Dispatching method for reducing interference of PDCCH of a plurality of small areas of LTE system and device
A scheduling method and a technology of a scheduling device, which are applied in the field of mobile communication LTE, can solve problems such as not being able to fully guarantee the correct demodulation of a user's PDCCH, and achieve the effects of improving transmission reliability, reducing interference, and ensuring performance
Inactive Publication Date: 2010-09-22
THE RES INST OF TELECOMM TRANSMISSION MIIT
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However, in areas with relatively large co-channel interference, the transmission of 8 CCEs cannot fully guarantee the correct demodulation of the user's PDCCH
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[0022] According to the LTE protocol, the PDCCH is located in the first 3 symbols of the downlink subframe. A scheduling method for reducing the PDCCH interference of multiple cells in the LTE system proposed by the present invention, such as figure 1 shown, including:
[0023] Step 1: In a predetermined downlink subframe, divide the time-frequency resources used for PDCCH transmission into N time-frequency resource sets on average, that is, each time-frequency resource set contains the same number of control channel elements, where N is a positive integer greater than or equal to 1;
[0024] Step 2: Assign respective time-frequency resource sets to the multiple cells, wherein the multiple cells have different identification numbers that are consecutive positive integers, specifically:
[0025] Assuming that the identification number of any of the cells is M, let:
[0026] t=M mod N, where mod is a modulo operation, and it is stipulated that the PDCCHs of all users in the c...
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The invention relates to a dispatching method for reducing the interference of PDCCH of a plurality of small areas of an LTE system and a device. The method comprises the following steps of: 1: averagely dividing a time-frequency resource for transmitting the PDCCH into N time-frequency resource sets in preset downward subframes; and 2. distributing respective time-frequency resource set to the plurality of small areas, wherein the plurality of small areas have identification numbers which are respectively different and are continuous positive integers, the identification number in any one of the small area is supposed to be M, t=Mmod N, the mod is mould taking computation, and the PDCCH of all users of the small area is transmitted with the time-frequency resource in a t time-frequency resource set. By distributing the transmission of the PDCCH in some downward subframs of each small area into the different time-frequency resources, the invention obviously reduces the PDCCH of an edge user due to interference, guarantees the performance of the edge user, and further improves the reliability of the transmission of the PDCCH of the user in a region with serious same-frequency interference.
Description
technical field [0001] The invention relates to the field of mobile communication LTE, in particular to a scheduling method and device for reducing PDCCH interference of multiple cells in an LTE system. Background technique [0002] For the LTE (Long Term Evolution, long-term evolution) (EUTRA (Evolved UMTS Terrestrial Radio Access)) system, the PDCCH (Physical Down control channel, physical downlink control channel) of each cell uses the same time-frequency resource for data transmission. Users at the edge of the cell will experience relatively large co-channel interference on the PDCCH. In order to enable the downlink to smoothly carry out co-frequency networking and ensure system spectrum utilization, the standard stipulates four CCE (Control Channel Element, control channel unit) sizes for PDCCH transmission, that is, use 8, 4, 2, and 1 CCE respectively For transmission, a maximum of 8 CCEs can be used for transmission of one PDCCH. However, in areas where co-channel i...
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IPC IPC(8): H04W16/12
Inventor 刘晓峰沈嘉
Owner THE RES INST OF TELECOMM TRANSMISSION MIIT