Uplink reference signal

Patent metadata

Field	Value
Publication number	US-2018123850-A1
Application number	US-201715801177-A
Country	US
Kind code	A1
Filing date	Nov 1, 2017
Priority date	Nov 3, 2016
Publication date	May 3, 2018
Grant date	—

Abstract

Methods and devices for configurable sequence usage for user equipment (UE) uplink reference signaling are provided. In one provided method, a transmission reception point (TRP) in a wireless communication network receives a first UL reference signal (RS) associated with a first UL RS sequence from a first UE and receives a second UL RS associated with a second UL RS sequence from a second UE, the first and second UL RS sequences being non-orthogonal. In another provided method, A UE determines an UL RS sequence based on a UL RS sequence root, the UL RS sequence root being a UE-specific root and being independent of a cell identifier of a cell serving the UE. The UE sends an UL RS associated with the UL RS sequence, the UL RS sequence being a Zadoff-Chu sequence.

First claim

1 . A communication method comprising:
receiving, at a transmission reception point (TRP) in a wireless communication network:
a first uplink (UL) reference signal (RS) associated with a first UL RS sequence from a first user equipment (UE); and
a second UL RS associated with a second UL RS sequence from a second UE, the first and second UL RS sequences being non-orthogonal.

2 . The method of claim 1 , wherein the first UL RS is located in a first time-frequency location and the second UL RS is located in a second time-frequency location different from the first time-frequency location.

3 . The method of claim 1 , wherein the first and second UL RS sequences are generated using first and second UL RS sequence roots, respectively, each root being based in part on a number of UL reference signal sequences that have been assigned.

4 . The method of claim 3 , wherein the first and second UL RS sequence roots are each based in part on a function ƒ UCS according to:

f
UCS

=

l


⌊

n
SRS

n
SRS

cs
,
max

⌋

,

where n SRS is the number of UL RS sequences that have been assigned, n SRS cs,max is the maximum number of cyclic shifts permissible for any one UL RS sequence, and l is an integer.

5 . The method of claim 1 , wherein the first and second UL RS sequences are generated using first and second UL RS sequence roots that are each based in part on a hyper cell identifier (ID) associated with a hyper cell that includes the TRP.

6 . The method of claim 3 , wherein the first and second UL RS sequence roots are from a pool of UL RS sequence roots that includes more than 60 UL RS sequence roots.

7 . The method of claim 1 , wherein at least one of the UL reference signals has a sub-carrier spacing (SCS) that is different than the SCS in a time-frequency location used by an uplink data channel.

8 . The method of claim 1 , wherein the first and second UL RS sequences have low cross-correlation.

9 . A transmission reception point (TRP) for wireless communication, the TRP comprising:
a memory storage comprising instructions; and one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to: receive a first uplink (UL) reference signal (RS) associated with a first UL RS sequence from a first user equipment (UE); and receive a second UL RS associated with a second UL RS sequence from a second UE, the first and second UL RS sequences being non-orthogonal.

10 . The TRP of claim 9 , wherein the first UL RS is located in a first time-frequency location and the second UL RS is located in a second time-frequency location different from the first time-frequency location.

11 . The TRP of claim 9 , wherein the first and second UL RS sequences are generated using first and second UL RS sequence roots, respectively, each root being based in part on a number of UL reference signal sequences that have been assigned.

12 . The TRP of claim 11 , wherein the first and second UL RS sequence roots are each based in part on a function ƒ UCS according to:

f
UCS

=

l


⌊

n
SRS

n
SRS

cs
,
max

⌋

,

where n SRS is the number of UL RS sequences that have been assigned, n SRS cs,max is the maximum number of cyclic shifts permissible for any one UL RS sequence, and l is an integer.

13 . The TRP of claim 9 , wherein the first and second UL RS sequences are generated using first and second UL RS sequence roots that are each based in part on a hyper cell identifier (ID) associated with a hyper cell that includes the TRP.

14 . The TRP of claim 11 , wherein the first and second UL RS sequence roots are from a pool of UL RS sequence roots that includes more than 60 UL RS sequence roots.

15 . The TRP of claim 9 , wherein at least one of the UL reference signals has a sub-carrier spacing (SCS) that is different than the SCS in a time-frequency location used by an uplink data channel.

16 . The TRP of claim 9 , wherein the first and second UL RS sequences have low cross-correlation.

17 . A communication method comprising:
determining, by a user equipment (UE), an uplink (UL) reference signal (RS) sequence based on a UL RS sequence root, the UL RS sequence root being a UE-specific root and being independent of a cell identifier of a cell serving the UE; and sending, by the UE, an UL RS associated with the UL RS sequence, the UL RS sequence being a Zadoff-Chu sequence.

18 . The method of claim 17 , wherein the UL RS sequence root is from a pool of UL RS sequence roots that includes more than 60 UL RS sequence roots.

19 . The method of claim 17 , wherein the UL RS sequence has low cross-correlation with a UL RS sequence for another UE.

20 . The method of claim 17 , further comprising:
sending, by the UE, an UL data signal, the sub-carrier spacing (SCS) of the UL RS being different from the SCS of the UL data signal.

21 . A user equipment (UE) comprising:
a memory storage comprising instructions; and one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to: determine an uplink (UL) reference signal (RS) sequence based on a UL RS sequence root, the UL RS sequence root being a UE-specific root and being independent of a cell identifier of a cell serving the UE; and send an UL RS associated with the UL RS sequence, the UL RS sequence being a Zadoff-Chu sequence.

22 . The UE of claim 17 , wherein the UL RS sequence root is from a pool of UL RS sequence roots that includes more than 60 UL RS sequence roots.

23 . The UE of claim 17 , wherein the UL RS sequence has low cross-correlation with a UL RS sequence for another UE.

24 . The UE of claim 17 , wherein the one or more processors execute the instructions to:
send an UL data signal, the sub-carrier spacing (SCS) of the UL RS being different from the SCS of the UL data signal.

Assignees

• Zarifi Keyvan
• Baligh Mohammadhadi
• Vilaipornsawai Usa
• Huawei Tech Co Ltd

Inventors

• Zarifi Keyvan
• Baligh Mohammadhadi
• Vilaipornsawai Usa

Classifications

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04J13/0062

  Zadoff-Chu · CPC title

• H04W72/0466

  the resource being a scrambling code · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title