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ERICSSON AB

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Patent Application Titled “Systems And Methods For Configuring Measurement Gaps And Sounding Reference Signal Switching” Published Online (USPTO 20190229868): Telefonaktiebolaget LM Ericsson (publ)

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08/14/2019 | 05:50pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Network Business Daily -- According to news reporting originating from Washington, D.C., by NewsRx journalists, a patent application by the inventor Siomina, Iana (TABY, SE), filed on September 29, 2017, was made available online on July 25, 2019.

The assignee for this patent application is Telefonaktiebolaget LM Ericsson (publ) (Stockholm, Sweden).

Reporters obtained the following quote from the background information supplied by the inventors: “Sounding reference signals (SRS) are known signals that are transmitted by wireless devices, which may include user equipments (UEs), so that the network node, which may include an eNodeB, can estimate different uplink-channel properties. These estimates may be used for uplink scheduling and link adaptation but also for downlink multiple antenna transmission, especially in case of time-division duplexing (TDD) where the uplink (UL) and downlink (DL) use the same frequencies. FIG. 1 illustrates an uplink transmission subframe of SRS having a time duration of a single OFDM symbol.

“SRS can be transmitted in the last symbol of a 1 ms uplink subframe, and for the case with TDD, the SRS can also be transmitted in the special slot Uplink Pilot Time Slot (UpPTS). The length of UpPTS can be configured to be one or two symbols. FIG. 2 illustrates an example for TDD. More specifically, FIG. 2 illustrates an example for TDD with 3DL:2UL within a 10 ms radio frame. Up to eight symbols may be set aside for SRS.

“The configuration of SRS symbols, such as SRS bandwidth, SRS frequency domain position, SRS hopping pattern and SRS subframe configuration are set semi-statically as a part of radio resource control (RRC) information element.

“There are two types of SRS transmissions in LTE UL. They are periodic and aperiodic SRS transmission. Periodic SRS is transmitted at regular time instances as configured by means of RRC signaling. Aperiodic SRS is one shot transmission that is triggered by signaling in Physical Data Control Channel (PDCCH).

“There are also two different configurations related to SRS. The first configuration is cell specific SRS configuration, which indicates what subframes may be used for SRS transmissions within the cell. FIG. 2 illustrates an example cell specific SRS configuration.

“The second configuration related to SRS is wireless device specific configuration. The wireless device specific configuration indicates to the terminal a pattern of subframes (among the subframes reserved for SRS transmission within the cell) and frequency domain resources to be used for SRS transmission of that specific wireless device. It also includes other parameters that the wireless device shall use when transmitting the signal, such as frequency domain comb and cyclic shift. This means that sounding reference signals from different wireless devices can be multiplexed in the time domain, by using UE-specific configurations such that the SRS of the two wireless devices are transmitted in different subframes.

“Furthermore, within the same symbol, sounding reference signals can be multiplexed in the frequency domain. The set of subcarriers may be divided into two sets of subcarriers or combinations with the even and odd subcarriers, respectively, in each such set. Additionally, wireless devices may have different bandwidths to get additional frequency domain multiplexing (FDM). The combination enables FDM of signals with different bandwidths and also overlapping bandwidths. Additionally, code division multiplexing can be used. Then different users can use exactly the same time and frequency domain resources by using different shifts of a basic base sequence.

“In LTE networks, there are many kinds of downlink heavier traffic, which leads to more number of aggregated downlink component carriers (CC) than the number of aggregated uplink CCs. For the existing wireless device categories, the typical carrier aggregation (CA) capable wireless devices only support one or two uplink CCs.

“For the carrier supporting both uplink and downlink, transmit diversity based feedback without precoding matrix indicators (PMI) and with SRS is beneficial as channel reciprocity can be used. However, the wireless device generally has the capability of aggregating larger number of DL carriers than that in the UL. As a result, some of TDD carriers with DL transmission for the wireless device will have no UL transmission including SRS, and channel reciprocity cannot be utilized for these carriers. Such situations will become more severe with CA enhancement of up to 32 CCs where a large portion of CCs are TDD. Allowing fast carrier switching to and between TDD UL carriers can be a solution to allow SRS transmission on these TDD carriers and should be supported.

“To enable inter-frequency and inter-Radio Access Technology (inter-RAT) measurements in RRC connected state in E-UTRAN and UTRAN the network may configure the measurement gaps which provide some time for the wireless device to switch reception frequency, make the radio measurement, and switch back to the serving frequency. During measurements gaps, the wireless device is not able to receive or transmit on the serving carrier frequency.

“Two periodic measurement gap patterns both with a measurement gap length of 6 ms are defined for LTE in TS 36.133 v 13.3.0. The first is a measurement gap pattern #0 with a period of 40 ms. The second is measurement gap pattern #1 with a period of 80 ms.

“The measurement gaps are configured by means of MeasGapConfig in RRC signaling, which contains the release command and the gap offset (0.39 or 0.79, respectively). Each gap starts at a frame with a system frame number (SFN) and a subframe with an index meeting the following condition: SFN mod T=FLOOR (gapOffset/10), subframe=gapOffset mod 10, with T=MGRP/10, and MGRP is 40 or 80.

“In addition to network-configured measurement gaps, the wireless device may also use autonomous gaps for, for example, reading system information, acquiring CGI, and performing other operations.

“Additional measurement gap patterns of shorter measurement gap lengths, such as, for example, 2 ms, 3 ms, 4 ms, and other lengths have also been studied and captured in TR 36.984v 13.0.0. Likewise, gap patterns with longer periodicities such as, for example, 80 ms, have also been studied and captured in TR 36.984 v 13.0.0. These measurement gaps may be interchangeably called small gaps, shorter gaps, gaps for synchronous operation, or another suitable term. FIG. 3 illustrates example parameters related to measurement gap pattern.

“At least two problems can be envisioned with SRS switching and measurements gaps used in parallel. First, measurements gaps may block SRS transmissions. Second, wireless device behavior is undefined in case the wireless device is configured with SRS transmissions and needs to perform an operation requiring measurement gaps.”

In addition to obtaining background information on this patent application, NewsRx editors also obtained the inventor’s summary information for this patent application: “To address the foregoing problems with existing solutions, disclosed are systems and methods for configuring measurement gaps and sounding reference signal (SRS) switching.

“According to certain embodiments, a method for configuring measurement gaps and SRS switching is implemented in a wireless device. The method includes obtaining a first configuration for transmitting at least one first radio signal subject to SRS switching. A second configuration indicating a measurement gap for receiving at least one second radio signal is obtained. The first configuration is adapted for transmitting the at least one first radio signal subject to SRS switching while applying the second configuration. The at least one first radio signal subject to SRS switching is transmitted in accordance with the adapted first configuration while applying the second configuration.

“According to certain embodiments, a wireless device for configuring measurement gaps and SRS switching is provided. The wireless device may include memory storing instructions and a processor operable to execute the instructions to cause the processor to obtain a first configuration for transmitting at least one first radio signal subject to SRS switching and obtain a second configuration indicating a measurement gap for receiving at least one second radio signal. The first configuration is adapted for transmitting the at least one first radio signal subject to SRS switching while applying the second configuration. The at least one first radio signal subject to SRS switching is transmitted in accordance with the adapted first configuration while applying the second configuration.

“According to certain embodiments, a method by a network node for configuring measurement gaps and SRS switching is provided. The method may include obtaining a first configuration associated with a transmission of at least one first radio signal subject to SRS switching by a wireless device. A second configuration indicating a measurement gap for receiving at least one second radio signal by the wireless device is obtained. The first configuration is adapted for the transmission by the wireless device of the at least one first radio signal subject to SRS switching while applying the second configuration. The adapted first configuration is transmitted to the wireless device.

“According to certain embodiments, a network node for configuring measurement gaps and SRS switching is provided. The network node may include memory storing instructions and a processor operable to execute the instructions to cause the processor to obtain a first configuration associated with a transmission of at least one first radio signal subject to SRS switching by a wireless device. A second configuration indicating a measurement gap for receiving at least one second radio signal by the wireless device is obtained. The first configuration is adapted for the transmission by the wireless device of the at least one first radio signal subject to SRS switching while applying the second configuration. The adapted first configuration is transmitted to the wireless device.

“Certain embodiments of the present disclosure may provide one or more technical advantages. For example, certain embodiments may ensure the performance of inter-frequency and inter-RAT measurements when SRS switching is configured. Another technical advantage may be that certain embodiments ensure that the performance of SRS switching when measurement gaps are used. Still another technical advantage may be well-defined wireless device behavior in case the wireless device is using measurement gaps and configured with SRS switching.

“Other advantages may be readily apparent to one having skill in the art. Certain embodiments may have none, some, or all of the recited advantages.”

The claims supplied by the inventors are:

“1. A method implemented in a wireless device (110A-C) for configuring measurement gaps and sounding reference signal (SRS) switching, comprising: obtaining a first configuration for transmitting at least one first radio signal subject to SRS switching; wherein the first configuration comprises SRS transmission configuration related to the SRS switching among carriers and/or antennas, the first radio signal is a random-access channel, RACH, SRS signal; obtaining a second configuration indicating a measurement gap for receiving at least one second radio signal; adapting the first configuration for transmitting the at least one first radio signal subject to SRS switching while applying the second configuration; and transmitting the at least one first radio signal subject to SRS switching in accordance with the adapted first configuration while applying the second configuration.

“2. The method of claim 1, wherein the adapted first configuration changes a periodicity for switching between carriers to avoid or reduce an overlap with the measurement gap of the second configuration.

“3. The method of claim 1, further comprising performing a determination that one or more measurement requirements will be met while the wireless device performs measurements associated with the at least one second signal according to the second configuration and transmits the at least one first signal according to the adapted first configuration.

“4. The method of claim 3, wherein: the at least one first signal is transmitted, according to the adapted first configuration, on a first carrier during the measurement gap without adversely affecting the performance of a measurement based on the at least one second signal received on the first carrier during the measurement gap according to the second configuration.

“5. The method of claim 1, wherein the adapted first configuration identifies at least one of: a percentage of SRS transmissions allowed for transmission by the wireless device; a percentage of SRS transmissions to be dropped by the wireless device; a number of SRS transmissions allowed for transmission by the wireless device; and a number of SRS transmissions to be dropped by the wireless device.

“6. The method of claim 1, wherein the adapted first configuration identifies at least one of: a time resource for transmitting the at least one first signal to reduce an overlap with the measurement gap; a time resource for transmitting the at least one first signal that does not occur during the measurement gap; and a time resource for not transmitting the at least one first signal to avoid or reduce an overlap with the measurement gap.

“7. The method of claim 1, wherein adapting the first configuration comprises: obtaining at least one performance characteristic, requirement, or target; and adapting the first configuration in accordance with said at least one performance characteristic, requirement, or target.

“8. The method of claim 1, further comprising: transmitting the adapted first configuration to a network node or another wireless device.

“9. The method of claim 1, further comprising: receiving the adapted first configuration from a network node.

“10. A wireless device for configuring measurement gaps and sounding reference signal (SRS) switching, the wireless device comprising: a memory storing instructions; and a processor operable to execute the instructions to cause the wireless device to: obtain a first configuration for transmitting at least one first radio signal subject to SRS switching; wherein the first configuration comprises SRS transmission configuration related to the SRS switching among carriers and/or antennas, the first radio signal is a random-access channel, RACH, SRS signal; obtain a second configuration indicating a measurement gap for receiving at least one second radio signal; adapt the first configuration for transmitting the at least one first radio signal subject to SRS switching while applying the second configuration; and transmit the at least one first radio signal subject to SRS switching in accordance with the adapted first configuration while applying the second configuration.

“11. The wireless device of claim 10, wherein the adapted first configuration changes a periodicity for switching between carriers to avoid or reduce an overlap with the measurement gap of the second configuration.

“12. The wireless device of claim 10, wherein processor is further executed to cause the wireless device to perform a first determination that one or more measurement requirements will be met while the wireless device performs measurements associated with the at least one second signal according to the second configurator and transmits the at least one first signal according to the adapted first configuration.

“13. The wireless device of claim 10, wherein the adapted first configuration identifies at least one of: a percentage of SRS transmissions allowed for transmission by the wireless device; a percentage of SRS transmissions to be dropped by the wireless device; a number of SRS transmissions allowed for transmission by the wireless device; a number of SRS transmissions to be dropped by the wireless device; a time resource for transmitting the at least one first signal to reduce an overlap with the measurement gap; a time resource for transmitting the at least one first signal that does not occur during the measurement gap; and a time resource for not transmitting the at least one first signal to avoid or reduce an overlap with the measurement gap.

“14. The wireless device of any claim 10, wherein the processor is further executed to cause the wireless device to transmit the adapted first configuration to a network node or another wireless device.

“15. A method implemented in a network node for configuring measurement gaps and sounding reference signal (SRS) switching, comprising: obtaining a first configuration associated with a transmission of at least one first radio signal subject to SRS switching by a wireless device, wherein the first configuration comprises SRS transmission configuration related to the SRS switching among carriers and/or antennas, the first radio signal is a random-access channel, RACH, SRS signal; obtaining a second configuration indicating a measurement gap for receiving at least one second radio signal by the wireless device; adapting the first configuration for the transmission by the wireless device of the at least one first radio signal subject to SRS switching while applying the second configuration; and transmitting the adapted first configuration to the wireless device.

“16. The method of claim 15, wherein the adapted first configuration changes a periodicity for switching between carriers to avoid or reduce an overlap with the measurement gap of the second configuration.

“17. The method of claim 15, further comprising: performing a determination that the wireless device is able to meet one or more measurement requirements while the wireless device performs measurements associated with the at least one second signal according to the second configuration and transmits the at least one first signal according to the adapted first configuration.

“18. The method of claim 17, wherein: the least one first signal may be transmitted by the wireless device, according to the adapted first configuration, on a first carrier during the measurement gap without adversely affecting the performance of a measurement based on the at least one second signal received, according to the second configuration, on the first carrier during the measurement gap.

“19. The method of claim 15, wherein the adapted first configuration identifies at least one of: a percentage of SRS transmissions allowed for transmission by the wireless device; a percentage of SRS transmissions to be dropped by the wireless device; a number of SRS transmissions allowed for transmission by the wireless device; and a number of SRS transmissions to be dropped by the wireless device.

“20. The method of claim 15, wherein the adapted first configuration identifies at least one of: a time resource for transmitting the at least one first signal to reduce an overlap with the measurement gap; a time resource for transmitting the at least one first signal that does not occur during the measurement gap; and a time resource for not transmitting the at least one first signal to avoid or reduce an overlap with the measurement gap.

“21. The method of claim 15, wherein adapting the first configuration comprises: obtaining at least one performance characteristic, requirement, or target; and adapting the first configuration in accordance with said at least one performance characteristic, requirement, or target.

“22. A network node for configuring measurement gaps and sounding reference signal (SRS) switching, the network node comprising: a memory storing instructions; and a processor operable to execute the instructions to cause the network node to: obtain a first configuration associated with a transmission of at least one first radio signal subject to SRS switching by a wireless device, wherein the first configuration comprises SRS transmission configuration related to the SRS switching among carriers and/or antennas, the first radio signal is a random-access channel, RACH, SRS signal; obtaining a second configuration indicating a measurement gap for receiving at least one second radio signal by the wireless device; adapting the first configuration for the transmission by the wireless device of the at least one first radio signal subject to SRS switching while applying the second configuration; and transmitting the adapted first configuration to the wireless device.

“23. The network node of claim 22, wherein the adapted first configuration changes a periodicity for switching between carriers to avoid or reduce an overlap with the measurement gap of the second configuration.

“24. The network node of claim 22, wherein the processor is further configured to execute the instructions to cause the network node to perform a determination that the wireless device is able to meet one or more measurement requirements while the wireless device performs measurements associated with the at least one second signal according to the second configuration and transmits the at least one first signal according to the adapted first configuration.

“25. The network node of claim 22, wherein the adapted first configuration identifies at least one of: a percentage of SRS transmissions allowed for transmission by the wireless device; a percentage of SRS transmissions to be dropped by the wireless device; a number of SRS transmissions allowed for transmission by the wireless device; a number of SRS transmissions to he dropped by the wireless device; a time resource for transmitting the at least one first signal to reduce an overlap with the measurement gap; a time resource for transmitting the at least one first signal that does not occur during the measurement gap; and a time resource for not transmitting the at least one first signal to avoid or reduce an overlap with the measurement gap.

“26. The network node claim 22, wherein adapting the first configuration comprises: obtaining at least one performance characteristic, requirement, or target; and adapting the first configuration in accordance with said at least one performance characteristic, requirement, or target.

“27. A computer program comprising computer-readable instructions for causing at least one programmable processor to perform the method of claim 1.

“28. A computer-readable medium storing the computer program of claim 27.”

For more information, see this patent application: Siomina, Iana. Systems And Methods For Configuring Measurement Gaps And Sounding Reference Signal Switching. Filed September 29, 2017 and posted July 25, 2019. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190229868%22.PGNR.&OS=DN/20190229868&RS=DN/20190229868

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Network Business Daily, source Technology Newsletters

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Sales 2019 224 B
EBIT 2019 20 824 M
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