Method and system for equalizing distribution of physical downlink control channels

Abstract

The invention discloses a method and a system for equalizing the distribution of physical downlink control channels. The method includes the following steps: a base station sequentially chooses idle C-RNTIs (cell radio network temporary identifier), and respectively calculates a search space corresponding to each C-RNTI, and if the resource utilization rate of a CCE (control channel element) occupied by one of the search spaces is less than a designated value, the C-RNTI is put into a to-add list; one or more C-RNTIs are chosen from the to-add list and sent to a terminal; after storage, the terminal sends an acknowledgement message to the base station; after receiving the acknowledgement message, the base station locally updates the search spaces corresponding to the terminal, and PDCCH (physical downlink control channel) data corresponding to the terminal are sent on all the search spaces corresponding to the terminal; and the terminal searches the corresponding PDCCH data on the corresponding search spaces. The technical scheme provided by the invention can equalize the distribution of PDCCHs on system resources and reduce the occurrence of PDCCH resource collision.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a method and system for balancing the distribution of physical downlink control channels. Background technique [0002] The downlink direction of LTE adopts Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing), wherein one radio frame of LTE includes 10 subframes (subframe) and 20 time slots (slot), and each downlink time slot is It is divided into several OFDM symbols, and the number of OFDM symbols included is also different according to the length of the CP. When a regular CP is used, one downlink time slot contains 7 OFDM symbols; when an extended CP is used, one downlink time slot contains 6 OFDM symbols. In this time-frequency resource block, a resource element (RE, Resource Element) is a resource defined by a symbol and a subcarrier, and a resource block (RB, Resource Bock) is the time occupied by 12 subcarriers and a do...

AI Technical Summary

Problems solved by technology

In the prior art, the pseudo-random position calculated based on RNTI should obey the average distribution in the sense of statistical average, but in actual situations, there may be a problem of unbalanced utilization of uncontrolled areas, because for a certain set of terminals, The terminal search space calculated by RNTI is concentrated in a certain part of the control area, which leads to a high probability of collision. At the same time, there are idle areas with low utilization in the control area, which leads to the failure of the overall system performance to the extreme.

figure 2 is a schematic diagram of PDCCH resource distribution in the prior art, such as figure 2 As shown, the PDCCHs of terminal 5 and terminal 6 cannot be sent due to insufficient resources, and at the same time there are idle resources available in other places

[0010] As mentioned above, in the prior art, with the increasing amount of downlink control information to be transmitted and the unbalanced distribution of PDCCH on system resources, it is easy to cause PDCCH resource collision for each terminal

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