Random access channel structure design

1. A wireless communication method, comprising:

communicating, by a first device, a channel structure to a second device,

wherein the channel structure includes a first set of resources reserved for a first message, a second set of resources reserved for a second message, or a time duration gap between the first set of resources and the second set of resources, and

wherein the second message is comprised of a first part and a second part,

wherein a subset of the second set of resources reserved for the first part of the second message are adjacent to the first set of resources reserved for the first message, and

wherein the first device releases resources corresponding to the second part from the second set of resources in response to determining an absence of a reception of the first message at the first set of resources or the first part of the second message at the subset of the second set of resources.

2. The method of claim 1 , wherein the time duration gap is calculated based on the first set of resources and the second set of resources.

3. The method of claim 2 , wherein the time duration gap is determined by or is calculated by the first device based on a difference in time domain between a first symbol of the first message and a first symbol of the second message.

4. The method of claim 1 , further comprising:

releasing, by the first device, the second set of resources for the second message in response to determining an absence of a reception of the first message at the first set of resources.

5. The method of claim 1 ,

wherein the first message is selected from a number of sequences for the second device, and

wherein the first device releases the second set of resources for the second message in response to determining an absence of a reception of one or more of the number of sequences at the first set of resources.

6. The method of claim 1 , further comprising:

estimating, by the first device, a time offset for reception of the second message, and

transmitting, within the time duration gap, a message to the second device, wherein the message indicates a timing advance value indicative of the time offset.

7. The method of claim 1 , further comprising:

transmitting, within the time duration gap, a message to the second device, wherein the message indicates a power control value indicative of a power offset, or transmitting, within the time duration gap, another message to the second device, wherein the another message indicates an allocated resource for the second message.

8. A wireless communication method, comprising:

receiving, by a second device, a channel structure from a first device,

wherein the channel structure includes a first set of resources reserved for a first message, a second set of resources reserved for a second message, or a time duration gap between the first set of resources and the second set of resources, and

wherein the second message is comprised of a first part and a second part,

wherein a subset of the second set of resources reserved for the first part of the second message are adjacent to the first set of resources reserved for the first message, and

wherein resources corresponding to the second part from the second set of resources is released in response to an absence of a transmission of the first message at the first set of resources or the first part of the second message at the subset of the second set of resources.

9. The method of claim 8 , wherein the time duration gap is calculated based on the first set of resources and the second set of resources.

10. The method of claim 9 , wherein the time duration gap is calculated by the second device based on a difference in time domain between a first symbol of the first message and a first symbol of the second message.

11. The method of claim 8 , further comprising:

receiving a message by the second device within the time duration gap, wherein the message indicates a timing advance value indicative of a time offset, wherein the second device adjusts a timing for transmitting the second message based on the timing advance value.

12. The method of claim 8 , further comprising:

receiving a message by the second device within the time duration gap, wherein the message indicates a power control value indicative of a power offset, wherein the second device adjusts a transmission power for transmitting the second message based on the power control value, or

receiving another message by the second device within the time duration gap, wherein the another message indicates an allocated resource for the second message, wherein the second device transmit the second message on the allocated resource.

13. An apparatus for wireless communication comprising a processor, configured to implement a method to:

communicate, by a first device, a channel structure to a second device,

wherein the channel structure includes a first set of resources reserved for a first message, a second set of resources reserved for a second message, or a time duration gap between the first set of resources and the second set of resources, and

wherein the second message is comprised of a first part and a second part,

wherein a subset of the second set of resources reserved for the first part of the second message are adjacent to the first set of resources reserved for the first message, and

wherein the first device releases resources corresponding to the second part from the second set of resources in response to determining an absence of a reception of the first message at the first set of resources or the first part of the second message at the subset of the second set of resources.

14. The apparatus of claim 13 , wherein the time duration gap is calculated based on the first set of resources and the second set of resources.

15. The apparatus of claim 14 , wherein the time duration gap is determined by or is calculated by the first device based on a difference in time domain between a first symbol of the first message and a first symbol of the second message.

16. The apparatus of claim 13 , wherein the processor is further configured to:

release, by the first device, the second set of resources for the second message in response to a determination of an absence of a reception of the first message at the first set of resources.

17. The apparatus of claim 13 , wherein the processor is further configured to:

estimate, by the first device, a time offset for reception of the second message, and

transmit, within the time duration gap, a message to the second device, wherein the message indicates a timing advance value indicative of the time offset.

18. An apparatus for wireless communication comprising a processor, configured to implement a method to:

receive, by a second device, a channel structure from a first device,

wherein the channel structure includes a first set of resources reserved for a first message, a second set of resources reserved for a second message, or a time duration gap between the first set of resources and the second set of resources, and

wherein the second message is comprised of a first part and a second part,

wherein a subset of the second set of resources reserved for the first part of the second message are adjacent to the first set of resources reserved for the first message, and

wherein resources corresponding to the second part from the second set of resources is released in response to an absence of a transmission of the first message at the first set of resources or the first part of the second message at the subset of the second set of resources.

19. The apparatus of claim 18 , wherein the time duration gap is calculated based on the first set of resources and the second set of resources.

20. The apparatus of claim 19 , wherein the time duration gap is calculated by the second device based on a difference in time domain between a first symbol of the first message and a first symbol of the second message.