Method and base station for carrying out frequency hopping diversity-wave bound type transmission
A beamforming and frequency hopping technology, applied in the LTE field, can solve problems such as large performance differences, affecting system detection performance, and unreasonable distribution of reference symbols, and achieve the effect of improving detection performance
Active Publication Date: 2013-05-08
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology
[0019] The above method of frequency hopping transmission in units of time slots has the following two defects: (1) For conventional CP subframes, when DwPTS is configured with 9 OFDM symbols, since there is no user-specific reference symbol in Slot 1, it cannot If user-specific reference symbols are used for channel estimation, the data in Slot 1 cannot be demodulated normally
(2) For the case where there are user-specific reference symbols in both slots, there is also the problem of unreasonable distribution of reference symbols, resulting in a large performance difference between the two slots before and after
Both of the above two defects will affect the detection performance of the system
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[0041] The embodiment of the present invention comprehensively considers issues such as implementation complexity and system performance, and proposes a new frequency hopping structure scheme, which is used to support beamforming transmission in variously configured DwPTS time slots. Its characteristics are:
[0042] (1) When performing beamforming in DwPTS, the existing user-specific reference symbol mapping structure can be used, but frequency hopping transmission with Nd=2 is performed based on a unit (Unit) of a specific length. Wherein, one PRB includes two Units, that is, Unit 0 and Unit 1 .
[0043] (2) Let L represent the number of OFDM symbols configured in one DwPTS (for regular CP subframes, L can be 3, 9, 10, 11 or 12; for extended CP subframes, L can be 3, 8, 9 or 10.)
[0044] When L=3, since there is no PDSCH transmission in the DwPTS, there is no need to support frequency hopping, so the frequency hopping scheme proposed in the embodiment of the present inven...
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The invention provides a method and a base station for carrying out frequency hopping diversity-wave bound type transmission. The method comprises the following steps: in part of the frequency sections of a system bandwidth, a user special reference mark is mapped in a unit 0 in a physical resource block (PRB), and the area except an area occupied by a physical downlink control channel (PDCCH) inthe unit 0 is set as a user resource mapping area; in the rest part of the frequency sections of the system bandwidth, the user special reference mark is mapped in a unit 1 in the PRB, and the unit 1is set as the user resource mapping area, wherein the unit 0 comprises first five orthogonal frequency division multiplexing (OFDM) marks in the PRB, the unit 1 comprises the sixth OFDM mark to the Lth OFDM mark in the PRB, and L is the amount of OFDM marks collocated for a downlink pilot time slot(DwPTS); and the mapping mode is adopted to carry out the frequency hopping diversity-wave bound typetransmission in the DwPTS. The method and the base station provided by the invention can improve the detection performance of a system.
Description
technical field [0001] The present invention relates to the technical field of LTE, in particular to a method and a base station for performing frequency hopping diversity beamforming transmission. Background technique [0002] The Long Term Evolution (LTE) system supports two duplex modes of Frequency Division Duplex (FDD) and Time Division Duplex (TDD), and the two duplex modes use different frame structures. Wherein, the second type of frame structure (FS2) is only applicable to the LTE TDD system. see figure 1 , figure 1 It is a schematic diagram of the frame structure of the second type in the system in which the uplink and downlink switching period is 5 ms in the prior art. Each radio frame consists of two 5ms long half-frames. [0003] For a system with an uplink and downlink switching period of 5ms, each half-frame includes four 1ms-long subframes (subframe) and three special slots (special slots): Downlink Pilot Time Slot (DwPTS, DownlinkPilot Time Slot), Guard...
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IPC IPC(8): H04L27/26H04B7/26
Inventor 林亚男丁昱肖国军索士强
Owner DATANG MOBILE COMM EQUIP CO LTD