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EP-4742582-A2 - DOWNLINK CONTROL CHANNEL IN WIRELESS SYSTEMS

EP4742582A2EP 4742582 A2EP4742582 A2EP 4742582A2EP-4742582-A2

Abstract

Systems, methods, and instrumentalities may be disclosed for implementing a flexible radio access communication system. A flexible radio access communication system may be supported using spectrum of varying size, including aggregation of non-adjacent carriers in the same and/or in different frequency bands. A wireless transmit/receive unit (WTRU) may receive a first transmission via a common downlink control channel. The first transmission may include first control information. The first control information may include information regarding the configuration of a first dedicated downlink control channel of one or more dedicated control channels. The WTRU may receive a second transmission via the first dedicated downlink control channel of the dedicated control channels. The second transmission may include second control information. The second control information may be associated with a transmission of a first transmission type. The dedicated downlink control channels may be used for providing control information associated with different types of transmissions.

Inventors

  • LEE, MOON-IL
  • MARINIER, PAUL
  • PANI, DIANA
  • PELLETIER, BENOIT
  • PELLETIER, GHYSLAIN
  • RUDOLF, MARIAN

Assignees

  • InterDigital Patent Holdings, Inc.

Dates

Publication Date
20260513
Application Date
20160825

Claims (15)

  1. A wireless transmit/receive unit, WTRU, comprising: a processor configured to: receive configuration information via first downlink control information, DCI, wherein the configuration information indicates one or more search spaces to monitor, and wherein the one or more search spaces comprises one or more control channel, CC, candidates; monitor the one or more search spaces based on the configuration information received in the first DCI; and receive a second DCI via the one or more search spaces that were monitored based on the configuration information received in the first DCI.
  2. The WTRU of claim 1, wherein the first DCI comprises a bit field, and wherein the bit field indicates the one or more search spaces to monitor.
  3. The WTRU of any of claims 1-2, wherein the processor is configured to determine the one or more CC candidates based on one or more of a reference signal type, a time resource, a frequency resource, a WTRU capability, a service type, a WTRU category, a traffic type, or the one or more search spaces.
  4. The WTRU of any of claims 1-3, wherein the processor is configured to decode the one or more search spaces.
  5. The WTRU of any of claims 1-4, wherein the one or more search spaces is a subset of a plurality of search spaces.
  6. The WTRU of any of claims 1-5, wherein the processor is configured to receive the first DCI based on a radio network temporary identifier, RNTI, that is associated with the first DCI.
  7. The WTRU of any of claims 1-6, wherein the processor is configured to monitor the one or more search spaces based on capability of the WTRU, an indication, or higher layer signaling.
  8. The WTRU of any of claims 1-7, wherein the processor is configured to report an indication of a received signal power level of each of the one or more search spaces, a preferred CC candidate index within each respective search space of the one or more search spaces, or a preferred search space of the one or more search spaces.
  9. The WTRU of any of claims 1-8, wherein the processor is configured to monitor the one or more search spaces based on a downlink control candidate index.
  10. The WTRU of any of claims 1-9, wherein the processor is configured to use each of the one or more search spaces in association with a service type or a traffic type.
  11. A method performed by a wireless transmit/receive unit, WTRU, the method comprising: receiving configuration information via first downlink control information, DCI, wherein the configuration information indicates one or more search spaces to monitor, and wherein the one or more search spaces comprises one or more control channel, CC, candidates; monitoring the one or more search spaces based on the configuration information received in the first DCI; and receiving a second DCI via the one or more search spaces that were monitored based on the configuration information received in the first DCI.
  12. The method of claim 11, wherein the first DCI comprises a bit field, and wherein the bit field indicates the one or more search spaces to monitor.
  13. The method of any of claims 11-12, further comprising determining the one or more CC candidates based on one or more of a reference signal type, a time resource, a frequency resource, a WTRU capability, a service type, a WTRU category, a traffic type, or the one or more search spaces.
  14. The method of any of claims 11-13, further comprising decoding the one or more search spaces.
  15. The method of any of claims 11-14, wherein the one or more search spaces is a subset of a plurality of search spaces.

Description

CROSS REFERENCE This application claims the benefit of U.S. Provisional Application No. 62/209,797 filed on August 25, 2015, which is incorporated herein by reference as if fully set forth. BACKGROUND Orthogonal frequency division multiplexing (OFDM) may be a signal format used for data transmissions in long term evolution (LTE) and IEEE 802.11 communication systems. OFDM may divide a spectrum into multiple parallel orthogonal subbands. A subcarrier may be shaped using a rectangular window in the time domain leading to sinc-shaped subcarriers in the frequency domain. OFDMA may benefit from frequency synchronization and tight management of uplink timing alignment within the duration of the cyclic prefix to maintain orthogonality between signals and to reduce inter-carrier interference. Such synchronization may not be well-suited in a system in which a wireless transmit/receive unit (WTRU) is connected to multiple access points simultaneously. Additional power reduction may be applied to uplink transmissions for compliance with spectral emission guidelines to adjacent bands, e.g., in the presence of aggregation of fragmented spectrum for the WTRU's transmissions. SUMMARY A wireless communication system may enable flexible spectrum usage, deployment strategies, and operation. A wireless/transmit receive unit (WTRU) and/or one or more base station devices/access points may be configured to utilize spectrum of varying size, for example including aggregation of non-adjacent carriers in the same and/or in different frequency bands (e.g., licensed or unlicensed), in order to implement a flexible radio access communication system. The WTRU and/or base station device may utilize one or more of narrowband and wideband transmissions in order to implement a flexible radio access communication system. A WTRU and/or base station device may utilize one or more (e.g., different) duplexing methods in order to implement a flexible radio access communication system. For time-division duplexing (TDD), the WTRU and/or base station device may utilize dynamically variable DL/UL allocation in order to implement a flexible radio access communication system. The WTRU and/or base station device may utilize variable TTI lengths in order to implement a flexible radio access communication system. The WTRU and/or base station device may utilize scheduled and unscheduled transmissions in order to implement a flexible radio access communication system. The WTRU and/or base station device may utilize synchronous and asynchronous transmissions in order to implement a flexible radio access communication system. The user plane may be separated from the control plane. The WTRU and/or base station device may utilize multi-node connectivity in order to implement a flexible radio access communication system. A WTRU and/or base station device may utilize resource elements in order to implement a flexible radio access communication system. Different types of resource elements may be defined, determined, and/or used. For example, resource elements (REs) may be defined, determined, and/or used. Different types of REs may be defined, determined, and/or used for different types of transmissions. Different types of REs may be defined, determined, and/or used based on one or more of a frequency space and/or a time length. A resource block (RB) may be defined, determined, and/or used. For example, an RB may comprise one or more resource elements. One or more (e.g., different) types of RBs may be defined, determined, and/or used, for example, for different types of transmissions. For example, one or more RB may be defined, determined, and/or used, depending on which types of one or more REs are comprised within the RB. Information relating to the determined RB type may be sent to a wireless transmit/receive unit (WTRU). For example, a WTRU may receive information relating to the determined RB type from a base state device. A WTRU and/or base station device may utilize flexible physical resource definition information in order to implement a flexible radio access communication system. For example, a WTRU may receive flexible physical resource definition information from a base station device. A WTRU may receive RE and/or RB definitions (e.g. RE and/or RB definitions with flexible structure) from a base state device. A WTRU may receive control channel resource unit definition information. For example, a WTRU may receive control resource element (CRE) and/or control resource element group (CREG) definition information in order to configure and/or implement a flexible radio access communication system. By using flexible resource definitions (e.g., CREs, CREGs, etc.), the WTRU may be configured to dynamically and/or semi-statically utilize different resource types, for example for different types of transmissions and/or transmission for different purposes/appellations/use cases. Different types of transmissions, such as using different waveform types and/or diffe