# US 12,114,304 B2 · Medium access control (MAC) control element signaling for multi-transmission point/multi panel physical downlink shared channel transmission

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- Number: US 12,114,304 B2
- Document ID: US12114304B2
- Status: Granted
- Kind: B2
- Application number: 17/426,022
- Filed: 2020-01-30
- Published: 2022-06-16
- Granted: 2024-10-08
- Earliest claimed: 2019-02-01
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Siva Muruganathan; Helka-Liina Määttanen; Mattias Frenne; Shiwei Gao
- Web page: https://patentgrep.com/patent/US12114304B2

## CPC

- H04L 5/0016: {Time-frequency-code}
- H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04W 80/02: Data link layer protocols
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method, wireless device and network node are disclosed. According to one embodiment, a network node is configured to transmit within a medium access control, MAC, control element, CE, message, an indication of a plurality KJ of Transmission Configuration Indication, TCI, states that are mapped to a single codepoint, j, in a downlink control information, DCI, Transmission Configuration Indication, TCI, field, Kj and j being integers, and transmit within the MAC CE message, the number Kj of TCI states being mapped to the codepoint j. In another embodiment, a wireless device is configured to receive within a MAC CE message from the network node, an indication of a plurality Kj of TCI states that are mapped to a single codepoint, j, in a DCI TCI field, and receive within the MAC CE message, the number Kj of TCI states mapped to the codepoint j.

## Claims

### Claim 1

A method implemented in a network node, the method comprising:
transmitting within a medium access control (MAC) control element (CE) message, to a wireless device(WD) an indication of a plurality Kj of Transmission Configuration Indication(TCI) states that are mapped to a single codepoint, j, of a plurality of codepoints in a downlink control information(DCI) TCI field of a DCI, Kj and j being integers; and
transmitting within the MAC CE message, to the wireless device, the number Kj of TCI states being mapped to the single codepoint j, for each single codepoint j in the plurality of codepoints, the number Kj of TCI states has a value from a plurality of possible values, the DCI including an antenna ports field, the antenna ports field including an indication of at least one demodulation reference signal (DMRS) port usable by the WD to select a TCI state.

### Claim 2 (depends on 1)

The method of claim 1, wherein j is an integer in a set of integers {0, 1, 2, . . . , N} and there is a plurality of N+1 codepoints in the DCI TCI field.

### Claim 3 (depends on 1)

The method of claim 1, wherein TCI states represented by non-consecutive fields in the MAC CE are assigned to the single codepoint j in the DCI TCI field.

### Claim 4 (depends on 1)

The method of claim 1, wherein the MAC CE message is identified by a MAC packet data unit (PDU) subheader having a first logical channel identity (LCID), the first LCID being different from a second LCID, the second LCID being used to identify TCI state at least one of activation and deactivation for a WD-specific physical downlink shared channel (PDSCH) MAC CE as defined in Third Generation Partnership Project (3GPP) Release 15.

### Claim 5

A network node configured to communicate with a wireless device, WD, the network node comprising processing circuitry, the processing circuitry configured to cause the network node to:
transmit within a medium access control (MAC) control element (CE) message, to a wireless device (WD) an indication of a plurality Kj of Transmission Configuration Indication, TCI, (TCI) states that are mapped to a single codepoint, j, of a plurality of codepoints in a downlink control information (DCI) TCI field of a DCI, Kj and j being integers; and
transmit within the MAC CE message, to the wireless device, the number Kj of TCI states being mapped to the single codepoint j, for each single codepoint j in the plurality of codepoints, the number Kj of TCI states has a value from a plurality of possible values, the DCI including an antenna ports field, the antenna ports field including an indication of at least one demodulation reference signal (DMRS) port usable by the WD to select a TCI state.

### Claim 6 (depends on 5)

The network node of claim 5, wherein j is an integer in a set of integers {0, 1, 2, . . . , N} and there is a plurality of N+1 codepoints in the DCI TCI field.

### Claim 7 (depends on 5)

The network node of claim 5, wherein TCI states represented by non-consecutive fields in the MAC CE are assigned to the single codepoint j in the DCI TCI field.

### Claim 8 (depends on 5)

The network node of claim 5, wherein the MAC CE message is identified by a MAC packet data unit (PDU) subheader having a first logical channel identity (LCID), the first LCID being different from a second LCID, the second LCID being used to identify TCI state at least one of activation and deactivation for a WD-specific physical downlink shared channel (PDSCH) MAC CE as defined in Third Generation Partnership Project (3GPP) Release 15.

### Claim 9

A method implemented in a wireless device, (WD) the method comprising:
receiving within a medium access control (MAC) control element (CE) message, from a network node, an indication of a plurality Kj of Transmission Configuration Indication (TCI) states that are mapped to a single codepoint, j, of a plurality of codepoints in a downlink control information (DCI) TCI field of a DCI, Kj and j being integers; and
receiving within the MAC CE message, from the network node, the number Kj of TCI states being mapped to the single codepoint j and for each single codepoint j in the plurality of codepoints, the number Kj of TCI states has a value from a plurality of possible values; and
selecting a TCI state based on an indication of at least one demodulation reference signal (DMRS) port in an antenna ports field in the DCI.

### Claim 10 (depends on 9)

The method of claim 9, wherein j is an integer in a set of integers {0, 1, 2, . . . , N} and there is a plurality of N+1 codepoints in the DCI TCI field.

### Claim 11 (depends on 9)

The method of claim 9, wherein TCI states represented by non-consecutive fields in the MAC CE are assigned to the single codepoint j in the DCI TCI field.

### Claim 12 (depends on 9)

The method of claim 9, wherein the MAC CE message is identified by a MAC packet data unit (PDU) subheader having a first logical channel identity (LCID), the first LCID being different from a second LCID, the second LCID being used to identify TCI state at least one of activation and deactivation for a WD-specific physical downlink shared channel (PDSCH) MAC CE as defined in Third Generation Partnership Project (3GPP) Release 15.

### Claim 13

A wireless device (WD) configured to communicate with a network node, the wireless device comprising processing circuitry, the processing circuitry configure to cause the wireless device to:
receive within a medium access control (MAC) control element (CE) message, from the network node, an indication of a plurality Kj of Transmission Configuration Indication (TCI) states that are mapped to a single codepoint, j, of a plurality of codepoints in a downlink control information (DCI) TCI field of a DCI, Kj and j being integers;
receive within the MAC CE message, from the network node, the number Kj of TCI states being mapped to the single codepoint j and for each single codepoint j in the plurality of codepoints, the number Kj of TCI states has a value from a plurality of possible values; and
select a TCI state based on an indication of at least one demodulation reference signal (DMRS) port in an antenna ports field in the DCI.

### Claim 14 (depends on 13)

The wireless device of claim 13, wherein j is an integer in a set of integers {0, 1, 2, . . . , N} and there is a plurality of N+1 codepoints in the DCI TCI field.

### Claim 15 (depends on 13)

The wireless device of claim 13, wherein TCI states represented by non-consecutive fields in the MAC CE are assigned to the single codepoint j in the DCI TCI field.

### Claim 16 (depends on 13)

The wireless device of claim 13, wherein the MAC CE message is identified by a MAC packet data unit (PDU) subheader having a first logical channel identity, LCID (LCID), the first LCID being different from a second LCID, the second LCID being used to identify TCI state at least one of activation and deactivation for a WD-specific physical downlink shared channel (PDSCH) MAC CE as defined in Third Generation Partnership Project (3GPP) Release 15.

### Claim 17 (depends on 2)

The method of claim 2, wherein TCI states represented by non-consecutive fields in the MAC CE are assigned to the single codepoint j in the DCI TCI field.

### Claim 18 (depends on 2)

The method of claim 2, wherein the MAC CE message is identified by a MAC packet data unit(PDU) subheader having a first logical channel identity (LCID), the first LCID being different from a second LCID, the second LCID being used to identify TCI state at least one of activation and deactivation for a WD-specific physical downlink shared channel (PDSCH) MAC CE as defined in Third Generation Partnership Project (3GPP) Release 15.