US2015016489A1PendingUtilityA1
Antenna Selection with Frequency-Hopped Sounding Reference Signals
Assignee: MITSUBISHI ELECTRIC RES LABPriority: Jun 24, 2008Filed: Sep 30, 2014Published: Jan 15, 2015
Est. expiryJun 24, 2028(~1.9 yrs left)· nominal 20-yr term from priority
H04B 7/0602H04L 5/0023H01Q 25/00H01Q 3/24H04W 88/08H04W 88/02H04W 28/16H04L 5/0053H04L 5/0048H04B 1/713H01Q 1/246H04B 7/0691
50
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Claims
Abstract
The embodiments of the invention provide a method for selecting antennas for data transmission in a wireless communication network including user equipment (UE). The network is assigned a band of frequencies, wherein the band is partitioned into at least one set of subbands of the band according to a sounding reference signal (SRS) bandwidth configuration in a form of a code-tree having a plurality levels and each level is associated with a partition coefficient. The UE is configured to transmit frequency-hopped SRS on the set of subbands using subsets of the set of antennas. First, the method determines if a number of subbands in the set of the subbands is odd or even based on the SRS bandwidth configuration, and selects a particular subset of the antennas according to whether the number is odd or even. Then, the SRS is transmitted from the particular subset of the antennas.
Claims
exact text as granted — not AI-modifiedWe claim:
1 . A method for selecting antennas for data transmission in a wireless communication network including user equipment (UE), wherein the network is assigned a band of frequencies, wherein the band is partitioned into at least one set of subbands of the band according to a sounding reference signal (SRS) bandwidth configuration, wherein the SRS bandwidth configuration is in a form of a code-tree having a plurality levels and each level is associated with a partition coefficient, and wherein the UE includes a set of antennas, and wherein the UE is configured to transmit frequency-hopped SRS on the set of subbands using subsets of the set of antennas, comprising in the UE a processor for performing steps of the method, comprising the steps of:
determining if a number of subbands in the set of the subbands is odd or even based on the SRS bandwidth configuration; selecting a particular subset of the antennas according to whether the number is odd or even; and transmitting the SRS from the particular subset of the antennas to enable antenna selection for data transmission.
2 . The method of claim 1 , wherein the determining further comprising:
selecting partition coefficients based on the SRS bandwidth configuration; and multiplying the partition coefficients to produce a product of the partition coefficients, such that the product equals the number of subbands.
3 . The method of claim 1 , wherein the number of subbands is odd, and wherein the selecting further comprising:
determining an index parameter a(nSRS) of the particular subset of antennas according to
a ( n SRS )= n SRS mod2,
wherein nSRS is an index of a transmission of the SRS.
4 . The method of claim 1 , wherein the number of subbands is even, and wherein the selecting further comprising:
determining an index parameter a(nSRS) of the particular subset of antennas according to
a
(
n
SRS
)
=
(
n
SRS
+
[
n
SRS
∏
b
=
0
b
N
b
]
mod
2
)
mod
2
,
wherein nSRS is an index of a transmission of the SRS, b is a level of the segments in a code-tree based SRS allocation, and Nb is a partitioning coefficient of the b level segments.
5 . The method of claim 1 , wherein the number of subbands is odd, and a number of subsets in the set of antennas is even, the selecting further comprising:
determining an index parameter a(nSRS) of the particular subset of antennas according to
a ( nSRS )= nSRS mod xa,
wherein nSRS is an index of the transmission of the SRS, and xa is the number of subsets in the set of the antennas.
6 . The method of claim 1 , wherein the number of subbands is even, and a number of subsets in the set of antennas is odd, the selecting further comprising:
determining an index parameter a(nSRS) of the particular subset of antennas according to
a ( nSRS )= nSRS mod xa,
wherein nSRS is an index of the transmission of the SRS, and xa is the number of subsets in the set of the antennas.
7 . The method of claim 1 , further comprising:
receiving the SRS bandwidth configuration from a base station.
8 . The method of claim 1 , further comprising:
receiving an index of the SRS bandwidth configuration from a base station; and selecting the SRS bandwidth configuration based on the index.
9 . The method of claim 1 , wherein the transmitting is associated with an index nSRS of a transmission of the SRS.
10 . The method of claim 1 , wherein the SRS bandwidth configuration is determined in part by SRS bandwidths and by SRS hopping bandwidths.
11 . The method of claim 1 , wherein the selecting further comprising:
determining an index parameter a(nSRS) of the optimal subset of antennas according to
a ( n SRS )= n SRS mod2,
wherein nSRS is an index of a transmission of the SRS.
13 . A wireless communication network, wherein the network is assigned a band of frequencies, wherein the band is partitioned in at least one set of subbands of the band according to a sounding reference signal (SRS) bandwidth configuration, wherein the SRS bandwidth configuration is in a form of a code-tree having a plurality levels, and each level is associated with a partition coefficient, the network comprising:
user equipment (UE), wherein the UE includes a set of antennas, and wherein the UE is configured to transmit a frequency-hopped SRS over the set of subbands using subsets of the set of antennas, and wherein the UE is configured to select a particular subset of the set of antennas based on whether a number of subbands in the set of the subbands is odd or even, wherein the number of the subbands is defined by the SRS bandwidth configuration.
14 . The network of claim 13 , wherein the SRS bandwidth configuration determines partition coefficients, such that a product of the partition coefficients equals the number of subbands, and wherein the UE is configured to multiply the partition coefficients.
15 . The network of claim 13 , wherein the UE further comprising:
a memory for storing the SRS bandwidth configuration, wherein the SRS bandwidth configuration is identified by an index; and means for receiving the index from the base station.
16 . The network of claim 13 , wherein the UE is further configured to determine an index parameter a(nSRS) of the particular subset of antennas according to a(n SRS )=n SRS mod2, wherein nSRS is an index of a transmission of the SRS.
18 . A user equipment (UE), comprising:
a set of antennas, wherein the UE is configured to transmit frequency-hopped sounding reference signal (SRS) using subsets of the set of antennas according to a SRS bandwidth configuration; means for determining a number of subbands in the set of the subbands is odd or even, wherein the numbers of the subbands equals to a product of partition coefficients defined by the SRS bandwidth configuration; means for selecting a particular subset of antennas based on the number of subbands; and means for transmitting the SRS from the particular subsets of the antennas to select an optimal subset of antennas for data transmission.
19 . The UE of claim 18 , further comprising:
means for determining an index parameter a(nSRS) of the optimal subset of antennas according to
a ( n SRS )= n SRS mod2,
wherein nSRS is an index of a transmission of the SRS.
20 . The UE of claim 18 , further comprising:
means for determining an index parameter a(nSRS) of the optimal subset of antennas according to
a ( nSRS )= nSRS mod xa,
wherein nSRS is an index of the transmission of the SRS, and xa is a number of subsets in the set of the antennas.Cited by (0)
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