Method and device for two-step random accessing

1. A method of a terminal device to random accessing to a network, comprising:

transmitting, to a network device on a time-frequency resource, a random access preamble and a data block comprising data information and a reference signal associated with the data information, wherein the data information is encoded with a scrambling code and the reference signal is encoded with an orthogonal cover code (OCC) or a cyclic shift (CS); and

receiving, from the network device, a response message for the random accessing.

2. The method of claim 1 , wherein the random access preamble belongs to a plurality of random access preambles which are associated with the time-frequency resource for data.

3. The method of claim 2 , further comprising:

selecting the random access preamble from the plurality of random access preambles;

determining the scrambling code according to the selected random access preamble;

determining the orthogonal cover code and the time-frequency resource according to the selected random access preamble; and

encoding the data information using the determined scrambling code.

4. The method of claim 3 , further comprising:

encoding the reference signal associated with the data information using the orthogonal cover code.

5. The method of claim 2 , further comprising:

selecting the random access preamble from the plurality of random access preambles;

determining the orthogonal cover code, the cyclic shift and the time-frequency resource according to the selected random access preamble; and

encoding the reference signal associated with the data information using the cyclic shift;

encoding the data information using the scrambling code.

6. The method of claim 2 , further comprising:

the terminal device selecting the random access preamble from the plurality of random access preambles;

the terminal device determining the cyclic shift, the time-frequency resource and the scrambling code according to the selected random access preamble;

the terminal device encoding the reference signal associated with the data information using the cyclic shift; and

the terminal device encoding the data information by scrambling the data information using the scrambling code.

7. The method of claim 1 , further comprising:

determining a maximum multiplexing level according to configuration information of the random accessing;

determining a transmission power boost of the data according to the maximum multiplexing level.

8. The method of claim 7 , wherein a power offset for the transmission power boost is configured by a system message, or is predefined.

9. The method of claim 1 , wherein a relationship between the random access preamble and one or more of the orthogonal cover code, the cyclic shift, the time-frequency resource and the scrambling code is/are predefined.

10. The method of claim 1 , wherein a minimum distance between two adjacent cyclic shifts is configured to be maximized.

11. A method performed by a network device, comprising:

receiving a random access preamble and a data block transmitted by a terminal device on a time-frequency resource, wherein the data block comprises data information and a reference signal associated with the data information, the data information is encoded with a scrambling code, and the reference signal associated with the data information is encoded with an orthogonal cover code and/or a cyclic shift;

decoding the data information transmitted on the time-frequency resource;

transmitting to the terminal device a response message.

12. The method of claim 11 , wherein the random access preamble belongs to a plurality of random access preambles which are associated with the time-frequency resource for data.

13. The method of claim 11 , wherein the method further comprising:

determining a multiplexing level according to a detection of the random access preambles.

14. A terminal device, comprising a processor and a memory, wherein the memory containing instructions executable by the processor whereby the terminal device is operative to:

transmit, to a network device on a time-frequency resource, a random access preamble and a data block comprising data information and a reference signal associated with the data information, wherein the data information is encoded with a scrambling code and the reference signal is encoded with an orthogonal cover code (OCC) or a cyclic shift (CS); and

receive, from the network device, a response message for the random accessing.

15. The terminal device of claim 14 , wherein

the random access preamble belongs to a plurality of random access preambles which are associated with the time-frequency resource for data, and

the terminal device is further operative to:

select the random access preamble from the plurality of random access preambles;

determine the orthogonal cover code and the time-frequency resource according to the random access preamble;

encode the data information using the scrambling code; and

encode the reference signal associated with the data information using the orthogonal cover code.

16. The terminal device of claim 14 , wherein

the random access preamble belongs to a plurality of random access preambles which are associated with the time-frequency resource for data, and

the terminal device is operative to:

select the random access preamble from the plurality of random access preambles;

determine the orthogonal cover code, the cyclic shift and the time-frequency resource according to the random access preamble;

encode the data information using the scrambling code; and

encode the reference signal associated with the data information using the cyclic shift.

17. The terminal device of claim 14 , wherein

the random access preamble belongs to a plurality of random access preambles which are associated with the time-frequency resource for data, and

the terminal device is operative to:

select the random access preamble from the plurality of random access preambles;

determine the cyclic shift, the time-frequency resource, and the scrambling code according to the random access preamble;

encode the data information by scrambling the data information using the scrambling code; and

encode the reference signal associated with the data information using the cyclic shift.

18. A network device, comprising a processor and a memory, wherein the memory containing instructions executable by the processor whereby the network device is operative to:

receive a random access preamble and a data block transmitted by a terminal device on a time-frequency resource, wherein the data block comprises data information and a reference signal associated with the data information, the data information is encoded with a scrambling code, and the reference signal associated with the data information is encoded with an orthogonal cover code and/or a cyclic shift;

decode the data information transmitted on the time-frequency resource;

transmit to the terminal device a response message.

19. The network device of claim 18 , wherein the random access preamble belongs to a plurality of random access preambles which are associated with the time-frequency resource for data.

20. The network device of claim 18 , wherein the network device is operative to:

determine a multiplexing level according to a detection of the random access preambles.