Method of mapping downlink control signaling indication channel to physical resource

Abstract

The invention discloses a method of mapping a downlink control signaling direction channel on physical resources. The method includes that the data of downlink control signaling direction channel y(0), ellipsis y(15) are sequentially divided into groups with every four continuous subcarriers as a group after pilot is removed, and then are mapped on physical resources in the way as following: y(0), ellipsis y(3) are mapped on the resource units with the initial position as k1=k0; y(4), ellipsis y(7) are mapped on the resource units with the initial position as k2=k0+NRB / 2; y(8), ellipsis y(11) are mapped on the resource units with the initial position as k3=k0+2NRB / 2=k0+NRB; y(12), ellipsis y(15) are mapped on the resource units with the initial position as k4=k0+3NRB / 2; wherein, k0=N<CELL>IDmod (NRB / 2); NRB stands for the number of the resource blocks in system bandwidth; NID<CELL> is a special ID for each cell. By using the present mapping method, the downlink control signaling direction channel can obtain the maximal frequency diversity gain.

Description

technical field [0001] The invention relates to a broadband wireless communication system, in particular to a method for mapping a downlink control signaling instruction channel to a physical resource in a 3GPP LTE (Long Term Evolution) system. Background technique [0002] In the LTE system, because resources appear in two dimensions of time and frequency, resource allocation and its representation methods become more complicated, especially when the bandwidth is relatively large, it is necessary to consider both the flexibility of resource allocation and Requirements such as the size of the coherent bandwidth. [0003] At present, in the LTE system, it is stipulated that a subframe has a time length of 1 ms and is composed of two equal time slots. The time length of each time slot is 0.5 ms. One resource unit contains one OFDM symbol. Each OFDM A subcarrier in a symbol belongs to the resource unit, and a common method for resource representation is to define a basic resou...

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Problems solved by technology

[0011] In the LTE system, the resource allocation of the downlink control signaling indication channel is allocated as a group of 4 consecutive subcarriers, while in the system bandwidth, after removing the pilot frequency, it is divided into groups of 4 consecutive subcarriers , the total number of groups is 2N RB DL , and the downlink control signaling indicates that the modulated data of the channel is 16, which needs to be mapped to four groups. If the mapping is performed according to the formula in the above draft standard, the downlink control signaling indicates that the channel data will be distributed unevenly on the entire system bandwidth. , the maximum frequency diversity gain cannot be obtained. Therefore, this paper presents a new representation method of downlink control signaling indicating channel-to-physical resource mapping to obtain the maximum frequency diversity gain

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