Method and device for transmitting DCI (downlink control information)

A configuration information and network-side technology, applied in the communication field, can solve problems such as failure to correctly receive legacyPDCCH, failure to access the system, etc., and achieve the effect of reducing signaling overhead and system operating costs

Active Publication Date: 2012-07-11
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0018] In this scenario, consider reducing the MTC operating bandwidth from the perspective of terminal cost reduction, and at the same time hope that MTC devices can access the current LTE system, but if the system bandwidth is greater than the bandwidth supported by MTC devices, since the Legacy PDCCH is interleaved at the full bandwidth , so in this case the MTC device cannot correctly receive the legacy PDCCH
The legacy PDCCH includes a public search space and a user-specific search space. If the MTC device cannot receive the legacy PDCCH correctly, it is equivalent to being unable to access the entire system under the premise of reducing costs (reducing the MTC working bandwidth mentioned above).
[0019] Obviously, there is no technical solution for transmitting public control information on E-PDCCH in the existing disclosed technologies

Method used

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  • Method and device for transmitting DCI (downlink control information)
  • Method and device for transmitting DCI (downlink control information)
  • Method and device for transmitting DCI (downlink control information)

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Embodiment Construction

[0046] In order to realize the transmission of public control information based on the E-PDCCH, in the embodiment of the present invention, in the E-PDCCH resources in the PDSCH area (ie, the data area), determine the two types of E-PDCCH candidates configured on the network side, and use the One type of E-PDCCH candidate transmits UE-specific DCI to the UE, and another type of E-PDCCH candidate transmits at least common DCI to the UE.

[0047] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] refer to Image 6 As shown, in the embodiment of the present invention, the detailed process of the network side transmitting DCI to the UE based on the E-PDCCH is as follows:

[0049] Step 600: the base station determines two types of E-PDCCH candidates configured on the network side in the E-PDCCH resources in the PDSCH area.

[0050] For example, the base station only uses UE-specific RNTI to scra...

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Abstract

The invention relates to the communication field and discloses a method and a device for transmitting DCI (downlink control information). The method comprises the following steps of: dividing E-PDCCH (extended physical downlink control channel) resources in a PDSCH (physical downlink shared channel) region into two types of candidate E-PDCCH, transmitting the terminal-exclusive DCI to a terminal by adopting the first type of the candidate E-PDCCH and at least transmitting the public DCI to the terminal by adopting the second type of the candidate E-PDCCH. Therefore, the signaling overhead when the public DCI is transmitted can be effectively reduced; and simultaneously, MTC (machine type communications) equipment can also be supported for running under working bandwidth which is lower than the bandwidth of a system, and the running cost of the system can be effectively reduced.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for transmitting DCI. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, PDCCH (Physical Downlink Control Channel, physical downlink control channel) is sent in each radio subframe, and is shared with PDSCH (Physical Downlink Shared Channel, physical downlink shared channel) The transmitted downlink data forms a TDM (Time Division Multiplex and Multiplexer, Time Division Multiplexing) multiplexing relationship. PDCCH is transmitted through the first N OFDM (Orthogonal Frequency Division Multiplexing) symbols of a downlink subframe, where N may be 1, 2, 3, 4, and N=4 is only allowed to appear in In a system with a system bandwidth of 1.4MHz. Specific as figure 1 shown. [0003] Under the existing technology, the control region for transmitting PDCCH in the LTE system is composed of logically divided CCEs (Control Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12
Inventor 赵锐潘学明沈祖康肖国军
Owner DATANG MOBILE COMM EQUIP CO LTD
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