Random access procedure(s) for radio system

Patent metadata

Field	Value
Publication number	US-2018317263-A1
Application number	US-201815963423-A
Country	US
Kind code	A1
Filing date	Apr 26, 2018
Priority date	Apr 28, 2017
Publication date	Nov 1, 2018
Grant date	—

Abstract

In one of its aspects the technology disclosed herein concerns a communications system comprising an access node ( 22 ) and a wireless terminal ( 26 ). The wireless terminal comprises receiver circuitry ( 40 ) and transmitter circuitry ( 44 ) as well as processor circuitry ( 40 ). The receiver circuitry ( 40 ) is configured receiver circuitry configured to receive from a base station apparatus configuration parameters for a random access procedure. The configuration parameters include a set of random access preambles and physical random access channel (PRACH) resources reserved for a request of system information. The processor circuitry ( 40 ) is configured to select a random access preamble and PRACH resource from the set of random access preambles and the PRACH resources in a case of requesting the system information. The transmitter circuitry ( 44 ) is configured to transmit the random access preamble using the PRACH resource.

First claim

What is claimed is:

1 . A user equipment comprising:
receiver circuitry configured to receive from a base station apparatus configuration parameters for a random access procedure, wherein the configuration parameters include a set of random access preambles and physical random access channel (PRACH) resources reserved for a request of system information; processor circuitry configured to select a random access preamble and PRACH resource from the set of random access preambles and the PRACH resources in a case of requesting the system information; and transmitter circuitry configured to transmit the random access preamble using the PRACH resource.

2 . The user equipment of claim 1 , wherein the request of system information requests from the base station apparatus an on-demand delivery of a system information block (SIB) or a group of SIBs.

3 . The user equipment of claim 2 , wherein the configuration parameters comprise a list of information elements, each information element comprising identification(s) of the SIBs or the group of SIBs.

4 . The user equipment of claim 3 , wherein the information element further comprises one or more random access preambles, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

5 . The user equipment of claim 3 , wherein the information element further comprises one or more PRACH resources, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

6 . A base station apparatus comprising:
receiver circuitry and transmitter circuitry configured to communicate across a radio interface with a user equipment; processor circuitry configured to:
broadcast configuration parameters for a random access procedure, wherein the configuration parameters include a set of random access preambles and physical random access channel (PRACH) resources reserved for a request of system information;
receive a preamble sequence associated with one of the random access preambles on one of the PRACH resources;
identify and process a request of system information from the user equipment.

7 . The base station apparatus of claim 6 , wherein the request of system information requests from the base station apparatus an on-demand delivery of a system information block (SIB) or a group of SIBs.

8 . The base station apparatus of claim 7 , wherein the configuration parameters comprise a list of information elements, each information element comprising identification(s) of the SIBs or the group of SIBs.

9 . The base station apparatus of claim 8 , wherein the information element further comprises one or more random access preambles, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

10 . The base station apparatus of claim 8 , wherein the information element further comprises one or more PRACH resources, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

11 . A method for a user equipment comprising:
receiving, from a base station apparatus, configuration parameters for a random access procedure, wherein the configuration parameters include a set of random access preambles and PRACH resources reserved for a request of system information, selecting a random access preamble and physical random access channel (PRACH) resource from the set of random access preambles and the PRACH resources in a case of requesting the system information; and transmitting the random access preamble using the PRACH resource.

12 . The method of claim 11 , wherein the request of system information requests from the base station apparatus an on-demand delivery of a system information block (SIB) or a group of SIBs.

13 . The method of claim 12 , wherein the configuration parameters comprise a list of information elements, each information element comprising identification(s) of the SIBs or the group of SIBs.

14 . The method of claim 13 , wherein the information element further comprises one or more random access preamble indices, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

15 . The method of claim 13 , wherein the information element further comprises one or more PRACH resources, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

16 . A method for a base station apparatus comprising:
using receiver circuitry and transmitter circuitry to communicate across a radio interface with a user equipment; using processor circuitry to:
broadcast configuration parameters for a random access procedure, wherein the configuration parameters include a set of random access preambles and physical random access channel (PRACH) resources reserved for a request of system information;
receive a preamble sequence associated with one of the random access preambles on one of the PRACH resources;
identify and process a request of system information from the user equipment.

17 . The method of claim 16 , wherein the request of system information requests from the base station apparatus an on-demand delivery of a system information block (SIB) or a group of SIBs.

18 . The method of claim 17 , wherein the configuration parameters comprise a list of information elements, each information element comprising identification(s) of the SIBs or the group of SIBs.

19 . The method of claim 18 , wherein the information element further comprises one or more random access preambles, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

20 . The method of claim 18 , wherein the information element further comprises one or more PRACH resources, one of which is selected for the request of the SIB or the group of SIBs indicated in the information element.

Assignees

• Sharp Laboratories America Inc

Inventors

• Ishii Atsushi

Classifications

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W48/14

  using user query {or user detection} · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04W72/02 Primary

  Selection of wireless resources by user or terminal · CPC title

• H04W72/12

  Wireless traffic scheduling · CPC title