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Method and system for obtaining downlink control information in MBSFN sub-frame

A technology for control information and subframes, applied in the field of LTE systems, can solve the problems of inability to obtain downlink control information, inability to demodulate PDSCH, etc.

Active Publication Date: 2011-05-25
ZTE CORP
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Problems solved by technology

When the LTE-A UE is assigned any of the downlink transmission modes 1 to 6, the public reference signal (CRS, Cell-specific reference signal) is used for PDSCH demodulation, and when the LTE-A UE is in the MBSFN subframe In the middle, since there is no CRS on the MBSFN subframe, at present, the downlink control information cannot be obtained, so the demodulation of the PDSCH cannot be performed

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  • Method and system for obtaining downlink control information in MBSFN sub-frame
  • Method and system for obtaining downlink control information in MBSFN sub-frame
  • Method and system for obtaining downlink control information in MBSFN sub-frame

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no. 2 example

[0091] In the second embodiment, in the LTE-Advance UE-specific MBSFN subframe, PDCCH detection can still be performed according to any one of modes 1 to 9, or downlink transmission modes in versions after R10. When the base station notifies the use of downlink transmission modes 1 to 6, or adopts other modes and requires CRS for demodulation (the CRS on the unicast service frequency domain resource of the MBSFN subframe is used instead of the CRS on the entire bandwidth) During the demodulation of PDSCH), at this time, the CRS position is the same as the CRS position of the subframe except MBSFN, which is equivalent to the truncation processing of the CRS of the full bandwidth, only in the physical resource block that needs CRS for demodulation ( PRB, Physical Resource Block), other locations may or may not be sent. like Figure 5As shown in the shaded part in the middle, ordinary subframes (subframes other than MBSFN subframes) adopt a full-bandwidth CRS structure, while in...

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Abstract

The present invention discloses a method and a system for obtaining downlink control information in MBSFN sub-frame, wherein the method comprises the steps that: a base station transmits downlink control information to user equipment (UE) according to a determined downlink transmission mode; the UE obtains the downlink control information according to a corresponding downlink control information format in the determined downlink transmission mode on (single-frequency network multicast / broadcast) MB SFN sub-frame. In the present invention, solving method is provided aiming at the problems that how the MB SFN sub-frame in LTE-Advance version R10 obtains the downlink control information, so as to perform PDSCH demodulation, and how the downlink transmission mode is configured. The downlink control information in the MB SFN sub-frame is obtained in the LTE-Advance system, so that the demodulation of PDSCH in special MB SFN sub-frame of LTE-A UE of LTE-Advance system is realized.

Description

technical field [0001] The present invention relates to advanced LTE (LTE-Advance) system technology, in particular to a method and system for acquiring downlink control information in MBSFN subframes. Background technique [0002] A radio frame (RF, Radio Frame) in a Long Term Evolution (LTE, Long Term Evolution) system includes frame structures in a Frequency Division Duplex (FDD, Frequency Division Duplex) mode and a Time Division Duplex (TDD, Time Division Duplex) mode. [0003] figure 1 It is a schematic diagram of the frame structure of the FDD mode, such as figure 1 As shown, a wireless frame of 10 milliseconds (ms) consists of twenty slots (slots) with a length of 0.5ms and numbers 0 to 19, and slots 2i and 2i+1 form a subframe (subframe) with a length of 1ms i. [0004] figure 2 It is a schematic diagram of the frame structure of the TDD mode, such as figure 2 As shown, a 10ms radio frame consists of two half frames with a length of 5ms. A half frame includes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12H04L1/00
CPCH04W76/002H04W72/1289H04W76/40H04W72/23
Inventor 吴欣戴博左志松
Owner ZTE CORP
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