Implicit information channel feedback method in coordinated multi-point transmission scene
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A technology of channel feedback and multi-point transmission, applied in the field of implicit feedback, which can solve the problem of not being able to obtain CQI information.
Active Publication Date: 2010-04-07
SHANGHAI RES CENT FOR WIRELESS TECH
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Embodiment 1
[0016] The example is figure 1 As shown, it is assumed to be a joint processing mode in a 3-cell CoMP scenario, where cell s0 refers to the serving cell, and cell i (i=1, 2) refers to the cooperating cell respectively, assuming that Hi (i=s0, 1, 2) is the UE and The channel matrix of cell i, then the signal received by UE is
[0017] y = H S 0 w S 0 s + H 1 w 1 s + H 2 w 2 s + n - - - ( 1 )
[0018] where w i (i=s 0 , 1, 2) is the precoding matrix applied to cell i to transmit to UE, s is the transmission information, and n is the sum of Gaus...
Embodiment 2
[0043] Assume that the measurement set is the joint processing mode in the CoMP scenario of M cells, where cell 1 refers to the serving cell of the UE, and cell i (i=2, 3, ..., M) respectively refer to the cooperating cells in the measurement set, assuming that Hi (i= 1, 2, ..., M) is the channel matrix of UE and cell i, then the signal received by UE is
[0044] y=H 1 w 1 s+H 2 w 2 s+…+H M w M s+n (1)
[0045] where w i (i=1, 2, ..., M) is the precoding matrix applied to cell i to transmit to the UE, s is the transmission information, and n is the sum of Gaussian white noise and interference outside the measurement set at the receiving end.
[0046] Since different TPCC values are configured according to the base station, the CQI feedback value is also different, and there may be 2 M - 1 TPCC value. We propose the following two schemes respectively.
[0047] plan 1:
[0048] On the UE side, the UE only feeds back the CQI value of a single transmission point for CoM...
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Abstract
The invention provides an implicit information channel feedback method in coordinated multi-point transmission scene. In a downlink coordinated multi-point (CoMP) transmission scene, aiming at the implicit information channel feedback mechanism, the value of the channel quality indicator (CQI) or the value of the signal to noise ratio (SNR) in each district in a measurement set is fed back to a base station according to the configuration in a district in the measurement set. By adopting the technical scheme of the invention, the CQI value under the different transmission point configuration TPCC in the CoMP scene is provided for the base station fully and flexibly on the basis of ensuring small feedback quantity.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a method for implicit feedback in a coordinated multi-point scenario. Background technique [0002] At present, the standardization work on IMT Advanced is highly concerned at home and abroad. "Enhancing the peak rate to enhance advanced services and applications" is an important feature of IMT-Advanced. The "downlink target peak rate is 1Gbps, and the uplink target peak rate is 500Mbps" of the 3GPP LTE Advanced system. In order to achieve the above indicators, the LTE workshop in April 2008 focused on discussing possible new technology groups that meet the requirements of the IMT Advanced (including LTE Advanced) system. The outstanding advantages in terms of system capacity are highlighted. [0003] Coordinated multi-point transmission technology (CoMP), based on the idea of using each base station and each antenna to send useful signals as much as possible, realizes ...
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