JP4571968B2 - Mobile communication system, transfer method and base station in the same system - Google Patents

Description

  The present invention relates to a soft handover in high-speed and large-capacity communication in a W-CDMA (Wideband-Code Division Multiple Access: Wideband CDMA) system. The present invention relates to a mobile communication system, a transfer method in the same system, and a base station suitable for use in a mobile phone.

  In recent years, development of CDMA mobile communication systems has been progressing rapidly. In addition, commercial services for the W-CDMA system have been started, and it is possible to transmit and receive not only audio and still images, which are the current main services, but also large-capacity data such as moving images. In this situation, 3GPP / 3GPP2 (3rd Generation Partnership Project / 3rd Generation Partnership Project 2) is organized as an organization for standardization of the 3rd generation mobile communication system, and 3GPP / 3GPP2 can realize higher quality services. The system is oriented and various specifications are maintained based on the W-CDMA system.

  FIG. 38 is a schematic configuration diagram of a W-CDMA system. The W-CDMA system shown in FIG. 38 includes a core network (Core Network: CN) 100 including an exchange 101, a radio network controller (RNC: Radio Network Controller) 102-0 and 102-1, and a base station (BTS). : Base Transmitting Station (103-0 to 103-5) and a mobile equipment (UE: User Equipment) 104. Here, a node is used to mean a device that performs packet exchange, transmission, and transfer functions unless otherwise specified. Also, each of the nodes 101, 102-0, 102-1, 103-0 to 103-5, 104 shown in FIG. 38 is physically connected via an ATM (Asynchronous. Transfer Mode) transmission path. ing.

  The handover defined by 3GPP maintains uninterrupted and quality when the mobile station 104 moves away from the base station 103-1 with which it was communicating before the handover and moves to the communication area of another base station 103-2. The wireless resource (wireless channel, wireless carrier) such as a transport channel is switched as it is, and this switching is realized by soft handover.

  FIG. 39A is a diagram illustrating a state before handover, and the mobile device 104 illustrated in FIG. 39A includes base stations 103-1 and 103-2 among the base stations 103-0 to 103-5. And one branch each (physical radio link or radio link) are always set, and radio frames are transmitted and received. Then, the mobile device 104 transmits the same data to the base stations 103-1 and 103-2 at the same time. Base stations 103-1 and 103-2 transmit received data to RNC 102-0 via the ATM transmission path. The RNC 102-0 processes the plurality of data, and transmits the plurality of data to the exchange 101 side or other base stations 103-0 to 103-5 via the ATM transmission path.

  Further, regarding the handover, the mobile device 104 monitors the quality of received data and the like to constantly monitor the radio condition (radio wave condition), and selects and demodulates data with good quality. As a result, when the mobile device 104 receives a radio frame (radio signal) with a large electric field strength as it moves, it establishes a new branch with the base stations 103-0 to 103-5 that transmit the radio frame. Add

FIG. 39B is a diagram illustrating a state after the handover. When the quality of the set branch of the base station 103-2 deteriorates as the mobile device 104 moves, the mobile device 104 changes the branch. Open and delete and communicate with base station 103-1.
By the soft handover procedure by the mobile device 104, the radio link is switched without interruption.

  However, the number of channels required when the mobile device 104 performs soft handover is at least two channels of the handover source node and the handover destination node. For this reason, the bandwidth required for transmission / reception of a radio frame is twice the normal bandwidth. Further, as the transmission speed (communication rate) of communication data increases, the necessary bandwidth per channel increases. Therefore, when the mobile device 104 transmits the same signal using a plurality of channels in the handover state, 1 The bandwidth used per user is very large. When this bandwidth is increased, interference in the radio section is increased to cause a decrease in communication quality and a decrease in the number of users that can be accommodated.

In order to solve the increase in bandwidth and the decrease in the number of users using conventional technology, it is necessary to improve the processing capacity required for each node and each transmission path, increase the number of facilities, and increase the cost. There are significant disadvantages in terms of performance. Furthermore, there are problems shown in (S1) to (S5) below.
(S1) In future high-speed data communication, the bandwidth required for signal transmission / reception will become very large and the introduction of pay-per-use will proceed. Therefore, the connection method will continue to be the mainstream method regardless of the presence or absence of data. Become. Therefore, from the viewpoint of efficiency, the W-CDMA system prepares only one shared channel (shared line) having a sufficiently wide band as compared with a method of allocating a wideband radio resource to each mobile device 104, thereby A method of sharing and using a channel when each mobile device 104 is necessary is desirable. On the other hand, it is difficult to transmit the same data simultaneously to a plurality of channels at all times like soft handover.

  (S2) In this case, the mobile device 104 needs to switch from the shared channel of the handover source node to the shared channel of the handover destination node, but data communication is momentarily interrupted while the mobile device 104 is switched. Also, considering the IP (Internet Protocol) of the transmission path and the speeding up of data communication, the data is converted into one packet and transmitted to the lower nodes than the method of transmitting a large amount of data by dividing it into many fine packets. A method in which the lower node divides the data in accordance with the communication rate in the wireless section and transmits the divided data to the mobile device 104 is desirable, and the use efficiency of the transmission path is high.

Therefore, in consideration of this efficiency and the above-mentioned instantaneous interruption, there is a possibility that all data received and held by the handover source node in a handover state may remain without being transmitted.
(S3) In order to prevent data loss, in the conventional method, the upper layer of the handover source node discards the residual data of the handover source node itself and retransmits it based on the upper communication protocol. However, this increase in retransmission causes a decrease in communication rate.

(S4) Similarly, since an increase in retransmission causes an increase in unnecessary traffic, the processing capacity of each node and each transmission path (for example, the capacity of protocol processing, signal transmission / reception, or accounting processing) is reduced. That is, the cost performance of the equipment is deteriorated.
(S5) Further, since the real-time property of communication is lowered, the quality of service is deteriorated.
The present invention was devised in view of such problems, and maintains a wide bandwidth while maintaining the number of users that can be accommodated, efficiently sharing a line during soft handover, and using a variable communication rate. It is an object of the present invention to provide a mobile communication system, a transfer method in the same system, and a base station that can avoid data residue and prevent an increase in retransmission.

  For this reason, the mobile communication system of the present invention is a mobile communication system for transferring residual packet data in a first base station to a second base station in accordance with a handover process executed in accordance with movement of the mobile station. A control unit that executes the transfer without performing an encapsulation process that adds a retransmission control header to the residual packet data, and the mobile station includes a reception unit that receives the transferred residual packet data. Item 1).

  Further, the transfer method in the mobile communication system of the present invention is a mobile communication system that transfers residual packet data in the first base station to the second base station in accordance with a handover process executed in accordance with the movement of the mobile station. In the transfer method, the transfer is executed without performing encapsulation processing for adding a retransmission control header to the residual packet data, and the mobile station receives the transferred residual packet data.

  Furthermore, the base station of the present invention provides a base station before handover in a mobile communication system that transfers residual packet data in a handover source base station to a handover destination base station in response to a handover process executed in accordance with movement of the mobile station. A base station that can be a station includes a control unit that performs the transfer without performing an encapsulation process for adding a retransmission control header to the residual packet data.

Here, the header may include a sequence number (claims 2, 4, 6).
The mobile communication system according to the technique related to the present invention transfers the residual packet data in the first base station to the second base station in accordance with a handover process executed in accordance with the movement of the mobile station. The transfer includes a transfer control unit that executes after the second base station completes securing resources for communication with the mobile station, and the mobile station transmits the transferred residual packet data Ru a receiving unit that receives.

The transfer method in the mobile communication system of the technology related to the present invention transfers the residual packet data in the first base station to the second base station in accordance with a handover process executed in accordance with the movement of the mobile station. In the transfer method in the mobile communication system, the transfer is executed after the second base station completes securing of resources for communication with the mobile station, and the mobile station transfers the transferred residual packet data that will receive.

Furthermore, the base station of the technology related to the present invention is a mobile communication system that transfers residual packet data in a handover source base station to a handover destination base station in accordance with a handover process executed in accordance with movement of the mobile station. in the base station that may be before the handover base station, said transfer Ru includes a transfer control unit for the base station of the handover destination is executed from the reservation of resources for communicating with the mobile station is completed.

The mobile communication system according to the technique related to the present invention transfers the residual packet data in the first base station to the second base station in accordance with a handover process executed in accordance with the movement of the mobile station. The first base station makes a resource request for transfer to the second base station before executing the transfer, and the transfer resource executes the transfer after the resource is secured. comprising a securing means, the mobile station, Ru includes a receiving unit that receives the transferred the residual packet data.

The transfer method in the mobile communication system of the technology related to the present invention transfers the residual packet data in the first base station to the second base station in accordance with a handover process executed in accordance with the movement of the mobile station. In the transfer method in the mobile communication system, before executing the transfer, the first base station makes a resource request for transfer to the second base station, and the transfer is performed after the resource is secured. It is executed, and the mobile station that will receive the transferred the residual packet data.

Furthermore, the base station of the technology related to the present invention is a mobile communication system that transfers residual packet data in a handover source base station to a handover destination base station in accordance with a handover process executed in accordance with movement of the mobile station. In the base station that can be the base station before the handover, before executing the transfer, a resource request for the transfer is made to the handover destination base station, and the transfer is executed after the resource is secured. Ru with a resource securing means.

The mobile communication system according to the technique related to the present invention transfers the residual packet data in the first base station to the second base station in accordance with a handover process executed in accordance with the movement of the mobile station. A retransmission control means for performing retransmission control of a radio section performed with the mobile station on the residual packet data transferred to the second base station under the management of the second base station; A notification means for notifying the retransmission control unit of the first base station of whether the residual packet data can be delivered to the mobile station, and the mobile station receives the transferred residual packet data Ru equipped with a receiver.

The transfer method in the mobile communication system of the technology related to the present invention transfers the residual packet data in the first base station to the second base station in accordance with a handover process executed in accordance with the movement of the mobile station. In a transfer method in a mobile communication system, retransmission control of a radio section performed between the mobile station and the residual packet data transferred to the second base station is performed under the management of the second base station. run notifies whether delivery to the mobile station for the residual packet data to retransmission control section of the first base station, the mobile station that will receive the transferred the residual packet data.

Furthermore, the base station of the technology related to the present invention is a mobile communication system that transfers residual packet data in a handover source base station to a handover destination base station in accordance with a handover process executed in accordance with movement of the mobile station. In a base station that can be a handover destination base station, retransmission control means for performing retransmission control of a radio section executed with the mobile station for the transferred residual packet data, and the mobile station for the residual packet data whether delivery to Ru and a notifying means for notifying the retransmission control unit of the handover source base station.

  The packet transfer / transmission method of the technology related to the present invention includes an upper node that transmits a plurality of packets addressed to a mobile device, a handover source node that transmits a plurality of packets addressed to the mobile device, and a plurality of addresses addressed to the mobile device. A packet transfer / transmission method in a mobile communication system comprising a handover destination node that transmits a packet of A transfer / transmission step in which a residual packet of transmission is transferred to the handover destination node, and an upper node transmits the packet to the handover destination node.

Therefore, in this way, the handover destination node does not need to transmit the same signal using a plurality of channels with the mobile device at the time of handover, so that the number of users can be increased and communication quality can be improved. Effective use of resources becomes possible.
In this transfer / transmission step, the following two patterns A and B can be used.

(A) A method in which the handover source node or the upper node stops transmission of packets from the upper node at the time of transferring the residual packet. According to this method, the use efficiency of radio resources can be improved. For example, a new packet and transfer data can be transmitted in parallel.
(B) a channel setting step in which the upper node performs either one of assignment of a separate transfer channel or securing of an additional channel between the handover destination node and the handover source node based on the packet amount in the radio section; A scheduling step in which a node schedules packet transmission using a separate transfer channel or additional channel secured in the channel setting step and a new channel, and a handover destination node based on scheduling in the scheduling step for packets and residual packets And a scheduling transmission step of transmitting to the mobile station. According to this method, loss of packet transmission / reception can be prevented by retransmission control, and integrity is guaranteed.

  In each of the transfer / transmission steps, the handover source node encapsulates the residual packet according to the instruction from the upper node or the identification of the received frame, and the handover destination node encapsulates the residual packet in the second capsule. Thus, the residual packet may be transmitted to the mobile station. In this way, data communication between the handover source node and the handover destination node and data communication between the handover source node and the mobile station are performed. The completeness of each is guaranteed.

  Further, in each of the transfer / transmission steps described above, the handover destination node transmits / receives a frame to / from the mobile device based on a correspondence table between a header given by the handover source node and a header given by the handover destination node. May be. Here, the handover destination node can also insert identification information for identifying the encapsulated packet and the normal packet in the frame transmitted to the mobile station, and in this way, the completeness of data communication can be achieved. Is guaranteed, and high-speed processing is possible.

  Furthermore, the mobile communication system of the technology related to the present invention includes a first line receiving unit in which a handover source node receives a packet from an upper node, a buffer that holds a packet received by the first line receiving unit, A first retransmission control unit that performs retransmission control on the amount of packets to be transferred based on the resource capacity of the handover destination node included in the packet received by the first line reception unit and the residual amount of the packet held in the buffer; Based on the amount of packets subjected to retransmission control by the first retransmission control unit, the packet held in the buffer is transmitted to the handover destination node without going through the upper node or to the handover destination node through the upper node. And a first line transmission unit.

Therefore, in this way, loss of user data can be prevented, and the quality of various services such as stable communication rate and improved real-time performance can be improved.
The mobile communication system of the technology related to the present invention includes an upper node that transmits a plurality of packets addressed to a mobile device, a handover source node that transmits a plurality of packets addressed to the mobile device, a mobile device after the handover, and the packet In a mobile communication system having a handover destination node that transmits and receives a packet, the handover destination node receives a plurality of packets from the upper node and the handover source node, and a second line reception unit receives the second line reception unit. A second retransmission control unit that performs retransmission control on the packet, and a retransmission control header that is subjected to retransmission control by the second retransmission control unit is added to the plurality of packets received by the second line reception unit, and the radio frame with the header is transmitted to the mobile And a second transmission unit that transmits the data.

Therefore, in this way, the frame format for radio transmission can be changed using an instruction from the upper node, and the buffer capacity of the handover destination node can be made constant.
Furthermore, a mobile communication system according to a technique related to the present invention is a mobile communication system having a function of switching a data transmission path from a host device to a mobile device from transmission from a handover source node to transmission from a handover destination node. The handover source node has transfer means for transferring data to the mobile device remaining in the handover source node to the handover destination node at the time of switching, and the handover destination node receives the data received from the transfer and the higher-level device. And transmitting means for transmitting the data to the mobile device.

Therefore, in this way, the real-time property of communication is improved and the quality of service is improved. The number of retransmissions can be reduced.
This mobile communication system can also stop transmission of data from the higher-level device to the handover destination node during transfer by the transfer means, which can contribute to optimization of radio resources, The cost performance in the system is improved.

(A) Description of First Embodiment of the Invention Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a main part of a W-CDMA system to which the present invention is applied. A W-CDMA system 50 shown in FIG. 1 is a mobile communication system that implements the packet transfer / transmission method of the present invention and transmits / receives large-capacity data such as voice, still images, and moving images between a network and a mobile device. A core network (CN) 100, radio network controllers (RNC) 2-0 and 2-1, base stations (BTS) 3-0 to 3-5, and a mobile device (UE) 4 are provided. Configured. Although this W-CDMA system 50 has a large number of nodes, they are not shown.

(1-1) Core network 100 and exchange 1
The core network 100 is a network in which a circuit switch, a packet switch, and a number of higher order nodes (not shown) are connected to each other, and transmits a high-speed and large-capacity packet, and includes the switch 1 having a packet switching function.
Note that, when the transmission / reception data is HS-DSCH data or DSCH data, the higher order node corresponds to RNC 2-0, 2-1, or switch 1, respectively, and the lower order nodes are base stations 3-0 to 3-5. Or it corresponds to RNC2-0, 2-1.

FIG. 2 is a schematic block diagram of the exchange 1 according to the first embodiment of the present invention. The exchange 1 shown in FIG. 2 transmits a plurality of new packets from a network other than the core network 100 to the mobile device 4, and includes a line termination unit 1b, a control unit 1a, and an exchange unit 1c. It is configured.
Here, the line terminating unit 1b is connected to another upper node (for example, the exchange 1 itself or an upper node other than the RNC 2-0, 2-1) or a lower node (for example, the base stations 3-0 to 3-5 or the RNC 2-0, 2-1) terminates data by transmitting / receiving data or packets, and controls data flow by flow control from lower nodes.

The exchange unit 1c exchanges a line with an upper node or a lower node.
Further, the control unit 1a controls the exchange unit 1c based on a control signal from the upper node or the lower node.
As a result, the exchange 1 transfers the header-attached packet received from the network other than the core network 100 and the mobile station 4 to the RNC 2-0, 2-1 or the core network 100 based on the destination.

(1-2) RNC2-0, 2-1
RNCs 2-0 and 2-1 each have a function for terminating a wireless protocol defined by 3GPP, packet transfer, control of base stations 3-0 to 3-5, channel assignment, handover, and outgoing / incoming connection. And each function. Further, each RNC 2-0, 2-1 controls transmission of DSCH data and HS-DSCH data according to transmission stop (transmission stop message) and start request (start request message) from the base stations 3-0 to 3-5. It also has a function to

In the following description, unless otherwise specified, handover refers to a case where the mobile device 4 transmits, for example, a base station 3-1 communicating before the handover to a base station 3-2 communicating after the handover. This means that the port channel (Transport Channel: TrCH) is switched.
(1-3) Base stations 3-0 to 3-5
(1-3-1) About Handover Source Node and Handover Destination Node Each of the base stations 3-0 to 3-5 can terminate a radio protocol defined by 3GPP or the like, and the cell 110-0 It functions as a logical node (Node B) for the radio link of the mobile device 4 in ˜110-5. Each of the base stations 3-0 to 3-5 has a function of transferring buffered DSCH data or HS-DSCH data from the handover source node to the handover destination node under the control of the exchange 1.

  For convenience of the following description, unless otherwise specified, the base stations 3-1 and 3-2 function as a handover source node and a handover destination node of the mobile device 4, respectively. Here, the handover source node transmits and receives packets to and from the mobile device 4 before handover, and the handover destination node transmits a plurality of new packets from the exchange 1 to the mobile device 4 to the mobile device 4 before handover. To be sent. Each of the base stations 3-3 to 3-5 can function as a handover source node or a handover destination node.

  When the base station 3-1 as the handover source node is buffering data to be transmitted from the exchange 1 to the mobile station 4, the data to be transmitted is suspended in order to pause transmission of a new packet from the exchange 1. A transmission stop request is transmitted to the exchange 1 until becomes empty. When the data to be transmitted by the base station 3-1 becomes empty, a transmission start request for notifying that the buffer is empty is transmitted to the exchange 1.

  Further, when the data to be transmitted from the exchange 1 to the mobile station 4 is buffered, the base station 3-1 transfers the buffered data to the base station 3-2 as a handover destination node. On the other hand, the base station 3-2 has an arbitration function of receiving the transferred data and data newly transmitted from the exchange 1 and transmitting the received data to the mobile unit 4 while arbitrating the received data. .

(1-3-2) Configuration of Base Stations 3-0 to 3-5 Each of the base stations 3-0 to 3-5 has a radio transmission function (modulation) for packets transmitted from the RNCs 2-0 and 2-1. , Code spread, radio frame transmission, etc.), radio reception functions (radio frame reception, despreading, demodulation, etc.), and a function for constantly monitoring usage of a plurality of radio resources.

FIG. 3 is a block diagram of the base station 3-1 according to the first embodiment of the present invention. 3 includes a receiving unit (first receiving unit) 2a, a line terminating unit (first line terminating unit) 2b, a call control unit (first call controlling unit) 2c, an ARQ control unit ( A first retransmission control unit) 2d, an ARQ termination unit (first ARQ termination unit) 2e, and a transmission unit (first transmission unit) 2f are provided.
Here, the receiving unit 2a receives a radio frame from the mobile device 4 and performs demodulation and decoding processing. The transmission unit 2 f encodes transmission data, modulates it, and transmits it to the mobile device 4. Moreover, the transmission part 2f can give the priority demonstrated by the pattern B mentioned later to transmission data.

The line termination unit 2b terminates data between the exchange 1 side or the base station 3-2 and exchanges data transferred from the data holding buffer 2g provided in the ARQ termination unit 2e. It transmits or forwards to one side or the base station 3-2, and comprises a first line receiving unit 22a and a first line transmitting unit 22b.
Here, the first line receiving unit 22a receives a packet from the exchange 1 side or the base station 3-2. The buffer 2g holds the packet received by the first line receiving unit 22a.

  The first line transmission unit 22b does not pass the packet held in the buffer 2g via the exchange 1 or the RNCs 2-0 and 2-1, based on the packet amount subjected to retransmission control by the ARQ control unit 2d described below. The data is transmitted to the base station 3-2 of the handover destination node or to the base station 3-2 via the upper node (base station 3-2 or exchange 1). Thereby, transmission / reception of data to / from the exchange 1 side or the mobile station 4 side is terminated.

Further, the call control unit 2 c performs handover control based on the call control signal received from the mobile device 4.
Then, the ARQ control unit 2d determines that the resource capacity of the base station 3-2 included in the packet received by the first line receiving unit 22a (line terminating unit 2b) and the remaining amount of the packet held in the buffer 2g. Based on this, retransmission control is performed on the amount of packets to be transferred. The ARQ control unit 2d performs start, change, and end operations of the H-ARQ (Hybrid-Auto Repeat Request) protocol under the control of the call control unit 2c. This H-ARQ is the name of the ARQ protocol defined in HS-DSCH.

  As is well known, ARQ is a method for retransmitting data lost due to an error in a radio section or the like by retransmission control, thereby ensuring data integrity, and H- ARQ represents ARQ that operates at high speed. In response to an instruction that the ARQ control unit 2d outputs to the ARQ termination unit 2e, the data waiting for transmission held in the buffer 2g can be transferred to the line termination unit 2b. As a result, data flow can be controlled using flow control.

The ARQ termination unit 2e terminates the ARQ protocol, and includes new data received from the exchange 1 or the RNCs 2-0 and 2-1, transfer data from the handover source node (base station 3-2), and , And mediate and encapsulate the received data.
Further, the line termination unit 2b, the call control unit 2c, the ARQ control unit 2d, and the ARQ termination unit 2e cooperate to function as transfer means (2b, 2c, 2d, 2e).

In this manner, information data and error correction data can be transmitted independently by H-ARQ, and the number of retransmissions can be reduced. The ARQ control unit 2d can also use normal ARQ.
FIG. 4 is a block diagram of the base station 3-2 according to the first embodiment of the present invention. The base station 3-2 shown in FIG. 4 includes the receiving units 2a, 2a provided in the base station 3-1. Line termination unit 2b, call control unit 2c, ARQ control unit 2d, ARQ termination unit 2e, reception unit (second reception unit) 3a having the same function as each of transmission unit 2f, line termination unit (second line termination unit) ) 3b, a call control unit (second call control unit) 3c, an ARQ control unit (second retransmission control unit) 3d, an ARQ termination unit (second ARQ termination unit) 3e, and a transmission unit (second transmission unit) 3f It is configured.

  Here, the line terminating unit 3b terminates data in the interval between the upper exchange 1 and the lower base station 3-1, and includes a second line receiving unit 33a and a second line transmitting unit 33b. Configured. The second line receiving unit 33b receives a plurality of packets from the upper exchange 1 and the lower base station 3-1. The second line transmission unit 33b performs retransmission control on a plurality of packets received by the second line reception unit 33b by the ARQ control unit 3d described below. The ARQ control unit 3d performs retransmission control on the plurality of packets received by the second line reception unit 33b.

Further, the transmission unit 3f adds a retransmission control header controlled by the ARQ control unit 3d to the plurality of packets received by the second line reception unit 33a, and transmits the radio frame with the header to the mobile device 4. To send. The header addition of the transmission unit 3f will be described in patterns B and C described later.
The call control unit 3c, the ARQ control unit 3d, the ARQ termination unit 3e, and the transmission unit 3f cooperate to function as transmission means (3c, 3d, 3e, 3f).

Description of functions related to those other than these will be omitted because they are redundant. In addition, since the configurations of the base stations 3-0 and 3-3 to 3-5 are the same as the configuration of the base station 3-1, duplicate description will be omitted.
As described above, the W-CDMA system 50 has a function of switching the data transmission path from the upper node (upper apparatus) to the mobile device 4 from transmission from the handover source node 2 to transmission from the handover destination node 3. Then, the handover source node 2 includes transfer means (2b, 2c, 2d, 2e) for transferring the data to the mobile device 4 remaining in the handover source node 2 to the handover destination node 3 at the time of switching. The destination node 3 includes transmission means (3c, 3d, 3e, 3f) for transmitting the data received by the transfer and the data from the upper node to the mobile device 4.

(1-4) Mobile station (UE) 4
The mobile device 4 has a function of communicating with the base stations 3-0 to 3-5 using radio, a function of transmitting and receiving data related to communication, management and control, and a function of performing an H-ARQ operation. Is a mobile phone or a mobile wireless terminal operated.
FIG. 5 is a block diagram of the mobile device 4 according to the first embodiment of the present invention. The mobile device 4 shown in FIG. 5 includes an antenna 4f, a reception unit 4a, an ARQ termination unit 4b, a call control unit 4c, an ARQ control unit 4d, and a transmission unit 4e.

  The antenna 4f transmits and receives a radio frame. The receiving unit 4a receives radio frames from the base stations 3-0 to 3-5, and performs demodulation and decoding processing. The ARQ termination unit 4b terminates the ARQ protocol. The call control unit 4c performs a handover process based on call control signals received from the base stations 3-0 to 3-5. The ARQ control unit 4d performs ARQ protocol start, modulation, and end operations under the control of the call control unit 4c. The transmission unit 4e encodes and modulates the call control signal, user data, and ARQ ACK / NACK, and transmits the result to the base stations 3-0 to 3-5.

(1-5) Cells 110-0 to 110-5 (see FIG. 1)
Cells 110-0 to 110-5 represent approximate ranges in which high-quality radio frames can be transmitted and received between the mobile device 4 and the base stations 3-0 to 3-5, respectively. The range of 0 to 110-5 generally overlaps the range of adjacent cells 110-0 to 110-5. When the mobile device 4 moves to this overlapping range, the same data is transmitted / received to / from the adjacent base stations 3-0 to 3-5, thereby performing soft handover.

(1-6) Transmission path Each of the nodes 101, 102-0 to 102-n, 103-0 to 103-n, 104 is physically connected via an ATM transmission path. The interface is specified in the specification. Specifically, an interface between the RNCs 102-0 to 102-n and the exchange 101 is an ATM transmission line and is referred to as Iu, and an interface between the RNCs 102-0 to 102-n is referred to as Iur. The interface between the RNCs 102-0 to 102-n and the base stations 103-0 to 103-n is an ATM transmission line, and is between Iub and the base stations 103-0 to 103-n and the mobile station 105. These interfaces are referred to as Uu, respectively.

(1-7) New Packets and Transfer Packets Both the exchange 1 and the mobile device 4 make large volumes of audio data, text data, image data, etc. into a large number of fine data, and packetize the fragmented data. Send multiple packets without packetization or using packetization.
Accordingly, for the downlink, the exchange 1 fragments and transmits voice data, text data, etc. to the same mobile station 4 at regular intervals without interruption, and transmits different types to different mobile stations (not shown). Send as text data. The same applies to the uplink.

Specifically, in a user telephone (not shown) of the core network 100, voice or the like is encoded every predetermined time, and the encoded voice data is fragmented into, for example, 1000 data, and the 1000 data Each is assigned a header having a serial number counted up from 1, in order to create 1200 packets.
Thereby, for example, the ARQ control units 2d and 3d provided in the RNCs 2-0 and 2-1, respectively, for the packets with serial numbers, the serial numbers of the packets that could be normally received and the serial numbers of the packets that could not be normally received. And record. Then, the ARQ control units 2d and 3d both request retransmission of unreceived packets to the user telephones of the core network 100, and when receiving two retransmitted packets, all the packets are received. recognize. Next, the ARQ unit extracts data included in 1200 packets, assembles a voice or text file within a predetermined time as a unit of user information, and then passes the data to a higher layer. Note that this assembly may be performed by an upper layer of layer 3 or higher instead of the layer 2 ARQ unit.

  In the following description, voice data, text data, etc. are referred to as a new packet as a transmission / reception unit. That is, each new packet represents one unit of user information consisting of a large number of packets. Each packet is once buffered by RNCs 2-0 and 2-1, and then transmitted to mobile unit 4. Using the serial number assigned to each packet, reception / non-reception of each packet is managed by an ARQ (Auto Repeat Request) unit provided in each node that transmits / receives or relays the packet. Here, it is preferable to use H-ARQ having a processing speed that is faster than that when using this ARQ.

The configuration shown in FIG. 1 is the same in a second embodiment described later.
(2) The packet transfer / transmission method of the present invention will be described below with reference to FIG.
FIG. 6 is a diagram for explaining the packet transfer / transmission method according to the first embodiment of the present invention, and shows a model in which the configuration shown in FIG. 1 is simplified. The upper node shown in FIG. 6 corresponds to the exchange 1 in the HS-DSCH channel. The upper node 1 transmits user data and performs handover control. The handover source node 2 (base station 3-1) and the handover destination node 3 (base station 3-2) communicate with the upper node 1. Then, uplink packets and downlink packets are transmitted / received, and radio frames are transmitted / received to / from the mobile device 4 using the ARQ communication protocol. By using this ARQ, complete data communication is guaranteed between the handover source node 2 and the handover destination node 3 and the mobile device 4.

  Then, in the handover destination node 3, the data format between the transmission path section and the radio section is converted. Here, the ARQ protocol in the handover source node 2 and the handover destination node 3 corresponds to an RLC (Radio Link Control) protocol. The mobile device 4 transmits and receives radio frames to and from the handover source node 2 and the handover destination node 3, and performs handover.

Hereinafter, unless otherwise specified, the mobile device 4 performs a handover by walking, a vehicle, a train, or the like while performing packet transmission / reception with the handover source node 2 and performs packet transmission / reception with the handover destination node 3.
(2-1) Packet Transfer / Transmission Method of the Present Invention The packet transfer / transmission method of the present invention transmits a plurality of packets addressed to the mobile device 4 and the upper node 1 that transmits the plurality of packets addressed to the mobile device 4. In the W-CDMA system 50 including the handover source node 2 and the handover destination node 3 that transmits a plurality of packets addressed to the mobile device 4, the upper node 1 determines the execution of the handover (decision step). . Then, the handover source node 2 transfers an untransmitted residual packet among the plurality of packets to the handover destination node 3, and the upper node 1 transmits a new packet to the handover destination node 3 (transfer / transmission) Step). Further, it is preferable that the execution of the handover (determination step) is based on a handover request transmitted from the mobile device 4 or based on a radio status report from the mobile device 4.

(2-2) Implementation patterns A to D
The implementation pattern of the packet transfer / transmission method of the present invention has four types of patterns A to D as described below. Further, these patterns A to D are determined by the handover source node 2 as the handover destination node 3. On the other hand, patterns A and C and patterns B and D can be classified as modes for transferring and transmitting packets.

(2-3) Relationship between Implementation Patterns A to D and This Packet Transfer / Transmission Method The first packet transfer / transmission method (patterns A and C) is a new packet transmission from the upper node 1 to the handover destination node 3. How to stop. That is, the handover source node 2 (or the upper node 1 itself) stops transmission of a new packet from the upper node 1 (stop step), and while the transmission of the new packet is stopped, the handover source node 2 The residual packet is transferred to the handover destination node 3 (first residual packet transfer step). When the residual packet is transferred in the first residual packet transfer step, the handover source node 2 (or the upper node 1 itself 1) restarts transmission of a new packet from the upper node 1 (restart step). The node 1 transmits a new packet to the handover destination node 3 (new packet transmission step).

  In the second packet transfer / transmission method (patterns B and D), new packet transmission from the upper node 1 to the handover destination node 3 is continued, and the handover destination node 3 and the packet transferred from the handover source node 2 In this method, a new packet transmitted from the node 1 is arbitrated. That is, the handover source node 2 transfers the residual packet to the handover destination node 3 (second residual packet transfer step), and the upper node 1 transmits a new packet to the handover destination node 3 (new) Packet transmission step). Then, the handover destination node 3 arbitrates between the packet transferred in the second residual packet transfer step and the packet transmitted in the new packet transmission step (arbitration step).

  Furthermore, patterns C and D are methods for encapsulating transfer data for patterns A and B, respectively. Therefore, the patterns A to D can be roughly classified into 2 patterns × 2 patterns. In other words, the patterns A and B are used to stop / not stop the transmission of new packets from the upper node 1 while transferring the data remaining without being transmitted to the handover source node 2 to the handover destination node 3 at the time of handover. Corresponds to the case. Further, patterns C and D correspond to cases where transfer data is considered as a part of new packet communication and encapsulated / not encapsulated when transferring data.

  The patterns A to D have two patterns added according to the transfer method of the residual packet. Specifically, the two added patterns are the case where a direct transfer line is set between the upper node 1 and the handover source node 2 and the handover destination node 3 and This is equivalent to the case of performing, and will be described as the above four extended patterns in the following description.

(2-4) Description of DSCH and HS-DSCH FIG. 40 is a diagram for explaining DSCH. The DSCH shown in FIG. 40 is a downlink channel shared by a plurality of mobile devices 4 (for example, users 1 to 3), and thereby the use efficiency of radio resources is achieved. The HS-DSCH (not shown) means a DSCH capable of high-speed data transmission. The specifications of DSCH and HS-DSCH are defined in description TS25.435 / 427/425 and description TR25.835 / 837/848/855/877/950, respectively.

  Both of these DSCH data and HS-DSCH data are terminated at different devices. In the W-CDMA system 50, the DSCH data is terminated by the RNCs 2-0 and 2-1, and the upper and lower nodes correspond to the exchange and the RNC, respectively. In the system using DSCH, all functions such as RLC (Radio Link Control) protocol processing are concentrated on RNCs 2-0 and 2-1. The main function of the base stations 3-0 to 3-5 is conversion between a transmission path section and a radio section (illustration is omitted for simplification).

  On the other hand, HS-DSCH data is terminated at base stations 3-0 to 3-5, and upper and lower nodes correspond to RNCs 2-0 and 2-1, and base stations 3-0 to 3-5, respectively. . In the HS-DSCH system, base stations 3-0 to 3-5 close to the mobile device 4 are provided with an ARQ function. The ARQ function uses the H-ARQ protocol. The H-ARQ is a method for guaranteeing data integrity by retransmitting data lost due to an error in a radio section or the like by retransmission control.

Hereinafter, the case where HS-DSCH is used will be described, and the upper node and the lower node will be described as being RNCs 2-0 and 2-1, and base stations 3-0 to 3-5, respectively. Note that the present invention can be implemented even when DSCH is used.
(2-5) Schematic Explanation of Patterns A to D Next, a control signal and a sequence of user data between the nodes will be described using a model shown in FIG.

Each pattern will be described in the order shown in the following A to D.
A. B. Stop transmission of new packet during transfer of residual packet and do not encapsulate transfer data. A new packet is transmitted even during transfer of the residual packet, and the transfer data is not encapsulated. D. Stop transmission of new packet during transfer of residual packet and encapsulate transfer data. While transferring a residual packet, a new packet is transmitted and transfer data is encapsulated. Each pattern will be described below.

(3) Description of Pattern A FIGS. 7A to 7E are diagrams for explaining the operation of the pattern A according to the first embodiment of the present invention.
When the mobile device 4 shown in FIG. 7A starts moving, the handover source node 2 detects quality degradation. Then, the handover source node 2 shown in FIG. 7B causes the upper node 1 to stop (suspend) new packet transmission by the upper node 1 for the residual packet transfer. Next, the handover source node 2 transfers the residual packet to the handover destination node 3 (see FIG. 7C) designated by the upper node 1. When the residual packet transfer is completed, the handover source node 2 shown in FIG. 7D transmits a resume request to the upper node 1 in order to resume (resume) new packet transmission. Thereafter, the upper node 1 shown in FIG. 7 (e) transmits a new packet to the handover destination node 3.

  The operation of the same pattern A will be described using the sequence example shown in FIG. The HO, the HO source lower node, the HO destination lower node, and the upper node shown in FIG. 8 represent a handover, a handover source node, a handover destination node, and an upper node, respectively, and are also referred to in the following description. It is the same. (3-1) to (3-9) correspond to reference numerals 1 to 9 in FIG.

(3-1) The upper node 1 shown in FIG. 8 monitors the signal quality received from the mobile device 4, detects the deterioration thereof, and starts the handover. The cause of the start of the handover is not only a handover request by the mobile device 4 but also a determination in the upper node 1 based on a radio status report of the mobile device 4 itself transmitted from the mobile device 4 to the upper node 1.
In this case, the mobile device 4 constantly measures the wireless status around the location of the mobile device 4 itself, reports this wireless status to the upper node 1, and an instruction regarding handover from the upper node 1 is sent to the mobile device 4. It is to be sent to. As an example of the radio status report, the upper node 1 constantly receives information on an actual measurement value, which radio area quality is improved, and which radio area quality is degraded. Then, the upper node 1 compares the information transmitted from the mobile device 4 with the wireless strength information held in advance, and determines whether or not the electric field strength is capable of wireless communication. Then, the upper node 1 selects an appropriate area among the wireless areas around the mobile device 4 and notifies the handover source node 2 of the selected area. Thereby, the handover source node 2 can know the handover destination node 3.

  (3-2) The higher order node 1 transmits a handover preparation request to the handover destination node 3 in order to request resource reservation for communication with the mobile device 4 to be handed over (in other drawings as well). The same). The handover destination node 3 secures resources based on this request. When the channel between the upper node 1 and the handover destination node 3 has not been set yet (in the case of the first message transmission / reception), the handover destination node 3 uses the shared channel (shared TrCH with the upper node 1). : Shared transport channel) is newly activated, the shared transport channel is activated to prepare for handover, and handover completion completion is transmitted to the upper node 1. If there is a channel already activated, a user is added.

(3-3) The upper node 1 permits the handover source node 2 to execute the handover. When the handover source node 2 receives the permission (handover execution permission), the handover source node 2 transmits a suspend (stop) request to the upper node 1 and stops the transmission of the new packet.
Note that instead of the handover source node 2 transmitting a suspend request, the upper node 1 itself may stop transmitting a new packet based on the time when the handover execution is permitted.

(3-4) The upper node 1 transmits a handover instruction (handover execution request) to the mobile device 4. In accordance with the instruction, the mobile device 4 starts performing handover and resets the content held by the ARQ control unit 4d (see FIG. 5). Further, the mobile device 4 moves to the handover destination node 3 and secures a communication channel.
(3-5) The upper node 1 sets up a bearer channel for transferring data remaining in the handover source node 2 to the handover destination node 3. This bearer channel may be directly connected between the handover source node 2 and the handover destination node 3 or may be set via the upper node 1.

  (3-6) The upper node 1 requests the handover source node 2 to transfer the residual packet (displayed as the retained data transfer instruction). In response to this request, the handover source node 2 transfers the residual packet (user data) to the handover destination node 3 using the bearer channel set in (3-5). The handover destination node 3 transfers the residual packet to the mobile device 4 while the ARQ control unit 4 d monitors the residual packet from the handover source node 2.

  (3-7) When the transfer of the residual packet is completed, the handover source node 2 releases the shared channel and releases the resources secured by the handed over mobile station 4, and sends a resume request to the upper node 1. Send. In the sequence shown in FIG. 8, the handover source node 2 outputs a resume request, but the upper node 1 itself may monitor transfer completion and may be restarted upon completion detection.

(3-8, 3-9) Upon receiving the resume request, the upper node 1 releases the bearer channel set for residual packet transfer and restarts transmission of a new packet to the handover destination node 3.
As described above, the W-CDMA system 50 stops the transmission of data from the upper node to the handover destination node 3 during the transfer by the transfer means (2b, 2c, 2d, 2e).

Thus, by temporarily stopping the transmission of new packets during the transfer of residual packets, the number of users that can be accommodated is maintained while ensuring a wide bandwidth, and the line can be efficiently shared during soft handover.
(4) Description of Pattern B FIGS. 9A to 9C are diagrams for explaining the pattern B, respectively. When the mobile device 4 shown in FIG. 9A starts moving, the handover source node 2 detects quality degradation. Next, the handover source node 2 shown in FIG. 9B transfers the residual packet to the handover destination node 3 via the upper node 1. Here, the upper node 1 continues to transmit the new packet, and the handover destination node 3 receives the transfer packet and the new packet. Further, after the transfer of the residual packet is completed, the transmission of the new packet from the upper node 1 to the handover destination node 3 shown in FIG. 9C continues.

  The packet transfer / transmission method (transfer / transmission step) of pattern B is such that the handover source node 2 or the upper node 1 secures a resource for holding the residual packet in the handover destination node 3 and transmits a new packet. Yes. Specifically, the handover source node 2 having the residual packet transmits a resource allocation request to the transfer destination handover destination node 3. At this time, the handover source node 2 requests the handover destination node 3 to secure a resource having a capacity sufficient to transmit all the remaining packets. In addition, in order for the handover source node 2 to transmit the transfer data with a higher priority than the new packet, it is desirable that the transmission unit 2f (see FIG. 3) allocates a priority and requests a resource.

In this way, new packets continue to be transmitted even during transfer of residual packets. Further, the transfer data is transferred without being encapsulated.
(4-1) Description of Transfer Method Hereinafter, transfer between the handover source node and the handover destination node will be described in (4-1-1) to (4-1-3), and (4-1-4) The transfer between the handover destination node and the mobile station will be described in FIG.

The transfer method described below can be used and will be described with reference to FIGS. The transfer methods shown in FIGS. 10 to 16 can be combined.
(4-1-1) FIG. 10 is a diagram for explaining an arbitration method based on a resource allocation request according to the first embodiment of the present invention. The handover source node 2 shown in FIG. 10 requests the handover destination node 3 to report the current availability of resources (resource allocation request). Then, the handover destination node 3 checks the free capacity of the buffer 3g and notifies the free resource allocation (resource allocation permission). The handover source node 2 transfers as much data as can be transferred among the remaining packets held by the handover source node 2 according to the resource availability (user data transfer). The handover source node 2 repeats this transfer until there are no remaining packets. Thereby, resources are used efficiently.

  (4-1-2) FIG. 11 is a flowchart for explaining the transfer method based on the measurement of the free buffer capacity according to the first embodiment of the present invention. In the packet transfer / transmission method shown in FIG. 11, the handover source node 2 sends a “buffer free capacity measurement request” message to the handover destination node 3, and the handover destination node 3 has its own reception buffer available. The capacity is measured (step A1), and the measurement result is transmitted to the handover source node 2 as a “measurement report” message.

  When the handover source node 2 receives the “measurement report” from the handover destination node 3, the handover source node 2 determines whether or not the free capacity of the resource remains in the handover destination node 3 (step A2), and the free capacity is insufficient. If so, go through the NO route and return to the top of the process. On the other hand, if the free capacity remains, the YES route passes through the YES route, the handover source node 2 determines that there is enough free capacity, determines the pattern of the residual packet transmission method, and the handover destination node 3 Transfer data for free space (data transfer for free space). Here, the handover source node 2 adjusts the number of divisions and determines whether to transmit data in a batch or divided transmission based on a determination instruction from the upper node 1 or the base station (before and after handover).

In step A3, the handover destination node 3 stores the transferred data in the reception buffer area detected as empty in the previous measurement, and is provided inside the handover destination node 3 itself according to the stored data amount, storage time, etc. Transfer data to the designated buffer.
Therefore, the handover source node 2 of the present invention transfers the transferable packets among the remaining packets based on the resource capacity measured in the measurement step (scheduling step).

(4-1-3) Description of Distributed Transfer This distributed transfer is a method in which the handover source node 2 transmits residual packets to the handover destination node 3, and data is transmitted to the mobile device 4 in the order in which the handover destination node 3 arrives. It is.
FIG. 12 is a diagram for explaining distributed transfer according to the first embodiment of the present invention. The handover source node 2 shown in FIG. 12 does not request notification and distribution of the resource status to the handover destination node 3, and instead, the residual packet is divided (distributed) in small amounts and transmitted, and a new packet is transmitted. Residual packets are transmitted using the interval between them.

  In the transfer / transmission step of this pattern, the handover source node 2 divides the residual packet into a plurality of packets having a data amount corresponding to the communication rate in the radio section (dividing step), The divided packet is transmitted to the handover destination node 3 (divided transmission step). Then, the handover destination node 3 sends a plurality of packets in which a plurality of divided packets transmitted in this divided transmission step and a plurality of new packets transmitted from the upper node 1 are mixed to the mobile device 4 based on the reception order. In response to this, it is transmitted (arrival order transmission step).

As a result, the handover source node 2 transmits the residual packets in a distributed manner using periodic transmission or random interval transmission, and the handover destination node 3 transmits the previously received packet regardless of the new packet or the residual packet. Is transmitted to the mobile device 4.
(4-1-4) Data transmission method between handover destination node 3 and mobile station 4 (4-1-4-1) Transfer method for changing radio transmission interval (transmission interval) When the node 2 transmits a plurality of divided packets to the handover destination node 3, the transmission interval during data (packet) transfer is changed.

  FIGS. 13A and 13B are diagrams for explaining a transfer method for changing the transmission interval according to the first embodiment of the present invention. The transmission interval T shown in FIG. 13A is a transmission interval when data (packets) from the handover source node 2 to the handover destination node 3 is not transferred, and is transmitted from the handover destination node 3 to the mobile device 4. The data transmission interval is constant over time. On the other hand, when the packet is being transferred, the handover destination node 3 shown in FIG. 13B narrows the transmission interval of the new packet and the transfer packet to the time interval T ′ and transmits the packet to the mobile device 4. It has become. In FIG. 13B and FIG. 14B to be described later, what is displayed as new and transferred represents a new packet and a transferred packet, respectively.

  The transmission interval of new packets is determined by the upper node 1, and the handover destination node 3 is notified of the transmission interval by a transport channel change request from the upper node 1. Further, the transmission interval of the transfer packet is determined by the upper node 1 in the case of HS-DSCH, and is determined by the handover source node 2 in the case of DSCH. This is because in the case of HS-DSCH, the upper node 1 is the RNC 2-0, 2-1, and the call control is performed for the base stations 3-1 and 3-2 of the lower node. Further, in the case of DSCH, the lower nodes are RNCs 2-0 and 2-1, and call control is performed for the exchange 1 that is the upper node.

With this transfer method, both the transferred residual packet and the new packet can be transmitted efficiently, and the communication rate increases. This also increases the communication rate by changing the data transmission interval among the factors that determine the communication rate.
In this way, by increasing or changing the amount of information that can be wirelessly transmitted in accordance with an instruction from the upper node 1, the capacity of the buffer 3g of the handover destination node 3 can be made constant, and can contribute to optimization of radio resources.

(4-1-4-2) The unit data amount transmitted from the handover destination node 3 to the mobile device 4 can be increased.
FIGS. 14A and 14B are diagrams for explaining a method of changing the unit data amount transmitted from the handover destination node 3 to the mobile device 4 according to the first embodiment of the present invention. When the transfer shown in FIG. 14 (a) is not in progress, the transmission amount “1” for transmitting new data is set, while when the transfer shown in FIG. 14 (b) is in progress, the transmission amount “2” is set. Is done. That is, when the handover source node 2 performs transmission, the handover source node 2 changes the data amount (increase from the transmission amount “1” to the transmission amount “2”) in the unit transmission interval. Yes.

  In other words, the difference from (4-1-4-1) is that (4-1-4-1) increases the communication rate by changing the transmission interval, whereas FIG. The arbitration method shown in (b) is that the communication rate is increased by increasing the amount of data that can be transmitted at one time without changing the transmission interval. Moreover, (4-1-4-1) and this pattern can also be combined.

Note that the handover destination node 3 is notified of the transmission interval by a transport channel change request from the upper node 1. Further, the transmission interval of the transfer packet is determined by the upper node 1 in the case of HS-DSCH, and is determined by the handover source node 2 in the case of DSCH.
As a result, the residual packet and the new packet can be transmitted simultaneously, and the communication rate increases.

(4-1-5) Method for Adding Transport Channel for Data Transfer FIGS. 15A and 15B show a method for adding a transport channel for data transfer according to the first embodiment of the present invention. It is a figure for demonstrating. FIG. 15A is a diagram showing the flow of user data when not being transferred. The handover source node 2 or the handover destination node 3 transmits the user data to the mobile device 4 through the transport channel.

  FIG. 15B shows a case where transfer is in progress, and the upper node 1 additionally sets a transport channel for transferring a residual packet from the handover source node 2 to a transport channel for transmitting a new packet. Here, the arbitrating unit (MUX) 3h arbitrates transfer data from the handover source node 2 and new data from the upper node 1. The handover destination node 3 determines data to be transmitted using each transport channel based on the data rate in each transport channel and the upper limit data rate when both channels are combined or the priority of each transport channel. .

In the packet transfer / transmission method of the present invention, the upper node 1 allocates a separate transfer channel from a part of the transfer channel between the handover destination node 3 and the handover source node 2 based on the packet amount in the radio section. Secure (channel setting step).
As an example of channel allocation, the transport channel for transfer data and the transport channel for new data shown in FIG. 15B are secured, and the transfer data and the transfer data are transferred to the handover destination node 3 via these two transport channels. New data is transferred and transmitted. Further, the arbitration unit 3h of the handover destination node 3 arbitrates packets received from these two types of transport channels.

  Then, the handover destination node 3 schedules packet transmission using a part of the separate transfer channels secured in the channel setting step and the new channel (scheduling step), and assigns the new packet and the residual packet in the scheduling step. Based on the scheduling, it transmits to the mobile device 4 (scheduling transmission step).

  The handover destination node 3 adds a transport channel for residual packet transfer according to an instruction from the upper node 1, and transmits both the transport channel for transfer and the normal transport channel to the mobile device 4 via radio. Scheduling is performed according to the amount of transmission data to be transmitted, and the packet transmitted according to the scheduling is transmitted to the mobile device 4.

  Further, the arbitrating unit 3h shown in FIG. 15B has two types of arbitration methods based on the priority of the packet, and the case where the priority of the transfer data is higher than the priority of the new data, For the two types of cases where the priority and the priority of new data are the same, scheduling transmission or scheduling reception is performed, and the packet is transmitted to the mobile device 4.

In the W-CDMA system 50, this scheduling is similar to scheduling and priority control by TFCS (Transport Format Combination Set) in a MAC (Media Access Control) layer.
The upper node 1 can also assign a new channel instead of assigning a transfer channel separately from the transfer channel.

Thus, the real-time property of communication is improved and the quality of service is improved.
(4-1-6) Method for Allocating or Adding ARQ Subchannel for Data Transfer FIGS. 16 (a) to 16 (d) are transfers for changing the configuration of the subchannel according to the first embodiment of the present invention. It is a figure for demonstrating a method. Here, both FIG. 16A and FIG. 16C (representing the same thing as FIG. 16A) are cases in which no transfer is in progress, and FIG. 16B and FIG. (D) shows a case where transfer is in progress.

The handover destination node 3 shown in FIGS. 16 (a) to 16 (d) changes the frame format of the radio section with the mobile device 4.
The time of the entire portion of subchannel 1 (Sub CH-1) to subchannel n (Sub CH-n) shown in FIGS. 16A and 16B corresponds to the waiting time from data transmission to delivery confirmation. For a node that has transmitted a packet, the time from the packet transmission to the reception of the ACK. Note that n represents a natural number. The subchannel n in the waiting time shown in FIG. 16B is allocated for transmission of transfer data.

  In the reproduction method such as the HS-DSCH channel in the W-CDMA system 50, in order to simplify the retransmission protocol, the side that has transmitted the packet until receiving an acknowledgment (ACK) from the destination node, Do not send the next data. In this reproduction method, the upper node 1 divides the waiting time into a plurality of subchannels and transmits them separately in parallel.

  Also, subchannel n + 1 in the waiting time shown in FIG. 16D is assigned for transfer data, and subchannel n is assigned for new data, but the waiting time shown in FIG. And different. For example, data transmitted on the subchannel 1 reaches the mobile device 4, and the data is ARQ processed in the mobile device 4. Therefore, the base station receives the ACK from the mobile device 4 at a time after the subchannel n.

For this reason, in the packet transmission / transfer method of the present invention, the time from when the base station transmits subchannel 1 until it receives the ACK is shown in FIG. The channel n is divided.
Thereby, when a plurality of subchannels are used, the handover destination node 3 allocates a part of the subchannel or adds a subchannel exclusively for the transfer data from the handover source node 2, and the new packet and the transfer data Can be sent in parallel.

In this way, by changing the retransmission-considered frame format for wireless transmission using an instruction from the upper node 1, the capacity of the buffer 3g of the handover destination node 3 can be made constant, which can contribute to optimization of radio resources.
(5) Description of an Operation Sequence Example of Pattern B With this configuration, a sequence example regarding a transfer / transmission method of a transfer packet that transmits a new packet and is not encapsulated even during transfer of a residual packet is shown in FIGS. Will be described. The names shown in FIGS. 17 to 19 that have the same names as those described above have the same or similar functions, and will not be further described. Also, ARQ represents an ARQ function provided in each node.

(5-1) Transfer Method by Resource Allocation Request FIG. 17 is a sequence example for explaining the transfer method by the resource allocation request according to the first embodiment of the present invention. (5-1-1) to (5-1-9) correspond to reference numerals 1 to 9 in FIG.
(5-1-1) The mobile device 4 starts handover due to a decrease in the received signal quality. The cause of the handover is a determination of the upper node 1 based on a request from the mobile device 4 or a radio status report from the mobile device 4. Here, the upper node 1 determines the handover execution (HO execution), and the mobile device 4 transmits a handover preparation request to the handover destination node 3 in order to start the handover.

  (5-1-2) The upper node 1 requests the handover destination node 3 to secure a resource accommodating the mobile device 4 to be handed over. Specifically, when the handover destination node 3 receives this request, when the message transmission / reception between the upper node 1 and the handover destination node 3 is first, the handover destination node 3 newly activates the shared channel and sets the shared transport channel. It starts up to prepare for handover, and transmits handover preparation completion to the upper node 1. If there is a channel already activated, a user is added.

In preparation for the handover, the shared channel for accommodating the mobile device 4 to be handed over is secured as a resource in the handover destination node 3.
Upon receiving this completion, the upper node 1 notifies the handover source node 2 of the handover execution permission, and transmits a handover execution request to the mobile device 4.

(5-1-3) The upper node 1 permits the handover source node 2 to execute the handover.
(5-1-4) The upper node 1 transmits a handover instruction (handover execution request) to the mobile device 4. The mobile device 4 secures a handover destination node 3 and a communication channel according to the instruction.

(5-1-5) A bearer channel for transferring data remaining in the handover source node 2 to the handover destination node 3 is set. This bearer channel may be set so as to directly connect between the handover source node 2 and the handover destination node 3 or may be set so as to pass through the upper node 1.
(5-1-6) In addition, the handover source node 2 transmits a request for allocating resources necessary for transmitting the residual packet to the handover destination node 3. After receiving this request, the handover destination node 3 secures the requested amount of resources and notifies the handover source node 2 of resource reservation.

(5-1-7) When the handover source node 2 receives the resource reservation notification, it starts to transfer the residual packet. The handover destination node 3 transmits the transferred residual packet and new packet to the mobile device 4 according to the allocated resource.
(5-1-8) When the transfer of the residual packet is completed, the handover source node 2 releases the resources secured by the handed over mobile device 4.

(5-1-9) The upper node 1 releases the bearer channel set for residual packet transfer.
In this way, residual data can be avoided even when a variable communication rate is used, and an increase in retransmission can be prevented.
(5-2) Arbitration Method by Distributed Transfer FIG. 18 is a sequence example for explaining the transfer method by distributed transfer according to the first embodiment of the present invention. (5-2-1) to (5-2-9) correspond to reference numerals 1 to 9 in FIG.

(5-2-1) The handover starts due to the deterioration of the signal quality received by the mobile device 4. The cause of the handover is based on the determination of the upper node 1 based on the request from the mobile device 4 or the radio status report from the mobile device 4.
(5-2-2) The upper node 1 requests the handover destination node 3 to secure a resource accommodating the mobile device 4 to be handed over. The handover destination node 3 secures resources based on this request. When the message transmission / reception between the upper node 1 and the handover destination node 3 is first, the shared channel is newly activated, the shared transport channel is activated to prepare for handover, and the handover preparation completion is set to the upper node 1. Send to. If there is a channel already activated, a user is added.

(5-2-3) The upper node 1 permits the handover source node 2 to execute the handover.
(5-2-4) The upper node 1 transmits a handover instruction to the mobile device 4. The mobile device 4 secures a handover destination node 3 and a communication channel according to the instruction.
(5-2-5) A bearer channel for transferring data remaining in the handover source node 2 to the handover destination node 3 is set. This bearer channel may be directly connected between the handover source node 2 and the handover destination node 3 or may be set via the upper node 1.

(5-2-6) The upper node 1 requests the handover source node 2 to transfer the residual packet.
(5-2-7) The handover source node 2 distributes and transfers the remaining packets little by little to the handover destination node 3. The handover destination node 3 transmits the transferred residual packet and new packet to the mobile device 4 in the order of arrival.

(5-2-8) When the transfer of the residual packet is completed, the handover source node 2 releases the resources reserved by the handed over mobile device 4.
(5-2-9) The upper node 1 releases the bearer channel set for the residual packet transfer.
In this way, since the residual packet is transferred using the interval between transmissions of new packets, efficient transfer is possible.

(5-3) Transmission interval / information amount change, transport channel addition and subchannel configuration change FIG. 19 shows transmission interval / information amount change, transport channel addition and subchannel according to the first embodiment of the present invention. It is an example of a sequence for explaining a change method of composition. (5-3-1) to (5-3-10) correspond to reference numerals 1 to 10 in FIG.

(5-3-1) The handover starts due to the deterioration of the signal quality received by the mobile device 4. The cause of the handover is based on a determination in the upper node 1 based on a request from the mobile device 4 or a radio status report from the mobile device 4.
(5-3-2) The upper node 1 requests the handover destination node 3 to secure a resource accommodating the mobile device 4 to be handed over. The handover destination node 3 secures resources based on this request. In addition, when message transmission / reception between the upper node 1 and the handover destination node 3 is first, the shared channel is newly activated, the shared transport channel is activated to prepare for handover, and handover completion is completed. 1 is transmitted. If there is a channel already activated, a user is added.

(5-3-3) The upper node 1 permits the handover source node 2 to execute the handover.
(5-3-4) The upper node 1 transmits a handover instruction to the mobile device 4. The mobile device 4 secures a handover destination node 3 and a communication channel according to the instruction.
(5-3-5) A bearer channel for transferring data remaining in the handover source node 2 to the handover destination node 3 is set. This bearer channel may be directly connected between the handover source node 2 and the handover destination node 3 or may be set via the upper node 1.

  (5-3-6) After setting the transfer bearer channel, the upper node 1 adds the transfer transport channel so that the transfer data and the new packet can be transmitted to the handover destination node 3 in parallel. The transport channel is requested to be changed, such as changing the transmission interval of the transport channel or increasing the amount of transmission information of the transport channel. The handover destination node 3 updates the transport channel in response to a request from the upper node 1.

(5-3-7) The upper node 1 requests the handover source node 2 to transfer the residual packet. When the handover source node 2 receives the request, the handover source node 2 starts transmitting the residual packet to the handover destination node 3.
(5-3-8) After the transfer of the residual packet is completed, the handover source node 2 notifies the upper node 1 of the transfer completion. After receiving the transfer completion notification, the upper node 1 transmits a transport channel change request again to the handover destination node 3 so that the transport channel added or changed before the transfer is returned to the initial setting before the change. Request. The handover destination node 3 returns the transport channel setting to the state before the handover according to the request from the upper node 1.

(5-3-9) When the transfer of the residual packet is completed, the handover source node 2 releases the resources secured by the handed over mobile device 4.
(5-3-10) The upper node 1 releases the bearer channel set for residual packet transfer.
In this way, the number of users that can be accommodated while maintaining a wide bandwidth can be maintained, lines can be shared efficiently during soft handover, data residue can be avoided even when a variable communication rate is used, and retransmission can be increased. It becomes possible to prevent.

(B) Description of Second Embodiment of the Invention When the handover source node 2 transfers a residual packet to the handover destination node 3, since a wired transmission path is used, signal loss and signal corruption almost occur. Absent. For this reason, in the patterns A and B, the residual packet is transferred in a state where no overhead is added to guarantee the integrity of data communication such as a retransmission protocol.

  On the other hand, in the patterns C and D described in the second embodiment, when a residual packet is transferred from the handover source node 2 to the handover destination node 3, overhead is added and encapsulated. It has become. Thereby, the integrity of data communication from the handover source node 2 to the handover destination node 3 is guaranteed, and the integrity of data communication from the handover source node 2 to the mobile device 4 is also guaranteed.

Note that the W-CDMA system in the second embodiment is the same as the W-CDMA system 50.
(6) Description of Encapsulation of Transfer Data According to Second Embodiment When the handover source node 2 transmits the buffered data to the handover destination node 3 from the handover source node 2 It is a frame of a residual packet to be transmitted. The handover source node 2 does not disassemble or assemble the frame header of the residual packet, and the handover destination node 3 performs the residual based on the instruction from the upper node 1 or the identification information included in the received residual packet. A method of encapsulating packets (tunneling method) is used. In addition, the handover destination node 3 finishes the encapsulation process when all the residual packets buffered in the handover source node 2 have been transmitted to the mobile device 4 and the residual packets to be transmitted to the mobile device 4 disappear. .

This encapsulation ensures the integrity of data communication and enables high-speed processing.
Regarding the encapsulation, the retransmission protocol used when the handover source node 2 was transmitting / receiving to / from the mobile device 4 before the handover is between the handover source node 2, the handover destination node 3 and the mobile device 4. Is used when transferring data.

  Here, also in data communication between the handover destination node 3 and the mobile device 4, there is a retransmission protocol used when data is transmitted / received between the handover destination node 3 and the mobile device 4. Therefore, two types of protocol headers, that is, a protocol header assigned by the handover source node 2 and a protocol header assigned by the handover destination node 3 are assigned to the same transfer data.

(7) Two types of header attaching methods The method of attaching two types of headers to transfer data and transmitting them to the mobile device 4 can be roughly classified into two types (M1) and (M2).
(M1) The protocol header of the handover source node 2 and the transferred user data are encapsulated into one, and this encapsulated data is further given the protocol header of the handover destination node 3.

(M2) When the handover destination node 3 receives the transfer data, the protocol header assigned by the handover source node 2 is removed, and the protocol header assigned by the handover destination node 3 is added to the transfer data.
Hereinafter, the above two types of methods will be described in detail, and the sequence of control signals and user data between the nodes will be described.

(7-1) Aspect of Encapsulation FIGS. 20A and 20B to FIG. 24 are diagrams for explaining a packet transfer method according to the second embodiment of the present invention. These are shown in these figures and have the same or similar functions as those described above. ARQ-H shown in FIG. 20 represents an ARQ header. In the case of HS-DSCH, ARQ-H means “header” of “H-ARQ”.

  When the mobile device 4 shown in FIG. 20A starts handover, the handover source node 2 detects quality degradation. The handover destination node 3 attaches a header for H-ARQ (shown as ARQ-H) to the user data from the upper node 1 with this detection as a trigger (see FIG. 20B). In addition, when the header is added, the upper node 1 detects quality degradation and notifies the handover source node 2 of the quality deterioration.

Next, the handover source node 2 illustrated in FIG. 21 transmits a suspend request to the upper node 1 and stops the transmission of a new packet for residual packet transfer.
The handover source node 2 shown in FIG. 22A transfers the residual packet to the handover destination node 3 via the upper node 1, and the handover destination node 3 transmits the residual packet to the mobile device 4, where The handover destination node 3 adds a header for H-ARQ to the header-added packet from the handover source node 2 (see FIG. 22B).

After the residual packet transfer is completed, the handover source node 2 illustrated in FIG. 23 transmits a resume (resume) request to the upper node 1 to resume new packet transmission.
Then, the upper node 1 shown in FIG. 24A transmits a new packet to the handover destination node 3, and the handover destination node 3 transmits the new packet to the mobile device 4. Here, the handover destination node 3 attaches a header for H-ARQ to the new packet (see FIG. 24B).

Therefore, when transferring / transmitting, the handover source node 2 encapsulates the residual packet (first encapsulation) according to an instruction from the upper node 1 or identification of the received frame, and the handover destination node 3 encapsulates the residual packet ( The second packet is transmitted, and the residual packet is transmitted to the mobile device 4.
In this way, the protocol header of the handover source node 2 and the transferred user data are encapsulated into one, and this encapsulated data is further transmitted at the handover destination node 3 by the protocol header of the handover destination node 3. It is given separately.

Hereinafter, attaching the protocol header given by the handover source node 2 to the protocol header given by the handover destination node 3 is referred to as “carpooling”.
(7-2) Explanation of carpooling When the carpooling is carried out, when transferring / transmitting, the handover destination node 3 identifies the packet encapsulated in the frame transmitted to the mobile device 4 and the normal packet. The identification information (information element) to be inserted is inserted. That is, the identification information is inserted into the packet so that the ARQ of the mobile device 4 can normally monitor two types of ARQ. This insertion method can use the following four patterns.

(7-2-1) A pattern in which a packet is instructed to share and the header and data length of the transfer data and the new packet are the same. FIGS. 25 (a) and 25 (b) respectively It is a figure for demonstrating the 1st frame format which concerns on 2nd Embodiment of this invention. The frame shown in FIG. 25A is obtained by packetizing transfer data from the handover source node 2 by the handover destination node 3, and includes a header provided by the handover destination node 3 and a header provided by the handover source node 2. And three types of areas of user data. The header assigned by the handover destination node 3 includes a sequence number (SN) indicating an identification number assigned to each data or each radio frame, and whether or not it is shared (the protocol header is assigned again). Identification information for indicating whether or not).

  The frame shown in FIG. 25B is a packet of new data from the upper node 1. Although this new packet does not carry out carpooling, the handover destination node 3 always assigns an area of a size necessary for inserting the protocol header of the handover source node 2 to the new packet as an unused area. Thus, the data length of the new packet including the header portion and the data portion is made the same as the data length of the transfer packet.

Therefore, when transferring / transmitting, the handover destination node 3 always secures a header area for residual packets in a frame transmitted to the mobile device 4. This eliminates the need for the mobile device 4 to distinguish between encapsulated data and normal non-encapsulated information.
Further, the handover destination node 3 can store the handover source node 2 that has transmitted the sequence number, thereby transmitting a response signal such as a conversion request, a retransmission request based on a retransmission protocol, or a reception completion to the handover source node 2, respectively. .

  Then, the mobile device 4 recognizes the presence or absence of the next header based on this identification information, and if there is a next header (instructed that the next header is given), reads the next protocol header and shares Get protocol information. If there is no next header (the next header is not instructed to be assigned), the mobile device 4 does not read the contents of the next protocol header area as an invalid area.

Thus, the handover destination node 3 can recognize the presence or absence of the next header area as a part of the protocol header. In addition, since the transfer data and the new packet have the same header and data length, the mobile device 4 can simplify the header recognition processing procedure.
(7-2-2) There is an area for instructing carpooling, and the header lengths of the transfer data and the new packet are different patterns. FIGS. 26 (a) and 26 (b) are diagrams according to the second embodiment of the present invention. FIG. 3 is a diagram for explaining a frame format 2; The frame shown in FIG. 26A is transferred from the handover source node and is provided with the ARQ header by the handover destination node 3. Here, the ARQ header given by the handover destination node 3 has an area indicating the presence of the next header area. Accordingly, the handover destination node 3 includes, as a part of the protocol header, identification information indicating whether or not carpooling is performed, that is, whether or not the protocol header is next assigned again in the part of the header. As a result, the protocol header given by the handover source node 2 is carried on the protocol header given by the handover destination node 3.

On the other hand, since the protocol header of the handover source node 2 is not added to a new packet that does not carry out sharing (see FIG. 26B), the data length of the transfer data is different from the data length of the new packet. Therefore, both the handover destination node 3 on the transmission side and the mobile device 4 on the reception side are provided with means (not shown) for identifying two or more types of data lengths.
(7-2-3) A pattern for instructing car sharing is used, and the data length and header length of the transfer data and the new packet are different. FIGS. 27A and 27B show the second embodiment of the present invention. It is a figure for demonstrating the 3rd frame format which concerns on a form. As a part of the protocol header shown in FIG. 27A, the handover destination node 3 includes identification information indicating whether or not carpooling is performed, that is, whether or not the protocol header is next given again. , Carpooling.

  In addition, since a new packet that does not carry out carpooling (see FIG. 27B) is not given the protocol header of the handover source node 2, the handover destination node 3 changes the length of the data part to change the header length difference. In addition, by combining both the data part and the header part, the transmission data length is made the same as the transfer data. For this reason, the receiving-side mobile device 4 reads the protocol header again and acquires the information of the protocol that is sharing, when the next header is instructed by the identification information. If there is no instruction, the mobile device 4 processes that user data continues.

(7-2-4) Header Compression FIGS. 28A and 28B are diagrams for explaining a fourth frame format according to the second embodiment of the present invention. The frame shown in FIG. 28A is given identification information indicating “header compression exists”, and the header lengths of the transfer data and the new packet are the same, and the data lengths are also the same. Both the handover source node 2 and the handover destination node 3 compress the protocol header to shorten the header length, and compensate for the increase in the transmission data length due to the sharing of the protocol header, thereby making the transmission data length the same as the new packet. Yes.

Therefore, the mobile device 4 on the receiving side can recognize whether or not header compression is performed based on the identification information included as a part of the protocol header. When header compression is instructed by the identification information, the mobile device 4 breaks down the read protocol header into a protocol header that carries it together and a protocol header that carries it together.
On the other hand, the mobile device 4 reads the header and data as it is when there is no instruction for carpooling, for example, as in the frame shown in FIG.

(7-3) Description of operation when encapsulated By such a configuration, the encapsulated residual data is transferred.
FIG. 29 is a sequence example for explaining a residual packet transfer method by encapsulation according to the second embodiment of the present invention. “ARQ” displayed on each of the mobile device (UE) 4, the handover source node and the handover destination node shown in FIG. 29 is an ARQ control unit 4d (see FIG. 5), an ARQ control unit 2d (see FIG. 3) and an ARQ. This represents the control unit 3d (see FIG. 4), and the same applies to other drawings. Others have the same or similar functions as those described above. (7-3-1) to (7-3-11) correspond to reference numerals 1 to 11 in FIG. 29, respectively.

(7-3-1) The handover starts due to the deterioration of the signal quality received by the mobile device 4. Here, the cause of the handover is a determination in the upper node 1 based on a request from the mobile device 4 or a radio status report from the mobile device 4.
(7-3-2) The upper node 1 requests the handover destination node 3 to secure resources for accommodating the mobile device 4 to be handed over, and the handover destination node 3 secures resources based on this request. To do. When the message transmission / reception between the upper node 1 and the handover destination node 3 is the first, the handover destination node 3 newly activates the shared channel. If there is an already activated channel, the handover destination node 3 adds a user.

  (7-3-3) The upper node 1 permits the handover source node 2 to execute the handover. When the handover source node 2 receives the permission, the handover source node 2 transmits a suspend request to the upper node 1 and stops transmission of a new packet. In this sequence, instead of the handover source node 2 sending a suspend request, the upper node 1 itself can stop sending a new packet.

(7-3-4) The upper node 1 transmits a handover instruction to the mobile device 4. The mobile device 4 secures a handover destination node 3 and a communication channel according to the instruction.
(7-3-5) In this handover, the mobile station 4 is provided for the handover source node 2 (in addition to the activated retransmission protocol entity provided opposite to the handover source node 2), and further Then, the retransmission protocol entity for the handover destination node 3 is activated.

  (7-3-6) A bearer channel for transfer is set between the handover source node 2 and the upper node 1, and data remaining in the handover source node 2 is transferred to the handover destination node 3 by the upper node 1 The path to do is set. Note that this bearer channel may be directly connected between the handover source node 2 and the handover destination node 3.

(7-3-7) The upper node 1 requests the handover source node 2 to transfer the residual packet. In accordance with this request, the handover source node 2 transfers the residual packet to the handover destination node 3 using the bearer channel set in (7-3-6).
The handover destination node 3 receives the residual packet from the handover source node 2 and transmits it to the mobile device 4. At this time, the handover source node 2 assigns a protocol header to the transfer data and transfers it before the handover. The handover destination node 3 transmits its own protocol header on the transfer data to the mobile device 4.

  (7-3-8) When the transfer of the remaining packet is completed, the handover source node 2 releases the resources secured by the handed over mobile station 4 and outputs a resume request to the upper node 1 to create a new packet Request to resume sending. Note that although the handover source node 2 outputs a resume request, the upper node 1 itself may perform the sequence.

(7-3-9) Upon receiving the resume request, the upper node 1 releases the bearer channel set for residual packet transfer.
(7-3-10) The upper node 1 instructs the mobile device 4 to release the retransmission protocol entity for the handover source node 2. The mobile device 4 releases the retransmission protocol entity for the handover source node 2 according to the instruction.

(7-3-11) Restart transmission of a new packet.
Thus, the protocol header of the handover source node 2 and the transferred user data are encapsulated, and the encapsulated data is given the protocol header of the handover destination node 3.
In this way, the integrity of data communication from the handover source node 2 to the handover destination node 3 is ensured, and the integrity of data communication from the handover source node 2 to the mobile device 4 is also guaranteed.

(7-4) Method for Reattaching Protocol Header When the handover destination node 3 receives the transfer data, the handover destination node 3 removes the protocol header assigned by the handover source node 2 and newly adds a protocol header. In the method (M1), the protocol headers assigned by the handover source node 2 and the handover destination node 3 are used. However, in the method (M2), the protocol header is not assigned with two types of protocol headers. Reattach the header. This retransmission control can use the following two patterns, whereby retransmission control similar to (M1) is performed.

(7-4-1) Method of providing a correspondence table between the header given by the handover source node 2 and the header given by the handover destination node 3 FIG. 30 shows a correspondence table according to the second embodiment of the present invention. It is a figure for demonstrating the method to add header information to transfer data using it. The handover destination node 3 shown in FIG. 30 has a correspondence table 10 between the header given by the handover source node 2 and the header given by the handover destination node 3. For example, for the transfer packet of the user A at the handover source node 2, the ARQ information at the handover source node 2, the user name, and the ARQ information (own ARQ information) at the handover destination node 3 are associated with each other in the correspondence table 10 Is recorded. Here, the ARQ information in the handover source node 2 is, for example, SNR (Signal Noise Ratio) information included in the protocol header provided in the handover source node 2. The ARQ information in the handover destination node 3 is protocol header information given in the handover destination node 3 or the like.

Then, by associating these pieces of information with each other and recording them in the correspondence table 10, it is possible to transfer from the protocol header of the handover source node 2 to the protocol header of the handover destination node 3, so that the handover destination node 3 The packet transmitted to 4 can manage the retransmission protocol using one type of protocol header.
In addition, since what has the same code | symbol as what was shown above in FIG. 30 has the same thing or the same function, the further description is abbreviate | omitted.

  Here, the handover destination node 3 receives new packets from a plurality of users, and since the packets are transferred from the plurality of handover source nodes 2, the correspondence table 10 identifies entities in the handover source node 2. By recording information (for example, user identification information or line identification information), a plurality of users and a plurality of handover source nodes 2 are identified.

  Regarding the processing of the handover destination node 3, the processing method in the case of data transmission in the direction of the handover source node 2, the handover destination node 3, and the mobile device 4 is the user of the data received by the handover destination node 3 from the handover source node 2. The name and its ARQ information are stored. Next, the line termination unit 2b (see FIG. 3) of the handover destination node 3 transmits data excluding the ARQ header to the ARQ control unit 3d (see FIG. 3). Then, the own ARQ information assigned by the ARQ control unit 3d and the stored ARQ information of the handover source node 2 are written in the correspondence table 10 as a pair.

  On the other hand, in the case of the direction of the mobile device 4, the handover destination node 3 and the handover source node 2, the reception unit 2a (see FIG. 3) of the handover destination node 3 sends the ARQ control unit 3d of the handover destination node 3 to the ARQ control unit 3d. ACK is received. Next, the handover destination node 3 (ARQ information) included in the ACK is searched from the correspondence table 10, and the user name of the handover source node 2 and the ARQ information of the handover source node 2 are extracted. Then, an ACK created from the ARQ information of the extracted handover source node 2 is transmitted to the extracted user (handover source node 2).

  Then, the handover destination node 3 compares the own entity information determined based on the confirmed (ACK) and unconfirmed (NACK) information received from the mobile device 4 with the correspondence table 10, and based on this comparison, the handover destination node 3 The destination node 3 identifies the handover source node 2 to which the data has been transferred, converts the ACK / NACK information, and transmits the converted ACK / NACK information to the handover source node 2.

As described above, when transferring / transmitting, the handover destination node 3 determines that the mobile station 4 and the mobile station 4 are based on the correspondence table 10 between the header given by the handover source node 2 and the header given by the handover destination node 3. Send and receive frames.
(7-4-2) Header Assigned at Handover Source Node 2 and Termination Method at Handover Destination Node 3 FIG. 31 shows a header assigned at the handover source node 2 according to the second embodiment of the present invention. FIG. 4 is a diagram for explaining a method of terminating at a handover destination node 3. The handover destination node 3 shown in FIG. 31 has a termination processing unit 11. The termination processing unit 11 terminates the ARQ given by the handover source node 2 included in the transfer data (transfer packet), acquires only the user data, and returns an ACK to the handover source node 2. is there.

  Then, the transfer packet at the handover source node 2 is given a protocol header and transmitted to the handover destination node 3, terminated at the termination processing unit 11 provided at the handover destination node 3, and transferred. ing. The handover destination node 3 confirms the transfer data received from the handover source node 2 and returns an acknowledged (ACK) signal to the handover source node 2. The handover destination node 3 removes the protocol header added by the handover source node 2 from the transfer data, adds the protocol header of its own entity, and transmits it to the mobile device 4.

In addition, what has the same code | symbol as what was shown above in what is shown in FIG. 31 represents what has the same thing or the same function.
(7-5) Explanation of Operation when Removing Header FIG. 32 is a diagram showing a sequence example for explaining the residual packet transfer method by re-attaching the protocol header according to the second embodiment of the present invention. (7-5-1) to (7-5-9) correspond to reference numerals 1 to 9 in FIG. 32, respectively.

(7-5-1) The handover starts due to the deterioration of the signal quality received by the mobile device 4. The cause of the handover is a determination of the upper node 1 based on a request from the mobile device 4 or a radio status report from the mobile device 4.
(7-5-2) The upper node 1 requests the handover destination node 3 to secure a resource accommodating the mobile device 4 to be handed over. The handover destination node 3 secures resources based on this request. In addition, when message transmission / reception between the upper node 1 and the handover destination node 3 is first, the shared channel is newly activated, the shared transport channel is activated to prepare for handover, and handover completion is completed. 1 is transmitted. If there is a channel already activated, a user is added.

  (7-5-3) The upper node 1 permits the handover source node 2 to execute the handover. When the handover source node 2 receives the permission, the handover source node 2 transmits a suspend request to the upper node 1 and stops transmission of a new packet. In the sequence, the handover source node 2 transmits a suspend request, but may be performed by the upper node 1 itself.

(7-5-4) The upper node 1 transmits a handover instruction to the mobile device 4. The mobile device 4 secures a handover destination node 3 and a communication channel according to the instruction.
(7-5-5) A bearer channel for transferring data remaining in the handover source node 2 to the handover destination node 3 is set. This bearer channel may be directly connected between the handover source node 2 and the handover destination node 3 or may be set via the upper node 1.

  (7-5-6) The upper node 1 requests the handover source node 2 to transfer the residual packet. In response to this request, the handover source node 2 transfers the residual packet to the handover destination node 3 using the bearer channel set in the previous section. The handover destination node 3 receives the residual packet from the handover source node 2 and transmits it to the mobile device 4. At this time, the handover source node 2 continuously transfers the transfer data with a protocol header before the handover. In the handover destination node 3, the protocol header given in the handover source node 2 is terminated, and the own protocol header is added again and transmitted to the mobile device 4.

  (7-5-7) When the transfer of the residual packet is completed, the handover source node 2 releases the resources secured by the handed over mobile device 4 and outputs a resume request to the upper node 1 Request to resume packet transmission. Note that although the handover source node 2 outputs a resume request, the upper node 1 itself may perform the sequence.

(7-5-8) Upon receiving the resume request, the upper node 1 releases the bearer channel set for the residual packet transfer.
(7-5-9) Restart transmission of a new packet.
In this way, since the handover destination node 3 reattaches the protocol header, the number of users that can be accommodated is maintained while ensuring a wide bandwidth, and the line can be efficiently shared during soft handover.

(8) Description of Pattern D Pattern D is a method of transmitting a new packet even during transfer of a residual packet and encapsulating transfer data.
(8-1) This pattern D is transmitted to the mobile device 4 while arbitrating the transfer data remaining in the handover source node 2 and the new packet transmitted from the upper node 1 in the handover destination node 3. It is supposed to send. As the arbitration method, the same method as described in the pattern B can be used.

Further, at the time of residual packet transfer, the protocol header given by the handover source node 2 is encapsulated or replaced. This method can use the same method as described in the pattern C.
33 (a), (b) to 35 (a), (b) are diagrams for explaining another packet transfer method according to the second embodiment of the present invention. These have the same or similar functions as those described above.

  When the mobile device 4 shown in FIG. 33A starts handover, the handover source node 2 detects quality degradation. The handover destination node 3 attaches a header for H-ARQ to the user data from the upper node 1 with this detection as a trigger (see FIG. 33B). In addition, when the header is added, the upper node 1 detects quality degradation and notifies the handover source node 2 of the quality deterioration.

Next, the handover source node 2 shown in FIG. 34 (a) transfers the residual packet to the upper node 1, and the handover destination node 3 while the residual packet and the new packet are mutually arbitrated from the upper node 1. Sent to. Then, the handover destination node 3 transmits the residual packet and the new packet to the mobile device 4.
Also, the user data shown in FIG. 34B is provided with H-ARQ when the handover source node 2 transfers to the upper node 1. Then, when the handover destination node 3 transmits the packet transferred from the upper node 1 to the mobile device 4, H-ARQ is further added to carry out carpooling.

Furthermore, when the handover source node 2 shown in FIG. 35A completes the transfer of the residual packet, the upper node 1 transmits a new packet to the handover destination node 3. Here, the handover destination node 3 adds a header for H-ARQ to the new packet shown in FIG.
(8-2) Alignment A method for adjusting the length so that the radio frame length does not become longer due to carpooling when using encapsulation will be described. The shared header is an H-ARQ header inserted into the transfer packet by the handover source node 2 and the handover destination node 3, respectively, and the radio frame length exceeds the predetermined format length by adding this shared header or the like. Occurs.

  When this situation occurs, in order to adapt (align) to the radio frame format, the handover destination node 3 is able to determine the radio frame length by using data length reduction, data division or header compression on the residual packet side. Fit to format length. The handover destination node 3 stores a response signal such as a retransmission request or reception completion by the conversion and retransmission protocol to the handover source node 2 by storing from which base station the sequence number is transmitted. It is preferable to transmit and receive each.

On the other hand, the handover destination node 3 can notify the upper node 1 of the situation and output an instruction for the upper node 1 to lengthen the radio frame format to each node.
That is, when transferring / transmitting, the handover destination node 3 monitors the capacity of the shared frame including the protocol header added by the handover source node 2 and the protocol header added to the frame transmitted to the mobile device 4 (monitoring). Step), when the handover destination node 3 exceeds the predetermined value in the monitoring step, the sharing destination frame 3 is aligned by shortening the sharing frame or increasing the radio frame format (alignment step). ).

  Here, when the capacity of the carpool frame exceeds a predetermined capacity, for example, when the amount of information transmitted from the handover destination node 3 to the mobile device 4 is reduced, an excessive transfer packet or new packet is In addition to the case of receiving (see FIGS. 13A and 13B), as a result of carpooling, the combined length of the header part and the data part exceeds the specified length (FIGS. 25A and 25B). To FIG. 28 (a), (b)) and the like.

When a situation that exceeds the radio frame format occurs at the time of carpooling, the handover destination node 3 is aligned and shortens the packet length of the residual packet. Specifically, the data portion of the residual packet is shortened, the header portion is compressed, and the data portion of the residual packet is divided.
Further, instead of shortening the transmission packet length, the frame format of the radio section can be increased. That is, at the time of alignment, the handover destination node 3 can set a radio frame format having a capacity larger than the capacity of the carpool frame exceeding the predetermined capacity. Specifically, when a situation that exceeds the radio frame format occurs at the time of carpooling, the handover destination node 3 notifies the information to the upper node 1 and receives an instruction from the upper node 1 to set the radio frame format length. By increasing the length, the radio frame length is matched with the data length on the remaining data side and transmitted.

(8-3) Activation time (running time)
After the handover is completed, the mobile device 4 receives a mixture of encapsulated data and normal non-encapsulated data from the handover destination node 3. Therefore, the mobile device 4 needs to be separated to identify both data. For this reason, the handover source node 2 notifies the handover destination node 3 of the timing between the beginning and the end of the data transfer period as the activation time. That is, in the transfer / transmission, the handover destination node 3 uses the activation time that can be recognized by both the handover destination node 3 itself and the mobile device 4 in the frame transmitted to the mobile device 4, thereby encapsulating. Discriminating packets from normal packets.

Here, the case of using a time as Akti coacervation time, representing the separator timing by the radio frame timing. Then, the mobile device 4 identifies, for example, the time zone before the first bit as non-encapsulated and the time zone after the first bit of the radio frame as encapsulated.
Further, when a sequence number is used as the activation time, the delimiter timing is expressed as “what number and after” of the user data. As the activation time, for example, when the sequence number is “10”, the mobile device 4 does not encapsulate the data having the sequence numbers “0” to “10”, and the data having the sequence number “10” or later. Identify as encapsulated.

The activation time is preferably determined by the upper node 1. When the upper node 1 determines this activation time, the instruction is notified to both the handover destination node 3 and the mobile device 4. These use commonly recognized activation times.
(8-4) When the handover destination node 3 confirms delivery using the mobile device 4 and the sequence number, the handover destination node 3 uses the first H-ARQ assigned by the handover source node 2. The handover destination node 3 can transmit a signal that responds to retransmission or reception completion with respect to data using. Thereby, the handover source node 2 releases the buffer 2g for data to be transmitted to the mobile device 4. Thereafter, the handover destination node 3 transmits the data transmitted from the handover source node 2 to the mobile device 4 by H-ARQ.

Accordingly, when transferring / transmitting, the handover destination node 3 uses the H-ARQ information used between the handover source node 2 and the mobile device 4 between the handover destination node 3 and the mobile device 4. It converts to H-ARQ information.
Further, for the transfer / transmission, the handover destination node 3 transmits a signal for replying retransmission or reception completion to the data using the first H-ARQ transmitted by the handover source node 2. As a result, the handover source node 2 releases the buffer for holding the packet to the mobile device 4 (release step), and the handover destination node 3 uses the second H-ARQ to transmit the data transmitted by the handover source node 2. It can also be transmitted to the mobile device 4 (transmission step).

(9) Explanation of Operation of Pattern D (9-1) With this configuration, an example of a sequence using arbitration using header sharing by encapsulation and a resource allocation request will be described.
As a sequence example, a case where a protocol header sharing method using encapsulation and an arbitration method using a resource allocation request are used, and a case where a reassignment of a protocol header and an arbitration method using a resource allocation request are used will be described. Note that a method using another arbitration method and a method of encapsulating or reattaching a protocol header may be used.

FIG. 36 is a sequence example for explaining the pattern D according to the second embodiment of the present invention. (9-1-1) to (9-1-11) correspond to reference numerals 1 to 11 in FIG.
(9-1-1) The handover starts due to the deterioration of the signal quality received by the mobile device 4. The cause of the handover is a determination in the upper node 1 based on a request from the mobile device 4 or a radio status report from the mobile device 4.

  (9-1-2) The upper node 1 requests the handover destination node 3 to secure a resource accommodating the mobile device 4 to be handed over, and the handover destination node 3 secures the resource based on this request. . In addition, when message transmission / reception between the upper node 1 and the handover destination node 3 is first, the shared channel is newly activated, the shared transport channel is activated to prepare for handover, and handover completion is completed. 1 is transmitted. If there is a channel already activated, a user is added.

(9-1-3) The upper node 1 permits the handover source node 2 to execute the handover.
(9-1-4) The upper node 1 transmits a handover instruction to the mobile device 4. The mobile device 4 secures a handover destination node 3 and a communication channel according to the instruction.
(9-1-5) In the above handover, the mobile device 4 activates a retransmission protocol entity for the handover destination node 3 in addition to the retransmission protocol entity for the handover source node 2.

(9-1-6) A bearer channel for transferring data remaining in the handover source node 2 to the handover destination node 3 is set. This bearer channel may be directly connected between the handover source node 2 and the handover destination node 3 or may be set via the upper node 1.
(9-1-7) The upper node 1 requests the handover source node 2 to transfer the residual packet.

  (9-1-8) The handover source node 2 transmits a request to the handover destination node 3 to allocate resources necessary for transmitting the residual packet. After receiving this request, the handover destination node 3 secures the requested amount of resources and notifies the handover source node 2 of resource reservation. When the handover source node 2 receives the resource reservation notification, the handover source node 2 starts to transfer the residual packet.

The handover destination node 3 transmits the transferred residual packet and new packet to the mobile device 4 according to the allocated resource. At this time, the handover source node 2 continuously transfers the transfer data with a protocol header before the handover. The handover destination node 3 transmits this transfer data to the mobile device 4 with its own protocol header.
(9-1-9) When the transfer of the residual packet is completed, the handover source node 2 releases the resources secured by the handed over mobile device 4.

(9-1-10) The upper node 1 releases the bearer channel set for residual packet transfer.
(9-1-11) The upper node 1 instructs the mobile device 4 to release the retransmission protocol entity facing the handover source node 2. The mobile device 4 releases the retransmission protocol entity for the handover source node 2 according to the instruction.

In this way, arbitration can be performed using header carpooling and resource allocation requests by encapsulation, thus ensuring the integrity of data communication.
(9-2) Explanation of Operation when Using Re-Heading and Arbitration Using Resource Allocation Request FIG. 37 explains an arbitrating method using re-heading and resource allocation request according to the second embodiment of the present invention. It is a sequence example for. (9-2-1) to (9-2-9) correspond to reference numerals 1 to 9 in FIG.

(9-2-1) The handover is started due to the deterioration of the signal quality received by the mobile device 4. The cause of the handover is a determination in the upper node 1 based on a request from the mobile device 4 or a radio status report from the mobile device 4.
(9-2-2) The upper node 1 requests the handover destination node 3 to secure a resource accommodating the mobile device 4 to be handed over. The handover destination node 3 secures resources based on this request. In addition, when message transmission / reception between the upper node 1 and the handover destination node 3 is first, the shared channel is newly activated, the shared transport channel is activated to prepare for handover, and handover completion is completed. 1 is transmitted. If there is a channel already activated, a user is added.

(9-2-3) The upper node 1 permits the handover source node 2 to execute the handover.
(9-2-4) The upper node 1 transmits a handover instruction to the mobile device 4. The mobile device 4 secures a handover destination node 3 and a communication channel according to the instruction.
(9-2-5) A bearer channel for transferring data remaining in the handover source node 2 to the handover destination node 3 is set. This bearer channel may be set so as to directly connect between the handover source node 2 and the handover destination node 3 or may be set so as to pass through the upper node 1.

(9-2-6) The upper node 1 requests the handover source node 2 to transfer the residual packet.
(9-2-7) The handover source node 2 transmits a request to the handover destination node 3 to allocate resources necessary for transmitting the residual packet. After receiving this request, the handover destination node 3 secures the requested amount of resources and notifies the handover source node 2 of resource reservation. When the handover source node 2 receives the resource reservation notification, the handover source node 2 starts to transfer the residual packet. The handover destination node 3 transmits the transferred residual packet and new packet to the mobile device 4 according to the allocated resource.

At this time, the handover source node 2 continuously transfers the transfer data with a protocol header before the handover. The handover destination node 3 terminates the protocol header given by the handover source node 2, re-attaches its own protocol header, and transmits it to the mobile device 4.
(9-2-8) When the transfer of the residual packet is completed, the handover source node 2 releases the resources secured by the handed over mobile device 4.

(9-2-9) The upper node 1 releases the bearer channel set for residual packet transfer.
In this way, remediation and reconciliation using resource allocation requests is used, so that data is transferred completely.
In addition, this invention is not limited to the embodiment mentioned above and its modification, In the range which does not deviate from the meaning of this invention, it can change and implement variously.

  In FIG. 1, when the mobile device 4 moves from, for example, the base station 3-0 to the base station 3-3, the HS-D that controls the base station 3-3 from the HS-DSCH that controls the base station 3-0. Handover is possible by switching to DSCH. Even in this case, the base station 3-0 transmits / receives a message similar to the above to the base station 3-3, the RNC 2-0 or the exchange 1, and transmits the residual data remaining in the base station 3-0 itself to the base station 3-0. Can be transferred to station 3-3. Even when DSCH is used, switching between DSCHs is possible.

(C) Others (1) In the transfer / transmission step, at least one of the handover source node 2 and the upper node 1 secures a resource for holding a residual packet to the handover destination node 3 and arbitrates. It is also possible to transmit a new packet.
(2) The transfer / transmission step includes a measurement step in which at least one of the handover source node 2 and the upper node 1 measures a capacity of a resource that holds a residual packet provided in the handover destination node 3; The handover source node 2 may include an arbitration step in which arbitration is performed by transferring a transferable packet among the remaining packets based on the resource capacity measured in the measurement step.

(3) In the transfer / transmission step, any one of the handover destination node 3, the handover source node 2 and the upper node 1 determines the number of remaining packets to be divided based on the capacity of the resource holding the new packet. It can be adjusted and adjusted.
(4) The transfer / transmission step includes a dividing step in which the handover source node 2 divides the residual packet into a plurality of packets having a data amount corresponding to a communication rate in the radio section; A divided transmission step of transmitting a plurality of divided packets divided in step 1 to the handover destination node 3; a plurality of divided packets transmitted by the handover destination node 3 in the divided transmission step; An arrival sequence transmission step of transmitting a plurality of packets mixed with the new packet to the mobile device 4 based on the reception sequence may be included.

(5) In the transfer / transmission step, the handover destination node 3 may change the transmission interval of the radio section.
(6) In the divided transmission step, the wireless transmission interval may be changed when the handover destination node 3 performs packet transfer.
(7) In the divided transmission step, the handover source node 2 may perform transmission while changing the data amount in the unit transmission interval.

(8) In the transfer / transmission step, the handover destination node 3 may change the frame format of the radio section.
(9) In the transfer / transmission step, even if the handover destination node 3 terminates the information on the retransmission control given by the handover source node 2 included in the transfer packet, acquires user data, and performs the retransmission control. Good.

(10) The transfer / transmission step may always ensure a header area for residual packets in a frame transmitted from the handover destination node 3 to the mobile device 4.
(11) In the transfer / transmission step, the handover destination node 3 monitors the capacity of the shared frame including the protocol header given by the handover source node 2 and the protocol header given to the frame transmitted to the mobile device 4. The monitoring step and the handover destination node 3 align the sharing frame using at least one of shortening the sharing frame and increasing the radio frame format when the capacity of the sharing frame exceeds a predetermined value in the monitoring step. And an align step to be included.

(12) In the align step, the handover destination node 3 may shorten the packet length of the residual packet.
(13) In the align step, the handover destination node 3 may set a radio frame format having a capacity larger than the capacity of the carpool frame exceeding a predetermined capacity.

(14) In the transfer / transmission step, an activation time that can be recognized by both the handover destination node 3 itself and the mobile device 4 is used in a frame transmitted from the handover destination node 3 to the mobile device 4. The encapsulated packet and the normal packet may be identified.
(15) In the transfer / transmission step, the handover destination node 3 stores a lower order node that has transmitted the sequence number, so that a response signal such as a conversion request, a retransmission request based on a retransmission protocol, or a reception completion is sent to the handover source node 2. You may make it transmit.

  (16) The transfer / transmission step is a signal in which the handover destination node 3 responds to retransmission or reception completion with respect to data using the first hybrid retransmission control transmitted by the handover destination node 3. The handover source node 2 releases the buffer holding the packet addressed to the mobile device 4, and the handover destination node 3 performs the second hybrid retransmission control on the data transmitted by the handover source node 2. And a transmission step of transmitting to the mobile device 4 by use.

  (17) The second transmission unit includes identification information and a packet indicating presence / absence of a shared frame including a first header added to a radio frame transmitted to the mobile device 4 and a second header added by the handover source node 2 A retransmission control header may be added based on the length.

As described above, according to the present invention, in the W-CDMA system, it is not necessary to transmit the same signal using a plurality of channels from the base station to the mobile device at the time of handover, so the number of users is increased and the communication quality is improved. Therefore, transmission paths and radio resources can be used effectively.
In addition, the loss of user data can be prevented, and the quality of each type of service is improved, such as the stability of the communication rate and the improvement of real-time performance. In addition, cost performance in the W-CDMA system is improved.

It is a block diagram of the principal part of the W-CDMA system to which this invention is applied. It is a schematic block diagram of the high-order node which concerns on 1st Embodiment of this invention. It is a block diagram of the base station which concerns on 1st Embodiment of this invention. It is a block diagram of the base station which concerns on 1st Embodiment of this invention. 1 is a block diagram of a mobile device according to a first embodiment of the present invention. It is a figure for demonstrating the packet transfer and transmission method which concerns on 1st Embodiment of this invention. (A)-(e) is a figure for demonstrating the operation | movement of the pattern A which concerns on 1st Embodiment of this invention, respectively. It is a sequence example for demonstrating the operation | movement of the pattern A which concerns on 1st Embodiment of this invention. (A)-(c) is a figure for demonstrating the pattern B which concerns on 1st Embodiment of this invention, respectively. It is a figure for demonstrating the arbitration method by the resource allocation request | requirement which concerns on 1st Embodiment of this invention. 4 is a flowchart for explaining a transfer method based on measurement of an empty buffer capacity according to the first embodiment of the present invention. It is a figure for demonstrating the distributed transfer which concerns on 1st Embodiment of this invention. (A), (b) is a figure for demonstrating the transfer method which changes the transmission interval which concerns on 1st Embodiment of this invention, respectively. (A), (b) is a figure for demonstrating the method to change the unit data amount transmitted to the mobile apparatus from the handover destination node which concerns on 1st Embodiment of this invention, respectively. (A), (b) is a figure for demonstrating the method to add the transport channel for data transfer which concerns on 1st Embodiment of this invention, respectively. (A)-(d) is a figure for demonstrating the transfer method which changes the structure of the subchannel which concerns on 1st Embodiment of this invention, respectively. It is a sequence example for demonstrating the transfer method by the resource allocation request | requirement which concerns on 1st Embodiment of this invention. It is a sequence example for demonstrating the transfer method by the distributed transfer which concerns on 1st Embodiment of this invention. It is a sequence example for demonstrating the change of the transmission interval / information amount which concerns on 1st Embodiment of this invention, a transport channel addition, and the change method of a subchannel structure. (A), (b) is a figure for demonstrating the 1st packet transfer method which concerns on 2nd Embodiment of this invention, respectively. It is a figure for demonstrating the 2nd packet transfer method which concerns on 2nd Embodiment of this invention. (A), (b) is a figure for demonstrating the 3rd packet transfer method which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the 4th packet transfer method which concerns on 2nd Embodiment of this invention. (A), (b) is a figure for demonstrating the 5th packet transfer method based on 2nd Embodiment of this invention. (A), (b) is a figure for demonstrating the 1st frame format which concerns on 2nd Embodiment of this invention, respectively. (A), (b) is a figure for demonstrating the 2nd frame format which concerns on 2nd Embodiment of this invention, respectively. (A), (b) is a figure for demonstrating the 3rd frame format which concerns on 2nd Embodiment of this invention, respectively. (A), (b) is a figure for demonstrating the 4th frame format which concerns on 2nd Embodiment of this invention, respectively. It is a sequence example for demonstrating the residual packet transfer method by the encapsulation which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the method to provide header information to transfer data using the correspondence table which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the method to terminate the header provided in the handover origin node which concerns on 2nd Embodiment of this invention in a handover destination node. It is a figure which shows the example of a sequence for demonstrating the residual packet transfer method by the protocol header reattachment which concerns on 2nd Embodiment of this invention. (A), (b) is a figure for demonstrating the other packet transfer method which concerns on 2nd Embodiment of this invention, respectively. (A), (b) is a figure for demonstrating the other packet transfer method which concerns on 2nd Embodiment of this invention, respectively. (A), (b) is a figure for demonstrating the other packet transfer method which concerns on 2nd Embodiment of this invention, respectively. It is a sequence example for demonstrating the pattern D which concerns on 2nd Embodiment of this invention. It is a sequence example for demonstrating the arbitration method using the header re-assignment and resource allocation request | requirement which concerns on 2nd Embodiment of this invention. 1 is a schematic configuration diagram of a W-CDMA system. (A) is a figure which shows the state before a hand-over, (b) is a figure which shows the state after a hand-over. It is a figure for demonstrating DSCH.

Claims (6)

In a mobile communication system for transferring residual packet data in a first base station to a second base station according to a handover process executed in accordance with movement of the mobile station,
A controller that executes the transfer without performing an encapsulation process for adding a retransmission control header for the residual packet data;
The mobile communication system, wherein the mobile station includes a receiving unit that receives the transferred residual packet data.   The mobile communication system according to claim 1, wherein the header includes a sequence number. In a transfer method in a mobile communication system for transferring residual packet data in a first base station to a second base station in accordance with a handover process executed in accordance with movement of the mobile station,
The transfer is performed without performing an encapsulation process for adding a retransmission control header for the residual packet data,
The transfer method in a mobile communication system, wherein the mobile station receives transferred residual packet data.   4. The transfer method in the mobile communication system according to claim 3, wherein the header includes a sequence number. In a base station that can be a base station before a handover in a mobile communication system that transfers residual packet data in a base station that is a handover source to a base station that is a handover destination according to a handover process that is performed according to the movement of the mobile station,
A control unit that performs the transfer without performing an encapsulation process that adds a retransmission control header to the residual packet data;
A base station comprising: The base station according to claim 5, wherein the header includes a sequence number .

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