JP4700540B2 - Packet scheduling method, communication apparatus, and mobile terminal - Google Patents

Description

  The present invention relates to a packet scheduling method, a communication apparatus, and a mobile terminal used in a radio communication system, and in particular, a base station, which is a communication apparatus constituting the radio communication system, moves a specific radio channel for packet transmission. The present invention relates to a packet scheduling method in the case of preferential allocation to terminals.

  In the packet scheduling method in the conventional wireless communication system, the base station actually measures the bandwidth ratio between the uplink and the downlink allocated to each mobile terminal for the purpose of smooth bidirectional communication in the upper layer. However, the uplink and downlink allocation amounts are adjusted based on the uplink and downlink allocation bandwidth ratios required by the mobile terminal. Specifically, the base station first performs uplink and downlink scheduling based on downlink reception quality at each mobile terminal, path loss on the uplink, and the like. If the bandwidth ratio between the uplink and the downlink allocated to each mobile terminal is different from the allocated bandwidth ratio between the uplink and the downlink required by each mobile terminal, the bandwidth ratio required by each mobile terminal As a result, the scheduling result has been adjusted (for example, Patent Document 1).

JP 2004-135180 A

  However, the conventional packet scheduling method has the following problems.

  When an acknowledgment type protocol such as RLC (Radio Link Control) or TCP (Transmission Control Protocol) is applied as an upper layer, for example, when a mobile terminal receives a data packet on the downlink and transmits an acknowledgment packet on the uplink If the uplink is not allocated after downlink transmission in the base station, not only is the delivery confirmed but the throughput is not lowered, but the higher layer is received although the data packet is correctly received by the mobile terminal. Data packets are retransmitted due to timeout in the wireless communication, and the usage efficiency of radio resources is significantly reduced.

  In addition, when the uplink is a multiple access scheme such as TDMA, FDMA, or OFDMA, in order to avoid interference between signals, the uplink allocation to the mobile terminal can be scheduled exclusively at the same frequency and at the same timing. desirable. The same timing corresponds to a time unit such as a slot. Even when the CDMA scheme is applied to the uplink, it is possible to suppress interference and improve quality by limiting the number of users performing simultaneous transmission and scheduling. However, in the packet scheduling method in the conventional wireless communication system, the bandwidth ratio between the uplink and the downlink is adjusted. However, when the exclusive schedule at the same frequency and the same timing is performed, the mobile terminal transmits the data packet on the downlink. After receiving the packet, the uplink cannot be quickly assigned to the timing at which the delivery confirmation packet is desired to be transmitted on the uplink. That is, when considering the bandwidth allocation amount within a certain time on the uplink when measuring the bandwidth ratio, the detailed allocation timing within that certain time cannot be considered. For this reason, a delay occurs in the transmission confirmation transmission of the upper layer, and it is difficult to maximize the throughput.

  The present invention has been made in view of the above, and after a mobile terminal receives a data packet of an upper layer in the downlink, the transmission confirmation information of the data packet is transmitted with low delay to improve the uplink throughput. It is an object of the present invention to obtain a packet scheduling method for allocating an uplink.

  It is another object of the present invention to provide a packet scheduling method for allocating a downlink so that the base station can transmit the acknowledgment information of the upper layer in the downlink with a low delay and improve the downlink throughput.

  It is another object of the present invention to obtain a communication device and a mobile terminal that implement the packet scheduling method.

  In order to solve the above-described problem and achieve the object, the present invention provides a communication device that constitutes a packet communication system using a wireless line, after transmitting upper layer data to a mobile terminal under its own device, A packet scheduling method for preferentially assigning an uplink radio channel for delivery confirmation transmission to the mobile terminal, and generating at least one packet including upper layer data to be transmitted to the mobile terminal A priority allocation information generating step for generating priority allocation information for preferentially allocating an uplink radio channel for transmission confirmation transmission to the mobile terminal in accordance with generation of a packet including the last information bit; A packet with priority allocation information for transmitting the packet including the last information bit to which the priority allocation information is added to the mobile terminal. A transmission step, and a priority allocation information confirmation step for confirming whether the priority allocation information is given to the uplink allocation request when an uplink radio channel allocation request (uplink allocation request) is received from the mobile terminal; An uplink scheduling step of preferentially allocating an uplink to a mobile terminal that has transmitted the uplink allocation request when the priority allocation information is attached to the uplink allocation request. To do.

  According to the present invention, the communication apparatus can preferentially assign an uplink to a mobile terminal that is going to perform delivery confirmation of an upper layer, and can confirm delivery with low delay. It is possible to improve the effect.

  Embodiments of a packet scheduling method according to the present invention and a communication system that realizes the packet scheduling method will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration example of a first embodiment of a communication system that realizes a packet scheduling method according to the present invention. This communication network includes a mobile terminal 1 and a base station 2, a higher station 3, a network 4, and a server 5 that realize the packet scheduling method according to the present invention. The mobile terminal 1 performs packet communication with another communication device (in this example, the server 5) via the base station 2, the upper station 3, the network 4, and the like using the radio line assigned by the base station 2. Do. The base station 2 is connected to the upper station 3 and transmits / receives packets to / from the upper station. The network 4 is an IP (Internet Protocol) network or an ATM (Asynchronous Transfer Mode) network constructed according to the communication system, and transmits and receives packets to and from the upper station 3. In the configuration example illustrated in FIG. 1, only the mobile terminal 1 performs wireless communication with the base station 2, but actually, the mobile terminal 1 and other mobile terminals not illustrated are Communication with the base station 2 is performed using radio resources allocated from the base station 2.

  In FIG. 1, 101 to 104 indicate packets transmitted and received between the mobile terminal 1 and the base station 2, and 101 and 103 are transmitted from the base station 2 to the mobile terminal 1 via a downlink. It is a downstream packet. Reference numerals 102 and 104 denote uplink packets transmitted from the mobile terminal 1 to the base station 2 via the uplink. In these packets, upper layer data packets and delivery confirmation packets can be divided or combined and stored, and generated according to a packet format on a wireless line. In the following description, a packet transmitted / received on a wireless line between a base station and a mobile station is referred to as a “wireless transmission packet”.

  The packet 101 is a wireless transmission packet (data packet) including data addressed to the mobile terminal 1. The packet 102 is a radio transmission packet (message) including an uplink allocation request that is control information, and the allocation of radio resources (uplink) used when the mobile terminal 1 transmits the radio transmission packet is assigned to the base station. 2 for requesting. Further, the packet 102 includes information such as the amount of information of a packet waiting for transmission in the mobile terminal 1 and the amount of power that can be used. The packet 103 is a wireless transmission packet (message) including uplink allocation permission that is control information, and is used for notifying the uplink allocated by the base station 2 to the mobile terminal 1. The channel used for transmission / reception of a wireless transmission packet including control information for uplink allocation request (packet 102) and uplink allocation permission (packet 103) may be an individual channel, a shared channel, a random access channel, or the like. There is no particular limitation here. The packet 104 is an acknowledgment (ACK: ACKnowledgement). A packet transmission / reception operation performed between the base station 2 and the mobile terminal 1 will be described later.

  FIG. 2 is a diagram illustrating a configuration example of the mobile terminal 1. The mobile terminal 1 includes an uplink transmission buffer 11, an encoding / modulation function unit 12, a demodulation / decoding function unit 13, a radio transmission / reception unit 14, and an antenna 15. , A downlink quality measurement unit 16, a priority information management unit 17, an uplink transmission timing management unit 18, and a packet assembly unit 19.

  In the mobile terminal 1, the uplink transmission buffer 11 temporarily stores the TCP / IP packet received from the upper layer until it is transmitted to the base station (base station 2 in the case of the configuration shown in FIG. 1). . The encoding / modulation function unit 12 encodes and modulates the packet received from the uplink transmission timing management unit 18. The demodulation / decoding function unit 13 demodulates and decodes a signal received from the base station via the wireless transmission / reception unit 14. The radio transmission / reception unit 14 transmits / receives a signal to / from the base station via the antenna 15. The downlink quality measuring unit 16 measures the quality of the received signal (downlink). The measurement result is fed back to the transmission source (base station) of the received signal. When priority allocation information is added to the radio transmission packet received from the base station, the priority information management unit 17 acquires and manages the information. Note that priority allocation information refers to a base station that preferentially schedules uplinks (to be preferentially allocated) in order to transmit acknowledgment information at the time of receiving a TCP / IP data packet with low delay. This information is used when requesting. The uplink transmission timing management unit 18 stores the transmission timing of the uplink signal (radio transmission packet) instructed from the base station, and “uplink allocation for requesting uplink allocation to the base station” A packet including control information such as “request” and a packet including uplink data are generated. Further, the uplink transmission timing management unit 18 outputs the generated wireless transmission packet to the encoding / modulation function unit 12 so as to be transmitted at the transmission timing of the uplink signal previously instructed from the base station. The packet assembling unit 19 receives a wireless transmission packet from the demodulation / decoding function unit 13 and assembles a TCP / IP packet using the packet.

  FIG. 3 is a diagram illustrating a configuration example of the base station 2 that operates as a communication apparatus according to the present invention. The base station 2 includes a wired transmission / reception unit 21, a distribution function unit 22, a packet holding unit 23, an encoding / modulation unit. A function unit 24, a demodulation / decoding function unit 25, a wireless transmission / reception unit 26, an antenna 27, a downlink quality management unit 28, a priority information management unit 29, a downlink schedule unit 30, an uplink schedule unit 31, and a packet assembly unit 32 are provided.

  In the base station 2, the wired transmission / reception unit 21 transmits / receives TCP packets to / from the upper station 3. The distribution function unit 22 classifies the TCP / IP packets received from the upper station 3 according to the mobile terminal (the destination of the TCP / IP packet) and the communication quality (for example, QoS: Quality of Service, Priority), and classifies the packet holding unit. 23. The packet holding unit 23 includes a plurality of queues (queues 23-1 to 23-m) for storing the TCP / IP packets classified by the distribution function unit 22, and transmits the TCP / IP packets to the mobile terminal. Functions as a transmission buffer. The encoding / modulation function unit 24 encodes and modulates the signal (wireless transmission packet) received from the downlink scheduling unit 30. The demodulation / decoding function unit 25 demodulates and decodes a signal received from the mobile terminal (the mobile terminal 1 and a mobile terminal under its control (not shown)) via the wireless transmission / reception unit 26. The wireless transmission / reception unit 26 transmits / receives a signal (wireless transmission packet) to / from the mobile terminal 1 via the antenna 27.

  The downlink quality management unit 28 holds downlink quality information reported from mobile terminals under its control. The priority information management unit 29 notifies the partner terminal of the end of transmission of the TCP / IP data packet, and the priority allocation information used for preferentially allocating the uplink for transmission confirmation information transmission to the terminal. Generate and manage the generated information. The downlink scheduling unit 30 assigns downlinks to mobile terminals based on the downlink quality managed by the downlink quality management unit 28, QoS, fairness between mobile terminals, packet retention in the packet holding unit 23, and the like. Determine the coding rate and modulation scheme of the packet. Also, the downlink scheduling unit 30 extracts a TCP / IP packet to be transmitted to the mobile terminal from the packet holding unit 23 based on the downlink allocation result, and generates a radio transmission packet. The uplink scheduling unit 31 performs scheduling of uplink allocation and adjustment of the schedule result (adjustment of downlink allocation result), and transmits a radio transmission packet including uplink allocation permission for notifying the mobile terminal of the adjusted schedule. Generate. The packet assembling unit 32 receives the wireless transmission packet from the demodulation / decoding function unit 25 via the uplink scheduling unit 30 and assembles a TCP / IP packet using it.

  Next, the transmission / reception operation of the radio transmission packet performed between the base station and the mobile terminal will be described. Specifically, an operation in which the base station 2 transmits data (TCP / IP packet) received from the server 5 via the upper station 3 to the mobile terminal 1 that is the destination will be described with reference to FIGS. . FIG. 4 is a sequence diagram illustrating an example of an operation in which the base station 2 transmits data (TCP / IP packet) received from the upper station 3 to the mobile terminal 1. Here, the description will be made on the assumption that the mobile terminal 1 and the server 5 communicate with each other using TCP / IP as a delivery confirmation type upper layer protocol. However, the delivery confirmation type upper layer protocol is not limited to TCP / IP. Further, the priority information management unit 29 and the downlink scheduling unit 30 of the present embodiment constitute the priority allocation information generation / transmission means of claim 13, and the priority information management unit 29 and the uplink scheduling unit 31 of the uplink scheduling means of claim 13. Configure.

  When the wired transmission / reception unit 21 of the base station 2 receives the data (TCP / IP packet) addressed to the mobile terminal 1 from the upper station 3, the received data is stored in any queue of the packet holding unit 23 by the distribution function unit 22. And waits for transmission to the mobile terminal 1. As a result of the downlink scheduling performed by the downlink scheduling unit 30, when the downlink is allocated to the mobile terminal 1, the downlink scheduling unit 30 matches the amount of information that can be transmitted extracted from the packet holding unit 23. A wireless transmission packet is generated from a TCP / IP packet. Note that only a part of the TCP / IP packet may be extracted. The above processing corresponds to the processing in step S1 in FIG.

  Further, the downlink scheduling unit 30 confirms whether or not the generated wireless transmission packet includes the last information bit of the TCP / IP data packet (step S2). When the last information bit is included in the packet (step S2, Yes), the downlink scheduling unit 30 adds priority allocation information to the generated wireless transmission packet (step S3).

  Here, the process of step S3 will be specifically described. When it is determined that the last information bit is included in the TCP / IP packet, the downlink scheduling unit 30 instructs the priority information management unit 29 to generate uplink priority allocation information. And the priority information management part 29 produces | generates the priority allocation information used by the control (scheduling) which enables the mobile terminal 1 to transmit the delivery confirmation information with respect to the said TCP / IP data packet rapidly, and manages the produced | generated information . Note that the priority allocation information is managed by, for example, generating a management table in association with the priority allocation information, the mobile terminal, and the QoS as in the example shown in FIG.

  This association may be managed only by the correspondence between the mobile terminal and the priority assignment information when TCP / IP communication is not applied to a plurality of QoS. Further, the priority allocation information is managed using, for example, a queue structure so that a plurality of priority allocation information can be held for each mobile terminal and QoS. Moreover, management of priority allocation information may be simplified so as to keep the latest one for each mobile terminal and QoS. Note that the priority information management unit 29 generates priority allocation information with a different value each time so that a plurality of wireless transmission packets to which priority allocation information is added can be transmitted and received at the same time. For this reason, the priority information management unit 29 may generate priority allocation information based on, for example, mobile terminal identification information, QoS information, and transmission time. However, a completely random value is generated as priority allocation information. May be.

  Then, the downlink schedule unit 30 regenerates the wireless transmission packet to which the priority allocation information is added. The configuration of the wireless transmission packet to which the priority assignment information is added includes the priority assignment information as a part of the header information as in the example shown in FIG. The wireless transmission packet (corresponding to the packet 101 in FIG. 1) is transmitted to the downlink wireless line (mobile terminal 1) via the encoding / modulation function unit 24, the wireless transmission / reception unit 26, and the antenna 27 (step S4). ).

  When the downlink scheduling unit 30 passes a wireless transmission packet to the encoding / modulation function unit 24, the encoding rate and modulation scheme are specified in association with downlink resources such as frequency and spreading code. Also, prior to transmitting the wireless transmission packet to the wireless line, control information indicating the coding rate and modulation scheme of the wireless transmission packet, the destination mobile terminal, and the like is transmitted to the mobile terminal. If it is determined in step S2 that the wireless transmission packet does not include the last information bit of the TCP / IP data packet, the wireless transmission packet generated in step S1 is used as it is (including priority allocation information). It transmits to the mobile terminal 1 in the state (step S2, No, step S4). Note that the base station 2 executes wireless transmission packet transmission to the mobile terminal 1 a plurality of times according to the size of the TCP / IP data packet to be transmitted to the mobile terminal 1.

  When the radio transmission packet transmitted from the base station 2 is received, the demodulation / decoding function unit 13 of the mobile terminal 1 is based on the coding rate and modulation scheme previously indicated from the base station 2 in the control information. Demodulate and decode the received wireless transmission packet. Thereafter, the assembling unit 19 assembles a TCP / IP packet using the wireless transmission packet decoded by the demodulation / decoding function unit 13. When priority allocation information is added to the header of the decoded wireless transmission packet, the priority information management unit 17 manages the priority allocation information. Note that, as with the above-described priority information management unit 29 of the base station 2, the priority information management unit 17 associates QoS with a plurality of priority allocation information when TCP / IP communication is used with a plurality of QoSs. to manage. However, when the base station side is configured to manage only one priority allocation information for each mobile terminal and QoS, the priority information management unit 17 manages only one latest value. The packet assembly unit 19 passes the assembled TCP / IP packet to the upper layer (step S5). Here, description of retransmission control operations in lower layers such as hybrid ARQ (Automatic Repeat Request) is omitted.

  When the received TCP / IP packet is a data packet, the TCP / IP packet including the TCP delivery confirmation information for transmitting the delivery confirmation (ACK) is passed from the upper layer (stored in the transmission buffer 11). Here, as a method of transmitting a radio transmission packet on the uplink, there are transmission by uplink random access, transmission by acquiring the uplink allocation permission by the base station, and transmission performed at the timing according to it, but here from the base station A case will be described where transmission is performed at a timing according to uplink allocation permission (uplink allocation schedule).

  When the uplink allocation permission is not obtained, the uplink transmission timing management unit 19 sets the oldest one among the priority allocation information held and managed by the priority information management unit 18 when transmitting the radio transmission packet. The wireless transmission packet (corresponding to the packet 102 in FIG. 1) including the extracted priority allocation information and the uplink allocation request is generated. The generated wireless transmission packet is transmitted to the base station 2 via the encoding / modulation function unit 12, the wireless transmission / reception unit 14, and the antenna 15 (step S6). Thereafter, the mobile terminal 1 waits for a radio transmission packet including uplink allocation permission from the base station 2 to be transmitted (uplink is allocated). In addition, when it is necessary to transmit a wireless transmission packet including uplink allocation permission a plurality of times in order to transmit a TCP / IP packet including the delivery confirmation information, the uplink transmission timing management unit 19 Include priority allocation information for transmission packets.

  When the uplink scheduling unit 31 of the base station 2 receives a radio transmission packet including an uplink allocation request via the radio transmission / reception unit 26 and the demodulation / decoding function unit 25, the radio transmission packet includes priority allocation information. Check whether it is. When the priority allocation information is included, the uplink scheduling unit 31 determines whether the priority allocation information is generated at the time of transmission of the wireless transmission packet (whether the priority allocation information is valid priority allocation information). 29 is inquired (step S7). If the priority allocation information is valid as a result of the inquiry to the priority information management unit 29 (step S7, Yes), the uplink scheduling unit 31 increases the uplink allocation priority of the mobile terminal 1 and sets the uplink allocation schedule. Is adjusted (steps S8 and S9). On the other hand, when the priority transmission information is not included in the wireless transmission packet, or when the priority allocation information included is not valid (No in step S7), the uplink scheduling unit 31 determines that the mobile terminal 1 The uplink allocation schedule is adjusted without increasing the uplink allocation priority of the network (step S9).

  When the schedule adjustment in step S9 is completed and the uplink allocation to the mobile terminal 1 is determined, the uplink scheduling unit 31 transmits to the mobile terminal 1 a radio transmission packet including the uplink allocation permission (to the packet 103 in FIG. 1). And the generated wireless transmission packet is transmitted via the encoding / modulation function unit 24, the wireless transmission / reception unit 26, and the antenna 27 (step S10).

  The above uplink allocation permission not only indicates uplink radio resources (frequency, transmission power, spreading code, etc.) that are allowed to be used for the mobile terminal 1 regardless of the upper layer protocol, but also the transmission timing of Associated with the timing of line assignment. Therefore, the mobile terminal 1 that has received the uplink allocation permission transmits the uplink packet at the uplink packet transmission timing determined based on the reception timing. The method for determining the transmission timing of the uplink packet is the same in the second and later embodiments described later. The uplink allocation permission may be broadcast / multicast including information addressed to a plurality of mobile terminals. In this case, each mobile terminal can recognize whether or not its own mobile terminal can transmit an uplink packet by monitoring a channel through which uplink allocation permission is transmitted. Then, the mobile terminal 1 assigned with the uplink transmits ACK to the base station 2 based on the received uplink allocation permission (step S11).

  By repeating the series of operations (steps S1 to S11) as described above, the base station 2 and the mobile terminal 1 can continuously transmit and receive TCP / IP packets. The uplink allocation request need not be transmitted every uplink packet transmission, and may be transmitted only when there is a change in the amount of packet transmission requests included in the uplink allocation request or the available transmission power. Also, after receiving the uplink allocation permission, the mobile terminal 1 does not transmit the uplink allocation request and the uplink data in separate packets, but includes the contents of the uplink allocation request in the same packet as the uplink data. You may transmit to a station.

  7 and 8 are diagrams simply showing the configuration of the present invention included in the operation of the above-described embodiment. As shown in FIG. 7, each mobile terminal transmits an uplink packet at a timing based on the reception timing of the uplink allocation permission (packet) transmitted by the base station after adjusting the schedule. As a result, it is possible to avoid contention of uplink radio resources between the mobile terminals, so that the throughput of the radio system can be maximized.

  When a spreading code is used for uplink transmission, it is possible for a plurality of mobile terminals to transmit uplink packets at the same frequency and the same timing. Even if the mobile terminal transmits uplink packets without associating, there is no competition for uplink radio resources between the mobile terminals, but simultaneous transmission is restricted and scheduled to limit interference between mobile terminals. Communication quality can be improved.

  Also, as shown in FIG. 8, when a delivery confirmation type protocol such as TCP is applied to the upper layer, the base station transmits a downlink packet including uplink priority allocation information to the mobile terminal as necessary. Then, the mobile terminal transmits an uplink allocation request including the priority allocation information to the base station. The base station then adjusts the uplink allocation schedule in consideration of the priority allocation information included in the uplink allocation request. As a result, priority control with respect to delivery confirmation of an upper layer becomes possible, and delivery confirmation can be performed with a low delay. Therefore, the throughput of a system using a delivery confirmation type protocol can be improved.

Embodiment 2. FIG.
Next, the operation of the second embodiment will be described. In Embodiment 1 described above, the operation in the case where the uplink allocation priority is controlled using the priority allocation information in the radio transmission packet including the uplink allocation request received from the mobile terminal by the base station has been described. However, in the present embodiment, the uplink allocation priority is obtained by holding the time when the base station transmitted the priority allocation information and comparing this with the uplink allocation schedule result after receiving the uplink allocation request. The operation for controlling is described.

  The configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described.

  FIG. 9 is a diagram briefly illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the second embodiment. This packet transmission / reception operation will be described with reference to FIG. 4 used in the description of the first embodiment. Each unit of the base station 2 executes the processes of steps S1 to S4 shown in FIG. 4 and transmits a wireless transmission packet (packet 101) to the mobile terminal 1. In step S4, when the base station 2 transmits a wireless transmission packet including priority allocation information, the priority information management unit 29 acquires the transmission time of the wireless transmission packet from the downlink scheduling unit 30, and prioritizes it. The transmission time of the allocation information is managed in correspondence with the priority allocation information.

  Thereafter, the mobile terminal 1 executes the same processing as in the first embodiment (corresponding to steps S5 and S6 in FIG. 4), thereby transmitting an uplink allocation request for transmission confirmation transmission (uplink with priority allocation information added). (Allocation request). Although not specified in the first embodiment, the same priority allocation information is assigned when the mobile terminal 1 cannot receive the uplink allocation permission within a certain time after transmitting the uplink allocation request. Resend uplink allocation request.

  When the uplink allocation request (packet 102) is received from the mobile terminal 1, the uplink scheduling unit 31 of the base station 2 performs the same operation as in Embodiment 1 and executes scheduling for the uplink allocation request. Further, as a result of scheduling, the uplink scheduling unit 31 schedules each uplink channel assigned to each mobile terminal (each time when the mobile terminal 1 and other mobile terminals are permitted to use the uplink), The transmission time of the priority allocation information managed by the priority information management unit 29 (each time when the wireless transmission packet including the priority allocation information is transmitted to the mobile terminal) is compared. Then, based on this comparison result (time difference between the schedule time and the transmission time), the uplink scheduling unit 31 adjusts the scheduling result again. Specifically, the uplink scheduling unit 31 determines that the uplink allocation to the mobile terminal is delayed as the comparison result (time difference) increases, and increases the uplink allocation priority to readjust the schedule. . For the time and time difference used for the schedule adjustment, for example, a system frame number or a slot number is used.

  As described above, in this embodiment, in addition to the schedule adjustment based on the priority allocation information of the first embodiment, further, the delay of the uplink allocation (schedule time) with respect to the transmission time of the priority allocation information is taken into consideration. I decided to adjust the schedule. As a result, the uplink is preferentially assigned as the delay time increases, so that the delivery confirmation in the upper layer can be performed with low delay, and the throughput of the system using the delivery confirmation type protocol can be further improved.

Embodiment 3 FIG.
Subsequently, the operation of the third embodiment will be described. In the present embodiment, an operation of controlling the uplink allocation priority without using the priority allocation information by limiting the validity period of the uplink allocation request after the base station transmits the radio transmission packet will be described. The configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described. In addition, the priority information management unit 29 of the present embodiment corresponds to the allocation request expiration date calculation unit of claim 16, and the uplink schedule unit 31 corresponds to the uplink schedule unit of claim 16.

  FIG. 10 is a diagram briefly illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the third embodiment. This packet transmission / reception operation will be described with reference to FIG. 4 used in the description of the first embodiment. Each unit of the base station 2 executes the process of step S1 shown in FIG. 4 to generate a radio transmission packet to be transmitted to the mobile terminal 1. Then, the base station 2 of the present embodiment transmits the generated wireless transmission packet as the packet 101 to the mobile terminal 1 without executing the processes of steps S2 and S3 (step S4).

  At this time, the priority information management unit 29 acquires the transmission time of the wireless transmission packet from the downlink scheduling unit 30, and further calculates the expiration date for receiving the uplink allocation request based on the acquired transmission time. And the priority information management part 29 produces | generates and manages the management table which matched the calculated expiration date with a mobile terminal and QoS like the example shown in FIG. Note that this association may be managed only by correspondence between the mobile terminal and the expiration date when TCP / IP communication is not applied to a plurality of QoS. The expiration date can be calculated using a predetermined time interval based on the type of higher layer that performs delivery confirmation, etc., but when the mobile terminal starts a logical connection to the base station The expiration date (time interval) may be negotiated.

  Thereafter, upon receiving an uplink allocation request for transmission of acknowledgment transmission from the mobile terminal 1 (priority allocation information is not added in the present embodiment), the uplink scheduling unit 31 of the base station 2 receives the uplink allocation request. The reception time is compared with the expiration date (see FIG. 11) held by the priority information management unit 29. When the base station 2 receives the uplink allocation request from the mobile terminal 1 within the expiration date, the base station 2 adjusts the schedule by increasing the uplink allocation priority. On the other hand, for the uplink allocation request received after the expiration date, it is determined that the transmission confirmation information of the TCP / IP packet is not updated, and the priority is not changed. Adjust the schedule.

  Thus, in the present embodiment, the expiration date of the uplink allocation request is determined based on the transmission time of the radio transmission packet, and the uplink allocation priority is controlled using this expiration date (the schedule is adjusted). It was decided to. This eliminates the need for passing priority allocation information between the mobile terminal and the base station, which is necessary for controlling the priority, and does not reduce downlink and uplink radio band utilization efficiency. The same effect can be obtained.

Embodiment 4 FIG.
Next, the operation of the fourth embodiment will be described. In the present embodiment, an operation for controlling the uplink allocation priority using the number of upper layer packets waiting for uplink allocation will be described. The configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described. Further, the uplink schedule unit 31 of the present embodiment corresponds to the uplink schedule means of claim 17.

  FIG. 12 is a diagram briefly illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the fourth embodiment. This packet transmission / reception operation will be described with reference to FIG. 4 used in the description of the first embodiment. Each unit of the base station 2 executes the process of step S1 shown in FIG. 4 to generate a radio transmission packet to be transmitted to the mobile terminal 1. Then, the base station 2 of the present embodiment transmits the generated wireless transmission packet (packet 101) to the mobile terminal 1 without executing the processes of steps S2 and S3 (step S4).

  The mobile terminal 1 transmits an uplink allocation request for delivery confirmation transmission by executing the same processing as in the first embodiment (corresponding to steps S5 and S6 in FIG. 4). At this time, the mobile terminal 1 transmits an uplink allocation request (packet 102) to which information on the number of upper layer packets waiting for uplink allocation is added.

  When receiving an uplink allocation request to which information on the number of upper layer packets waiting for uplink allocation has been received, the uplink scheduling unit 31 of the base station 2 refers to the packet number information, and when the number of packets is large Determines that the delivery confirmation information has been greatly updated, and adjusts the schedule by increasing the uplink allocation priority. However, even if the number of upper layer packets waiting for uplink allocation is large, if the number of packets waiting for transmission is small compared to other mobile terminals, it is determined that the update of the delivery confirmation information is small. Adjust line allocation priority. “Delivery confirmation information is updated” means, for example, that a confirmation response number in the delivery confirmation information is updated.

  As described above, in this embodiment, the mobile terminal transmits the uplink allocation request to the base station by giving the number of upper layer packets waiting for uplink allocation, and the base station The uplink allocation schedule is adjusted using the number of upper layer packets waiting for channel allocation. Thereby, the delivery confirmation delay in the delivery confirmation type protocol can be reduced, and the throughput of the system can be improved.

Embodiment 5 FIG.
Next, the operation of the fifth embodiment will be described. In the above-described fourth embodiment, the operation in the case of controlling the uplink allocation priority using the number of packets of the upper layer waiting for uplink allocation has been described. The operation of controlling the uplink allocation priority using this delivery confirmation update amount on condition that the delivery confirmation update amount included in the upper layer packet waiting for allocation can be acquired in the lower layer will be described. . Further, the uplink schedule unit 31 of the present embodiment corresponds to the uplink schedule means of claim 18.

  The configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described.

  FIG. 13 is a diagram briefly illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the fifth embodiment. This packet transmission / reception operation will be described with reference to FIG. 4 used in the description of the first embodiment. Each unit of the base station 2 executes the process of step S1 shown in FIG. 4 to generate a radio transmission packet to be transmitted to the mobile terminal 1. Then, the base station 2 of the present embodiment transmits the generated wireless transmission packet as the packet 101 to the mobile terminal 1 without executing the processes of steps S2 and S3 (step S4).

  The mobile terminal 1 transmits an uplink allocation request for delivery confirmation transmission by executing the same processing as in the first embodiment (corresponding to steps S5 and S6 in FIG. 4). At this time, the mobile terminal 1 transmits an uplink allocation request (packet 102) to which information on the delivery confirmation update amount of the upper layer packet waiting for uplink allocation is added. Here, the delivery confirmation update amount is a difference (change amount) between the delivery confirmation information included in the first packet (oldest packet) waiting for uplink allocation and the delivery confirmation information included in the last packet (latest packet). .

  When receiving the uplink allocation request to which the delivery confirmation update amount information of the upper layer packet waiting for uplink allocation is received, the uplink schedule unit 31 of the base station 2 refers to the delivery confirmation update amount information, When the update amount is large, the schedule is adjusted by increasing the uplink allocation priority.

  As described above, in the present embodiment, the mobile terminal transmits an uplink allocation request to the base station by giving information of the delivery confirmation update amount included in the upper layer packet waiting for uplink allocation. Then, the base station performs uplink allocation scheduling after adjusting the uplink allocation priority by using the delivery confirmation update amount. Thereby, the delivery confirmation delay in the system using the delivery confirmation type protocol can be reduced, and the throughput can be improved. Also, since the delivery confirmation update amount can be determined more correctly than the method using the number of packets shown in the fourth embodiment, the accuracy of uplink allocation priority control can be improved.

Embodiment 6 FIG.
Next, the operation of the sixth embodiment will be described. In the present embodiment, an operation will be described in which a base station predicts an upper layer delivery confirmation timing without receiving an uplink allocation request from a mobile terminal and allocates an uplink to a mobile station. The configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described. Further, the priority information management unit 29 of the present embodiment corresponds to the reservation timing calculation holding means of claim 20, and the uplink schedule unit 31 corresponds to the uplink schedule means of claim 20.

  FIG. 14 is a diagram briefly illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the sixth embodiment. This packet transmission / reception operation will be described with reference to FIG. 4 used in the description of the first embodiment. Each unit of the base station 2 executes the process of step S1 shown in FIG. 4 to generate a radio transmission packet to be transmitted to the mobile terminal 1.

  Next, when the last information bit of the TCP / IP data packet is included in the wireless transmission packet generated by the downlink schedule unit 30 (step S2, Yes), the mobile terminal 1 confirms delivery for this TCP / IP packet. In order to allow information to be transmitted quickly on the uplink, the priority information management unit 29 calculates the uplink allocation reservation timing and holds it.

  Here, the reservation timing is a timing at which the mobile terminal that has received the data packet is expected to transmit an uplink allocation request for transmission of acknowledgment transmission to the base station. Therefore, when receiving the uplink allocation request at this timing, the base station adjusts the schedule by increasing the uplink allocation priority of the mobile terminal that has transmitted the uplink allocation request. The calculation of the reservation timing can be determined using a predetermined time interval based on the type of the upper layer that performs delivery confirmation, etc., for example, negotiation between the mobile terminal and the base station at the time of call setup May be determined.

  When the uplink scheduling unit 31 executes scheduling for uplink allocation, the priority information management unit 29 is requested to determine whether there is a reservation timing corresponding to the scheduling, that is, the uplink allocation is requested from the mobile terminal. If there is a reservation timing corresponding to the mobile terminal, an inquiry is made. As a result of the inquiry, if a reservation timing exists, the schedule is adjusted by increasing the uplink allocation priority of the mobile terminal. Note that when there is a mobile terminal to which no uplink is allocated even though the uplink allocation priority is increased and the schedule is adjusted, the uplink schedule 31 is also used in the uplink allocation scheduling after the next time. Adjust the schedule by increasing the priority of the device.

  The “uplink resource amount permitted to be used” instructed by the uplink allocation permission (packet 103) for the mobile terminal 1 specifies at least the resource amount that can be transmitted by the upper layer delivery confirmation packet, but can be used. This is not the case when there are few uplink resources. The uplink allocation permission may be broadcast / multicast including allocation permission information for a plurality of mobile terminals. When there is a TCP / IP packet waiting for uplink allocation, the mobile terminal that has received the uplink allocation permission generates and transmits a radio transmission packet.

  As described above, in the present embodiment, the base station predicts the uplink allocation timing at which the upper layer delivery confirmation is performed at the time of transmitting the radio transmission packet. When adjusting the schedule, the base station adjusts the schedule by increasing the priority until the uplink is allocated to the mobile terminal that is the target of the uplink allocation timing. Thereby, the delivery confirmation delay in the system using the delivery confirmation type protocol can be reduced, and the throughput can be improved. Furthermore, since the mobile terminal does not need to transmit a radio transmission packet including an uplink allocation request, the utilization efficiency of the uplink radio band is improved.

Embodiment 7 FIG.
Subsequently, the operation of the seventh embodiment will be described. In this embodiment, when the base station transmits a radio transmission packet, the base station predicts the delivery confirmation timing of the upper layer, and transmits the radio transmission packet to which the information of the prediction result is added, thereby connecting the uplink to the mobile station. The assigning operation will be described. The configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described. Further, the priority information management unit 29 of the present embodiment corresponds to the reservation timing calculation holding means of claim 21, and the downlink schedule unit 30 corresponds to the line allocation means of claim 21.

  FIG. 15 is a diagram briefly illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the seventh embodiment. This packet transmission / reception operation will be described with reference to FIG. 4 used in the description of the first embodiment. Each unit of the base station 2 executes the process of step S1 shown in FIG. 4 to generate a radio transmission packet to be transmitted to the mobile terminal 1.

  Next, when the last information bit of the TCP / IP data packet is included in the wireless transmission packet generated by the downlink schedule unit 30 (step S2, Yes), the priority information management unit 29 reserves uplink allocation. The timing is calculated, and the reserved uplink allocation reservation timing is held. The reservation timing is calculated by executing the same process as in the above-described sixth embodiment. However, in this embodiment, uplink allocation request transmission for delivery confirmation transmission is not required. Originally (in the other embodiments described above), it is possible to transmit the delivery confirmation at the transmission timing of the uplink allocation request.

  Further, the priority information management unit 29 also holds the amount of uplink resource that is allowed to be used for the mobile terminal 1 when the uplink is allocated at the calculated uplink allocation reservation timing. The uplink resource amount that is permitted to be used is the minimum resource amount that can be transmitted by a higher layer delivery confirmation packet, and is calculated by the uplink schedule unit 31.

  Next, the downlink scheduling unit 30 generates a radio transmission packet to which the uplink allocation reservation timing and the uplink resource amount held by the priority information management unit 29 are added, and sends the generated packet to the mobile terminal 1. Send.

  When the uplink scheduling unit 31 performs scheduling for uplink allocation, the uplink scheduling unit 31 inquires of the priority information management unit 29 whether there is a reservation timing corresponding to the scheduling. If there is a reservation timing as a result of the inquiry, an uplink is allocated to the mobile terminal with the highest priority so that the radio transmission packet transmitted from the mobile terminal corresponding to the reservation timing can be received. Prepare for reception.

  When the mobile terminal 1 receives the radio transmission packet to which the uplink allocation timing (corresponding to the “uplink allocation reservation timing”) and the use permission resource (corresponding to the “uplink resource amount”) are added, If there is a TCP / IP packet waiting for uplink allocation at the uplink allocation timing, a radio transmission packet is generated and transmitted to the base station 2. However, the usable resource amount at the corresponding timing is the minimum resource amount that can transmit the upper layer delivery confirmation packet as described above. Therefore, the upper layer generates a delivery confirmation packet preferentially, and generates a packet including only the delivery confirmation information without superimposing the delivery confirmation information on the data packet.

  As described above, in the present embodiment, the base station predicts the uplink allocation timing at which higher layer delivery confirmation is performed when transmitting a radio transmission packet, and adds the predicted timing information and use permission resource information. Reserving uplink resources by transmitting wireless transmission packets to mobile terminals, while mobile terminals are much smaller in size than data packets by generating and transmitting delivery confirmation packets with priority. Since the uplink acknowledgment packet can be transmitted preferentially, the acknowledgment delay in the higher layer acknowledgment protocol can be reduced, and the system throughput can be improved.

  Further, in the upper layer of the mobile terminal, the effect can be drastically improved by combining control such as generating one delivery confirmation packet for a plurality of received data packets. Furthermore, since the mobile terminal does not need to make an uplink allocation request, the utilization efficiency of the uplink radio band can be improved.

Embodiment 8 FIG.
Next, the operation of the eighth embodiment will be described. In Embodiments 1 to 7 described above, the operation in the case of controlling the uplink allocation priority or timing for transmission of a delivery confirmation packet in response to reception of a downlink data packet in an upper layer has been described. A scheduling operation (downlink scheduling operation) when transmitting an upper layer packet waiting for downlink allocation will be described. In the present embodiment, an operation for controlling downlink allocation timing from the number of higher layer packets waiting for downlink allocation will be described. Further, the configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described. Further, the downlink schedule unit 30 of the present embodiment corresponds to the downlink schedule means of claim 22.

  FIG. 16 is a diagram simply illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the eighth embodiment. The mobile terminal 1 that has received the uplink allocation (packet 103) corresponding to the uplink allocation request (packet 102) from the base station 2 transmits an upper layer data packet (packet 105) to the base station 2. The base station 2 receives the delivery confirmation packet for the data packet (upper layer data packet) transmitted from the mobile terminal 1 from the server 5 via the network 4. The upper layer data packet may be transmitted in a plurality of times (a data packet corresponding to the packet 105 is transmitted a plurality of times).

When receiving the delivery confirmation packet from the server 5, the downlink scheduling unit 30 of the base station 2 counts the number of packets stored in the queues 23-1 to 23-m, and among these, the delivery confirmation of the higher layer The downlink allocation schedule is adjusted by increasing the priority of the queue having a large number of packets or the number of packets including upper layer data packets. As a result of schedule adjustment, when a downlink is assigned to packet transmission addressed to the mobile terminal 1, the downlink scheduling unit 30 generates a radio transmission packet (packet 106) from the upper layer packet and transmits it to the mobile terminal 1. To do.

  As described above, in this embodiment, the base station sets a schedule with a higher downlink allocation priority for a queue having a large number of upper layer delivery confirmation packets or a higher number of packets including upper layer data packets. It was decided to adjust. As a result, it is possible to reduce the upper layer delivery confirmation delay due to the downlink and to improve the throughput.

Embodiment 9 FIG.
Next, the operation of the ninth embodiment will be described. In this embodiment, on the condition that the delivery confirmation update amount included in the upper layer packet waiting for downlink assignment can be acquired in the lower layer, this delivery confirmation update amount is used for downlink assignment. An operation for controlling the priority will be described. The configuration of the communication system that implements the packet scheduling method of the present embodiment is the same as that of the first embodiment. In addition, the configurations of the base station and mobile terminal constituting the communication system are the same as those in the first embodiment. Therefore, in the present embodiment, only operations of parts different from the above-described first embodiment will be described. Further, the downlink schedule unit 30 of the present embodiment corresponds to the downlink schedule means of claim 23.

  FIG. 17 is a diagram briefly illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the ninth embodiment. The mobile terminal 1 that has received the uplink allocation (packet 103) corresponding to the uplink allocation request (packet 102) from the base station 2 transmits an upper layer data packet (packet 105) to the base station 2. The base station 2 receives a delivery confirmation packet for the data packet transmitted from the mobile terminal 1 from the server 5 via the network 4.

  When the delivery confirmation packet from the server 5 is received, the downlink scheduling unit 30 of the base station 2 prioritizes downlink allocation to the queue having a large amount of delivery confirmation update in the upper layer among the queues 23-1 to 23-m. To adjust the schedule for downlink allocation. Here, the delivery confirmation update amount is the difference (change amount) between the delivery confirmation information contained in the first packet (oldest packet) waiting for downlink allocation and the delivery confirmation information contained in the last packet (latest packet) in each queue. ). As a result of schedule adjustment, when a downlink is assigned to packet transmission addressed to the mobile terminal 1, the downlink scheduling unit 30 generates a radio transmission packet (packet 106) from the upper layer packet and transmits it to the mobile terminal 1. To do.

  As described above, in the present embodiment, the base station adjusts the schedule by increasing the priority of downlink allocation of a queue having a large delivery confirmation update amount of upper layer packets waiting for downlink allocation. did. As a result, it is possible to reduce the upper layer delivery confirmation delay due to the downlink and to improve the throughput. In addition, since the delivery confirmation amount can be determined more correctly than the method of adjusting the downlink allocation priority based on the number of upper layer packets waiting for downlink allocation shown in the eighth embodiment, downlink allocation priority control Accuracy can be improved.

  As described above, the packet scheduling method according to the present invention is useful for a packet communication system using a wireless communication line, and in particular, a packet communication resource (wireless communication line) allocated by a base station to a mobile terminal under its control. It is suitable as a packet scheduling method when scheduling a packet.

It is a figure which shows the structural example of Embodiment 1 of the communication system which implement | achieves the packet schedule method concerning this invention. It is a figure which shows the structural example of a mobile terminal. It is a figure which shows the structural example of a base station. It is a sequence diagram which shows an example of the operation | movement which the base station transmits the data received from the high-order station to a mobile terminal. It is a figure which shows an example of the management table of priority allocation information. It is a figure which shows the structural example of a wireless transmission packet. 1 is a diagram briefly showing the configuration of the present invention included in Embodiment 1. FIG. 1 is a diagram briefly showing the configuration of the present invention included in Embodiment 1. FIG. 6 is a diagram illustrating an example of a packet transmission / reception operation performed between a base station and a mobile terminal according to Embodiment 2. FIG. FIG. 10 is a diagram illustrating an example of a packet transmission / reception operation performed between a base station and a mobile terminal according to the third embodiment. It is a figure which shows an example of the management table of the expiration date of an uplink allocation request. FIG. 10 is a diagram illustrating an example of a packet transmission / reception operation performed between a base station and a mobile terminal according to a fourth embodiment. FIG. 10 is a diagram illustrating an example of a packet transmission / reception operation performed between a base station and a mobile terminal according to the fifth embodiment. FIG. 10 is a diagram illustrating an example of a packet transmission / reception operation performed between a base station and a mobile terminal according to a sixth embodiment. FIG. 10 is a diagram illustrating an example of a packet transmission / reception operation performed between a base station and a mobile terminal according to a seventh embodiment. FIG. 10 is a diagram illustrating an example of a packet transmission / reception operation performed between a base station and a mobile terminal according to an eighth embodiment. FIG. 38 is a diagram illustrating an example of a packet transmission / reception operation performed between the base station and the mobile terminal according to the ninth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal 2 Base station 3 Upper station 4 Network 5 Server 11 Up transmission buffer 12, 24 Encoding / modulation function part 13, 25 Demodulation / decoding function part 14, 26 Radio transmission / reception part 15, 27 Antenna 16 Downlink quality measurement Unit 17, 29 priority information management unit 18 uplink transmission timing management unit 19, 32 packet assembly unit 21 wired transmission / reception unit 22 distribution function unit 23 packet holding unit 28 downlink quality management unit 30 downlink scheduling unit 31 uplink scheduling unit 101, 102, 103, 104, 105, 106 packets

Claims (7)

After a communication device that constitutes a packet communication system using a radio channel transmits higher-layer data to a mobile terminal under its own device, an uplink radio channel for delivery confirmation transmission is given priority to the mobile terminal. A packet scheduling method for assigning,
In the case of generating at least one packet including upper layer data to be transmitted to the mobile terminal, in response to the generation of the packet including the last information bit, a transmission for confirming transmission to the mobile terminal is performed. A priority allocation information generating step for generating priority allocation information for preferentially allocating uplink radio channels;
A packet transmission step with priority allocation information for transmitting to the mobile terminal a packet including the last information bit to which the priority allocation information is added;
A priority allocation information confirmation step for confirming whether or not the priority allocation information is given to the uplink allocation request when an uplink radio channel allocation request (uplink allocation request) is received from a mobile terminal;
An uplink scheduling step for preferentially allocating an uplink to a mobile terminal that has transmitted the uplink allocation request when the priority allocation information is given to the uplink allocation request;
A packet scheduling method. In the packet transmission step with priority allocation information, the time at which the packet with the priority allocation information is transmitted is held,
In the uplink scheduling step, as a result of scheduling, the time when the mobile terminal is scheduled to use the uplink (schedule time) is compared with the transmission time (priority information transmission time) of the packet provided with the priority allocation information, The packet scheduling method according to claim 1, wherein the scheduling result is adjusted based on the comparison result.   The packet scheduling method according to claim 2, wherein as a result of comparing the schedule time with the priority information transmission time, the scheduling result is adjusted when a difference (time difference) between these times is large. In a packet communication system using a radio channel, after transmitting upper layer data to a subordinate mobile terminal, a communication device that preferentially allocates an uplink radio channel for transmission confirmation transmission to the mobile terminal,
In the case of generating at least one packet including upper layer data to be transmitted to the mobile terminal, in response to the generation of the packet including the last information bit, a transmission for confirming transmission to the mobile terminal is performed. Priority allocation information generating and transmitting means for generating priority allocation information for preferentially allocating an uplink radio channel, and transmitting the generated priority allocation information to a packet including the last information bit;
When an uplink radio channel allocation request (uplink allocation request) is received from a mobile terminal, it is confirmed whether the priority allocation information is given to the uplink allocation request, and the priority allocation information is included in the uplink allocation request. Is provided, uplink scheduling means for preferentially allocating uplink to the mobile terminal,
A communication apparatus comprising: As a result of scheduling, the uplink scheduling means compares a time when the mobile terminal is scheduled to use an uplink (schedule time) and a transmission time (priority information transmission time) of a packet to which the priority allocation information is given, and The communication apparatus according to claim 4 , wherein the scheduling result is adjusted based on the comparison result. 6. The communication apparatus according to claim 5 , wherein as a result of comparing the schedule time with the priority information transmission time, the scheduling result is adjusted when a difference (time difference) between these times is large. A packet communication system using a radio channel, wherein the mobile terminal transmits a packet to the communication device using the uplink radio channel determined by the communication device according to any one of claims 4 to 6. And
A mobile terminal which transmits a packet at a timing determined based on a reception timing of the control signal after receiving a control signal including uplink radio channel information determined by the communication apparatus.

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