Method and device for determining search space and candidate control channel resource

Abstract

The invention provides a method and device for determining a search space and a candidate control channel resource. The method comprises the following steps of: determining the bit number of downlink control information of each control channel which currently needs to be monitored by UE (user equipment); according to a mapping relationship between unit carrier wave for carrying data information channels and unit carrier wave for carrying control channels, which are used by UE currently, determining a temporary searching space which corresponds to each control channel which needs to be monitored by UE; and for the control channels which are same in CCE (communication control equipment) polymerization level and need to be monitored by UE currently, when the bit number of the downlink control information of one or more than one control channel is as same as the bit number of the downlink control information of a selected control channel, determining the practical search space which corresponds to the selected control channel is all or a part of CCE of the sum of the temporary search spaces corresponding to all or a part of control channels which are same in bit number of the downlinkcontrol information. Through adoption of the scheme, the probability of scheduling collision of PDCCH (physical downlink control channel) in a carrier wave polymerization system can be reduced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for determining search space and candidate control channel resources. Background technique [0002] In a Long Term Evolution (LTE) system, before a user equipment (User Equipment, UE) receives or sends service data, it needs to know the downlink control information (Downlink Control Information) configured for the user equipment by an evolved base station (Evolved NodeB, eNB). Information, DCI), the DCI is carried by a physical layer downlink control channel (Physical Downlink Control channel, PDCCH). A PDCCH is aggregated by 1, 2, 4 or 8 consecutive Control Channel Elements (CCE), and each aggregation level corresponds to a search space (see Table 1). The aggregation level indicates that a PDCCH is composed of Several CCEs are aggregated, and the search space is the PDCCH set to be detected by the UE. Wherein, the search space may be divided ...

AI Technical Summary

Problems solved by technology

[0006] In a carrier aggregation (carrier aggregation, CA) system, the user equipment can use multiple component carriers (component carriers, CCs) carrying data channels at the same time, and the data scheduling or power control of each component carrier carrying data channels is configured with a corresponding One DCI is used to indicate that different DCIs are carried on different PDCCHs. When these PDCCHs are carried on one component carrier carrying control channels or a few component carriers carrying control channels, due to the search The space size is limited, so the probability of PDCCH scheduling collision (blocking) is very high

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