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US 8,897,702 B2Granted
Mobility measurement using CSI-RS in additional carrier
AssigneeIntel Corporation
InventorsHuaning Niu, Jong-Kae Fwu, Yuan Zhu, Xiaogang Chen
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Abstract
A system and a method for a mobility measurement in a wireless network comprises determining at a wireless terminal a channel power estimation ES for a carrier signal based on Channel State Information Reference Signals (CSI-RS), and determining at the wireless terminal a noise plus interference I+N for the carrier signal based on a muted CSI-RS. The carrier signal is an additional carrier without the presence of a Cell-specific Reference Signal. In one exemplary embodiment, the periodicity of the CSI-RS is selected to be 1, 2 or 3 subframes.
Claims30
A wireless terminal, comprising:
- a receiver coupled to one or more antennas;
- and
- a processor coupled to the receiver, the processor being configured to:
- determine a channel power estimation Es for a carrier signal based on Channel State Information Reference Signals (CSI-RS) received by the receiver, the carrier signal being an additional carrier without the presence of a Cell-specific Reference Signal transmitted in a wireless network by a node providing wireless access to the wireless network, wherein the channel power estimation is determined by averaging a channel power from the one or more antennas, by using random precoding, or by using a subset of CSI-RS ports, or combinations thereof,
- determine a noise plus interference I+N for the carrier signal based on a muted CSI-RS, and
- calculate a Reference Signal Received Power (RSRP) measurement or a Reference Signal Received Quality (RSRQ) measurement, or a combination thereof, based at least in part on the channel power estimation and the noise plus interference.
3 more elements
A mobility measurement method in a wireless network, the method comprising:
- determining at a wireless terminal a channel power estimation Es for a carrier signal based on Channel State Information Reference Signals (CSI-RS), the carrier signal being an additional carrier without the presence of a Cell-specific Reference Signal, wherein the channel power estimation is determined by averaging a channel power from one or more antennas, by using random precoding, or by using a subset of CSI-RS ports, or combinations thereof;
- determining at the wireless terminal a noise plus interference I+N for the carrier signal based on a muted CSI-RS having a minimum periodicity less than 5 subframes;
- and
- calculating a Reference Signal Received Power (RSRP) measurement or a Reference Signal Received Quality (RSRQ) measurement, or a combination thereof, based at least in part on the channel power estimation and the noise plus interference.
1 more element
A wireless terminal, comprising:
- a receiver capable of determining a channel power estimation Es for a carrier signal based on Channel State Information Reference Signals (CSI-RS), wherein the channel power estimation is determined by averaging a channel power from one or more antennas, by using random precoding, or by using a subset of CSI-RS ports, or combinations thereof, the carrier signal being an additional carrier without the presence of a Cell-specific Reference Signal transmitted in a wireless network by a node providing wireless access to the wireless network, capable of determining at the mobile station a noise plus interference I+N for the carrier signal based on a muted CSI-RS having a periodicity of the CSI-RS is 1, 2 or 3 subframes, and capable of calculating a Reference Signal Received Power (RSRP) measurement or a Reference Signal Received Quality (RSRQ) measurement, or a combination thereof, based at least in part on the channel power estimation and the noise plus interference;
- and
- a transmitter capable of transmitting to the node providing wireless access to the wireless network the determined channel power estimation Es and the determined noise plus interference I+N .
An article comprising:
- a non-transitory computer-readable medium having stored thereon instructions that, if executed, result in at least the following:
- determining at a wireless terminal a channel power estimation Es for a carrier signal based on Channel State Information Reference Signals (CSI-RS), the carrier signal being an additional carrier in a wireless network without the presence of a Cell-specific Reference Signal,
- the signal power estimation Es being determined as
- E
- S
- =
- 1
- N
-
- ∑
- i
- =
- 1
- N
- r
-
-
- ∑
- j
- =
- 1
- N
- t
-
-
-
- H
- i
- ,
- j
-
- 2
- in which N is the number of resource blocks (RBs) of the E-UTRA carrier RSSI measurement bandwidth, H is the channel response between jth transmit antenna and ith receive antenna, Nr is the total number of receive antennas at UE, Nt is the total number of transmit antennas at a node providing wireless access to the wireless network, i is the receive antenna index, and j is the transmit antenna index,
- or
- E
- S
- =
- ∑
- i
- =
- i
- N
- r
-
-
- H
- i
-
- V
-
- 2
- ;
- in which Hi is the column vector corresponding to each receive antenna, V is the Nt×1 random precoder and i is the receive antenna index;
- and
- determining at the wireless terminal a noise plus interference I+N for the carrier signal based on a muted CSI-RS, wherein the noise plus interference I+N for the carrier signal based on the muted CSI-RS is determined as
- I
- +
- N
- =
- 1
- N
- r
-
- x
-
-
- N
- t
-
- ∑
- i
- =
- 1
- N
- r
-
-
- ∑
- j
- =
- 1
- N
- t
-
-
-
- H
- i
- ,
- j
-
- 2
- in which Nt is the number of muted CSI-RS ports, Nr is the receive antenna number, Hi,j is the estimated channel, and i and j are indices;
- and
- wherein a periodicity of the CSI-RS comprises 1, 2 or 3 subframes.
92 more elements
Dependencies are inferred from the claim text.