Systems, methods, and apparatuses for cross division duplex operation in wireless communication
Systems, methods, and apparatuses for cross division duplex (XDD) operation in a wireless communication system are described herein. A user equipment (UE) is configured with one or more sub-bands (SBs) within a larger overall bandwidth (BW) (e.g., represented by a component carrier (CC), a bandwidth part (BWP), etc.), and that use uplink (UL)/downlink (DL) resource allocation(s) that may be different than the larger BW. Configurations for such SB-specific (SBS) arrangements that use guard bands (GBs) between SBs are discussed. Mechanisms for slot format indications (SFIs) within such SBs using either SBS DCI or cross-SB DCI are discussed. Mechanisms for providing SBS uplink resource for initial access (e.g., random access) using at least one initial UL BWP that is configured relative to one or more SBs and that may be used by XDD-capable UEs are discussed.
1 . A method of a user equipment (UE), comprising:
receiving, from a network, sub-band (SB) configuration information identifying a plurality of frequency domain SBs that are useable by the UE to communicate with the network;
receiving, from the network, a bitmap comprising a plurality of bits each having a one-to-one correspondence with one of the plurality of frequency domain SBs, wherein each bit of the bitmap indicates whether a control resource set (CORESET) of its corresponding frequency domain SB of the plurality of frequency domain SBs is to be monitored for a downlink control information (DCI), wherein a first bit of the plurality of bits indicates that a first CORESET of a first frequency domain SB of the plurality of frequency domain SBs that corresponds to the first bit is to be monitored for the DCI;
monitoring for the DCI on the first CORESET of the first frequency domain SB in response to determining that the first bit of the plurality of bits indicates that the first CORESET of the first frequency domain SB of the plurality of frequency domain SBs that corresponds to the first bit is to be monitored for the DCI;
receiving, from the network, the DCI in the first CORESET of the first frequency domain SB of the plurality of frequency domain SBs, wherein the DCI provides slot format information for the plurality of frequency domain SBs; and
communicating with the network on the plurality of frequency domain SBs using slot formats for the plurality of frequency domain SBs determined using the slot format information for the plurality of frequency domain SBs.
2 . The method of claim 1 , wherein at least two of the plurality of frequency domain SBs are located on a same bandwidth part (BWP).
3 . The method of claim 1 , wherein the plurality of frequency domain SBs is located on a plurality of bandwidth parts (BWPs).
4 . The method of claim 1 , wherein the plurality of frequency domain SBs is located on a plurality of carriers of a plurality of serving cells.
5 . The method of claim 1 , wherein the DCI provides the slot format information for the plurality of frequency domain SBs in slot format indication (SFI) index fields corresponding to the plurality of frequency domain SBs, each SFI index field having an SFI index field value indicating slot format information for a corresponding SB of the plurality of frequency domain SBs.
6 . The method of claim 5 , further comprising receiving, from the network, for each of the plurality of frequency domain SBs:
a location of an SFI index field corresponding to said each frequency domain SB of the plurality of frequency domain SBs according to a DCI format of the DCI; and
one or more slot format combinations, each comprising:
one or more representative slot formats; and
a representative SFI index field value associated with the slot format combination.
7 . The method of claim 6 , further comprising:
locating an SFI index field for a selected frequency domain SB of the plurality of frequency domain SBs in the DCI using the location of the SFI index field for the selected frequency domain SB;
obtaining a first SFI index field value corresponding to the selected frequency domain SB from the SFI index field for the selected frequency domain SB;
identifying a first slot format combination of the one or more slot format combinations for the selected frequency domain SB by matching its representative SFI index field value to the first SFI index field value from the SFI index field for the selected frequency domain SB; and
determining one or more of the slot formats that is for the selected frequency domain SB according to the representative slot formats of the first slot format combination.
8 . The method of claim 1 , further comprising monitoring a Type3 physical downlink control channel (PDCCH) common search space (CSS) in the first frequency domain SB for the DCI, wherein the DCI is received in the Type3 PDCCH CSS.
9 . The method of claim 1 , wherein the DCI is a DCI format 2_0 that is used to notify the UE of the slot formats for the plurality of frequency domain SBs.
10 . The method of claim 1 , wherein the DCI comprises cyclic redundancy check (CRC) bits that are scrambled by a slot format indication radio network temporary identifier (SFI-RNTI).
11 . A method of a base station of a radio access network (RAN), comprising:
sending, to a user equipment (UE), sub-band (SB) configuration information identifying a plurality of frequency domain SBs of a serving cell that are useable by the UE to communicate with the network;
sending, to the UE, a bitmap comprising a plurality of bits each having a one-to-one correspondence with one of the plurality of frequency domain SBs, wherein each bit of the bitmap indicates whether a control resource set (CORESET) of its corresponding frequency domain SB of the plurality of frequency domain SBs is to be monitored by the UE for a downlink control information (DCI), wherein a first bit of the plurality of bits indicates that a first CORESET of a first frequency domain SB of the plurality of frequency domain SBs that corresponds to the first bit is to be monitored for the DCI;
sending, to the UE, the DCI in the first coreset of the first frequency domain SB of the plurality of frequency domain SBs, wherein the DCI provides slot format information for the plurality of frequency domain SBs; and
communicating with the UE on the plurality of frequency domain SBs using slot formats for the plurality of frequency domain SBs corresponding to the slot format information for the plurality of frequency domain SBs.
12 . The method of claim 11 , wherein the DCI provides the slot format information for the plurality of frequency domain SBs in SFI index fields corresponding to the plurality of frequency domain SBs, each SFI index field having an SFI index field value indicating slot format information for a corresponding frequency domain SB of the plurality of frequency domain SBs.
13 . The method of claim 12 , further comprising sending, to the UE, for each of the plurality of frequency domain SBs:
a location of an SFI index field corresponding to said each of the plurality of frequency domain SBs according to a DCI format of the DCI; and
one or more slot format combinations, each comprising:
one or more representative slot formats; and
a representative SFI index field value associated with the slot format combination.
14 . The method of claim 12 , wherein the DCI is sent in a Type3 physical downlink control channel (PDCCH) common search space (CSS) in the first frequency domain SB.
15 . The method of claim 11 , wherein at least two of the plurality of frequency domain SBs are located on a same bandwidth part (BWP).
16 . The method of claim 11 , wherein the plurality of frequency domain SBs is located on a plurality of bandwidth parts (BWPs).
17 . The method of claim 11 , wherein the plurality of frequency domain SBs is located on a plurality of carriers of a plurality of serving cells.
18 . The method of claim 11 , wherein the DCI is a DCI format 2_0 that is used to notify the UE of the slot formats for the plurality of frequency domain SBs.
19 . The method of claim 11 , wherein the DCI comprises cyclic redundancy check (CRC) bits that are scrambled by a slot format indication radio network temporary identifier (SFI-RNTI).