Resource elements for physical downlink channel and aperiodic interference measurement
阅读说明：本技术 用于物理下行链路信道和非周期性干扰测量的资源元素 (Resource elements for physical downlink channel and aperiodic interference measurement ) 是由 塞巴斯蒂安·菲克斯尔 高世伟 西瓦·穆鲁加内森 于 2018-12-21 设计创作，主要内容包括：本文提出的解决方案使网络节点(500、600)能够在调度用于对应无线设备(300、400)的第一资源元素集合上或包括除调度用于干扰测量资源的子集之外的全部的该第一集合在内的资源元素集合上发送物理下行链路信道,并且使无线设备(300、400)能够在该第一资源元素集合上或该资源元素集合上接收物理下行链路信道。从而,本文提出的解决方案避免了由重叠信号引起的问题,并因此改进了调度灵活性,降低了复杂度并减少了开销。(The solution presented herein enables a network node (500, 600) to transmit a physical downlink channel on a first set of resource elements scheduled for a corresponding wireless device (300, 400) or a set of resource elements including all but a subset of the first set of resources scheduled for interference measurement, and enables a wireless device (300, 400) to receive a physical downlink channel on or on the first set of resource elements. Thus, the solution proposed herein avoids the problems caused by overlapping signals and thus improves scheduling flexibility, reduces complexity and reduces overhead.)
1. A method (100) performed by a wireless device (300, 400) of receiving a physical downlink channel from a network node (500, 600), the method comprising:
Receiving (110), from the network node (500, 600), a first downlink control information, DCI, which schedules the physical downlink channel on a first plurality of resource elements, REs;
receiving (120), from the network node (500, 600), a second DCI that schedules aperiodic interference measurement resources on a second plurality of REs in downlink for interference measurement;
wherein the second DCI comprises a request field, and wherein the first plurality of REs comprises at least a subset of the second plurality of REs; and
receiving (130) the physical downlink channel from the network node (500, 600) on the first or a third plurality of REs in response to the request field, the third plurality of REs including the first plurality of REs but not the subset of the second plurality of REs.
2. The method (100) of claim 1, wherein the first DCI and the second DCI comprise a common DCI message.
3. The method (100) of claim 1, wherein the first DCI and the second DCI comprise different DCI messages.
4. The method (100) of any of claims 1-3, wherein the receiving (130) the physical downlink channel on the first or third plurality of REs comprises: receiving the physical downlink channel on the third plurality of REs when the request field indicates triggering aperiodic zero-power channel state information reference signal, A-ZP, CSI-RS resources.
5. The method (100) according to any one of claims 1-4, further including: obtaining (140) a plurality of interference measurement resource configurations from the network node (500, 600), wherein the request field indicates at least one of the plurality of interference measurement resources as one or more current interference measurement resource configurations.
6. The method (100) of claim 5, further comprising: determining (142), for each of the one or more current interference measurement resource configurations, whether a current interference measurement resource configuration for the wireless device (300, 400) includes a rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
7. The method (100) of claim 6, wherein the rate matching indication for each of the one or more current interference measurement resource configurations comprises a Boolean flag in an information element, IE, of the current interference measurement resource configuration, wherein the receiving (130) the physical downlink channel on the first or third plurality of REs comprises: receiving the physical downlink channel on the first or third plurality of REs in response to the Boolean flag.
8. The method (100) according to any one of claims 1-4, further including: determining (144) whether an interference measurement resource configuration for the wireless device (300, 400) comprises a rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
9. The method (100) of claim 8, wherein the rate matching indication comprises a boolean flag in an information element, IE, of the interference measurement resource configuration, wherein the receiving (130) the physical downlink channel on the first or third plurality of REs comprises: receiving the physical downlink channel on the first or third plurality of REs in response to the Boolean flag.
10. The method (100) of claim 8, wherein the rate matching indication comprises a zero power channel state information reference signal, ZP, CSI-RS, resource identifier, wherein the receiving (130) the physical downlink channel on the first or third plurality of REs comprises: receiving the physical downlink channel on the first or third plurality of REs in response to the ZP CSI-RS resource identifier.
11. The method (100) of claim 10, wherein the ZP CSI-RS resource identifier is included in an optional information element, IE, of the interference measurement resource configuration.
12. The method (100) of any of claims 1-11, wherein the physical downlink channel comprises a physical downlink shared channel, PDSCH.
13. The method (100) of any of claims 1-12, wherein the first DCI further comprises a trigger field indicating rate matching for a subset of the first plurality of REs associated with another wireless device in communication with the network node (500, 600), wherein the receiving (130) the physical downlink channel comprises: receiving the physical downlink channel on the first plurality of REs, the third plurality of REs, or a fourth plurality of REs in response to the request field and the trigger field, the fourth plurality of REs including the first plurality of REs but not the subset of the first plurality of REs, wherein the subset of the first plurality of REs is different from the subset of the second plurality of REs.
14. The method (100) of any of claims 1-13, wherein the aperiodic interference measurement resource comprises an aperiodic channel state information interference measurement, CSI-IM, resource.
15. An apparatus, comprising:
a communication circuit (320, 410, 420) configured to transmit uplink signals to a network node (500, 600) and to receive downlink signals from the network node (500, 600); and
processing circuitry (310, 430) configured to implement the method (100) according to any one of claims 1-14.
16. A wireless device (300, 400) configured to:
receiving first downlink control information, DCI, that schedules the physical downlink channel on a first plurality of resource elements, REs;
receiving a second DCI that schedules aperiodic interference measurement resources on a second plurality of REs in a downlink for interference measurement;
wherein the second DCI comprises a request field, and wherein the first plurality of REs comprises at least a subset of the second plurality of REs; and
receiving the physical downlink channel on the first plurality of REs or a third plurality of REs in response to the request field, the third plurality of REs including the first plurality of REs but not the subset of the second plurality of REs.
17. The wireless device of claim 16, wherein the first DCI and the second DCI comprise a common DCI message.
18. The wireless device of claim 16, wherein the first DCI and the second DCI comprise different DCI messages.
19. The wireless device of any one of claims 16-18, wherein the physical downlink channels received on the first or third plurality of REs comprises: physical downlink channels on the third plurality of REs when the request field indicates triggering aperiodic zero-power channel state information reference signal A-ZP CSI-RS resources.
20. The wireless device of any of claims 16-19, further configured to: obtaining a plurality of interference measurement resource configurations, wherein the request field indicates at least one of the plurality of interference measurement resources as one or more current interference measurement resource configurations.
21. The wireless device of any of claims 16-20, further configured to: for each of the one or more current interference measurement resource configurations, determining whether a current interference measurement resource configuration for the wireless device (300, 400) includes a rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
22. The wireless device of claim 21, wherein the rate matching indication for each of the one or more current interference measurement resource configurations comprises a boolean flag in an information element, IE, of the current interference measurement resource configuration, wherein the physical downlink channels received on the first or third plurality of REs comprises: a physical downlink channel on the first or third plurality of REs in response to the Boolean flag.
23. The wireless device of any of claims 16-19, further configured to: determining whether an interference measurement resource configuration for the wireless device (300, 400) includes a rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
24. The wireless device of claim 23, wherein the rate matching indication comprises a boolean flag in an information element, IE, of the interference measurement resource configuration, wherein the receiving (130) the physical downlink channel on the first or third plurality of REs comprises: receiving the physical downlink channel on the first or third plurality of REs in response to the Boolean flag.
25. The wireless device of claim 23, wherein the rate matching indication comprises a zero power channel state information reference signal, ZP, CSI-RS, resource identifier, wherein the receiving (130) the physical downlink channel on the first or third plurality of REs comprises: receiving the physical downlink channel on the first or third plurality of REs in response to the ZP CSI-RS resource identifier.
26. The wireless device of claim 25, wherein the ZP CSI-RS resource identifier is included in an optional information element, IE, of the interference measurement resource configuration.
27. The wireless device of any of claims 16-26, wherein the physical downlink channel comprises a Physical Downlink Shared Channel (PDSCH).
28. The wireless device of any of claims 16-27, wherein the first DCI further comprises a trigger field indicating rate matching for a subset of the first plurality of REs associated with another wireless device in communication with a network node (500, 600), wherein the received physical downlink channel comprises: a physical downlink channel on the first plurality of REs, the third plurality of REs, or a fourth plurality of REs in response to the request field and the trigger field, the fourth plurality of REs including the first plurality of REs but not the subset of the first plurality of REs, wherein the subset of the first plurality of REs is different from the subset of the second plurality of REs.
29. The wireless device of any of claims 16-28, wherein the aperiodic interference measurement resource comprises an aperiodic channel state information interference measurement, CSI-IM, resource.
30. A computer program product for controlling a wireless device (300, 400), the computer program product comprising software instructions that, when executed by at least one processing circuit (310, 430) of the wireless device (300, 400), cause the wireless device (300, 400) to perform the method according to any one of claims 1-14.
31. A computer readable medium in the form of a device readable medium (1630) comprising the computer program product according to claim 30.
32. The computer-readable medium of claim 31, wherein the computer-readable medium comprises a non-transitory computer-readable medium.
33. A method (200) performed by a network node (500, 600) of transmitting a physical downlink channel to a wireless device (300, 400), the method (200) comprising:
configuring (210) a first downlink control information, DCI, that schedules the physical downlink channel on a first plurality of resource elements, REs;
configuring (220) a second DCI that schedules aperiodic interference measurement resources on a second plurality of REs in downlink for interference measurement; and
Transmitting (230) the first DCI and the second DCI to the wireless device (300, 400);
wherein the second DCI comprises a request field;
wherein the first plurality of REs comprises at least a subset of the second plurality of REs; and
transmitting (240) the physical downlink channel on the first plurality of REs or a third plurality of REs, the third plurality of REs including the first plurality of REs but not the subset of the second plurality of REs, according to the request field.
34. The method (200) of claim 33, wherein the first DCI and the second DCI comprise a common DCI message.
35. The method (200) of claim 33, wherein the first DCI and the second DCI comprise different DCI messages.
36. The method (200) of any of claims 33-35, wherein the transmitting (240) the physical downlink channel on the first or third plurality of REs comprises: transmitting the physical downlink channel on the third plurality of REs when the request field indicates aperiodic zero-power channel state information reference signal, A-ZP, CSI-RS resources in a CSI request field.
37. The method (200) according to any one of claims 33-36, further including: transmitting (250) a plurality of interference measurement resource configurations to the wireless device (300, 400), wherein the request field indicates at least one of the plurality of interference measurement resources as one or more current interference measurement resource configurations.
38. The method (200) of claim 37, further comprising: for each of the one or more current interference measurement resource configurations, including (252) a rate matching indication in the current interference measurement resource configuration for the wireless device (300, 400), the rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
39. The method (200) of claim 38, wherein the rate matching indication for each of the one or more current interference measurement resource configurations comprises a boolean flag in an information element, IE, of the current interference measurement resource configuration, wherein the transmitting (240) the physical downlink channel on the first plurality of REs or the third plurality of REs comprises: transmitting the physical downlink channel on the first plurality of REs or the third plurality of REs according to the Boolean flag.
40. The method (200) according to any one of claims 33-37, further including: including (254) a rate matching indication in an interference measurement resource configuration for the wireless device (300, 400), the rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
41. The method (200) of claim 40, wherein the rate matching indication comprises a Boolean flag in an information element, IE, of the current interference measurement resource configuration, wherein the transmitting (240) the physical downlink channel on the first or third plurality of REs comprises: transmitting the physical downlink channel on the first plurality of REs or the third plurality of REs according to the Boolean flag.
42. The method (200) of claim 40, wherein the rate matching indication comprises a zero-power channel state information reference signal, ZP, CSI-RS, resource identifier, wherein the transmitting (240) the physical downlink channel on the first or third plurality of REs comprises: transmitting the physical downlink channel on the first or third plurality of REs according to the ZP CSI-RS resource identifier.
43. The method (200) of claim 42, wherein the ZP CSI-RS resource identifier is included in an optional information element, IE, of a CSI-IM configuration.
44. The method (200) of any of claims 33-43, according to which the physical downlink channel comprises a physical downlink shared channel, PDSCH.
45. The method (200) of any of claims 33-44, wherein the first DCI further comprises a trigger field indicating rate matching for a subset of the first plurality of REs associated with another wireless device (300, 400) in communication with the network node, wherein the transmitting (240) the physical downlink channel comprises: transmitting the physical downlink channel on the first plurality of REs, the third plurality of REs, or a fourth plurality of REs including the first plurality of REs but not the subset of the first plurality of REs according to the request field and the trigger field, wherein the subset of the first plurality of REs is different from the subset of the second plurality of REs.
46. The method (200) of any of claims 33-45, according to which the aperiodic interference measurement resource comprises an aperiodic channel state information interference measurement, CSI-IM, resource.
47. An apparatus (500, 600) comprising:
communication circuitry (520, 620, 630) configured to transmit downlink signals to a wireless device (300, 400) and receive uplink signals from the wireless device (300, 400); and
Processing circuitry (510, 610) configured to implement the method according to any of claims 19-32.
48. A network node arranged to:
configuring a first downlink control information, DCI, that schedules the physical downlink channel on a first plurality of resource elements, REs;
configuring a second DCI that schedules aperiodic interference measurement resources on a second plurality of REs in a downlink for interference measurement; and
transmitting the first DCI and the second DCI to a wireless device (300, 400);
wherein the second DCI comprises a request field;
wherein the first plurality of REs comprises at least a subset of the second plurality of REs; and
transmitting the physical downlink channel on the first plurality of REs or a third plurality of REs that includes the first plurality of REs but not the subset of the second plurality of REs according to the request field.
49. The network node of claim 48, wherein the first DCI and the second DCI comprise a common DCI message.
50. The network node of claim 48, wherein the first DCI and the second DCI comprise different DCI messages.
51. The network node of any one of claims 48-50, wherein the network node is configured to: transmitting the physical downlink channel on the third plurality of REs when the request field indicates aperiodic zero-power channel state information reference signal, A-ZP, CSI-RS resources in a CSI request field.
52. The network node of any of claims 48-51, further configured to: transmitting a plurality of interference measurement resource configurations to the wireless device (300, 400), wherein the request field indicates at least one of the plurality of interference measurement resources as one or more current interference measurement resource configurations.
53. The network node of claim 52, further configured to: for each of the one or more current interference measurement resource configurations, including a rate matching indication in the current interference measurement resource configuration for the wireless device (300, 400), the rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
54. The network node of claim 53, wherein the rate matching indication for each of the one or more current interference measurement resource configurations comprises a Boolean flag in an information element, IE, of the current interference measurement resource configuration, wherein the transmitting (240) the physical downlink channel on the first plurality of REs or the third plurality of REs comprises: transmitting the physical downlink channel on the first plurality of REs or the third plurality of REs according to the Boolean flag.
55. The network node of any of claims 48-52, further configured to: including a rate matching indication in an interference measurement resource configuration for the wireless device (300, 400), the rate matching indication indicating rate matching of the physical downlink channel around the second plurality of REs.
56. The network node of claim 55, wherein the rate matching indication comprises a Boolean flag in an information element, IE, of the current interference measurement resource configuration, wherein the transmitting (240) the physical downlink channel on the first or third plurality of REs comprises: transmitting the physical downlink channel on the first plurality of REs or the third plurality of REs according to the Boolean flag.
57. The network node of claim 55, wherein the rate matching indication comprises a zero power channel state information reference signal, ZP, CSI-RS, resource identifier, wherein the transmitting (240) the physical downlink channel on the first or third plurality of REs comprises: transmitting the physical downlink channel on the first or third plurality of REs according to the ZP CSI-RS resource identifier.
58. The network node of claim 57, wherein the ZP CSI-RS resource identifier is included in an optional Information Element (IE) of a CSI-IM configuration.
59. The network node of any of claims 48-58, wherein the physical downlink channel comprises a Physical Downlink Shared Channel (PDSCH).
60. The network node of any one of claims 48-59, wherein the first DCI further comprises a trigger field indicating rate matching for a subset of the first plurality of REs associated with another wireless device (300, 400) in communication with the network node, wherein the transmitting (240) the physical downlink channel comprises: transmitting the physical downlink channel on the first plurality of REs, the third plurality of REs, or a fourth plurality of REs including the first plurality of REs but not the subset of the first plurality of REs according to the request field and the trigger field, wherein the subset of the first plurality of REs is different from the subset of the second plurality of REs.
61. The network node of any of claims 48-60, wherein the aperiodic interference measurement resource comprises an aperiodic channel state information interference measurement, CSI-IM, resource.
62. A computer program product for controlling a network node (500, 600), the computer program product comprising software instructions, which, when executed by at least one processing circuit (510, 610) of the network node (500, 600), cause the network node (500, 600) to perform the method according to any of claims 33-46.
63. A computer readable medium in the form of a device readable medium (1630) comprising the computer program product according to claim 62.
64. The computer readable medium of claim 63, wherein the computer readable medium comprises a non-transitory computer readable medium.
Technical Field
The solution presented herein relates to Downlink Control Information (DCI), and scheduling Resource Elements (REs) using the DCI for receiving downlink transmissions on a physical downlink channel.
Background
Next generation mobile wireless communication systems (5G) or New Radios (NR) will support various sets of use cases and various sets of deployment scenarios. The latter includes deployments in low frequencies (e.g., hundreds of MHz), similar to today's Long Term Evolution (LTE) systems, and very high frequencies (e.g., tens of GHz of millimeter waves).
Similar to LTE, NR will use Orthogonal Frequency Division Multiplexing (OFDM) in the downlink (e.g., from a network node, gbb, eNB, or base station to a User Equipment (UE), wireless device, etc.). In the uplink (e.g., from UE to gNB), both discrete fourier transform spread (DFT-spread) OFDM and OFDM will be supported.
The basic NR physical resource can thus be viewed as a time-frequency grid, where each resource element corresponds to one OFDM subcarrier during one OFDM symbol interval. Fig. 1 shows an example of such a time-frequency grid. The resource allocation in a slot is described in terms of Resource Blocks (RBs) in the frequency domain and the number of OFDM symbols in the time domain. An RB corresponds to 12 consecutive subcarriers, and a slot is composed of 14 OFDM symbols.
NR supports different subcarrier spacing values. The subcarrier spacing value (also called parameter set (numerology)) supported in NR is set by Δ f ═ 15 × 2 α) kHz is given, where α represents a non-negative integer.
In the time domain, similar to LTE, downlink and uplink transmissions in NR are organized into subframes of the same size. Fig. 2 shows an exemplary NR time domain structure with a 15kHz subcarrier spacing. The sub-frame is further divided into slots and for parameter set (15 × 2)α) kHz, number of slots per sub-frame of 2α+1。
NR supports "slot-based" transmission. In each slot, the gNB transmits Downlink Control Information (DCI) regarding which UEs data will be sent out and on which resources the data will be sent in the current downlink slot. The DCI is carried on a Physical Downlink Control Channel (PDCCH), and the data is carried on a Physical Downlink Shared Channel (PDSCH).
Transmissions on the PDCCH are typically sent in a control resource set (CORSET) in the first few OFDM symbols in each slot. The UE first decodes the PDCCH. If the PDCCH is successfully decoded, the UE decodes the corresponding PDSCH based on the decoded DCI in the PDCCH.
The PDCCH is also used to dynamically schedule uplink data transmissions. Similar to the downlink, the UE first decodes an uplink grant in DCI carried by the PDCCH, and then transmits data on a Physical Uplink Shared Channel (PUSCH) based on the decoded control information (e.g., modulation order, coding rate, uplink resource allocation, etc.) in the uplink grant.
During network connection, each UE is assigned a unique cell radio network temporary identifier (C-RNTI). Cyclic Redundancy Check (CRC) bits appended to the DCI for the UE are scrambled by the C-RNTI of the UE, enabling the UE to identify its DCI by checking the CRC bits of the DCI against the assigned C-RNTI.
For UL scheduling of PUSCH, at least the following bit fields are included in the Uplink (UL) DCI:
frequency domain resource assignment
Time domain resource assignment
Modulation and coding scheme-5 bits
New data indicator-1 bit
Redundancy version-2 bits
HARQ process number-4 bits
TPC Command-2 bits for scheduled PUSCH
Channel State Information (CSI) request-0, 1, 2, 3, 4, 5, or 6 bits determined by the upper layer parameter ReportTriggerSize.
For Downlink (DL) scheduling of PDSCH, at least the following bit fields are included in DL DCI
Frequency domain resource assignment
Time domain resource assignment
Modulation and coding scheme-5 bits
New data indicator-1 bit
Redundancy version-2 bits
Hybrid automatic repeat request (HARQ) process number-4 bits
Zero power CSI reference signal (ZP CSI-RS) trigger-X bits
The gNB obtains DL state information (CSI) from the UE using CSI feedback to determine how to transmit DL data to the UE over multiple antenna ports. The CSI generally includes a channel Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI). The RI is used to indicate the number of data layers that can be simultaneously transmitted to the UE, the PMI is used to indicate a precoding matrix on the indicated data layers, and the CQI is used to indicate a modulation and coding rate that can be achieved using the indicated rank and precoding matrix.
In addition to periodic and aperiodic CSI reporting as in LTE, NR also supports semi-persistent CSI reporting, see for example third generation partnership project (3GPP) Technical Specification (TS)38.214 v15.0.0 (2017-12). Thus, NR supports the following three types of CSI reports:
periodic CSI on PUCCH (P-CSI) reporting: the CSI is reported periodically by the UE. Parameters such as periodicity and slot offset are semi-statically configured by upper layer Radio Resource Control (RRC) signaling from the gNB to the UE
Aperiodic CSI (a-CSI) reporting on PUSCH: this type of CSI reporting involves a single (e.g., one-time) CSI report reported by the UE, which is dynamically triggered by the gNB using DCI. Some parameters related to configuration of aperiodic CSI reports are configured semi-statically through RRC signaling, but triggers are dynamic
Semi-persistent CSI on PUSCH (SP-CSI) reporting: similar to periodic CSI reporting, semi-persistent CSI reporting has a periodicity and slot offset that can be semi-statically configured. However, dynamic triggering from the gNB to the UE may be required to allow the UE to start semi-persistent CSI reporting. Dynamic triggering from the gNB to the UE is required to request the UE to stop semi-persistent CSI reporting
The UE measures downlink CSI using a non-zero power (NZP) CSI-RS. The gNB transmits the CSI-RS through each transmit (Tx) antenna port at the gNB and the CSI-RS is multiplexed in the time, frequency, and code domains for different antenna ports such that the channel between each Tx antenna port at the gNB and each receive antenna port at the UE can be measured by the UE. The time-frequency resources used for transmitting the CSI-RS are referred to as CSI-RS resources.
In NR, the following three types of CSI-RS transmission are supported:
periodic CSI-RS (P CSI-RS): the CSI-RS is transmitted periodically in certain slots. The CSI-RS transmission is semi-statically configured using parameters such as CSI-RS resources, periodicity, and slot offset.
Aperiodic CSI-RS (AP CSI-RS): this is a single CSI-RS transmission that may occur in any slot. Here, single means that only one CSI-RS transmission occurs per trigger. CSI-RS resources (e.g., resource element positions including subcarrier positions and OFDM symbol positions) for aperiodic CSI-RS are semi-statically configured. The transmission of aperiodic CSI-RS is triggered by dynamic signaling through PDCCH using CSI request field in UL DCI. The plurality of aperiodic CSI-RS resources may be included in a set of CSI-RS resources, and triggering of the aperiodic CSI-RS occurs based on the set of resources.
Semi-permanent CSI-RS (SP CSI-RS): similar to the periodic CSI-RS, the resources for the semi-persistent CSI-RS transmission are semi-statically configured with parameters such as periodicity and slot offset. However, unlike periodic CSI-RS, SPCSI-RS requires dynamic signaling to activate and deactivate CSI-RS transmission.
In case of aperiodic CSI-RS and/or aperiodic CSI reporting, the gNB RRC is reported as ScThe CSI triggers the state to configure the UE. Each trigger state contains an aperiodic CSI report setting to trigger and an associated set of aperiodic CSI-RS resources.
In NR, a UE may be configured with N ≧ 1 CSI reporting settings (e.g., reportConfigs), M ≧ 1 resource settings (e.g., ResourceConfigs), and one CSI measurement setting, where the CSI measurement setting includes L ≧ 1 measurement links (e.g., MeasLinkConfigs). At least the following configuration parameters are signaled via RRC for CSI acquisition.
1. N, M and L are indicated implicitly or explicitly
2. Each CSI report setting includes at least the following:
reported CSI parameters, e.g., RI, PMI and CQI
CSI type (if reported), e.g. type I or type II
Codebook configuration including codebook subset restriction
Time-domain behavior, e.g. P-CSI, SP-CSI or A-CSI
Frequency granularity of CQI and PMI, e.g. wideband, partial band or subband
Measurement restriction configuration, e.g. Resource Blocks (RBs) in the frequency domain and slots in the time domain
3. In each CSI-RS resource setting:
configuration with S ≧ 1 CSI-RS resource set
For each resource set s, have KsThe configuration of more than or equal to 1 CSI-RS resources at least comprises the following steps: mapping to REs, number of antenna ports, time domain behavior, etc.
Time domain behavior: non-periodic, periodic or semi-permanent
4. In each of the L links in the CSI measurement setup:
CSI report setting indication, resource setting indication, quantity to measure (channel or interference)
One CSI report setup can be linked with one or more resource setups
Multiple CSI report settings can be linked to one resource setting
Fig. 3 illustrates an exemplary aperiodic CSI (a-CSI) report. The a-CSI reporting on PUSCH is triggered by DCI (e.g., UL DCI) used to schedule PUSCH. The special CSI request bit field in the DCI is for this purposeAs defined in (1). Each value of the CSI request bit field defines a code point, and each code point may be associated with a CSI report trigger state configured by an upper layer. The first code point of all "0" corresponds to no CSI request. For A-CSI reporting, S CEach of the plurality of trigger states includes an indication of one or more a-CSI reports to be triggered. Optionally, each triggered a-CSI report may also trigger an aperiodic NZP CSI-RS resource set for channel measurements, an aperiodic CSI-IM, and/or an aperiodic NZP CSI-RS for interference measurements. Thus, each CSI report trigger state defines at least the following information:
resource allocation
CSI-RS resources for channel measurement
Interference measurement resources for interference measurement
CSI reporting configuration:
the type of CSI report, e.g., wideband or subband, type I or type II codebook used, etc.
Bit width L of CSI request fieldcConfigurable between 0 and 6 bits. Number of states S when CSI triggerscGreater than the number of code points (e.g.,
To measure channel and interference, two resources are defined: non-zero power (NZP) CSI-RS and CSI-IM. The network node (or the gNB) sends the NZP CSI-RS to the UE to enable the UE to estimate the downlink channel to the network node. For CSI-IM, the network indicates the resources given by the set of REs for the UE to perform interference measurements on, see e.g. 3GPP TS 38.211v15.0.0 (2017-12).
Zero Power (ZP) CSI-RS resources may also be configured to the UE. As the name implies, the UE should not assume that the gNB transmits on REs occupied by ZP CSI-RS configured to the UE.
Disclosure of Invention
The solution proposed herein solves the problem associated with overlapping signals that may cause a wireless device to measure its own signal as interference. To address this problem, the solution presented herein enables a network node to transmit a physical downlink channel on a first set of resource elements scheduled for a wireless device or a set of resource elements including all but a subset of the first set of resources scheduled for interference measurement, and enables the wireless device to receive the physical downlink channel on the first set of resource elements or on the set of resource elements. Thus, the solution proposed herein avoids the problems caused by overlapping signals and thus improves scheduling flexibility, reduces complexity and reduces overhead.
One embodiment includes a method performed by a wireless device of receiving a physical downlink channel from a network node. The method includes receiving first Downlink Control Information (DCI) from a network node, the first DCI scheduling a physical downlink channel on a first plurality of Resource Elements (REs). The method also includes receiving a second DCI from the network node, the second DCI scheduling aperiodic interference measurement resources on a second plurality of REs in the downlink for interference measurement. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The method further comprises the following steps: in response to the request field, a physical downlink channel is received from the network node on the first plurality of REs or the third plurality of REs. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs.
One embodiment includes a wireless device including communication circuitry and processing circuitry. The communication circuitry is configured to transmit uplink signals to the network node and receive downlink signals from the network node. The processing circuitry is configured to receive a first DCI from a network node, the first DCI scheduling a physical downlink channel on a first plurality of REs. The processing circuitry is also configured to receive a second DCI from the network node, the second DCI scheduling aperiodic interference measurement resources on a second plurality of REs in the downlink for interference measurement. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The processing circuit is further configured to: in response to the request field, a physical downlink channel is received on the first plurality of REs or the third plurality of REs. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs.
One embodiment comprises a wireless device comprising a receiving unit/circuit/module and a processor unit/circuit/module. A receiving unit/circuit/module is configured to receive a first DCI from a network node, the first DCI scheduling a physical downlink channel on a first plurality of REs. The receiving unit/circuitry/module is further configured to receive, from the network node, a second DCI that schedules aperiodic interference measurement resources on a second plurality of REs in the downlink for interference measurement. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The receiving unit/circuit/module is further configured to: in response to the request field, a physical downlink channel is received on the first plurality of REs or the third plurality of REs. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs.
One embodiment includes a computer program product for controlling a wireless device. The computer program product includes software instructions that, when executed by at least one processing circuit of a wireless device (300, 400), cause the wireless device to receive a first DCI from a network node, the first DCI scheduling a physical downlink channel on a first plurality of REs. The software instructions, when executed by the at least one processing circuit, further cause the wireless device to receive a second DCI from the network node, the second DCI scheduling aperiodic interference measurement resources on a second plurality of REs in the downlink for interference measurement. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The software instructions, when executed by the at least one processing circuit, further cause the wireless device to receive a physical downlink channel on the first plurality of REs or the third plurality of REs in response to the request field. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs. In one exemplary embodiment, a computer-readable medium includes a computer program product. In one example embodiment, the computer readable medium includes a non-transitory computer readable medium.
One exemplary embodiment includes a method performed by a base station of transmitting a physical downlink channel to a wireless device. The method includes configuring a first DCI that schedules a physical downlink channel on a first plurality of REs. The method further comprises the following steps: configuring a second DCI that schedules aperiodic interference measurement resources for interference measurement on a second plurality of REs in the downlink, and transmitting the first DCI and the second DCI to the wireless device. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The method further comprises the following steps: transmitting a physical downlink channel on the first plurality of REs or the third plurality of REs according to the request field. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs.
One embodiment includes a network node comprising communication circuitry and processing circuitry. The communication circuit is configured to transmit downlink signals to the wireless device and receive uplink signals from the wireless device. The processing circuitry is configured to: a first DCI is configured to schedule a physical downlink channel on a first plurality of REs, and a second DCI is configured to schedule aperiodic interference measurement resources on a second plurality of REs in the downlink for interference measurement. The communication circuitry is configured to transmit the first DCI and the second DCI to the wireless device. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The communication circuit is further configured to: transmitting a physical downlink channel on the first plurality of REs or the third plurality of REs according to the request field. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs.
One embodiment comprises a network node comprising a processor unit/circuit/module and a transmitter unit/circuit/module. The processor unit/circuit/module is configured to: a first DCI is configured to schedule a physical downlink channel on a first plurality of REs, and a second DCI is configured to schedule aperiodic interference measurement resources on a second plurality of REs in the downlink for interference measurement. The transmitter unit/circuitry/module is configured to transmit the first DCI and the second DCI to the wireless device. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The transmitter unit/circuit/module is further configured to: transmitting a physical downlink channel on the first plurality of REs or the third plurality of REs according to the request field. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs.
One embodiment comprises a computer program product for controlling a network node. The computer program product includes software instructions that, when executed by at least one processing circuit of a network node, cause the network node to configure a first DCI that schedules a physical downlink channel on a first plurality of REs and configure a second DCI that schedules aperiodic interference measurement resources on a second plurality of REs in the downlink for interference measurement. The software instructions, when executed by the at least one processing circuit, further cause the network node to transmit the first DCI and the second DCI to the wireless device. The second DCI includes a request field, and the first plurality of REs includes at least a subset of the second plurality of REs. The software instructions, when executed by the at least one processing circuit, further cause the network node to transmit a physical downlink channel on the first plurality of REs or the third plurality of REs according to the request field. The third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs. In one exemplary embodiment, a computer-readable medium includes a computer program product. In one example embodiment, the computer readable medium includes a non-transitory computer readable medium.
Drawings
Fig. 1 shows a block diagram of NR physical resources.
Fig. 2 shows the NR time domain structure with 15kHz subcarrier spacing.
Fig. 3 shows an example of aperiodic CSI reporting.
Fig. 4 shows an example of the solution proposed herein according to an exemplary embodiment.
Fig. 5 shows another example of the solution proposed herein according to an exemplary embodiment.
Fig. 6 shows another example of the solution proposed herein according to an exemplary embodiment.
Fig. 7 shows an example flow diagram in accordance with an example embodiment.
Fig. 8 shows another example flow diagram in accordance with an example embodiment.
Fig. 9 shows a block diagram of a wireless device according to an example embodiment.
Fig. 10 shows a block diagram of a wireless device according to an example embodiment.
Fig. 11 shows a block diagram of a network node according to an example embodiment.
Fig. 12 shows a block diagram of a network node according to an example embodiment.
Fig. 13 shows an exemplary wireless network suitable for the solution presented herein.
Fig. 14 shows an exemplary UE suitable for use in the solution presented herein.
Fig. 15 shows an exemplary virtual environment suitable for use with the solution presented herein.
Fig. 16 shows an exemplary telecommunication network suitable for the solution presented herein.
Fig. 17 shows an exemplary system including a host computer suitable for use with the solution presented herein.
Fig. 18 illustrates an exemplary method implemented in a communication system according to an embodiment of the solution presented herein.
Fig. 19 illustrates another exemplary method implemented in a communication system in accordance with an embodiment of the solution presented herein.
Fig. 20 illustrates another exemplary method implemented in a communication system in accordance with an embodiment of the solution presented herein.
Fig. 21 illustrates another exemplary method implemented in a communication system in accordance with an embodiment of the solution presented herein.
Detailed Description
The PDSCH of the UE should be rate matched around the ZP CSI-RS resources. The zpccsi-RS resource may be configured to the UE for three purposes. Rate matching a physical channel around another physical channel or signal means that the complex-valued modulation symbols of the physical channel are not mapped to those resource elements occupied by the other physical channel or signal. First, ZP CSI-RS may be configured to the UE to protect NZP CSI-RS transmissions from one or more neighboring cells. Second, zpccsi-RS may be used to indicate whether PDSCH is mapped to CSI-IM. Third, the (aperiodic) ZP CSI-RS may be used to indicate that the UE should rate match the PDSCH of another UE around the (beamformed) NZP CSI-RS for measurement by the UE. The aperiodic ZP CSI-RS field in the DL DCI is included primarily for this third purpose.
In a typical use case, the network will not send anything on REs occupied by CSI-IM, so the UE can measure inter-cell interference on it. To indicate that PDSCH is not mapped to REs occupied by CSI-IM, ZP CSI-RS is typically configured to overlap with CSI-IM. Since CSI-IM and ZP CSI-RS resources typically overlap, CSI-IM is colloquially referred to as ZP CSI-RS based Interference Measurement Resource (IMR). The IMR may be aperiodic (AP IMR), semi-permanent (SP IMR), or periodic (P IMR). Note that in NR, NZP CSI-RS may also be configured as IMR.
It should be noted that the ZP CSI-RS for indicating whether PDSCH is mapped to CSI-IM RE is configured independently from CSI-IM. To illustrate the reason, consider the multi-TRP example of coordinated multipoint transmission (CoMP) shown in fig. 4. In this example, the UE is currently being served by TRP1 and receives the PDSCH from
Fig. 5 illustrates another exemplary scenario. In this scenario, when a first UE is instructed to measure CSI through an aperiodic NZP CSI-RS for a channel and CSI through CSI-M for interference in a slot, and a second UE in the same cell is scheduled with PDSCH in the same slot, the second UE needs to be informed that NZP CSI-RS and CSI-IM are present in the slot, so that the second UE knows that PDSCH is not transmitted in REs occupied by NZP CSI-RS and CSI-IM (e.g., rate matching). An example is shown in fig. 5, where aperiodic NZP CSI-RS and CSI-IM for
In NR, the following is agreed to be supported for pairing of Channel Measurement Resources (CMR) and Interference Measurement Resources (IMR):
for ZP CSI-RS based IMR (e.g., CSI-IM), the following combinations of P/SP/AP CMR and IMR are supported:
for the a-CSI report,
P CMR
S CMR
AP CMR
P IMR
is that
Whether or not
Whether or not
SP IMR
Whether or not
Is that
Whether or not
AP IMR
Whether or not
Whether or not
Is that
That is, if aperiodic CMR (NZP CSI-RS) is used, aperiodic IMR is also used.
In most practical implementations (not involving CoMP), it is beneficial to always configure overlapping CSI-IM and ZP CSI-RS resources so that the UE does not measure its own PDSCH as interference. This means that for UL DCI triggered aperiodic CMR/IMR (where the presence of CSI-IM is dynamically indicated via the CSI request field in UL DCI), if PDSCH is scheduled in the same time slot as CSI-IM occurs, the ZP CSI-RS trigger field in DL DCI would have to be used to indicate the corresponding aperiodic ZP CSI-RS. This leads to the following adverse effects:
If a first UE receives PDSCH and measures aperiodic CSI-IM in the same slot, the gNB cannot trigger aperiodic CSI-RS/CSI-IM measurements for a second UE in the same slot, as this would require the first UE to rate match its PDSCH around the second UE CSI-RS/CSI-IM. The rate matching cannot be indicated because the ZP CSI-RS trigger field has been used to indicate rate matching around the first UE CSI-IM
Code points of the ZP CSI-RS trigger field are exhausted because all possible CSI-IM positions must be possible to trigger, which limits the number of possible CSI-RS positions that can rate match the PDSCH around
These two adverse effects severely limit the scheduling flexibility of the gNB, increase implementation complexity, and may result in additional signaling overhead
Certain aspects of the present disclosure and embodiments thereof may provide solutions to these challenges or other challenges. Whether PDSCH should be rate matched around is determined by the CSI request field in UL DCI using one of the following options:
1. the trigger state of the CSI request field may optionally trigger an aperiodic ZP CSI-RS resource set
2. The CSI-IM resource definition includes ZP CSI-RS resource identifiers
3. The CSI-IM resource definition includes a state indicating whether the CSI-IM resource should be rate matched by PDSCH around
4. Rate matching indicator included in CSI measurement setup linked to CSI-IM resource
The following provides exemplary embodiments according to the solution presented herein.
1. A method performed by a wireless device for receiving a physical downlink channel, the method comprising:
obtaining an RRC message comprising a CSI measurement configuration comprising information how to interpret a CSI request field
Receiving, from a network node, a Downlink Control Information (DCI) message scheduling a physical downlink channel on a first set of Resource Elements (REs)
Receiving a Downlink Control Information (DCI) message from a network node scheduling uplink transmissions, wherein the DCI message comprises a CSI request field, and wherein the CSI request field indicates measurements on an aperiodic CSI-IM occupying a second set of REs, wherein at least a subset of the second set of REs is included in the first set of REs
Determining from a CSI request field in a DCI message scheduling uplink transmissions whether there is a downlink physical signal on the second set of REs
Receiving a physical downlink channel based on the determined resource occupancy
2. The method of 1, wherein determining comprises: identifying whether the CSI request field indicates that an aperiodic ZPCCSI-RS resource is triggered.
3. The method of 1-2, wherein the CSI-IM resource configuration includes and indicates whether the second set of REs should be rate matched around by downlink physical signals.
4. The method of claim 3, wherein the indication comprises the ZP CSI-RS resource identifier as an optional Information Element (IE).
5. The method of claim 3, wherein the indication comprises a Boolean cell.
6. The method of 1-5, wherein the DCI message scheduling the physical downlink channel is the same as the DCI message scheduling the uplink transmission.
7. The method of 1-5, wherein the DCI message scheduling the physical downlink channel is a different DCI message than the DCI message scheduling the uplink transmission.
8. The method of 1-7, wherein the physical downlink channel is a Physical Downlink Shared Channel (PDSCH).
9. The method according to 1-8, wherein the DCI message scheduling the physical downlink channel additionally comprises a ZP CSI-RS trigger field determining whether a physical signal is present on another subset of the first set of REs.
Certain embodiments may provide one or more of the following technical advantages, such as increased scheduling flexibility for the gNB, lower implementation complexity, and/or lower signaling overhead.
In view of the above embodiments, the present disclosure generally includes embodiments that may, for example, address one or more of the problems disclosed herein. One exemplary embodiment includes a method performed by a wireless device of receiving a physical downlink channel from a network node. The method comprises the following steps: the method includes receiving, from a network node, a first Downlink Control Information (DCI) message scheduling a physical downlink channel on a first plurality of Resource Elements (REs), and receiving, from the network node, a second DCI message scheduling aperiodic channel state information interference measurement (CSI-IM) resources for CSI measurement on a second plurality of REs in a downlink. The second DCI message includes a CSI request field. The first plurality of REs includes at least a minority subset of the second plurality of REs. In other words, a subset of the second plurality of REs overlaps with some portion of the first plurality of REs. In other words, at least one of the second plurality of REs is part of the first plurality of REs. The method further comprises the following steps: in response to the CSI request field, a physical downlink channel is received on the first plurality of REs or a third plurality of REs, wherein the third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs. In some examples, the second plurality of REs is entirely included within the first plurality of REs, i.e., the third plurality of REs may include the first plurality of REs but not the second plurality of REs. As used herein, "receiving a physical downlink channel" on a particular set of resource elements is synonymous with receiving (or decoding) data symbols carried by the physical downlink channel on the particular set of resource elements.
In some embodiments, the first DCI message and the second DCI message comprise the same DCI message, while in other embodiments the first DCI message and the second DCI message comprise different DCI messages.
In some embodiments, the wireless device receives a physical downlink channel on a third plurality of REs when the CSI request field indicates that an aperiodic zero-power CSI reference signal (a-zpccsi-RS) resource is triggered.
In some embodiments, the wireless device obtains a plurality of CSI measurement configurations from the network node, wherein the CSI request field indicates one of the plurality of CSI measurement configurations as the current CSI measurement configuration.
In some embodiments, the wireless device determines whether a current CSI measurement configuration for the wireless device includes a rate matching indication indicating rate matching of a physical downlink channel around the second plurality of REs. The rate matching indication may, for example, include a boolean flag in an Information Element (IE) of the current CSI measurement configuration, wherein the wireless device receives the physical downlink channel on the first plurality of REs or the third plurality of REs in response to the boolean flag.
In some embodiments, the method further comprises: determining whether a CSI interference measurement (CSI-IM) resource configuration for the wireless device includes a rate matching indication indicating rate matching of a physical downlink channel around the second plurality of REs. The rate matching indication may, for example, comprise a boolean flag in an Information Element (IE) of the CSI-IM resource configuration, wherein the wireless device receives the physical downlink channel on the first plurality of REs or the third plurality of REs in response to the boolean flag. In other embodiments, the rate matching indication includes a ZP CSI-RS resource identifier, wherein the physical downlink channel is received by the wireless device on the first or third plurality of REs in response to the ZP CSI-RS resource identifier. In some embodiments, the ZP CSI-RS resource identifier is included in an optional Information Element (IE) of the CSI-IM resource configuration.
In some embodiments, the physical downlink channel comprises a Physical Downlink Shared Channel (PDSCH).
In some embodiments, the first DCI message further includes a trigger field indicating rate matching for a subset of the first plurality of REs associated with another wireless device in communication with the network node, wherein the wireless device receives a physical downlink channel on the first, third, or fourth plurality of REs in response to the CSI request field and the trigger field, the fourth plurality of REs including the first plurality of REs but not including the subset of the first plurality of REs, and wherein the subset of the first plurality of REs is different from the subset of the second plurality of REs. For example, the ZP CSI-RS field in the first DCI message may indicate rate matching around NZP CSI-RS/IM of another wireless device, limiting which of the first plurality of REs may be used for the physical downlink channel.
Another exemplary embodiment includes a method performed by a base station of transmitting a physical downlink channel to a wireless device. The method comprises the following steps: configuring a first Downlink Control Information (DCI) message that schedules a physical downlink channel on a first plurality of Resource Elements (REs), and configuring a second DCI message that schedules aperiodic channel state information interference measurement (CSI-IM) resources on a second plurality of REs in the downlink for CSI measurement. The method also includes transmitting a first DCI message and a second DCI message to the wireless device, wherein at least one of the first DCI message and the second DCI message includes a CSI request field, and wherein the first plurality of REs includes at least a subset of the second plurality of REs. In other words, a subset of the second plurality of REs overlaps with some portion of the first plurality of REs. In other words, at least one of the second plurality of REs is part of the first plurality of REs. The method further comprises the following steps: transmitting a physical downlink channel to the wireless device on the first plurality of REs or a third plurality of REs according to the CSI request field, the third plurality of REs including the first plurality of REs but not the subset of the second plurality of REs. In some examples, the second plurality of REs is entirely included within the first plurality of REs, i.e., the third plurality of REs may include the first plurality of REs but not the second plurality of REs. As used herein, "transmitting a physical downlink channel" on a particular set of resource elements is synonymous with transmitting data symbols carried by the physical downlink channel on the particular set of resource elements.
In some embodiments, the first DCI message and the second DCI message comprise the same DCI message, while in other embodiments the first DCI message and the second DCI message comprise different DCI messages.
In some embodiments, the base station transmits the physical downlink channel on the third plurality of REs when the CSI request field indicates aperiodic zero-power CSI reference signal (a-ZP CSI-RS) resources in the CSI request field.
In some embodiments, the method further includes transmitting a plurality of CSI measurement configurations to the wireless device, wherein the CSI request field indicates one of the plurality of CSI measurement configurations as the current CSI measurement configuration. In some embodiments, a rate matching indication is included in the current CSI measurement configuration for the wireless device, wherein the rate matching indication indicates rate matching of the physical downlink channel around the second plurality of REs. In some embodiments, the rate matching indication includes a boolean flag in an Information Element (IE) of the current CSI measurement configuration, wherein the base station transmits the physical downlink channel on the first plurality of REs or the third plurality of REs according to the boolean flag.
In some embodiments, the method further comprises: include a rate matching indication in a CSI interference measurement (CSI-IM) resource configuration for the wireless device, wherein the rate matching indication indicates rate matching of a physical downlink channel around the second plurality of REs. In some embodiments, the rate matching indication comprises a boolean flag in an Information Element (IE) of the CSI-IM resource configuration, wherein the base station transmits the physical downlink channel on the first plurality of REs or the third plurality of REs according to the boolean flag. In some embodiments, the rate matching indication includes a ZP CSI-RS resource identifier, wherein the base station transmits the physical downlink channel on the first or third plurality of REs according to the ZP CSI-RS resource identifier. In some embodiments, the zpccsi-RS resource identifier is included in an optional Information Element (IE) of the CSI-IM configuration.
In some embodiments, the physical downlink channel comprises a Physical Downlink Shared Channel (PDSCH).
In some embodiments, the first DCI message further includes a trigger field indicating rate matching for a subset of the first plurality of REs associated with another wireless device in communication with the base station, wherein the base station transmits a physical downlink channel on the first, third, or fourth plurality of REs according to the CSI request field and the trigger field, wherein the fourth plurality of REs includes the first plurality of REs but does not include the subset of the first plurality of REs, and wherein the subset of the first plurality of REs is different from the subset of the second plurality of REs. For example, the ZP CSI-RS field in the first DCI message may indicate rate matching around NZP CSI-RS/IM of another wireless device, limiting which of the first plurality of REs the base station may use for transmitting the physical downlink channel.
FIG. 7 depicts a method 100 according to a particular embodiment. The method 100 includes a wireless device receiving first DCI from a network node scheduling a physical downlink channel (e.g., PDSCH) on a first plurality of REs (block 110). The method also includes the wireless device receiving, from the network node, a second DCI scheduling aperiodic CSI-IM resources for CSI measurement on a second plurality of REs in the downlink, wherein the second DCI includes a CSI request field, and wherein the first plurality of REs includes at least a subset of the second plurality of REs (block 120). The method further comprises the following steps: the wireless device receives a physical downlink channel on the first plurality of REs or a third plurality of REs in response to the CSI request field, wherein the third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs (block 130). In some embodiments, the method 100 may further include obtaining a plurality of interference measurement resource configurations from the network node (optional block 140). For this embodiment, the request field indicates at least one of the plurality of interference measurement resource configurations as one or more current interference measurement resource configurations. Further to this embodiment, the method 100 may further comprise: for each of the one or more current interference measurement resource configurations, it is determined whether the current interference measurement resource configuration for the wireless device includes a rate matching indication indicating rate matching of a physical downlink channel around the second plurality of REs (optional block 144). In other embodiments, the method 100 may further include: it is determined whether an interference measurement resource configuration for the wireless device includes a rate matching indication indicating rate matching of a physical downlink channel around the second plurality of REs (optional block 144). As used herein, "receiving a physical downlink channel" on a particular set of resource elements is synonymous with receiving (or decoding) a message carried by the physical downlink channel on the particular set of resource elements. In one exemplary embodiment, the first DCI and the second DCI comprise the same DCI message, e.g., a common DCI message. In another exemplary embodiment, the first DCI and the second DCI include different DCI messages.
FIG. 8 depicts a method 200 according to other particular embodiments. The method 200 comprises the following steps: the network node configures first DCI scheduling a physical downlink channel (e.g., PDSCH) on a first plurality of REs (block 210). The method further comprises the following steps: the network node configures a second DCI that schedules the aperiodic CSI-IM resource on a second plurality of REs in the downlink for CSI measurement, wherein the second DCI includes a CSI request field, and wherein the first plurality of REs includes at least a subset of the second plurality of REs (block 220). The method also includes the network node transmitting the first DCI and the second DCI to the wireless device (block 230). The method also includes the network node transmitting a physical downlink channel to the wireless device on the first plurality of REs or a third plurality of REs according to the CSI request field, wherein the third plurality of REs includes the first plurality of REs but does not include the subset of the second plurality of REs (block 240). In one exemplary embodiment, the network node may transmit the first DCI and the second DCI in the same DCI message (e.g., a common DCI message) (optional block 232). In another exemplary embodiment, the network node may send the first DCI and the second DCI in different DCI messages (optional block 234). In some embodiments, method 200 may further include transmitting a plurality of interference measurement resource configurations to the wireless device (optional block 250). For this embodiment, the request field indicates at least one of the plurality of interference measurement resource configurations as one or more current interference measurement resource configurations (optional block 252). Further to this embodiment, the method 200 may further comprise: for each of the one or more current interference measurement resource configurations, a rate matching indication is included in the current interference measurement resource configuration for the wireless device (optional block 254), wherein the rate matching indication indicates rate matching of the physical downlink channel around the second plurality of REs. In some embodiments, the method 200 may further include: a rate matching indication is included in an interference measurement resource configuration for the wireless device (optional block 254), wherein the rate matching indication indicates rate matching of the physical downlink channel around the second plurality of REs. As used herein, "transmitting a physical downlink channel" on a particular set of resource elements is synonymous with transmitting a message carried by the physical downlink channel on the particular set of resource elements.
Note that the above-described apparatus may perform the methods herein and any other processes by implementing any functional apparatus, module, unit or circuit. For example, in one embodiment, the apparatus includes corresponding circuitry or circuitry configured to perform the steps shown in the method diagrams. In this regard, the circuitry or circuitry may comprise circuitry dedicated to performing certain functional processes and/or one or more microprocessors in conjunction with a memory. For example, the circuitry may include one or more microprocessors or microcontrollers, as well as other digital hardware, which may include Digital Signal Processors (DSPs), dedicated digital logic, and the like. The processing circuitry may be configured to execute program code stored in memory, which may include one or more types of memory, such as Read Only Memory (ROM), random access memory, cache memory, flash memory devices, optical storage devices, and the like. In some embodiments, program code stored in memory may include program instructions for performing one or more telecommunications and/or data communications protocols, as well as instructions for performing one or more of the techniques described herein. In an embodiment where memory is deployed, the memory stores program code that, when executed by the one or more processors, employs techniques described herein.
For example, fig. 9 illustrates a
Fig. 10 shows a schematic block diagram of a
Fig. 11 illustrates a
Fig. 12 shows a schematic block diagram of a wireless device 600 in a wireless network (e.g., the wireless network shown in fig. 13) according to other embodiments. As shown, the network node 600 implements various functional means/units or modules, e.g. via the
Those skilled in the art will also appreciate that embodiments herein also include corresponding computer programs.
The computer program comprises instructions which, when executed on at least one processor of the apparatus, cause the apparatus to perform any of the respective processes described above. In this regard, the computer program may comprise one or more code modules corresponding to the means or elements described above.
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