility that a radio relay station device permitted to use a random access identifier will be searched for as the best cell.
- the response signal transmission unit determines whether or not the radio relay station apparatus that is the transmission source of the preamble reception notification is a radio relay station apparatus that is permitted to use the random access identifier. In the case of a wireless relay station device that has been permitted to be used, the RACH response signal is not transmitted to the wireless terminal device.
- the radio relay station apparatus When a radio relay station apparatus that has permitted the use of a random access identifier receives a RACH preamble signal, the radio relay station apparatus transmits a RACH response signal, so that the radio base station apparatus does not transmit a RACH response signal. By doing so, it is possible to prevent the RACH response signal from being redundantly transmitted.
- the random access identifier determination unit determines that the random access identifier of the RACH preamble signal transmitted from the radio terminal apparatus matches the random access identifier stored in the permission identifier storage unit.
- a transmission unit that transmits a notification indicating that the transmission of the RACH response signal to the RACH preamble signal is unnecessary, to the radio base station apparatus.
- the radio base station apparatus receives a notification indicating that transmission of the RACH response signal for the RACH preamble signal is unnecessary from the radio relay station apparatus permitted to use the random access identifier, the radio terminal It has a configuration that does not transmit a RACH response signal to the apparatus.
- the radio relay station apparatus When the radio relay station apparatus that has permitted the use of the random access identifier receives the RACH preamble signal, the radio relay station apparatus transmits a RACH response signal, so that the RACH response is transmitted from the radio relay station apparatus to the radio base station apparatus.
- the radio relay station apparatus transmits a RACH response signal, so that the RACH response is transmitted from the radio relay station apparatus to the radio base station apparatus.
- the response signal transmission unit receives the reference value of the transmission power of the RACH preamble signal defined in the radio relay station apparatus that permits the use of the random access identifier, and the radio relay station apparatus. It has the structure which transmits the RACH response signal containing the transmission power (RSTP: Reference symbol Transmission power) of the pilot signal transmitted. Further, in the radio terminal apparatus according to the present embodiment, the preamble signal transmission unit receives the radio relay station apparatus based on the transmission power reference value of the RACH preamble signal included in the RACH response signal and the transmission power of the pilot signal. It has a configuration in which a RACH preamble signal is transmitted with transmission power that can be received but cannot be received by the radio base station apparatus.
- the random access identifier determination unit determines that the random access identifier of the RACH preamble signal transmitted from the radio terminal apparatus matches the random access identifier stored in the permission identifier storage unit.
- a response signal monitoring unit that monitors whether or not a RACH response signal for the RACH preamble signal is transmitted from the radio base station apparatus to the radio terminal apparatus. When the RACH response signal is not transmitted, the RACH response signal for the RACH preamble signal is transmitted to the wireless terminal device.
- the response signal transmission unit transmits the radio terminal apparatus to the radio relay station apparatus based on the reception level included in the preamble reception notification and the reception characteristics of the radio relay station apparatus.
- a control parameter for controlling the transmission power of the RACH preamble signal to be transmitted is included in the RACH response signal for transmission.
- the preamble signal transmission unit has a transmission power that can be received by the radio relay station apparatus but cannot be received by the radio base station apparatus, based on the control parameter included in the RACH response signal. It has the structure which transmits a RACH preamble signal.
- the radio relay station apparatus includes a reception level detection unit that detects a reception level of a RACH preamble signal, and a random access identifier determination unit and a random access identifier and permission of a RACH preamble signal transmitted from the radio terminal apparatus.
- Response signal monitoring for monitoring whether a RACH response signal for the RACH preamble signal is transmitted from the radio base station apparatus to the radio terminal apparatus when it is determined that the random access identifier stored in the identifier storage unit matches.
- the preamble reception notification transmitter includes the reception level of the RACH preamble signal in the preamble reception notification and transmits it to the radio base station apparatus, and the response signal transmitter does not transmit the RACH response signal within a predetermined time.
- To the RACH preamble signal It has a structure for transmitting a RACH response signal to the wireless terminal device.
- the RACH preamble signal using the random access identifier permitted to be used continuously reaches the radio relay station apparatus but does not reach the radio base station apparatus. Therefore, when the random access identifier permitted to be used is transmitted, the base station knows that it is a RACH preamble signal from another wireless terminal device using the same random access identifier. A response signal can be returned.
- the radio relay station apparatus monitors whether or not a RACH response signal is transmitted from the radio base station apparatus to the radio terminal apparatus. When no RACH response signal is transmitted from the radio base station apparatus, the radio relay station apparatus transmits a RACH response signal to the radio terminal apparatus for the first time. Since it is returned, the RACH response signal is not transmitted to another wireless terminal device that happens to use the same random access identifier.
- the radio base station apparatus permits use of a random access identifier to the radio relay station apparatus when a predetermined time has elapsed after the permission notice is transmitted to the radio relay station apparatus by the permission notice transmission unit.
- a permission end notification transmitter for transmitting a notification indicating the end is provided.
- the radio relay station apparatus receives the permission end notification transmitted from the radio base station apparatus to notify the end of permission to use the random access identifier, the radio relay station apparatus receives the random access identifier corresponding to the permission end notification. It has a configuration for deleting from the permission identifier storage unit.
- FIG. 1 is a diagram illustrating a configuration of a radio base station apparatus 10 according to the first embodiment
- FIG. 2 is a diagram illustrating a configuration of a radio relay station apparatus 30 according to the first embodiment
- FIG. It is a figure which shows the radio
- FIG. 4 is a sequence diagram showing a random access procedure in the first embodiment.
- the random access procedure and the operations of the radio base station apparatus 10, the radio relay station apparatus 30, and the radio terminal apparatus 50 according to the first embodiment will be described with reference to FIGS.
- the wireless terminal device 50 exists in the coverage of the wireless base station device 10 and is in a standby state (idle mode) connected to the wireless base station device 10, and the wireless terminal device 50 receives paging from the network. Then, consider an example of starting communication. Even when the wireless terminal device 50 starts communication, the random access procedure is performed as in the example described below.
- the wireless terminal device 50 when receiving the paging message, transmits a RACH preamble signal in order to establish a channel for data transmission / reception with the wireless base station device 10.
- a cell-specific parameter is used for the RACH preamble signal.
- These parameters include a preamble transmission slot and a preamble transmission power.
- SIB2 System Information Block 2 in LTE to the radio terminal apparatus 50 in the area.
- the radio terminal device 50 receives the broadcast information transmitted from the radio base station device 10 by the broadcast information receiving unit 56.
- the RRC control unit 53 of the wireless terminal device 50 detects a parameter used in the cell and stores it in a random access parameter (RACH Parameter) storage unit 55.
- the MAC control unit 54 that has received the trigger for the random access procedure from the RRC control unit 53 generates a RACH preamble signal using the cell-specified random access parameters.
- the radio terminal device 50 transmits the generated RACH preamble signal from the preamble signal transmission unit 57.
- a preamble sequence (hereinafter referred to as “sequence”) used for random access will be described.
- a plurality of sequences are assigned to one cell.
- the radio base station apparatus 10 and the radio relay station apparatus 30 assign different sequences. In LTE, 64 sequences are assigned to one cell, but 64 different sequences may be assigned to the radio base station apparatus 10 and each radio relay station apparatus 30. For example, as shown in FIG. 5, 64 sequences may be divided into a plurality of subgroups, and different sequences may be assigned to adjacent cells.
- the MAC control unit 53 of the wireless terminal device 50 generates a RACH preamble signal using an arbitrary sequence selected from a plurality of assigned sequences.
- radio base station apparatus 10 and radio relay station apparatus 30 under its control, that is, radio relay station apparatus 30 connected to radio base station apparatus 10 via a radio channel, have the same preamble transmission slot. Use random access parameters.
- the radio relay station device 30 can receive the RACH preamble signal transmitted from the radio terminal device 50 to the radio base station device 10.
- the radio relay station device 30 performs proxy reception even if the radio base station device 10 cannot directly receive the RACH preamble signal from the radio terminal device 50.
- the reception sensitivity of the RACH preamble signal can be improved.
- the source of the RACH preamble signal can be determined.
- the radio terminal device 50 exists at a cell boundary, and the radio base station device 10 or the radio relay station device 30 that manages those cells both receive the RACH preamble signal.
- the cell to which the wireless terminal device 50 is connected can be determined from the sequence used in the RACH preamble signal.
- the sequence used in the RACH preamble signal corresponds to a random access identifier (RA-ID: Random Identity).
- RA-ID Random Identity
- the radio relay station device 30 includes a preamble sequence storage unit 34 that stores a sequence used in the radio base station device 10.
- the radio relay station device 30 receives the RACH preamble signal transmitted to the radio base station device 10 from the radio terminal device 50 existing within the coverage of the radio base station device 10 at the preamble signal receiving unit 37.
- the sequence detection unit 38 detects a sequence from the received RACH preamble signal.
- the radio relay station device 30 refers to the sequence stored in the preamble sequence storage unit 34 to determine whether the sequence detected from the RACH preamble signal is a sequence assigned to the radio base station device 10.
- the MAC control unit 36 of the radio relay station apparatus 30 When the detected sequence is a sequence assigned to the radio base station apparatus 10, the MAC control unit 36 of the radio relay station apparatus 30 generates a reception notification (Reception Notice) including a random identifier corresponding to the sequence.
- the reception notification transmission unit 40 of the radio relay station device 30 transmits the generated preamble reception notification to the radio base station device 10.
- the radio relay station device 30 is a sequence used in a cell managed by the radio relay station device 30 when the sequence of the received RACH preamble signal is not a sequence assigned to the radio base station device 10.
- the MAC control unit 36 generates a RACH response signal.
- the radio relay station device 30 transmits the generated RACH response signal to the radio terminal device 50 through the response signal transmission unit 42.
- the radio base station apparatus 10 receives the RACH preamble signal transmitted from the radio terminal apparatus 50 at the preamble signal receiving unit 15.
- the sequence detection unit 17 detects a sequence from the RACH preamble signal, and obtains a random access identifier corresponding to the sequence. If the sequence is a sequence assigned to the cell of the radio base station, the radio base station apparatus 10 generates a RACH response signal by the MAC control unit 14 and transmits the generated RACH response signal to the radio terminal apparatus 50. However, the radio base station apparatus 10 does not immediately transmit a RACH response signal, but waits to receive a reception notification transferred from the radio relay station apparatus 30.
- FIG. 6 is a diagram illustrating a lapse of time from reception of the RACH preamble signal to transmission of the RACH response signal in the radio base station apparatus 10.
- FIG. 6 illustrates an example in which the radio base station apparatus 10 directly receives a RACH preamble signal from the radio terminal apparatus 50. Even if the radio base station apparatus 10 cannot directly receive the RACH preamble signal, if there is a preamble reception notification from the radio relay station apparatus 30, the physical cell of the radio relay station apparatus 30 will be at the same timing as shown in FIG. A RACH response signal including the ID is transmitted to the wireless terminal device 50.
- the radio base station apparatus 10 when the radio base station apparatus 10 according to the present embodiment receives a RACH preamble signal from the radio terminal apparatus 50, the radio base station apparatus 10 performs a RACH response at a timing in time for the response monitoring first window of the radio terminal apparatus 50. Do not send a signal.
- the radio base station apparatus 10 waits for a reception notification that may be transmitted from the radio relay station apparatus 30.
- the radio base station apparatus 10 transmits a RACH response signal at a timing that can be received in the response monitoring second window of the radio terminal apparatus 50.
- the wireless base station device 10 corresponds to the sequence detected from the RACH preamble signal directly received from the wireless terminal device 50.
- the random access identifier to be obtained is obtained, and it is determined whether or not the obtained random access identifier matches the random access identifier included in the reception notification.
- the radio base station apparatus 10 is such that the radio terminal apparatus 50 exists near the boundary between the coverage area of the radio base station apparatus 10 and the coverage area of the radio relay station apparatus 30 that is the transmission source of the reception notification. Recognize
- the radio terminal device 50 performs cell reselection on the radio relay station device 30. Also in the communication between the radio terminal device 50 and the radio relay station device 30, the sequence used for the current RACH preamble signal and the continuous use of the random access parameter are permitted.
- a plurality of radio relay station devices 30 may be permitted to use a random access identifier continuously, or a radio relay station device 30 selected from a plurality of radio relay station devices 30 may be allowed to continue using a random access identifier. May be.
- the radio base station apparatus 10 notifies the radio terminal apparatus 50 of a sequence that permits continuous use. Specifically, the radio base station apparatus 10 uses the MAC control unit 14 to output a RACH response signal to which a physical cell ID (Physical Cell ID) of a cell managed by the radio relay station apparatus 30 that has transmitted the reception notification is added. Generate.
- the response signal transmission unit 18 of the radio base station apparatus 10 transmits the generated RACH response signal to the radio terminal apparatus 50.
- the RACH response signal includes a physical cell ID, random access identifier (RA-ID), Uplink Grant for Message 3, Tracking Alignment Value, temporary radio channel identifier (Temporary-C-RNTI), etc. Yes.
- the radio base station apparatus 10 generates a permission notice for a random access identifier corresponding to the sequence in the MAC control unit 14 in order to notify the use permission of the sequence to the radio relay station apparatus 30 that is the transmission source of the reception notification.
- the notification is sent to the radio relay station device 30 through the notification transmitter 19.
- the radio base station apparatus 10 notifies the use permission of the sequence by transmitting a permission notice to the radio relay station apparatus 30.
- Information on permission to use the sequence may be obtained by another method.
- the radio relay station device 30 may steal and receive the RACH response signal sent from the radio base station device 10 to the radio terminal device 50.
- “stolen reception” eavesdrop
- the radio relay station device 30 adds to the RACH response signal transmitted to the radio terminal device 50, the random access identifier notified to the radio base station device 10 by the reception notification, and the physical cell ID of the cell managed by the radio relay station device 30. It is determined whether or not is included. If the received notification information is included, it is determined that the radio relay station device 30 is permitted to use the random access sequence corresponding to the random access identifier. According to this method, signaling such as permission notification can be reduced.
- the wireless terminal device 50 receives a RACH response signal including a random access identifier corresponding to the sequence of the transmitted RACH preamble signal in a predetermined reception section (referred to as “window”: see FIG. 6).
- the MAC control unit 54 detects the content of the RACH response signal.
- the radio terminal device 50 uses the radio resource given to the TC-RNTI included in the RACH response signal and the Uplink Grant of Message 3, and the RRC control unit 53 uses the RRC connection request signal (Message 3). And the generated RRC connection request signal is transmitted to the radio base station apparatus 10.
- the RRC connection request signal supports error detection and retransmission by hybrid ARQ (Hybrid ARQ). Thereby, when the radio
- the wireless terminal device 50 waits for an RRC connection setting signal that is a response to the RRC connection request signal. If the radio base station apparatus 10 cannot correctly receive the RRC connection request signal even after performing the hybrid ARQ retransmission, the RACH preamble signal is retransmitted in order to retry the random access procedure. If the wireless terminal device 50 cannot receive the RRC connection setup signal even after the RACH preamble signal has been retransmitted a specified number of times, the MAC control unit 54 of the wireless terminal device 50 recognizes that the random access failure has occurred (Random Access failure). , The RRC control unit 53 is notified of this.
- the wireless terminal device 50 continues cell reselection evaluation (Cell Reselection Evaluation) necessary for cell reselection at the level detection unit 59 even after transmission of the RACH preamble signal.
- the cell reselection evaluation is a process for evaluating the level fluctuation of the received signal of the cell that has transmitted the RACH preamble signal and the cell adjacent thereto.
- the wireless terminal device 50 uses the best cell search unit 60 to determine the reception quality based on the level fluctuation of the received signal of the cell detected by the level detection unit 59.
- the best cell (hereinafter referred to as “best cell”) is searched.
- the wireless terminal device 50 reselects the searched best cell.
- the radio terminal device 50 When transmitting the RACH preamble signal after cell reselection, the radio terminal device 50 detects the physical cell ID of the new cell reselected by the synchronization signal detection unit 58. The MAC control unit 54 of the wireless terminal device 50 determines whether or not the detected physical cell ID is the same as the physical cell ID notified by the RACH preamble signal described above. Thereby, it is determined whether or not the reselected new cell is a cell managed by the radio relay station device 30 permitted to use the random access identifier.
- the MAC control unit 54 of the radio terminal device 50 When it is determined that the reselected cell is a cell managed by the radio relay station device 30 that is permitted to use the random access identifier, the MAC control unit 54 of the radio terminal device 50 last time, the radio base station device 10 A RACH preamble signal is generated when a RACH preamble signal is transmitted to the radio base station apparatus 10 using a sequence (random access identifier corresponding to the sequence) permitted to be continuously used by the radio base station apparatus 10, and the generated RACH preamble signal is transmitted and received wirelessly.
- the data is transmitted from the unit 51 to the radio relay station device 30.
- the wireless terminal device 50 When the physical cell ID of the best cell is different from the physical cell ID included in the RACH response signal, the wireless terminal device 50 performs the same process as the conventional random access procedure. That is, the radio terminal device 50 receives broadcast information of a new cell, detects a random access parameter used in the new cell by the RRC control unit 53, and generates a RACH preamble signal using the detected random accelerator parameter. The generated RACH preamble signal is transmitted.
- the radio relay station apparatus 30 that has received the RACH preamble signal detects the sequence by the sequence detection unit 38. Subsequently, in the radio relay station device 30, the random access identifier determination unit 39 determines whether the random access identifier corresponding to the sequence is a random access identifier permitted to be used from the radio base station device 10. When the random access identifier corresponding to the sequence is a random access identifier that is permitted to be used by the radio base station device 10, the MAC control unit 36 sends the RACH response signal to the sequence assigned to the cell of the radio relay station device 30. It is generated and transmitted to the wireless terminal device 50.
- the radio base station apparatus 10 when the radio base station apparatus 10 receives a reception notification from the radio relay station apparatus 30, the physical of the cell managed by the radio relay station apparatus 30 that has received the reception notification.
- the RACH response signal including the cell ID is transmitted to notify the wireless terminal device 50 of permission for continuous use of the sequence in the cell managed by the wireless relay station device 30 and to permit the wireless relay of the use of the sequence.
- the station device 30 is notified. Thereby, cell reselection was performed from the cell managed by the radio base station apparatus 10 during the random access procedure to the cell managed by the radio relay station apparatus 30 connected from the radio base station apparatus 10 via the radio channel.
- the random access parameter can be continuously used in the new cell, there is no need to read the broadcast information, and the RACH preamble signal can be transmitted immediately in the new cell.
- the radio relay station device 30 that has received use permission transmits a RACH response signal, there is an effect of reducing the latency at the time of establishing a connection.
- the use of the random access sequence is permitted, but when the wireless terminal device 50 permitted to continue the sequence performs cell reselection and transmits the RACH preamble signal in a new cell, As illustrated in FIG. 8, not only the radio relay station device 30 that manages a new cell but also the radio base station device 10 may receive the RACH preamble signal.
- the radio terminal device 50 fails in the RRC connection request to the radio base station device 10
- the cell managed by the radio relay station device 30 is selected by cell reselection, and a RACH preamble signal is sent to the selected radio relay station device 30.
- the radio base station apparatus 10 can recognize the radio terminal apparatus 50 that has transmitted the RACH preamble signal as another radio terminal apparatus 50 that has newly notified the access request. There is sex. In this case, the radio base station apparatus 10 transmits a RACH response signal and allocates resources for an RRC setting request (RRC Set Up request) signal. Since the radio relay station apparatus 30 also sends a RACH response signal and allocates resources for the RRC setting request signal, duplicate resource allocation is performed, resulting in wasteful use of radio resources.
- RRC setting request RRC Set Up request
- the basic configuration of the radio communication system according to the second embodiment is the same as that of the radio communication system according to the first embodiment (see FIGS. 1 to 3).
- the radio base station apparatus 10 determines whether or not the radio terminal apparatus 50 that is the transmission source of the RACH preamble signal is connected to the radio relay station apparatus 30 that is permitted to use the sequence. Based on the determination result, the radio base station apparatus 10 has a function of determining the necessity of transmitting the RACH response signal.
- FIG. 10 is a sequence diagram showing a random access procedure according to the second embodiment.
- the wireless relay station device 30 When receiving the RACH preamble signal including the sequence from the wireless terminal device 50a, the wireless relay station device 30 that has been permitted to use the sequence from the wireless base station device 10 generates a RACH response signal in the MAC control unit 36, and the wireless terminal Transmit to device 50a.
- the radio relay station device 30 generates a RACH preamble signal reception notification and transmits it to the radio base station device 10.
- the MAC control unit 14 reads the contents of the reception notification.
- the radio base station apparatus 10 determines whether the random access identifier read from the reception notification matches the random access identifier corresponding to the sequence used in the RACH preamble signal received from the radio terminal apparatus 50a, and receives the received RACH preamble. It is determined whether or not the signal includes a sequence for which use permission is given to the radio relay station device 30.
- the radio relay station device 30 that is the transmission source of the reception notification is the radio relay station device 30 that has given permission to use the sequence.
- the wireless base station device 10 does not transmit the RACH response signal.
- the radio relay station device 30 When the radio relay station device 30 whose sequence is not permitted from the radio base station device 10 receives the RACH preamble signal including the sequence from the radio terminal device 50b, the radio relay station device 30 transmits a reception notification to the radio base station device 10.
- the radio base station apparatus 10 determines that the transmission source of the reception notification is not the radio relay station apparatus 30 that is permitted to use, and transmits a RACH response signal as in the first embodiment. That is, the radio base station apparatus 10 generates a RACH response signal to which the physical cell ID of the cell managed by the radio relay station apparatus 30 that is the transmission source of the reception notification is added, and transmits the RACH response signal from the radio transmission / reception unit 11 to the radio terminal apparatus 50b.
- the RACH response signal includes a random access identifier (RA-ID), Uplink Grant for Message 3, Tracking Alignment Value, Temporary-C-RNTI, etc. in addition to the physical cell ID.
- RA-ID random access identifier
- the radio base station device 10 when the radio relay station device 30 to which use permission of the sequence is given from the radio base station device 10 receives the RACH preamble signal including the sequence, The MAC control unit 36 generates a RACH response signal, transmits the RACH response signal to the radio terminal device 50a, and transmits a reception notification of the RACH preamble signal to the radio base station device 10.
- the radio base station apparatus 10 determines whether or not the radio terminal apparatus 50a that is the transmission source of the RACH preamble signal is connected to the radio relay station apparatus 30 that is permitted to use the sequence, and the RACH response The need for signal transmission can be determined. Thereby, wasteful use of radio resources due to duplicate resource allocation can be prevented.
- the wireless relay station device 30 transmits a response unnecessary notification transmission for transmitting a random access response unnecessary notification (No RACH Response Notice) to the wireless base station device 10.
- a unit 43 is further provided.
- FIG. 12 is a sequence diagram showing a random access procedure according to the third embodiment of the present invention.
- the MAC control unit 36 when the radio relay station device 30 whose sequence is permitted from the radio base station device 10 receives the RACH preamble signal including the sequence, the MAC control unit 36 generates a RACH response signal. To the wireless terminal device 50.
- the radio relay station apparatus 30 In the second embodiment, the radio relay station apparatus 30 generates a reception notification including a random access identifier and transmits the reception notification to the radio base station apparatus 10, but in the third embodiment, the radio relay station apparatus 30 30 is a random access response unnecessary notification (No RACH Response Notice: hereinafter referred to as “response unnecessary notification”) for notifying that the RACH response signal need not be transmitted from the response unnecessary notification transmitting unit 43 instead of the reception notification. Transmit to the radio base station apparatus 10.
- response unnecessary notification No RACH Response Notice
- the radio base station apparatus 10 When the radio base station apparatus 10 receives a response unnecessary notification within a predetermined time after receiving the RACH preamble signal, the radio base station apparatus 10 does not transmit a RACH response signal for the RACH preamble signal.
- the wireless base station device 10 When receiving the reception notification at a predetermined time as in the processing for the wireless terminal device 50b illustrated in FIG. 12, the wireless base station device 10 is the wireless relay station that is the transmission source of the reception notification, as in the first embodiment.
- the RACH response signal to which the physical cell ID of the cell managed by the device 30 is added is generated by the MAC control unit 14 and transmitted from the response signal transmission unit 18 to the wireless terminal device 50b.
- the RACH response signal includes a physical cell ID, random access identifier (RA-ID), Uplink Grant for Message 3, Tracking Alignment Value, Temporary-C-RNTI, and the like.
- the radio relay station device 30 permitted to use a sequence from the radio base station device 10 receives the RACH preamble signal including the sequence
- the MAC control is performed.
- the unit 36 generates a response unnecessary notification, and transmits the generated response unnecessary notification from the response unnecessary notification transmitting unit 43 to the wireless terminal device 50. This notifies the radio base station apparatus 10 that it is not necessary to transmit the RACH response signal, thereby preventing the allocation of duplicate resources by the radio base station apparatus 10 and preventing the use of radio resources.
- FIG. 13 is a diagram illustrating an example in which the radio terminal device 50b exists within the coverage of the radio base station device 10, is connected to the radio base station device 10, and the radio terminal device 50b transmits a RACH preamble signal.
- the RACH response signal may not be transmitted from the radio base station device 10 to the radio terminal device 50b. If the sequence of the RACH preamble signal transmitted by the radio terminal device 50b coincides with the sequence for which the radio relay station device 30 is permitted to use, the radio relay station device 30 transmits the RACH response signal. 10 does not transmit a RACH response signal.
- the RACH response signal transmitted by the radio relay station device 30 is subjected to cell-specific scrambling. Since the wireless terminal device 50b connected to the wireless base station device 10 uses a code different from the code used by the wireless relay station device 30, scrambling cannot be released. Therefore, in rare cases, when a RACH preamble signal is transmitted by accident using a sequence that is permitted to be used, a RACH response signal cannot be received, and thus RRC connection setup may not be completed. obtain.
- the above problem is solved by performing transmission power control of the RACH preamble signal and time window control for receiving the RACH response signal.
- the radio relay station device 47 includes a response signal monitoring unit 44 that monitors a RACH response signal transmitted from the radio base station device 10 to the radio terminal device 50. I have.
- FIG. 15 is a sequence diagram showing a random access procedure according to the fourth embodiment of the present invention.
- the radio base station apparatus 10 receives the reception notification from the radio relay station apparatus 47 within a specified time, and the random access identifier included in the reception notification is a random access corresponding to the preamble sequence detected from the received RACH preamble signal. It is determined whether or not the identifier matches. When it is determined that the random access identifiers match, the physical cell ID of the cell managed by the radio relay station device 47 that is the transmission source of the preamble reception notification is added to the RACH response signal as in the first embodiment.
- the radio base station apparatus 10 adds a parameter for controlling the transmission power of the RACH preamble signal to be transmitted at the time of cell reselection to the RACH response signal and transmits it to the radio terminal apparatus 50.
- the control parameter includes the reference value P0 of the transmission power of the RACH preamble signal defined by the radio relay station device 47 permitted to continue use, the radio terminal device 50, and the radio relay station device 47. It is the transmission power (RSTP: Reference symbol Transmission power) of the pilot signal (or reference signal) transmitted from the radio relay station apparatus 47 necessary for performing the path loss calculation.
- RSTP Reference symbol Transmission power
- the radio base station apparatus 10 knows in advance the values of the parameters set in the subordinate radio relay station apparatus 47 in advance.
- the radio terminal device 50 after reselecting the cell to the radio relay station device 47, controls the transmission power of the RACH preamble signal using the notified control parameter, and the radio relay station device 47 can receive the RACH preamble signal,
- the radio base station apparatus 10 is prevented from receiving.
- FIGS. 16 and 17 are diagrams illustrating a RACH response signal transmission method of the radio base station apparatus 10 and the radio relay station apparatus 47.
- FIG. FIG. 16 is a diagram illustrating an example when the RACH preamble signal is received by the radio relay station device 47 and the radio base station device 10.
- FIG. 17 is a diagram illustrating an example when the RACH preamble signal is received only by the radio relay station device 47 by the transmission power control of the RACH preamble signal.
- the radio base station apparatus 10 performs the same operation as in the first embodiment on the RACH preamble signal transmitted from the radio terminal apparatus 50 connected to the radio base station apparatus 10.
- a RACH response signal is transmitted.
- the radio relay station apparatus 47 that has received the RACH preamble signal including the sequence that is permitted to use does not immediately transmit the RACH response signal to the radio terminal apparatus 50, and the radio base station apparatus 10 uses the response signal monitoring unit 44. Whether or not a RACH response signal is transmitted from is monitored.
- the response signal monitoring unit 44 steals and receives the RACH response signal transmitted from the radio base station apparatus 10 and includes its own physical cell ID and a random access identifier corresponding to the currently permitted sequence. It is determined whether or not. When the random access identifier corresponding to the permitted sequence is included, the radio relay station device 47 does not transmit the RACH response signal. If the RACH preamble signal including the random access identifier corresponding to the permitted sequence is not stolen during the predetermined time window, the radio relay station device 47, as shown in FIG. A RACH response signal is transmitted to the wireless terminal device 50.
- FIG. 18 is a diagram illustrating a RACH response signal transmission method in the radio base station apparatus 10 and the radio relay station apparatus 47 and a reception time window of the RACH response signal of the radio terminal apparatus 50 corresponding to the transmission timing.
- the radio terminal device 50 that is allowed to continue using a sequence transmits a RACH preamble signal after reselecting a cell to the radio relay station device 47 that is allowed to continue using a sequence
- the RACH response signal is received in the time window.
- the radio terminal device 50 permitted to continue using the sequence re-selects the cell to the radio relay station device 47 permitted to continue using the random access identifier. Thereafter, using the transmission power control parameter notified in advance by the RACH response signal, the transmission power of the RACH preamble signal is appropriately set so as to be received only by the radio relay station device 47.
- the radio relay station device 47 to which the sequence use permission is given confirms whether or not the RACH preamble signal from the radio base station device 10 is transmitted, and then determines whether to transmit the RACH response signal.
- the radio relay station device 30 includes a reception level detection unit 45 that detects the reception level of the RACH preamble signal received by the preamble signal reception unit 37. Prepare.
- FIG. 20 is a sequence diagram showing a random access procedure according to the fifth embodiment of the present invention.
- the radio base station apparatus 10 transmits the RACH preamble signal transmission power reference value P0 and the radio power so that the transmission power of the RACH preamble signal transmitted by the radio terminal apparatus 50 can be controlled.
- the transmission power RSTP of the pilot signal (or reference signal) transmitted from the relay station device 48 is added to the RACH response signal.
- the radio terminal device 50 performs transmission power control of the RACH preamble signal based on the reception power level of the RACH preamble signal received by the radio relay station device 48.
- the radio relay station device 48 when the radio relay station device 48 receives the RACH preamble signal including the sequence used in the connected radio base station device 10, the reception level detection shown in FIG. The reception level of the RACH preamble signal is detected by the unit 45, and a reception notification including the detected reception level is generated by the MAC control unit 36 and transmitted to the radio base station apparatus 10.
- the radio base station device 10 When receiving the reception notification, the radio base station device 10 receives the reception level of the RACH preamble notified by the reception notification and the reception characteristics of the radio relay station device 48, that is, the level at which the RACH preamble signal can be satisfactorily received.
- the MAC control unit 14 calculates a control parameter for controlling the transmission power of the RACH preamble signal.
- This control parameter is used when the radio terminal device 50 performs cell reselection on the radio relay station device 48 that is permitted to use the sequence continuously.
- the power control parameter is defined as AB [dB] when the notified reception level is A [dB] and the level at which the radio relay station device 48 can satisfactorily receive the RACH preamble signal is B [dB]. ].
- the radio base station apparatus 10 adds the calculated control parameter to the RACH response signal and transmits it to the radio terminal apparatus 50.
- the power control parameter may be calculated by the radio relay station device 48. In this case, the power control parameter is added to the reception notification
- the wireless terminal device 50 that is permitted to continue using the sequence is permitted to the wireless relay station device 48 that is permitted.
- the transmission power control parameter notified by the RACH response signal is used to set the transmission power of the RACH preamble signal so as to reach only the radio relay station device 48.
- the radio relay station device 48 to which use permission of the sequence is given confirms whether or not the RACH response signal is transmitted from the radio base station device 10, and then determines whether to transmit the RACH response signal.
- the radio base station device 10 A RACH response signal is transmitted to another wireless terminal device 50.
- the radio base station apparatus 21 includes a permission end notification transmission unit 20 that transmits a notification indicating the end of permission to use a sequence.
- FIG. 22 is a sequence diagram showing a random access procedure according to the sixth embodiment of the present invention.
- the radio base station apparatus 21 transmits a permission notice (Assigning RACH sequence) for notifying the radio relay station apparatus 30 of permission to use the sequence, and starts a timer A in the MAC control unit.
- the MAC control unit 14 When the timer A elapses for a predetermined time, the MAC control unit 14 generates a permission end notification (Assign RACH sequence terminate) to end the use permission.
- the permission end notification includes a random access identifier corresponding to the preamble sequence for ending use permission.
- the permission end notification transmitter 20 of the radio base station device 21 notifies the generated radio relay station device 30 of the generated permission end notification.
- the use permission time is managed by the timer, and when the timer ends, the use of the sequence is ended and the normal operation is restored. This has the effect of limiting the period for performing complex processing corresponding to permission to use the sequence.
- the present invention reduces the latency at the time of establishing a connection that occurs when the wireless relay station apparatus is introduced to a cellular radio system, and has the effect of effectively using radio resources. It can be used as a device, a wireless communication relay station device, a connection establishment method, and the like.
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Abstract
Description
無線中継局装置は、無線端末装置から無線基地局装置に対して送信されるRACHプリアンブル信号を受信するプリアンブル信号受信部と、RACHプリアンブル信号の受信を示す通知であって当該RACHプリアンブル信号のランダムアクセス識別子を含む受信通知を無線基地局装置に送信する受信通知送信部とを備える。これにより、無線中継局装置は、無線端末装置から無線基地局装置に送信されるRACHプリアンブル信号を受信し、RACHプリアンブル信号を受信したことを無線基地局装置に通知する。
図1は、第1の実施の形態に係る無線基地局装置10の構成を示す図、図2は、第1の実施の形態に係る無線中継局装置30の構成を示す図、図3は、第1の実施の形態に係る無線端末装置50を示す図である。また、図4は、第1の実施の形態におけるランダムアクセス手続きを示すシーケンス図である。以下、図1~図4を用いて、第1の実施の形態におけるランダムアクセス手続きと、無線基地局装置10、無線中継局装置30、および無線端末装置50の動作を説明する。
次に、本発明の第2の実施の形態について、図面を参照して詳細に説明する。第1の実施の形態では、ランダムアクセスのシーケンスの使用許可を行ったが、シーケンスの継続使用を許可された無線端末装置50がセル再選択を行い、新しいセルでRACHプリアンブル信号を送信した場合、図8に示すように、新しいセルを管理する無線中継局装置30だけでなく、無線基地局装置10もRACHプリアンブル信号を受信する可能性がある。
次に、本発明の第3の実施の形態の無線通信システムについて説明する。第3の実施の形態の無線通信システムの基本的な構成は、第1の実施の形態の無線通信システムと同じである。第3の実施の形態の無線通信システムでは、図11に示すように、無線中継局装置30が、無線基地局装置10にランダムアクセスレスポンス不要通知(No RACH Response Notice)を送信するレスポンス不要通知送信部43をさらに備える。
次に、本発明の第4の実施の形態について、図面を参照して詳細に説明する。図13は、無線端末装置50bが無線基地局装置10のカバレッジ内に存在し、無線基地局装置10に接続しており、無線端末装置50bがRACHプリアンブル信号を送信する例を示す図である。シーケンスの継続使用を許可された無線端末装置50aとは異なる無線端末装置50bがRACHプリアンブル信号を送信すると、無線基地局装置10から無線端末装置50bにRACHレスポンス信号が送信されないことがあり得る。無線端末装置50bが送信したRACHプリアンブル信号のシーケンスが、無線中継局装置30に使用許可が与えられたシーケンスとたまたま一致すると、無線中継局装置30がRACHレスポンス信号を送信するので、無線基地局装置10はRACHレスポンス信号を送信しない。
次に、本発明の第5の実施の形態の無線通信システムについて説明する。第5の実施の形態の無線通信システムの基本的な構成は、第4の実施の形態の無線通信システムと同じである。第5の実施の形態の無線通信システムでは、図19に示すように、無線中継局装置30は、プリアンブル信号受信部37にて受信したRACHプリアンブル信号の受信レベルを検出する受信レベル検出部45を備える。
次に、本発明の第6の実施の形態の無線通信システムについて説明する。第6の実施の形態の無線通信システムの基本的な構成は、第1の実施の形態の無線通信システムと同じである。第6の実施の形態の無線通信システムでは、図21に示すように、無線基地局装置21は、シーケンスの使用許可の終了を示す通知を送信する許可終了通知送信部20を備えている。
Claims (23)
- 無線端末装置(User Equipment)との通信を制御する無線基地局装置(eNode B)と、前記無線基地局装置と前記無線端末装置との間の通信を中継する無線中継局装置(Relay Node)とを有する無線通信システムに適用される前記無線基地局装置であって、
前記無線端末装置から送信されるランダムアクセスプリアンブル信号(RACH Preamble)を受信するプリアンブル信号受信部と、
前記無線中継局装置が前記ランダムアクセスプリアンブル信号を受信したことを示す受信通知を前記無線中継局装置から受信する受信通知受信部と、
前記無線端末装置から送信されたランダムアクセスプリアンブル信号のランダムアクセス識別子(RA-ID)と、前記無線中継局装置から送信された前記受信通知に含まれるランダムアクセス識別子が一致する場合に、前記無線中継局装置に前記ランダムアクセス識別子の使用を許可し、前記ランダムアクセス識別子の使用を許可した前記無線中継局装置が管理するセルのセル識別子(Cell ID)を含むランダムアクセスレスポンス信号(RACH Response)を前記無線端末装置に送信するレスポンス信号送信部と、
を備える無線基地局装置。 - 前記無線中継局装置に前記ランダムアクセス識別子の使用を許可したことを示す許可通知を送信する許可通知送信部を備える請求項1に記載の無線基地局装置。
- 前記無線端末装置から送信されてきたランダムアクセスプリアンブル信号を受信してから所定の時間が経過するまで、前記無線中継局装置からの前記受信通知を待つ請求項1または2に記載の無線基地局装置。
- 同じランダムアクセス識別子を含む前記受信通知を複数の無線中継局装置から受信した場合に、前記複数の無線中継局装置の中から選択した無線中継局装置に前記ランダムアクセス識別子の使用を許可する請求項1~3のいずれかに記載の無線基地局装置。
- 前記レスポンス信号送信部は、前記受信通知の送信元の無線中継局装置が、ランダムアクセス識別子の使用を許可した無線中継局装置であるか否かを判定し、使用を許可した無線中継局装置の場合に、前記無線端末装置に前記ランダムアクセスレスポンス信号を送信しない請求項1~4のいずれかに記載の無線基地局装置。
- ランダムアクセス識別子の使用を許可した前記無線中継局装置から、前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号の送信が不要であることを示す通知を受信した場合に、前記無線端末装置へ前記ランダムアクセスレスポンス信号を送信しない請求項1~4のいずれかに記載の無線基地局装置。
- 前記レスポンス信号送信部は、前記ランダムアクセス識別子の使用を許可した無線中継局装置において規定されているランダムアクセスプリアンブル信号の送信パワーの基準値と、前記無線中継局装置から送信されるパイロット信号の送信パワー(RSTP:Reference symbol Transmission power)を含むランダムアクセスレスポンス信号を送信する請求項1~6のいずれかに記載の無線基地局装置。
- 前記レスポンス信号送信部は、前記受信通知に含まれる受信レベルと、前記無線中継局装置の受信特性とに基づいて、前記無線端末装置から前記無線中継局装置に対して送信するランダムアクセスプリアンブル信号の送信パワーを制御するための制御パラメータを前記ランダムアクセスレスポンス信号に含めて送信する請求項1~6のいずれかに記載の無線基地局装置。
- 前記許可通知送信部にて、前記許可通知を前記無線中継局装置に送信した後に所定の時間が経過したときに、前記無線中継局装置に対する前記ランダムアクセス識別子の使用許可の終了を示す通知を送信する許可終了通知送信部を備える請求項1~8のいずれかに記載の無線基地局装置。
- 無線端末装置(User Equipment)との通信を制御する無線基地局装置(eNode B)と、
前記無線基地局装置と前記無線端末装置との間の通信を中継する無線中継局装置(Relay Node)とを有する無線通信システムに適用される無線中継局装置であって、
前記無線端末装置から前記無線基地局装置に対して送信されるランダムアクセスプリアンブル信号(RACH Preamble)を受信するプリアンブル信号受信部と、
前記ランダムアクセスプリアンブル信号の受信を示す通知であって当該ランダムアクセスプリアンブル信号のランダムアクセス識別子を含む受信通知を前記無線基地局装置に送信する受信通知送信部と、
前記ランダムアクセスプリアンブル信号に含まれるランダムアクセス識別子の使用を前記無線基地局装置から許可された場合に、前記ランダムアクセスレスポンス信号に含まれるランダムアクセス識別子を記憶する許可識別子記憶部と、
前記無線端末装置から送信されたランダムアクセスプリアンブル信号を受信したときに、そのランダムアクセスプリアンブル信号のランダムアクセス識別子と前記許可識別子記憶部に記憶されたランダムアクセス識別子とが一致するか否かを判定するランダムアクセス識別子判定部と、
前記ランダムアクセス識別子が一致すると判定された場合に、前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号を前記無線端末装置に送信するレスポンス信号送信部と、
を備える無線中継局装置。 - 前記無線基地局装置から前記ランダムアクセス識別子の使用が許可されたことを示す許可通知を受信する許可通知受信部を備え、
前記許可通知に含まれるランダムアクセス識別子を前記許可識別子記憶部に記憶する請求項10に記載の無線中継局装置。 - 前記無線基地局装置から前記無線端末装置に送信されるランダムアクセスレスポンス信号を受信するレスポンス信号受信部を備え、
前記レスポンス信号受信部にて受信したランダムアクセスレスポンス信号に、前記無線中継局装置が管理するセルのセル識別子が含まれている場合に、前記ランダムアクセスレスポンス信号に含まれるランダムアクセス識別子を前記許可識別子記憶部に記憶する請求項10または11に記載の無線中継局装置。 - 前記ランダムアクセス識別子判定部にて、前記ランダムアクセス識別子が一致すると判定された場合に、前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号の送信が不要であることを示す通知を前記無線基地局装置に送信する送信部を備える請求項10または11に記載の無線中継局装置。
- 前記ランダムアクセス識別子判定部にて、前記ランダムアクセス識別子が一致すると判定された場合に、前記無線基地局装置から前記無線端末装置に対して前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号が送信されたか否かを監視するレスポンス信号監視部を備え、
前記レスポンス信号送信部は、所定の時間内にランダムアクセスレスポンス信号が送信されない場合に、前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号を前記無線端末装置に送信する請求項10~13のいずれかに記載の無線中継局装置。 - 前記ランダムアクセスプリアンブル信号の受信レベルを検知する受信レベル検知部と、
前記ランダムアクセス識別子判定部にて、前記ランダムアクセス識別子が一致すると判定された場合に、前記無線基地局装置から前記無線端末装置に対して前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号が送信されたか否かを監視するレスポンス信号監視部を備え、
前記受信通知送信部は、前記ランダムアクセスプリアンブル信号の受信レベルを前記受信通知に含めて前記無線基地局装置に送信し、
前記レスポンス信号送信部は、所定の時間内にランダムアクセスレスポンス信号が送信されない場合に、前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号を前記無線端末装置に送信する請求項10~14のいずれかに記載の無線中継局装置。 - 前記ランダムアクセス識別子の使用許可の終了を通知する許可終了通知を前記無線基地局装置から受信したときに、前記許可終了通知に対応するランダムアクセス識別子を前記許可識別子記憶部から消去する請求項10~15のいずれかに記載の無線中継局装置。
- 無線端末装置(User Equipment)との通信を制御する無線基地局装置(eNode B)と、前記無線基地局装置と前記無線端末装置との間の通信を中継する無線中継局装置(Relay Node)とを有する無線通信システムに適用される無線端末装置であって、
ランダムアクセスプリアンブル信号を送信するプリアンブル信号送信部と、
前記ランダムアクセスプリアンブル信号に応じて前記無線基地局装置から送信される前記ランダムアクセスレスポンス信号を受信したときに、RRC接続要求(RRC Connection Request)を前記無線基地局装置に送信するRRC制御部と、
前記RRC接続要求によるRRC接続が失敗した場合に、受信品質が最良のベストセルを探索するベストセル探索部と、
を備え、
前記プリアンブル信号送信部は、前記ベストセルのセル識別子が前記ランダムアクセスレスポンス信号に含まれるセル識別子と一致する場合に、前記ランダムアクセスレスポンス信号に含まれるランダムアクセス識別子を含むランダムアクセスプリアンブル信号を前記無線中継局装置に送信する無線端末装置。 - 前記プリアンブル信号送信部は、前記ランダムアクセスレスポンス信号に含まれるランダムアクセスプリアンブル信号の送信パワーの基準値とパイロット信号の送信パワーとに基づいて、前記無線中継局装置が受信可能で、かつ、前記無線基地局装置が受信不可能な送信パワーで前記ランダムアクセスプリアンブル信号を送信する請求項17に記載の無線端末装置。
- 前記プリアンブル信号送信部は、前記ランダムアクセスレスポンス信号に含まれる制御パラメータに基づいて、前記無線中継局装置が受信可能で前記無線基地局装置が受信不可能な送信パワーで前記ランダムアクセスプリアンブル信号を送信する請求項17に記載の無線端末装置。
- 無線端末装置(User Equipment)との通信を制御する無線基地局装置(eNode B)と、前記無線基地局装置と前記無線端末装置との間の通信を中継する無線中継局装置(Relay Node)とを有する無線通信システムであって、
前記無線中継局装置は、
前記無線端末装置から前記無線基地局装置に対して送信されるランダムアクセスプリアンブル信号(RACH Preamble)を受信するプリアンブル信号受信部と、
前記ランダムアクセスプリアンブル信号の受信を示す通知であって当該ランダムアクセスプリアンブル信号のランダムアクセス識別子を含む受信通知を前記無線基地局装置に送信する受信通知送信部と、を備え、
前記無線基地局装置は、
前記無線端末装置から送信されるランダムアクセスプリアンブル信号を受信するプリアンブル信号受信部と、
前記無線中継局装置から送信される受信通知を受信する受信通知受信部と、
前記無線端末装置から送信されたランダムアクセスプリアンブル信号のランダムアクセス識別子(RA-ID)と、前記無線中継局装置から送信された受信通知に含まれるランダムアクセス識別子が一致する場合に、前記無線中継局装置に前記ランダムアクセス識別子の使用を許可し、前記ランダムアクセス識別子の使用を許可した前記無線中継局装置が管理するセルのセル識別子(Cell ID)を含むランダムアクセスレスポンス信号(RACH Response)を前記無線端末装置に送信するレスポンス信号送信部と、を備え、
前記無線中継局装置は、
前記ランダムアクセスプリアンブル信号に含まれるランダムアクセス識別子の使用を前記無線基地局装置から許可された場合に、前記ランダムアクセスレスポンス信号に含まれるランダムアクセス識別子を記憶する許可識別子記憶部を備え、
前記無線端末装置は、
前記無線基地局装置から送信される前記ランダムアクセスレスポンス信号を受信したときに、RRC接続要求を前記無線基地局装置に送信するRRC制御部と、
前記RRC接続要求によるRRC接続が失敗した場合に、受信品質が最良のベストセルを探索するベストセル探索部と、
前記ベストセルのセル識別子が前記ランダムアクセスレスポンス信号に含まれるセル識別子と一致する場合に、前記ランダムアクセスレスポンス信号に含まれるランダムアクセス識別子を含むランダムアクセスプリアンブル信号を前記無線中継局装置に送信するプリアンブル信号送信部と、を備え
前記無線中継局装置は、
前記ランダムアクセスプリアンブル信号を受信したときに、そのランダムアクセスプリアンブル信号のランダムアクセス識別子と前記許可識別子記憶部に記憶されたランダムアクセス識別子とが一致するか否かを判定するランダムアクセス識別子判定部と、
前記ランダムアクセス識別子が一致すると判定された場合に、前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号を前記無線端末装置に送信するレスポンス信号送信部と、
を備える無線通信システム。 - 無線端末装置(User Equipment)との通信を制御する無線基地局装置(eNode B)と、前記無線基地局装置と前記無線端末装置との間の通信を中継する無線中継局装置(Relay Node)とを有する無線通信システムに適用される前記無線基地局装置の無線制御方法であって、
前記無線端末装置から送信されるランダムアクセスプリアンブル信号を受信するステップと、
前記無線中継局装置が前記ランダムアクセスプリアンブル信号を受信したことを示す受信通知を前記無線中継局装置から受信するステップと、
前記無線端末装置から送信されたランダムアクセスプリアンブル信号のランダムアクセス識別子(RA-ID)と、前記無線中継局装置から送信された受信通知に含まれるランダムアクセス識別子が一致する場合に、前記無線中継局装置に前記ランダムアクセス識別子の使用を許可し、前記ランダムアクセス識別子の使用を許可した前記無線中継局装置が管理するセルのセル識別子(Cell ID)を含むランダムアクセスレスポンス信号(RACH Response)を前記無線端末装置に送信するステップと、
を備える無線制御方法。 - 無線端末装置(User Equipment)との通信を制御する無線基地局装置(eNode B)と、前記無線基地局装置と前記無線端末装置との間の通信を中継する無線中継局装置(Relay Node)とを有する無線通信システムに適用される無線中継局装置の無線制御方法であって、
前記無線端末装置から前記無線基地局装置に対して送信されるランダムアクセスプリアンブル信号(RACH Preamble)を受信するステップと、
前記ランダムアクセスプリアンブル信号の受信を示す通知であって当該ランダムアクセスプリアンブル信号のランダムアクセス識別子を含む受信通知を前記無線基地局装置に送信するステップと、
前記ランダムアクセスプリアンブル信号に含まれるランダムアクセス識別子の使用を前記無線基地局装置から許可された場合に、前記ランダムアクセスレスポンス信号に含まれるランダムアクセス識別子を記憶するステップと、
前記無線端末装置から送信されたランダムアクセスプリアンブル信号を受信したときに、そのランダムアクセスプリアンブル信号のランダムアクセス識別子が前記ランダムアクセス識別子記憶ステップにて記憶されたランダムアクセス識別子と一致するか否かを判定するステップと、
前記ランダムアクセス識別子が一致すると判定された場合に、前記ランダムアクセスプリアンブル信号に対するランダムアクセスレスポンス信号を前記無線端末装置に送信するステップと、
を備える無線制御方法。 - 無線端末装置(User Equipment)との通信を制御する無線基地局装置(eNode B)と、前記無線基地局装置と前記無線端末装置との間の通信を中継する無線中継局装置(Relay Node)とを有する無線通信システムに適用される無線端末装置の無線制御方法であって、
ランダムアクセスプリアンブル信号を送信するステップと、
前記ランダムアクセスプリアンブル信号に応じて前記無線基地局装置から送信される前記ランダムアクセスレスポンス信号を受信したときに、RRC接続要求を前記無線基地局装置に送信するステップと、
前記RRC接続要求によるRRC接続が失敗した場合に、受信品質が最良のベストセルを探索するステップと、
を備え、
前記ランダムアクセスプリアンブル信号を送信するステップは、前記ベストセルのセル識別子と前記ランダムアクセスレスポンス信号に含まれるセル識別子とが一致する場合に、前記ランダムアクセスレスポンス信号に含まれるランダムアクセス識別子を含むランダムアクセスプリアンブル信号を前記無線中継局装置に送信する無線制御方法。
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Also Published As
Publication number | Publication date |
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JPWO2009157124A1 (ja) | 2011-12-08 |
EP2302965A4 (en) | 2017-07-26 |
CN102077633B (zh) | 2014-07-02 |
US8699364B2 (en) | 2014-04-15 |
CN102077633A (zh) | 2011-05-25 |
EP2302965B1 (en) | 2018-09-19 |
JP5345618B2 (ja) | 2013-11-20 |
EP2302965A1 (en) | 2011-03-30 |
US20110110258A1 (en) | 2011-05-12 |
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