Method for wireless communications testing using downlink and uplink transmissions between an access point and mobile terminals
View Patent ↗A method for wireless communications testing using downlink (DL) signal transmissions from an access point to a mobile terminal and uplink (UL) signal transmissions from said mobile terminal to said access point. Accurate block error rate (BLER) testing of LTE mobile devices in a wireless signal environment is enabled by preventing repeated transmissions of the same downlink (DL) data block that would normally follow reception of uplink (UL) transmissions of negative UL acknowledgments (NACKs) caused by failures to decode prior DL data transmissions, thereby producing cumulative NACK counts accurately reflecting data reception errors.
1. A method for wireless communications testing using downlink (DL) signal transmissions from an access point to a mobile terminal and uplink (UL) signal transmissions from said mobile terminal to said access point, comprising:
performing a portion of a plurality of DL signal transmissions including DL control information with a signal transmission control parameter related to a first maximum number of transmissions of each one of a plurality of successive DL data blocks in a subsequent portion of said plurality of DL signal transmissions;
performing said subsequent portion of said plurality of DL signal transmissions, wherein no transmission of any one of said plurality of successive DL data blocks exceeds said first maximum number;
performing each one of a plurality of UL signal transmissions responsive to a respective one of said subsequent portion of said plurality of DL signal transmissions and including
a positive UL acknowledgment (ACK) for each one of said plurality of successive DL data blocks that has been successfully decoded, and
a negative UL acknowledgment (NACK) for each one of said plurality of successive DL data blocks that has been unsuccessfully decoded; and
performing another portion of said plurality of DL signal transmissions including further DL control information with said signal transmission control parameter related to a second maximum number of transmissions of each one of another plurality of successive DL data blocks in another subsequent portion of said plurality of DL signal transmissions, wherein said second maximum number is greater than said first maximum number.
2. The method of claim 1 , further comprising performing said another subsequent portion of said plurality of DL signal transmissions, wherein transmissions of one or more of said another plurality of successive DL data blocks exceeds said first maximum number.
3. The method of claim 1 , wherein said first maximum number equals unity.
4. The method of claim 1 , wherein a ratio of a sum of said NACKs and a sum of said ACKs and NACKs defines a data block error rate.
5. The method of claim 1 , wherein:
said performing said portion and said subsequent portion of said plurality of DL signal transmissions comprises conveying said plurality of DL signal transmissions via a plurality of DL channels; and
said performing each one of said plurality of UL signal transmissions comprises conveying said plurality of UL signal transmissions via a plurality of UL channels.
6. A method for wireless communications testing using downlink (DL) signal transmissions from an access point to a mobile terminal and uplink (UL) signal transmissions from said mobile terminal to said access point, comprising:
performing a plurality of DL signal transmissions including a plurality of successive DL data blocks and a plurality of new data indicators (NDIs), wherein each one of said plurality of NDIs is
associated with a respective one of said plurality of successive DL data blocks, and
set to a value indicating that each subsequent one of said plurality of successive DL data blocks includes data different from a preceding one of said plurality of successive DL data blocks;
performing a plurality of UL signal transmissions responsive to said plurality of DL signal transmissions and including
a positive UL acknowledgment (ACK) for each one of said plurality of successive DL data blocks that has been successfully decoded, and
a negative UL acknowledgment (NACK) for each one of said plurality of successive DL data blocks that has been unsuccessfully decoded; and
performing another plurality of DL signal transmissions including another plurality of successive DL data blocks and another plurality of NDIs, wherein
each one of said another plurality of NDIs is associated with a respective one of said another plurality of successive DL data blocks,
each one of a portion of said another plurality of NDIs following a respective portion of said plurality of UL signal transmissions including an ACK is set to a value indicating that a subsequent one of said plurality of successive DL data blocks includes data different from a preceding one of said plurality of successive DL data blocks, and
each one of another portion of said another plurality of NDIs following a respective portion of said plurality of UL signal transmissions including a NACK is set to a value indicating that a subsequent one of said plurality of successive DL data blocks includes the same data as a preceding one of said plurality of successive DL data blocks.
7. The method of claim 6 , wherein a ratio of a sum of said NACKs and a sum of said ACKs and NACKs defines a data block error rate.
8. The method of claim 6 , wherein:
said performing said plurality of DL signal transmissions comprises conveying said plurality of DL signal transmissions via a plurality of DL channels; and
said performing said plurality of UL signal transmissions comprises conveying said plurality of UL signal transmissions via a plurality of UL channels.