# US 2013/0155984 A1 · Method And An Apparatus For Providing Control Information For Multi-Carrier Uplink Transmission

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- Number: US 2013/0155984 A1
- Document ID: US20130155984A1
- Status: Published application
- Kind: A1
- Application number: 13/766,180
- Filed: 2013-02-13
- Published: 2013-06-20
- Earliest claimed: 2008-10-31
- Assignees: Interdigital Patent Holding, Inc.
- Inventors: Paul Marinier; Diana Pani; Benoit Pelletier; Christopher Cave; Lujing Cai
- Web page: https://patentgrep.com/patent/US20130155984A1

## CPC

- H04W 72/20: Control channels or signalling for resource management
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 27/2601: {Multicarrier modulation systems}
- H04W 52/365: {Power headroom reporting}
- H04W 52/38: TPC being performed in particular situations
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 52/286: {during data packet transmission, e.g. high speed packet access [HSPA]}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method and an apparatus for providing control information for multi-carrier uplink transmission are disclosed. A wireless transmit/receive unit (WTRU) may set a happy bit for enhanced dedicated channel (E-DCH) transmissions on each uplink carrier considering aggregated transmission capability over all uplink carriers. The happy bit is set to “unhappy” if the WTRU is transmitting as much scheduled data as allowed by a current serving grant, the WTRU has enough power available to transmit at a higher rate, and total E-DCH buffer status (TEBS) requires more than a pre-configured period to be transmitted with a current effective data rate aggregated over all uplink carriers. The WTRU may send scheduling information including power headroom measured on the anchor uplink carrier and/or power headroom measured on the supplementary uplink carrier. For power headroom measurements, the WTRU may initiate a short-lived dedicated physical control channel loop on the supplementary carrier.

## Claims

### Claim 1

A wireless transmit/receive unit (WTRU) for providing control information for multi-carrier uplink transmission, the WTRU comprising:
a processor configured to:
evaluate scheduling information for a plurality of uplink carriers independently,
trigger transmission of scheduling information associated with a first uplink carrier when a timer associated with the first uplink carrier expires, and
trigger transmission of scheduling information associated with a second uplink carrier when a timer associated with the second uplink carrier expires, wherein the timer associated with the first uplink carrier and the timer associated with the second uplink carrier have a same value.

### Claim 2 (depends on 1)

The WTRU of claim 1, wherein the timer associated with the first uplink carrier comprises a timer T_SING (Timer Scheduling Information—“Zero_Grant”).

### Claim 3 (depends on 1)

The WTRU of claim 1, wherein the timer associated with the first uplink carrier comprises a timer T_SIG (Timer Scheduling Information—different from “Zero_Grant”).

### Claim 4 (depends on 1)

The WTRU of claim 1, wherein the plurality of uplink carriers comprise an anchor uplink carrier and at least one supplementary uplink carrier, and the processor is configured to:
calculate a power headroom on the anchor uplink carrier (UPHA) as measured on the anchor uplink carrier; and
calculate a power headroom on a supplementary uplink carrier (UPHs) as measured on the supplementary uplink carrier.

### Claim 5 (depends on 4)

The WTRU of claim 4, wherein the UPHA is a ratio of a maximum WTRU transmission power and a dedicated physical control channel (DPCCH) code power on the anchor uplink carrier, and the UPHs is a ratio of the maximum WTRU transmission power and a DPCCH code power on the supplementary uplink carrier.

### Claim 6 (depends on 4)

The WTRU of claim 4, wherein processor is configured to:
send the scheduling information comprising the UPHA over the anchor uplink carrier, and
send the scheduling information comprising the UPHs over the supplementary uplink carrier.

### Claim 7 (depends on 4)

The WTRU of claim 4, wherein the power headroom calculation on the supplementary uplink carrier is triggered on at least one of conditions:
the UPHA becomes smaller than a pre-configured threshold;
a total E-DCH buffer status (TEBS) becomes larger than a pre-configured threshold;
a time required to empty a transmission buffer given a current grant;
hybrid automatic repeat request (HARQ) offset and a ratio of active HARQ processes is longer than a configured value;
a timer has expired;
scheduling information transmission is triggered on the anchor carrier; or
a grant on the anchor carrier is zero and data becomes available in a buffer.

### Claim 8 (depends on 1)

The WTRU of claim 1, wherein the processor is configured to:
send a measurement report on a condition that a power headroom is larger or smaller than a power headroom threshold, a TEBS is larger than a TEBS threshold value, and an E-DCH transport format combination index (E-TFCI) corresponding to an E-TFCI threshold value is in a supported or blocked state for a configured period of time.

### Claim 9

A method, implemented in a wireless transmit/receive unit (WTRU), for providing control information for multi-carrier uplink transmission, the method comprising:
evaluating scheduling information for a plurality of uplink carriers independently; and
triggering transmission of scheduling information associated with a first uplink carrier when a timer associated with the first uplink carrier expires; and
triggering transmission of scheduling information associated with a second uplink carrier when a timer associated with the second uplink carrier expires, wherein the timer associated with the first uplink carrier and the timer associated with the second uplink carrier have a same value.

### Claim 10 (depends on 9)

The method of claim 9, wherein the timer associated with the first uplink carrier comprises a timer T_SING (Timer Scheduling Information—“Zero_Grant”).

### Claim 11 (depends on 9)

The method of claim 9, wherein the timer associated with the first uplink carrier comprises a timer T_SIG (Timer Scheduling Information—different from “Zero_Grant”).

### Claim 12 (depends on 9)

The method of claim 9, wherein the plurality of uplink carriers comprise an anchor uplink carrier and at least one supplementary uplink carrier, the method further comprising: calculating a power headroom on the anchor uplink carrier (UPHA) as measured on the anchor uplink carrier; and
calculating a power headroom on a supplementary uplink carrier (UPHs) as measured on the supplementary uplink carrier.

### Claim 13 (depends on 12)

The method of claim 12, further comprising:
sending the scheduling information comprising the UPHA over the anchor uplink carrier; and
sending the scheduling information comprising the UPHs over the supplementary uplink carrier.

### Claim 14 (depends on 12)

The method of claim 12, wherein the UPHA is a ratio of a maximum WTRU transmission power and a dedicated physical control channel (DPCCH) code power on the anchor uplink carrier, and the UPHs is a ratio of the maximum WTRU transmission power and a DPCCH code power on the supplementary uplink carrier.

### Claim 15 (depends on 12)

The method of claim 12, wherein the power headroom calculation on the supplementary uplink carrier is triggered on at least one of conditions:
the UPHA becomes smaller than a pre-configured threshold;
a total E-DCH buffer status (TEBS) becomes larger than a pre-configured threshold;
a time required to empty a transmission buffer given a current grant;
hybrid automatic repeat request (HARQ) offset and a ratio of active HARQ processes is longer than a configured value;
a timer has expired;
scheduling information transmission is triggered on the anchor carrier; or
a grant on the anchor carrier is zero and data becomes available in a buffer.

### Claim 16 (depends on 9)

The method of claim 9, further comprising:
sending a measurement report on a condition that a power headroom is larger or smaller than a power headroom threshold, a TEBS is larger than a TEBS threshold value, and an E-DCH transport format combination index (E-TFCI) corresponding to an E-TFCI threshold value is in a supported or blocked state for a configured period of time.