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Data transmission method based on across carrier scheduling, user device and station

A data transmission method and cross-carrier scheduling technology, applied in the field of communication, can solve the problems of not being able to support PUSCH cross-carrier scheduling, and not being able to effectively realize cross-carrier scheduling

Active Publication Date: 2015-01-21
HUAWEI DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of cross-carrier scheduling, because UL_grant and PHICH need to be sent on Pcell, and the Pcell subframe for scheduling PUSCH obtained according to a certain timing strategy may be an uplink subframe, which cannot support the PUSCH of Scell Cross-carrier scheduling, so that cross-carrier scheduling cannot be effectively realized

Method used

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  • Data transmission method based on across carrier scheduling, user device and station
  • Data transmission method based on across carrier scheduling, user device and station
  • Data transmission method based on across carrier scheduling, user device and station

Examples

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Embodiment 1

[0024] figure 1 It is a schematic flowchart of a data transmission method based on cross-carrier scheduling according to Embodiment 1 of the present invention. figure 1 The method can be performed by a base station or a UE.

[0025] 110. Determine the first downlink subframe according to the timing relationship of the uplink hybrid automatic repeat request HARQ referring to the uplink and downlink configuration, where the first downlink subframe is used to indicate the uplink scheduling grant for sending the first uplink subframe of the adjusted cell Timing of information.

[0026] For example, for each combination of uplink and downlink configurations of the calling cell and the adjusted cell, the uplink HARQ timing of a certain uplink and downlink configuration defined in LTE Release 8 can be reused to process the PUSCH transmission of the adjusted cell. The uplink and downlink configuration used is called the reference uplink and downlink configuration. The reference upl...

Embodiment 2

[0057] figure 2 It is a schematic flowchart of a data transmission process based on cross-carrier scheduling according to Embodiment 2 of the present invention. Embodiment 2 is a refinement of one or more steps in the method of Embodiment 1.

[0058] In Embodiment 2 of the present invention, an appropriate reference uplink and downlink configuration can be selected for different combinations of uplink and downlink configurations of the calling cell and the adjusted cell according to specific needs. For example, the uplink of the adjusted cell that enables cross-carrier scheduling can be selected. The uplink and downlink configuration with the most subframes is used as a reference uplink and downlink configuration.

[0059] In this embodiment, it is considered that there must be an available PHICH channel defined in LTE Release 8 when synchronous HARQ transmission is performed on the PUSCH of the adjusted cell. Because the frame structure of LTE is based on a period of 10ms,...

Embodiment 3

[0078] image 3 It is a schematic flowchart of a data transmission process based on cross-carrier scheduling according to Embodiment 3 of the present invention. Embodiment 3 is a refinement of one or more steps in the method of Embodiment 1.

[0079] In the third embodiment, there must be an available PHICH defined in LTE Release 8 when synchronous HARQ transmission is performed on the PUSCH of the adjusted cell, so that the spanning of the uplink subframes of more adjusted cells can be supported. Carrier scheduling. For uplink and downlink configurations 0 and 6, the synchronous HARQ transmission is not a 10ms cycle, so only when all uplink subframes of configurations 0 and 6 can be scheduled across carriers can they be considered to work according to their own uplink timing, so as to ensure The cell to be adjusted at the timing of the second uplink subframe is an uplink subframe.

[0080]When the calling cell adopts one of the uplink and downlink configurations 2 to 5, th...

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Abstract

Embodiments of the present invention provide a data transmission method based on cross-carrier scheduling, a user equipment, and a base station. The method includes: determining a first downlink subframe according to a timing relationship of an uplink hybrid automatic repeat request HARQ of a reference uplink and downlink configuration, where the first downlink subframe is used to indicate timing of sending uplink scheduling grant information of a first uplink subframe of a scheduled cell; transmitting the uplink scheduling grant information in a subframe of a scheduling cell corresponding to the first downlink subframe, under a circumstance that the subframe of the scheduling cell corresponding to the first downlink subframe is a downlink subframe, where an uplink and downlink configuration of the scheduling cell and an uplink and downlink configuration of the scheduled cell are different; and receiving or sending uplink data in the first uplink subframe. In the present invention, under the circumstance that the uplink and downlink configuration of the scheduling cell and the uplink and downlink configuration of the scheduled cell are different, the cross-carrier scheduling may be implemented effectively.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and more specifically, relate to a data transmission method based on cross-carrier scheduling, user equipment, and a base station. Background technique [0002] In an LTE (Long Term Evolution, long term evolution) system, the minimum time interval for the base station to schedule the user equipment is one subframe. Data transmission in the uplink direction is based on a synchronous (Hybrid Automatic Repeat reQuest, Hybrid Automatic Repeat reQuest) HARQ strategy. Specifically, the base station sends an uplink scheduling grant (Uplink_grant, UL_grant) information in a downlink subframe to schedule a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) in a subsequent uplink subframe; the user equipment (User Equipment, UE) Send PUSCH according to UL_grant; the base station receives PUSCH, and sends the feedback information (ACK or NACK) of this PUSC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/12H04L1/18
CPCH04L1/1887H04W72/0426H04L5/001H04L5/1469H04L1/1812H04L1/1893H04L5/0055H04J3/1694H04W72/12H04L1/1854H04W72/27
Inventor 李迎阳官磊李博
Owner HUAWEI DEVICE CO LTD