Physical downlink control channel (PDCCH) resource configuration application method and apparatus thereof

Abstract

The present application relates to the field of communications. Disclosed are a PDCCH resource allocation method and device, for reducing the probability of the PDCCH blocking in a system. The method comprises: according to the member carrier set allocated for a UE and the carrier aggregation (CA) capability information of the UE, both a base station and the UE determine the number of PDCCH candidates under every CCE aggregation level in the PDCCH search space corresponding to each member carrier in the member carrier set; the base station transmits DCI to the UE on the determined PDCCH candidates; and the UE conducts a blind detection on the determined PDCCH candidates to obtain the DCI transmitted by the base station. The present invention not only greatly improves the total number of times of the PDCCH blind detection actually executed by the UE within the allowable capability range of the UE, but also ensures that the total number of times of the PDCCH blind detection actually executed by the UE does not exceed the maximum times of PDCCH blind detection supported by the UE, thus avoiding PDCCH blocking and improving system performance.

Description

technical field [0001] The present invention relates to the communication field, in particular to a PDCCH resource configuration and application method and device. Background technique [0002] In the LTE (Long Term Evolution, Long Term Evolution) Rel8 system, the terminal needs to simultaneously perform blind detection on a PDCCH (physical downlink control channel, physical downlink control channel) in the common search space and the UE-specific search space. In the common search space, the CCE (Control Channel Element) aggregation levels of PDCCH can only be 4 and 8. Correspondingly, under each CCE aggregation level, the number of candidate PDCCHs that need blind detection is 4 and 8 respectively. 2; In the UE-specific search space, the CCE aggregation levels of PDCCH can be 1, 2, 4, and 8; and under each CCE aggregation level, the number of candidate PDCCHs that need blind detection is different. In 3GPP TS36 The description is given in 9.1.1 of .213, as shown in Table 1...

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Problems solved by technology

[0044] It can be seen that in the PDCCH search space defined in the LTE-A system, regardless of the CA aggregation capability of the UE, the size of the PDCCH search space agreed between the UE and the network side is always related to the CCs included in the PDSCH / PUSCH CC set. The maximum number of blind detection times supported by the UE is not fully utilized. With the development of smart terminal technology, the blind detection capability of the UE is increasing. If the PDCCH search space is still configured for the UE in the traditional way, it will cause a gap between the UE capability and the PDCCH resource. Mismatch; especially in the case of a large number of UEs, configuring the PDCCH search space according to the traditional method will cause PDCCH blocking, reduce system throughput, and affect system performance

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