Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/0446—Resources in time domain, e.g. slots or frames
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
  • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
  • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
  • H04L1/1829—Arrangements specially adapted for the receiver end
  • H04L1/1854—Scheduling and prioritising arrangements
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
  • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
  • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
  • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0078—Timing of allocation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L2001/0092—Error control systems characterised by the topology of the transmission link
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/16—Performing reselection for specific purposes
  • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

• Mobile station base station, mobile communication system, and communication method
• the present invention relates to a mobile station, a base station, a mobile communication system, and a communication method.
• the present invention can be applied to a radio communication system that performs radio packet transmission in the uplink such as Evolved UTRA and 4th generation mobile radio communication system.
• Evolved UTRA defined by the International Standards Organization (3GPP)
• 3GPP International Standards Organization
• Macro diversity that combines packets between different base stations (between cells) or between different sectors within the same base station is one of the important technologies for improving the data rate and frequency efficiency at the cell edge.
• the data rate at the cell edge can be increased by about 10% to 15% compared to the time of hard handover.
• Non-Patent Document 1 3PPG TR 25.896
• a mobile station is a serving base station (main base station).
• packet scheduling and hybrid ARQ (HARQ: Hybrid Automatic Repeat reQuest) control are performed based on the downlink downlink channeling channels received from a plurality of cell sites. That is, the downlink signal from the serving base station A nulling channel and a downlink sided channel from a non-serving base station are equivalent in terms of packet scheduling and hybrid ARQ, and are not distinguished.
• packet scheduling and hybrid ARQ control are performed by handling all signaling channels from multiple base stations equally.
• control related to packets such as HARQ and packet scheduling is performed at the base station, and the mobile station receives such information from a plurality of base stations, and controls HARQ and packet scheduling. Do not perform! /, And do not receive the benefits of handover. Therefore, it is necessary to receive two signals simultaneously.
• the state of simultaneous reception from these two base stations is called the soft handover state.
• the mobile station performs handover when the average reception level difference (path loss difference) between the two base station powers becomes small enough to fall within a certain threshold.
• the one with the higher average reception level at that time is the serving base station, and the one with the higher average reception level is the non-serving base station.
• the base station with the highest reception level is the serving base station, and the other base stations are non-serving base stations.
• an associated dedicated physical channel (Associated DPC H) is required. Since the Associated DPCH needs to be transmitted even if there is no transmission data for a certain period of time, the base station must simultaneously receive the same number of associated dedicated physical channels (Associated DPCH) as W—CDMA.
• the non-serving base station assigns data channels to other handover users. Therefore, the serving base station performs the data channel demodulation processing only on the mobile station that has assigned the data channel transmission, but the non-serving base station assigns the mobile base station to the mobile station. Datach In addition to channel demodulation processing, the non-serving base station itself must demodulate the data channel assigned to other mobile stations as a serving base station, and it must receive signals from two users.
• the present invention has been made in view of the above problems, and provides a mobile station, a base station, a mobile communication system, and a communication method capable of simplifying the simultaneous reception of multiple stations in the uplink. Objective.
• a mobile station transmits a data transmission request transmission unit that transmits a data transmission request and a transmission timing notified from a serving base station to the serving station.
• One of the features is a transmission timing notifying unit for notifying the base station and the non-serving base station, and a data transmitting unit for transmitting data to the serving base station and the non-serving base station based on the transmission timing. .
• the mobile station can notify the serving base station and the non-serving base station of the transmission timing, and can transmit data according to the transmission timing.
• the base station of the present invention determines transmission timing based on scheduling performed in response to a data transmission request from a mobile station, and notifies the mobile station of the transmission timing.
• One of the features is that a determination unit and a reception unit that receives data according to the transmission timing are provided.
• scheduling can be performed for the mobile station, transmission timing can be determined, and data can be received according to the transmission timing.
• another base station of the present invention includes a receiving unit that receives data according to a transmission timing in which mobile station power is also notified, and a decoding unit that performs decoding when an error in the data is not detected. And a packet transfer unit for transferring data to the serving base station of the mobile station.
• the mobile communication system of the present invention is a mobile comprising a serving base station, a non-serving base station, and a mobile station that performs a handover between the serving base station and the non-serving base station.
• the mobile station notifies the serving base station and the non-serving base station of a data transmission request transmitting unit that transmits a data transmission request and a transmission timing notified from the serving base station.
• a data transmission unit that transmits data to the serving base station and the non-serving base station based on the transmission timing, and the serving base station responds to a data transmission request from a mobile station. Scheduling to determine the transmission timing and to notify the mobile station of the transmission timing.
• a receiving unit that receives data according to the transmission timing, wherein the non-serving base station receives data according to the transmission timing notified by the mobile station, and the data
• the non-serving base station receives data according to the transmission timing notified by the mobile station, and the data
• the mobile station can notify the serving base station and the non-serving base station of the transmission timing, and can transmit data according to the transmission timing.
• the serving base station can schedule the mobile station to determine the transmission timing, and can receive data according to the transmission timing.
• the non-serving base station can receive data according to the transmission timing, and can transfer the decoded data to the serving base station when no data error is detected.
• the communication method of the present invention includes a serving base station, a non-serving base station, a mobile station that performs a node over between the serving base station and the non-serving base station,
• a communication method in a mobile communication system comprising: a data transmission request transmission step for transmitting a data transmission request; and a transmission timing notified from a serving base station, the serving base station and a non-serving base station.
• the non-serving base station in accordance with the transmission timing notified by the mobile station, receives a data reception step, detects an error in the data, and detects an error in the data. And a packet transfer step of transferring the decoded data to the serving base station.
• the mobile station can notify the serving base station and the non-serving base station of the transmission timing, and can transmit data according to the transmission timing.
• the serving base station can schedule the mobile station to determine the transmission timing, and can receive data according to the transmission timing.
• the non-serving base station can receive data according to the transmission timing, and can transfer the decoded data to the serving base station when no data error is detected.
• the mobile station performs control based only on the signaling channel from the serving base station.
• FIG. 1 is an explanatory diagram showing a soft handover state.
• FIG. 2 is an explanatory diagram showing a mobile communication system according to an embodiment of the present invention.
• FIG. 3 is a block diagram showing a W-CDMA mobile communication system.
• FIG. 4 is a block diagram showing a mobile station that works in one embodiment of the present invention.
• FIG. 5A is a block diagram showing a serving base station according to an embodiment of the present invention.
• FIG. 5B is a block diagram showing a non-serving base station according to an embodiment of the present invention.
• FIG. 6 is a sequence diagram showing the operation of the mobile communication system according to one embodiment of the present invention.
• the mobile communication system 10 includes a mobile station 100, a base station 200, and a base station.
• the mobile station 100 is in a soft handover state between the serving base station 200 and the non-serving base station 200, and the serving base station 200 and the non-serving base station 200 are in a soft handover state.
• mobile station 100 has one base station, that is, scheduling control in which data channel transmission allocation is performed to each mobile station by serving base station 200 and a packet in which a decoding error has occurred in the base station. Is retransmitted.
• Serving base station 200 performs scheduling !, and when a user is assigned, combination of transmission timing indicating data transmission timing and modulation scheme / channel coding rate (MCS) channel coding scheme) is notified to the mobile station 100 as reservation information.
• MCS channel coding rate
• the mobile station 100 Upon receiving the reservation information from the serving base station SOC ⁇ , the mobile station 100 has been allocated to the serving base station 200 and the non-serving base station 200 by the accompanying control channel, for example, the accompanying dedicated physical channel. Confirmation information to confirm, transmission timing,
• the mobile station 100 transmits data to the serving base station 200 and the non-serving base station 200 through the data channel according to the transmission timing.
• Non-serving base station 200 only decodes received packets and receives HARQ.
• Non-serving base station 200 transfers the packet to serving base station 200.
• Non-serving base station 200
• Serving base station 200 performs demodulation and decoding processing on the received data channel, and if it cannot be received correctly, it temporarily stores it in a buffer and stands by. Serving base station 200 sends a packet that is transmitted when non-serving base station 200 power is received correctly.
• retransmission processing is performed on the mobile station.
• the serving base station SOC ⁇ performs a process of transmitting retransmission request information to the mobile station 100.
• a retransmission process is a series of processes from when a base station performs a packet decoding process and when a decoding error is detected, until the base station transmits retransmission request information to the mobile station and the mobile station retransmits the same packet. This is the process.
• the serving base station 200 and the non-serving base station 200 perform HARQ processing, and retransmitted packets and previously received decoding error generated packets.
• a process of combining the ket is performed.
• the downlink control channel (feedback signaling) is transmitted only from serving base station 200 and received by mobile station 100.
• Non-serving base station 200 is transmitted only from serving base station 200 and received by mobile station 100.
• the non-serving base station 200 also has control information indicating a retransmission request to the mobile station 100.
• the mobile station 100 Since the mobile station 100 that does not need to receive the feedback channel does not need to receive feedback channels from multiple sites at the same time, it receives and retransmits the downlink control channel. Control can be simplified.
• the serving base station performs scheduling! And notifies the mobile station and the non-serving base station of the allocation information.
• the mobile station transmits a data channel according to the allocation information.
• the transmitted data channel is received by both base stations, and demodulation and decoding processes are performed by both base stations. As a result, if it is correctly received by either one of the base stations, it can be combined by the upper station, so the retransmission process is not performed. Retransmission processing is performed only when both base stations receive it in error. In this case, information on both base station capabilities ACKZNACK is notified to the mobile station.
• the non-serving base station 200 receives an ACK / NA.
• CK information is not sent to the mobile station 100.
• Mobile station 100 is connected to data transmission request transmission unit 102, control unit 104 as a transmission timing notification unit connected to data transmission request transmission unit 102, and control unit 104.
• a data transmission unit 106 is connected to data transmission request transmission unit 102, control unit 104 as a transmission timing notification unit connected to data transmission request transmission unit 102, and control unit 104.
• Data transmission request transmission section 102 transmits a data transmission request to serving base station 200 when transmission data is generated.
• the control unit 104 notifies the serving base station 200 and the non-serving base station 200 of the transmission timing at which the serving base station 200 power is also notified.
• the data transmission unit 106 transmits data to the serving base station 200 and the non-serving base station 200 based on the transmission timing at which the serving base station 200 power is also notified.
• Serving base station 200 ⁇ includes receiving section 202, control section 204 connected to receiving section 202, selective combining section 206 and retransmission request notifying section 208 connected to control section 204.
• Receiving section 202 performs error detection by performing demodulation and decoding processing on the packet transmitted from mobile station 100.
• the receiving unit 202 combines retransmission packets when receiving retransmission packets.
• the control unit 204 waits for a predetermined time and receives a packet frame or IP packet that is correctly received by the non-serving base station. Check whether or not. Non-serving base station 200 packets received correctly even after waiting for the predetermined time, or IP packets
• This predetermined time includes the distance between the serving base station 200 and the non-serving base station 200, and the transmission rate.
• the processing delay increases when passing through multiple upper stations.
• the predetermined time is determined in advance based on the state of the route.
• the retransmission request notification unit 208 notifies the mobile station 100 of a retransmission request in accordance with a command indicating that a retransmission request is sent from the control unit 204.
• the selection combining unit 206 is a packet frame in which the non-serving base station 200 power is also transmitted,
• the packet is selectively combined.
• the selection combining unit 206 performs selection combining when a decoded packet frame or IP packet is received.
• the non-serving base station 200 includes a receiving unit 210 and a control unit 212 connected to the receiving unit 210.
• a packet transfer unit 214 connected to the control unit 212.
• Receiving section 210 performs demodulation and decoding processing of the packet transmitted from mobile station 100 and performs error detection.
• the receiving unit 202 combines retransmission packets when receiving retransmission packets.
• the control unit 212 waits if the packet received by the reception unit 210 includes an error, and waits for demodulation and decoding without including an error. Or the IP packet as a unit is transferred to the serving base station 200 via the packet transfer unit 214.
• the packet transfer unit 214 is an L2 (Layer 2) address (for example, a MAC (Medium Access Control) address) in units of an IP packet in which a packet frame that has been correctly demodulated and decoded or a plurality of packet frames is combined.
• L2 Layer 2
• the data is transferred to the serving base station 200 via a wired transmission path (backhaul) using an L3 (Layer 3) address (for example, an IP address).
• the packet transfer unit 214 may transfer the packet directly to the serving base station 200 or via a higher station.
• the serving base station 200 and the non-serving base station 200 for the mobile station 100 are identical to each other.
• Data transmission request transmitting section 102 of mobile station 100 transmits information indicating that there is transmission data to serving base station 200 (step S602).
• Serving base station 200 performs scheduling to control unit 204 (step S604). If the serving base station 200 has assigned to the handover user, the serving base station 200 transmits reservation information to the handover user (step S606).
• This reservation information includes allocation information indicating allocation to the handover user, for example, allocation time slot, frequency information, transmission timing indicating the transmission timing of the shared data channel, and information such as MCS. In this way, the mobile station can know that it has been assigned.
• the mobile station 100 Upon receiving the reservation information, the mobile station 100, in the control unit 104, the allocation confirmation information (Acknowledge information) for confirming the allocation by the associated control channel, for example, the associated dedicated physical channel (Associated DPCH). , Information indicating transmission timing, MCS, etc. is transmitted to the serving base station 200 and the non-serving base station 200.
• the allocation confirmation information Acknowledge information
• Associated DPCH associated dedicated physical channel
• Information indicating transmission timing, MCS, etc. is transmitted to the serving base station 200 and the non-serving base station 200.
• Step S608, Step S610 By notifying the transmission timing before transmitting the shared data channel in this manner, the non-serving base station 200 can
• This accompanying dedicated physical channel for example, a common accompanying physical channel is used.
• This common accompanying physical channel is shared among handover users and is commonly used among users.
• This common accompanying physical channel is a set of individual channels that are used in common.
• the user can select one of subframes, time multiplexing for changing users for each packet, frequency multiplexing for multiplexing in the frequency domain, and code multiplexing for changing the code so that a plurality of users can use it. Multiplexed by the method.
• an associated dedicated physical channel may be used. When using this accompanying dedicated physical channel, use a separate channel, or use a common channel.
• Multiplexing methods between common channels include the time multiplexing, frequency multiplexing, and code multiplexing described above.
• Mobile station 100 transmits data through the shared data channel according to the transmission timing (steps S612 and S614).
• the transmitted data is received by the serving base station 200 and the non-serving base station 200.
• the serving base station 200 and the non-serving base station 200 recover the received packet.
• the non-serving base station 200 decodes the packet if it can be correctly demodulated and decoded. Forward the packet frame or the combined IP packet to the serving base station 200 ⁇ . As described above, it is one of the features of the present invention that the packet frame or IP packet correctly decoded by the non-serving base station is transferred to the serving base station.
• Non-serving base station 200 does nothing if the packet cannot be decoded correctly.
• the serving base station 200 correctly receives the packet frame received from the non-serving base station 200 or the combined IP packet.
• the non-serving base station 200 corrects the packet when it cannot receive the packet correctly.
• the serving base station 200 may be notified of information indicating that it has been difficult to receive. By doing in this way, the serving base station 200 can quickly perform retransmission control based on the packet reception result at the serving base station 200.
• packet scheduling is executed only between the mobile station and the serving base station. Therefore, the non-serving base station does not need to transmit feedback information to the mobile station by simply decoding the shared data channel.
• the non-serving base station is notified of the reception timing of the shared data channel of the mobile station power and the MCS information via a control channel that accompanies in advance, such as an associated dedicated physical channel (Associated DPC H).
• a UE (User Equipment) ID indicating a user performing transmission, transmission timing, and MCS information may be received in advance by a common associated physical channel.
• the control unit 104 notifies the transmission timing and the mobile station identification code (UE ID) via a control channel used in common among a plurality of mobile stations. Since the UE ID is included, the corresponding user can be identified by the non-serving base station 2002 even using a control channel that is commonly used among a plurality of users.
• the non-serving base station 200 receives the subsequent shared data channel and decodes (retransmits).
• the shared data channel is not a circuit switching but a packet mode transmission
• the number of received cards for example, the number of boards in the non-serving base station 200 should not be so large.
• a mobile station can obtain a macro diversity gain equivalent to that of a soft node over without requiring simultaneous reception of feedback channels from a plurality of sites.
• best-f-automatic simultaneous multi-station reception (Complementary HHO) in the uplink can be realized.
• the mobile station, base station, mobile communication system, and communication method according to the present invention can be applied to a mobile communication system.

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

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• 2005
  • 2005-08-23 JP JP2005241907A patent/JP4837957B2/ja not_active Expired - Lifetime
• 2006
  • 2006-08-21 EP EP20060796605 patent/EP1919228B1/en active Active
  • 2006-08-21 US US12/064,578 patent/US8634404B2/en active Active
  • 2006-08-21 KR KR20087005423A patent/KR101358616B1/ko not_active Expired - Fee Related
  • 2006-08-21 EP EP20130164459 patent/EP2618621A3/en not_active Withdrawn
  • 2006-08-21 ES ES06796605T patent/ES2422454T3/es active Active
  • 2006-08-21 CN CN2006800365790A patent/CN101278573B/zh active Active
  • 2006-08-21 WO PCT/JP2006/316342 patent/WO2007023772A1/ja not_active Ceased
  • 2006-08-22 TW TW95130808A patent/TWI351846B/zh active
• 2013
  • 2013-12-13 US US14/105,260 patent/US20140098800A1/en not_active Abandoned

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