Method and system for channel information feedback in comp mode

A channel information feedback and information feedback technology, which is applied in the transmission system, digital transmission system, radio transmission system, etc., can solve the problems of being unable to dynamically support single-cell CSI and adapting to dynamic switching of different transmission technologies.

Active Publication Date: 2016-02-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there is still a problem in CoMP transmission: in the same node, when there are users served by multi-nodes cooperatively, there will be target users of coordinated services and target users of non-coordinated services in the same cell
[0006] At present, there is no relatively complete technology to support channel information feedback in CoMP mode, so it cannot dynamically support single-cell CSI (channel state information, channel state information) information feedback and multi-cell CSI information feedback, and cannot adapt to the communication between different transmission technologies. Dynamic switching of

Method used

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  • Method and system for channel information feedback in comp mode
  • Method and system for channel information feedback in comp mode
  • Method and system for channel information feedback in comp mode

Examples

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Comparison scheme
Effect test

Embodiment 1

[0086] Example 1: Periodic feedback extension

[0087] During periodical feedback, for the channel information of other coordinated cells, when the channel information of other cells is fed back on the PUCCH, configuration may be performed in the following manner.

[0088] 1. Using broadband CQI and PMI feedback, such as figure 1 shown;

[0089] In way 1), by configuring Mri, where Mri is a parameter indicating the configuration of the RI transmission cycle, the CQI / PMI of the primary serving cell and the coordinated cell are fed back between two RI feedbacks. Wherein, when the PCI needs to be fed back, the PCI can be fed back on an independent feedback period between the main serving cell feeding back the CQI / PMI and the coordinated cell feeding back the CQI / PMI (such as figure 1 in the way 1). In this extended mode, the Mri value configured by the high layer needs to be greater than or equal to the period required for the broadband CQI / PMI and PCI feedback of the main ser...

Embodiment 2

[0102] Embodiment 2: PUSCH feedback extension

[0103] In LTE 8, the feedback of CSI information on PUSCH only exists in two cases. One case is that there is uplink shared data during periodic feedback. At this time, CSI information is transmitted on PUSCH, and the format is the same as the feedback format on PUCCH. . Another case is aperiodic feedback. When aperiodic feedback is configured in the PDCCH, the CSI information is fed back in accordance with the aperiodic feedback mode configured by the high layer. Normally, acyclic feedback is only performed in the following two cases:

[0104] When the DCIformat of downlink transmission is 0, and the CQI request in DCIformat0 is set to 1;

[0105] When the CQI request of the corresponding grant is set to 1 for random access.

[0106] When considering the extension of CoMP, mainly consider the case where the CQI request in the downlink DCI format0 is set to 1. In practical applications, two methods of PUSCH feedback can be co...

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Abstract

Disclosed are a method and system for channel information feedback under CoMP, where the terminal can perform channel information feedback on main serving cells and coordinate cells outside of the main serving cells according to their respective feedback mode and / or different granularities under Coordinated Multipoint transmission / reception. The main serving cells refer to cells that send physical downlink control information for the user. The coordinate cells refer to a single or multiple cells that require measurements and feedback of channel status information. This invention achieves the technology of channel information feedback under CoMP, supporting the channel information feedback under CoMP; and dynamically supporting single cell CSI information feedback and multiple cell CSI information feedback, thus adapting to the dynamic switching between different transmission technologies.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a system for channel information feedback in a CoMP (coordinated multi-point transmission) mode. Background technique [0002] With the introduction of LTE-A requirements, people pay more and more attention to the average spectrum efficiency of the cell and the spectrum efficiency of the cell edge. In comparison, the spectral efficiency at the edge of the cell is the most concerned, mainly because the uplink and downlink of the LTE-A system are all frequency division systems with OFDM (or some variation of OFDM) as the basic multiple access multiplexing method. . Different from the traditional wireless communication system with CDMA as the basic multiple access multiplexing method, the LTE-A system has no processing gain. Because the frequency division is completely orthogonal inside the cell, there is almost no interference problem, but the interference processing at the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/00
CPCH04L1/0026H04B7/024H04B7/0417H04B7/0626
Inventor 孙云锋郭森宝陈艺戬张晨晨张峻峰
Owner ZTE CORP
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