Random access procedure with beamforming in LTE

Patent metadata

Field	Value
Publication number	US-10299275-B2
Application number	US-201314773869-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A method for improved random access procedures by a UE is provided. The method comprises: measuring a common CSI-RS; selecting a best horizontal/vertical beam from a set of fixed beams; determining a preamble mapped to the selected horizontal/vertical beam; transmitting the preamble; and receiving a random access response.

First claim

What is claimed is:

1. A method for improved random access procedures by a user equipment (UE), comprising:
measuring a common channel state information reference signal (CSI-RS);
selecting a horizontal/vertical beam from a set of fixed beams;
determining a preamble mapped to the selected horizontal/vertical beam;
transmitting the preamble; and
receiving a random access response (RAR), wherein the RAR is mapped to a UE-specific search space using an enhanced random access radio network temporary identity (RA-RNTI) based on a sum of factors including an identifier of the selected horizontal/vertical beam, and wherein the RAR is multicast to UEs that report a same horizontal/vertical beam.

2. The method of claim 1 , wherein the preamble is transmitted to an evolved NodeB (eNB) as part of a random access procedure.

3. The method of claim 1 , wherein the mapping of the preamble to the selected horizontal/vertical beam is preconfigured.

4. A method for improved random access procedures by an evolved NodeB (eNB), comprising:
broadcasting a common channel state information reference signal (CSI-RS);
receiving a preamble from a user equipment (UE);
determining a selected horizontal/vertical beam for the UE based on the received preamble;
mapping a physical downlink control channel (PDCCH) grant of a random access response (RAR) to a UE-specific search space using an enhanced random access radio network temporary identity (RA-RNTI) based on a sum of factors including an identifier of the selected horizontal/vertical beam; and
transmitting the RAR to the UE using the selected horizontal/vertical beam, wherein the RAR is multicast to UEs that report a same horizontal/vertical beam.

5. The method of claim 4 , wherein the preamble is received as part of a random access procedure.

6. The method of claim 4 , wherein the mapping of the preamble to the selected horizontal/vertical beam is preconfigured.

7. The method of claim 4 , wherein all preambles are grouped in several groups, wherein each group corresponds to one horizontal/vertical beam.

8. The method of claim 4 , wherein new sets of preambles are defined for each horizontal/vertical beam.

9. A wireless communication device, comprising:
at least one processor configured to:
measure a common channel state information reference signal (CSI-RS),
select a horizontal/vertical beam from a set of fixed beams,
determine a preamble mapped to the selected horizontal/vertical beam,
transmit the preamble, and
receive a random access response (RAR), wherein the RAR is mapped to a UE-specific search space using an enhanced random access radio network temporary identity (RA-RNTI) based on a sum of factors including an identifier of the selected horizontal/vertical beam, and wherein the RAR is multicast to UEs that report a same horizontal/vertical beam; and

a memory coupled to the at least one processor.

10. The wireless communication device of claim 9 , wherein the preamble is transmitted to an evolved NodeB (eNB) as part of a random access procedure.

11. The wireless communication device of claim 9 , wherein the mapping of the preamble to the selected horizontal/vertical beam is preconfigured.

12. A base station, comprising:
at least one processor configured to:
broadcast a common channel state information reference signal (CSI-RS),
receive a preamble from a user equipment (UE),
determine a selected horizontal/vertical beam for the UE based on the received preamble,
map a physical downlink control channel (PDCCH) grant of a random access response (RAR) to a UE-specific search space using an enhanced random access radio network temporary identity (RA-RNTI) based on a sum of factors including an identifier of the selected horizontal/vertical beam, and
transmit the RAR to the UE using the selected horizontal/vertical beam; and

a memory coupled to the at least one processor, wherein the RAR is multicast to UEs that report a same horizontal/vertical beam.

13. The base station of claim 12 , wherein the preamble is received as part of a random access procedure.

14. The base station of claim 12 , wherein the mapping of the preamble to the selected horizontal/vertical beam is preconfigured.

15. The base station of claim 12 , wherein all preambles are grouped in several groups, wherein each group corresponds to one horizontal/vertical beam.

16. The base station of claim 12 , wherein new sets of preambles are defined for each horizontal/vertical beam.

17. An apparatus, comprising:
means for measuring a common channel state information reference signal (CSI-RS);
means for selecting a horizontal/vertical beam from a set of fixed beams;
means for determining a preamble mapped to the selected horizontal/vertical beam;
means for transmitting the preamble; and
means for receiving a random access response (RAR), wherein the RAR is mapped to a UE-specific search space using an enhanced random access radio network temporary identity (RA-RNTI) based on a sum of factors including an identifier of the selected horizontal/vertical beam, and wherein the RAR is multicast to UEs that report a same horizontal/vertical beam.

18. The apparatus of claim 17 , wherein the preamble is transmitted to an evolved NodeB (eNB) as part of a random access procedure.

19. The apparatus of claim 17 , wherein the mapping of the preamble to the selected horizontal/vertical beam is preconfigured.

20. An apparatus, comprising:
means for broadcasting a common channel state information reference signal (CSI-RS);
means for receiving a preamble from a user equipment (UE);
means for determining a selected horizontal/vertical beam for the UE based on the received preamble;
means for mapping a physical downlink control channel (PDCCH) grant of a random access response (RAR) to a UE-specific search space using an enhanced random access radio network temporary identity (RA-RNTI) based on a sum of factors including an identifier of the selected horizontal/vertical beam; and
means for transmitting the RAR to the UE using the selected horizontal/vertical beam, wherein the RAR is multicast to UEs that report a same horizontal/vertical beam.

21. The apparatus of claim 20 , wherein the preamble is received as part of a random access procedure.

22. The apparatus of claim 20 , wherein the mapping of the preamble to the selected horizontal/vertical beam is preconfigured.

23. The apparatus of claim 20 , wherein all preambles are grouped in several groups, wherein each group corresponds to one horizontal/vertical beam.

24. The apparatus of claim 20 , wherein new sets of preambles are defined for each horizontal/vertical beam.

25. A non-transitory tangible computer-readable medium storing computer-executable code, comprising:
code for causing a wireless communication device to measure a common channel state information reference signal (CSI-RS);
code for causing the wireless communication device to select a horizontal/vertical beam from a set of fixed beams;
code for causing the wireless communication device to determine a preamble mapped to the selected horizontal/vertical beam;
code for causing the wireless communication device to transmit the preamble; and
code for causing the wireless communication device to receive a random access response (RAR), wherein the RAR is mapped to a UE-specific search space using an enhanced random access radio network temporary identity (RA-RNTI) based on a sum of facto

Assignees

• Qualcomm Inc

Inventors

• Hou Jilei
• Wang Neng
• Wei Chao

Classifications

• H04W72/046 Primary

  the resource being in the space domain, e.g. beams · CPC title

• H04W74/0833

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

• H04B7/0695

  using beam selection · CPC title

• H04B7/06952

  Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping · CPC title