E-PDCCH (Extended Physical Downlink Control Channel) scrambling method and ACK/NACK (Acknowledgement Character/Negative Acknowledgement) transmission method
An E-CCE and user technology, which is applied in the field of communication systems and can solve problems such as limited interference randomization characteristics, inability to realize ACK/NACK transmission, and PUCCH resource conflict.
Active Publication Date: 2012-07-11
POTEVIO INFORMATION TECH CO LTD
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[0005] Among them, in the centralized E-PDCCH, all E-CCEs in the E-CCE set allocated to the UE for carrying downlink DCI information are continuous. For the centralized E-PDCCH, MU-MIMO can be used like PDSCH When the DCI of multiple UEs are multiplexed in the same E-PDCCH resource, if the implicit correspondence defined by R8 / 9 / 10 is continued, then the DCIs of multiple UEs multiplexing the same E-PDCCH resource DCI information occupies the same CCE, which will cause PUCCH resource conflicts of multiple UEs, that is, use the same PUCCH resource to feed back their own HARQ-ACK, so the implicit correspondence between R8 / 9 / 10 cannot be directly extended to E- In PDCCH
[0006] For distributed E-PDCCH, one E-CCE is supported to be divided into L E-CCE segments, and different E-CCE segments can be assigned to different UEs, and the frequency domain diversity gain can be obtained through distributed placement, usually for distributed E-PDCCH does not use MU-MIMO for DCI information transmission, but since the basic unit of resources allocated to UE by distributed E-PDCCH is E-CCE segment, not E-CCE, then for different UEs, it may If different E-CCE segments in the same E-CCE are allocated, if the implicit correspondence defined by R8 / 9 / 10 is used, multiple UEs allocated to different E-CCE segments in the same E-CCE will also There is a problem corresponding to the same PUCCH resource, and the transmission of ACK / NACK cannot be realized
[0007] At the same time, the current PDCCH is a cell-level scrambling method when scrambling. In the same cell ID deployment scenario such as CoMP scenario 4, its interference randomization characteristics are limited
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[0073]In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0074] figure 2 A flow chart of the E-PDCCH scrambling method provided by the present invention. Such as figure 2 As shown, the method includes:
[0075] Step 201, adding a CRC check bit sequence to downlink DCI information.
[0076] The DCI sequence of each UE in the E-PDCCH after adding CRC check bits is a 0 , a 1 ,...,a A-1 ,q 0 ,q 1 ,...,q Q-1 , where the information bit sequence is a 0 , a 1 ,...,a A-1 , the CRC check bit sequence is q 0 ,q 1 ,...,q Q-1 .
[0077] Step 202, scrambling the downlink DCI information after adding CRC check bits.
[0078] Scramble the CRC check bit sequence to obtain the sequence a 0 , a 1 ,...,a A-1 , in, i=0,1,...,Q-1,x 0 , x 1 ,...,x Q-1 Bit sequence required for CRC scrambling, q i and are the i-th ...
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The invention provides an E-PDCCH (Extended Physical Downlink Control Channel) scrambling method for performing user-level scrambling to an E-PDCCH; the invention further provides an ACK / NACK information transmission method. The ACK / NACK information transmission method comprises the following steps that: a mask code sequence information of a user is introduced when a relation of the E-PDCCH and a PUCCH (Physical Uplink Control Channel) is established for an integrated E-PDCCH; and when the relation of the E-PDCCH and the PUCCH is established for a distributive E-PDCCH, the established relation relates to a sequence number of E-CCE (Extended-Cooperative Computing Environment) segments bearing DCI (Downlink Control Information), thus the ACK / NACK information can be regularly transmitted.
Description
technical field [0001] The present invention relates to communication system technology, in particular to the scrambling method of E-PDCCH and the sending method of ACK / NACK. Background technique [0002] The enhanced PDCCH (E-PDCCH) can achieve the purpose of expanding the control channel capacity by occupying resources in the PDSCH region. The control channel element (CCE) of E-PDCCH is defined as The number of OFDM symbols of consecutive subcarriers*PDSCH, such as figure 1 shown. The demodulation of the E-PDCCH is based on DM-RS. It can be seen that the structure of the E-PDCCH is similar to that of the PDSCH. Therefore, the MU-MIMO transmission scheme can be considered to be introduced into the E-PDCCH to further expand the control channel capacity. [0003] In R8 / 9 / 10, PDSCH is used to transmit downlink data, PUCCH 1a / 1b is used to transmit ACK / NACK information of PDSCH, and PDCCH is used to transmit DCI information of PDSCH on the same subframe. Which PUCCH resour...
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IPC IPC(8): H04L1/00H04L1/16H04L5/00
Inventor陈哲鲁智池连刚
OwnerPOTEVIO INFORMATION TECH CO LTD