Abstract
The present invention relates to a method for configuring a retransmission protocol on the uplink between a network node and a relay node in a mobile communication system the configuration being performed at a network node or at a relay node and to the corresponding relay node apparatus and network node apparatus capable of configuring the retransmission protocol. In particular the number of transmission processes is determined based on the position of time intervals available for the transmission and may be selected in order to control the round trip time of the retransmission protocol. Once the number of transmission processes has been configured the transmission processes are mapped on the available time intervals in a predefined order and repetitively.
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4G,3G | 05/08/2013 | ISLD-201309-038 | PANASONIC CORP | No | Family Member | ||||
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Technologies
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Claim
1. A retransmission method comprising:
receiving, from a relay node, a frame including a plurality of subframes on which a plurality of HARQ processes are mapped, a HARQ process of the plurality of HARQ processes being a processing unit of Hybrid Automatic Repeat Request (HARQ), and the received frame being configured at the relay node by specifying, in a frame for communication, a plurality of subframes available for uplink data transmission from the relay node to a network node, selecting a number of HARQ processes based on the specified plurality of subframes for uplink transmission, and mapping the selected number of HARQ processes sequentially onto the specified plurality of subframes, wherein the number of HARQ processes is determined based on a parameter which is transmitted from the network node in a backhaul subframe configuration; and
retransmitting data to the relay node according to the HARQ.
2. The retransmission method according to claim 1, wherein the selection of the number of HARQ processes is performed such that a smallest number is selected from among numbers of HARQ processes where a roundtrip time is larger than a minimum system round trip time, the roundtrip time being a transmission time interval of a same HARQ process.
3. retransmission method according to claim 1, wherein a backhaul uplink subframe corresponding to a backhaul downlink subframe is allocated to a position which is four subframes after the backhaul downlink subframe.
4. The retransmission method according to claim 1, wherein the HARQ is an uplink repeat request from the relay node to the network node.
5. A retransmission apparatus comprising:
receiving section configured to receive, from a relay node, a frame including a plurality of subframes on which a plurality of HARQ processes are mapped, a HARQ process of the plurality of HARQ processes being a processing unit of Hybrid Automatic Repeat Request (HARQ), and the received frame being configured at the relay node by specifying, in a frame for communication, a plurality of subframes available for uplink data transmission from the relay node to a network node, selecting a number of HARQ processes based on the specified plurality of subframes for uplink transmission, and mapping the selected number of HARQ processes sequentially onto the specified plurality of subframes, wherein the number of HARQ processes is determined based on a parameter which is transmitted from the network node in a backhaul subframe configuration; and
transmitting section configured to retransmit data to the relay node according to the HARQ.
6. The retransmission apparatus according to claim 5, wherein the selection of the number of HARQ processes is performed such that a smallest number is selected from among numbers of HARQ processes where a roundtrip time is larger than a minimum system round trip time, the roundtrip time being a transmission time interval of a same HARQ process.
7. The retransmission apparatus according to claim 5, wherein a backhaul uplink subframe corresponding to a backhaul downlink subframe is allocated to a position which is four subframes after the backhaul downlink subframe.
8. The retransmission apparatus according to claim 5, wherein the HARQ is an uplink repeat request from the relay node to the network node.
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