User scheduling method in mobile communication system

Abstract

The invention provides a user scheduling method in a mobile communication system, which comprises the following steps of: dividing a codebook vector into more than one orthogonal vector group; presetting a distance threshold value, and storing a codebook vector set A<g> with a distance to a codebook vector C<g> not greater than the threshold value; calculating a CQI (Channel Quality Indicator) value and a PVI (Positive Volume Index) value and feeding the CQI value and the PVI value back to a network side by users; distributing users feeding back the PVI value corresponding to the codebook vector C<g> into user groups I(i, g) by the network side; for any user k in a user set U(i, g) jointly formed by the user groups I(j, l) corresponding to each codebook vector C<g> in the set A<g>, determining a downlink channel for the user k according to the CQI value and the PVI value fed back by the user k, and determining e_SINR<k><(i, g)> of the user k mapped to C<l><g> according to the downlink channel of the user k, selecting the maximum e_SINR<k><(i, g)> from e_SINR<k><(i, g)> corresponding to users from U(i, g) and storing the maximum e_SINR<k><(i, g)>; and calculating the sum of maximum e_SINR<k><(i, g)> values in each vector group, selecting the vector group with the maximum sum from all vector groups, and performing user scheduling from all users corresponding to the vector group. By using the user scheduling method provided by the invention, the probability of user scheduling failure when the user quantity is small can be reduced.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a user scheduling method in a mobile communication system. Background technique [0002] In multiple-input multiple-output (MIMO) mobile communication systems such as LTE systems, a typical method for user scheduling is the PU2RC method. In the PU2RC method, the base station does not estimate the channel, but schedules users according to the feedback information from the user end, that is, selects users to communicate with the base station. For details on the PU2RC method, please participate in figure 1 and figure 2 . [0003] figure 1 It is a schematic diagram of the composition of the LTE system in the case of a single cell. [0004] figure 1 , the number of antennas of the base station is M, and the number of users is K, where M and K are both natural numbers. figure 1 The working process of the system shown includes: the base station does not perform chan...

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Problems solved by technology

[0038] It can be seen from the above scheme that in the existing PU2RC method, the space for user scheduling is limited to the user grouping of each set of orthogonal codebook vectors, so when the number of users is small, due to the limitation of the accuracy of user calculation PVI, It will reduce the probability that the user is assigned to a certain codebook vector, thus increasing the probability of user pairing failure or scheduling failure

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