Random access method, apparatus, and system

• US 10,638,518 B2
• Filed: 04/12/2016
• Issued: 04/28/2020
• Est. Priority Date: 09/21/2015
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Liu, Xu, Dai, Qian, Ai, Jianxun, Zou, Wei
• Primary Examiner(s): Thompson, Jr., Otis L
• Application Number:
  US15/761,793
• Publication Number:
  US 20180288808A1
• Time in Patent Office: 1,477 Days
• Field of Search: None
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

Provided are a random access method, apparatus and system. The method includes: receiving, by a user equipment, configuration information of a Physical Random Access Channel (PRACH) dedicated for a super real-time service and/or configuration information of a preamble dedicated for the super real-time service notified by a base station; and when the user equipment has the super real-time service and has a short Transmission Time Interval (TTI) support capability, by the user equipment, transmitting a preamble to the base station through a PRACH resource dedicated for the super real-time service or transmitting the preamble dedicated for the super real-time service to the base station according to the configuration information of the PRACH dedicated for the super real-time service and/or the configuration information of the preamble dedicated for the super real-time service, so as to trigger the base station to allocate a short TTI resource to the user equipment.

Claims

1. A random access method, comprising:

receiving, by a user equipment, configuration information notified by a base station including;

configuration information of a Physical Random Access Channel (PRACH) dedicated for a super real-time service and/or configuration information of a preamble dedicated for the super real-time service; and

in response to determining that the user equipment includes the super real-time service and includes a short Transmission Time Interval (TTI) support capability, by the user equipment, performing, according to the configuration information of the PRACH dedicated for the super real-time service and/or the configuration information of the preamble dedicated for the super real-time service, at least one of transmitting a preamble to the base station through a PRACH resource dedicated for the super real-time service and transmitting the preamble dedicated for the super real-time service to the base station, so as to trigger the base station to allocate a short TTI resource to the user equipment by a Random Access Response (RAR) carried with resource allocation information for a short TTI;

wherein a resource for transmitting the RAR is determined, according to short TTI support capabilities of all user equipment initiating a random access request, by the base station as follows;

in response to determining that not all of user equipment initiating the random access request at a moment have short TTI support capabilities or in response to determining that no short TTI resource exists in Physical Downlink Shared Channel (PDSCH) resources for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is 1 ms; and

in response to determining that all of the user equipment initiating the random access requests at the moment have the short TTI support capabilities and a short TTI resource exists in the PDSCH resource for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is less than 1 ms.

2. The method according to claim 1, wherein the configuration information of the PRACH dedicated for the super real-time service indicates at least one of:

the PRACH dedicated for the super real-time service and an existing PRACH occupy a same time domain position the TTI of which is 1 ms and occupy different frequency domain resource positions, and a frame structure for the PRACH dedicated for the super real-time service is the TTI of 1 ms;

the PRACH dedicated for the super real-time service and the existing PRACH occupy the same time domain position the TTI of which is 1 ms and occupy different frequency domain resource positions, and the frame structure for the PRACH dedicated for the super real-time service is a short TTI less than 1 ms;

the PRACH dedicated for the super real-time service and the existing PRACH occupy different time domain positions, and the frame structure for the PRACH dedicated for the super real-time service is the TTI of 1 ms; and

the PRACH dedicated for the super real-time service and the existing PRACH occupy different time domain positions, and the frame structure for the PRACH dedicated for the super real-time service is the short TTI less than 1 ms.

3. The method according to claim 1, wherein the configuration information of the preamble dedicated for the super real-time service comprises:

an index of the preamble dedicated for the super real-time service in existing preambles for random access.

4. The method according to claim 1, wherein the super real-time service refers to the following service:

a service indicator of the service indicates that a delay of a data packet is less than 50 ms.

5. A random access method, comprising:

identifying, by a base station, a preamble transmitted from a user equipment;

in response to determining that the base station identifies that the preamble received is at least one of a preamble transmitted from the user equipment through a Physical Random Access Channel (PRACH) resource dedicated for a super real-time service and a preamble dedicated for the super real-time service, transmitting, by the base station, the user equipment a Random Access Response (RAR) carried with resource allocation information for a short Transmission Time Interval (TTI); and

determining, by the base station, a resource for transmitting the RAR according to short TTI support capabilities of all user equipment initiating a random access request after the preamble transmitted from the user equipment is identified by the base station;

wherein determining, by the base station, a resource for transmitting the RAR according to short TTI support capabilities of all user equipment initiating a random access request comprises;

in response to determining that not all of user equipment initiating the random access request a moment have short TTI support capabilities or in response to determining that no short TTI resource exists in Physical Downlink Shared Channel (PDSCH) resources for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is 1 ms; and

in response to determining that all of the user equipment initiating the random access requests at the moment have the short TTI support capabilities and a short TTI resource exists in the PDSCH resource for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is less than 1 ms.

6. The method according to claim 5, wherein the resource allocation information for the short TTI is uplink authorization information for the short TTI carried by a MAC RAR control information unit in a Media Access Control Protocol Data Unit (MAC PDU) of the RAR.

7. A random access apparatus provided in a user equipment, comprising a processor and a storage device storing computer executable instructions that, when executed by the processor, cause the processor to perform the following method:

receiving configuration information notified by a base station, including configuration information of a Physical Random Access Channel (PRACH) dedicated for a super real-time service and/or configuration information of a preamble dedicated for the super real-time service; and

in response to determining that the user equipment includes the super real-time service and includes a short Transmission Time Interval (TTI) support capability, performing, according to the configuration information of the PRACH dedicated for the super real-time service and/or the configuration information of the preamble dedicated for the super real-time service, at lease one of;

transmitting the preamble to the base station through a PRACH resource dedicated for the super real-time service and transmitting the preamble dedicated for the super real-time service to the base station, so as to trigger the base station to allocate a short TTI resource to the user equipment by a Random Access Response (RAR) carried with resource allocation information for a short TTI;

wherein a resource for transmitting the RAR is determined, according to short TTI support capabilities of all user equipment initiating a random access request, by the base station as follows;

in response to determining that not all of user equipment initiating the random access request at a moment have short TTI support capabilities or in response to determining that no short TTI resource exists in Physical Downlink Shared Channel (PDSCH) resources for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is 1 ms; and

in response to determining that all of the user equipment initiating the random access requests at the moment have the short TTI support capabilities and a short TTI resource exists in the PDSCH resource for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is less than 1 ms.

8. The apparatus according to claim 7, wherein the configuration information of the PRACH dedicated for the super real-time service indicates at least one of:

the PRACH dedicated for the super real-time service and an existing PRACH occupy a same time domain position the TTI of which is 1 ms and occupy different frequency domain resource positions, and a frame structure for the PRACH dedicated for the super real-time service is the TTI of 1 ms;

the PRACH dedicated for the super real-time service and the existing PRACH occupy the same time domain position the TTI of which is 1 ms and occupy different frequency domain resource positions, and the frame structure for the PRACH dedicated for the super real-time service is a short TTI less than 1 ms;

the PRACH dedicated for the super real-time service and the existing PRACH occupy different time domain positions, and the frame structure for the PRACH dedicated for the super real-time service is the TTI of 1 ms; and

the PRACH dedicated for the super real-time service and the existing PRACH occupy different time domain positions, and the frame structure for the PRACH dedicated for the super real-time service is the short TTI less than 1 ms.

9. The apparatus according to claim 7, wherein the configuration information of the preamble dedicated for the super real-time service comprises:

an index of the preamble dedicated for the super real-time service in existing preambles for random access.

10. The apparatus according to claim 7, wherein the super real-time service refers to the following service:

a service indicator of the service indicates that a delay of a data packet is of less than 50 ms.

13. A random access system, comprising:

a user equipment provided with a random access apparatus according to claim 7 and a base station.

11. A random access apparatus provided in a base station, comprising a processor and a storage device storing computer executable instructions that, when executed by the processor, cause the processor to perform the steps in following method:

identifying a preamble transmitted from a user equipment;

in response to identifying that the preamble received is at least one of a preamble transmitted from the user equipment through a Physical Random Access Channel (PRACH) resource dedicated for a super real-time service and a preamble dedicated for the super real-time service, transmitting the user equipment a Random Access Response (RAR) carried with resource allocation information for a short Transmission Time Interval (TTI); and

determining a resource for transmitting the RAR according to short TTI support capabilities of all user equipment initiating a random access request after the preamble transmitted from the user equipment is identified;

wherein determining a resource for transmitting the RAR according to short TTI support capabilities of all user equipment initiating a random access request comprises;

in response to determining that not all of user equipment initiating the random access request at a moment have short TTI support capabilities or in response to determining that no short TTI resource exists in Physical Downlink Shared Channel (PDSCH) resources for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is 1 ms; and

in response to determining that all of the user equipment initiating the random access requests at the moment have the short TTI support capabilities and a short TTI resource exists in the PDSCH resource for transmitting the RAR at the moment, transmitting, by the base station, the RAR on a PDSCH resource the TTI of which is less than 1 ms.

12. The apparatus according to claim 11, wherein the resource allocation information for the short TTI is uplink authorization information for the short TTI carried by a MAC RAR control information unit in a Media Access Control Protocol Data Unit (MAC PDU) of the RAR.

14. A random access system, comprising:

a base station provided with a random access apparatus according to claim 11 and a user equipment.