JP2008270931A - Wireless access point and wireless relay method of real-time communication packet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique which is suitable for wireless relay of real-time communication packets. <P>SOLUTION: A wireless access point 1 receives an RTP (real-time transport protocol) packet 6 which makes a wireless IP telephone set 3 as a destination, and stores real-time data, such as voice data, image data, etc., from an IP telephone set 2 through a LAN 4. The point extracts and stores the real-time data from a payload from the received RTP packet 6, and unifies it in the order of sequence number of the RTP packet 6. By the way, it creates integrated real-time data 7. Moreover, the wireless access point 1 monitors the congestion condition of the wireless LAN 5. When the wireless LAN 5 is not in a congestion condition, it reconstructs the RTP packet 8 which stores the integrated real-time data 7, and transmits the RTP packet 8 to the wireless IP telephone set 3 via the wireless LAN 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless access point technique, and more particularly to a wireless relay technique for a real-time communication packet storing real-time data such as audio data and video data.

  Patent Document 1 discloses a wireless access point (base station apparatus) that can make use of the original transmission rate and can efficiently transmit packets. The wireless access point sorts packets received from the wired network into priority QoS packets and other general packets, and stores the sorted priority QoS packets. Then, the stored QoS packet is encapsulated, and is transmitted as a capsule packet to the wireless network in accordance with the CODEC cycle.

JP 2004-128603 A

  When the QoS packet is a real-time communication packet storing real-time data such as audio data and video data, according to the wireless access point described in Patent Document 1, a plurality of packet headers of the real-time communication packet are included in the payload of the capsule packet As a result, the ratio of real-time data in the capsule packet is reduced. For this reason, the overhead increases and the communication band cannot be used effectively.

  Further, as described above, the wireless access point described in Patent Document 1 transmits the capsule packet to the wireless network in alignment with the CODEC cycle. For this reason, packet loss may occur on the wireless network due to congestion, and in this case, multiple real-time communication packets stored in the capsule packet will be lost at once, affecting the reproduction of real-time data. there is a possibility.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique suitable for wireless relay of real-time communication packets.

  In order to solve the above problems, in the present invention, real-time data stored in a real-time communication packet received from a wired network is accumulated, and the accumulated real-time data is integrated in order of sequence number or time stamp of the real-time communication packet. . The integrated real-time data is reconstructed into one real-time communication packet and transmitted to the wireless network.

For example, the present invention is a wireless access point that relays between wired and wireless networks,
Wired network connection means for connecting to the wired network;
Wireless network connection means for connecting to the wireless network;
Real-time data stored in the real-time communication packet received from the wired network via the wired network connection means is accumulated for each set of transmission source and destination of the real-time communication packet, and the sequence number of the real-time communication packet Real-time data storage / integration means to integrate in order or time stamp order,
Real-time data that is stored and integrated for each set of transmission source and destination by the real-time data storage / integration means is converted into a real-time communication packet for each set and transmitted from the wireless network connection means to the wireless network Communication packet reconstructing means.

  The wireless access point may further include wireless transmission timing determination means for determining the wireless transmission timing of the communication packet based on the congestion state of the wireless network. When the wireless transmission timing determining means determines that the wireless transmission timing is the wireless transmission timing, the integrated real-time data is converted into a real-time communication packet, and the wireless network connection means It may be transmitted to the wireless network.

  In the present invention, since a plurality of real-time communication packets are reconstructed into one real-time communication packet, the overhead due to the packet header is reduced, and the communication band can be effectively utilized. Also, by determining the wireless transmission timing of the real-time communication packet based on the congestion state of the wireless network, the transmission interval and packet size of the real-time communication packet can be changed according to the congestion state of the wireless network. Thus, the frequency of packet loss on the wireless network can be reduced, and the influence of packet loss can be reduced. Thus, according to the present invention, it is possible to provide a technique suitable for wireless relay of real-time communication packets.

  Embodiments of the present invention will be described below.

  FIG. 1 is a conceptual diagram for explaining the operating principle of the wireless access point 1 according to the embodiment of the present invention.

  In FIG. 1, a wireless access point 1 is an RTP (Real-Time Transport) that is a real-time communication packet that stores real-time data such as audio data and video data from the IP telephone 2 via the LAN 4 to the wireless IP telephone 3. Protocol) packet 6 is received. Then, real-time data is extracted from the payload of the received RTP packet 6 and stored, and is integrated in the order of the sequence numbers of the RTP packet 6. Thereby, the integrated real-time data 7 is generated.

  The wireless access point 1 monitors the congestion state of the wireless LAN 5. When the wireless LAN 5 is not congested, the RTP packet 8 storing the integrated real-time data 7 is reconstructed, and the RTP packet 8 is transmitted to the wireless IP telephone 3 via the wireless LAN 5.

  FIG. 2 is a schematic diagram of the wireless access point 1 according to the embodiment of the present invention.

  As illustrated, the wireless access point 1 according to the present embodiment includes a LAN interface unit 11, a wireless LAN interface unit 12, an uplink relay unit 13, and a downlink relay unit 14.

  The LAN interface unit 11 is an interface for connecting to the LAN 4. The LAN interface unit 11 receives a LAN frame transmitted on the LAN 4 and extracts an IP packet from the LAN frame. Then, the extracted IP packet is transferred to the downlink relay unit 14. Further, the LAN interface unit 11 stores the IP packet received from the upstream relay unit 13 in a LAN frame and sends it over the LAN 4.

  The wireless LAN interface unit 12 is an interface for connecting to the wireless LAN 4. The wireless LAN interface unit 12 receives a wireless LAN frame transmitted on the wireless LAN 5 and extracts an IP packet from the wireless LAN frame. Then, the extracted IP packet is transferred to the upstream relay unit 13. Further, the IP packet received from the downlink relay unit 14 is stored in a wireless LAN frame and transmitted (wireless transmission) on the wireless LAN 5.

  The upstream relay unit 13 relays (bridges) the IP packet received from the wireless LAN interface unit 12 to the LAN interface unit 11.

  The downlink relay unit 14 relays (bridges) IP packets other than the IP packet storing the RTP packet 6 among the IP packets received from the LAN interface unit 11 to the wireless LAN interface unit 12. Of the IP packets received from the LAN interface unit 11, for the IP packet storing the RTP packet 6, real-time data is extracted from the RTP packet 6 stored in the IP packet and stored, and the sequence number of the RTP packet is stored. Integrate in order. Then, the RTP packet 8 storing the integrated real-time data 7 generated thereby is reconstructed, an IP packet storing the reconstructed RTP packet 8 is generated, and passed to the wireless LAN interface unit 12.

  FIG. 3 is a schematic diagram of the downlink relay unit 14.

  As shown in the figure, the downlink relay unit 14 includes an IP packet distribution unit 141, an IP packet storage unit 142, a real-time data storage / integration unit 143, a storage unit 144, an IP packet relay unit 145, an RTP packet re-transmission unit. A construction unit 146, an IP packet reconstruction unit 147, a priority assignment unit 148, and a transmission timing determination unit 149 are included.

  The IP packet sorting unit 141 analyzes the IP packet received from the LAN interface unit 11 and determines whether the IP packet stores an RTP packet. If it is determined that the RTP packet is stored, the IP packet is transferred to the real-time data storage / integration unit 143. On the other hand, if it is determined that no RTP packet is stored, the IP packet is transferred to the IP packet storage unit 142.

  The IP packet storage unit 142 stores the IP packet received from the IP packet sorting unit 141 in an IP packet buffer 1441 provided in the storage unit 144. Here, the configuration of the IP packet buffer 1441 is a FIFO (First In First Out) configuration.

  The real-time data storage / integration unit 143 extracts real-time data from the RTP packet 6 stored in the IP packet received from the IP packet sorting unit 141. Then, the extracted real-time data is stored in the real-time data buffer 1442 provided in the storage unit 144 in association with the pair of the transmission source and the destination of the RTP packet 6. Further, the accumulated real-time data is integrated in the order of sequence numbers of RTP packets.

  The IP packet relay unit 145 extracts the IP packet from the IP packet buffer 1441 and passes it to the wireless LAN interface unit 12.

  The RTP packet restructuring unit 146 takes out real-time data (integrated real-time data 7) integrated in the order of sequence numbers of RTP packets from any of the real-time data buffers 1442. Then, the integrated real-time data 7 is stored, the RTP packet 8 having the transmission source and the destination associated with the real-time data buffer 1442 as the transmission source and the destination is reconstructed and passed to the IP packet reconstruction unit 147. .

  The IP packet reconstructing unit 147 reconstructs the UDP packet storing the RTP packet 8 received from the RTP packet reconstructing unit 146, further reconstructs the IP packet storing the UDP packet, and sends it to the wireless LAN interface unit 12. hand over.

  The priority assigning unit 148 calculates a priority for each real-time data buffer 1442 provided in the storage unit 144 based on the data capacity and the buffer duration, and assigns the priority to the target real-time data buffer 1442. This priority determines the order in which the RTP packet reconstruction unit 146 reconstructs RTP packets.

  The transmission timing determination unit 149 monitors the congestion state of the wireless LAN 5 by carrier sense or the like, and determines whether it is the wireless transmission timing. Specifically, it is determined that it is the wireless transmission timing when the wireless LAN 5 is not congested.

  Next, processing for relaying packets on the LAN 4 to the wireless LAN 5 for the wireless access point 1 having the above configuration will be described.

  Note that the process of relaying the packet on the wireless LAN 5 to the LAN 4 is the same as the process at the existing wireless access point, and thus detailed description thereof is omitted.

  FIG. 4 is a flowchart for explaining the LAN frame reception processing of the wireless access point 1. This flow is started when the LAN interface unit 11 receives a LAN frame from the LAN 4.

  First, the LAN interface unit 11 extracts an IP packet from the received LAN frame, and passes it to the IP packet sorting unit 141 (S401).

  Next, the IP packet sorting unit 141 determines whether the packet stored in the IP packet received from the LAN interface unit 11 is a UDP packet (S402). When the packet is not a UDP packet (NO in S402), the IP packet sorting unit 141 passes this IP packet to the IP packet storage unit 142. In response to this, the IP packet storage unit 142 stores the IP packet received from the IP packet sorting unit 141 in the IP packet buffer 1441 (S413).

  Further, when the packet stored in the IP packet received from the LAN interface unit 11 is a UDP packet (YES in S402), the IP packet sorting unit 141 determines that the packet stored in the UDP packet is the RTP packet 6 Is further examined (S403). When it is not the RTP packet 6 (NO in S403), the IP packet sorting unit 141 passes this IP packet to the IP packet storage unit 142. In response to this, the IP packet storage unit 142 stores the IP packet received from the IP packet sorting unit 141 in the IP packet buffer 1441 (S413).

  When the packet stored in the IP packet received from the LAN interface unit 11 is a UDP packet storing the RTP packet 6 (YES in S403), the IP packet sorting unit 141 converts the IP packet into real-time data. The data is passed to the storage / integration unit 143. In response to this, the real-time data storage / integration unit 143 extracts the UDP packet from the IP packet received from the IP packet sorting unit 141, and further extracts the RTP packet 6 from the extracted UDP packet (S404).

  Next, the real-time data storage / integration unit 143 acquires transmission source information, destination information, and a sequence number from the header of the extracted RTP packet 6 (S405).

  Then, the real-time data accumulation / integration unit 143 checks whether or not the real-time data buffer 1442 having attribute information including the acquired transmission source information and destination information is provided in the storage unit 144 (S406). When a real-time data buffer 1442 having attribute information including the acquired transmission source information and destination information is provided in the storage unit 144 (YES in S406), the real-time data storage / integration unit 143 stores the real-time data buffer 1442 It is further checked whether or not there is a real-time data buffer 1442 having attribute information including the sequence number immediately before the acquired sequence number (S407). When there is a real-time data buffer 1442 having attribute information including the sequence number immediately before the acquired sequence number (YES in S407), the real-time data storage / integration unit 143 updates the real-time data buffer 1442 to be updated. Set to. Then, real-time data is extracted from the extracted payload of the RTP packet 6 and connected to the end of the real-time data held in the real-time data buffer 1442 to be updated. As a result, the extracted real-time data is accumulated and integrated in the real-time data buffer 1442 to be updated (S408). Further, the real-time data storage / integration unit 143 updates the sequence number included in the attribute information of the real-time data buffer 1442 to be updated to the sequence number acquired in S405 (S409).

  On the other hand, when the real-time data buffer 1442 having attribute information including the acquired transmission source information and destination information is not provided in the storage unit 144 (NO in S406), or attribute information including the acquired transmission source information and destination information If there is no real-time data buffer 1442 having attribute information including the sequence number immediately before the acquired sequence number (NO in S407), the real-time data storage / integration unit 143 has the storage unit 144 A real-time data buffer 1442 is newly provided. Then, real-time data is extracted from the payload of the extracted RTP packet 6 and stored in the new real-time data buffer 1442 (S410). Further, the real-time data storage / integration unit 143 registers the transmission source information, destination information, and sequence number acquired in S405 in the attribute information of the new real-time data buffer 1442 (S411). Further, the real-time data storage / integration unit 143 sets a buffer duration timer in the attribute information of the new real-time data buffer 1442, and starts measuring the elapsed time since the real-time data buffer 1442 is provided (S412).

  FIG. 5 is a flowchart for explaining the wireless LAN frame transmission processing of the wireless access point 1.

  First, the RTP packet reconstruction unit 146 monitors the transmission timing determination unit 149 and waits for the determination result to be a transmission timing (S501).

  Next, the RTP packet restructuring unit 146 checks whether or not the real-time data buffer 1442 is provided in the storage unit 144 (S502). When the real-time data buffer 1442 is not provided in the storage unit 144 (NO in S502), the RTP packet reconstruction unit 146 instructs the IP packet relay unit 145 to relay the IP packet. In response to this, the IP packet relay unit 145 checks whether IP packets are stored in the IP packet buffer 1441 (S514). If accumulated (YES in S514), the IP packet relay unit 145 takes out the oldest accumulated IP packet from the IP packet buffer 1441, and passes it to the wireless LAN interface unit 12 (S515). The wireless LAN interface unit 12 stores the IP packet received from the IP packet relay unit 145 in the wireless LAN frame and transmits it to the wireless LAN 5 (S516).

  On the other hand, when the real time data buffer 1442 is provided in the storage unit 144 (YES in S502), the RTP packet reconstruction unit 146 further checks whether or not a plurality of real time data buffers 1442 are provided in the storage unit 144 ( S503).

  When a plurality of real-time data buffers 1442 are provided in the storage unit 144 (YES in S503), the RTP packet reconstruction unit 146 instructs the priority assignment unit 148 to update the priority. In response to this, the priority assigning unit 148 updates the priorities of the respective real-time data buffers 1442 provided in the storage unit 144 (S504 to S509).

  First, the priority assigning unit 148 selects one unselected real-time data buffer 1442 (S504). Next, the priority assigning unit 148 determines whether or not the timer value of the buffer duration timer set in the attribute information of the selected real-time data buffer 1442 is equal to or greater than a predetermined time (S505). (YES in S505), the priority registered in the attribute information of the selected real-time data buffer 1442 is incremented by one (S506). Here, when the priority is not registered in the attribute information of the selected real-time data buffer 1442, the priority of the initial value is registered in this attribute information. Further, the priority assigning unit 148 determines whether or not the data size of the real-time data held in the selected real-time data buffer 1442 is equal to or larger than a predetermined capacity (S507). YES in S507), the priority registered in the attribute information of the selected real-time data buffer 1442 is incremented by one (S508). Then, the priority assigning unit 148 determines whether or not all the real-time data buffers 1442 provided in the storage unit 144 have been selected (S509). If not selected (NO in S509), the process proceeds to S504. Return.

  As described above, if the priorities of all the real-time data buffers 1442 provided in the storage unit 144 are updated by the priority assigning unit 148 (YES in S509), the RTP packet reconstructing unit 146 The real-time data buffer 1442 having attribute information including the highest priority is determined as a transmission target buffer (S510).

  When only one real-time data buffer 1442 is provided in the storage unit 144 (NO in S503), the RTP packet restructuring unit 146 determines the real-time data buffer 1442 as a transmission target buffer (S511).

  When the transmission target buffer is determined as described above, the RTP packet reconstruction unit 146 extracts the integrated real-time data 7 from the transmission target buffer. The RTP packet stores the integrated real-time data 7, and the transmission source and the destination are the transmission destination information specified in the attribute information of the transmission target buffer and the transmission destination and destination specified by the destination information. The packet 8 is reconstructed and passed to the IP packet reconstructing unit 147. Further, the RTP packet reconstruction unit 146 deletes the transmission target buffer from the storage unit 144 (S512).

  When receiving the RTP packet 8 from the RTP packet reconstructing unit 146, the IP packet reconstructing unit 147 reconstructs the UDP packet storing the RTP packet 8, and further reconstructs the IP packet storing the UDP packet. Then, the reconstructed IP packet is transferred to the wireless LAN interface unit 12 (S513). The wireless LAN interface unit 12 stores the IP packet received from the IP packet reconstructing unit 147 in the wireless LAN frame and transmits it to the wireless LAN 5 (S516).

  The embodiment of the present invention has been described above.

  In the present embodiment, real-time data stored in the RTP packet 6 received from the LAN 4 is accumulated and integrated in the order of the sequence numbers of the RTP packets. Then, the integrated real-time data 7 generated thereby is reconstructed into one RTP packet 8 and transmitted to the wireless LAN 5. Therefore, according to the present embodiment, since a plurality of RTP packets 6 are reconstructed into one RTP packet 8, the overhead due to the packet header is reduced, and the communication band can be effectively utilized.

  In the present embodiment, it is determined whether or not it is the transmission timing based on the congestion state of the wireless LAN 5. When it is determined that the transmission timing is reached, the integrated real-time data 7 is reconstructed into one RTP packet 8 and transmitted to the wireless LAN 5. Therefore, according to the present embodiment, it is possible to change the transmission interval and the packet size of RTP packets according to the congestion state of the wireless LAN 5, thereby reducing the frequency of packet loss on the wireless LAN 5. And the influence of packet loss can be reduced.

  In the present embodiment, each real-time data buffer 1442 is given a priority determined according to the buffer duration timer and the data size. Then, the RTP packet 8 is reconstructed and transmitted to the wireless LAN 5 in order from the integrated real-time data 7 stored in the real-time data buffer 1442 having a high priority. For this reason, according to the present embodiment, since the integrated real-time data 7 that remains in the storage unit 144 for a long time can be preferentially transmitted, the delay of the real-time data can be reduced. The influence on reproduction can be further reduced. In addition, since real-time data having a large data size can be preferentially transmitted, the occurrence of fragmentation of real-time data can be reduced during packet reconstruction.

  In the present embodiment, an IP packet buffer 1441 for accumulating IP packets other than UDP packets storing RTP packets is provided, and transmission of the real-time data 7 accumulated in the real-time data buffer 1442 to the wireless LAN 5 The IP packet stored in the buffer 1441 is prioritized. For this reason, according to the present embodiment, it is possible to reduce the influence of IP packets other than UDP packets storing RTP packets on the reproduction of real-time data.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the present embodiment, the priority given to each of the real-time data buffers 1442 is determined based on the buffer duration timer and the data size. However, the present invention is not limited to this. What is necessary is just to determine the priority given to each of the real-time data buffers 1442 based on at least one of the buffer duration timer, the data size, and the buffer start time.

  For example, in S412 of the flow shown in FIG. 4, the real time data storage / integration unit 143 sets the buffer duration timer in the attribute information of the new real time data buffer 1442, and the elapsed time since the real time data buffer 1442 was provided. Instead of starting the measurement, the current time (buffer start time) may be registered as the priority in the attribute information of the new real-time data buffer 1442. In the flow shown in FIG. 5, the processes of S504 to S509 are omitted, and in S510, the RTP packet reconstructing unit 146 transmits the real-time data buffer 1442 having attribute information including the priority indicating the oldest time to be transmitted. The buffer may be determined.

  In the present embodiment, the real-time data stored in the RTP packet 6 is integrated in the order of the sequence number of the RTP packet. However, it may be integrated in the order of the time stamp of the RTP packet 6. In this case, it is not necessary to include a sequence number in the attribute information of the real-time data buffer 1442 in S409 and S411 of the flow shown in FIG. 4, and S407 and S409 are also unnecessary. Further, instead of acquiring the sequence number in S405, the time stamp is acquired from the header of the RTP packet 6. In step S408, the real-time data storage / integration unit 143 adds the acquired time stamp as attribute information to the real-time data extracted from the payload of the RTP packet 6. Then, the real-time data is accumulated in the real-time data buffer 1442 to be updated, and then the real-time data accumulated in the real-time data buffer 1442 to be updated is sorted in order of time stamp. As a result, the extracted real-time data is accumulated and integrated in the real-time data buffer 1442 to be updated.

  Further, in the present embodiment, the configuration of the wireless access point 1 may be implemented by an integrated logic IC such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA), or may be a DSP. (Digital Signal Processor), PC (Personal Computer), etc. may be executed by software.

FIG. 1 is a conceptual diagram for explaining the operating principle of the wireless access point 1 according to the embodiment of the present invention. FIG. 2 is a schematic diagram of the wireless access point 1 according to the embodiment of the present invention. FIG. 3 is a schematic diagram of the downlink relay unit 14. FIG. 4 is a flowchart for explaining the LAN frame reception processing of the wireless access point 1. FIG. 5 is a flowchart for explaining the wireless LAN frame transmission processing of the wireless access point 1.

Explanation of symbols

  1: wireless access point, 2: IP phone, 3: wireless IP phone, 4: LAN, 5: wireless LAN, 11: LAN interface unit, 12: wireless LAN interface unit, 13: uplink relay unit, 14: downlink relay unit 141: IP packet distribution unit 142: IP packet storage unit 143: Real-time data storage / integration unit 144: Storage unit 145: IP packet relay unit 146: RTP packet reconstruction unit 147: IP packet reconfiguration Construction unit, 148: Priority giving unit, 149: Transmission timing judgment unit, 1441: IP packet buffer, 1442: Real-time data buffer

Claims (7)

A wireless access point that relays between wired and wireless networks,
Wired network connection means for connecting to the wired network;
Wireless network connection means for connecting to the wireless network;
Real-time data stored in the real-time communication packet received from the wired network via the wired network connection means is accumulated for each set of transmission source and destination of the real-time communication packet, and the sequence number of the real-time communication packet Real-time data storage / integration means to integrate in order or time stamp order,
Real-time data that is stored and integrated for each set of transmission source and destination by the real-time data storage / integration means is converted into a real-time communication packet for each set and transmitted from the wireless network connection means to the wireless network A wireless access point comprising communication packet reconstructing means. The wireless access point according to claim 1,
Further, the real-time data storage / integration means further includes priority assignment means for assigning priorities to each of the real-time data accumulated and integrated for each set of transmission source and destination,
The real-time communication packet reconstruction means includes:
Radio access characterized in that, in order from the integrated real-time data with the higher priority given by the priority giving means, packets are made into real-time communication packets and transmitted from the wireless network connection means to the wireless network. point. The wireless access point according to claim 2,
The priority assigning means includes
Based on at least one of data capacity, holding time, and accumulation start time, each real-time data accumulated and integrated for each set of transmission source and destination by the real-time data accumulation / integration means is prioritized. A wireless access point that is granted. The wireless access point according to any one of claims 1 to 3,
Wireless transmission timing determination means for determining a wireless transmission timing of a communication packet based on a congestion state of the wireless network;
The real-time communication packet reconstruction means includes:
When the wireless transmission timing determining means determines that the wireless transmission timing is reached, the integrated real-time data is converted into a real-time communication packet and transmitted from the wireless network connection means to the wireless network. Wireless access point. The wireless access point according to claim 4, wherein
Communication packet storage means for sequentially storing communication packets other than real-time communication packets received from the wired network via the wired network connection means;
When it is determined that the wireless transmission timing is determined by the wireless transmission timing determination means, and there is no real-time data stored and integrated for each set of transmission source and destination by the real-time data storage / integration means The wireless access point further comprises communication packet relay means for transmitting the communication packets stored by the communication packet storage means from the wireless network connection means to the wireless network. The wireless access point according to claim 5, wherein
Analyzing a communication packet received from the wired network via the wired network connection means, and if the communication packet is a real-time communication packet, outputting the communication packet to the real-time data storage / integration means, A wireless access point further comprising communication packet distribution means for outputting the communication packet to the communication packet storage means when the packet is not a real-time communication packet. A wireless relay method for real-time communication packets,
Real-time data stored in the real-time communication packet received from the wired network is accumulated for each set of transmission source and destination of the real-time communication packet, and integrated in order of sequence number or time stamp of the real-time communication packet.
Real-time communication packet radio relay method, wherein real-time data accumulated and integrated for each destination is reconstructed into real-time communication packets for each destination and transmitted to a wireless network.

Images