WO2011004645A1 - Système de communication sans fil à sauts multiples, appareil de gestion, appareil de communication et procédé de commande - Google Patents

Système de communication sans fil à sauts multiples, appareil de gestion, appareil de communication et procédé de commande Download PDF

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Publication number
WO2011004645A1
WO2011004645A1 PCT/JP2010/056525 JP2010056525W WO2011004645A1 WO 2011004645 A1 WO2011004645 A1 WO 2011004645A1 JP 2010056525 W JP2010056525 W JP 2010056525W WO 2011004645 A1 WO2011004645 A1 WO 2011004645A1
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station
processing time
communication device
scheduling
radio resource
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PCT/JP2010/056525
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English (en)
Japanese (ja)
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義和 渡邊
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日本電気株式会社
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Priority to JP2011521851A priority Critical patent/JP5182423B2/ja
Publication of WO2011004645A1 publication Critical patent/WO2011004645A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

Definitions

  • the present invention relates to multi-hop wireless communication in which a relay station is arranged between a base station and a mobile terminal station.
  • WiMAX Worldwide Interoperability for Microwave Access
  • WiMAX is defined in the IEEE 802.16-2004 standard (Non-Patent Document 1) and the IEEE 802.16e standard (Non-Patent Document 2).
  • the IEEE 802.16-2004 standard and the IEEE 802.16e standard will be collectively referred to as the IEEE 802.16e standard.
  • Multi-hop wireless communication system There is a multi-hop wireless communication system as a kind of wireless communication system. Multi-hop communication is also referred to as relay communication.
  • IEEE 802.16j TG (Task Group) studies are being made to enable the multi-hop wireless communication by extending the IEEE 802.16e standard.
  • a multi-hop wireless communication system is one in which one or a plurality of relay stations are arranged between a base station and a mobile terminal station of a wireless communication system for the purpose of coverage expansion, throughput improvement, and dead zone countermeasures.
  • a packet from a base station to a mobile terminal station is once transmitted from the base station to the relay station, and then transmitted from the relay station to the mobile terminal station.
  • a packet from the mobile terminal station to the base station is once transmitted from the mobile terminal station to the relay station, and then transmitted from the relay station to the base station.
  • a multi-hop wireless communication system it is possible to communicate with a mobile terminal station in an area where direct wireless communication with a base station cannot be performed. That is, coverage is expanded by using multi-hop, and insensitive areas are reduced. Furthermore, since the distance between the stations is shortened when the relay station enters the communication path, the quality of the received radio wave is improved. As a result, the throughput is improved by selecting a highly efficient modulation method in adaptive modulation.
  • radio resource allocation is necessary to perform normal communication while avoiding interference.
  • radio resources to be assigned include time slots and subchannels in TDMA (Time Division Multiple Access) and OFDMA.
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Multiple Access
  • the subject of the present invention is not limited to the wireless communication system using them.
  • the base station In centralized scheduling, the base station also performs scheduling (radio resource allocation) for all relay stations that are under its control.
  • the scheduling of the radio communication area under the relay station is performed by the base station, and the allocated radio resource is notified from the base station to the relay station.
  • the relay station performs wireless communication based on the notified scheduling.
  • FIG. 1 An example of the configuration of a multi-hop wireless communication system in which centralized scheduling and distributed scheduling are mixed is shown in FIG.
  • the dashed arrows indicate the scheduling subject and target.
  • the starting point of the arrow indicates the subject of scheduling.
  • the end point of the arrow indicates a scheduling target, that is, a radio resource whose allocation is determined by scheduling.
  • distributed scheduling is used from the base station to the relay station B, and centralized scheduling is used after the relay station B.
  • the base station performs scheduling of the radio link between the base station and the mobile terminal station D and between the base station and the relay station A, but does not perform scheduling of the radio link between the relay station A and the mobile terminal station A, for example.
  • the relay station A performs scheduling of the radio link.
  • the relay station B performs scheduling of the radio link between the relay station C and the mobile terminal station C in addition to the radio link between the relay station B and the mobile terminal station B and between the relay station B and the relay station C.
  • a base station or a relay station that performs radio assignment scheduling for a mobile terminal station is referred to as a “scheduling station”.
  • the base station is a scheduling station.
  • the scheduling station is a base station or a relay station (referred to as an access station) with which a mobile terminal station is directly communicating.
  • the relay station closest to the mobile terminal station among the relay stations at the boundary between distributed scheduling and centralized scheduling is the scheduling station.
  • the scheduling stations for mobile terminal stations A, B, C, and D are relay station A, relay station B, relay station B, and base station, respectively.
  • radio resource allocation for uplink data in the IEEE 802.16e standard will be described.
  • the mobile terminal station when a mobile terminal station transmits uplink data to a base station, the mobile terminal station first transmits a bandwidth request including the size of the uplink data to the base station or relay station.
  • the base station or the relay station When receiving the bandwidth request, the base station or the relay station performs uplink radio resource allocation corresponding to the requested size for the mobile terminal station.
  • the uplink radio resource allocation information is notified from the base station or the relay station to the mobile terminal station by UL-MAP included in the radio frame.
  • the mobile terminal station checks whether the uplink radio resource allocation to the mobile station is included in the UL-MAP. When the allocation is included, the mobile terminal station can transmit uplink data using the allocated radio resource.
  • An uplink radio resource is also required to transmit the above bandwidth request itself.
  • the mobile terminal station In a state where no uplink radio resource is assigned to the mobile terminal station, the mobile terminal station first requests an uplink radio resource for transmitting a bandwidth request. The request is made by transmitting a band request ranging code in a ranging subchannel prepared in the uplink region of the radio frame. The ranging subchannel is multiplex-connected by CDMA (Code Division Multiple Access).
  • CDMA Code Division Multiple Access
  • the base station or relay station receives the band request ranging code
  • the mobile terminal station that has transmitted the code prepares an uplink radio resource for transmitting the band request.
  • the base station or the relay station notifies the mobile terminal station of allocation information including the uplink radio resource and the bandwidth request ranging code by CDMA Allocation Information Element (IE).
  • IE CDMA Allocation Information Element
  • the mobile terminal station receives the CDMA Allocation IE including the band request ranging code transmitted by itself, the mobile terminal station can transmit the band request using the uplink radio resource specified
  • a sleep mode is defined as one of the states of the mobile terminal station in order to reduce the power consumption of the mobile terminal station.
  • the state of a mobile terminal station performing normal communication instead of the sleep mode is referred to as a normal mode.
  • the state change between the mobile terminal station in the normal mode and the sleep mode occurs, for example, by exchanging MAC (Media Access Control) control messages between the base station and the mobile terminal station.
  • the state change also occurs when traffic to be transmitted / received between the base station and the mobile terminal station occurs.
  • the mobile terminal station in the sleep mode intermittently communicates with the base station while maintaining the connection with the base station.
  • the time during which the mobile terminal station and the base station can communicate is referred to as a listening period, and the time during which communication cannot be performed is referred to as a sleep window.
  • the mobile terminal station in sleep mode repeats the listening period and sleep period alternately.
  • the base station does not transmit any data to the mobile terminal station during the sleep period.
  • the base station transmits the data to the mobile terminal station while the mobile terminal station is in the listening period, or ends the sleep mode and shifts to the normal mode. To the mobile terminal station.
  • the mobile terminal station in the sleep mode can stop the power supply to the wireless communication circuit during the sleep period, and as a result, the power consumption can be reduced.
  • the length of the listening period and sleep period may be fixed or may change dynamically.
  • the base station and the mobile terminal station share the length of the listening period and the sleep period of the mobile terminal station by transmitting and receiving MAC control messages.
  • the mobile terminal station in the sleep mode may transmit a bandwidth request during the sleep period when uplink data to be transmitted occurs. Thereafter, the mobile terminal station may end the sleep mode and shift to the normal mode, or may continue the sleep mode. Which operation is performed is determined according to the sleep mode setting shared between the base station and the mobile terminal station when the mobile terminal station shifts from the normal mode to the sleep mode.
  • IEEE Standard 802.16-2004 "IEEE Standard for Local and Metropolitan Area Networks-Part16: Air Interface for Fixed Bandwidths” IEEE Std 802.16e-2005, "Amendment to IEEE Standard for Local and Metropolitan Area Networks-Part16: Air Interface for Fixed Broadband Wireless Access Systems-Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands"
  • band request processing time Time (hereinafter referred to as “band request processing time”) cannot be grasped.
  • the mobile terminal station In multi-hop wireless communication such as the IEEE 802.16j standard described above, the mobile terminal station transmits a band request ranging code or a band request message, and then receives an uplink radio resource assignment corresponding to the request message. Time (hereinafter referred to as “band request processing time”) cannot be grasped.
  • the bandwidth request processing time there is no method for the mobile terminal station to know the bandwidth request processing time.
  • the bandwidth request processing time can be expected to be one frame time.
  • the bandwidth request processing time for the mobile terminal station is the number of intermediate relay stations and which base station or relay station is a scheduling station. It depends on.
  • radio resources are allocated to the request in the next frame that has transmitted the bandwidth request in the shortest time. This is because the mobile terminal stations A, B, and D are directly connected to the scheduling station.
  • the mobile terminal station C transmits a bandwidth request, from the transmission of the bandwidth request until radio resource allocation for the request is performed, here, until the UL-MAP including the allocation is transmitted from the relay station C At least 3 frames are required. That is, two frames are required for the request to reach the relay station B which is the scheduling station, and one frame is required for the radio resource allocation information assigned to the mobile terminal station C by the relay station B to the relay station C. Because there is.
  • the mobile terminal station does not know the bandwidth request processing time, it will be difficult to reduce the power consumption of the mobile terminal station or to efficiently use the frequency.
  • the mobile terminal station temporarily turns off the power of the transmission / reception circuit before transmitting the bandwidth request ranging code or bandwidth request until the uplink radio resource is allocated. Can be reduced.
  • the mobile terminal station does not know when the uplink radio resource is allocated to itself after transmitting the bandwidth request ranging code or bandwidth request. You must check for assignments. Therefore, even if the bandwidth request processing time is long, the mobile terminal station device cannot reduce the power consumption by turning off the power of the transmission / reception circuit.
  • the mobile terminal station needs to retransmit the message.
  • the bandwidth request processing time is not known, the mobile terminal station does not know how long it should wait to retransmit the message when no radio resource is allocated. Therefore, the mobile terminal station cannot consider the bandwidth request processing time in determining the timeout time for determining retransmission. As a result, for example, there is a possibility that the mobile terminal station resends the message even though the request is processed normally. Such retransmission of unnecessary requests deteriorates frequency utilization efficiency.
  • the mobile terminal station knows the bandwidth request processing time, it can be used for various controls, but the mobile terminal station could not grasp it.
  • An object of the present invention is to provide a technology that enables a mobile terminal station to grasp the time taken from when a mobile terminal station requests a radio resource to receiving the allocation in a multi-hop wireless communication system. is there.
  • the multi-hop wireless communication system of the present invention realizes multi-hop wireless communication by a relay station connected to a base station, and either the base station or the relay station becomes a scheduling station.
  • a multi-hop wireless communication system that centrally allocates radio resources of the scheduling station and a relay station between the scheduling station and a communication device, Processing time information indicating a processing time from when a communication device requests a radio resource to the scheduling station until a radio resource is allocated from the scheduling station to the communication device, the communication device and the base station or the relay station Processing time information generating means for generating based on the connection configuration of Processing time information notifying means for notifying the communication device of the processing time information obtained by the processing time information generating means.
  • the management apparatus of the present invention realizes multi-hop wireless communication by a relay station connected to a base station, and either the base station or the relay station becomes a scheduling station, the scheduling station, and the scheduling station
  • a management device in a multi-hop wireless communication system that centrally allocates radio resources of relay stations between communication devices, Processing time information indicating a processing time from when a communication device requests a radio resource to the scheduling station until a radio resource is allocated from the scheduling station to the communication device, the communication device and the base station or the relay station
  • Processing time information generating means for generating based on the connection configuration of Processing time information notifying means for notifying the communication device of the processing time information obtained by the processing time information generating means.
  • the control method of the present invention realizes multi-hop wireless communication by a relay station connected to a base station, and either the base station or the relay station becomes a scheduling station, the scheduling station, and the scheduling station
  • a control method for a multi-hop wireless communication system that centrally allocates radio resources of relay stations between communication devices, Processing time information indicating a processing time from when a communication device requests a radio resource to the scheduling station until a radio resource is allocated from the scheduling station to the communication device, the communication device and the base station or the relay station Based on the connection configuration of The obtained processing time information is notified to the communication device.
  • FIG. 6 is a sequence diagram showing an example of the operation of the multihop wireless communication system according to the first embodiment when a mobile terminal station 300 makes a registration request to the base station 100 in network entry processing.
  • 5 is a flowchart showing an example of operation of the base station 100 when receiving a REG-REQ message.
  • 6 is a flowchart showing an example of operation of the mobile terminal station 300 when receiving a REG-RSP message.
  • 7 is a flowchart showing an example of operation of the mobile terminal station 300 when uplink data is generated in the upper layer processing unit 301 of the mobile terminal station 300 during the sleep period in the sleep mode. It is a block diagram which shows the structure of the mobile terminal station 300 in 2nd Embodiment. It is a flowchart which shows an example of operation
  • a WiMAX system in which a relay station is arranged between a base station and a mobile terminal station to perform multihop communication based on the IEEE 802.16e standard and the IEEE 802.16j standard.
  • either the base station or the relay station serves as a scheduling station, and the scheduling station centrally allocates radio resources of the scheduling station and the relay station between the scheduling station and the communication device.
  • the base station calculates the processing time (bandwidth request processing time) and notifies the mobile terminal station. Thereby, the mobile terminal station can grasp the time taken from the time when the mobile terminal station requests the radio resource until the mobile terminal station receives the allocation.
  • the mobile terminal station When the mobile terminal station transmits a bandwidth request ranging code or a bandwidth request during the sleep period of the sleep mode, the mobile terminal station sets the wireless transmission / reception circuit to the power saving mode during the bandwidth request processing time after the request transmission. This reduces power consumption and improves power efficiency.
  • the mobile terminal station when a response to the transmitted request message cannot be obtained, the mobile terminal station retransmits the request message at a predetermined retransmission interval.
  • the mobile terminal station determines the retransmission interval based on the bandwidth request processing time. This improves the frequency utilization efficiency.
  • the mobile terminal station requests radio resources here, the relay station may request radio resources. Even in that case, the base station calculates and notifies the bandwidth request processing time, and the scheduling station allocates radio resources.
  • FIG. 2 A block diagram of a multi-hop wireless communication system according to the first embodiment is shown in FIG. Referring to FIG. 2, the multi-hop wireless communication system according to the first embodiment includes a base station 100, relay stations 200-1 and 200-2, and a mobile terminal station 300.
  • the base station 100 and the relay station 200-1 are connected via the wireless communication line 1.
  • the relay station 200-1 and the relay station 200-2, and the relay station 200-2 and the mobile terminal station 300 are also connected via the wireless communication line 1.
  • Base station 100 and mobile terminal station 300 perform multi-hop wireless communication via relay stations 200-1 and 200-2. That is, a packet from the base station 100 to the mobile terminal station 300 is first transmitted from the base station 100 to the relay station 200-1, and then transmitted from the relay station 200-1 to the relay station 200-2. 200-2 is transmitted to the mobile terminal station 300. Similarly, a packet from the mobile terminal station 300 to the base station 100 is first transmitted from the mobile terminal station 300 to the relay station 200-2, then transferred by the relay station 200-2 and the relay station 200-1, and finally transmitted. To the base station 100.
  • the relay stations 200-1 and 200-2 are relay stations compliant with the IEEE 802.16e standard and the IEEE 802.16j standard. Therefore, detailed description of relay stations 200-1 and 200-2 is omitted.
  • FIG. 3 is a block diagram showing the configuration of the base station 100.
  • the base station 100 includes an upper layer processing unit 101, a wireless MAC processing unit 102, a wireless IF (Interface) unit 103, and a bandwidth request processing time calculation unit 104.
  • the upper layer processing unit 101 performs protocol processing for upper layer communication using this multi-hop wireless communication system.
  • An example of the upper layer communication protocol is IP (Internet Protocol).
  • the wireless MAC processing unit 102 performs processing of the MAC layer of the base station defined by the IEEE 802.16e standard and the IEEE 802.16j standard.
  • the MAC processing performed by the wireless MAC processing unit 102 includes scheduling, conversion from upper layer packet to MAC PDU (Media Access Control Payload Data Unit) and its reverse conversion, connection management, QoS (Quality of Service) control, topology management, Route control, network entry processing, retransmission control, transmission queue management, and the like are included.
  • Information held by the wireless MAC processing unit 102 for topology management includes information on which scheduling method is used by the relay station under the base station 100, minimum bandwidth request processing delay, and minimum uplink, which will be described later. Transfer delay, and minimum downlink transfer delay are included.
  • the information held by the wireless MAC processing unit 102 for route control includes routes from the base station 100 to the relay stations 200-1 and 200-2 and the mobile terminal station 300 that are subordinate to the base station 100. It is.
  • the wireless MAC processing unit 102 transmits the mobile terminal station 300 to the bandwidth request processing time calculation unit 104. Requests the calculation of the bandwidth request processing time for the station 300 and transmits a MAC message including the result to the mobile terminal station 300.
  • the wireless IF unit 103 performs processing of the PHY layer of the base station defined by the IEEE 802.16e standard and the IEEE 802.16j standard.
  • the wireless IF unit 103 is connected to the relay station 200-1 via the wireless communication line 1, and performs wireless communication with the relay station 200-1.
  • the bandwidth request processing time calculation unit 104 transmits the time required from when the mobile terminal station 300 transmits the bandwidth request ranging code until the uplink radio resource corresponding to the bandwidth request ranging code is allocated to the mobile terminal station 300 (band request Processing time).
  • the bandwidth request processing time calculation unit 104 of the base station 100 in the multi-hop wireless communication system calculates the bandwidth request processing time in units of frames using Equation (1). As a result, the number of frames corresponding to the bandwidth request processing time is calculated.
  • MBRPD i is the minimum bandwidth request processing delay (MBRPD) of the base station when i is 0, and the minimum of the i-th relay station from the base station when i is 1 or more. This is a bandwidth request processing delay.
  • N is the number of hops from the base station to the mobile terminal station, and s is the number of hops from the mobile terminal station to the scheduling station.
  • MUFD i is the minimum uplink forwarding delay (MUFD) of the i-th relay station from the base station.
  • MDFD i is the minimum downlink forwarding delay (MDFD) of the i-th relay station from the base station.
  • the unit of minimum bandwidth request processing delay, minimum uplink transfer delay, and minimum downlink transfer delay is the number of frames.
  • the minimum bandwidth request processing delay is the number of the frame from which the scheduling station has received the bandwidth request ranging code, and the number of the frame from which the scheduling station transmits uplink radio resource allocation information (such as UL-MAP) for the bandwidth request ranging code. Is the minimum difference.
  • the minimum uplink transfer delay is the minimum value of the number of frames necessary for the relay station to receive uplink data from the lower station and transfer it to the upper station.
  • the minimum downlink transfer delay is the minimum value of the time (number of frames) required for the relay station to receive the downlink data from the upper station and transfer it to the lower station. For example, when downlink data received by a relay station from an upper station can be transmitted to a lower station in a frame subsequent to the received frame, the minimum downlink transfer delay of the relay station is 1.
  • the bandwidth request processing delay, the minimum uplink transfer delay, and the minimum downlink transfer delay may be fixed values within the system, or may be different values for each station. If fixed fixed values are used in the system as the bandwidth request processing delay, minimum uplink transfer delay, and minimum downlink transfer delay, the number of hops to which a message is transferred can be simplified based on the connection configuration of the devices in the system.
  • the bandwidth request processing time can be calculated by calculation.
  • the value is notified from the relay station to the base station by a MAC message.
  • the MAC message used for notification may be a MAC message used for notifying each other's capabilities in network entry processing, or may be a MAC message other than that.
  • the bandwidth request processing time for the mobile terminal station 300 will be described by taking as an example a case where the base station 100 uses distributed scheduling and the relay stations 200-1 and 200-2 use centralized scheduling.
  • the scheduling station of the mobile terminal station 300 is the relay station 200-1, n is 3, and s is 2.
  • the minimum bandwidth request processing delay (MBRPD 1 ) of the relay station 200-1 is 1, and the minimum uplink transfer delay (MUFD 2 ) and the minimum downlink transfer delay (MDFD 2 ) of the relay station 200-2. Are each 1.
  • the bandwidth request processing time for the mobile terminal station 300 is calculated according to the following equation.
  • FIG. 4 is a block diagram showing the configuration of the mobile terminal station 300.
  • the mobile terminal station 300 includes an upper layer processing unit 301, a wireless MAC processing unit 302, a wireless IF unit 303, a bandwidth request processing time management unit 304, and a power saving control unit 305.
  • the upper layer processing unit 301 performs protocol processing for upper layer communication using this multi-hop wireless communication system.
  • An example of the upper layer communication protocol is IP (Internet Protocol).
  • the wireless MAC processing unit 302 performs processing of the MAC layer of the mobile terminal station defined by the IEEE 802.16e standard and the IEEE 802.16j standard.
  • the MAC processing performed by the wireless MAC processing unit 302 includes conversion from an upper layer packet to MAC PDU and vice versa, connection management, network entry processing, message retransmission control, transmission queue management, and the like.
  • the wireless MAC processing unit 302 notifies the power saving control unit 305 of information regarding the sleep mode and the occurrence of an event.
  • Information on the sleep mode includes information on whether the mobile terminal station 300 is in the sleep mode, the listening period, and the sleep period.
  • An event that the wireless MAC processing unit 302 notifies the power saving control unit 305 includes the occurrence of uplink data.
  • the wireless MAC processing unit 302 when receiving a MAC message including a bandwidth request processing time for the mobile terminal station 300 from the base station 100, the wireless MAC processing unit 302 passes the MAC message to the bandwidth request processing time management unit 304.
  • the wireless IF unit 303 performs processing of the PHY layer of the mobile terminal station defined by the IEEE 802.16e standard and the IEEE 802.16j standard.
  • the wireless IF unit 303 is connected to the relay station 200-2 via the wireless communication line 1, and performs wireless communication with the relay station 200-2.
  • the wireless MAC processing unit 302 and the wireless IF unit 303 are provided with a function for realizing a power saving mode.
  • the wireless MAC processing unit 302 and the wireless IF unit 303 operate so as to reduce power consumption while the power saving mode is valid.
  • the wireless MAC processing unit 302 and the wireless IF unit 303 partially stop the operation of its own electronic circuit. Thereby, the power consumption of the mobile terminal station 300 is reduced.
  • the bandwidth request processing time management unit 304 transmits a time required from when the mobile terminal station 300 transmits a bandwidth request ranging code until an uplink radio resource corresponding to the bandwidth request ranging code is allocated to the mobile terminal station 300 (band request Information indicating the processing time is extracted from the MAC message received from the base station 100 and held.
  • the power saving control unit 305 instructs the electronic circuits constituting the wireless MAC processing unit 302 and the wireless IF unit 303 to start and cancel the power saving mode.
  • the power saving control unit 305 operates the entire electronic circuit during the listening period and puts the electronic circuit in the power saving mode during the sleep period.
  • the power saving control unit 305 performs predetermined control related to the power saving mode upon receiving notification of an event that uplink data has occurred during the sleep period. Specific control operations will be described later.
  • the power saving control unit 305 uses the bandwidth request processing time held by the bandwidth request processing time management unit 304 for controlling this power saving mode.
  • the multi-hop wireless communication system uses a REG-RSP (registration response) message for notification of bandwidth request processing time from the base station 100 to the mobile terminal station 300.
  • the REG-RSP message is a response message to a REG-REQ (registration request) message transmitted from the mobile terminal station 300 to the base station 100.
  • the REG-REQ message and the REG-RSP message are MAC messages defined by the IEEE 802.16e standard, and are used to register the mobile terminal station 300 with the base station 100 during network entry processing.
  • the wireless MAC processing unit 302 of the mobile terminal station 300 creates a REG-REQ message (step S101).
  • the wireless MAC processing unit 302 of the mobile terminal station 300 transmits the REG-REQ message created in step S101 to the relay station 200-2 via the wireless IF unit 303 (step S102).
  • the relay station 200-2 receives the REG-REQ message from the mobile terminal station 300 and transmits it to the relay station 200-1 (step S103).
  • Relay station 200-1 receives the REG-REQ message from relay station 200-2 and transmits it to base station 100 (step S104).
  • the base station 100 receives the REG-REQ message from the relay station 200-1, processes the message, calculates the bandwidth request processing time for the mobile terminal station 300, and creates a REG-RSP message (step S105). Details of the operation of the base station 100 will be described later.
  • the wireless MAC processing unit 102 of the base station 100 transmits the REG-RSP message created in step S105 to the relay station 200-1 via the wireless IF unit 103 (step S106).
  • Relay station 200-1 receives the REG-RSP message from base station 100 and transmits it to relay station 200-2 (step S107).
  • the relay station 200-2 receives the REG-RSP message from the relay station 200-1 and transmits it to the mobile terminal station 300 (step S108).
  • the mobile terminal station 300 receives the REG-RSP message from the relay station 200-2 and processes the message (step S109). Details of the operation of the mobile terminal station 300 will be described later.
  • steps S101 to S109 processes other than step S105 and step S109 are performed in accordance with the IEEE 802.16e standard and the IEEE 802.16j standard.
  • step S105 The operation of the base station 100 in step S105 will be described with reference to FIG.
  • the wireless MAC processing unit 102 of the base station 100 receives the REG-REQ message from the relay station 200-1 via the wireless IF unit 103 (step S121).
  • the wireless MAC processing unit 102 of the base station 100 performs the REG-REQ process received at step S121 (step S122).
  • the processing performed by the wireless MAC processing unit 102 is processing of the MAC layer of the base station.
  • the bandwidth request processing time calculation unit 104 of the base station 100 calculates the bandwidth request processing time for the mobile terminal station 300 based on the equation (1) (step S123). At that time, the bandwidth request processing time calculation unit 104 acquires the path information from the base station 100 to the mobile terminal station 300 and the scheduling method used by each relay station in the path information from the wireless MAC processing unit 102, Based on these, a scheduling station for the mobile terminal station 300 is determined. Further, the bandwidth request processing time calculation unit 104 calculates the minimum bandwidth request processing delay of the scheduling station, the minimum uplink transfer delay of the relay station between the scheduling station and the mobile terminal station 300, and the minimum downlink transfer delay of the wireless MAC. They are acquired from the processing unit 102 and used for calculating the bandwidth request processing time according to the equation (1).
  • the wireless MAC processing unit 102 of the base station 100 creates a REG-RSP message based on the IEEE 802.16e standard (step S124). At that time, the wireless MAC processing unit 102 includes the bandwidth request processing time for the mobile terminal station 300 calculated in step S123 in the REG-RSP message. At that time, the bandwidth request processing time is stored in the REG-RSP message in a TLV (Type Length Value) format.
  • TLV Type Length Value
  • Steps S121 and S122 are performed in accordance with the IEEE 802.16e standard and the IEEE 802.16j standard.
  • step S109 The operation of the mobile terminal station 300 in step S109 will be described with reference to FIG.
  • the wireless MAC processing unit 302 of the mobile terminal station 300 receives the REG-RSP message from the relay station 200-2 via the wireless IF unit 303 (step S131).
  • the wireless MAC processing unit 302 of the mobile terminal station 300 processes the REG-RSP message received in step S131 (step S132).
  • the process performed by the wireless MAC processing unit 302 is the process of the MAC layer of the mobile terminal station.
  • the bandwidth request processing time management unit 304 of the mobile terminal station 300 extracts the bandwidth request processing time from the REG-RSP message received in step S131 (step S133).
  • the bandwidth request processing time management unit 304 of the mobile terminal station 300 stores the bandwidth request processing time acquired in step S133 (step S134).
  • Step S131 and step S132 are performed in accordance with the IEEE 802.16e standard.
  • the wireless MAC processing unit 302 of the mobile terminal station 300 receives the uplink (UL) data from the upper layer processing unit 301, and performs MAC processing such as MAC PDU conversion on the uplink data (step S141). At that time, the wireless MAC processing unit 302 notifies the power saving control unit 305 of an event that uplink data has occurred.
  • the power saving control unit 305 of the mobile terminal station 300 Upon receiving the event notification, the power saving control unit 305 of the mobile terminal station 300 instructs the electronic circuits constituting the wireless MAC processing unit 302 and the wireless IF unit 303 to cancel the power saving mode (step S142). .
  • the wireless MAC processing unit 302 of the mobile terminal station 300 transmits a bandwidth request ranging code via the wireless IF unit 303 (step S143). At that time, the wireless MAC processing unit 302 stores the start time of the wireless frame that transmitted the band request ranging code.
  • the band request ranging code transmitted by the mobile terminal station 300 is processed by the relay station 200-2, the relay station 200-1, and the base station 100, and the processing is performed according to the IEEE 802.16e standard and the IEEE 802.16j standard. Detailed description thereof will be omitted.
  • the power saving control unit 305 of the mobile terminal station 300 starts the power saving mode for the electronic circuits constituting the wireless MAC processing unit 302 and the wireless IF unit 303. An instruction is given (step S144).
  • the power saving control unit 305 of the mobile terminal station 300 acquires the bandwidth request processing time for the mobile terminal station 300 from the bandwidth request processing time management unit 304 (step S145).
  • the power saving control unit 305 of the mobile terminal station 300 checks whether or not the bandwidth request processing time has elapsed from the time T given by the equation (2) (step S146).
  • F start is the start time of the radio frame that transmitted the band request ranging code in step S143.
  • T wakeup is a time required until the electronic circuits constituting the wireless MAC processing unit 302 and the wireless IF unit 303 cancel the power saving mode and become ready to send and receive messages and the like.
  • CheckInterval is a time interval in which the determination process in step S146 is repeated.
  • the power saving control unit 305 acquires F start from the wireless MAC processing unit 302. It is assumed that T wakeup and CheckInterval are given in advance to the power saving control unit 305.
  • the power saving control unit 305 acquires the time per frame from the wireless MAC processing unit 302.
  • the power saving control unit 305 of the mobile terminal station 300 performs power saving mode for the electronic circuits constituting the wireless MAC processing unit 302 and the wireless IF unit 303. Is released (step S147).
  • step S148 the power saving control unit 305 of the mobile terminal station 300 waits for CheckInterval (step S148), and then repeats the processing in step S146.
  • Steps S141 and S143 are performed in accordance with the IEEE 802.16e standard and the IEEE 802.16j standard.
  • the mobile terminal station can know the bandwidth request processing time. That is, the base station provides information on the scheduling station for the mobile terminal station, the relay station between the scheduling station and the mobile terminal station, and the minimum bandwidth request processing delay, the minimum uplink transfer delay, and the minimum downlink transfer delay of each station. This is because the bandwidth request processing time is calculated for the mobile terminal station, and is included in the MAC message and transmitted to the mobile terminal station.
  • the power efficiency of the mobile terminal station can be improved. This is because the mobile terminal station refers to the bandwidth request processing time to place the wireless transmission / reception circuit in the power saving mode after transmitting the bandwidth request ranging code until receiving the wireless resource allocation corresponding to the request. is there.
  • a multi-hop wireless communication system having two relay stations is illustrated.
  • the number of relay stations may be one or less or three or more.
  • the present invention is not limited to this.
  • Other MAC messages may be used for notifying the mobile terminal station of the bandwidth request processing time.
  • the bandwidth request processing time for a mobile terminal station is performed when the mobile terminal station connects to a base station via a relay station.
  • the present invention is not limited to this.
  • the base station may recalculate the bandwidth request processing time for the mobile terminal station and notify the mobile terminal station.
  • a new base station may calculate a bandwidth request processing time for the mobile terminal station and notify the mobile terminal station of the calculation.
  • the base station calculates the bandwidth request processing time for the mobile terminal station.
  • the relay station may calculate the bandwidth request processing time for the mobile terminal station.
  • the relay station may have the same function as the bandwidth request processing time calculation unit of the base station. Then, from the base station to the relay station, the scheduling station for the mobile terminal station, the relay station between the scheduling station and the mobile terminal station, and the minimum bandwidth request processing delay, the minimum uplink transfer delay, and the minimum downlink transfer delay of each station This information may be notified. Also, instead of notifying all of this information, the mobile terminal station may be notified of some information or other parameters capable of calculating the bandwidth request processing time.
  • Other parameters that make it possible to calculate the bandwidth request processing time are, for example, the number of hops from the mobile terminal station to the scheduling station. Notification of these pieces of information from the base station to the relay station can be realized by the base station transmitting a MAC message including these pieces of information to the relay station.
  • the mobile terminal station may calculate the bandwidth request processing time for the local station.
  • the mobile terminal station may have the same function as the bandwidth request processing time calculation unit of the base station. Then, from the base station to the mobile terminal station, a scheduling station for the mobile terminal station, a relay station between the scheduling station and the mobile terminal station, and a minimum bandwidth request processing delay, a minimum uplink transfer delay, and a minimum downlink transfer of each station Basic information for calculating the bandwidth request processing time including delay may be notified.
  • a part of information or other parameters capable of calculating the bandwidth request processing time may be notified to the mobile terminal station.
  • Other parameters that can calculate the bandwidth request processing time are, for example, the number of hops from the mobile terminal station to the scheduling station.
  • the notification of information from the base station to the mobile terminal station can be realized by the base station transmitting a MAC message including such information to the mobile terminal station.
  • the present invention when transmitting a bandwidth request ranging code, an example in which power saving control of a wireless transmission / reception circuit is performed in consideration of bandwidth request processing time has been shown.
  • the present invention is not limited to this.
  • the same power saving control may be performed when a bandwidth request is transmitted.
  • a processing time from when a mobile terminal station requests a radio resource until a radio resource is allocated is calculated and the processing time is notified to the mobile terminal station.
  • the present invention is not limited to this.
  • the processing time from when a relay station transmits a message requesting radio resources until the relay station receives a radio resource allocation message corresponding to the request is calculated, and the processing time is relayed. You may decide to notify a station.
  • the multi-hop wireless communication system appropriately determines the bandwidth request retransmission interval based on the bandwidth request processing time, thereby avoiding unnecessary bandwidth request retransmission and preventing deterioration of frequency utilization efficiency.
  • the basic configuration of the multi-hop wireless communication system according to the second embodiment is the same as that of the first embodiment shown in FIG. Therefore, the description is omitted here.
  • the basic configuration of the base station 100 of the multi-hop wireless communication system according to the second embodiment is the same as that of the first embodiment shown in FIG. Therefore, the description is omitted.
  • FIG. 9 shows the configuration of the mobile terminal station 300 of the multi-hop wireless communication system according to the second embodiment.
  • the mobile terminal station 300 includes an upper layer processing unit 301, a wireless MAC processing unit 302, a wireless IF unit 303, a bandwidth request processing time management unit 304, and a bandwidth request retransmission interval calculation unit 306.
  • the upper layer processing unit 301, the wireless MAC processing unit 302, the wireless IF unit 303, and the bandwidth request processing time management unit 304 of the mobile terminal station 300 of the multi-hop wireless communication system according to the second embodiment are the same except for the points described below. 4 has the same functions as the components of the mobile terminal station 300 of the multi-hop wireless communication system according to the first embodiment shown in FIG.
  • the bandwidth request processing time management unit 304 of the mobile terminal station 300 of the multi-hop wireless communication system receives the bandwidth request processing time from the base station 100 in addition to the functions in the first embodiment, The request retransmission interval calculation unit 306 is notified of the bandwidth request processing time.
  • the bandwidth request retransmission interval calculation unit 306 of the mobile terminal station 300 of the multi-hop wireless communication system receives the bandwidth request processing time from the bandwidth request processing time management unit 304 and considers the bandwidth request processing time.
  • the bandwidth request retransmission interval suitable for use by the mobile terminal station 300 is calculated and set in the wireless MAC processing unit 302.
  • the bandwidth request retransmission interval is set to be longer than the bandwidth request processing time, the average processing delay in each device and each line in spite of each device operating normally and processing the bandwidth request Due to the average transmission delay, the bandwidth request retransmission interval timer times out and the bandwidth request ranging code is not retransmitted.
  • the bandwidth request retransmission interval calculation unit 306 calculates the bandwidth request retransmission interval using Equation (3).
  • Bandwidth request retransmission interval Bandwidth request processing time x ⁇ + ⁇ (3)
  • ⁇ and ⁇ are system constants. ⁇ and ⁇ may be given in advance to the mobile terminal station 300, or may be given from the base station 100 or the relay station 200-2 by a MAC message or the like.
  • the unit of the bandwidth request retransmission interval is the number of frames.
  • the mobile terminal station 300 When receiving the REG-RSP message including the bandwidth request processing time from the base station 100, the mobile terminal station 300 performs the operation shown in FIG. 10 in addition to the operation in the first embodiment.
  • the bandwidth request processing time management unit 304 of the mobile terminal station 300 notifies the bandwidth request processing time to the bandwidth request retransmission interval calculation unit 306 (step S201).
  • the bandwidth request retransmission interval calculation unit 306 of the mobile terminal station 300 calculates the bandwidth request retransmission interval using Equation (3) (step S202).
  • the bandwidth request retransmission interval calculation unit 306 of the mobile terminal station 300 sets the bandwidth request retransmission interval calculated in step S202 in the wireless MAC processing unit 302 (step S203).
  • the wireless MAC processing unit 302 of the mobile terminal station 300 receives the uplink (UL) data from the upper layer processing unit 301, and performs MAC processing such as MAC PDU conversion on the uplink data (step S211).
  • the wireless MAC processing unit 302 further transmits a bandwidth request ranging code via the wireless IF unit 303 (step S212). At that time, the wireless MAC processing unit 302 stores the start time of the wireless frame that transmitted the band request ranging code.
  • the wireless MAC processing unit 302 receives the UL-MAP through the wireless IF unit 303 (step S213).
  • the wireless MAC processing unit 302 checks whether or not the CDMA Allocation IE corresponding to the bandwidth request ranging code transmitted in step S212 is included in the UL-MAP received in step S213 (step S214). If the CDMA Allocation IE corresponding to the bandwidth request ranging code transmitted by itself is included in the UL-MAP, the wireless MAC processing unit 302 can determine that the wireless resource requested by the own device has been allocated.
  • the mobile terminal station 300 ends the bandwidth request processing by the bandwidth request ranging code.
  • the subsequent processing of the mobile terminal station 300 is performed in accordance with the IEEE 802.16e standard.
  • the wireless MAC processing unit 302 transmits the bandwidth request retransmission code last time after transmitting the bandwidth request ranging code. It is confirmed whether or not the time corresponding to has elapsed (step S215).
  • the wireless MAC processing unit 302 proceeds to step S212 and retransmits the bandwidth request ranging code. If the bandwidth request retransmission interval has not elapsed, the wireless MAC processing unit 302 proceeds to step S213 and continues monitoring the wireless resource allocation status.
  • the frequency use efficiency of the multi-hop wireless communication system can be increased. This is because the mobile terminal station 300 suppresses unnecessary retransmissions by determining the message retransmission interval for bandwidth request in consideration of the bandwidth request processing time.
  • the mobile terminal station 300 calculates the message retransmission interval for bandwidth request.
  • the present invention is not limited to this.
  • the base station 100 or the relay station 200 may calculate a message retransmission interval for bandwidth request, and notify the mobile terminal station 300 of the result by a MAC message or the like. This can be realized by providing the base station 100 or the relay station 200 with the same function as the bandwidth request retransmission interval calculation unit 306 of the mobile terminal station 300.
  • a Contention-based reservation timeout field of a UCD (UL channel descriptor) message defined in the IEEE 802.16e standard. is there.
  • the retransmission interval is determined in consideration of the bandwidth request processing time when transmitting the bandwidth request ranging code, but the present invention is limited to this. is not.
  • the retransmission interval may be determined in consideration of the bandwidth request processing time.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un système de communication sans fil à sauts multiples dans lequel une station de base ou une quelconque station de relais fait office de station d'ordonnancement en vue d'effectuer de façon centrale les allocations de ressources radio de la station de base et de tout ou partie des stations de relais. Le système de communication sans fil à sauts multiples comprend un moyen de génération d'informations de temps de traitement et un moyen de notification d'informations de temps de traitement. Le moyen de génération d'informations de temps de traitement génère, en fonction de la structure de connexion entre un appareil de communication et la station de base ou entre l'appareil de communication et une station de relais, une information de temps de traitement indiquant un temps de traitement entre le moment où l'appareil de communication demande une ressource radio auprès de la station d'ordonnancement jusqu'à ce que la ressource radio soit allouée depuis la station d'ordonnancement à l'appareil de communication. Le moyen de notification d'informations de temps de traitement notifie l'appareil de communication de l'information de temps de traitement obtenu par le moyen de génération d’informations de temps de traitement.
PCT/JP2010/056525 2009-07-08 2010-04-12 Système de communication sans fil à sauts multiples, appareil de gestion, appareil de communication et procédé de commande WO2011004645A1 (fr)

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Publication number Priority date Publication date Assignee Title
JPWO2013076898A1 (ja) * 2011-11-25 2015-04-27 日本電気株式会社 無線局、及び無線局によるユーザーデータの処理方法
US9549415B2 (en) 2011-11-25 2017-01-17 Nec Corporation Radio station and method of processing user data with radio station
US9560542B2 (en) 2011-11-25 2017-01-31 Nec Corporation Radio station and method of processing user data with radio station
US9622260B2 (en) 2011-11-25 2017-04-11 Nec Corporation Radio station and method of processing user data with radio station
US10085169B2 (en) 2011-11-25 2018-09-25 Nec Corporation Radio station and method of processing user data with radio station
US10091806B2 (en) 2011-11-25 2018-10-02 Nec Corporation Radio station and method of processing user data with radio station
US10154508B2 (en) 2011-11-25 2018-12-11 Nec Corporation Radio station and method of processing user data with radio station
US10244548B2 (en) 2011-11-25 2019-03-26 Nec Corporation Radio station and method of processing user data with radio station
US10608470B2 (en) 2012-10-29 2020-03-31 Apple Inc. Receiver for an inductive power transfer system and a method for controlling the receiver
US11470634B2 (en) * 2018-01-18 2022-10-11 Intel Corporation Apparatuses, devices and methods for a wireless network access device, a network gateway device, a wireless communication device and for a network device

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