Apparatus and methods for reducing soft buffer size in mtc devices
AssigneeIntel IP Corporation
InventorsSEUNGHEE HAN, GANG XIONG
Life of this patent
Estimating the term…
Abstract
A machine type communication (MTC) device is configured to communicate through a long term evolution (LTE) network. The MTC device include a wireless transceiver to receive a signal through the LTE network, a soft buffer configured to store a plurality of soft channel bits for up to a maximum number of hybrid automatic retransmission request (HARQ) processes, and a signal processing unit. The signal processing unit is configured to determine a total number of soft channel bits based at least on the maximum number of HARQ processes, and to use limited buffer rate matching (LBRM) to store a reduced number of the total number of soft channel bits in the soft buffer.
Claims21
A machine type communication (MTC) device configured to communicate through a long term evolution (LTE) network, the MTC device comprising:
- a wireless transceiver to receive a signal through the LTE network;
- a soft buffer configured to store a plurality of soft channel bits for up to a maximum number of hybrid automatic retransmission request (HARQ) processes;
- and
- a signal processing unit to:
- determine a total number of soft channel bits based on the maximum number of HARQ processes, a subblock interleave size, a coding rate, and a number of code blocks;
- and
- store, with limited buffer rate matching (LBRM), a reduced number of the total number of soft channel bits in the soft buffer.
A method comprising:
- receiving a wireless signal corresponding to machine type communication;
- demodulating the wireless signal to generate a plurality of received log-likelihood ratios (LLRs) corresponding to a transport block;
- combining the received LLRs with a limited number of stored LLRs for the transport block from a previous wireless signal;
- decoding the combined LLRs;
- performing a cyclic redundancy check to determine that the decoding failed;
- in response to determining that the decoding failed, performing limited buffer rate matching to store only a limited number of the combined LLRs in a soft buffer, and requesting transmission of at least one additional wireless signal corresponding to the transport block.
A computer program product comprising a computer-readable storage medium storing program code for causing one or more processors to perform a method, the method comprising:
- establishing a connection with an evolved Node B (eNB) in a long term evolution (LTE) network;
- determining a maximum number of hybrid automatic retransmission request (HARQ) processes for full duplex frequency division duplexing with the eNB;
- determining a reduced number of HARQ processes for half duplex frequency division duplexing with the eNB;
- the number being less than the maximum number;
- determining a total number of soft channel bits based on the reduced number of HARQ processes;
- and
- storing a reduced number of the total number of soft channel bits in a soft buffer.
Dependencies are inferred from the claim text.