Power efficient communication with wireless smart repeater
A smart repeater (SMR) can be configured to amplify and forward data from a base station based on received control information for managing power efficiency of on-off operations. The SMR can configure a power control mechanism based on the control information to adapt one or more bandwidths associated with the SMR based on the control information to save power and forward the communications to the base station or the UE. The control information can include a component carrier (CC) index or a bandwidth part (BWP) identifier (ID), and a set of parameters to configure on-off operations of the one or more bandwidths according to one or more CCs or BWPs.
1 . A smart repeater (SMR), comprising:
a memory; and
a processing circuitry configured to, when executing instructions stored in the memory, cause the SMR to:
receive control information to manage power efficiency of a communication with a base station or a user equipment (UE), wherein the control information is received using a first beam and comprises an aggregation of different DCI bandwidth indicator fields of a plurality of SMRs that enable bandwidth adaptation among the plurality of SMRs, and at least one of: a component carrier (CC) index, a bandwidth part (BWP) identifier (ID), or a set of parameters to configure on-off operations of one or more bandwidths;
configure, based on the control information, a power control mechanism for transmission of the communication, wherein the power control mechanism includes bandwidth adaptation comprising transmission of the communication using a second beam that is narrower than the first beam; and
perform the communication with the base station or the UE using the second beam.
2 . The SMR of claim 1 , wherein the processing circuitry is further configured to:
in response to the control information comprising the CC index, perform the on-off operations based on a carrier aggregation of two or more CCs associated with different CC indices including the CC index, wherein the set of parameters include at least one of: an absolute radio frequency channel number (ARFCN), a CC bandwidth, or other frequency information for downlink communication and uplink communication.
3 . The SMR of claim 2 , wherein the processing circuitry is further configured to:
determine a CC of the two or more CCs as an SMR-default CC to be always powered on through the on-off operations with other CCs of the two or more CCs, wherein the SMR-default CC is determined based on an explicit indication of the CC, or an implicit indication of the CC based on a CC index or based on a successful cell search operation.
4 . The SMR of claim 1 , wherein the processing circuitry is further configured to:
in response to the control information comprising the BWP ID, perform the on-off operations, based on a plurality of BWPs, wherein the set of parameters includes at least one of: an absolute radio frequency channel number (ARFCN), a BWP bandwidth, or other frequency information for downlink communication and uplink communication.
5 . The SMR of claim 4 , wherein the processing circuitry is further configured to:
determine a BWP of the plurality of BWPs as an SMR-default BWP to be always powered on through the on-off operations with other BWPs of the plurality of BWPs, wherein the SMR-default BWP is determined based on an explicit indication of the BWP, or an implicit indication of the BWP that is based on a BWP index or based on a successful cell search operation.
6 . The SMR of claim 1 , further comprising:
an SMR Mobile Termination (SMR-MT) component configured to process data of a user-plane protocol layer via a backhaul link between the SMR and the base station;
an SMR Base Station (SMR-BS) component configured to process data of the user-plane protocol layer via an access link between the SMR and the UE; and
an SMR control unit (SMR-CU) component configured to receive the control information at a control-plane protocol layer for performing the on-off operations by activating/deactivating CCs or BWPs on the backhaul link and the access link, wherein an SMR-default CC of the CCs or an SMR-default BWP of the BWPs is always activated.
7 . The SMR of claim 1 , wherein the processing circuitry is further configured to:
activate and deactivate one or more SMR-CCs or one or more SMR-BWPs based on a medium access control (MAC) control element (MAC-CE), wherein the MAC CE is identified by a MAC sub-header with a dedicated logical channel ID (LCID) having a fixed size and comprises one or more fields that include a cell index associated with an SMR-CC of the one or more SMR-CCs or a BWP index associated with an SMR-BWP of the one or more SMR-BWPs indicating whether to deactivate the SMR-CC or the SMR-BWP.
8 . The SMR of claim 1 , wherein the processing circuitry is further configured to:
activate and deactivate one or more SMR-CCs or one or more SMR-BWPs based on a downlink control information (DCI) format of the control information, wherein a cyclic redundancy check (CRC) of the DCI format is scrambled based on a dedicated radio network temporary identifier (RNTI), or an identifier field in the DCI format comprises a predetermined value that identifies the DCI format.
9 . The SMR of claim 8 , wherein the processing circuitry is further configured to:
configure a search space set for monitoring the DCI format based on search space set parameters, a control channel element (CCE) aggregation level (AL) and candidates of the CCE AL, wherein the CCE AL is predetermined and the search space set parameters comprise a periodicity, an offset and a control resource set (CORESET), and wherein a time-domain location of the CORESET is limited to be within a predefined number of first symbols in a slot, a frequency location is limited to be within a bandwidth range of an SMR-default CC (SMR-DCC), or an SMR-default BWP (SMR-DBWP), or an explicit indication by an absolute radio frequency channel number (ARFCN).
10 . The SMR of claim 1 , wherein the control information comprises a bandwidth indicator field comprising one or more SMR-CC fields or SMR-BWP fields to trigger a CC based power control mechanism or a BWP based power control mechanism, wherein a location of the bandwidth indicator field for each SMR of the plurality of SMRs is indicated by higher layer signaling.
11 . The SMR of claim 1 , wherein the processing circuitry is further configured to:
in response to receiving a discontinuous reception (DRX) trigger signal, configuring a DRX monitoring cycle comprising a DRX active mode and a DRX inactive mode, and monitoring downlink communication only in the DRX active mode based on a set of DRX parameters comprising at least one of: a DRX cycle periodicity or one or more offset values; and
powering off or entering a sleep mode to not monitor one or more CCs during the DRX inactive mode of the DRX monitoring cycle except for any symbols or slots being reserved by an indication of the DRX trigger signal.
12 . The SMR of claim 11 , wherein the processing circuitry is further configured to:
in response to the indication of the DRX trigger signal indicating one or more symbols or slots for a transmission of an SMR synchronous signal block (SMR-SSB) or an SMR channel state information reference signal (SMR-CSI-RS), or comprising a bitmap corresponding to the one or more symbols/slots, enabling a transmission or a reception during the DRX monitoring cycle based on the indication.
13 . The SMR of claim 12 , wherein the DRX trigger signal is configured to control the DRX monitoring cycle in a DCI format for one or more SMRs based on subsets of CCs of a plurality of CCs or a BWP based on at least one bit of the bitmap, wherein the DRX trigger signal in a DCI is configured with a DRX monitoring occasion for the DRX monitoring cycle and the DRX monitoring occasion is configured by RRC signaling prior to a first slot of the DRX monitoring cycle.
14 . The SMR of claim 11 , wherein the DRX trigger signal comprises an SMR channel state information reference signal (SMR-CSI RS) that configures tracking reference signal (TRS) or CSI-RS resources in a DRX monitoring occasion, a set of reserved TRS sequences, or a TRS sequence with an orthogonal cover code (OCC) to indicate activation or deactivation of at least one of: a subset of CCs of a plurality of CCs or one or more BWPs for one or more SMRs.
15 . The SMR of claim 11 , wherein the DRX trigger signal is based on a binary phase shift keying (BPSK) M sequence that configures carrier frequency checking and indicates activation or deactivation of at least one of: a subset of CCs of a plurality of CCs or one or more BWPs for one or more SMRs, wherein an M sequence of the BPSK M sequence is based on a number of resource elements (REs) mapped to the DRX trigger signal and at least one of: an SMR-CC group index or a BWP index.