Reception and configuration of downlink control channels
A downlink and control channel technology, which is applied in the field of configuring and transmitting the downlink control channel, can solve the problems of resource reduction and limited system capacity, etc.
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Embodiment 1
[0097] Example 1: Explicit configuration
[0098] In case an EPDCCH set is formed for a given user equipment, the search space start offset value for blind decoding by that user equipment in the corresponding EPDCCH set may be signaled by higher layers. In other words, in case an EPDCCH set is formed for an EPDCCH user equipment, the ECCE start offset value may be signaled by dynamic or higher layer signaling (eg higher layer RRC signaling) for forming the corresponding EPDCCH set. That is, the ECCE starting offset value may be included in a radio resource control (RRC) message. In addition, in this case, the ECCE start offset value may be combined with (i) configuration information of PRB groups (ie, N PRBs) forming the EPDCCH set and (ii) transmission type information (such as localized type or distributed type) is signaled. Here, the ECCE start offset value may indicate a start ECCE to be monitored by the user equipment at each aggregation level among the 2N ECCSs or the ...
Embodiment 2
[0103] Example 2: implicit configuration
[0104] Typically, a UE-specific search space (USS) may be defined at each aggregation level of a user equipment in a legacy (or typical) PDCCH. An ECCE index start offset for blind decoding performed by a corresponding user equipment in an EPDCCH set formed by each user equipment may be defined in a manner similar to this typical scheme. More specifically, the ECCE index start offset can be defined as (i) the RNTI of the corresponding user equipment, (ii) the subframe index (such as where n sis the slot index (i.e. the slot number in the radio frame), (iii) the aggregation level (AL), and (iv) the size of the corresponding EPDCCH set (i.e. the number of ECCEs (N ECCE ), such as a function of 2N or 4N).
[0105] In more detail, the search space start offset (ie ECCE start offset) may indicate a position from which blind decoding of a corresponding user equipment starts in a certain EPDCCH set formed for the user equipment. The sea...
Embodiment 3
[0110] Example 3: Hybrid configuration
[0111] The method for determining the ECCE start offset according to Embodiment 3 may correspond to a hybrid type combining implicit configuration and explicit configuration. First, the ECCE start offset value of each EPDCCH set can be determined by the method for determining the ECCE start offset according to Embodiment 1, and transmitted to the corresponding user equipment by higher layer signaling. However, based on the index of the downlink subframe in which the corresponding EPDCCH is transmitted, the user equipment may use a different ECCE start offset (i.e. an ECCE start offset different from the ECCE start offset value signaled by higher layers ). That is, the ECCE start offset value to be used by the corresponding user equipment in the corresponding EPDCCH set may be determined based on the following function: (i) the ECCE start offset value determined for the corresponding user equipment by higher layer signaling (herein ref...
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