Method and device for determining downlink control channel DMRS (Demodulation Reference Signal) resource
A technology for control channel resources and control channels, which is applied in the field of determining downlink control channel DMRS resources, and can solve problems such as no clear scheme.
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Embodiment 1
[0183] Embodiment 1: It is assumed that the downlink control channel transmitted in the first part of the downlink control channel resource set supports at most 4 DMRS ports, and the number of supported ports is 1, 2, and 4. And it is assumed that the number of REs occupied by a port in an RB is 2. Frequency division or code division may be used between different antenna ports. Then the DMRS mapping pattern can be as follows Figure 4 with Figure 5 shown. The base station may select a DMRS mapping pattern used for downlink control channel transmission from a predefined set of DMRS mapping patterns according to channel conditions, transmission requirements, and the like. For example, in a scenario where precoder cycling is required, the base station can choose a single-port DMRS mapping pattern; in a scenario where SFBC is required, a two-port or four-port DMRS mapping pattern can be selected; in a low bit rate scenario, a four-port mapping pattern can be selected DMRS map...
Embodiment 2
[0191] Embodiment 2: For the downlink control channel transmitted in the first part of the downlink control channel resource set, the DMRS mapping pattern used for transmission is the same as the DMRS mapping pattern used for PBCH transmission. After successfully receiving the PBCH, the terminal knows the DMRS mapping pattern used by the downlink control channel transmitted in the first part of the downlink control channel resource set. For example, the DMRS mapping pattern used for PBCH transmission is single-port mapping, and the downlink control channel transmitted in the first part of the downlink control channel resource set uses the single-port DMRS mapping pattern. Alternatively, the DMRS mapping pattern used by the downlink control channel transmitted in the first part of the downlink control channel resource set is defined by the protocol. For example, a single-port DMRS mapping pattern, two-port or four-port is used.
[0192] Further, the base station may indicate t...
Embodiment 3
[0193] Embodiment 3: It is assumed that the downlink control channel transmitted in the second part of the downlink control channel resource set supports a maximum of 4 DMRS ports, and the number of supported ports is 1, 2, and 4. And it is assumed that the number of REs occupied by a port in an RB is 2. Frequency division or code division may be used between different antenna ports. Then the DMRS mapping pattern can be as follows Figure 4 with Figure 5 shown. The base station may select a DMRS mapping pattern used for downlink control channel transmission from a predefined set of DMRS mapping patterns according to channel conditions, transmission requirements, and the like. For example, in the scenario where precoder cycling is required, the base station can choose a single-port DMRS mapping pattern; in the scenario where SFBC (Space Frequency Block Code, Space Frequency Block Code) is required, a two-port or four-port DMRS mapping pattern can be selected ; In low bit r...
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