# US 7,613,157 B2 · Wireless communication method and apparatus for processing enhanced uplink scheduling grants

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- Number: US 7,613,157 B2
- Document ID: US7613157B2
- Status: Granted
- Kind: B2
- Application number: 11/477,279
- Filed: 2006-06-29
- Published: 2007-03-01
- Granted: 2009-11-03
- Earliest claimed: 2005-08-30
- Assignees: InterDigital Technology Corporation
- Inventors: Jung-Lin Pan; Stephen E. Terry; Guodong Zhang; Peter Shaomin Wang
- Web page: https://patentgrep.com/patent/US7613157B2

## CPC

- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/1268: of uplink data flows
- 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 and apparatus for processing enhanced uplink scheduling grants are disclosed. A wireless transmit/receive unit (WTRU) detects an absolute grant (AG) and a relative grant (RG). Once the WTRU detects an AG or a RG, a new serving grant (SG) is generated and a hybrid automatic repeat request process may be activated or deactivated depending on whether the received AG is a primary AG or a secondary AG, whether a scheduling mode is a primary AG mode or a secondary AG mode, whether an AG value is set to “INACTIVE” and whether a transmission time interval is 2 ms or 10 ms. A Node-B may send a secondary AG to the WTRU before switching from a primary AG mode to a secondary AG mode and may send the secondary AG only if there is no out-of-date secondary AG exists, which may be detected by implementing a time threshold.

## Claims

### Claim 1

A method for generating a serving grant (SG) at a wireless transmit/receive unit (WTRU), the method comprising:
receiving a scheduling grant at the WTRU;
the WTRU determining whether the scheduling grant is an absolute grant (AG) or a relative grant (RG);
on a condition that the scheduling grant is an AG, the WTRU determining whether the scheduling grant is a primary AG or a secondary AG; and
the WTRU updating an SG with an AG value carried by the scheduling grant on a condition that the scheduling grant is the primary AG.

### Claim 2 (depends on 1)

The method of claim 1 further comprising:
on a condition that the scheduling grant is an RG, the WTRU determining whether a scheduling mode is a primary AG mode; and
on a condition that the scheduling mode is not the primary AG mode, the WTRU waiting for a next transmission time interval (TTI).

### Claim 3 (depends on 2)

The method of claim 2 further comprising:
on a condition that the scheduling mode is the primary AG mode, the WTRU updating the SG based on the RG.

### Claim 4 (depends on 3)

The method of claim 3 wherein the RG is interpreted by the WTRU relative to a power ratio in a previous TTI for the same hybrid automatic repeat request (H-ARQ) process.

### Claim 5 (depends on 4)

The method of claim 4 wherein:
the RG indicates one of an UP command, a DOWN command, or a HOLD command,
on a condition that the RG indicates an UP command, the SG is generated by the WTRU by increasing a previous SG by a predetermined step size,
on a condition that the RG indicates a DOWN command, the SG is generated by the WTRU by decreasing the previous SG by the predetermined step size, and
on a condition that the RG indicates a HOLD command, the WTRU retains the previous SG.

### Claim 6 (depends on 1)

The method of claim 1 further comprising:
on a condition that the scheduling grant is the primary AG, the WTRU setting a scheduling mode to a primary AG mode.

### Claim 7 (depends on 1)

The method of claim 1 further comprising:
the WTRU determining whether an AG value of the scheduling grant is set to “inactive”, wherein the WTRU sets the SG to the AG value in the scheduling grant on a condition that the AG value is not set to “inactive.”

### Claim 8 (depends on 7)

The method of claim 7 further comprising:
the WTRU setting a scheduling mode to a secondary AG mode on a condition that the AG value is set to “inactive.”

### Claim 9 (depends on 7)

The method of claim 7 further comprising:
the WTRU determining whether a transmission time interval (TTI) is 10 ms or 2 ms; and
on a condition that the TTI is 10 ms, the WTRU activating all hybrid automatic repeat request (H-ARQ) processes and waiting for the next TTI.

### Claim 10 (depends on 9)

The method of claim 9 further comprising:
on a condition that the TTI is 2 ms, the WTRU determining whether an activation flag is set to “single” or “all”;
on a condition that the activation flag is set to “single”, the WTRU activating a corresponding H-ARQ process; and
on a condition that the activation flag is set to “all”, the WTRU activating all H-ARQ processes.

### Claim 11 (depends on 7)

The method of claim 7 further comprising:
on a condition that the AG value is set to “inactive”, the WTRU determining whether a transmission time interval (TTI) is 2 ms or 10 ms;
on a condition that the TTI is 2 ms, the WTRU determining whether an activation flag is set to “single” or “all”; and
on a condition that the activation flag is set to “single”, the WTRU deactivating a corresponding hybrid automatic repeat request (H-ARQ) process.

### Claim 12 (depends on 11)

The method of claim 11 further comprising:
on a condition that either the activation flag is set to “all” or the TTI is 10 ms, the WTRU determining whether a secondary E-DCH radio network temporary identifier (E-RNTI) is configured; and
on a condition that the secondary E-RNTI is not configured, the WTRU deactivating all H-ARQ processes.

### Claim 13 (depends on 12)

The method of claim 12 wherein on a condition that the secondary E-RNTI is configured, the method further comprising:
the WTRU setting the SG value based on the latest received AG value;
the WTRU activating all H-ARQ processes; and
the WTRU setting a scheduling mode to a secondary AG mode.

### Claim 14 (depends on 12)

The method of claim 12 wherein on a condition that the secondary E-RNTI is configured, the method further comprising:
the WTRU maintaining a current SG value;
the WTRU activating all H-ARQ processes; and
the WTRU setting a scheduling mode to a secondary AG mode.

### Claim 15 (depends on 1)

The method of claim 1 further comprising:
on a condition that the scheduling grant is not the primary AG, the WTRU determining whether the scheduling mode is a secondary AG mode; and
on a condition that the scheduling mode is the secondary AG mode, the WTRU setting the SG to the AG value in the scheduling grant.

### Claim 16 (depends on 15)

The method of claim 15 further comprising:
on a condition that the scheduling mode is not the secondary AG mode, the WTRU saving the AG value in the scheduling grant.

### Claim 17 (depends on 15)

The method of claim 15 wherein the WTRU receives a secondary AG from a serving radio link set (RLS) before switching the scheduling mode from a primary AG mode to the secondary AG mode.

### Claim 18 (depends on 17)

The method of claim 17 wherein the scheduling mode is switched by the WTRU on a condition that no out-of-date secondary AG exists.

### Claim 19 (depends on 18)

The method of claim 18 wherein the WTRU determines the existence of the out-of-date secondary AG by implementing a time threshold.

### Claim 20 (depends on 19)

The method of claim 19 wherein the time threshold is static.

### Claim 21 (depends on 19)

The method of claim 19 wherein the time threshold is dynamically adjusted by the WTRU based on a predetermined factor.

### Claim 22 (depends on 21)

The method of claim 21 wherein the predetermined factor includes at least one of a traffic condition change rate, an interference condition variation rate, or vehicle speed.

### Claim 23 (depends on 15)

The method of claim 15 further comprising:
the WTRU determining whether the AG value is set to “inactive”, and
the WTRU determining whether the scheduling mode is secondary AG mode on a condition that the AG value is not set to “inactive.”

### Claim 24 (depends on 1)

The method of claim 1 further comprising:
the WTRU determining whether an AG value of the scheduling grant is set to “inactive”;
on a condition that the AG value is set to “inactive”, the WTRU determining whether an activation flag is set to “single” or “all”;
on a condition that the activation flag is set to “single”, the WTRU determining whether a transmission time interval (TTI) is 2 ms or 10 ms; and
on a condition that the TTI is 2 ms, the WTRU deactivating a corresponding hybrid automatic repeat request (H-ARQ) process.

### Claim 25 (depends on 24)

The method of claim 24 further comprising:
on a condition that the activation flag is set to “all”, the WTRU determining whether a secondary E-DCH radio network temporary identifier (E-RNTI) is configured;
on a condition that the secondary E-RNTI is not configured, the WTRU determining whether the TTI is 2 ms or 10 ms; and
on a condition that the TTI is 2 ms, the WTRU deactivating all H-ARQ processes.

### Claim 26 (depends on 25)

The method of claim 25 wherein on a condition that the secondary E-RNTI is configured, the method further comprising:
the WTRU setting the SG based on the latest received AG value;
the WTRU activating all H-ARQ processes; and
the WTRU setting a scheduling mode to a secondary AG mode.

### Claim 27 (depends on 25)

The method of claim 25 wherein on a condition that the secondary E-RNTI is configured, the method further comprising:
the WTRU maintaining the current SG;
the WTRU activating all H-ARQ processes; and
the WTRU setting a scheduling mode to a secondary AG mode.

### Claim 28

A wireless transmit/receive unit (WTRU) for generating a serving grant (SG), the WTRU comprising:
a transceiver for receiving a scheduling grant;
a decoder for decoding the scheduling grant; and
an SG processor configured to:
update an SG with an absolute grant (AG) value carried by the received scheduling grant on a condition that the received scheduling grant is a primary AG,
determine whether a scheduling mode is a primary AG mode on a condition that the scheduling grant is a relative grant (RG), and
wait for a next transmission time interval (TTI) on a condition that it is determined that the scheduling mode is not the primary AG mode.

### Claim 29 (depends on 28)

The WTRU of claim 28 wherein the SG processor is configured to update the SG based on the RG on a condition that the received scheduling mode is the primary AG mode.

### Claim 30 (depends on 29)

The WTRU of claim 29 wherein the SG processor is configured to interpret the RG relative to a power ratio in a previous TTI for the same hybrid automatic repeat request (H-ARQ) process.

### Claim 31 (depends on 30)

The WTRU of claim 30 wherein the RG indicates one of an UP command, a DOWN command, or a HOLD command,
on a condition that the RG indicates an UP command, the SG processor is configured to generate the SG by increasing a previous SG by a predetermined step size,
on a condition that the RG indicates a DOWN command, the SG processor is configured to generate the SG by decreasing the previous SG by the predetermined step size, and
on a condition that the RG indicates a HOLD command, the SG processor is configured to maintain the previous SG.

### Claim 32 (depends on 28)

The WTRU of claim 28 wherein the SG processor is configured to:
determine whether a scheduling mode is a secondary AG mode on a condition that the scheduling grant is not a primary AG, and
set the SG to an AG value in the scheduling grant on a condition that the scheduling mode is a secondary AG mode.

### Claim 33 (depends on 32)

The WTRU of claim 32 wherein the SG processor is configured to save an AG value in the scheduling grant on a condition that the scheduling mode is not a secondary AG mode.

### Claim 34 (depends on 32)

The WTRU of claim 32 wherein the SG processor is configured to:
determine whether the AG value is set to “inactive”, and
determine whether the scheduling mode is secondary AG mode on a condition that the AG value is not set to “inactive.”

### Claim 35

A wireless transmit/receive unit (WTRU) for generating a serving grant (SG), the WTRU comprising:
a transceiver for receiving a scheduling grant:
a decoder for decoding the scheduling grant; and
an SG processor configured to:
update an SG with an absolute grant (AG) value carried by the received scheduling grant on a condition that the received scheduling grant is a primary AG,
determine whether an AG value of the scheduling grant is set to “inactive”, and
set the SG to the AG value in the scheduling grant on a condition that the AG value is not set to “inactive.”

### Claim 36 (depends on 35)

The WTRU of claim 35 wherein the SG processor is configured to set a scheduling mode to a secondary AG mode on a condition that the AG value is set to “inactive.”

### Claim 37 (depends on 35)

The WTRU of claim 35 wherein the SG processor is configured to:
determine whether a transmission time interval (TTI) is 10 ms or 2 ms, and
activate all hybrid automatic repeat request (H-ARQ) processes and wait for the next TTI on a condition that the TTI is 10 ms.

### Claim 38 (depends on 37)

The WTRU of claim 37 wherein the SG processor is configured to:
determine whether the TTI is 2 ms or 10 ms on a condition that the AG value is set to “inactive”,
determine whether an activation flag is set to “single” or “all” on a condition that the TTI is 2 ms, and
activate a corresponding H-ARQ process on a condition that the activation flag is set to “single.”

### Claim 39 (depends on 38)

The WTRU of claim 38 wherein the SG processor is configured to:
determine whether a secondary enhanced dedicated channel (E-DCH) radio network temporary identifier (E-RNTI) is configured on a condition that the activation flag is set to “all” or the TTI is 10 ms, and
deactivate all H-ARQ processes on a condition that the secondary E-RNTI is not configured.

### Claim 40 (depends on 39)

The WTRU of claim 39 wherein the SG processor is configured to:
set the SG based on the latest received AG value on a condition that the secondary E-RNTI is configured,
activate all H-ARQ processes, and
set the scheduling mode to a secondary AG mode.

### Claim 41 (depends on 39)

The WTRU of claim 39 wherein the SG processor is configured to:
maintain a current SG on a condition that the secondary E-RNTI is configured,
activate all H-ARQ processes, and
set the scheduling mode to a secondary AG mode.

### Claim 42 (depends on 35)

The WTRU of claim 35 wherein the SG processor is configured to:
determine whether the activation flag is set to “single” or “all”, on a condition that the AG value is set to “inactive”;
on a condition that the activation flag is set to “single”, determine whether a transmission time interval (TTI) is 2 ms or 10 ms; and
on a condition that the TTI is 2 ms, deactivate a corresponding hybrid automatic repeat request (H-ARQ) process.

### Claim 43 (depends on 42)

The WTRU of claim 42 wherein the SG processor is configured to:
determine whether a secondary enhanced dedicated channel (E-DCH) radio network temporary identifier (E-RNTI) is configured on a condition that the activation flag is set to “all”,
on a condition that the secondary E-RNTI is not configured, determine whether the TTI is 2 ms or 10 ms, and
on a condition that the TTI is 2 ms, deactivate all H-ARQ processes.

### Claim 44 (depends on 43)

The WTRU of claim 43 wherein the SG processor is configured to:
set the SG based on the latest received AG value on a condition that the secondary E-RNTI is configured,
activate all H-ARQ processes, and
set a scheduling mode to a secondary AG mode.

### Claim 45 (depends on 43)

The WTRU of claim 43 wherein the SG processor is configured to:
maintain the current SG on a condition that the secondary E-RNTI is configured,
activate all H-ARQ processes, and
set a scheduling mode to a secondary AG mode.