Data transmission method and apparatus

1. A data transmission method, comprising,

receiving, by a communications node, N spatial reuse parameters (SRPs), N being a positive integer;

determining, by the communications node based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission; and

transmitting, by the communications node, data by using a spatial reuse link,

wherein

the determining, by the communications node based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission comprises:

determining, by the communications node based on a current moment T, Q effective SRPs of the N SRPs, wherein Q is a positive integer less than or equal to N, and the effective SRPs are SRPs whose corresponding transmission opportunity (TXOP) transmission times comprise the current moment T;

adjusting, by the communications node, a transmit parameter to meet the Q effective SRPs, wherein the transmit parameter of the communications node is a function of the Q effective SRPs:

TX =ƒ(SRP1,SRP2, . . . ,SRP Q ); and

if the transmit parameter meets a transmission requirement of the spatial reuse link, determining that the communications node is capable of performing spatial reuse link transmission.

2. The method according to claim 1 , wherein

TXOP transmission times corresponding to the N SRPs are N different TXOP transmission times; or

TXOP transmission times corresponding to the N SRPs are O different TXOP transmission times, wherein O is a positive integer less than N.

3. The method according to claim 1 , wherein

the function TX=ƒ(SRP1, SRP2, . . . , SRPQ) is specifically:

TX=P =min{ P 1 (SRP1), P 2 (SRP2), . . . , P Q (SRP Q )},

wherein P i (SRPi) is a maximum allowable value of a transmit power meeting SRPi; and

if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission.

4. The method according to claim 1 , wherein

at least one of the SRPs comprises a clear channel assessment (CCA) value of a spatial reuse link required by a transmission link on which a physical layer protocol data unit (PPDU) carrying the SRP is transmitted;

the communications node determines, according to the following formula, a CCA value for performing transmission by using the spatial reuse link:

CCA=min{SRP1,SRP2, . . . ,SRP Q};

the communications node determines, according to the following formula, a maximum value of a transmit power for performing transmission by using the spatial reuse link:

P=P 0 −(CCA−CCM 0 ),

wherein P 0 is a maximum transmit power of the communications node during non-spatial reuse link transmission, and CCA 0 is a CCA value of the communications node during non-spatial reuse link transmission; and

if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission.

5. A communications node, comprising:

a receiver, configured to receive N spatial reuse parameters (SRPs), N being a positive integer; and

a processor, configured to determine, based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission, wherein the communications node transmits data by using a spatial reuse link,

and wherein the processor is further configured to:

determine, based on a current moment T, Q effective SRPs of the N SRPs, wherein Q is a positive integer less than or equal to N, and the effective SRPs are SRPs whose corresponding transmission opportunity (TXOP) transmission times comprise the current moment T;

adjust a transmit parameter to meet the Q effective SRPs, wherein the transmit parameter is a function of the Q effective SRPs:

TX =ƒ(SRP1,SRP2, . . . ,SRP Q ); and

if the transmit parameter meets a transmission requirement of the spatial reuse link, determine that the communications node is capable of performing spatial reuse link transmission.

6. The communications node according to claim 5 , wherein

TXOP transmission times corresponding to the N SRPs are N different TXOP transmission times; or

TXOP transmission times corresponding to the N SRPs are O different TXOP transmission times, wherein O is a positive integer less than N.

7. The communications node according to claim 5 , wherein

the function TX=ƒ(SRP1, SRP2, . . . , SRPQ) is:

TX=P =min{ P 1 (SRP1), P 2 (SRP2), . . . , P Q (SRP Q )},

wherein P i (SRPi) is a maximum allowable value of a transmit power meeting SRPi; and

if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission.

8. The communications node according to claim 5 , wherein

at least one of the SRPs comprises a clear channel assessment (CCA) value of a spatial reuse link required by a transmission link on which a physical layer protocol data unit (PPDU) carrying the SRP is transmitted;

the processor is further configured to determine, according to the following formula, a CCA value for performing transmission by using the spatial reuse link:

CCA=min{SRP1,SRP2, . . . ,SRP Q};

the processor determines, according to the following formula, a maximum value of a transmit power for performing transmission by using the spatial reuse link:

P=P 0 −(CCA−CCA 0 ),

wherein P 0 is a maximum transmit power of the communications node during non-spatial reuse link transmission, and CCA 0 is a CCA value of the communications node during non-spatial reuse link transmission; and

if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission.