Terminal and method for calculating channel quality indication information
Disclosed in the present document are a method and terminal for calculating channel quality indication information. The method includes: a terminal performing a channel measurement according to a received cell state information-reference signal (CSI-RS) or cell reference signal (CRS), determining a channel state information (CSI) reference resource, and determining channel quality indication (CQI) calculation conditions, then the terminal calculating a CQI value corresponding to the CSI reference resource according to the determined conditions and the measurement result. The present document makes a reasonable setting of the CQI calculation conditions, and ensures performance and effectiveness of system link self-adaptation.
1. A method for calculating channel quality indication information, comprising:
performing, by a user equipment (UE), a channel measurement based on a received Channel-State Information-Reference Symbol (CSI-RS) or a cell-specific reference signal (CRS),
determining, by the UE, a channel state information (CSI) reference source and calculating a CQI value corresponding to said CSI reference resource and channel quality indicator (CQI) calculation conditions, and thereafter
calculating, by the UE a CQI value corresponding to said CSI reference resource said determined conditions and according to a measurement result;
wherein, said determined CQI calculation conditions comprises: regardless whether a current sub-frame is a multicast broadcast-single frequency network (MB-SFN) subframe or non-MBSFN subframe, when said UE calculates said CQI, said UE calculates a CRS overhead of said current subframe in accordance with said non-MBSFN subframe.
2. The method of claim 1 , wherein,
said determined CQI calculation conditions comprises, for a transmission mode 9 :
when no precoding matrix indicator (PMI)/rank indication (RI) is configured, if a number of physical broadcast channel (PBCH) antenna ports is 1, a transmission mode being configured as single-antenna port transmission;
when no PMI/RI is configured, if the number of PBCH antenna ports is greater than 1, said transmission mode being configured as transmit diversity;
when said PMI/RI is configured, said transmission mode being configured as up to 8 layer transmission.
3. The method of claim 1 , wherein,
said determined CQI calculation conditions comprises, for said transmission mode 9 :
when no PMI/RI is configured, if the number of PBCH antenna ports is 1, said transmission mode being configured as single-antenna port transmission;
when no PMI/RI is configured, if the number of PBCH antenna ports is greater than 1, said transmission mode being configured as said transmit diversity;
when said PMI/RI is configured, if the number of CSI-RS ports is 1, said transmission mode being configured as single-antenna port transmission, and if said number of CSI-RS ports is greater than 1, said transmission mode being configured as up to 8 layer transmission.
4. The method of claim 2 , wherein,
Said up to 8 layer transmission comprises up to 8 layer closed-loop spatial multiplexing transmission and open-loop single-layer transmission.
5. The method of claim 3 , wherein,
said up to 8 layer transmission refers to up to 8 layer closed-loop spatial multiplexing transmission.
6. The method of claim 4 , wherein,
When said UE is configured with said PMI/RI, and the number of CSI-RS ports is greater than 1, said transmission mode is configured as up to 8 layer closed-loop spatial multiplexing transmission;
When said UE is configured with said PMI/RI, and the number of CSI-RS ports is equal to 1, said transmission mode is configured as open-loop single layer transmission.
7. The method of claim 5 , wherein,
said up to 8 layer closed-loop spatial multiplexing transmission comprises up to 8 layer single user multiple-input multiple-output (SU-MIMO), and up to 4 layer multiple user multiple-input multiple-output (MU-MIMO).
8. The method of claim 7 , wherein,
said up to 4 layer MU-MIMO supports four users and one layer transmission for each user, or supports two users, and two layer transmission for each user.
9. The method of claim 1 , wherein,
said channel measurement comprises performing, by the UE, a channel measurement based on said CRS if a base station is not configured with said PMI/RI and performing, by the UE, said channel measurement based on said CSI-RS if said base station is configured with said PMI/RI.
10. A terminal for calculating channel quality indication information, said terminal comprising:
a receiving module, configured to: receive a channel measurement based on a received Channel-State Information-Reference Symbol (CSI-RS) or a cell-specific reference signal (CRS) transmitted by a base station;
a measuring module, configured to: perform channel measurement according to said CSI-RS or CRS;
a determining module, configured to: determine a channel state information (CSI) reference source and channel quality indicator (CQI) calculation conditions;
a calculating module, configured to calculate a CQI value corresponding to said CSI reference resource in accordance with said determined conditions and a measurement result;
wherein, said determined CQI calculation conditions comprise: regardless of whether a current sub-frame is a multicast broadcast-single frequency network (MB-SFN) subframe, calculating a CRS overhead of said current subframe in accordance with said non MBSFN subframe when said terminal calculates the CQI.
11. The terminal of claim 10 , wherein,
said determining module is further configured as that: determined CQI calculation conditions comprises, for transmission mode 9 :
when no precoding matrix indicator (PMI)/rank indication (RI) is configured, if the number of PBCH antenna ports is 1, a transmission mode being configured as single-antenna port transmission;
when no PMI/RI is configured, if the number of PBCH antenna ports is greater than 1, said transmission mode being configured as transmit diversity;
when said PMI/RI is configured, the transmission mode being configured as up to 8 layer transmission.
12. The terminal of claim 10 , wherein,
said determining module being further configured as that: determined CQI calculation conditions comprises, for said transmission mode 9 :
when no PMI/RI is configured, if the number of PBCH antenna ports is 1, said transmission mode being configured as single-antenna port transmission;
when no PMI/RI is configured, if the number of PBCH antenna ports is greater than 1, said transmission mode being configured as transmit diversity;
when said PMI/RI is configured, if the number of CSI-RS ports is 1, said transmission mode being configured as single-antenna port transmission, if the number of CSI-RS ports is greater than 1, said transmission mode being configured as up to 8 layer transmission.
13. The terminal of claim 11 , wherein,
said up to 8 layer transmission comprises up to 8 layer closed-loop spatial multiplexing transmission and open-loop single-layer transmission.
14. The terminal of claim 12 , wherein,
said up to 8 layer transmission refers to up to 8 layer closed-loop spatial multiplexing transmission.
15. The terminal of claim 13 , wherein, said determining module is further configured to:
when said terminal is configured with PMI/RI and the number of CSI-RS ports is greater than 1, configure said transmission mode as up to 8 layer closed-loop spatial multiplexing transmission;
when said terminal is configured with said PMI/RI, and the number of CSI-RS ports is equal to 1, configure said transmission mode as open-loop single layer transmission.
16. The terminal of claim 14 , wherein,
said up to 8 layer closed-loop spatial multiplexing transmission comprises up to 8 layer SU-MIMO, and up to 4 layer MU-MIMO.
17. The terminal of claim 16 , wherein,
said up to 4 layer MU-MIMO supports four users and one layer transmission for each user, or supports two users and two layer transmission for each user.
18. The terminal of claim 10 , wherein,
said channel measurement comprises: if said base station is not configured with said PMI/RI, said terminal performing a channel measurement based on said CRS, and if said base station is configured with said PMI/RI, said terminal performing said channel measurement based on said CSI-RS.