Method for processing NDI in random access procedure and a method for transmitting and receiving a signal using the same
First Claim
1. A method for a user equipment (UE) to receive a downlink signal, the method comprising:
- receiving a first downlink control channel identified by a temporary cell identifier (Temporary C-RNTI) from a base station, the first downlink control channel comprising a first downlink assignment signal having a new data indicator (NDI) with a first value;
receiving a second downlink control channel identified by a cell identifier (C-RNTI) from the base station, the second downlink control channel comprising a second downlink assignment signal having the NDI with a second value;
determining if the NDI has been toggled compared to the NDI previously received from the base station, wherein the UE ignores the NDI with the first value received through the first downlink control channel identified by the temporary cell identifier (Temporary C-RNTI);
receiving the downlink signal; and
processing the received downlink signal based on the determining.
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Abstract
A method for a user equipment (UE) to receive a downlink signal, the method including receiving a first downlink control channel identified by a temporary cell identifier (Temporary C-RNTI) from a base station, the first downlink control channel including a first downlink assignment signal having a new data indicator (NDI) with a first value; receiving a second downlink control channel identified by a cell identifier (C-RNTI) from the base station, the second downlink control channel including a second downlink assignment signal having the NDI with a second value; and determining if the NDI has been toggled compared to the NDI previously received from the base station. Further, the UE ignores the NDI with the first value received through the first downlink control channel identified by the temporary cell identifier (Temporary C-RNTI). The method also includes receiving the downlink signal based on the determining.
20 Citations
8 Claims
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1. A method for a user equipment (UE) to receive a downlink signal, the method comprising:
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receiving a first downlink control channel identified by a temporary cell identifier (Temporary C-RNTI) from a base station, the first downlink control channel comprising a first downlink assignment signal having a new data indicator (NDI) with a first value; receiving a second downlink control channel identified by a cell identifier (C-RNTI) from the base station, the second downlink control channel comprising a second downlink assignment signal having the NDI with a second value; determining if the NDI has been toggled compared to the NDI previously received from the base station, wherein the UE ignores the NDI with the first value received through the first downlink control channel identified by the temporary cell identifier (Temporary C-RNTI); receiving the downlink signal; and processing the received downlink signal based on the determining. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A user equipment comprising:
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a physical layer module including a receiving module and a transmitting module, the receiving module for receiving a downlink control channel and a downlink shared channel, the downlink control channel including a new data indicator (NDI) toggled if a base station indicates new transmission; and a MAC layer module including a plurality of HARQ process modules, a plurality of buffers respectively corresponding to the plurality of HARQ process modules, and a single HARQ entity, the HARQ entity controlling the plurality of HARQ process modules to allow a specific one of the HARQ process modules to process the downlink control channel and the downlink shared channel received by the receiving module, wherein the HARQ entity or the specific HARQ process module compares an NDI bit value previously stored in a specific buffer corresponding to the specific HARQ process module with an NDI value received in correspondence with the specific HARQ process module to determine whether the downlink shared channel received by the receiving module comprises a retransmitted information from the base station depending on whether the NDI bit value has been toggled, and ignores the NDI received using a temporary cell identifier when the HARQ entity or the specific HARQ process module determines whether the NDI bit value has been toggled.
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Specification