WO2010100828A1 - 無線通信システムにおける通信装置およびリソース再割当方法 - Google Patents
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- 238000004891 communication Methods 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 66
- 238000004590 computer program Methods 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
- 230000002085 persistent effect Effects 0.000 description 6
- 238000012937 correction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004904 shortening Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
- H04L5/0085—Timing of allocation when channel conditions change
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Definitions
- the present invention relates to a radio communication system, and more particularly to a resource reallocation method and a communication apparatus using the same.
- the system band allocated to the base station is divided into small frequency bands called resource blocks, and resource blocks are scheduled. It is a unit of allocation.
- Dynamic scheduling DS (Dynamic Scheduling) is adopted as scheduling for applications where the data generation cycle is not constant, such as Web page browsing and file transfer.
- radio resources resource block, transmission cycle, transmission power, etc.
- radio resource used for each transmission can be changed according to the channel quality on the receiving side, but which radio resource is used for each transmission. It is necessary to notify whether or not using a control channel different from the data channel.
- Reservation-type scheduling is a scheduling method that reserves radio resources for initial transmission packets for subsequent packets by utilizing the fact that the data generation period such as VoIP is constant.
- Persistent scheduling PS reserves radio resources for the initial transmission packet, so that notification using the control channel is not necessary. Therefore, radio resources allocated to the control channel can be reduced, and frequency use efficiency can be improved.
- the transmission side reserves resources, it allocates by referring to the average channel quality of the system band, determines the coding rate of the frequency band and error correction code, and starts from the resource blocks that are not yet reserved. It is generally considered to be assigned to
- the initial transmission packet is transmitted at a constant period in accordance with the data generation period, and therefore, the temporal variation for each resource block used for transmission is sufficiently considered. Absent. It is assumed that the average channel quality of the system band will be reported because the channel quality in the downlink is reported to the terminal as an average value for each resource block, and the uplink resources are used extra. Yes.
- the frequency of retransmission increases and the delay time increases.
- the time until the completion of reception for each packet changes. As a result, the time until the packet is normally received varies on the receiving side even though the transmitting side transmits the packet at a constant period.
- Patent Document 1 is a method in which the combination of the data modulation scheme and channel coding indicated by MCS is temporarily changed according to the number of retransmissions, and the time change until packet reception is completed on the receiving side. Cannot be suppressed sufficiently.
- an object of the present invention is to provide a resource reallocation method and a communication apparatus using the same that can suppress fluctuations in reception delay time in reservation type scheduling.
- a resource reassignment method in a radio communication system that reserves radio resources and periodically communicates with other communication devices, and measures the number of retransmissions of packets transmitted to the communication devices using reserved radio resources.
- the radio resource used for the transmission is reassigned according to the number of retransmissions.
- a communication apparatus is a communication apparatus in a radio communication system that reserves radio resources and periodically communicates with other communication apparatuses, and transmits to the other communication apparatuses using the reserved radio resources.
- a retransmission number measuring unit that measures the number of retransmissions of the received packet, and a resource reallocation unit that performs reallocation of a radio resource used for the transmission according to the number of retransmissions.
- a radio communication system is a radio communication system having at least one base station and at least one mobile terminal that perform radio communication by reserving radio resources, wherein the base station uses a reserved radio station.
- Retransmission count measuring means for measuring the number of retransmissions of a packet transmitted to each mobile terminal using resources, and resource reassignment means for executing reallocation of radio resources used for the transmission according to the retransmission count It is characterized by that.
- a computer program according to the present invention is a computer program for causing a program control processor to function as a communication device in a wireless communication system that reserves wireless resources and periodically communicates with other communication devices. Realizing the program control processor with a function of measuring the number of retransmissions of a packet transmitted to a communication device using a resource and a function of executing reallocation of radio resources used for the transmission according to the number of retransmissions It is characterized by.
- a wireless communication unit 101 is a block in which a transmission unit, a reception unit, a channel control unit, and the like of a general wireless communication system are combined, and is a hybrid ARQ (Automatic Repeat reQuest). It has a resending function such as.
- the reservation type scheduler 102 has a function of allocating radio resources to reservation type traffic packets.
- the retransmission number management unit 103 manages the number of retransmissions for each packet transmitted by the wireless communication unit 101.
- the resource reallocation unit 104 reallocates reserved resource blocks according to the number of retransmissions.
- the resource management unit 105 has a function of managing the reservation status of resource blocks, which are radio band allocation units.
- the control unit 106 controls the operation of the entire communication apparatus. Here, resource reallocation control will be described.
- the control unit 106 causes the reservation type scheduler 102 to reserve a resource block (step S201). Specifically, the reservation type scheduler 102 confirms the resource reservation status of the resource management unit 105, reserves a resource block of a certain period, updates the reservation status of the resource management unit 105, and controls the allocation result of the resource block Notification to the unit 106. Since the resource block reservation method for the first packet is well known, the details of the reservation operation are omitted.
- the control unit 106 determines whether there is a packet to be transmitted (step S202). If there is a packet to be transmitted (step S202: YES), the wireless communication is performed using the resource block reserved by the reservation type scheduler 102. The transmission packet is transmitted by the unit 101. At that time, the retransmission number management unit 103 counts the number of retransmissions when the transmission packet is retransmitted according to the control of the control unit 106 (step S203). That is, the retransmission number management unit 103 manages the number of retransmissions of a packet transmitted for each reserved resource block.
- the control unit 106 and the resource reallocation unit 104 execute resource block reallocation control according to the number of retransmissions. Specifically, it is determined whether or not the number of retransmissions is equal to or greater than a predetermined threshold (step S204). If the number of retransmissions is smaller than the predetermined threshold (step S204: YES), resource block reassignment is not performed. Then, the process returns to step S202 for checking whether there is a packet to be transmitted next. If the number of retransmissions is equal to or greater than the predetermined threshold (step S204: NO), the resource reallocation unit 104 reallocates resource blocks used in the communication, that is, changes the frequency band and / or changes the transmission timing. (Step S205).
- the resource reallocation unit 104 determines the resource block to be used as another available resource block (unreserved or exchangeable resource block, as described later).
- the reservation status of the resource management unit 105 is updated. If there is a packet to be transmitted next under the control of the control unit 106 (step S202: YES), the wireless communication unit 101 performs packet transmission of the communication using the reassigned resource block (step S202). S203). The above processes S202 to S205 are repeated as long as there is transmission data in the reserved resource block.
- control unit 106 updates the reservation status of the resource management unit 105 so as to release the reserved resource block (step S206).
- the resource reallocation function by the reservation type scheduler 102, the retransmission count management unit 103, the resource reallocation unit 104, the resource management unit 105, and the control unit 106 as described above executes a computer program on a program control processor such as a CPU. It can also be realized in the same way.
- the number of retransmissions is measured for each resource block reserved and allocated, and resource block reallocation is executed according to the number of retransmissions.
- resource block reallocation is executed according to the number of retransmissions.
- the resource block to be used is changed to another available resource block (resource reassignment).
- Second Embodiment In the mobile communication system shown in FIG. 3, in order not to complicate the description, a plurality of mobile terminals 20.1 to 20.4 are located in the cell of the base station 10, and the base station 10 It is assumed that the network device 30 is connected. Hereinafter, the configuration of the base station 10 will be described with reference to FIGS. 4 and 5.
- the base station 10 in addition to the wireless communication unit 301 that performs wireless communication with the mobile terminal, the base station 10 includes a reservation type scheduler 302, a retransmission count management unit 303, a resource reallocation unit 304, a resource management unit 305, A control unit 306, and further, a reception processing unit 307 for processing an uplink signal received from each mobile terminal, and transmitting transfer data of the uplink signal to a higher-level network device (base station control device), A communication unit 308 that receives data from the host network device is included.
- each function of the reservation type scheduler 302, the retransmission count management unit 303, the resource reallocation unit 304, the resource management unit 305, the control unit 306, and the reception processing unit 307 corresponds to a computer program corresponding to each on a program control processor such as a CPU. It can also be realized by executing. Further, here, the parts related to the resource reallocation control according to the present invention are mainly shown, and the other components are omitted. Hereinafter, a downlink will be described as an example of the wireless communication system.
- the horizontal axis represents the time direction indicated by the frame number, and the number of frames 20 is the packet transmission cycle.
- the vertical axis represents the frequency indicated by the resource block number.
- the system band allocated to the base station 10 is divided into small frequency bands called resource blocks, and the resource blocks are scheduling allocation units.
- the resource management unit 305 manages the reservation status of resource blocks as shown in FIG. Note that the resource block is logical and may be different from the frequency used for transmission. This is because the logical resource block to be managed and the physical resource block used for transmission need only correspond one to one.
- FIG. 5 illustrates a case where the number of resource blocks is 10 and the number of transmission frames is 20 in each transmission frame, but the present invention is not limited to this.
- the reservation type scheduler 302 determines whether there is an unallocated resource block with reference to the resource reservation status shown in FIG. 5 when a packet that has not been reserved arrives. Make a reservation according to the number of resource blocks that are not reserved. Once a reservation is made, a packet for the same communication that arrives after that can be transmitted using the reserved resource block and the transmission frame.
- First Embodiment Resource reallocation reallocates an unreserved resource in the same frame as the current resource for communication in which the number of retransmissions reaches a predetermined number.
- the communication has a high possibility of shortening the reception delay without changing the transmission timing.
- the resource block number 1-2 is reserved for the communication A
- the resource block number 3 is the resource block number 4-5 for the communication B.
- resource block number 6-10 is not reserved.
- the number shown in each resource block indicates the number of packet retransmissions in the resource block, and the predetermined threshold for the number of retransmissions is 2.
- the control unit 306 since the number of retransmissions is 2 or more of the predetermined threshold value in the resource block number 4-5 currently used by the communication C, the control unit 306 notifies the resource reallocation unit 304 of the communication The reassignment of the resource block used in C is instructed.
- the resource reallocation unit 304 determines whether there is an unreserved resource block that can be allocated to the communication C within the same frame while referring to the resource reservation status managed by the resource management unit 305. If there are as many unreserved resource blocks as the resource blocks currently used by communication C, these unreserved resource blocks are newly allocated to communication C. In the example shown in FIG. 6, the unreserved resource block number 6-7 is newly assigned to the communication C and notified to the resource management unit 305. As a result, the resource management unit 305 updates the resource block number 6-7 to be reserved by communication C, and releases the previous resource block number 4-5 to be unreserved. Note that although the communication C uses two resource blocks here, this is an example, and the same applies even if the number of resource blocks is one or three or more.
- Second Embodiment In the resource reallocation according to the second embodiment of the present invention, if there are a plurality of communications in which the number of retransmissions reaches a predetermined number and the amount of resources currently used is the same, they are exchanged To reallocate resources. By exchanging resources with other communications in this way, resources can be reassigned even when there are no unreserved resource blocks. Furthermore, if resources are exchanged within the same frame, these communications have a high possibility of shortening the reception delay without changing the transmission timing.
- the resource block number 1-2 is reserved for the communication A
- the resource block number 3 is the resource block number 4-5 for the communication B.
- resource block numbers 9-10 are reserved for communication D
- resource block numbers 6-8 are not reserved.
- the number shown in each resource block indicates the number of packet retransmissions in the resource block, and the predetermined threshold value for the number of retransmissions is 2.
- control unit 306 has the resource block number 4-5 currently used by the communication C, the number of retransmissions is two or more of a predetermined threshold, and the resource block number 9- 10, the number of retransmissions is equal to or more than a predetermined threshold value, so the resource reallocation unit 304 is instructed to reallocate resource blocks used in communication C and communication D.
- the resource reallocation unit 304 refers to the resource reservation status managed by the resource management unit 305, and the communication C and communication D pointed out as the reallocation targets belong to the same frame number k, and the same resource If it is found that the number of blocks is used, a resource block number 4-5 of communication C is newly assigned to communication D, a resource block number 9-10 of communication D is newly assigned to communication C, The resource management unit 305 is notified. As a result, the resource management unit 305 updates the resource block number 9-10 to be reserved by communication C and the resource block number 4-5 to be reserved by communication D.
- an unreserved resource in a frame different from the current resource is allocated to a communication whose number of retransmissions reaches a predetermined number.
- Another transmission frame indicates a transmission frame after the current transmission frame. That is, in this embodiment, the transmission timing is delayed until a transmission frame after the current transmission frame.
- resource block number 1-5 is reserved, of which resource block number 4-5 is reserved for communication C, and resource block number 6- Assume that 10 is unreserved. Further, in another transmission frame (frame number j), it is assumed that resource block number 1-5 has been reserved and resource block number 6-10 has not been reserved.
- the number shown in each resource block indicates the number of packet retransmissions in the resource block, and the predetermined threshold value for the number of retransmissions is 2.
- the control unit 306 since the number of retransmissions is 2 or more of the predetermined threshold value in the resource block number 4-5 currently used by the communication C, the control unit 306 notifies the resource reallocation unit 304 of the communication The reassignment of the resource block used in C is instructed.
- the resource reallocation unit 304 refers to the resource reservation status managed by the resource management unit 305, and determines whether there is an unreserved resource block that can be allocated to the communication C in another frame located behind in time. judge. If there are the same number of unreserved resource blocks as the resource blocks currently used by communication C in transmission frame j, these unreserved resource blocks are newly allocated to communication C. In the example shown in FIG. 8, the unreserved resource block number 6-7 of the transmission frame j is newly allocated to the communication C and notified to the resource management unit 305.
- the resource management unit 305 updates the resource block number 6-7 of the transmission frame j to be reserved by the communication C, and releases the resource block number 4-5 of the original transmission frame k to be unreserved.
- the communication C uses two resource blocks here, this is an example, and the same applies even if the number of resource blocks is one or three or more.
- Fourth Embodiment Resource reallocation performs reallocation of unreserved resources that are larger than the resource amount at the time of reservation for communication in which the number of retransmissions reaches a predetermined number.
- the resource amount after the reallocation may be changed by changing the modulation scheme and the coding rate of the error correction code, and the amount of information to be transmitted can be made the same as that before the reallocation. For example, when the modulation scheme is not changed, if the coding rate of the error correction code is halved, it can be reassigned to twice the resource amount without changing the transmission information amount. In this way, when a larger resource amount is allocated, there is an effect that reception errors in communication with poor communication quality can be greatly improved.
- resource block number 1-5 has been reserved, of which resource block number 4-5 is reserved for communication C, and resource block number 6- Assume that 10 is unreserved.
- the number shown in each resource block indicates the number of packet retransmissions in the resource block, and the predetermined threshold value for the number of retransmissions is 2.
- the control unit 306 since the number of retransmissions is 2 or more of the predetermined threshold value in the resource block number 4-5 currently used by the communication C, the control unit 306 notifies the resource reallocation unit 304 of the communication The reassignment of the resource block used in C is instructed.
- the resource reallocation unit 304 determines whether there is an unreserved resource block that can be allocated to the communication C within the same frame while referring to the resource reservation status managed by the resource management unit 305. If there are more unreserved resource blocks than the resource block currently used by communication C, these unreserved resource blocks are newly allocated to communication C. In the example shown in FIG. 9, the unreserved resource block number 6-9 is newly assigned to the communication C and notified to the resource management unit 305. As a result, the resource management unit 305 updates the resource block number 6-9 to be reserved by communication C, and releases the previous resource block number 4-5 to be unreserved.
- the number of resource blocks after reassignment can be kept the same as that before reassignment by changing the modulation scheme and the coding rate of the error correction code. For example, when the modulation scheme is not changed, if the coding rate of the error correction code is halved, as shown in FIG. 9, two resource blocks can be reassigned to four resource blocks. .
- reassignment is performed in the same transmission frame in FIG. 9, reassignment may be performed in the same manner in another transmission frame as in the third embodiment described above. Since the number of resource blocks used for transmission increases, reception errors in communications with poor communication quality can be greatly improved.
- the present invention is not only applied to the LTE system, but can also be applied to a radio communication system using a frequency division multiplexing (FDMA).
- FDMA frequency division multiplexing
- the present invention can be applied to a wireless communication system, for example, a wireless communication system using LTE or FDMA.
Abstract
Description
1.1)構成
図1において、無線通信部101は、一般的な無線通信システムの送信部、受信部およびチャネル制御部などをまとめたブロックであり、ハイブリッドARQ(Automatic Repeat reQuest)などの再送機能などを有するものとする。
図2に示すように、制御部106はVoIPのような定期的に発生するパケットが到着すると、予約型スケジューラ102によりリソースブロックの予約を実行させる(ステップS201)。具体的には、予約型スケジューラ102は、リソース管理部105のリソース予約状況を確認して一定周期のリソースブロックを予約し、リソース管理部105の予約状況を更新し、リソースブロックの割当結果を制御部106へ通知する。なお、最初のパケットのリソースブロック予約方法は周知であるから予約動作の詳細については省略する。
上述したように、本実施形態によれば、予約して割り当てたリソースブロック毎に再送回数を測定し、その再送回数に応じてリソースブロックの再割当を実行する。好ましくは、再送が頻繁に発生する場合(再送回数が所定回数以上になった場合)に、使用するリソースブロックを他の利用可能なリソースブロックへ変更する(リソース再割当)。このリソース再割当動作により、予約型スケジューリング方式におけるパケットの遅延時間の短縮および変動の抑制が可能となり、さらに再送回数が少なくなることで予約できる無線リソースが増え、無線リソースの利用効率が向上するという効果もある。
図3に示す移動通信システムでは、説明を複雑にしないために、基地局10のセル内に複数の移動端末20.1~20.4が位置しており、基地局10は上位のネットワーク装置30に接続されているものとする。以下、基地局10の構成について図4および図5を参照しながら説明する。
本発明の第1実施例によるリソース再割当は、再送回数が所定回数に達した通信に対して、現在のリソースと同一フレーム内の未予約リソースを再割り当てする。このように同一フレーム内の未予約リソースを新たに割り当てられることで、当該通信は送信タイミングを変更することなく受信遅延の短縮の可能性が高くなる。
本発明の第2実施例によるリソース再割当は、再送回数が所定回数に達した複数の通信があり、それぞれの現在使用しているリソース量が同一であれば、それらを交換することでリソースの再割当を実行する。このように他の通信との間でリソース交換することで、未予約リソースブロックがない場合でも、リソースの再割当が可能となる。さらに、同一フレーム内でリソース交換をすれば、これら通信は送信タイミングを変更することなく受信遅延の短縮の可能性が高くなる。
本発明の第3実施例によるリソース再割当は、再送回数が所定回数に達した通信に対して、現在のリソースとは別のフレーム内の未予約リソースを割り当てる。なお、別の送信フレームとは、現在の送信フレームよりも後の送信フレームを指す。つまり、本実施例においては、現在の送信フレームより後の送信フレームまで送信タイミングを遅延させることになる。
本発明の第4実施例によるリソース再割当は、再送回数が所定回数に達した通信に対して、予約時のリソース量より多い未予約リソースの再割り当てを行なう。再割り当て後のリソース量は、変調方式や誤り訂正符号の符号化率を変更すればよく、再割り当て前と送信する情報量を同じにすることができる。例えば、変調方式を変えない場合は、誤り訂正符号の符号化率を半分にすれば、送信情報量を変えずに2倍のリソース量に再割り当てすることができる。このようにより大きいリソース量に割り当てされる場合には、通信品質が悪い通信における受信誤りを大幅に改善できる効果がある。
上述した実施例では再割り当てを行なう場合、リソースブロック番号が小さいものから適用しているが、これに限定されるものではなく、任意のリソースブロック番号に対して適用できる。また、上述した第2実施形態および各実施例では、下りリンクを例にとって説明したが、上りリンクにおいても適用できる。
20 移動端末
30 上位ネットワーク装置
101 無線通信部
102 予約型スケジューラ
103 再送回数管理部
104 リソース再割当部
105 リソース管理部
106 制御部
301 無線通信部
302 予約型スケジューラ
303 再送回数管理部
304 リソース再割当部
305 リソース管理部
306 制御部
307 受信処理部
308 通信部
Claims (25)
- 無線リソースを予約して周期的に通信装置間の通信を行なう無線通信システムにおけるリソース再割当方法であって、
予約された無線リソースを用いて通信装置へ送信したパケットの再送回数を測定し、
前記再送回数に応じて当該通信に使用する無線リソースの再割当を実行する、
ことを特徴とするリソース再割当方法。 - 前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを送信タイミングおよび/または周波数が異なる別の無線リソースに再割り当てすることを特徴とする請求項1に記載のリソース再割当方法。
- 前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを同一送信タイミングの別の無線リソースに再割り当てすることを特徴とする請求項2に記載のリソース再割当方法。
- 前記同一送信タイミングの別の無線リソースは、未予約の無線リソースであることを特徴とする請求項3に記載のリソース再割当方法。
- 前記同一送信タイミングの別の無線リソースは、別の通信により予約されている無線リソースであり、当該別の通信も再送回数が前記所定回数以上である場合には、当該通信と当該別の通信との間でそれぞれの無線リソースを交換することを特徴とする請求項3に記載のリソース再割当方法。
- 前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを別の送信タイミングの無線リソースに再割り当てすることを特徴とする請求項2に記載のリソース再割当方法。
- 前記別の送信タイミングの無線リソースは、未予約の無線リソースであることを特徴とする請求項6に記載のリソース再割当方法。
- 前記別の送信タイミングの無線リソースは、別の通信により予約されている無線リソースであり、当該別の通信も再送回数が前記所定回数以上である場合には、当該通信と当該別の通信との間でそれぞれの無線リソースを交換することを特徴とする請求項6に記載のリソース再割当方法。
- 前記通信に使用する無線リソースと前記別の無線リソースとは、同一のリソース量であることを特徴とする請求項1-8のいずれか1項に記載のリソース再割当方法。
- 前記通信に使用する無線リソースと前記別の無線リソースとは、異なるリソース量であることを特徴とする請求項1-8のいずれか1項に記載のリソース再割当方法。
- 無線リソースを予約して周期的に他の通信装置との通信を行なう無線通信システムにおける通信装置であって、
予約された無線リソースを用いて前記他の通信装置へ送信したパケットの再送回数を測定する再送回数測定手段と、
前記再送回数に応じて当該通信に使用する無線リソースの再割当を実行するリソース再割当手段と、
を有することを特徴とする通信装置。 - 前記リソース再割当手段は、前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを送信タイミングおよび/または周波数が異なる別の無線リソースに再割り当てすることを特徴とする請求項11に記載の通信装置。
- 前記リソース再割当手段は、前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを同一送信タイミングの別の無線リソースに再割り当てすることを特徴とする請求項12に記載の通信装置。
- 前記同一送信タイミングの別の無線リソースは、未予約の無線リソースであることを特徴とする請求項13に記載の通信装置。
- 前記同一送信タイミングの別の無線リソースは、別の通信により予約されている無線リソースであり、当該別の通信も再送回数が前記所定回数以上である場合には、当該通信と当該別の通信との間でそれぞれの無線リソースを交換することを特徴とする請求項13に記載の通信装置。
- 前記リソース再割当手段は、前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを別の送信タイミングの無線リソースに再割り当てすることを特徴とする請求項12に記載の通信装置。
- 前記別の送信タイミングの無線リソースは、未予約の無線リソースであることを特徴とする請求項16に記載の通信装置。
- 前記別の送信タイミングの無線リソースは、別の通信により予約されている無線リソースであり、当該別の通信も再送回数が前記所定回数以上である場合には、当該通信と当該別の通信との間でそれぞれの無線リソースを交換することを特徴とする請求項16に記載の通信装置。
- 前記通信に使用する無線リソースと前記別の無線リソースとは、同一のリソース量であることを特徴とする請求項11-18のいずれか1項に記載の通信装置。
- 前記通信に使用する無線リソースと前記別の無線リソースとは、異なるリソース量であることを特徴とする請求項11-18のいずれか1項に記載の通信装置。
- 請求項11-20のいずれか1項に記載の通信装置を備えた、前記無線通信システムの基地局。
- 無線リソースを予約して周期的に通信を行なう少なくとも1つの基地局と少なくとも1つの移動端末とを有する無線通信システムであって、
前記基地局は、
予約された無線リソースを用いて各移動端末へ送信したパケットの再送回数を測定する再送回数測定手段と、
前記再送回数に応じて当該通信に使用する無線リソースの再割当を実行するリソース再割当手段と、
を有することを特徴とする無線通信システム。 - 前記リソース再割当手段は、前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを送信タイミングおよび/または周波数が異なる別の無線リソースに再割り当てすることを特徴とする請求項22に記載の無線通信システム。
- 無線リソースを予約して周期的に他の通信装置との通信を行なう無線通信システムにおける通信装置としてプログラム制御プロセッサを機能させるためのコンピュータプログラムであって、
予約された無線リソースを用いて通信装置へ送信したパケットの再送回数を測定する機能と、
前記再送回数に応じて当該通信に使用する無線リソースの再割当を実行する機能と、
を前記プログラム制御プロセッサに実現することを特徴とするコンピュータプログラム。 - 前記再送回数が所定回数以上になると、当該通信に使用する無線リソースを送信タイミングおよび/または周波数が異なる別の無線リソースに再割り当てすることを特徴とする請求項24に記載のコンピュータプログラム。
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