Data transmission method and apparatus

• US 10,554,328 B2
• Filed: 12/29/2017
• Issued: 02/04/2020
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Xu, Xiuqiang, Liu, Yalin, Chen, Yan
• Primary Examiner(s): Thier, Michael
• Assistant Examiner(s): Cox, Brian P
• Application Number:
  US15/858,843
• Publication Number:
  US 20180145790A1
• Time in Patent Office: 767 Days
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04L 1/001 applied to control information
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

Embodiments of the present invention provide a data transmission method and apparatus. The method includes: determining a contention transmission unit CTU to be used by to-be-sent uplink data, where the CTU is a transmission resource including at least a time domain resource, a frequency domain resource, and a code domain resource; encoding the to-be-sent uplink data by using N different code element groups in the code domain resource corresponding to the determined CTU, to obtain N groups of encoded data, where N is a positive integer greater than or equal to 2; and sending the N groups of encoded data by using the time domain and frequency domain resources that are corresponding to the determined CTU. According to the embodiments of the present invention, data reception reliability at a receive end can be improved.

Claims

1. A data transmission method, comprising:

determining a contention transmission unit (CTU) to be used by to-be-sent uplink data, wherein the CTU is a transmission resource comprising at least a time domain resource, a frequency domain resource, and a code domain resource;

encoding the to-be-sent uplink data by using N different code element groups in the code domain resource corresponding to the determined CTU, to obtain N groups of encoded data, wherein each group of the N groups of encoded data comprises a control word and a data portion, wherein the control word is used to instruct a receive end whether to perform combined decoding on a corresponding data portion in the encoded data, and wherein N is a positive integer greater than or equal to 2; and

sending the N groups of encoded data by using the time domain and frequency domain resources that are corresponding to the determined CTU.

2. The method according to claim 1, wherein control words comprised in P groups of the N groups of encoded data are used to instruct the receive end to perform combined decoding on a corresponding data portion in the encoded data, wherein channel encoding bit rates of data portions in the P groups of encoded data are the same, and P is a positive integer greater than or equal to 2 and less than or equal to N.

3. The method according to claim 1, wherein a bit rate for performing channel encoding on the control word is less than a bit rate for performing channel encoding on the data portion in the to-be-sent uplink data.

4. The method according to claim 1, wherein a code element in the code domain resource is a Code Division Multiple Access (CDMA) code, a sparse code multiple access (SCMA) codebook, or a low-density signature LDS sequence.

5. The method according to claim 4, wherein the SCMA codebook comprises two or more code words, the code word is a multi-dimensional complex number vector, and is used to represent a mapping relationship between data and at least two modulation symbols, and the at least two modulation symbols comprise at least one zero modulation symbol and at least one non-zero modulation symbol.

6. The method according to claim 1, wherein the transmission resource further comprises a pilot resource, wherein the code element of the code domain resource and the pilot resource constitute a code element-pilot combination, pilots in different code element-pilot combinations are mutually orthogonal, and code elements in code element groups in different code element-pilot combinations are different.

7. The method according to claim 6, wherein the method further comprises:

sending, by using the time domain and frequency domain resources that are corresponding to the determined CTU, a pilot sequence in a code element-pilot combination corresponding to the N groups of encoded data.

8. A data transmission method, comprising:

determining a contention transmission unit (CTU) to be used by to-be-sent uplink data, wherein the CTU is a transmission resource comprising at least a time domain resource, a frequency domain resource, a code domain resource, and a pilot resource, a code element of the code domain resource and the pilot resource constitute a code element-pilot combination, and pilots in different code element-pilot combinations are mutually orthogonal;

encoding the to-be-sent uplink data by using code elements in N different code element-pilot combinations in the transmission resource corresponding to the determined CTU, to obtain N groups of encoded data, wherein each group of the N groups of encoded data comprises a control word and a data portion, wherein the control word is used to instruct a receive end whether to perform combined decoding on a corresponding data portion in the encoded data, and wherein N is a positive integer greater than or equal to 2; and

sending, by using the time domain and frequency domain resources that are corresponding to the determined CTU, the N groups of encoded data and pilots in the N code element-pilot combinations.

9. The method according to claim 8, wherein the code element-pilot combination comprises at least one code element and one pilot.

10. A data transmission apparatus, comprising:

a processor configured to;

determine a contention transmission unit (CTU) to be used by to-be-sent uplink data, wherein the CTU is a transmission resource comprising at least a time domain resource, a frequency domain resource, a code domain resource, and a pilot resource, a code element of the code domain resource and the pilot resource constitute a code element-pilot combination, and pilots in different code element-pilot combinations are mutually orthogonal; and

encode the to-be-sent uplink data by using code elements in N different code element-pilot combinations in the transmission resource corresponding to the determined CTU, to obtain N groups of encoded data, wherein each group of the N groups of encoded data comprises a control word, wherein the control word is used to instruct a receive end whether to perform combined decoding on a corresponding data portion in the encoded data, and wherein N is a positive integer greater than or equal to 2; and

a transmitter configured to send, by using the time domain and frequency domain resources that are corresponding to the CTU determined by the processor, the N groups of encoded data and pilots in the N code element-pilot combinations.

11. The apparatus according to claim 10, wherein control words comprised in P groups of the N groups of encoded data are used to instruct the receive end to perform combined decoding on a corresponding data portion in the encoded data, wherein channel encoding bit rates of data portions in the P groups of encoded data are the same.

12. The apparatus according to claim 10, wherein a bit rate for performing channel encoding on the control word is less than a bit rate for performing channel encoding on the data portion in the to-be-sent uplink data.

13. The apparatus according to claim 10, wherein the code element is a Code Division Multiple Access (CDMA) code, a sparse code multiple access (SCMA) codebook, or a low-density signature LDS sequence.

14. The apparatus according to claim 13, wherein the SCMA codebook comprises two or more code words, the code word is a multi-dimensional complex number vector, and is used to represent a mapping relationship between data and at least two modulation symbols, and the at least two modulation symbols comprise at least one zero modulation symbol and at least one non-zero modulation symbol.

15. The apparatus according to claim 10, wherein code elements in all or some code element-pilot combinations comprised in the CTU are the same.

16. The apparatus according to claim 10, wherein the code element-pilot combination comprises at least one code element and one pilot.

17. A data transmission apparatus, comprising:

a receiver configured to receive, on time domain and frequency domain resources of a contention transmission unit (CTU), a control word in uplink data, wherein the CTU is a transmission resource comprising at least the time domain resource, the frequency domain resource, and a code domain resource, and instruction information is used to instruct whether to perform combined decoding on a corresponding data portion; and

a processor configured to decode the control word by using a code element of the code domain resource of the CTU, to obtain the instruction information, and to perform combined decoding on data portions of uplink data that is sent by a same terminal device and in which the instruction information instructs to perform combined decoding on the corresponding data portions of the uplink data.