Processing measurement gaps in a wireless communication system
In a wireless communication system, user equipment (UE) is provided, one or more set of rules are provided for the UE to handle the processing during a measurement gap. In some aspects, the gap measurement may be ignored. In some aspects, the processing is stored and handled at a later in time and gap measurements are performed. Depending on the system, the measurements performed during the gaps may be UE implementation dependent, wherein the UE determines whether to perform the measurement for a given gap. In some instances, the UE may not perform measurements during the gap, thereby giving priority to other processing, such as RACH processing. Depending on the type of processing required (DL-SCH, UL-SCH, TTI bundling, RACH or SR), the UE may store requests and process the measurements during the gap or ignore the gap measurement as if there were no gaps.
1. A method for processing a measurement gap, comprising:
receiving a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency;
determining a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap; and
performing a medium access control (MAC) process in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
2. The method of claim 1 , wherein:
the scheduling conflict arises from an end of the TTI bundle colliding with the measurement gap;
the portion of the TTI bundle that does not overlap with the measurement gap is a beginning portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding end portion of the TTI bundle; and
the MAC process further comprises:
using ACK/NAK feedback for a last intended TTI of the bundle, if an ACK/NAK is received, and
considering this bundle acknowledged if an ACK/NAK for the last intended TTI of the TTI bundle is not received and collides with the measurement gap.
3. The method of claim 1 , wherein:
the scheduling conflict arises from a beginning of the TTI bundle colliding with the measurement gap;
the portion of the TTI bundle that does not overlap with the measurement gap is an ending portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding beginning portion of the TTI bundle; and
the MAC process further comprises behaving in accordance with ACK/NAK feedback received for a last intended TTI of the bundle.
4. The method of claim 1 , wherein:
the scheduling conflict arises from the entire TTI bundle colliding with the measurement gap;
the colliding portion of the TTI bundle that overlaps with the measurement gap is the entire TTI bundle; and
the MAC process further comprises considering not acknowledged for the TTI bundle.
5. A computer program product for processing a measurement gap stored on a computer-readable storage medium and comprising code for causing at least one processor to:
receive a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency;
determine a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap; and
perform a medium access control (MAC) process in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
6. An apparatus for processing a measurement gap, comprising:
means for receiving a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency;
means for determining a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap; and
means for performing a medium access control (MAC) process in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
7. An apparatus for processing a measurement gap, comprising:
a receiver for receiving a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency;
a transmitter;
a memory; and
at least one processor coupled to said memory and configured to:
determine a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap, and
perform a medium access control (MAC) process via the transmitter and receiver in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
8. The apparatus of claim 7 , wherein:
the scheduling conflict arises from an end of the TTI bundle colliding with the measurement gap;
the portion of the TTI bundle that does not overlap with the measurement gap is a beginning portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding end portion of the TTI bundle; and
the MAC process further comprises using ACK/NAK feedback for a last intended TTI of the bundle, if an ACK/NAK is received, and considering this bundle acknowledged if an ACK/NAK for the last intended TTI of the TTI bundle is not received and collides with the measurement gap.
9. The apparatus of claim 7 , wherein:
the scheduling conflict arises from a beginning of the TTI bundle colliding with the measurement gap;
the portion of the TTI bundle that does not overlap with the measurement gap is an ending portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding beginning portion of the TTI bundle; and
the MAC process further comprises behaving in accordance with ACK/NAK feedback received for a last intended TTI of the bundle.
10. The apparatus of claim 7 , wherein:
the scheduling conflict arises from the entire TTI bundle colliding with the measurement gap;
the colliding portion of the TTI bundle that overlaps with the measurement gap is the entire TTI bundle; and
the MAC process further comprises considering not acknowledged for the TTI bundle.
11. A method for assigning a measurement gap, comprising:
transmitting a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency; and
enabling user equipment to:
determine a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap; and
perform a medium access control (MAC) process in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
12. The method of claim 11 , wherein:
the scheduling conflict arises from an end of the TTI bundle colliding with the measurement gap,
the portion of the TTI bundle that does not overlap with the measurement gap is a beginning portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding end portion of the TTI bundle; and
the MAC process further comprises using ACK/NAK feedback for a last intended TTI of the bundle, if an ACK/NAK is received, and considering this bundle acknowledged if an ACK/NAK for the last intended TTI of the TTI bundle is not received and collides with the measurement gap.
13. The method of claim 11 ,
the scheduling conflict arises from a beginning of the TTI bundle colliding with the measurement gap;
the portion of the TTI bundle that does not overlap with the measurement gap is an ending portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding beginning portion of the TTI bundle; and
the MAC process further comprises behaving in accordance with ACK/NAK feedback received for a last intended TTI of the bundle.
14. The method of claim 11 , wherein:
the scheduling conflict arises from the entire TTI bundle colliding with the measurement gap;
the colliding portion of the TTI bundle that overlaps with the measurement gap is the entire TTI bundle; and
the MAC process further comprises considering not acknowledged for the TTI bundle.
15. A computer program product for assigning a measurement gap stored on a computer-readable storage medium and comprising code for causing at least one processor to:
transmit a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency; and
enable user equipment to:
determine a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap; and
perform a medium access control (MAC) process in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
16. An apparatus for assigning a measurement gap, comprising:
means for transmitting a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency; and
means for enabling user equipment to:
determine a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap; and
perform a medium access control (MAC) process in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
17. An apparatus for assigning a measurement gap, comprising:
a transmitter for transmitting a radio resource control (RRC) assignment on a downlink for a measurement gap for tuning from a source carrier frequency to a target carrier frequency;
a receiver;
a memory; and
at least one processor coupled to said memory and configured for enabling user equipment via the transmitter and receiver to:
determine a scheduling conflict arising from a beginning portion of a transmission time interval (TTI) bundle colliding with the measurement gap, an end portion of a TTI bundle colliding with the measurement gap, or an entire TTI bundle colliding with the measurement gap; and
perform a medium access control (MAC) process in accordance with a protocol predefined for the scheduling conflict by transmitting a portion of the TTI bundle that does not overlap with the measurement gap and canceling the colliding portion.
18. The apparatus of claim 17 , wherein:
the scheduling conflict arises from an end of the TTI bundle colliding with the measurement gap;
the portion of the TTI bundle that does not overlap with the measurement gap is a beginning portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding end portion of the TTI bundle; and
the MAC process further comprises using ACK/NAK feedback for a last intended TTI of the bundle if an ACK/NAK is received, and considering this bundle acknowledged if an ACK/NAK for the last intended TTI of the TTI bundle is not received and collides with the measurement gap.
19. The apparatus of claim 17 , wherein:
the scheduling conflict arises from a beginning of the TTI bundle colliding with the measurement gap;
the portion of the TTI bundle that does not overlap with the measurement gap is an ending portion of the TTI bundle;
the colliding portion of the TTI bundle that overlaps with the measurement gap is a colliding beginning portion of the TTI bundle; and
the MAC process further comprises behaving in accordance with ACK/NAK feedback received for a last intended TTI of the bundle.
20. The apparatus of claim 17 , wherein:
the scheduling conflict arises from the entire TTI bundle colliding with the measurement gap;
the colliding portion of the TTI bundle that overlaps with the measurement gap is the entire TTI bundle; and
the MAC process further comprises considering not acknowledged for the TTI bundle.