Method and apparatus of communication between terminal and base station, and network access method and apparatus of a terminal

1. A method performed by a terminal for communication with a base station, comprising:

sending, by the terminal, a network access request frame with a first preamble to a relay device, wherein the relay device is configured to receive the network access request frame according to the first preamble, send the network access request frame with a second preamble to the base station, and receive a network access response frame returned by the base station, the length of the second preamble being shorter than that of the first preamble;

receiving, by the terminal, the network access response frame sent by the relay device; and

in accordance with determining that the terminal does not receive the network access response frame within a first receiving window or a second receiving window after sending the network access request frame with the first preamble, sending, by the terminal, the network access request frame with the second preamble to the base station.

2. The method according to claim 1 , further comprising:

sending, by the terminal, an uplink data frame with the first preamble to the relay device, wherein the relay device is further configured to receive the uplink data frame according to the first preamble, send the uplink data frame with the second preamble to the base station, and receive a downlink data frame returned by the base station; and

receiving, by the terminal, the downlink data frame sent by the relay device.

3. The method according to claim 1 , wherein sending the network access request frame with the first preamble to the relay device further comprises:

in accordance with determining that the terminal does not receive the network access response frame within a first receiving window or a second receiving window after sending the network access request frame with the second preamble, sending, by the terminal, the network access request frame with the first preamble to the relay device;

or

in accordance with determining that the terminal receives the network access response frame within the second receiving window after sending the network access request frame with the second preamble, sending, by the terminal, the network access request frame with the first preamble to the relay device.

4. The method according to claim 1 , further comprising:

in accordance with determining that the terminal receives the network access response frame within a first receiving window after sending the network access request frame with the first preamble, sending, by the terminal, the network access request frame with the second preamble to the base station.

5. The method according to claim 1 , wherein receiving the network access response frame sent by the relay device further comprises:

receiving, by the terminal, the network access response frame sent by the relay device within a second receiving window after sending the network access request frame with the first preamble.

6. The method according to claim 2 , wherein receiving the downlink data frame sent by the relay device further comprises:

receiving, by the terminal, the downlink data frame sent by the relay device within a second receiving window after sending the uplink data frame with the first preamble.

7. A terminal in communication with a base station, comprising:

a memory storing a set of instructions; and

one or more processors configured to execute the set of instructions to cause the apparatus to perform:

sending a network access request frame with a first preamble to a relay device, wherein the relay device is configured to receive the network access request frame according to the first preamble, send the network access request frame with a second preamble to the base station, and receive a network access response frame returned by the base station, the length of the second preamble being shorter than that of the first preamble;

receiving the network access response frame sent by the relay device; and

sending the network access request frame with the second preamble to the base station, in accordance with determining that the terminal does not receive the network access response frame within the first receiving window or a second receiving window after sending the network access request frame with the first preamble.

8. The terminal according to claim 7 , wherein the memory further stores instructions that, when executed by the one or more processors, cause the terminal to perform:

sending an uplink data frame with the first preamble to the relay device, wherein the relay device is further configured to receive the uplink data frame according to the first preamble, send the uplink data frame with the second preamble to the base station, and receive a downlink data frame returned by the base station; and

receiving the downlink data frame sent by the relay device.

9. The terminal according to claim 7 , wherein sending the network access request frame with the first preamble to the relay device further comprises:

sending, by the terminal, the network access request frame with the first preamble to the relay device, in accordance with determining that the terminal does not receive the network access response frame within a first receiving window or a second receiving window after sending the network access request frame with the second preamble;

or

sending, by the terminal, the network access request frame with the first preamble to the relay device, in accordance with determining that the terminal receives the network access response frame within the second receiving window after sending the network access request frame with the second preamble.

10. The terminal according to claim 7 , wherein the memory further stores instructions that, when executed by the one or more processors, cause the terminal to perform:

sending the network access request frame with the second preamble to the base station, in accordance with determining that the terminal receives the network access response frame within a first receiving window after sending the network access request frame with the first preamble.

11. The terminal according to claim 7 , wherein receiving the network access response frame sent by the relay device further comprises:

receiving the network access response frame sent by the relay device within a second receiving window after sending the network access request frame with the first preamble.

12. The terminal according to claim 8 , wherein receiving the network access response frame sent by the relay device further comprises:

receiving the downlink data frame sent by the relay device within a second receiving window after sending the uplink data frame with the first preamble.

13. A non-transitory computer readable medium that stores a set of instructions that is executable by at least one processor of a computer to cause the computer to perform a method for communication between a terminal and a base station, the method comprising:

sending, by the terminal, a network access request frame with a first preamble to a relay device, wherein the relay device is configured to receive the network access request frame according to the first preamble, send the network access request frame with a second preamble to the base station, and receive a network access response frame returned by the base station, the length of the second preamble being shorter than that of the first preamble;

receiving, by the terminal, the network access response frame sent by the relay device; and

in accordance with determining that the terminal does not receive the network access response frame within the first receiving window or a second receiving window after sending the network access request frame with the first preamble, sending, by the terminal, the network access request frame with the second preamble to the base station.

14. The non-transitory computer readable medium according to claim 13 , wherein the method further comprises:

sending, by the terminal, an uplink data frame with the first preamble to the relay device, wherein the relay device is further configured to receive the uplink data frame according to the first preamble, send the uplink data frame with the second preamble to the base station, and receive a downlink data frame returned by the base station; and

receiving, by the terminal, the downlink data frame sent by the relay device.

15. The non-transitory computer readable medium according to claim 13 , wherein sending the network access request frame with the first preamble to the relay device further comprises:

in accordance with determining that the terminal does not receive the network access response frame within a first receiving window or a second receiving window after sending the network access request frame with the second preamble, sending, by the terminal, the network access request frame with the first preamble to the relay device;

or

in accordance with determining that the terminal receives the network access response frame within the second receiving window after sending the network access request frame with the second preamble, sending, by the terminal, the network access request frame with the first preamble to the relay device.

16. The non-transitory computer readable medium according to claim 13 , wherein the method further comprises:

in accordance with determining that the terminal receives the network access response frame within a first receiving window after sending the network access request frame with the first preamble, sending, by the terminal, the network access request frame with the second preamble to the base station.

17. The non-transitory computer readable medium according to claim 13 , wherein receiving the network access response frame sent by the relay device further comprises:

receiving, by the terminal, the network access response frame sent by the relay device within a second receiving window after sending the network access request frame with the first preamble.