A transmission parameter indication method for an access device, comprising: generating transmission parameter indication information, wherein the transmission parameter indication information is used to indicate a transmission parameter entry selected from a transmission parameter entry set corresponding to a current coherence capability of a terminal device, and the transmission parameter entry is used to indicate a quantity of transmission layers and a precoding matrix; and sending the transmission parameter indication information, wherein the current coherence capability is one of the following capabilities: "fully coherent"; "partial-coherent"; and "incoherent", wherein a transmission parameter entry set corresponding to each coherence capability comprises at least one transmission parameter entry, a transmission parameter entry set corresponding to "incoherent" is a subset of a transmission parameter entry set corresponding to "partial-coherent", and the transmission parameter entry set corresponding to "partial-coherent" is a subset of a transmission parameter entry set corresponding to "fully coherent", wherein the transmission parameter indication information is as follows: Field index Fully coherent transmission Field index Partially coherent transmission Field index Incoherent transmission 0 One layer: TPMI=0 0 One layer: TPMI=0 0 One layer: TPMI=0 1 One layer: TPMI=1 1 One layer: TPMI=L 1 One layer: TPMI=1.................. 3 One layer: TPMI=3 3 One layer: TPMI=3 3 One layer: TPMI=3 4 Two layers: TPMI=0 4 Two layers: TPMI=0 4 Two layers: TPMI=0.................. 9 Two layers: TPMI=5 9 Two layers: TPMI=5 9 Two layers: TPMI=5 10 Three layers: TPMI=0 10 Three layers: TPMI=0 10 Three layers: TPMI=0 11 Four layers: TPMI=0 11 Four layers: TPMI=0 11 Four layers: TPMI=0 12 One layer: TPMI=4 12 One layer: TPMI=4............ 19 One layer: TPMI=11 19 One layer: TPMI=11 20 Two layers: TPMI=6 20 Two layers: TPMI=6............ 27 Two layers: TPMI=13 27 Two layers: TPMI=13 28 Three layers: TPMI=1 28 Three layers: TPMI=1 29 Three layers: TPMI=2 29 Three layers: TPMI=2 30 Four layers: TPMI=1 30 Four layers: TPMI=1 31 Four layers: TPMI=2 31 Four layers: TPMI=2 32 One layer: TPMI=12...... 47 One layer: TPMI=27 48 Two layers: TPMI=14...... 55 Two layers: TPMI=21 56 Three layers: TPMI=3...... 59 Three layers: TPMI=6 60 Four layers: TPMI=3 61 Four layers: TPMI=4 generating transmission parameter indication information, wherein the transmission parameter indication information is used to indicate a transmission parameter entry selected from a transmission parameter entry set corresponding to a current coherence capability of a terminal device, and the transmission parameter entry is used to indicate a quantity of transmission layers and a precoding matrix; and sending the transmission parameter indication information, wherein the current coherence capability is one of the following capabilities: "fully coherent"; "partial-coherent"; and "incoherent", "fully coherent"; "partial-coherent"; and "incoherent", wherein a transmission parameter entry set corresponding to each coherence capability comprises at least one transmission parameter entry, a transmission parameter entry set corresponding to "incoherent" is a subset of a transmission parameter entry set corresponding to "partial-coherent", and the transmission parameter entry set corresponding to "partial-coherent" is a subset of a transmission parameter entry set corresponding to "fully coherent", wherein the transmission parameter indication information is as follows: Field index Fully coherent transmission Field index Partially coherent transmission Field index Incoherent transmission 0 One layer: TPMI=0 0 One layer: TPMI=0 0 One layer: TPMI=0 1 One layer: TPMI=1 1 One layer: TPMI=L 1 One layer: TPMI=1.................. 3 One layer: TPMI=3 3 One layer: TPMI=3 3 One layer: TPMI=3 4 Two layers: TPMI=0 4 Two layers: TPMI=0 4 Two layers: TPMI=0.................. 9 Two layers: TPMI=5 9 Two layers: TPMI=5 9 Two layers: TPMI=5 10 Three layers: TPMI=0 10 Three layers: TPMI=0 10 Three layers: TPMI=0 11 Four layers: TPMI=0 11 Four layers: TPMI=0 11 Four layers: TPMI=0 12 One layer: TPMI=4 12 One layer: TPMI=4............ 19 One layer: TPMI=11 19 One layer: TPMI=11 20 Two layers: TPMI=6 20 Two layers: TPMI=6............ 27 Two layers: TPMI=13 27 Two layers: TPMI=13 28 Three layers: TPMI=1 28 Three layers: TPMI=1 29 Three layers: TPMI=2 29 Three layers: TPMI=2 30 Four layers: TPMI=1 30 Four layers: TPMI=1 31 Four layers: TPMI=2 31 Four layers: TPMI=2 32 One layer: TPMI=12...... 47 One layer: TPMI=27 48 Two layers: TPMI=14...... 55 Two layers: TPMI=21 56 Three layers: TPMI=3...... 59 Three layers: TPMI=6 60 Four layers: TPMI=3 61 Four layers: TPMI=4