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Low-overhead aperiodic triggering of multi-symbol SRS

A non-periodic, sounding reference signal technology, used in multi-frequency code systems, pilot signal allocation, multiple use of transmission paths, etc.

Active Publication Date: 2022-06-03
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, how to aperiodically trigger SRS without increasing the DCI overhead due to the size of the SRS request field in LTE Release 16 UEs is an open problem

Method used

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  • Low-overhead aperiodic triggering of multi-symbol SRS
  • Low-overhead aperiodic triggering of multi-symbol SRS
  • Low-overhead aperiodic triggering of multi-symbol SRS

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Example 1: Configuration of different UE-specific subframes for Rel-16 SRS and legacy SRS

[0102] In this embodiment, Rel-16 SRS and legacy SRS for the UE are configured in different UE-specific SRS UL normal subframes, and utilize the same SRS request field in the existing DCI format (ie, for DCI format 0 / 2B / 2C / 2D is one bit, and two bits in DCI formats 4 / 4A / 4B) to trigger aperiodic SRS. Whether Rel-16 SRS or legacy SRS is triggered depends on which UE-specific SRS UL normal subframe the aperiodic SRS is triggered.

[0103] Figure 8 An example of this embodiment is shown. In this example, the cell-specific SRS subframes have a period of 2 milliseconds (ms), while the UE-specific UL normal subframes for legacy SRS allocations and the UE-specific UL normal subframes for Rel-16 SRS allocations have similar cycle. However, UE-specific UL normal subframes for legacy SRS allocations are offset by 4 ms relative to UE-specific UL normal subframes for Rel-16 SRS allocati...

Embodiment 2

[0113] Example 2: Higher layer parameters for switching between Release 16 SRS and legacy SRS

[0114] In this embodiment, the Rel-16 UE is configured with higher layer parameters (eg, RRC parameters) to switch between legacy SRS and aperiodic triggering of Rel-16 SRS. If the higher layer parameter is set to one value, DCI triggers legacy SRS; otherwise, if the higher layer parameter is set to another value, DCI triggers Release 16 SRS.

[0115] In some particular embodiments, when multiple SRS configurations are configured for the UE, higher layer parameters may be configured for each SRS configuration (ie, each legacy SRS configuration and each Release 16 SRS configuration), and the higher layer parameters One of the DCI formats can be activated. For example, higher layer parameters included in the legacy SRS configuration may be set to indicate that legacy SRS transmissions use DCI format 0 when triggered, while higher layer parameters included in the Release 16 SRS config...

Embodiment 3

[0121] Example 3: Using DCI to trigger a mix of Release 16 SRS and legacy SRS

[0122] In another embodiment, when more than one bit is used for SRS triggering in DCI format, such as two bits in DCI format 4, then each of the multiple higher layer configured SRS configurations can be or version 16SRS associated. When triggering the SRS configuration, the legacy or Rel-16 SRS is sent depending on the value indicated in the bit field for SRS triggering in the DCI. Figure 11 An example of associating SRS configuration with legacy or Rel-16 SRS when more than one bit is used in DCI for SRS triggering is shown in . In this example, if the bit field value indicates "01", the UE transmits the legacy SRS corresponding to SRS configuration 1. If the bit field value indicates "11", the UE transmits a Release 16 SRS corresponding to SRS configuration 3.

[0123] More precisely, the code points of the SRS request bit field in the DCI map to the SRS configurations of different higher l...

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Abstract

Systems and methods for providing aperiodic sounding reference signal (SRS) triggering in wireless systems are disclosed herein. Embodiments of methods performed by wireless devices and corresponding embodiments of wireless devices are disclosed. In some embodiments, a method for triggering aperiodic SRS in a wireless device includes: receiving a first SRS configuration for a first type of aperiodic SRS transmission and a second type of aperiodic SRS configuration for a second type of aperiodic SRS transmission. A second SRS configuration for transmission. The method also includes receiving downlink control information including parameters for triggering aperiodic SRS transmission; and determining whether to use the first SRS configuration or the second SRS configuration. The method also includes sending an aperiodic SRS transmission according to the determined SRS configuration. Embodiments of the method performed by the base station and corresponding embodiments of the base station are also disclosed.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of Provisional Patent Application Serial No. 62 / 719,990, filed August 20, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present disclosure relates to aperiodic sounding reference signal (SRS) triggering in wireless systems. Background technique [0004] Long Term Evolution (LTE) uses Orthogonal Frequency Division Multiplexing (OFDM) in the downlink and Discrete Fourier Transform (DFT) spread OFDM in the uplink (UL). Therefore, the basic LTE physical resources can be considered as figure 1 The time-frequency grid shown in , where each resource element (RE) corresponds to one OFDM subcarrier during one OFDM symbol interval. Furthermore, resource allocation in LTE is typically described in terms of resource blocks, which correspond to one time slot (0.5 milliseconds (ms)) in the time domain and 12 consecutive subcarriers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04W72/00H04L27/26
CPCH04L5/0048H04L5/0023H04L27/261H04L5/0078H04L5/005H04L5/0051H04L5/0037H04L5/0016
Inventor 西瓦·穆鲁加内森高世伟塞巴斯蒂安·法克瑟
Owner TELEFON AB LM ERICSSON (PUBL)