Random access signalling resending method and apparatus

• US 20180084455A1
• Filed: 09/16/2015
• Published: 03/22/2018
• Est. Priority Date: 04/10/2015
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Liu, Kun, Dai, Bo, Lu, Zhaohua, Xia, Shuqiang, Chen, Xianming, Shi, Jing, Zhang, Wen, Fang, Huiying
• Granted Patent: US 10,455,448 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

Provided are a random access signalling resending method and apparatus. In the method, in the case where a first condition is satisfied, a second-type node is adopted to resend random access signalling Msg1, thereby solving the problem that the access quality of a user terminal accessing an LTE/LTE-A system is not high and improving the access quality of the user terminal accessing the LTE/LTE-A system.

Claims

1. A method for resending random access signaling, comprising:

under the circumstance that a first condition is met, resending, by a second-type node, random access signaling Message 1 (Msg1), wherein the first condition comprises at least one of that;

the second-type node fails to successfully decode a Random Access Response (RAR) Msg2;

the second-type node successfully decodes the RAR Msg2, and there is no RAR information, which is intended to be sent to the second-type node, in the decoded RAR Msg2;

a first-type node fails to successfully decode a Msg3;

the first-type node successfully decodes the Msg3, and sends a Msg4 to the second-type node, and the second-type node fails to successfully decode the Msg4; and

the first-type node successfully decodes the Msg3, and sends the Msg4 to the second-type node, the second-type node successfully decodes the Msg4 and finds that the Msg4 is not intended to be sent to the second-type node.

2. The method as claimed in claim 1, wherein when the first condition is that the second-type node fails to successfully decode the RAR Msg2 and the RAR Msg2 is a first-type RAR Msg2, the second-type node resends the random access signaling Msg1 in at least one of the following manners:

a number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is determined by level information of the second-type node;

when the level information of the second-type node does not change, the number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is the same as a number of times for which the random access signaling Msg1 is repeatedly sent during last sending;

a current level of the second-type node is a level i, and when a number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than an upper limit Ni of a number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node resends the random access signaling Msg1 in at least one of the following manners;

the second-type node continues adopting the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to the level i to resend the random access signaling Msg1;

the second-type node increases sending power for resending the random access signaling Msg1; and

sending time indication information for resending of the random access signaling Msg1 by the second-type node is K1;

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than the upper limit Ni of the a number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i and the second-type node cannot increase the sending power of the random access signaling Msg1 any more, the second-type node resends the random access signaling Msg1 in at least one of the following manners;

the second-type node continues adopting the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to the level i to resend the random access signaling Msg1, and the sending time indication information for resending of the random access signaling Msg1 by the second-type node is K2;

when the second-type node is at the current level and the second-type node cannot increase the sending power of the random access signaling Msg1 any more, Ni=1; and

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is greater than or equal to the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node resends the random access signaling Msg1 in at least one of the following manners;

the second-type node adopts a number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to a level next to the level i to resend the random access signaling Msg1, and the sending time indication information for resending of the random access signaling Msg1 by the second-type node is K0,

wherein the sending time indication information for resending of the random access signaling Msg1 refers to a time interval between resending of the random access signaling Msg1 and an ending moment of a detection window of a previous RAR Msg2; and

the first-type RAR Msg2 refers to RAR Msg2 comprising RAR information for the second-type nodes of the same levels.

4. The method as claimed in claim 2, wherein the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i is configured by the first-type node;

and different levels correspond to different values of Ni.

12. The method as claimed in claim 1, wherein when the first condition is that the second-type node fails to successfully decode the RAR Msg2 corresponding to the level of the second-type node, the second-type node fails to successfully decode an RAR Msg2 corresponding to a level higher than the level of the second-type node and the RAR Msg2 is a second-type RAR Msg2, the second-type node resends the random access signaling Msg1 in at least one of the following manners:

the number of times for which the random access signaling is repeatedly sent during a process of resending the random access signaling is determined by information of a new level selected by the second-type node;

the new level is a level next to a highest level corresponding to an RAR Msg2 decoded by the second-type node;

index information of the highest level corresponding to the RAR Msg2 decoded by the second-type node is sent to the second-type node by the first-type node; and

the second-type RAR Msg2 refers to RAR Msg2 comprising RAR information for the second-type nodes of one or more levels.

14. The method as claimed in claim 1, wherein when the first condition is that the first-type node successfully decodes the Msg3 and sends the Msg4 to the second-type node and the second-type node fails to successfully decode the Msg4, the second-type node resends the random access signaling Msg1 in at least one of the following manners:

the number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is determined by the level information of the second-type node;

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i and the second-type node can increase the sending power of the random access signaling Msg1, the sending power of the random access signaling is not increased; and

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is greater than or equal to the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node adopts the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to a level next to the level i to resend the random access signaling Msg1.

15. The method as claimed in claim 14, wherein the second-type node sends at least one of the following information via the Msg3:

indication information indicating the first-type node to increase a number of times for which the Msg4 is repeatedly sent;

information indicating an increment by which the first-type node increases the number of times for which the Msg4 is repeatedly sent; and

the number of times for which the Msg4 is repeatedly sent by the first-type node.

16. The method as claimed in claim 14, wherein the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i is configured by the first-type node;

and different levels correspond to different values of Ni.

17. The method as claimed in claim 1, wherein when the first condition is that the first-type node successfully decodes the Msg3 and sends the Msg4 to the second-type node and the second-type node successfully decodes the Msg4 and finds that the Msg4 is not intended to be sent to the second-type node, the second-type node resends the random access signaling Msg1 in at least one of the following manners:

the number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is determined by the level information of the second-type node;

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i1 and the second-type node can increase the sending power of the random access signaling Msg1, the sending power of the random access signaling is not increased; and

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is greater than or equal to the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node adopts the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to a level next to the level i to resend the random access signaling Msg1.

18. The method as claimed in claim 17, wherein the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i is configured by the first-type node;

and different levels correspond to different values of Ni.

20. The method as claimed in claim 2, wherein the level of the second-type node comprises at least one of:

a Coverage Enhancement Level (CEL);

a Physical Random Access Channel (PRACH) CEL; and

a PRACH repeated sending level.

21. The method as claimed in claim 1, wherein the first-type node is at least one of:

a Macrocell, a Microcell, a Picocell, a Femtocell, a home Evolved Node B (eNB), a Low Power Node (LPN) and a relay,

wherein the second-type node comprises at least one of;

one or more Human to Human (H2H) communication terminals, one or more Machine to Machine (M2M) communication terminals and one or more Device to Device (D2D) communication terminals.

3. (canceled)

5-11. -11. (canceled)

13. (canceled)

19. (canceled)

22. A device for resending random access signaling, comprising:

a processor; and

a memory configured to store instructions executable by the processor,

wherein the processor is configured to;

detect whether a first condition is met or not, wherein the first condition comprises at least one of that;

a second-type node fails to successfully decode a Random Access Response (RAR) Message 2 (Msg2);

the second-type node successfully decodes the RAR Msg2, and there is no RAR information, which is intended to be sent to the second-type node, in the decoded RAR Msg2;

a first-type node fails to successfully decode a Msg3;

the first-type node successfully decodes the Msg3, and sends a Msg4 to the second-type node, and the second-type node fails to successfully decode the Msg4;

the first-type node successfully decodes the Msg3, and sends the Msg4 to the second-type node, the second-type node successfully decodes the Msg4, and finds that the Msg4 is not intended to be sent to the second-type node; and

under the circumstance that the first condition is met, resend, by the second-type node, random access signaling Msg1.

23. The device as claimed in claim 22, wherein when the first condition is that the second-type node fails to successfully decode the RAR Msg2 and the RAR Msg2 is a first-type RAR Msg2, the processor is configured to resend the random access signaling Msg1 in at least one of the following manners:

a number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is determined by level information of the second-type node;

when the level information of the second-type node does not change, the number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is the same as a number of times for which the random access signaling Msg1 is repeatedly sent during last sending;

a current level of the second-type node is a level i, and when a number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than an upper limit Ni of a number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node resends the random access signaling Msg1 in at least one of the following manners;

the second-type node continues adopting the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to the level i to resend the random access signaling Msg1;

the second-type node increases sending power for resending the random access signaling Msg1; and

sending time indication information for resending of the random access signaling Msg1 by the second-type node is K1;

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i and the second-type node cannot increase the sending power of the random access signaling Msg1 any more, the second-type node resends the random access signaling Msg1 in at least one of the following manners;

the second-type node continues adopting the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to the level i to resend the random access signaling Msg1; and

the sending time indication information for resending of the random access signaling Msg1 by the second-type node is K2;

when the second-type node is at the current level and the second-type node cannot increase the sending power of the random access signaling Msg1 any more, Ni=1; and

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is greater than or equal to the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node resends the random access signaling Msg1 in at least one of the following manners;

the second-type node adopts a number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to a level next to the level i to resend the random access signaling Msg1, and the sending time indication information for resending of the random access signaling Msg1 by the second-type node is K0,

wherein the sending time indication information for resending of the random access signaling Msg1 refers to a time interval between resending of the random access signaling Msg1 and an ending moment of a detection window of a previous RAR Msg2; and

the first-type RAR Msg2 refers to RAR Msg2 comprising RAR information for the second-type nodes of the same levels.

25. The device as claimed in claim 23, wherein the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i is configured by the first-type node;

and different levels correspond to different values of Ni.

33. The device as claimed in claim 22, wherein when the first condition is that the second-type node fails to successfully decode the RAR Msg2 corresponding to the level of the second-type node, the second-type node fails to successfully decode an RAR Msg2 corresponding to a level higher than the level of the second-type node and the RAR Msg2 is a second-type RAR Msg2, the processor is configured to resend the random access signaling Msg1 in at least one of the following manners:

the number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is determined by information of a new level selected by the second-type node;

the new level is a level next to a highest level corresponding to an RAR Msg2 decoded by the second-type node;

index information of the highest level corresponding to the RAR Msg2 decoded by the second-type node is sent to the second-type node by the first-type node; and

the second-type RAR Msg2 refers to RAR Msg2 comprising RAR information for the second-type nodes of one or more levels.

35. The device as claimed in claim 22, wherein when the first condition is that the first-type node successfully decodes the Msg3 and sends the Msg4 to the second-type node and the second-type node fails to successfully decode the Msg4, the processor is configured to resend the random access signaling Msg1 in at least one of the following manners:

the number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is determined by the level information of the second-type node;

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i1 and the second-type node can increase the sending power of the random access signaling Msg1, the sending power of the random access signaling is not increased; and

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is greater than or equal to the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node adopts the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to a level next to the level i to resend the random access signaling Msg1.

36. The device as claimed in claim 35, wherein the second-type node sends at least one of the following information via the Msg3:

indication information indicating the first-type node to increase a number of times for which the Msg4 is repeatedly sent;

information indicating an increment by which the first-type node increases the number of times for which the Msg4 is repeatedly sent; and

the number of times for which the Msg4 is repeatedly sent by the first-type node.

37. The device as claimed in claim 35, wherein the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i is configured by the first-type node;

and different levels correspond to different values of Ni.

38. The device as claimed in claim 22, wherein when the first condition is that the first-type node successfully decodes the Msg3 and sends the Msg4 to the second-type node and the second-type node successfully decodes the Msg4 and finds that the Msg4 is not intended to be sent to the second-type node, the processor is configured to resend the random access signaling Msg1 in at least one of the following manners:

the number of times for which the random access signaling Msg1 is repeatedly sent during a process of resending the random access signaling Msg1 is determined by the level information of the second-type node;

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is smaller than the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i and the second-type node can increase the sending power of the random access signaling Msg1, the sending power of the random access signaling is not increased; and

the current level of the second-type node is the level i, and when the number of times for which the second-type node resends the random access signaling Msg1 at the level i is greater than or equal to the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i, the second-type node adopts the number of times for which the random access signaling Msg1 is repeatedly sent and which is corresponding to a level next to the level i to resend the random access signaling Msg1.

39. The device as claimed in claim 38, wherein the upper limit Ni of the number of times for which the random access signaling Msg1 is sent and which is corresponding to the level i is configured by the first-type node, and different levels correspond to different values of Ni.

24. (canceled)

26-32. -32. (canceled)

34. (canceled)

40-42. -42. (canceled)