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Trigger method for non-periodic channel state information feedback

A channel state information, non-periodic technology, applied in the direction of transmission path sub-channel allocation, wireless communication, signaling allocation, etc., can solve the problems that cannot be well applied, achieve simple and effective design, low complexity, and meet design requirements Effect

Active Publication Date: 2012-07-18
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that in the coordinated multipoint transmission mode, in addition to aperiodically performing channel state information measurement and feedback on multiple component carrier frequencies of the serving cell, it is also necessary to target multiple adjacent cooperative Multiple component carrier frequencies of the cell are used for channel state information measurement and feedback. In this case, the two-bit trigger mechanism defined in the LTE-Advanced system cannot be well applied

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  • Trigger method for non-periodic channel state information feedback

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Embodiment 1

[0037] According to Embodiment 1 of the present invention, the working mode of the user equipment is configured as a coordinated multi-point transmission mode through high-level signaling (such as RRC signaling), and then, through the two-bit aperiodic channel state information request field in the downlink control information format, Dynamically trigger the aperiodic channel state information feedback of the user equipment.

[0038] Specifically, referring to LTE-Advanced's definition of the two-bit aperiodic channel state information request field contained in the downlink control information format, states "10" and "11" are configured for the designated CoMP transmission mode.

[0039] In Embodiment 1 of the present invention, the meanings of state "00" and state "01" can refer to the aforementioned definition of LTE-Advanced, which are respectively configured as: not triggering aperiodic channel state information feedback; and in all measurement cells, and The uplink compo...

Embodiment 2

[0046] According to the second embodiment of the present invention, an extra bit is introduced, plus the already defined two-bit channel state information request field, to fully and dynamically trigger aperiodic channel state information feedback under multi-component carrier frequencies of multi-cooperative cells. In the LTE-Advanced system, two bits are used to indicate the aperiodic channel information state feedback mode in four states. An additional bit is introduced, and a 3-bit field is used to trigger the aperiodic channel information status feedback, which can realize up to 8 different triggering modes.

[0047] Specifically, the field states "000", "001", "010" and "011" respectively correspond to the states "00", "01", "10" and "11" defined in the LTE-Advanced system. The four field states "100", "101", "110" and "111" added due to an additional bit can be used to trigger aperiodic channel information feedback in the CoMP transmission mode. For the newly introduce...

Embodiment 3

[0056] According to the third embodiment of the present invention, the hybrid coding method is used to redefine the existing three-bit carrier frequency indication field and the already defined two-bit channel state information request field in the downlink control information format, and fully and dynamically trigger multi-partitioning of multi-cooperative cells. Feedback of aperiodic channel state information under high carrier frequency.

[0057] In the LTE-Advanced system, a three-bit carrier frequency indication field has been introduced into the downlink control information format for scheduling across component carrier frequencies. The 3-bit carrier frequency indication field and the channel state information request field contain 5 bits of information in total, which can represent 32 states. According to the definition of LTE-Advanced, the system supports a maximum of 5 carrier frequencies to work at the same time. Therefore, each carrier frequency can obtain 6 states,...

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Abstract

The invention provides a trigger method for non-periodic channel state information feedback, which is used in a multi-collaboration-cell multi-component-carrier system. Firstly, a base station semi-statically configures user equipment through a high-level signal, i.e. a radio resource control (RRC) signal to a collaboration multi-point transmission mode and / or measuring cell information and / or measuring component carrier information; then the base station utilizes downlink control information to dynamically initiate a non-periodic channel state information feedback request to the user equipment through a physical downlink control channel (PDCCH); after the user equipment receives the non-periodic channel state information feedback request transmitted by the base station, the user equipment transmits measured non-periodic channel state information to the base station through a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH). By adopting the technical scheme, the method for non-periodic channel state information feedback in the collaboration multi-point transmission mode can be flexibly configured and triggered and very good forward compatibility can be obtained at the same time. The trigger method for non-periodic channel state information feedback has the advantages that the design is simple and effective, the system design complexity is reduced and the design demands of actual systems and long term evolution advanced (LTE-Advanced) systems are met.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, and more specifically, relates to a method for triggering aperiodic channel state information (CSI, Channel State Information) feedback, which is used in a communication system using spectrum aggregation technology and coordinated multipoint transmission mode. Background technique [0002] In April 2008, the Third Generation Partnership Project (3GPP) organized a seminar on the next-generation international mobile communication system IMT-Advanced in Shenzhen, China. In this symposium, major companies analyzed the requirements of 4G mobile communication systems and discussed the key technologies that may be adopted. Among the many technical proposals, a technology called "coordinated multi-point transmission" has received extensive attention and support. Its core idea is to use multiple base stations to provide communication services for one or more user equipment at the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04W28/16
CPCH04L5/00H04L5/0085H04L5/001H04L5/0057H04L5/0094H04W24/10H04L1/0027
Inventor 黄磊丁铭杨曾刘仁茂
Owner SHARP KK
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