Carrier aggregation-based demodulation method and apparatus

Patent metadata

Field	Value
Publication number	US-11006437-B2
Application number	US-201916579412-A
Country	US
Kind code	B2
Filing date	Sep 23, 2019
Priority date	Mar 21, 2017
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

A method for carrier aggregation-based demodulation is provided, which includes: when uplink data sent by UE based on a scheduled SCC is received, if a current moment is a periodic CQI reporting moment and a first PCC scheduling result of the UE is not received when a demodulation format used for demodulating the uplink data needs to be determined before the current moment, demodulating the uplink data respectively based on a first demodulation format and a second demodulation format, to obtain a first demodulation result, a second demodulation result, a first check result, and a second check result; and if the first PCC scheduling result is already received when the demodulation is completed, determining, based on the first PCC scheduling result, the first demodulation result, the second demodulation result, the first check result, and the second check result, a demodulation result of correctly demodulating the uplink data.

First claim

What is claimed is:

1. A carrier aggregation-based demodulation method comprising:
determining, by a first base station, whether a current moment is a periodic channel quality indicator (COI) reporting moment in response to the first base station receiving uplink data sent by user equipment (UE) based on a scheduled secondary component carrier (SCC);
demodulating, by the first base station, the uplink data based on first and second demodulation formats to obtain first and second demodulation results, respectively, and first and second check results, respectively,
wherein the current moment is determined to be the periodic CQI reporting moment,
wherein the first base station has not received a first primary component carrier (PCC) scheduling result of the UE sent by a second base station, which the first base station needs to determine a demodulation format for demodulating the uplink data sent on the SCC before the current moment,
wherein the first PCC scheduling result indicates whether uplink scheduling is performed on a PCC of the UE at the periodic CQI reporting moment,
wherein the first demodulation format is a demodulation format used when there is periodic CQI channel associated signaling on a physical uplink shared channel (PUSCH) of the SCC,
wherein the second demodulation format is a demodulation format used when there is no periodic CQI channel associated signaling on the PUSCH of the SCC,
wherein the first check result is obtained by checking the first demodulation result in a cyclic redundancy check (CRC) manner, and
wherein the second check result is obtained by checking the second demodulation result in the CRC manner; and

determining, by the first base station, a correct demodulation result of demodulating the uplink data in response to the first base station already receiving the first PCC scheduling result sent by the second base station,
wherein the determination is based on the (i) first PCC scheduling result, (ii) the first and second demodulation results and (iii) the first and second check results.

2. The method according to claim 1 , wherein determining the correct demodulation result comprises:
determining the correct demodulation results based on the second demodulation result and the second check result in response to the first PCC scheduling result indicates that the uplink scheduling is performed on the PCC of the UE at the periodic CQI reporting moment.

3. The method according to claim 1 , further comprising:
determining, by the first base station and based on the first and second check results, whether there is a correct checked demodulation result between the first and second demodulation results in response to the first base station not receiving the first PCC scheduling result from the second base station when the demodulation is completed; and
determining, by the first base station, the correct checked demodulation result in response to correctly demodulating the uplink data on the SCC and the first base station determines the correct checked demodulation result between the first and second demodulation results.

4. The method according to claim 3 , further comprising:
determining, by the first base station, first and second demodulation data in response to the first base station determining there is no correct checked demodulation result in the first demodulation result and the second demodulation results,
wherein the first demodulation data is data on which hybrid automatic repeat request (HARQ) combination can be performed and is obtained in a process of demodulating the uplink data based on the first demodulation format, and
wherein the second demodulation data is data on which the HARQ combination can be performed and is obtained in a process of demodulating the uplink data based on the second demodulation format;

sending, by the first base station, an HARQ retransmission indication to the UE and waiting, by the first base station, to receive the first PCC scheduling result sent by the second base station,
wherein the HARQ retransmission indication instructs the UE to send HARQ retransmission data based on the SCC;
selecting, by the first base station, first target demodulation data from the first and second demodulation data based on the first PCC scheduling result in response to receiving the first PCC scheduling result sent by the second base station,
wherein the first target demodulation data is demodulation data in a correct demodulation format that is indicated by the first PCC scheduling result;

demodulating, by the first base station, the HARQ retransmission data based on the first and second demodulation formats and, obtaining from the demodulation, third and fourth demodulation data on which a HARQ combination can be performed in response to receiving the HARQ retransmission data sent by the UE;
performing, by the first base station, the HARQ combination on the third and fourth demodulation data with the first target demodulation data, and determining first and second combination demodulation results based on demodulation data obtained after the HARQ combination in response to the first base station not receiving, during the demodulation of the HARQ retransmission data, a second PCC scheduling result sent by the second base station,
wherein the second PCC scheduling result indicates whether uplink scheduling is performed on the PCC of the UE at an HARQ retransmission data moment;

checking, by the first base station, the first and second combination demodulation results in the CRC manner; and
re-sending an HARQ retransmission indication to the UE and waiting to receive a PCC scheduling result sent by the second base station until a quantity of times of sending the HARQ retransmission indication to the UE reaches a preset quantity in response to determining, through the check, that there is no correct checked demodulation result in the first and second combination demodulation results.

5. The method according to claim 4 , further comprising:
selecting, by the first base station, second target demodulation data from the third and fourth demodulation data based on the second PCC scheduling result in response to the first base station having already received, during the demodulation, the second PCC scheduling result sent by the second base station,
wherein the second target demodulation result is demodulation data in the correct demodulation format that is indicated by the second PCC scheduling result;

performing, by the first base station, the HARQ combination on the first and second target demodulation data, and determining a third combination demodulation result based on demodulation data obtained after the combination; and
determining, by the first base, the demodulation result of correctly demodulating the uplink data on the SCC based on the third combination demodulation result.

6. The method according to claim 4 , further comprising:
determining, by the first base station, that correct check demodulation result as the demodulation result of correctly demodulating the uplink in response to determining, through the check, a correct checked demodulation result in the first and second combination demodulation result.

7. The method according to claim 1 , wherein determining, based on the first PCC scheduling result, the first demodulation result, the second demodulation result, the first check result, and the second check result, the demodulation result of correctly demodulating the uplink data comprises:
in response to the first PCC scheduling result indicating that no uplink scheduling is performed on the PCC of the UE at the periodic CQI reporting moment, determining, based on the first demodulation result and the first check result, the demodulation result of correctly demodulating the up

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhang Qiuhua
• Xue Xulei
• Sun Jifeng

Classifications

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L1/004

  by using forward error control (H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00) · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title