EP-3342082-B1 - DOWNLINK CONTROL CHANNEL IN WIRELESS SYSTEMS

EP3342082B1EP 3342082 B1EP3342082 B1EP 3342082B1EP-3342082-B1

Inventors

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

Dates

Publication Date: 20260506
Application Date: 20160825

Claims (20)

A wireless transmit-receive unit, WTRU, comprising: a processor; and a receiver operatively coupled to the processor; the processor and receiver configured to: determine a first bandwidth region associated with a first subcarrier spacing and a first cyclic prefix, wherein the first bandwidth region is a subset of a system bandwidth and is used by the WTRU when initially accessing a cell associated with a base station; receive from the base station a common downlink control channel transmission within the first bandwidth region; receive from the base station configuration information related to a dedicated downlink control channel transmission associated with a second bandwidth region of the system bandwidth and related to a set of search spaces associated with the second bandwidth region, wherein the second bandwidth region is associated with a second subcarrier spacing and a second cyclic prefix, wherein the configuration information indicates that the second subcarrier spacing associated with the second bandwidth region is different from the first subcarrier spacing associated with the first bandwidth region, or that the second cyclic prefix associated with the second bandwidth region is different from the first cyclic prefix associated with the first bandwidth region; and monitor for the dedicated downlink control channel transmission transmitted by the base station in at least the set of search spaces associated with the second bandwidth region.
The WTRU of claim 1, wherein the configuration information related to the dedicated downlink control channel transmission is associated with any of: a waveform, a numerology, a resource element type, a resource block type, or a control channel type.
The WTRU of claim 2, wherein the numerology comprises any of: the second subcarrier spacing, a time symbol length, or the second cyclic prefix.
The WTRU of claim 1, wherein the processor and the receiver are further configured to monitor for the dedicated downlink control channel transmission in at least the set of search spaces based on an indication received via the common downlink control channel transmission.
The WTRU of claim 1, wherein each of the first and second bandwidth regions is associated with a respective set of contiguous physical resource blocks.
The WTRU of claim 1, wherein the configuration information indicates a time and frequency location of the dedicated downlink control channel transmission associated with the second bandwidth region.
The WTRU of claim 1, wherein the receiver is further configured to receive the dedicated downlink control channel transmission within the second bandwidth region.
The WTRU of claim 1, wherein the first and second bandwidth regions are each associated with a different numerology.
The WTRU of claim 1, wherein the configuration information is received using Radio Resource Control, RRC, signaling.
The WTRU of claim 1, wherein the configuration information indicates the set of search spaces associated with the second bandwidth region is different from a set of search spaces associated with the first bandwidth region.
The WTRU of claim 1, wherein the configuration information indicates that 1) the second subcarrier spacing associated with the second bandwidth region is different from the first subcarrier spacing associated with the first bandwidth region, and 2) the second cyclic prefix associated with the second bandwidth region is different from the first cyclic prefix associated with the first bandwidth region.
The WTRU of claim 1, wherein the processor and receiver are configured to: when monitoring for the dedicated downlink control channel transmission in at least the set of search spaces, attempt to decode or receive the dedicated downlink control channel transmission within the second bandwidth region.
A method implemented in a wireless transmit-receive unit, WTRU, for wireless communications, the method comprising: determining a first bandwidth region associated with a first subcarrier spacing and a first cyclic prefix, wherein the first bandwidth region is a subset of a system bandwidth and is used by the WTRU when initially accessing a cell associated with a base station; receiving from the base station a common downlink control channel transmission within the first bandwidth region; receiving from the base station configuration information related to: a dedicated downlink control channel transmission associated with a second bandwidth region of the system bandwidth and related to a set of search spaces associated with the second bandwidth region, wherein the second bandwidth region is associated with a second subcarrier spacing and a second cyclic prefix, wherein the configuration information indicates that the second subcarrier spacing associated with the second bandwidth region is different from the first subcarrier spacing associated with the first bandwidth region, or that the second cyclic prefix associated with the second bandwidth region is different from the first cyclic prefix associated with the first bandwidth region; and monitoring for the dedicated downlink control channel transmission transmitted by the base station in at least the set of search spaces associated with the second bandwidth region.
The method of claim 13, wherein the configuration information related to the dedicated downlink control channel transmission is associated with any of: a waveform, a numerology, a resource element type, a resource block type, or a control channel type.
A network element associated with a base station, the network element configured to: transmit to a wireless transmit-receive unit, WTRU, a common downlink control channel transmission within a first bandwidth region, wherein the first bandwidth region is a subset of a system bandwidth and is used by the WTRU when initially accessing a cell associated with the base station, wherein the first bandwidth region is associated with a first subcarrier spacing and a first cyclic prefix; transmit to the WTRU configuration information related to: a dedicated downlink control channel transmission associated with a second bandwidth region of the system bandwidth and related to a set of search spaces associated with the second bandwidth region, wherein the second bandwidth region is associated with a second subcarrier spacing and a second cyclic prefix, wherein the configuration information indicates any of: the second subcarrier spacing associated with the second bandwidth region is different from the first subcarrier spacing associated with the first bandwidth region, or the second cyclic prefix associated with the second bandwidth region is different from the first cyclic prefix associated with the first bandwidth region; and transmit to the WTRU the dedicated downlink control channel transmission within the second bandwidth region.
The network element of claim 15, wherein the configuration information related to the dedicated downlink control channel transmission is associated with any of: a waveform, a numerology, a resource element type, a resource block type, or a control channel type.
The network element of claim 16, wherein the numerology comprises any of: a subcarrier spacing, a time symbol length, or a cyclic prefix.
The network element of claim 15, wherein the network element is further configured to transmit an indication in the common downlink control channel transmission.
The network element of claim 15, wherein each of the first and second bandwidth regions is associated with a respective set of contiguous physical resource blocks.
The network element of claim 15, wherein the configuration information indicates a time and frequency location of the dedicated downlink control channel transmission associated with the second bandwidth region.

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. Document "PMCH on NCT", 3GPP Draft; R1-132871, by Huawei, published on 10 August 2013, discloses the transmission of two different downlink control channels. Document "ePDCCH search space design for localized/ distributed transmission" 3GPP Draft R1-123329, by Pantech, published on 5 August 2012 discloses concepts for ePDCCH search space design". 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