WO2006006230A1 - パケット転送方法、無線アクセス局、基地局制御装置、および無線基地局 - Google Patents
パケット転送方法、無線アクセス局、基地局制御装置、および無線基地局 Download PDFInfo
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- WO2006006230A1 WO2006006230A1 PCT/JP2004/009929 JP2004009929W WO2006006230A1 WO 2006006230 A1 WO2006006230 A1 WO 2006006230A1 JP 2004009929 W JP2004009929 W JP 2004009929W WO 2006006230 A1 WO2006006230 A1 WO 2006006230A1
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- time
- timed
- base station
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
- H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Definitions
- Radio access station Packet transfer method, radio access station, base station controller, and radio base station
- the present invention relates to a packet transfer method, and more particularly, to a packet transfer method for a packet that requires real-time performance.
- Patent Document 1 JP-A-2002-64474, page 2, page 1, page 1
- the packet with the fast arrival time and the late packet have the same priority. Is sending in degrees.
- packets that arrive late cannot be preferentially processed.
- processing cannot be performed in time and discarded, and radio resources can be used effectively.
- radio resources can be used effectively.
- the present invention has been made in view of the above, and when transferring a bucket that requires real-time performance, the priority of packet transmission is determined based on the arrival time of the packet, and the packet that becomes invalid is determined.
- An object of the present invention is to obtain a packet transfer method, a radio access station, a base station control device, and a radio base station that can reduce the number of packets and can effectively use radio resources by discarding useless packets.
- a packet transfer method in which a radio access station transmits a packet transmitted from a fixed terminal to a mobile device, wherein the fixed terminal adds a packet generation time to the packet to be transmitted.
- the wireless access station transmits a packet to the mobile device based on the reception time when the packet with time is received and the packet generation time in the packet with time. It is characterized by being determined.
- the fixed terminal transmits a timed packet with a packet generation time added to the packet to be transmitted, and the wireless access station receives the timed packet and the packet generation time in the timed packet. Based on the above, the priority for transmitting timed packets to the mobile station is determined, so even if the mobile station receives the packet, it can reduce the number of packets that are discarded because the codec processing is not in time. .
- FIG. 1 is a diagram showing a configuration of a communication system to which a packet transfer method according to a first embodiment of the present invention is applied. (Embodiment 1)
- FIG. 2 is a block diagram showing a configuration of the fixed terminal shown in FIG. (Embodiment 1) [FIG. 3]
- FIG. 3 is a block diagram showing a configuration of the radio access station shown in FIG. (Mode 1)
- FIG. 4 is a block diagram showing a configuration of a retransmission control section shown in FIG. (Embodiment 1)
- FIG. 5 is a block diagram showing a configuration of the mobile device shown in FIG. 1.
- (Embodiment 1) [FIG. 6]
- FIG. 6 is a diagram showing a packet format handled by the communication system of Embodiment 1.
- the (Embodiment 1) is a diagram showing a packet format handled by the communication system of Embodiment 1.
- FIG. 7 is a diagram for explaining the operation of the communication system of the first embodiment. (Implemented ⁇
- FIG. 8 is a diagram for explaining the operation of the communication system of the first embodiment. (Embodiment 1)
- FIG. 9 is a diagram showing a configuration of a communication system to which the packet transfer method according to the second embodiment of the present invention is applied. (Embodiment 2)
- FIG. 10 is a block diagram showing a configuration of the base station control apparatus shown in FIG. (Embodiment 2)
- FIG. 11 is a diagram showing a format of a transfer packet transmitted from the base station control device to the radio base station. (Embodiment 2)
- FIG. 12 is a block diagram showing a configuration of the radio base station shown in FIG. (Mode 2)
- FIG. 13 is a block diagram showing a configuration of the retransmission control unit shown in FIG. (Embodiment 5)
- FIG. 1 is a diagram showing a configuration of a communication system to which the packet transfer method according to the first embodiment of the present invention is applied.
- the communication system according to the first embodiment includes a mobile device 101, a radio access station 102, a wired network 103, and a fixed terminal 104.
- FIG. 1 only the mobile device 101 is accommodated in the radio access station 102, but actually, a plurality of mobile devices (not shown) are accommodated in the radio access station 102.
- FIG. 2 is a block diagram showing a configuration of fixed terminal 104 shown in FIG.
- the fixed terminal 104 generates a codec signal by performing a coding process on voice and images, and a decoding process on the codec signal, and a control unit 501 that controls each component in the fixed terminal 104 in an integrated manner. Interface functions of the codec unit 502 that reproduces audio and images, the packet control unit 503 that packetizes the codec signal generated by the codec unit 502, the time control unit 504 that measures time, and the wired network 103 And a wired signal transmission / reception unit 505 for performing packet transmission / reception processing.
- FIG. 3 is a block diagram showing a configuration of radio access station 102 shown in FIG.
- the wireless access station 102 includes a control unit 401 that comprehensively controls each component in the wireless access station 102, and a wired signal transmission / reception unit 402 that performs transmission / reception processing of the wired network 103 with an interface function.
- the packet scheduling control unit 403 that controls the schedule for transmitting and receiving packets over the radio, the time control unit 404 that measures the time, and the packet scheduling control unit 403 transmit the packet to the mobile device 101 according to instructions from the packet scheduling control unit 403.
- a retransmission control unit 405 that performs packet retransmission processing when a packet cannot be transmitted normally, and a radio signal transmission / reception unit 406 that performs coding / decoding processing and modulation / demodulation processing for wireless packet transmission / reception ing.
- FIG. 4 is a block diagram showing a configuration of retransmission control section 405 shown in FIG.
- the retransmission control unit 4005 includes a plurality of (here, three) queues 901-903 for accumulating packets.
- the queue 901 stores packets to be transmitted with the highest priority
- the queue 902 stores real-time packets
- the queue 903 stores best-fauto packets.
- FIG. 5 is a block diagram showing a configuration of mobile device 101 shown in FIG.
- the mobile device 101 includes a control unit 601 that comprehensively controls each component in the mobile device 101, a wireless signal transmission / reception unit 602 that performs code * decoding processing and modulation / demodulation processing for wirelessly transmitting and receiving packets , The ability to receive a packet from the wireless access station 102 and receive the packet normally, and in this case, the retransmission control unit 603 that performs retransmission processing, and the arrival fluctuation of the packet is absorbed, and the codec signal is received from the received packet. And a codec unit 605 that performs decoding processing on the codec signal and reproduces voice and images.
- FIG. 6 shows a packet handled by the communication system of the first embodiment (in the scope of claims).
- An example of the format of a packet with time) is shown.
- a packet 301 shown in FIG. 6 is an IP (Internet Protocol) packet, which is an example of a real-time packet for realizing a streaming service.
- the knot 301 includes an IP header 302, a UDP header 303, an RTP header 304, and a payload 305 in which codec signals such as voice and video are set.
- the packet generation time is set in the RTP header 304.
- the codec section 502 of the fixed terminal 104 generates a codec signal by performing coding processing on the voice.
- the codec unit 502 outputs the generated codec signal to the packet control unit 503.
- the packet control unit 503 of the fixed terminal 104 packetizes the codec signal. Specifically, as shown in FIG. 6, the packet control unit 503 sets a codec signal in the payload 305, adds an RTP header 304, a UDP header 303, and an IP header 302, and generates a packet 301. To do. The packet control unit 503 acquires the current time from the time control unit 504, and sets the acquired current time in the time stamp in the RTP header 304 as the packet generation time. The packet control unit 503 outputs the generated packet 301 to the wired signal transmission / reception unit 505.
- the wired signal transmission / reception unit 505 transmits the packet 301 to the wired network 103. Bucket 301 arrives at radio access station 102.
- the wired signal transmission / reception unit 402 of the wireless access station 102 receives the packet 301 and outputs the received packet 301 to the packet scheduling control unit 403.
- the packet scheduling control unit 403 acquires the current time (reception time ij when the packet 301 was received) from the time control unit 404.
- the packet scheduling control unit 403 compares the acquired current time with the packet generation time set in the RTP header 304 of the packet 301, and determines the priority for transmitting the packet 301 based on the comparison result.
- the wireless access station 102 is fixed. In order for the packet 301 received from the fixed terminal 104 to arrive at the mobile station 101 within a predetermined time, it is necessary to transmit the packet within the radio access station transmission timing limit at which the radio access station 102 transmits the packet 301.
- the radio access station transmission timing limit is the limit at which the radio access station 102 transmits the packet 301 so that the packet arrives at the mobile station 101 by the time required to process the packet 301 received by the mobile station 101. It's time.
- the packet scheduling control unit 403 compares the delay time with a predetermined threshold, and determines the priority for transmitting the packet so that the packet 301 is transmitted before the radio access station transmission timing limit.
- the packet scheduling control unit 403 compares the reception time with the packet generation time set in the RTP header 304 of the packet 301, and performs packet transfer from the fixed terminal 104 to its own device. Find the delay time.
- the packet scheduling control unit 403 compares the obtained delay time with a predetermined threshold value. When the delay time is larger than the threshold (when the difference between the reception time and the radio access station transmission timing limit is small), the packet scheduling control unit 403 retransmits the received packet in time for the codec processing at the mobile station 101. Store in the highest priority queue 901 of the control unit 405. That is, by transmitting the packet 301 that arrives late (large delay time) with the highest priority, the time from when the device receives the packet until it is transmitted is shortened.
- the packet scheduling control unit 403 stores the received packet in the real-time packet queue 902.
- the retransmission control unit 405 determines the packet transmission order according to the queues of the queues 901 to 903 and extracts the packets from the queues 901 to 903. The retransmission control unit 405 obtains the current time from the time control unit 404 and determines whether or not the packet taken out from the queue 901 903 can be transmitted within the wireless access station transmission timing limit. [0029] When packet 301 can be transmitted within the radio access station transmission timing limit, retransmission control section 405 transmits the packet to the radio line via radio signal transmission / reception section 406. If the packet 301 cannot be transmitted within the radio access station transmission timing limit, the retransmission control unit 405 determines that the mobile device 101 cannot execute the codec processing even if the packet 301 is transmitted, and the packet is not transmitted. Discard.
- Radio signal transmission / reception section 602 of mobile apparatus 101 outputs received packet 301 to retransmission control section 603.
- the retransmission control unit 603 determines whether the packet 301 has been normally received by a checksum included in the IP header 302 of the received packet 301. When the packet 301 is not normally received, the retransmission control unit 603 executes a retransmission process. When packet 301 is normally received, retransmission control section 603 outputs packet 301 to packet control section 604.
- the packet control unit 604 performs buffering to absorb fluctuation of arrival of the packet 301.
- the buffering is, for example, a predetermined fixed time, and is a time obtained by adding a fixed time from the time when the first bucket 301 is received. Note that the buffering time may be changed in consideration of actual fluctuations.
- the packet control unit 604 extracts a codec signal from the payload 305 of the packet 301 after buffering, and outputs the extracted codec signal to the codec unit 605.
- the codec unit 605 reproduces audio by performing decoding processing on the codec signal.
- FIG. 7 shows the flow of packets to fixed terminal 104, radio access station 102, and mobile device 101.
- the fixed terminal transmission timing 701a is indicated by the time of the time control unit 504 of the fixed terminal 104
- the radio access station reception timing 701b and the radio access station transmission timing limit 701c are the time control unit of the radio access station 102.
- This is indicated by the time of 404.
- the difference between the time of the time control unit 504 of the fixed terminal 104 and the time of the time control unit 404 of the radio access station 102 is 100 ms
- the time of the time control unit 504 of the fixed terminal 104 and the time control unit of the mobile device 101 The difference from the time of 607 is 200ms.
- the fixed terminal 104 power packet 702a is transmitted at time Oms (SI).
- Oms is set as the packet generation time. If the transfer delay time of packet 702a to wireless access station 102 is 15ms, wireless access station 102 receives the packet.
- IJ is 115ms (AR1).
- the transfer delay time of packet 702b transmitted by fixed terminal 104 at time 20ms (S2) is 10 ms
- the transfer delay time of packet 702c transmitted by fixed terminal 104 at time 40ms (S3) is 25 ms. If the transfer delay time of packet 702d transmitted by fixed terminal 104 at 60 ms (S4) is 10 ms, radio access station 102 receives packet 702b at time 130 ms (AR2) and packet 702c at time 165 ms (AR3). Receives bucket 702d at time 170ms (AR4).
- the buffering time for fluctuation absorption at mobile station 101 is fixed to 20 ms after the first packet is received. Specifically, if fixed terminal 104 transmits packet 702a with iJOms set as the packet generation time, and if it takes 20 ms to reach mobile device 101, mobile device 101 receives the packet at time 220ms.
- the codec process starts at 240ms.
- the time 240 ms when the codec unit 605 of the mobile device 101 starts processing the packet 702a becomes the mobile device reception timing limit 701d indicating the limit at which the mobile device 101 can process the packet.
- the mobile station reception timing limit 701d of the packets 702a, 702b, 702c, and 70 2d is 240ms, 260ms, 280ms, and 300ms at the time of the time control unit 607 of the mobile station 101.
- the wireless access station 102 that has received the packets 702a-702d must transmit the received packets 702a-702d as packets 703a-703d so that the mobile device 101 can receive the packets before the mobile device reception timing limit 701d. .
- the radio access station 102 has a fixed 20 ms (the buffering time of the mobile device 101 and the discarding condition as claimed in the claims) at the time when the mobile device 101 transmitted the packet 702a that was normally received first.
- the mobile station 101 can determine the radio access station transmission timing limit 701c for receiving the packets 703a and 703d by the mobile station reception timing limit 701d.
- the radio access station 102 can determine the radio access station transmission timing limit 701c based on this fixed time. it can. However, if the buffering time is different for each mobile station 101, or considering the actual fluctuation, In the case of changing halfway, the wireless access station transmission timing limit 701c cannot be determined by the fixed time. In such a case, the mobile station 101 should notify the radio access station 102 of the buffering time when it determines or changes the buffering time.
- the control unit 601 of the mobile device 101 transmits a packet notifying the buffering time to the radio access station 102 via the radio signal transmitting / receiving unit 602, and the radio signal transmitting / receiving unit 406 of the radio access station 102 transmits this packet.
- the buffering time is notified to the control unit 401 of the wireless access station 102.
- the control unit 401 notifies the packet scheduling control unit 403 of the notified buffering time.
- the packet scheduling control unit 403 of the radio access station 102 can determine the radio access station transmission timing limit 701c.
- the wireless access station transmission timing limit 701c for packet 702a is 135 (AS 1)
- the wireless access station transmission timing limit for packet 702b is 155 (AS2)
- the wireless access station transmission timing limit for packet 702c is 701c. It is assumed that 701c is 175 (AS3) and the wireless access station transmission timing limit 701c of packet 702d is 195 (AS4).
- the packet scheduling control unit 403 performs wireless access of the packet 702c.
- the difference between the station reception timing 701b and the wireless access station transmission timing limit 701c is detected to be 10 ms, and the packet 702c is output to the highest priority queue 901 of the retransmission control unit 405.
- the packet 702c stored in the highest priority queue 901 is transmitted to the mobile device 101 with the highest priority.
- the transfer delay time of the packet 702c to the fixed terminal 104 power wireless access station 102 is 37 ms.
- the wireless access station reception timing 701b of packet 702c is 177ms (AR3) at time lJ, which exceeds the time 175 (AS2) of the wireless access station transmission timing limit 701c.
- the packet scheduling control unit 403 discards the packet 702c exceeding the wireless access station transmission timing limit 701c.
- fixed terminal 104 adds a packet generation time to a packet, and radio access station 102 transmits a packet based on the packet reception time and the packet generation time. Until the wireless access station 102 receives the packet When the delay time is obtained and the delay time is larger than a predetermined threshold, the priority for transmitting the packet is increased, so that even if the mobile station 101 receives the packet, the codec processing is not in time. Packets to be discarded can be reduced.
- the mobile device 101 notifies the wireless access station 102 of a discard condition for discarding the discarded packet without being able to perform codec processing, and the wireless access station 102 receives the discard condition, the reception time when the packet is received, Even if transmission is performed based on the packet generation time, packets that are discarded by the mobile device 101 are determined, and packets that are determined to be discarded by the mobile device 101 are discarded so that useless packets are not transferred. Wireless resources can be used effectively.
- fixed terminal 104 transmits packet 301 to wireless access station 102 via wired network 103, and wireless access station 102 performs priority control of packet 301 to perform mobile terminal 101.
- the present invention is not limited to this.
- the fixed terminal 104 may be provided with a wireless line interface function, and the communication between the fixed terminal 104 and the wireless access station 102 may be performed wirelessly.
- the terminal that receives the streaming service from the fixed terminal 104 is not limited to the mobile device 101, and may be a terminal device connected to a wired network. In this case, if a packet transfer apparatus having the same function as the wireless access station 102 is installed between the fixed terminal 104 and the terminal apparatus, useless packets are not transmitted on the network, and network traffic is prevented. Can be raised.
- a second embodiment of the present invention will be described with reference to FIG. 9 and FIG.
- the case where the wireless access station is connected to the wired network has been described.
- this Embodiment 2 a case will be described in which a base station controller is connected to a wired network, and the base station controller controls a radio base station connected to the base station controller.
- FIG. 9 is a diagram showing a configuration of a communication system to which the packet transfer method according to the second embodiment that is useful for the present invention is applied.
- the communication system according to the second embodiment includes a base station controller 202 and a radio base station 201 instead of the radio access station 102 of the communication system according to the first embodiment shown in FIG.
- Components having the same functions as those of the first embodiment shown in FIG. Minutes are denoted by the same reference numerals, and redundant description is omitted.
- FIG. 10 is a block diagram showing a configuration of base station control apparatus 202 shown in FIG.
- the base station control device 202 includes a control unit 1101 that comprehensively controls each component in the base station control device 202, a wired signal transmission / reception unit 1102 that has an interface function of the wired network 103, and that transmits and receives packets.
- a packet scheduling information setting unit 1103 that generates information for controlling a transmission schedule, a time control unit 1104 that measures time, and a radio base station that has an interface function with the radio base station 201 and performs packet transmission / reception processing It is equipped with a station interface B 1105.
- FIG. 11 shows a format of a transfer packet that the base station controller 202 transmits to the radio base station 201.
- a transfer packet 1201 shown in FIG. 11 is an example of a real-time packet for realizing a streaming service.
- scheduling information 1202 set by the packet scheduling information setting unit 1103 of the base station control apparatus 202 is added to the packet 301 shown in FIG.
- the scheduling information 1202 a transmission condition when the radio base station 201 transmits the packet 301 is set.
- priority information for specifying a queue to be temporarily stored when the radio base station 201 transmits the packet 301 is set.
- FIG. 12 is a block diagram showing a configuration of radio base station 201 shown in FIG.
- the radio base station 201 includes a control unit 1001 that controls each component in the radio base station 201 and a base station control device interface unit that has an interface function with the base station control device 202 and performs packet transmission / reception processing. 1002 and a code for transmitting / receiving data by radio, and a retransmission control unit 1003 that transmits a packet to mobile station 101 based on the packet scheduling information and performs retransmission control when the packet cannot be transmitted normally.
- FIG. 13 is a block diagram showing a configuration of retransmission control section 1003 shown in FIG.
- Retransmission control unit 1003 includes a plurality of (in this case, three) queues 1301 1303 for determining a packet transmission schedule.
- the queue 1301 stores packets to be transmitted with the highest priority
- the queue 1302 stores real-time packets
- the queue 1303 stores best F auto packets. That is, the priority of the queue 1303 having the highest priority is the queue 1303. It is getting the lowest.
- the codec unit 502 of the fixed terminal 104 generates a codec signal by performing coding processing on the voice, and the packet control unit 503 sets the codec signal in the payload 305, and the time control unit in the RTP header 304 A packet 301 in which the packet generation time acquired from 504 is set is generated and output to the wired network 103 via the wired signal transmission / reception unit 505.
- the packet 301 output from the fixed terminal 104 to the wired network 103 arrives at the base station control device 202.
- the wired signal transmission / reception unit 1102 of the base station control apparatus 202 receives the packet 301 and outputs the received packet 301 to the packet scheduling information setting unit 1103.
- the packet scheduling information setting unit 1103 of the base station control device 202 acquires the current time (reception time) from the time control unit 1104.
- the packet scheduling information setting unit 1103 determines whether or not the received packet 301 can be transmitted within the transmission timing limit based on the acquired current time. If the packet 301 cannot be transmitted within the transmission timing limit, the packet scheduling information setting unit 1103 discards the received packet 301.
- the packet scheduling information setting unit 1103 determines the scheduling of the packet 301 based on the acquired current time and the packet generation time of the packet 301. Then, the determined scheduling information is set in the scheduling information 1202 and added to the packet 301 to generate a transfer packet 1201 (see FIG. 11).
- the scheduling information attached to the scheduling information 1202 by the packet scheduling information setting unit 1103 of the base station controller 202 is, for example, a priority or non-priority real data.
- This is information indicating the time and best F auto. That is, this is information for specifying the queues 1301 to 1303 of the retransmission control section 1003 of the radio base station 201. Since the time at which the packet 301 must arrive from the fixed terminal 104 to the mobile station 101 is determined, if the delay time until the packet 301 arrives at the base station controller 202 from the fixed terminal 104 increases, transmission will start from the reception time. The difference from the timing limit is small. Since the setting of the transmission timing limit is the same as the setting of the radio access station transmission timing limit described in Embodiment 1, the description thereof is omitted here.
- the packet scheduling information setting unit 1103 waits until the packet 301 arrives at the base station control device 202 from the fixed terminal 104 based on the packet generation time of the packet 301 and the current time acquired from the time control unit 1104. Find the delay time.
- the packet scheduling information setting unit 1103 compares the obtained delay time with a predetermined threshold value.
- the packet scheduling information setting unit 1103 sets “priority” in the scheduling information 1202.
- the packet scheduling information setting unit 1103 sets “non-priority real time” in the scheduling information.
- the radio access station reception timing 701b in FIG. 7 is set as the reception timing in the base station controller 202
- the radio access station transmission timing limit 701c in FIG. 7 is set as the transmission timing limit in the radio base station 201. If the difference between the transmission timing limit time at the radio base station 201 and the reception timing time at the base station controller 202 is 704a-704d, the packet (delay time is 10 ms) or less (Priority) is set in the scheduling information 1202 of the transfer packet 1201 generated from the packet) larger than the threshold, and the transmission timing limit time at the radio base station 201 and the reception timing at the base station controller 202 are set.
- Non-priority real time is set in the scheduling information 1202 of the transfer packet 1201 generated from the packets 702a, 702b, and 702d, and the scheduling information 1202 of the transfer packet 1201 generated from the packet 702c is set. Set to “Priority”.
- the packet scheduling information setting unit 1103 transmits the generated transfer packet to the radio base station 201 via the radio base station interface unit 1105.
- the retransmission control unit 1003 of the radio base station 201 determines transmission scheduling of the transfer packet 1201 based on the scheduling information 1202 of the transfer packet 1201 received via the base station control device interface unit 1002. Specifically, the forwarding packet 1201 with “priority” set in the scheduling information 1 202 is accumulated in the queue 1301, and the forwarding packet 1201 with “non-priority real-time” set in the scheduling information 1202 is stored. The packet 1301 is stored in the queue 1302, and the forwarding packet 1201 is stored in the queue 1303 with “best F auto” set in the scheduling information 1202. The retransmission control unit 1003 schedules the queue 130 1 with priority over the queues 1302 and 1303.
- retransmission control section 1003 Based on predetermined scheduling, retransmission control section 1003 extracts transfer packet 1201 stored in queues 1301-1303, and transmits / receives radio signal packet 301 in which scheduling information 1202 is deleted from read transfer packet 1201. Transmit to mobile station 101 via unit 1004.
- the packet 301 output from the radio base station 201 to the radio channel arrives at the mobile device 101.
- the retransmission control unit 603 of the mobile device 101 determines whether or not the packet 301 received via the radio signal transmission / reception unit 602 has been normally received, and the packet control unit 604 determines whether the packet 301 has been normally received. Is extracted from the payload 305, and the codec unit 605 performs decoding processing on the codec signal to reproduce the sound.
- the fixed terminal 104 adds the packet generation time to the packet, and the base station controller 202 transmits the packet based on the packet reception time and the packet generation time.
- the base station controller 202 obtains a delay time from when the packet is transmitted until the packet is received. If the delay time is greater than a predetermined threshold, the radio base station 201 is set so as to increase the priority for transmitting the packet.
- Wireless base station 201 transmits packets according to the notified priority, so even if mobile station 101 receives the packet without wireless base station 201 examining the packet contents, codec processing is performed. Can reduce the number of packets discarded in time.
- information specifying a queue is added as scheduling information 1202, but a grace time until transmission is completed may be set.
- the radio base station 201 stores the reception time when the packet is received from the base station controller 202, and the retransmission control unit 1003 determines that the grace time of the scheduling information 1202 is greater than a predetermined threshold. Accumulates the packet 301 in the queue 1302 assigned to the non-prioritized real-time packet, and accumulates the packet 301 in the queue 1301 assigned with the highest priority when the grace time of the scheduling information 1202 is less than the threshold.
- the packet 301 when the packet 301 is read for transmission, it is determined whether or not the grace time is exceeded based on the current time and the reception time, and the packet 301 within the grace time is transmitted via the radio signal transmitting / receiving unit 1004. The packet 301 transmitted to the mobile station 101 and exceeding the grace time is discarded.
- the terminal that receives the streaming service from the fixed terminal 104 is not limited to the mobile device 101, and may be a terminal device connected to a wired network.
- the packet transfer control device and the packet transfer device having the same functions as those of the base station control device 202 and the radio base station 201 are installed between the fixed terminal 104 and the terminal device, it is useless on the network. Traffic can be increased without sending packets.
- the packet transfer method according to the present invention is useful for transferring packets that require real-time performance, and is particularly suitable for streaming services in wireless communication.
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PCT/JP2004/009929 WO2006006230A1 (ja) | 2004-07-12 | 2004-07-12 | パケット転送方法、無線アクセス局、基地局制御装置、および無線基地局 |
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JP5721912B1 (ja) * | 2014-03-27 | 2015-05-20 | 三菱電機株式会社 | 無線通信品質情報処理装置及び通信システム |
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Cited By (4)
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JP5721912B1 (ja) * | 2014-03-27 | 2015-05-20 | 三菱電機株式会社 | 無線通信品質情報処理装置及び通信システム |
WO2015145673A1 (ja) * | 2014-03-27 | 2015-10-01 | 三菱電機株式会社 | 無線通信品質情報処理装置及び通信システム |
CN105210349A (zh) * | 2014-03-27 | 2015-12-30 | 三菱电机株式会社 | 无线通信品质信息处理装置及通信系统 |
CN105210349B (zh) * | 2014-03-27 | 2017-03-29 | 三菱电机株式会社 | 无线通信品质信息处理装置及通信系统 |
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