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D2D pair user scheduling method based on MIMO precoding in cellular district

A cellular cell and user scheduling technology, applied in space transmit diversity, electrical components, connection management, etc., can solve the problems of reducing the flexibility of D2D pair distribution and reducing the coverage of base station signals, so as to reduce communication link interference and increase The effect of flexibility

Active Publication Date: 2015-02-11
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing related patents avoid interference based on the location of the user in the cell. The solution is that the D2D pair selects the farthest cell user to reuse its resources. The edge of the cell reduces the flexibility of D2D distribution, or requires base station power control, which reduces the coverage of base station signals

Method used

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  • D2D pair user scheduling method based on MIMO precoding in cellular district
  • D2D pair user scheduling method based on MIMO precoding in cellular district
  • D2D pair user scheduling method based on MIMO precoding in cellular district

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Embodiment

[0024] Taking a certain community as an example, the base station is equipped with 4 antennas, and the users of the community and the D2D pair users are equipped with 1 antenna. Only the slow-changing channel with a center frequency of 2G and a bandwidth of 15kHz is discussed, and the channel model from the base station to the user adopts the Rayleigh fading model. , D2D uses the Rician fading model for the user's transceiver channel, and the precoding method is zero-forcing precoding under a complete channel state. Explanation of symbols: Bold capital letters Indicates matrix, bold lowercase letters Represents a row vector whose dimension is 1×Tx, (·)’ represents matrix or vector transpose, (·) * Represents a matrix or vector conjugate transpose.

[0025] Using this method to schedule D2D users, the specific steps are as follows: figure 1 shown, including the following steps:

[0026] Step 1. Since the cell users have a higher scheduling priority, the impact of D2D on t...

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Abstract

The invention relates to a D2D pair user scheduling method based on MIMO precoding in a cellular district. The method comprises the following steps: 1), according to a precoding mode, selecting a space-division user group for downlink scheduling; 2), determining a D2D pair alternative set; 3), D2D pair emission end user emitting a test signal with D2D pair sequence number information; 4), classifying D2D pairs in the alternative set into a first type and a second type; 5), selecting an interference inhibition channel, obtaining a precoding matrix, and accordingly, performing precoding processing on the downlink channel of a base station; and 6), broadcasting the sequence number information of the D2D pairs, and determining whether the D2D pairs can be scheduled within a current scheduling period. Compared to the prior art, the method provided by the invention has the following advantages: the coverage scope of base station signals is not reduced, at the time when scheduling of D2D pairs at the edge of the district is not affected, the D2D pairs in the center of the district can also be scheduled, and the distribution flexibility of the D2D pairs in the district is improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a D2D user scheduling method capable of effectively reducing and suppressing co-frequency interference of a downlink of a base station and a D2D communication link. Background technique [0002] D2D (Device-to-Device), that is, terminal direct technology, refers to a method in which adjacent terminals can transmit data through direct links within a short distance without infrastructure equipment for forwarding. The two most intuitive features of D2D technology are direct communication and short-distance communication. Direct communication can reduce processing delay, while short-distance communication can save terminal power consumption, thereby reducing interference and improving spectrum resource utilization. In addition, the wide distribution of communication terminals and the flexibility of node mobility can extend the coverage of the network, while operating in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W76/02H04W72/12H04B7/04
CPCH04W72/1273H04W76/10H04W24/10H04W76/14H04W72/541
Inventor 刘富强庞惠方王平
Owner TONGJI UNIV
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