Enhancements for reduced capability new radio devices
A user equipment (UE) is configured to receive a system information block (SIB) from a base station and transmit an indication of a reduced capability (redcap) device type to the base station during a random access procedure, wherein the indication is associated with a UE configuration comprising one or more UE complexity reduction features.
1 . A processor of a user equipment (UE) configured to perform operations comprising:
receiving a system information block (SIB) from a base station, wherein a first bit of the SIB is configured to indicate whether a redcap device type equipped with a single receive (RX) antenna branch is barred for cell access by the base station and a second bit of the SIB is configured to indicate whether a redcap device type equipped with two RX antenna branches is barred for cell access by the base station; and
generating, for transmission to the base station during a random access procedure, an indication of a redcap device type, wherein the indication is associated with a UE configuration comprising one or more UE complexity reduction features.
2 . The processor of claim 1 , wherein the one or more UE complexity reduction features associated with the indication comprises only a reduced maximum bandwidth.
3 . The processor of claim 1 , the operations further comprising:
reporting, after transmitting the indication of the redcap device type, UE capability information comprising further UE complexity reduction features.
4 . The processor of claim 1 , wherein the SIB includes an information element (IE) indicating whether the redcap device type is barred for cell access by the base station.
5 . The processor of claim 1 , wherein the SIB indicates that an initial uplink bandwidth part (BWP) is to be shared by redcap devices and non-redcap devices.
6 . The processor of claim 5 , wherein the initial uplink BWP comprises a set of dedicated redcap random access channel (RACH) occasions (ROs) and a set of dedicated non-redcap ROs multiplexed in a frequency division multiplex (FDM) manner.
7 . The processor of claim 6 , where the SIB includes one or more information elements (IEs) indicating a frequency location of the dedicated redcap ROs within the initial uplink BWP.
8 . The processor of claim 6 , the operations further comprising:
determining a frequency location of the dedicated redcap ROs within the initial uplink BWP based on a resource block (RB) offset value, wherein the SIB includes an information element (IE) indicating the resource block (RB) offset value relative to a starting RB of the dedicated non-redcap ROs.
9 . The processor of claim 6 , wherein a single information element (IE) provides an indication of a number of ROs in the set of dedicated redcap ROs and a number of ROs in the set of dedicated non-redcap ROs.
10 . The processor of claim 5 , wherein the initial uplink BWP comprises a set of dedicated redcap random access channel (RACH) occasions (ROs) and a set of dedicated non-redcap ROs multiplexed in a time division multiplex (TDM) manner.
11 . The processor of claim 10 , wherein the SIB includes an information element (IE) indicating a physical random access channel (PRACH) configuration index value specific to the redcap device type.
12 . The processor of claim 10 , wherein the SIB includes an information element (IE) indicating a physical random access channel (PRACH) configuration index value that is to be applied by both redcap UEs and non-redcap UEs and wherein the SIB further includes an IE indicating an offset value for determining a time domain location of the dedicated redcap ROs.
13 . The processor of claim 5 , wherein the initial uplink BWP comprises one or more random access channel (RACH) occasions that are to be shared by redcap UEs and non-redcap UEs, each of the one or more ROs comprising a set of dedicated redcap preambles and a set of dedicated non-redcap preambles.
14 . The processor of claim 13 , wherein the SIB includes an information element (IE) indicating a total number of preambles assigned for redcap device type contention based random access and contention free random access.
15 . The processor of claim 13 , wherein the set of dedicated redcap preambles is configured in three separate groups and wherein the SIB comprises one or more information element (IEs) indicating a number of preambles in a first group, a number of preambles in a second group, a number of synchronization signal blocks (SSBs) per RO and a number of contention based preambles per SSB.
16 . The processor of claim 13 , wherein the set of dedicated redcap preambles comprises a number of preambles dedicated for a redcap UE operating in coverage enhancement (CE) mode.
17 . The processor of claim 1 , wherein the indication of the redcap device type is a unique logical channel ID (LCID) provided as part of message 3 (Msg3).
18 . A user equipment (UE), comprising:
a transceiver configured to communicate with a base station; and
a processor communicatively coupled to the transceiver and configured to perform operations comprising:
receiving a system information block (SIB) from the base station, wherein a first bit of the SIB is configured to indicate whether a redcap device type equipped with a single receive (RX) antenna branch is barred for cell access by the base station and a second bit of the SIB is configured to indicate whether a redcap device type equipped with two RX antenna branches is barred for cell access by the base station; and
transmitting an indication of a redcap device type to the base station during a random access procedure, wherein the indication is associated with a UE configuration comprising one or more UE complexity reduction features.