Pilot transmission method for down collaboration multi-point transmission

Abstract

The invention discloses a pilot frequency transmission method for downlink shared multicast transmission, which is used in a long term evolution advance (LTE-A) system. The system is allocated with a plurality of sets of pilot frequencies for downlink multicast transmission and multiplexing modes thereof; and each transmission point involved in downlink share transmits one of the pilot frequencies in a resource block carrying user data, the same set of pilot frequency occupies the same time and frequency sites in the resource block, and the different sets of pilot frequencies are discriminated via frequency division, time division or code division in the resource block. The inventive method needs not a receiving terminal to discriminate channels corresponding to the transmission points which are involved in the share and only needs to allocate one set or a plurality of sets of logic pilot frequencies for multicast transmission, thereby resulting in low cost of pilot frequencies, simple terminal reception and less downlink control signaling.

Description

technical field [0001] The present invention relates to a broadband wireless communication system, in particular to a pilot frequency transmission method used for coordinated multi-point transmission in a 3GPP LTE-A system (a follow-up evolution system of LongTerm Evolution Advance technology). Background technique [0002] With the introduction of LTE-A requirements, people pay more and more attention to the average spectral efficiency of the cell and the spectral efficiency of the cell edge. In comparison, the spectral efficiency of the cell edge has attracted the most attention, mainly because the upper and lower levels of the LTE-A system All of them are frequency division systems that use 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 complet...

AI Technical Summary

Problems solved by technology

[0004] In modern wireless communication systems, it is generally necessary to use pilots to coherently demodulate data. Currently, the pilots defined in the LTE system are generally cell-based (except for the pilot corresponding to antenna port 4 in LTE, which corresponds to for MBSFN data transmission), so these pilots are generally not suitable for coordinated multi-point transmission scenarios

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