Beam failure recovery operation
Described is an apparatus of a User Equipment (UE) operable to communicate with a fifth-generation Evolved Node-B (gNB) on a wireless network. The apparatus may comprise a first circuitry, a second circuitry, and a third circuitry. The first circuitry may be operable to detect a beam failure event. The second circuitry may be operable to generate a beam failure recovery request for transmission to the gNB, in response to the beam failure event. The third circuitry my be operable to monitor for Physical Downlink Control Channel (PDCCH) in a search space configured by the gNB, subsequent to a transmission of the beam failure recovery request.
1. A User Equipment (UE) operable to communicate with a base station (BS) on a wireless network, comprising:
one or more processors configured to:
monitor measurements associated with a set of Reference Signal (RS) resources from two or more antenna ports, wherein the measurements comprise a block error rate (BLER) calculated based on a precoding cycling using a predefined codebook;
determine a beam failure event, based on the measurements; and
generate a beam failure recovery request for transmission to the BS, in response to the beam failure event; and
monitor a Physical Downlink Control Channel (PDCCH) in a search space configured by the BS, subsequent to a transmission of the beam failure recovery request; and
an interface for sending the beam failure recovery request to a transmission circuitry.
2. The UE of claim 1 , wherein:
the search space is configured using higher layer signaling.
3. The UE of claim 1 , wherein:
the search space is configured by the BS using a higher layer parameter.
4. The UE of claim 1 , wherein:
the PDCCH includes a beam failure recovery response.
5. The UE of claim 1 , wherein the one or more processors are configured to:
send the beam failure recovery request to the transmission circuitry, for transmission to the BS at a slot (n); and
monitor the PDCCH from a slot (n+K), where K is a predefined integer.
6. The UE of claim 1 , wherein the one or more processors are configured to:
send the beam failure recovery request to the transmission circuitry, for transmission to the BS at a slot (n); and
monitor the PDCCH from a slot (n+K), where K is a preconfigured integer.
7. The UE of claim 1 , wherein the beam failure event is associated with a failure of a first beam, and the one or more processors are further configured to:
process an RS in the set of RS resources that is received from the BS via a second beam different from the first beam;
determine a Reference Signal Receive Quality (RSRQ) or a Signal to Interference Noise Ratio (SINR) for the RS; and
identify the second beam for communication with the BS, in response to the RSRQ or the SINR being higher than a first threshold or a second threshold, respectively.
8. The UE of claim 1 , wherein the precoding cycling used to calculate the BLER comprises a precoding matrix indicator (PMI) or a rank indicator from the predefined codebook.
9. The UE of claim 1 , wherein the set of RS resources comprise a Channel State Information Reference Signal (CSI-RS), or a Synchronization Signal Block (SSB).
10. The UE of claim 1 , wherein the set of RS resources comprise a periodic Channel State Information-Reference Signal (CSI-RS).
11. The UE of claim 1 , wherein the set of RS resources comprise a periodic Channel State Information-Reference Signal (CSI-RS) or a Synchronization Signal Block (SSB), which are Quasi Co-Located (QCLed) with the PDCCH of a Control Resource Set (CORESET).
12. The UE of claim 1 , further comprising:
an application processor, a memory, one or more antennas, a wireless interface for allowing the application processor to communicate with another device, and a touch-screen display.
13. A non-transitory machine readable storage media having machine executable instructions that, when executed, cause one or more processors of a User Equipment (UE) operable to communicate with a base station (BS) on a wireless network to perform operations comprising:
monitoring measurements associated with a set of Reference Signal (RS) resources from two or more antenna ports, wherein the measurements comprise a block error rate (BLER) calculated based on a precoding cycling using a predefined codebook;
determining a beam failure event, based on the measurements associated with the set of RS resources;
generating a beam failure recovery request for transmission to the BS, in response to the beam failure event;
sending the beam failure recovery request to a transmission circuitry; and
monitoring a Physical Downlink Control Channel (PDCCH) in a search space configured by the BS.
14. The non-transitory machine readable storage media of claim 13 , wherein the search space is configured using a higher layer parameter.
15. The non-transitory machine readable storage media of claim 13 , wherein the operations further comprise:
sending the beam failure recovery request to the transmission circuitry, for transmission to the BS at a slot (n); and
monitoring the PDCCH from a slot (n+K) onwards, where K is a predefined integer or a preconfigured integer.
16. The non-transitory machine readable storage media of claim 13 , wherein:
the set of RS resources comprise a Channel State Information Reference Signal (CSI-RS).
17. A User Equipment (UE) operable to communicate with a base station (BS) on a wireless network, comprising:
one or more processors configured to:
determine a failure of a first beam based on measurements from two or more antenna ports, wherein the measurements comprise a block error rate (BLER) calculated based on a precoding cycling using a predefined codebook;
process one or more Reference Signals (RSes) received via a second beam different from the first beam, wherein the one or more RSes comprise a periodic Channel State Information-Reference Signal (CSI-RS);
determine a Reference Signal Receive Quality (RSRQ) or a Signal to Interference Noise Ratio (SINR) for the one or more RSes; and
identify the second beam for communication with the BS, in response to the RSRQ or the SINR being higher than a first threshold or a second threshold, respectively.
18. The UE of claim 17 , wherein to process the one or more RSes, the one or more processors are configured to:
process the periodic CSI-RS that are Quasi Co-Located (QCLed) with a Physical Downlink Control Channel (PDCCH) of a Control Resource Set (CORESET).
19. The UE of claim 17 , wherein the one or more RSes further comprise a Synchronization Signal Block (SSB) that is Quasi Co-Located (QCLed) with a Physical Downlink Control Channel (PDCCH) of a Control Resource Set (CORESET).
20. The UE of claim 17 , wherein the first threshold is associated with a 1-port CSI-RS and the second threshold is associated with a 2-port CSI-RS.