Coverage enhancement for reduced capability new radio devices
Blind coverage for wireless devices is enhanced varying one or more transmission characteristics of a repeated transmission sent or received by apparatuses, where the repeated transmission includes, for example a Physical Downlink Shared CHannel (PDSCH) and/or a Physical Uplink Shared CHannel (PUSCH) transmissions. Varied characteristics may include a start time for each repetition, a duration for each repetition, a start frequency for each repetition, a bandwidth of each repetition, a number of repetitions for each subframe, and/or a number of repetitions for each slot. Repetitions may be within a Bandwidth Part (BWP) or span multiple BWPs. Repetitions may vary from one to another in start time, start frequency, duration, bandwidth, and slot and subframe patterns. Higher level signalling, such as Radio Resource Control (RRC) signalling may be used to control the inclusion or omission of a DeModulation Reference Signal (DMRS) in repeated transmissions.
1. A wireless transmit/receive unit (WTRU) comprising a processor and memory storing instructions that, when executed by the processor, cause the WTRU to perform operations comprising:
receiving a first message comprising first information indicating one or more sequences of starting frequencies for a plurality of bandwidth parts (BWPs);
receiving a second message comprising second information indicating one of the one or more sequences of starting frequencies for a first BWP of the plurality of BWPs;
transmitting one or more physical uplink shared channel (PUSCH) repetitions or receiving one or more physical downlink shared channel (PDSCH) repetitions at a first frequency within the first BWP based on a first starting frequency of the indicated one of the one or more sequences of starting frequencies;
switching the first starting frequency of the first BWP to a second starting frequency of the indicated one of the one or more sequences of starting frequencies, wherein a second BWP is based on the second starting frequency; and
transmitting one or more additional PUSCH repetitions or receiving one or more additional PDSCH repetitions at a second frequency within the second BWP.
2. The WTRU of claim 1 , wherein switching the first starting frequency of the first BWP to the second starting frequency of the second BWP is performed after a number of repetitions have been transmitted or received.
3. The WTRU of claim 1 , wherein switching the first starting frequency of the first BWP to the second starting frequency of the second BWP is performed after a number of slots.
4. The WTRU of claim 1 , wherein an identifier is associated with the first BWP, and wherein the identifier associated with the first BWP does not change when the first starting frequency of the first BWP is switched from the first starting frequency to the second starting frequency.
5. The WTRU of claim 1 , wherein the one or more sequences of starting frequencies for the plurality of BWPs are received via radio resource control (RRC) signaling.
6. The WTRU of claim 1 , wherein the indication of the one of the one or more sequences of starting frequencies is received via one of: a medium access control (MAC) control element (CE), a downlink control information (DCI), or a group-common physical downlink control channel (GC-PDCCH).
7. The WTRU of claim 1 , wherein each of the one or more sequences of starting frequencies for the plurality of BWPs is specified as a sequence of offsets relative to a first resource block allocated for each BWP of the plurality of BWPs.
8. The WTRU of claim 1 , wherein the one or more sequences of starting frequencies for the plurality of BWPs are indicated via a sequence of location and bandwidth parameters.
9. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
receiving a first message comprising first information indicating one or more sequences of starting frequencies for a plurality of bandwidth parts (BWPs);
receiving a second message comprising second information indicating one of the one or more sequences of starting frequencies for a first BWP;
transmitting one or more physical uplink shared channel (PUSCH) repetitions or receiving one or more physical downlink shared channel (PDSCH) repetitions at a first frequency within the first BWP based on a first starting frequency of the indicated one of the one or more sequences of starting frequencies;
switching the first starting frequency of the first BWP to a second starting frequency of the one of the one or more indicated sequences of starting frequencies, wherein a second BWP is based on the second starting frequency; and
transmitting one or more additional PUSCH repetitions or receiving one or more additional PDSCH repetitions at a second frequency within the second BWP.
10. The method of claim 9 , wherein switching the first starting frequency of the first BWP to the second starting frequency of the second BWP is performed after a number of repetitions have been transmitted or received.
11. The method of claim 9 , wherein switching the first starting frequency of the first BWP to the second starting frequency of the second BWP is performed after a number of slots.
12. The method of claim 9 , wherein an identifier is associated with the first BWP, and wherein the identifier associated with the first BWP does not change when the first starting frequency of the first BWP is switched from the first starting frequency to the second starting frequency.
13. The method of claim 9 , wherein the one or more sequences of starting frequencies for the plurality of BWPs are received via radio resource control (RRC) signaling.
14. The method of claim 9 , wherein the indication of the one of the one or more sequences of starting frequencies is received via one of: a medium access control (MAC) control element (CE), a downlink control information (DCI), or a group-common physical downlink control channel (GC-PDCCH).
15. The method of claim 9 , wherein each of the one or more sequences of starting frequencies for the plurality of BWPs is specified as a sequence of offsets relative to a first resource block allocated for each BWP of the plurality of BWPs.
16. The method of claim 9 , wherein the one or more sequences of starting frequencies for the plurality of BWPs are indicated via a sequence of location and bandwidth parameters.